SemaDeclCXX.cpp revision dc98cd0cdd2eee8290b624ef69c6d91ce626d85e
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 SourceLocation IdLoc, 1724 Expr *InitList, 1725 SourceLocation EllipsisLoc) { 1726 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1727 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1728} 1729 1730/// \brief Handle a C++ member initializer using parentheses syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 SourceLocation IdLoc, 1738 SourceLocation LParenLoc, 1739 Expr **Args, unsigned NumArgs, 1740 SourceLocation RParenLoc, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1744 RParenLoc), 1745 EllipsisLoc); 1746} 1747 1748namespace { 1749 1750// Callback to only accept typo corrections that can be a valid C++ member 1751// intializer: either a non-static field member or a base class. 1752class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1753 public: 1754 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1755 : ClassDecl(ClassDecl) {} 1756 1757 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1758 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1759 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1760 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1761 else 1762 return isa<TypeDecl>(ND); 1763 } 1764 return false; 1765 } 1766 1767 private: 1768 CXXRecordDecl *ClassDecl; 1769}; 1770 1771} 1772 1773/// \brief Handle a C++ member initializer. 1774MemInitResult 1775Sema::BuildMemInitializer(Decl *ConstructorD, 1776 Scope *S, 1777 CXXScopeSpec &SS, 1778 IdentifierInfo *MemberOrBase, 1779 ParsedType TemplateTypeTy, 1780 SourceLocation IdLoc, 1781 const MultiInitializer &Args, 1782 SourceLocation EllipsisLoc) { 1783 if (!ConstructorD) 1784 return true; 1785 1786 AdjustDeclIfTemplate(ConstructorD); 1787 1788 CXXConstructorDecl *Constructor 1789 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1790 if (!Constructor) { 1791 // The user wrote a constructor initializer on a function that is 1792 // not a C++ constructor. Ignore the error for now, because we may 1793 // have more member initializers coming; we'll diagnose it just 1794 // once in ActOnMemInitializers. 1795 return true; 1796 } 1797 1798 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1799 1800 // C++ [class.base.init]p2: 1801 // Names in a mem-initializer-id are looked up in the scope of the 1802 // constructor's class and, if not found in that scope, are looked 1803 // up in the scope containing the constructor's definition. 1804 // [Note: if the constructor's class contains a member with the 1805 // same name as a direct or virtual base class of the class, a 1806 // mem-initializer-id naming the member or base class and composed 1807 // of a single identifier refers to the class member. A 1808 // mem-initializer-id for the hidden base class may be specified 1809 // using a qualified name. ] 1810 if (!SS.getScopeRep() && !TemplateTypeTy) { 1811 // Look for a member, first. 1812 DeclContext::lookup_result Result 1813 = ClassDecl->lookup(MemberOrBase); 1814 if (Result.first != Result.second) { 1815 ValueDecl *Member; 1816 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1817 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1818 if (EllipsisLoc.isValid()) 1819 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1820 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1821 1822 return BuildMemberInitializer(Member, Args, IdLoc); 1823 } 1824 } 1825 } 1826 // It didn't name a member, so see if it names a class. 1827 QualType BaseType; 1828 TypeSourceInfo *TInfo = 0; 1829 1830 if (TemplateTypeTy) { 1831 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1832 } else { 1833 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1834 LookupParsedName(R, S, &SS); 1835 1836 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1837 if (!TyD) { 1838 if (R.isAmbiguous()) return true; 1839 1840 // We don't want access-control diagnostics here. 1841 R.suppressDiagnostics(); 1842 1843 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1844 bool NotUnknownSpecialization = false; 1845 DeclContext *DC = computeDeclContext(SS, false); 1846 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1847 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1848 1849 if (!NotUnknownSpecialization) { 1850 // When the scope specifier can refer to a member of an unknown 1851 // specialization, we take it as a type name. 1852 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1853 SS.getWithLocInContext(Context), 1854 *MemberOrBase, IdLoc); 1855 if (BaseType.isNull()) 1856 return true; 1857 1858 R.clear(); 1859 R.setLookupName(MemberOrBase); 1860 } 1861 } 1862 1863 // If no results were found, try to correct typos. 1864 TypoCorrection Corr; 1865 MemInitializerValidatorCCC Validator(ClassDecl); 1866 if (R.empty() && BaseType.isNull() && 1867 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1868 &Validator, ClassDecl))) { 1869 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1870 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1871 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1872 // We have found a non-static data member with a similar 1873 // name to what was typed; complain and initialize that 1874 // member. 1875 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1876 << MemberOrBase << true << CorrectedQuotedStr 1877 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1878 Diag(Member->getLocation(), diag::note_previous_decl) 1879 << CorrectedQuotedStr; 1880 1881 return BuildMemberInitializer(Member, Args, IdLoc); 1882 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1883 const CXXBaseSpecifier *DirectBaseSpec; 1884 const CXXBaseSpecifier *VirtualBaseSpec; 1885 if (FindBaseInitializer(*this, ClassDecl, 1886 Context.getTypeDeclType(Type), 1887 DirectBaseSpec, VirtualBaseSpec)) { 1888 // We have found a direct or virtual base class with a 1889 // similar name to what was typed; complain and initialize 1890 // that base class. 1891 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1892 << MemberOrBase << false << CorrectedQuotedStr 1893 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1894 1895 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1896 : VirtualBaseSpec; 1897 Diag(BaseSpec->getSourceRange().getBegin(), 1898 diag::note_base_class_specified_here) 1899 << BaseSpec->getType() 1900 << BaseSpec->getSourceRange(); 1901 1902 TyD = Type; 1903 } 1904 } 1905 } 1906 1907 if (!TyD && BaseType.isNull()) { 1908 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1909 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1910 return true; 1911 } 1912 } 1913 1914 if (BaseType.isNull()) { 1915 BaseType = Context.getTypeDeclType(TyD); 1916 if (SS.isSet()) { 1917 NestedNameSpecifier *Qualifier = 1918 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1919 1920 // FIXME: preserve source range information 1921 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1922 } 1923 } 1924 } 1925 1926 if (!TInfo) 1927 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1928 1929 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1930} 1931 1932/// Checks a member initializer expression for cases where reference (or 1933/// pointer) members are bound to by-value parameters (or their addresses). 1934static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1935 Expr *Init, 1936 SourceLocation IdLoc) { 1937 QualType MemberTy = Member->getType(); 1938 1939 // We only handle pointers and references currently. 1940 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1941 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1942 return; 1943 1944 const bool IsPointer = MemberTy->isPointerType(); 1945 if (IsPointer) { 1946 if (const UnaryOperator *Op 1947 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1948 // The only case we're worried about with pointers requires taking the 1949 // address. 1950 if (Op->getOpcode() != UO_AddrOf) 1951 return; 1952 1953 Init = Op->getSubExpr(); 1954 } else { 1955 // We only handle address-of expression initializers for pointers. 1956 return; 1957 } 1958 } 1959 1960 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1961 // Taking the address of a temporary will be diagnosed as a hard error. 1962 if (IsPointer) 1963 return; 1964 1965 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1966 << Member << Init->getSourceRange(); 1967 } else if (const DeclRefExpr *DRE 1968 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1969 // We only warn when referring to a non-reference parameter declaration. 1970 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1971 if (!Parameter || Parameter->getType()->isReferenceType()) 1972 return; 1973 1974 S.Diag(Init->getExprLoc(), 1975 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1976 : diag::warn_bind_ref_member_to_parameter) 1977 << Member << Parameter << Init->getSourceRange(); 1978 } else { 1979 // Other initializers are fine. 1980 return; 1981 } 1982 1983 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1984 << (unsigned)IsPointer; 1985} 1986 1987/// Checks an initializer expression for use of uninitialized fields, such as 1988/// containing the field that is being initialized. Returns true if there is an 1989/// uninitialized field was used an updates the SourceLocation parameter; false 1990/// otherwise. 1991static bool InitExprContainsUninitializedFields(const Stmt *S, 1992 const ValueDecl *LhsField, 1993 SourceLocation *L) { 1994 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1995 1996 if (isa<CallExpr>(S)) { 1997 // Do not descend into function calls or constructors, as the use 1998 // of an uninitialized field may be valid. One would have to inspect 1999 // the contents of the function/ctor to determine if it is safe or not. 2000 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2001 // may be safe, depending on what the function/ctor does. 2002 return false; 2003 } 2004 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2005 const NamedDecl *RhsField = ME->getMemberDecl(); 2006 2007 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2008 // The member expression points to a static data member. 2009 assert(VD->isStaticDataMember() && 2010 "Member points to non-static data member!"); 2011 (void)VD; 2012 return false; 2013 } 2014 2015 if (isa<EnumConstantDecl>(RhsField)) { 2016 // The member expression points to an enum. 2017 return false; 2018 } 2019 2020 if (RhsField == LhsField) { 2021 // Initializing a field with itself. Throw a warning. 2022 // But wait; there are exceptions! 2023 // Exception #1: The field may not belong to this record. 2024 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2025 const Expr *base = ME->getBase(); 2026 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2027 // Even though the field matches, it does not belong to this record. 2028 return false; 2029 } 2030 // None of the exceptions triggered; return true to indicate an 2031 // uninitialized field was used. 2032 *L = ME->getMemberLoc(); 2033 return true; 2034 } 2035 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2036 // sizeof/alignof doesn't reference contents, do not warn. 2037 return false; 2038 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2039 // address-of doesn't reference contents (the pointer may be dereferenced 2040 // in the same expression but it would be rare; and weird). 2041 if (UOE->getOpcode() == UO_AddrOf) 2042 return false; 2043 } 2044 for (Stmt::const_child_range it = S->children(); it; ++it) { 2045 if (!*it) { 2046 // An expression such as 'member(arg ?: "")' may trigger this. 2047 continue; 2048 } 2049 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2050 return true; 2051 } 2052 return false; 2053} 2054 2055MemInitResult 2056Sema::BuildMemberInitializer(ValueDecl *Member, 2057 const MultiInitializer &Args, 2058 SourceLocation IdLoc) { 2059 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2060 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2061 assert((DirectMember || IndirectMember) && 2062 "Member must be a FieldDecl or IndirectFieldDecl"); 2063 2064 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2065 return true; 2066 2067 if (Member->isInvalidDecl()) 2068 return true; 2069 2070 // Diagnose value-uses of fields to initialize themselves, e.g. 2071 // foo(foo) 2072 // where foo is not also a parameter to the constructor. 2073 // TODO: implement -Wuninitialized and fold this into that framework. 2074 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2075 I != E; ++I) { 2076 SourceLocation L; 2077 Expr *Arg = *I; 2078 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2079 Arg = DIE->getInit(); 2080 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2081 // FIXME: Return true in the case when other fields are used before being 2082 // uninitialized. For example, let this field be the i'th field. When 2083 // initializing the i'th field, throw a warning if any of the >= i'th 2084 // fields are used, as they are not yet initialized. 2085 // Right now we are only handling the case where the i'th field uses 2086 // itself in its initializer. 2087 Diag(L, diag::warn_field_is_uninit); 2088 } 2089 } 2090 2091 bool HasDependentArg = Args.isTypeDependent(); 2092 2093 Expr *Init; 2094 if (Member->getType()->isDependentType() || HasDependentArg) { 2095 // Can't check initialization for a member of dependent type or when 2096 // any of the arguments are type-dependent expressions. 2097 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2098 2099 DiscardCleanupsInEvaluationContext(); 2100 } else { 2101 // Initialize the member. 2102 InitializedEntity MemberEntity = 2103 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2104 : InitializedEntity::InitializeMember(IndirectMember, 0); 2105 InitializationKind Kind = 2106 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2107 Args.getEndLoc()); 2108 2109 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2110 if (MemberInit.isInvalid()) 2111 return true; 2112 2113 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2114 2115 // C++0x [class.base.init]p7: 2116 // The initialization of each base and member constitutes a 2117 // full-expression. 2118 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2119 if (MemberInit.isInvalid()) 2120 return true; 2121 2122 // If we are in a dependent context, template instantiation will 2123 // perform this type-checking again. Just save the arguments that we 2124 // received in a ParenListExpr. 2125 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2126 // of the information that we have about the member 2127 // initializer. However, deconstructing the ASTs is a dicey process, 2128 // and this approach is far more likely to get the corner cases right. 2129 if (CurContext->isDependentContext()) { 2130 Init = Args.CreateInitExpr(Context, 2131 Member->getType().getNonReferenceType()); 2132 } else { 2133 Init = MemberInit.get(); 2134 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2135 } 2136 } 2137 2138 if (DirectMember) { 2139 return new (Context) CXXCtorInitializer(Context, DirectMember, 2140 IdLoc, Args.getStartLoc(), 2141 Init, Args.getEndLoc()); 2142 } else { 2143 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2144 IdLoc, Args.getStartLoc(), 2145 Init, Args.getEndLoc()); 2146 } 2147} 2148 2149MemInitResult 2150Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2151 const MultiInitializer &Args, 2152 CXXRecordDecl *ClassDecl) { 2153 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2154 if (!LangOpts.CPlusPlus0x) 2155 return Diag(NameLoc, diag::err_delegating_ctor) 2156 << TInfo->getTypeLoc().getLocalSourceRange(); 2157 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2158 2159 // Initialize the object. 2160 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2161 QualType(ClassDecl->getTypeForDecl(), 0)); 2162 InitializationKind Kind = 2163 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2164 Args.getEndLoc()); 2165 2166 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2167 if (DelegationInit.isInvalid()) 2168 return true; 2169 2170 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2171 "Delegating constructor with no target?"); 2172 2173 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2174 2175 // C++0x [class.base.init]p7: 2176 // The initialization of each base and member constitutes a 2177 // full-expression. 2178 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2179 if (DelegationInit.isInvalid()) 2180 return true; 2181 2182 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2183 DelegationInit.takeAs<Expr>(), 2184 Args.getEndLoc()); 2185} 2186 2187MemInitResult 2188Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2189 const MultiInitializer &Args, 2190 CXXRecordDecl *ClassDecl, 2191 SourceLocation EllipsisLoc) { 2192 bool HasDependentArg = Args.isTypeDependent(); 2193 2194 SourceLocation BaseLoc 2195 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2196 2197 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2198 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2199 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2200 2201 // C++ [class.base.init]p2: 2202 // [...] Unless the mem-initializer-id names a nonstatic data 2203 // member of the constructor's class or a direct or virtual base 2204 // of that class, the mem-initializer is ill-formed. A 2205 // mem-initializer-list can initialize a base class using any 2206 // name that denotes that base class type. 2207 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2208 2209 if (EllipsisLoc.isValid()) { 2210 // This is a pack expansion. 2211 if (!BaseType->containsUnexpandedParameterPack()) { 2212 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2213 << SourceRange(BaseLoc, Args.getEndLoc()); 2214 2215 EllipsisLoc = SourceLocation(); 2216 } 2217 } else { 2218 // Check for any unexpanded parameter packs. 2219 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2220 return true; 2221 2222 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2223 return true; 2224 } 2225 2226 // Check for direct and virtual base classes. 2227 const CXXBaseSpecifier *DirectBaseSpec = 0; 2228 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2229 if (!Dependent) { 2230 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2231 BaseType)) 2232 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2233 2234 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2235 VirtualBaseSpec); 2236 2237 // C++ [base.class.init]p2: 2238 // Unless the mem-initializer-id names a nonstatic data member of the 2239 // constructor's class or a direct or virtual base of that class, the 2240 // mem-initializer is ill-formed. 2241 if (!DirectBaseSpec && !VirtualBaseSpec) { 2242 // If the class has any dependent bases, then it's possible that 2243 // one of those types will resolve to the same type as 2244 // BaseType. Therefore, just treat this as a dependent base 2245 // class initialization. FIXME: Should we try to check the 2246 // initialization anyway? It seems odd. 2247 if (ClassDecl->hasAnyDependentBases()) 2248 Dependent = true; 2249 else 2250 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2251 << BaseType << Context.getTypeDeclType(ClassDecl) 2252 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2253 } 2254 } 2255 2256 if (Dependent) { 2257 // Can't check initialization for a base of dependent type or when 2258 // any of the arguments are type-dependent expressions. 2259 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2260 2261 DiscardCleanupsInEvaluationContext(); 2262 2263 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2264 /*IsVirtual=*/false, 2265 Args.getStartLoc(), BaseInit, 2266 Args.getEndLoc(), EllipsisLoc); 2267 } 2268 2269 // C++ [base.class.init]p2: 2270 // If a mem-initializer-id is ambiguous because it designates both 2271 // a direct non-virtual base class and an inherited virtual base 2272 // class, the mem-initializer is ill-formed. 2273 if (DirectBaseSpec && VirtualBaseSpec) 2274 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2275 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2276 2277 CXXBaseSpecifier *BaseSpec 2278 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2279 if (!BaseSpec) 2280 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2281 2282 // Initialize the base. 2283 InitializedEntity BaseEntity = 2284 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2285 InitializationKind Kind = 2286 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2287 Args.getEndLoc()); 2288 2289 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2290 if (BaseInit.isInvalid()) 2291 return true; 2292 2293 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2294 2295 // C++0x [class.base.init]p7: 2296 // The initialization of each base and member constitutes a 2297 // full-expression. 2298 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2299 if (BaseInit.isInvalid()) 2300 return true; 2301 2302 // If we are in a dependent context, template instantiation will 2303 // perform this type-checking again. Just save the arguments that we 2304 // received in a ParenListExpr. 2305 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2306 // of the information that we have about the base 2307 // initializer. However, deconstructing the ASTs is a dicey process, 2308 // and this approach is far more likely to get the corner cases right. 2309 if (CurContext->isDependentContext()) 2310 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2311 2312 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2313 BaseSpec->isVirtual(), 2314 Args.getStartLoc(), 2315 BaseInit.takeAs<Expr>(), 2316 Args.getEndLoc(), EllipsisLoc); 2317} 2318 2319// Create a static_cast\<T&&>(expr). 2320static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2321 QualType ExprType = E->getType(); 2322 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2323 SourceLocation ExprLoc = E->getLocStart(); 2324 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2325 TargetType, ExprLoc); 2326 2327 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2328 SourceRange(ExprLoc, ExprLoc), 2329 E->getSourceRange()).take(); 2330} 2331 2332/// ImplicitInitializerKind - How an implicit base or member initializer should 2333/// initialize its base or member. 2334enum ImplicitInitializerKind { 2335 IIK_Default, 2336 IIK_Copy, 2337 IIK_Move 2338}; 2339 2340static bool 2341BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2342 ImplicitInitializerKind ImplicitInitKind, 2343 CXXBaseSpecifier *BaseSpec, 2344 bool IsInheritedVirtualBase, 2345 CXXCtorInitializer *&CXXBaseInit) { 2346 InitializedEntity InitEntity 2347 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2348 IsInheritedVirtualBase); 2349 2350 ExprResult BaseInit; 2351 2352 switch (ImplicitInitKind) { 2353 case IIK_Default: { 2354 InitializationKind InitKind 2355 = InitializationKind::CreateDefault(Constructor->getLocation()); 2356 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2357 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2358 MultiExprArg(SemaRef, 0, 0)); 2359 break; 2360 } 2361 2362 case IIK_Move: 2363 case IIK_Copy: { 2364 bool Moving = ImplicitInitKind == IIK_Move; 2365 ParmVarDecl *Param = Constructor->getParamDecl(0); 2366 QualType ParamType = Param->getType().getNonReferenceType(); 2367 2368 Expr *CopyCtorArg = 2369 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2370 Constructor->getLocation(), ParamType, 2371 VK_LValue, 0); 2372 2373 // Cast to the base class to avoid ambiguities. 2374 QualType ArgTy = 2375 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2376 ParamType.getQualifiers()); 2377 2378 if (Moving) { 2379 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2380 } 2381 2382 CXXCastPath BasePath; 2383 BasePath.push_back(BaseSpec); 2384 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2385 CK_UncheckedDerivedToBase, 2386 Moving ? VK_XValue : VK_LValue, 2387 &BasePath).take(); 2388 2389 InitializationKind InitKind 2390 = InitializationKind::CreateDirect(Constructor->getLocation(), 2391 SourceLocation(), SourceLocation()); 2392 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2393 &CopyCtorArg, 1); 2394 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2395 MultiExprArg(&CopyCtorArg, 1)); 2396 break; 2397 } 2398 } 2399 2400 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2401 if (BaseInit.isInvalid()) 2402 return true; 2403 2404 CXXBaseInit = 2405 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2406 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2407 SourceLocation()), 2408 BaseSpec->isVirtual(), 2409 SourceLocation(), 2410 BaseInit.takeAs<Expr>(), 2411 SourceLocation(), 2412 SourceLocation()); 2413 2414 return false; 2415} 2416 2417static bool RefersToRValueRef(Expr *MemRef) { 2418 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2419 return Referenced->getType()->isRValueReferenceType(); 2420} 2421 2422static bool 2423BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2424 ImplicitInitializerKind ImplicitInitKind, 2425 FieldDecl *Field, IndirectFieldDecl *Indirect, 2426 CXXCtorInitializer *&CXXMemberInit) { 2427 if (Field->isInvalidDecl()) 2428 return true; 2429 2430 SourceLocation Loc = Constructor->getLocation(); 2431 2432 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2433 bool Moving = ImplicitInitKind == IIK_Move; 2434 ParmVarDecl *Param = Constructor->getParamDecl(0); 2435 QualType ParamType = Param->getType().getNonReferenceType(); 2436 2437 // Suppress copying zero-width bitfields. 2438 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2439 return false; 2440 2441 Expr *MemberExprBase = 2442 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2443 Loc, ParamType, VK_LValue, 0); 2444 2445 if (Moving) { 2446 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2447 } 2448 2449 // Build a reference to this field within the parameter. 2450 CXXScopeSpec SS; 2451 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2452 Sema::LookupMemberName); 2453 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2454 : cast<ValueDecl>(Field), AS_public); 2455 MemberLookup.resolveKind(); 2456 ExprResult CtorArg 2457 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2458 ParamType, Loc, 2459 /*IsArrow=*/false, 2460 SS, 2461 /*FirstQualifierInScope=*/0, 2462 MemberLookup, 2463 /*TemplateArgs=*/0); 2464 if (CtorArg.isInvalid()) 2465 return true; 2466 2467 // C++11 [class.copy]p15: 2468 // - if a member m has rvalue reference type T&&, it is direct-initialized 2469 // with static_cast<T&&>(x.m); 2470 if (RefersToRValueRef(CtorArg.get())) { 2471 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2472 } 2473 2474 // When the field we are copying is an array, create index variables for 2475 // each dimension of the array. We use these index variables to subscript 2476 // the source array, and other clients (e.g., CodeGen) will perform the 2477 // necessary iteration with these index variables. 2478 SmallVector<VarDecl *, 4> IndexVariables; 2479 QualType BaseType = Field->getType(); 2480 QualType SizeType = SemaRef.Context.getSizeType(); 2481 bool InitializingArray = false; 2482 while (const ConstantArrayType *Array 2483 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2484 InitializingArray = true; 2485 // Create the iteration variable for this array index. 2486 IdentifierInfo *IterationVarName = 0; 2487 { 2488 llvm::SmallString<8> Str; 2489 llvm::raw_svector_ostream OS(Str); 2490 OS << "__i" << IndexVariables.size(); 2491 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2492 } 2493 VarDecl *IterationVar 2494 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2495 IterationVarName, SizeType, 2496 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2497 SC_None, SC_None); 2498 IndexVariables.push_back(IterationVar); 2499 2500 // Create a reference to the iteration variable. 2501 ExprResult IterationVarRef 2502 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2503 assert(!IterationVarRef.isInvalid() && 2504 "Reference to invented variable cannot fail!"); 2505 2506 // Subscript the array with this iteration variable. 2507 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2508 IterationVarRef.take(), 2509 Loc); 2510 if (CtorArg.isInvalid()) 2511 return true; 2512 2513 BaseType = Array->getElementType(); 2514 } 2515 2516 // The array subscript expression is an lvalue, which is wrong for moving. 2517 if (Moving && InitializingArray) 2518 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2519 2520 // Construct the entity that we will be initializing. For an array, this 2521 // will be first element in the array, which may require several levels 2522 // of array-subscript entities. 2523 SmallVector<InitializedEntity, 4> Entities; 2524 Entities.reserve(1 + IndexVariables.size()); 2525 if (Indirect) 2526 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2527 else 2528 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2529 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2530 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2531 0, 2532 Entities.back())); 2533 2534 // Direct-initialize to use the copy constructor. 2535 InitializationKind InitKind = 2536 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2537 2538 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2539 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2540 &CtorArgE, 1); 2541 2542 ExprResult MemberInit 2543 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2544 MultiExprArg(&CtorArgE, 1)); 2545 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2546 if (MemberInit.isInvalid()) 2547 return true; 2548 2549 if (Indirect) { 2550 assert(IndexVariables.size() == 0 && 2551 "Indirect field improperly initialized"); 2552 CXXMemberInit 2553 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2554 Loc, Loc, 2555 MemberInit.takeAs<Expr>(), 2556 Loc); 2557 } else 2558 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2559 Loc, MemberInit.takeAs<Expr>(), 2560 Loc, 2561 IndexVariables.data(), 2562 IndexVariables.size()); 2563 return false; 2564 } 2565 2566 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2567 2568 QualType FieldBaseElementType = 2569 SemaRef.Context.getBaseElementType(Field->getType()); 2570 2571 if (FieldBaseElementType->isRecordType()) { 2572 InitializedEntity InitEntity 2573 = Indirect? InitializedEntity::InitializeMember(Indirect) 2574 : InitializedEntity::InitializeMember(Field); 2575 InitializationKind InitKind = 2576 InitializationKind::CreateDefault(Loc); 2577 2578 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2579 ExprResult MemberInit = 2580 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2581 2582 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2583 if (MemberInit.isInvalid()) 2584 return true; 2585 2586 if (Indirect) 2587 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2588 Indirect, Loc, 2589 Loc, 2590 MemberInit.get(), 2591 Loc); 2592 else 2593 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2594 Field, Loc, Loc, 2595 MemberInit.get(), 2596 Loc); 2597 return false; 2598 } 2599 2600 if (!Field->getParent()->isUnion()) { 2601 if (FieldBaseElementType->isReferenceType()) { 2602 SemaRef.Diag(Constructor->getLocation(), 2603 diag::err_uninitialized_member_in_ctor) 2604 << (int)Constructor->isImplicit() 2605 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2606 << 0 << Field->getDeclName(); 2607 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2608 return true; 2609 } 2610 2611 if (FieldBaseElementType.isConstQualified()) { 2612 SemaRef.Diag(Constructor->getLocation(), 2613 diag::err_uninitialized_member_in_ctor) 2614 << (int)Constructor->isImplicit() 2615 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2616 << 1 << Field->getDeclName(); 2617 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2618 return true; 2619 } 2620 } 2621 2622 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2623 FieldBaseElementType->isObjCRetainableType() && 2624 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2625 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2626 // Instant objects: 2627 // Default-initialize Objective-C pointers to NULL. 2628 CXXMemberInit 2629 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2630 Loc, Loc, 2631 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2632 Loc); 2633 return false; 2634 } 2635 2636 // Nothing to initialize. 2637 CXXMemberInit = 0; 2638 return false; 2639} 2640 2641namespace { 2642struct BaseAndFieldInfo { 2643 Sema &S; 2644 CXXConstructorDecl *Ctor; 2645 bool AnyErrorsInInits; 2646 ImplicitInitializerKind IIK; 2647 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2648 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2649 2650 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2651 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2652 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2653 if (Generated && Ctor->isCopyConstructor()) 2654 IIK = IIK_Copy; 2655 else if (Generated && Ctor->isMoveConstructor()) 2656 IIK = IIK_Move; 2657 else 2658 IIK = IIK_Default; 2659 } 2660 2661 bool isImplicitCopyOrMove() const { 2662 switch (IIK) { 2663 case IIK_Copy: 2664 case IIK_Move: 2665 return true; 2666 2667 case IIK_Default: 2668 return false; 2669 } 2670 2671 return false; 2672 } 2673}; 2674} 2675 2676/// \brief Determine whether the given indirect field declaration is somewhere 2677/// within an anonymous union. 2678static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2679 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2680 CEnd = F->chain_end(); 2681 C != CEnd; ++C) 2682 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2683 if (Record->isUnion()) 2684 return true; 2685 2686 return false; 2687} 2688 2689/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2690/// array type. 2691static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2692 if (T->isIncompleteArrayType()) 2693 return true; 2694 2695 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2696 if (!ArrayT->getSize()) 2697 return true; 2698 2699 T = ArrayT->getElementType(); 2700 } 2701 2702 return false; 2703} 2704 2705static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2706 FieldDecl *Field, 2707 IndirectFieldDecl *Indirect = 0) { 2708 2709 // Overwhelmingly common case: we have a direct initializer for this field. 2710 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2711 Info.AllToInit.push_back(Init); 2712 return false; 2713 } 2714 2715 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2716 // has a brace-or-equal-initializer, the entity is initialized as specified 2717 // in [dcl.init]. 2718 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2719 CXXCtorInitializer *Init; 2720 if (Indirect) 2721 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2722 SourceLocation(), 2723 SourceLocation(), 0, 2724 SourceLocation()); 2725 else 2726 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2727 SourceLocation(), 2728 SourceLocation(), 0, 2729 SourceLocation()); 2730 Info.AllToInit.push_back(Init); 2731 return false; 2732 } 2733 2734 // Don't build an implicit initializer for union members if none was 2735 // explicitly specified. 2736 if (Field->getParent()->isUnion() || 2737 (Indirect && isWithinAnonymousUnion(Indirect))) 2738 return false; 2739 2740 // Don't initialize incomplete or zero-length arrays. 2741 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2742 return false; 2743 2744 // Don't try to build an implicit initializer if there were semantic 2745 // errors in any of the initializers (and therefore we might be 2746 // missing some that the user actually wrote). 2747 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2748 return false; 2749 2750 CXXCtorInitializer *Init = 0; 2751 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2752 Indirect, Init)) 2753 return true; 2754 2755 if (Init) 2756 Info.AllToInit.push_back(Init); 2757 2758 return false; 2759} 2760 2761bool 2762Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2763 CXXCtorInitializer *Initializer) { 2764 assert(Initializer->isDelegatingInitializer()); 2765 Constructor->setNumCtorInitializers(1); 2766 CXXCtorInitializer **initializer = 2767 new (Context) CXXCtorInitializer*[1]; 2768 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2769 Constructor->setCtorInitializers(initializer); 2770 2771 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2772 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2773 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2774 } 2775 2776 DelegatingCtorDecls.push_back(Constructor); 2777 2778 return false; 2779} 2780 2781bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2782 CXXCtorInitializer **Initializers, 2783 unsigned NumInitializers, 2784 bool AnyErrors) { 2785 if (Constructor->isDependentContext()) { 2786 // Just store the initializers as written, they will be checked during 2787 // instantiation. 2788 if (NumInitializers > 0) { 2789 Constructor->setNumCtorInitializers(NumInitializers); 2790 CXXCtorInitializer **baseOrMemberInitializers = 2791 new (Context) CXXCtorInitializer*[NumInitializers]; 2792 memcpy(baseOrMemberInitializers, Initializers, 2793 NumInitializers * sizeof(CXXCtorInitializer*)); 2794 Constructor->setCtorInitializers(baseOrMemberInitializers); 2795 } 2796 2797 return false; 2798 } 2799 2800 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2801 2802 // We need to build the initializer AST according to order of construction 2803 // and not what user specified in the Initializers list. 2804 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2805 if (!ClassDecl) 2806 return true; 2807 2808 bool HadError = false; 2809 2810 for (unsigned i = 0; i < NumInitializers; i++) { 2811 CXXCtorInitializer *Member = Initializers[i]; 2812 2813 if (Member->isBaseInitializer()) 2814 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2815 else 2816 Info.AllBaseFields[Member->getAnyMember()] = Member; 2817 } 2818 2819 // Keep track of the direct virtual bases. 2820 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2821 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2822 E = ClassDecl->bases_end(); I != E; ++I) { 2823 if (I->isVirtual()) 2824 DirectVBases.insert(I); 2825 } 2826 2827 // Push virtual bases before others. 2828 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2829 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2830 2831 if (CXXCtorInitializer *Value 2832 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2833 Info.AllToInit.push_back(Value); 2834 } else if (!AnyErrors) { 2835 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2836 CXXCtorInitializer *CXXBaseInit; 2837 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2838 VBase, IsInheritedVirtualBase, 2839 CXXBaseInit)) { 2840 HadError = true; 2841 continue; 2842 } 2843 2844 Info.AllToInit.push_back(CXXBaseInit); 2845 } 2846 } 2847 2848 // Non-virtual bases. 2849 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2850 E = ClassDecl->bases_end(); Base != E; ++Base) { 2851 // Virtuals are in the virtual base list and already constructed. 2852 if (Base->isVirtual()) 2853 continue; 2854 2855 if (CXXCtorInitializer *Value 2856 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2857 Info.AllToInit.push_back(Value); 2858 } else if (!AnyErrors) { 2859 CXXCtorInitializer *CXXBaseInit; 2860 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2861 Base, /*IsInheritedVirtualBase=*/false, 2862 CXXBaseInit)) { 2863 HadError = true; 2864 continue; 2865 } 2866 2867 Info.AllToInit.push_back(CXXBaseInit); 2868 } 2869 } 2870 2871 // Fields. 2872 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2873 MemEnd = ClassDecl->decls_end(); 2874 Mem != MemEnd; ++Mem) { 2875 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2876 // C++ [class.bit]p2: 2877 // A declaration for a bit-field that omits the identifier declares an 2878 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2879 // initialized. 2880 if (F->isUnnamedBitfield()) 2881 continue; 2882 2883 // If we're not generating the implicit copy/move constructor, then we'll 2884 // handle anonymous struct/union fields based on their individual 2885 // indirect fields. 2886 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2887 continue; 2888 2889 if (CollectFieldInitializer(*this, Info, F)) 2890 HadError = true; 2891 continue; 2892 } 2893 2894 // Beyond this point, we only consider default initialization. 2895 if (Info.IIK != IIK_Default) 2896 continue; 2897 2898 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2899 if (F->getType()->isIncompleteArrayType()) { 2900 assert(ClassDecl->hasFlexibleArrayMember() && 2901 "Incomplete array type is not valid"); 2902 continue; 2903 } 2904 2905 // Initialize each field of an anonymous struct individually. 2906 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2907 HadError = true; 2908 2909 continue; 2910 } 2911 } 2912 2913 NumInitializers = Info.AllToInit.size(); 2914 if (NumInitializers > 0) { 2915 Constructor->setNumCtorInitializers(NumInitializers); 2916 CXXCtorInitializer **baseOrMemberInitializers = 2917 new (Context) CXXCtorInitializer*[NumInitializers]; 2918 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2919 NumInitializers * sizeof(CXXCtorInitializer*)); 2920 Constructor->setCtorInitializers(baseOrMemberInitializers); 2921 2922 // Constructors implicitly reference the base and member 2923 // destructors. 2924 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2925 Constructor->getParent()); 2926 } 2927 2928 return HadError; 2929} 2930 2931static void *GetKeyForTopLevelField(FieldDecl *Field) { 2932 // For anonymous unions, use the class declaration as the key. 2933 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2934 if (RT->getDecl()->isAnonymousStructOrUnion()) 2935 return static_cast<void *>(RT->getDecl()); 2936 } 2937 return static_cast<void *>(Field); 2938} 2939 2940static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2941 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2942} 2943 2944static void *GetKeyForMember(ASTContext &Context, 2945 CXXCtorInitializer *Member) { 2946 if (!Member->isAnyMemberInitializer()) 2947 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2948 2949 // For fields injected into the class via declaration of an anonymous union, 2950 // use its anonymous union class declaration as the unique key. 2951 FieldDecl *Field = Member->getAnyMember(); 2952 2953 // If the field is a member of an anonymous struct or union, our key 2954 // is the anonymous record decl that's a direct child of the class. 2955 RecordDecl *RD = Field->getParent(); 2956 if (RD->isAnonymousStructOrUnion()) { 2957 while (true) { 2958 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2959 if (Parent->isAnonymousStructOrUnion()) 2960 RD = Parent; 2961 else 2962 break; 2963 } 2964 2965 return static_cast<void *>(RD); 2966 } 2967 2968 return static_cast<void *>(Field); 2969} 2970 2971static void 2972DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2973 const CXXConstructorDecl *Constructor, 2974 CXXCtorInitializer **Inits, 2975 unsigned NumInits) { 2976 if (Constructor->getDeclContext()->isDependentContext()) 2977 return; 2978 2979 // Don't check initializers order unless the warning is enabled at the 2980 // location of at least one initializer. 2981 bool ShouldCheckOrder = false; 2982 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2983 CXXCtorInitializer *Init = Inits[InitIndex]; 2984 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2985 Init->getSourceLocation()) 2986 != DiagnosticsEngine::Ignored) { 2987 ShouldCheckOrder = true; 2988 break; 2989 } 2990 } 2991 if (!ShouldCheckOrder) 2992 return; 2993 2994 // Build the list of bases and members in the order that they'll 2995 // actually be initialized. The explicit initializers should be in 2996 // this same order but may be missing things. 2997 SmallVector<const void*, 32> IdealInitKeys; 2998 2999 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3000 3001 // 1. Virtual bases. 3002 for (CXXRecordDecl::base_class_const_iterator VBase = 3003 ClassDecl->vbases_begin(), 3004 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3005 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3006 3007 // 2. Non-virtual bases. 3008 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3009 E = ClassDecl->bases_end(); Base != E; ++Base) { 3010 if (Base->isVirtual()) 3011 continue; 3012 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3013 } 3014 3015 // 3. Direct fields. 3016 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3017 E = ClassDecl->field_end(); Field != E; ++Field) { 3018 if (Field->isUnnamedBitfield()) 3019 continue; 3020 3021 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3022 } 3023 3024 unsigned NumIdealInits = IdealInitKeys.size(); 3025 unsigned IdealIndex = 0; 3026 3027 CXXCtorInitializer *PrevInit = 0; 3028 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3029 CXXCtorInitializer *Init = Inits[InitIndex]; 3030 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3031 3032 // Scan forward to try to find this initializer in the idealized 3033 // initializers list. 3034 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3035 if (InitKey == IdealInitKeys[IdealIndex]) 3036 break; 3037 3038 // If we didn't find this initializer, it must be because we 3039 // scanned past it on a previous iteration. That can only 3040 // happen if we're out of order; emit a warning. 3041 if (IdealIndex == NumIdealInits && PrevInit) { 3042 Sema::SemaDiagnosticBuilder D = 3043 SemaRef.Diag(PrevInit->getSourceLocation(), 3044 diag::warn_initializer_out_of_order); 3045 3046 if (PrevInit->isAnyMemberInitializer()) 3047 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3048 else 3049 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3050 3051 if (Init->isAnyMemberInitializer()) 3052 D << 0 << Init->getAnyMember()->getDeclName(); 3053 else 3054 D << 1 << Init->getTypeSourceInfo()->getType(); 3055 3056 // Move back to the initializer's location in the ideal list. 3057 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3058 if (InitKey == IdealInitKeys[IdealIndex]) 3059 break; 3060 3061 assert(IdealIndex != NumIdealInits && 3062 "initializer not found in initializer list"); 3063 } 3064 3065 PrevInit = Init; 3066 } 3067} 3068 3069namespace { 3070bool CheckRedundantInit(Sema &S, 3071 CXXCtorInitializer *Init, 3072 CXXCtorInitializer *&PrevInit) { 3073 if (!PrevInit) { 3074 PrevInit = Init; 3075 return false; 3076 } 3077 3078 if (FieldDecl *Field = Init->getMember()) 3079 S.Diag(Init->getSourceLocation(), 3080 diag::err_multiple_mem_initialization) 3081 << Field->getDeclName() 3082 << Init->getSourceRange(); 3083 else { 3084 const Type *BaseClass = Init->getBaseClass(); 3085 assert(BaseClass && "neither field nor base"); 3086 S.Diag(Init->getSourceLocation(), 3087 diag::err_multiple_base_initialization) 3088 << QualType(BaseClass, 0) 3089 << Init->getSourceRange(); 3090 } 3091 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3092 << 0 << PrevInit->getSourceRange(); 3093 3094 return true; 3095} 3096 3097typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3098typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3099 3100bool CheckRedundantUnionInit(Sema &S, 3101 CXXCtorInitializer *Init, 3102 RedundantUnionMap &Unions) { 3103 FieldDecl *Field = Init->getAnyMember(); 3104 RecordDecl *Parent = Field->getParent(); 3105 NamedDecl *Child = Field; 3106 3107 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3108 if (Parent->isUnion()) { 3109 UnionEntry &En = Unions[Parent]; 3110 if (En.first && En.first != Child) { 3111 S.Diag(Init->getSourceLocation(), 3112 diag::err_multiple_mem_union_initialization) 3113 << Field->getDeclName() 3114 << Init->getSourceRange(); 3115 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3116 << 0 << En.second->getSourceRange(); 3117 return true; 3118 } 3119 if (!En.first) { 3120 En.first = Child; 3121 En.second = Init; 3122 } 3123 if (!Parent->isAnonymousStructOrUnion()) 3124 return false; 3125 } 3126 3127 Child = Parent; 3128 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3129 } 3130 3131 return false; 3132} 3133} 3134 3135/// ActOnMemInitializers - Handle the member initializers for a constructor. 3136void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3137 SourceLocation ColonLoc, 3138 CXXCtorInitializer **meminits, 3139 unsigned NumMemInits, 3140 bool AnyErrors) { 3141 if (!ConstructorDecl) 3142 return; 3143 3144 AdjustDeclIfTemplate(ConstructorDecl); 3145 3146 CXXConstructorDecl *Constructor 3147 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3148 3149 if (!Constructor) { 3150 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3151 return; 3152 } 3153 3154 CXXCtorInitializer **MemInits = 3155 reinterpret_cast<CXXCtorInitializer **>(meminits); 3156 3157 // Mapping for the duplicate initializers check. 3158 // For member initializers, this is keyed with a FieldDecl*. 3159 // For base initializers, this is keyed with a Type*. 3160 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3161 3162 // Mapping for the inconsistent anonymous-union initializers check. 3163 RedundantUnionMap MemberUnions; 3164 3165 bool HadError = false; 3166 for (unsigned i = 0; i < NumMemInits; i++) { 3167 CXXCtorInitializer *Init = MemInits[i]; 3168 3169 // Set the source order index. 3170 Init->setSourceOrder(i); 3171 3172 if (Init->isAnyMemberInitializer()) { 3173 FieldDecl *Field = Init->getAnyMember(); 3174 if (CheckRedundantInit(*this, Init, Members[Field]) || 3175 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3176 HadError = true; 3177 } else if (Init->isBaseInitializer()) { 3178 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3179 if (CheckRedundantInit(*this, Init, Members[Key])) 3180 HadError = true; 3181 } else { 3182 assert(Init->isDelegatingInitializer()); 3183 // This must be the only initializer 3184 if (i != 0 || NumMemInits > 1) { 3185 Diag(MemInits[0]->getSourceLocation(), 3186 diag::err_delegating_initializer_alone) 3187 << MemInits[0]->getSourceRange(); 3188 HadError = true; 3189 // We will treat this as being the only initializer. 3190 } 3191 SetDelegatingInitializer(Constructor, MemInits[i]); 3192 // Return immediately as the initializer is set. 3193 return; 3194 } 3195 } 3196 3197 if (HadError) 3198 return; 3199 3200 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3201 3202 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3203} 3204 3205void 3206Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3207 CXXRecordDecl *ClassDecl) { 3208 // Ignore dependent contexts. Also ignore unions, since their members never 3209 // have destructors implicitly called. 3210 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3211 return; 3212 3213 // FIXME: all the access-control diagnostics are positioned on the 3214 // field/base declaration. That's probably good; that said, the 3215 // user might reasonably want to know why the destructor is being 3216 // emitted, and we currently don't say. 3217 3218 // Non-static data members. 3219 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3220 E = ClassDecl->field_end(); I != E; ++I) { 3221 FieldDecl *Field = *I; 3222 if (Field->isInvalidDecl()) 3223 continue; 3224 3225 // Don't destroy incomplete or zero-length arrays. 3226 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3227 continue; 3228 3229 QualType FieldType = Context.getBaseElementType(Field->getType()); 3230 3231 const RecordType* RT = FieldType->getAs<RecordType>(); 3232 if (!RT) 3233 continue; 3234 3235 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3236 if (FieldClassDecl->isInvalidDecl()) 3237 continue; 3238 if (FieldClassDecl->hasTrivialDestructor()) 3239 continue; 3240 3241 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3242 assert(Dtor && "No dtor found for FieldClassDecl!"); 3243 CheckDestructorAccess(Field->getLocation(), Dtor, 3244 PDiag(diag::err_access_dtor_field) 3245 << Field->getDeclName() 3246 << FieldType); 3247 3248 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3249 } 3250 3251 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3252 3253 // Bases. 3254 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3255 E = ClassDecl->bases_end(); Base != E; ++Base) { 3256 // Bases are always records in a well-formed non-dependent class. 3257 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3258 3259 // Remember direct virtual bases. 3260 if (Base->isVirtual()) 3261 DirectVirtualBases.insert(RT); 3262 3263 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3264 // If our base class is invalid, we probably can't get its dtor anyway. 3265 if (BaseClassDecl->isInvalidDecl()) 3266 continue; 3267 // Ignore trivial destructors. 3268 if (BaseClassDecl->hasTrivialDestructor()) 3269 continue; 3270 3271 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3272 assert(Dtor && "No dtor found for BaseClassDecl!"); 3273 3274 // FIXME: caret should be on the start of the class name 3275 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3276 PDiag(diag::err_access_dtor_base) 3277 << Base->getType() 3278 << Base->getSourceRange()); 3279 3280 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3281 } 3282 3283 // Virtual bases. 3284 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3285 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3286 3287 // Bases are always records in a well-formed non-dependent class. 3288 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3289 3290 // Ignore direct virtual bases. 3291 if (DirectVirtualBases.count(RT)) 3292 continue; 3293 3294 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3295 // If our base class is invalid, we probably can't get its dtor anyway. 3296 if (BaseClassDecl->isInvalidDecl()) 3297 continue; 3298 // Ignore trivial destructors. 3299 if (BaseClassDecl->hasTrivialDestructor()) 3300 continue; 3301 3302 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3303 assert(Dtor && "No dtor found for BaseClassDecl!"); 3304 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3305 PDiag(diag::err_access_dtor_vbase) 3306 << VBase->getType()); 3307 3308 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3309 } 3310} 3311 3312void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3313 if (!CDtorDecl) 3314 return; 3315 3316 if (CXXConstructorDecl *Constructor 3317 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3318 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3319} 3320 3321bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3322 unsigned DiagID, AbstractDiagSelID SelID) { 3323 if (SelID == -1) 3324 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3325 else 3326 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3327} 3328 3329bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3330 const PartialDiagnostic &PD) { 3331 if (!getLangOptions().CPlusPlus) 3332 return false; 3333 3334 if (const ArrayType *AT = Context.getAsArrayType(T)) 3335 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3336 3337 if (const PointerType *PT = T->getAs<PointerType>()) { 3338 // Find the innermost pointer type. 3339 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3340 PT = T; 3341 3342 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3343 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3344 } 3345 3346 const RecordType *RT = T->getAs<RecordType>(); 3347 if (!RT) 3348 return false; 3349 3350 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3351 3352 // We can't answer whether something is abstract until it has a 3353 // definition. If it's currently being defined, we'll walk back 3354 // over all the declarations when we have a full definition. 3355 const CXXRecordDecl *Def = RD->getDefinition(); 3356 if (!Def || Def->isBeingDefined()) 3357 return false; 3358 3359 if (!RD->isAbstract()) 3360 return false; 3361 3362 Diag(Loc, PD) << RD->getDeclName(); 3363 DiagnoseAbstractType(RD); 3364 3365 return true; 3366} 3367 3368void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3369 // Check if we've already emitted the list of pure virtual functions 3370 // for this class. 3371 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3372 return; 3373 3374 CXXFinalOverriderMap FinalOverriders; 3375 RD->getFinalOverriders(FinalOverriders); 3376 3377 // Keep a set of seen pure methods so we won't diagnose the same method 3378 // more than once. 3379 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3380 3381 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3382 MEnd = FinalOverriders.end(); 3383 M != MEnd; 3384 ++M) { 3385 for (OverridingMethods::iterator SO = M->second.begin(), 3386 SOEnd = M->second.end(); 3387 SO != SOEnd; ++SO) { 3388 // C++ [class.abstract]p4: 3389 // A class is abstract if it contains or inherits at least one 3390 // pure virtual function for which the final overrider is pure 3391 // virtual. 3392 3393 // 3394 if (SO->second.size() != 1) 3395 continue; 3396 3397 if (!SO->second.front().Method->isPure()) 3398 continue; 3399 3400 if (!SeenPureMethods.insert(SO->second.front().Method)) 3401 continue; 3402 3403 Diag(SO->second.front().Method->getLocation(), 3404 diag::note_pure_virtual_function) 3405 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3406 } 3407 } 3408 3409 if (!PureVirtualClassDiagSet) 3410 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3411 PureVirtualClassDiagSet->insert(RD); 3412} 3413 3414namespace { 3415struct AbstractUsageInfo { 3416 Sema &S; 3417 CXXRecordDecl *Record; 3418 CanQualType AbstractType; 3419 bool Invalid; 3420 3421 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3422 : S(S), Record(Record), 3423 AbstractType(S.Context.getCanonicalType( 3424 S.Context.getTypeDeclType(Record))), 3425 Invalid(false) {} 3426 3427 void DiagnoseAbstractType() { 3428 if (Invalid) return; 3429 S.DiagnoseAbstractType(Record); 3430 Invalid = true; 3431 } 3432 3433 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3434}; 3435 3436struct CheckAbstractUsage { 3437 AbstractUsageInfo &Info; 3438 const NamedDecl *Ctx; 3439 3440 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3441 : Info(Info), Ctx(Ctx) {} 3442 3443 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3444 switch (TL.getTypeLocClass()) { 3445#define ABSTRACT_TYPELOC(CLASS, PARENT) 3446#define TYPELOC(CLASS, PARENT) \ 3447 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3448#include "clang/AST/TypeLocNodes.def" 3449 } 3450 } 3451 3452 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3453 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3454 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3455 if (!TL.getArg(I)) 3456 continue; 3457 3458 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3459 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3460 } 3461 } 3462 3463 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3464 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3465 } 3466 3467 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3468 // Visit the type parameters from a permissive context. 3469 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3470 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3471 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3472 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3473 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3474 // TODO: other template argument types? 3475 } 3476 } 3477 3478 // Visit pointee types from a permissive context. 3479#define CheckPolymorphic(Type) \ 3480 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3481 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3482 } 3483 CheckPolymorphic(PointerTypeLoc) 3484 CheckPolymorphic(ReferenceTypeLoc) 3485 CheckPolymorphic(MemberPointerTypeLoc) 3486 CheckPolymorphic(BlockPointerTypeLoc) 3487 CheckPolymorphic(AtomicTypeLoc) 3488 3489 /// Handle all the types we haven't given a more specific 3490 /// implementation for above. 3491 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3492 // Every other kind of type that we haven't called out already 3493 // that has an inner type is either (1) sugar or (2) contains that 3494 // inner type in some way as a subobject. 3495 if (TypeLoc Next = TL.getNextTypeLoc()) 3496 return Visit(Next, Sel); 3497 3498 // If there's no inner type and we're in a permissive context, 3499 // don't diagnose. 3500 if (Sel == Sema::AbstractNone) return; 3501 3502 // Check whether the type matches the abstract type. 3503 QualType T = TL.getType(); 3504 if (T->isArrayType()) { 3505 Sel = Sema::AbstractArrayType; 3506 T = Info.S.Context.getBaseElementType(T); 3507 } 3508 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3509 if (CT != Info.AbstractType) return; 3510 3511 // It matched; do some magic. 3512 if (Sel == Sema::AbstractArrayType) { 3513 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3514 << T << TL.getSourceRange(); 3515 } else { 3516 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3517 << Sel << T << TL.getSourceRange(); 3518 } 3519 Info.DiagnoseAbstractType(); 3520 } 3521}; 3522 3523void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3524 Sema::AbstractDiagSelID Sel) { 3525 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3526} 3527 3528} 3529 3530/// Check for invalid uses of an abstract type in a method declaration. 3531static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3532 CXXMethodDecl *MD) { 3533 // No need to do the check on definitions, which require that 3534 // the return/param types be complete. 3535 if (MD->doesThisDeclarationHaveABody()) 3536 return; 3537 3538 // For safety's sake, just ignore it if we don't have type source 3539 // information. This should never happen for non-implicit methods, 3540 // but... 3541 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3542 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3543} 3544 3545/// Check for invalid uses of an abstract type within a class definition. 3546static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3547 CXXRecordDecl *RD) { 3548 for (CXXRecordDecl::decl_iterator 3549 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3550 Decl *D = *I; 3551 if (D->isImplicit()) continue; 3552 3553 // Methods and method templates. 3554 if (isa<CXXMethodDecl>(D)) { 3555 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3556 } else if (isa<FunctionTemplateDecl>(D)) { 3557 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3558 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3559 3560 // Fields and static variables. 3561 } else if (isa<FieldDecl>(D)) { 3562 FieldDecl *FD = cast<FieldDecl>(D); 3563 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3564 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3565 } else if (isa<VarDecl>(D)) { 3566 VarDecl *VD = cast<VarDecl>(D); 3567 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3568 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3569 3570 // Nested classes and class templates. 3571 } else if (isa<CXXRecordDecl>(D)) { 3572 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3573 } else if (isa<ClassTemplateDecl>(D)) { 3574 CheckAbstractClassUsage(Info, 3575 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3576 } 3577 } 3578} 3579 3580/// \brief Perform semantic checks on a class definition that has been 3581/// completing, introducing implicitly-declared members, checking for 3582/// abstract types, etc. 3583void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3584 if (!Record) 3585 return; 3586 3587 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3588 AbstractUsageInfo Info(*this, Record); 3589 CheckAbstractClassUsage(Info, Record); 3590 } 3591 3592 // If this is not an aggregate type and has no user-declared constructor, 3593 // complain about any non-static data members of reference or const scalar 3594 // type, since they will never get initializers. 3595 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3596 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3597 bool Complained = false; 3598 for (RecordDecl::field_iterator F = Record->field_begin(), 3599 FEnd = Record->field_end(); 3600 F != FEnd; ++F) { 3601 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3602 continue; 3603 3604 if (F->getType()->isReferenceType() || 3605 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3606 if (!Complained) { 3607 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3608 << Record->getTagKind() << Record; 3609 Complained = true; 3610 } 3611 3612 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3613 << F->getType()->isReferenceType() 3614 << F->getDeclName(); 3615 } 3616 } 3617 } 3618 3619 if (Record->isDynamicClass() && !Record->isDependentType()) 3620 DynamicClasses.push_back(Record); 3621 3622 if (Record->getIdentifier()) { 3623 // C++ [class.mem]p13: 3624 // If T is the name of a class, then each of the following shall have a 3625 // name different from T: 3626 // - every member of every anonymous union that is a member of class T. 3627 // 3628 // C++ [class.mem]p14: 3629 // In addition, if class T has a user-declared constructor (12.1), every 3630 // non-static data member of class T shall have a name different from T. 3631 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3632 R.first != R.second; ++R.first) { 3633 NamedDecl *D = *R.first; 3634 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3635 isa<IndirectFieldDecl>(D)) { 3636 Diag(D->getLocation(), diag::err_member_name_of_class) 3637 << D->getDeclName(); 3638 break; 3639 } 3640 } 3641 } 3642 3643 // Warn if the class has virtual methods but non-virtual public destructor. 3644 if (Record->isPolymorphic() && !Record->isDependentType()) { 3645 CXXDestructorDecl *dtor = Record->getDestructor(); 3646 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3647 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3648 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3649 } 3650 3651 // See if a method overloads virtual methods in a base 3652 /// class without overriding any. 3653 if (!Record->isDependentType()) { 3654 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3655 MEnd = Record->method_end(); 3656 M != MEnd; ++M) { 3657 if (!(*M)->isStatic()) 3658 DiagnoseHiddenVirtualMethods(Record, *M); 3659 } 3660 } 3661 3662 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3663 // function that is not a constructor declares that member function to be 3664 // const. [...] The class of which that function is a member shall be 3665 // a literal type. 3666 // 3667 // It's fine to diagnose constructors here too: such constructors cannot 3668 // produce a constant expression, so are ill-formed (no diagnostic required). 3669 // 3670 // If the class has virtual bases, any constexpr members will already have 3671 // been diagnosed by the checks performed on the member declaration, so 3672 // suppress this (less useful) diagnostic. 3673 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3674 !Record->isLiteral() && !Record->getNumVBases()) { 3675 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3676 MEnd = Record->method_end(); 3677 M != MEnd; ++M) { 3678 if ((*M)->isConstexpr()) { 3679 switch (Record->getTemplateSpecializationKind()) { 3680 case TSK_ImplicitInstantiation: 3681 case TSK_ExplicitInstantiationDeclaration: 3682 case TSK_ExplicitInstantiationDefinition: 3683 // If a template instantiates to a non-literal type, but its members 3684 // instantiate to constexpr functions, the template is technically 3685 // ill-formed, but we allow it for sanity. Such members are treated as 3686 // non-constexpr. 3687 (*M)->setConstexpr(false); 3688 continue; 3689 3690 case TSK_Undeclared: 3691 case TSK_ExplicitSpecialization: 3692 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3693 PDiag(diag::err_constexpr_method_non_literal)); 3694 break; 3695 } 3696 3697 // Only produce one error per class. 3698 break; 3699 } 3700 } 3701 } 3702 3703 // Declare inherited constructors. We do this eagerly here because: 3704 // - The standard requires an eager diagnostic for conflicting inherited 3705 // constructors from different classes. 3706 // - The lazy declaration of the other implicit constructors is so as to not 3707 // waste space and performance on classes that are not meant to be 3708 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3709 // have inherited constructors. 3710 DeclareInheritedConstructors(Record); 3711 3712 if (!Record->isDependentType()) 3713 CheckExplicitlyDefaultedMethods(Record); 3714} 3715 3716void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3717 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3718 ME = Record->method_end(); 3719 MI != ME; ++MI) { 3720 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3721 switch (getSpecialMember(*MI)) { 3722 case CXXDefaultConstructor: 3723 CheckExplicitlyDefaultedDefaultConstructor( 3724 cast<CXXConstructorDecl>(*MI)); 3725 break; 3726 3727 case CXXDestructor: 3728 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3729 break; 3730 3731 case CXXCopyConstructor: 3732 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3733 break; 3734 3735 case CXXCopyAssignment: 3736 CheckExplicitlyDefaultedCopyAssignment(*MI); 3737 break; 3738 3739 case CXXMoveConstructor: 3740 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3741 break; 3742 3743 case CXXMoveAssignment: 3744 CheckExplicitlyDefaultedMoveAssignment(*MI); 3745 break; 3746 3747 case CXXInvalid: 3748 llvm_unreachable("non-special member explicitly defaulted!"); 3749 } 3750 } 3751 } 3752 3753} 3754 3755void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3756 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3757 3758 // Whether this was the first-declared instance of the constructor. 3759 // This affects whether we implicitly add an exception spec (and, eventually, 3760 // constexpr). It is also ill-formed to explicitly default a constructor such 3761 // that it would be deleted. (C++0x [decl.fct.def.default]) 3762 bool First = CD == CD->getCanonicalDecl(); 3763 3764 bool HadError = false; 3765 if (CD->getNumParams() != 0) { 3766 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3767 << CD->getSourceRange(); 3768 HadError = true; 3769 } 3770 3771 ImplicitExceptionSpecification Spec 3772 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3773 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3774 if (EPI.ExceptionSpecType == EST_Delayed) { 3775 // Exception specification depends on some deferred part of the class. We'll 3776 // try again when the class's definition has been fully processed. 3777 return; 3778 } 3779 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3780 *ExceptionType = Context.getFunctionType( 3781 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3782 3783 // C++11 [dcl.fct.def.default]p2: 3784 // An explicitly-defaulted function may be declared constexpr only if it 3785 // would have been implicitly declared as constexpr, 3786 if (CD->isConstexpr()) { 3787 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3788 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3789 << CXXDefaultConstructor; 3790 HadError = true; 3791 } 3792 } 3793 // and may have an explicit exception-specification only if it is compatible 3794 // with the exception-specification on the implicit declaration. 3795 if (CtorType->hasExceptionSpec()) { 3796 if (CheckEquivalentExceptionSpec( 3797 PDiag(diag::err_incorrect_defaulted_exception_spec) 3798 << CXXDefaultConstructor, 3799 PDiag(), 3800 ExceptionType, SourceLocation(), 3801 CtorType, CD->getLocation())) { 3802 HadError = true; 3803 } 3804 } 3805 3806 // If a function is explicitly defaulted on its first declaration, 3807 if (First) { 3808 // -- it is implicitly considered to be constexpr if the implicit 3809 // definition would be, 3810 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3811 3812 // -- it is implicitly considered to have the same 3813 // exception-specification as if it had been implicitly declared 3814 // 3815 // FIXME: a compatible, but different, explicit exception specification 3816 // will be silently overridden. We should issue a warning if this happens. 3817 EPI.ExtInfo = CtorType->getExtInfo(); 3818 } 3819 3820 if (HadError) { 3821 CD->setInvalidDecl(); 3822 return; 3823 } 3824 3825 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3826 if (First) { 3827 CD->setDeletedAsWritten(); 3828 } else { 3829 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3830 << CXXDefaultConstructor; 3831 CD->setInvalidDecl(); 3832 } 3833 } 3834} 3835 3836void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3837 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3838 3839 // Whether this was the first-declared instance of the constructor. 3840 bool First = CD == CD->getCanonicalDecl(); 3841 3842 bool HadError = false; 3843 if (CD->getNumParams() != 1) { 3844 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3845 << CD->getSourceRange(); 3846 HadError = true; 3847 } 3848 3849 ImplicitExceptionSpecification Spec(Context); 3850 bool Const; 3851 llvm::tie(Spec, Const) = 3852 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3853 3854 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3855 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3856 *ExceptionType = Context.getFunctionType( 3857 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3858 3859 // Check for parameter type matching. 3860 // This is a copy ctor so we know it's a cv-qualified reference to T. 3861 QualType ArgType = CtorType->getArgType(0); 3862 if (ArgType->getPointeeType().isVolatileQualified()) { 3863 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3864 HadError = true; 3865 } 3866 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3867 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3868 HadError = true; 3869 } 3870 3871 // C++11 [dcl.fct.def.default]p2: 3872 // An explicitly-defaulted function may be declared constexpr only if it 3873 // would have been implicitly declared as constexpr, 3874 if (CD->isConstexpr()) { 3875 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3876 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3877 << CXXCopyConstructor; 3878 HadError = true; 3879 } 3880 } 3881 // and may have an explicit exception-specification only if it is compatible 3882 // with the exception-specification on the implicit declaration. 3883 if (CtorType->hasExceptionSpec()) { 3884 if (CheckEquivalentExceptionSpec( 3885 PDiag(diag::err_incorrect_defaulted_exception_spec) 3886 << CXXCopyConstructor, 3887 PDiag(), 3888 ExceptionType, SourceLocation(), 3889 CtorType, CD->getLocation())) { 3890 HadError = true; 3891 } 3892 } 3893 3894 // If a function is explicitly defaulted on its first declaration, 3895 if (First) { 3896 // -- it is implicitly considered to be constexpr if the implicit 3897 // definition would be, 3898 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3899 3900 // -- it is implicitly considered to have the same 3901 // exception-specification as if it had been implicitly declared, and 3902 // 3903 // FIXME: a compatible, but different, explicit exception specification 3904 // will be silently overridden. We should issue a warning if this happens. 3905 EPI.ExtInfo = CtorType->getExtInfo(); 3906 3907 // -- [...] it shall have the same parameter type as if it had been 3908 // implicitly declared. 3909 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3910 } 3911 3912 if (HadError) { 3913 CD->setInvalidDecl(); 3914 return; 3915 } 3916 3917 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3918 if (First) { 3919 CD->setDeletedAsWritten(); 3920 } else { 3921 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3922 << CXXCopyConstructor; 3923 CD->setInvalidDecl(); 3924 } 3925 } 3926} 3927 3928void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3929 assert(MD->isExplicitlyDefaulted()); 3930 3931 // Whether this was the first-declared instance of the operator 3932 bool First = MD == MD->getCanonicalDecl(); 3933 3934 bool HadError = false; 3935 if (MD->getNumParams() != 1) { 3936 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3937 << MD->getSourceRange(); 3938 HadError = true; 3939 } 3940 3941 QualType ReturnType = 3942 MD->getType()->getAs<FunctionType>()->getResultType(); 3943 if (!ReturnType->isLValueReferenceType() || 3944 !Context.hasSameType( 3945 Context.getCanonicalType(ReturnType->getPointeeType()), 3946 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3947 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3948 HadError = true; 3949 } 3950 3951 ImplicitExceptionSpecification Spec(Context); 3952 bool Const; 3953 llvm::tie(Spec, Const) = 3954 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3955 3956 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3957 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3958 *ExceptionType = Context.getFunctionType( 3959 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3960 3961 QualType ArgType = OperType->getArgType(0); 3962 if (!ArgType->isLValueReferenceType()) { 3963 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3964 HadError = true; 3965 } else { 3966 if (ArgType->getPointeeType().isVolatileQualified()) { 3967 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3968 HadError = true; 3969 } 3970 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3971 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3972 HadError = true; 3973 } 3974 } 3975 3976 if (OperType->getTypeQuals()) { 3977 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3978 HadError = true; 3979 } 3980 3981 if (OperType->hasExceptionSpec()) { 3982 if (CheckEquivalentExceptionSpec( 3983 PDiag(diag::err_incorrect_defaulted_exception_spec) 3984 << CXXCopyAssignment, 3985 PDiag(), 3986 ExceptionType, SourceLocation(), 3987 OperType, MD->getLocation())) { 3988 HadError = true; 3989 } 3990 } 3991 if (First) { 3992 // We set the declaration to have the computed exception spec here. 3993 // We duplicate the one parameter type. 3994 EPI.RefQualifier = OperType->getRefQualifier(); 3995 EPI.ExtInfo = OperType->getExtInfo(); 3996 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3997 } 3998 3999 if (HadError) { 4000 MD->setInvalidDecl(); 4001 return; 4002 } 4003 4004 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4005 if (First) { 4006 MD->setDeletedAsWritten(); 4007 } else { 4008 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4009 << CXXCopyAssignment; 4010 MD->setInvalidDecl(); 4011 } 4012 } 4013} 4014 4015void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4016 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4017 4018 // Whether this was the first-declared instance of the constructor. 4019 bool First = CD == CD->getCanonicalDecl(); 4020 4021 bool HadError = false; 4022 if (CD->getNumParams() != 1) { 4023 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4024 << CD->getSourceRange(); 4025 HadError = true; 4026 } 4027 4028 ImplicitExceptionSpecification Spec( 4029 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4030 4031 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4032 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4033 *ExceptionType = Context.getFunctionType( 4034 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4035 4036 // Check for parameter type matching. 4037 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4038 QualType ArgType = CtorType->getArgType(0); 4039 if (ArgType->getPointeeType().isVolatileQualified()) { 4040 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4041 HadError = true; 4042 } 4043 if (ArgType->getPointeeType().isConstQualified()) { 4044 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4045 HadError = true; 4046 } 4047 4048 // C++11 [dcl.fct.def.default]p2: 4049 // An explicitly-defaulted function may be declared constexpr only if it 4050 // would have been implicitly declared as constexpr, 4051 if (CD->isConstexpr()) { 4052 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4053 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4054 << CXXMoveConstructor; 4055 HadError = true; 4056 } 4057 } 4058 // and may have an explicit exception-specification only if it is compatible 4059 // with the exception-specification on the implicit declaration. 4060 if (CtorType->hasExceptionSpec()) { 4061 if (CheckEquivalentExceptionSpec( 4062 PDiag(diag::err_incorrect_defaulted_exception_spec) 4063 << CXXMoveConstructor, 4064 PDiag(), 4065 ExceptionType, SourceLocation(), 4066 CtorType, CD->getLocation())) { 4067 HadError = true; 4068 } 4069 } 4070 4071 // If a function is explicitly defaulted on its first declaration, 4072 if (First) { 4073 // -- it is implicitly considered to be constexpr if the implicit 4074 // definition would be, 4075 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4076 4077 // -- it is implicitly considered to have the same 4078 // exception-specification as if it had been implicitly declared, and 4079 // 4080 // FIXME: a compatible, but different, explicit exception specification 4081 // will be silently overridden. We should issue a warning if this happens. 4082 EPI.ExtInfo = CtorType->getExtInfo(); 4083 4084 // -- [...] it shall have the same parameter type as if it had been 4085 // implicitly declared. 4086 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4087 } 4088 4089 if (HadError) { 4090 CD->setInvalidDecl(); 4091 return; 4092 } 4093 4094 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4095 if (First) { 4096 CD->setDeletedAsWritten(); 4097 } else { 4098 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4099 << CXXMoveConstructor; 4100 CD->setInvalidDecl(); 4101 } 4102 } 4103} 4104 4105void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4106 assert(MD->isExplicitlyDefaulted()); 4107 4108 // Whether this was the first-declared instance of the operator 4109 bool First = MD == MD->getCanonicalDecl(); 4110 4111 bool HadError = false; 4112 if (MD->getNumParams() != 1) { 4113 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4114 << MD->getSourceRange(); 4115 HadError = true; 4116 } 4117 4118 QualType ReturnType = 4119 MD->getType()->getAs<FunctionType>()->getResultType(); 4120 if (!ReturnType->isLValueReferenceType() || 4121 !Context.hasSameType( 4122 Context.getCanonicalType(ReturnType->getPointeeType()), 4123 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4124 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4125 HadError = true; 4126 } 4127 4128 ImplicitExceptionSpecification Spec( 4129 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4130 4131 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4132 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4133 *ExceptionType = Context.getFunctionType( 4134 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4135 4136 QualType ArgType = OperType->getArgType(0); 4137 if (!ArgType->isRValueReferenceType()) { 4138 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4139 HadError = true; 4140 } else { 4141 if (ArgType->getPointeeType().isVolatileQualified()) { 4142 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4143 HadError = true; 4144 } 4145 if (ArgType->getPointeeType().isConstQualified()) { 4146 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4147 HadError = true; 4148 } 4149 } 4150 4151 if (OperType->getTypeQuals()) { 4152 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4153 HadError = true; 4154 } 4155 4156 if (OperType->hasExceptionSpec()) { 4157 if (CheckEquivalentExceptionSpec( 4158 PDiag(diag::err_incorrect_defaulted_exception_spec) 4159 << CXXMoveAssignment, 4160 PDiag(), 4161 ExceptionType, SourceLocation(), 4162 OperType, MD->getLocation())) { 4163 HadError = true; 4164 } 4165 } 4166 if (First) { 4167 // We set the declaration to have the computed exception spec here. 4168 // We duplicate the one parameter type. 4169 EPI.RefQualifier = OperType->getRefQualifier(); 4170 EPI.ExtInfo = OperType->getExtInfo(); 4171 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4172 } 4173 4174 if (HadError) { 4175 MD->setInvalidDecl(); 4176 return; 4177 } 4178 4179 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4180 if (First) { 4181 MD->setDeletedAsWritten(); 4182 } else { 4183 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4184 << CXXMoveAssignment; 4185 MD->setInvalidDecl(); 4186 } 4187 } 4188} 4189 4190void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4191 assert(DD->isExplicitlyDefaulted()); 4192 4193 // Whether this was the first-declared instance of the destructor. 4194 bool First = DD == DD->getCanonicalDecl(); 4195 4196 ImplicitExceptionSpecification Spec 4197 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4198 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4199 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4200 *ExceptionType = Context.getFunctionType( 4201 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4202 4203 if (DtorType->hasExceptionSpec()) { 4204 if (CheckEquivalentExceptionSpec( 4205 PDiag(diag::err_incorrect_defaulted_exception_spec) 4206 << CXXDestructor, 4207 PDiag(), 4208 ExceptionType, SourceLocation(), 4209 DtorType, DD->getLocation())) { 4210 DD->setInvalidDecl(); 4211 return; 4212 } 4213 } 4214 if (First) { 4215 // We set the declaration to have the computed exception spec here. 4216 // There are no parameters. 4217 EPI.ExtInfo = DtorType->getExtInfo(); 4218 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4219 } 4220 4221 if (ShouldDeleteDestructor(DD)) { 4222 if (First) { 4223 DD->setDeletedAsWritten(); 4224 } else { 4225 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4226 << CXXDestructor; 4227 DD->setInvalidDecl(); 4228 } 4229 } 4230} 4231 4232/// This function implements the following C++0x paragraphs: 4233/// - [class.ctor]/5 4234/// - [class.copy]/11 4235bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4236 assert(!MD->isInvalidDecl()); 4237 CXXRecordDecl *RD = MD->getParent(); 4238 assert(!RD->isDependentType() && "do deletion after instantiation"); 4239 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4240 return false; 4241 4242 bool IsUnion = RD->isUnion(); 4243 bool IsConstructor = false; 4244 bool IsAssignment = false; 4245 bool IsMove = false; 4246 4247 bool ConstArg = false; 4248 4249 switch (CSM) { 4250 case CXXDefaultConstructor: 4251 IsConstructor = true; 4252 break; 4253 case CXXCopyConstructor: 4254 IsConstructor = true; 4255 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4256 break; 4257 case CXXMoveConstructor: 4258 IsConstructor = true; 4259 IsMove = true; 4260 break; 4261 default: 4262 llvm_unreachable("function only currently implemented for default ctors"); 4263 } 4264 4265 SourceLocation Loc = MD->getLocation(); 4266 4267 // Do access control from the special member function 4268 ContextRAII MethodContext(*this, MD); 4269 4270 bool AllConst = true; 4271 4272 // We do this because we should never actually use an anonymous 4273 // union's constructor. 4274 if (IsUnion && RD->isAnonymousStructOrUnion()) 4275 return false; 4276 4277 // FIXME: We should put some diagnostic logic right into this function. 4278 4279 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4280 BE = RD->bases_end(); 4281 BI != BE; ++BI) { 4282 // We'll handle this one later 4283 if (BI->isVirtual()) 4284 continue; 4285 4286 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4287 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4288 4289 // Unless we have an assignment operator, the base's destructor must 4290 // be accessible and not deleted. 4291 if (!IsAssignment) { 4292 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4293 if (BaseDtor->isDeleted()) 4294 return true; 4295 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4296 AR_accessible) 4297 return true; 4298 } 4299 4300 // Finding the corresponding member in the base should lead to a 4301 // unique, accessible, non-deleted function. If we are doing 4302 // a destructor, we have already checked this case. 4303 if (CSM != CXXDestructor) { 4304 SpecialMemberOverloadResult *SMOR = 4305 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4306 false); 4307 if (!SMOR->hasSuccess()) 4308 return true; 4309 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4310 if (IsConstructor) { 4311 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4312 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4313 PDiag()) != AR_accessible) 4314 return true; 4315 4316 // For a move operation, the corresponding operation must actually 4317 // be a move operation (and not a copy selected by overload 4318 // resolution) unless we are working on a trivially copyable class. 4319 if (IsMove && !BaseCtor->isMoveConstructor() && 4320 !BaseDecl->isTriviallyCopyable()) 4321 return true; 4322 } 4323 } 4324 } 4325 4326 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4327 BE = RD->vbases_end(); 4328 BI != BE; ++BI) { 4329 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4330 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4331 4332 // Unless we have an assignment operator, the base's destructor must 4333 // be accessible and not deleted. 4334 if (!IsAssignment) { 4335 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4336 if (BaseDtor->isDeleted()) 4337 return true; 4338 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4339 AR_accessible) 4340 return true; 4341 } 4342 4343 // Finding the corresponding member in the base should lead to a 4344 // unique, accessible, non-deleted function. 4345 if (CSM != CXXDestructor) { 4346 SpecialMemberOverloadResult *SMOR = 4347 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4348 false); 4349 if (!SMOR->hasSuccess()) 4350 return true; 4351 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4352 if (IsConstructor) { 4353 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4354 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4355 PDiag()) != AR_accessible) 4356 return true; 4357 4358 // For a move operation, the corresponding operation must actually 4359 // be a move operation (and not a copy selected by overload 4360 // resolution) unless we are working on a trivially copyable class. 4361 if (IsMove && !BaseCtor->isMoveConstructor() && 4362 !BaseDecl->isTriviallyCopyable()) 4363 return true; 4364 } 4365 } 4366 } 4367 4368 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4369 FE = RD->field_end(); 4370 FI != FE; ++FI) { 4371 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4372 continue; 4373 4374 QualType FieldType = Context.getBaseElementType(FI->getType()); 4375 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4376 4377 // For a default constructor, all references must be initialized in-class 4378 // and, if a union, it must have a non-const member. 4379 if (CSM == CXXDefaultConstructor) { 4380 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4381 return true; 4382 4383 if (IsUnion && !FieldType.isConstQualified()) 4384 AllConst = false; 4385 // For a copy constructor, data members must not be of rvalue reference 4386 // type. 4387 } else if (CSM == CXXCopyConstructor) { 4388 if (FieldType->isRValueReferenceType()) 4389 return true; 4390 } 4391 4392 if (FieldRecord) { 4393 // For a default constructor, a const member must have a user-provided 4394 // default constructor or else be explicitly initialized. 4395 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4396 !FI->hasInClassInitializer() && 4397 !FieldRecord->hasUserProvidedDefaultConstructor()) 4398 return true; 4399 4400 // Some additional restrictions exist on the variant members. 4401 if (!IsUnion && FieldRecord->isUnion() && 4402 FieldRecord->isAnonymousStructOrUnion()) { 4403 // We're okay to reuse AllConst here since we only care about the 4404 // value otherwise if we're in a union. 4405 AllConst = true; 4406 4407 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4408 UE = FieldRecord->field_end(); 4409 UI != UE; ++UI) { 4410 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4411 CXXRecordDecl *UnionFieldRecord = 4412 UnionFieldType->getAsCXXRecordDecl(); 4413 4414 if (!UnionFieldType.isConstQualified()) 4415 AllConst = false; 4416 4417 if (UnionFieldRecord) { 4418 // FIXME: Checking for accessibility and validity of this 4419 // destructor is technically going beyond the 4420 // standard, but this is believed to be a defect. 4421 if (!IsAssignment) { 4422 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4423 if (FieldDtor->isDeleted()) 4424 return true; 4425 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4426 AR_accessible) 4427 return true; 4428 if (!FieldDtor->isTrivial()) 4429 return true; 4430 } 4431 4432 if (CSM != CXXDestructor) { 4433 SpecialMemberOverloadResult *SMOR = 4434 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4435 false, false, false); 4436 // FIXME: Checking for accessibility and validity of this 4437 // corresponding member is technically going beyond the 4438 // standard, but this is believed to be a defect. 4439 if (!SMOR->hasSuccess()) 4440 return true; 4441 4442 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4443 // A member of a union must have a trivial corresponding 4444 // constructor. 4445 if (!FieldMember->isTrivial()) 4446 return true; 4447 4448 if (IsConstructor) { 4449 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4450 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4451 PDiag()) != AR_accessible) 4452 return true; 4453 } 4454 } 4455 } 4456 } 4457 4458 // At least one member in each anonymous union must be non-const 4459 if (CSM == CXXDefaultConstructor && AllConst) 4460 return true; 4461 4462 // Don't try to initialize the anonymous union 4463 // This is technically non-conformant, but sanity demands it. 4464 continue; 4465 } 4466 4467 // Unless we're doing assignment, the field's destructor must be 4468 // accessible and not deleted. 4469 if (!IsAssignment) { 4470 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4471 if (FieldDtor->isDeleted()) 4472 return true; 4473 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4474 AR_accessible) 4475 return true; 4476 } 4477 4478 // Check that the corresponding member of the field is accessible, 4479 // unique, and non-deleted. We don't do this if it has an explicit 4480 // initialization when default-constructing. 4481 if (CSM != CXXDestructor && 4482 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4483 SpecialMemberOverloadResult *SMOR = 4484 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4485 false); 4486 if (!SMOR->hasSuccess()) 4487 return true; 4488 4489 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4490 if (IsConstructor) { 4491 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4492 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4493 PDiag()) != AR_accessible) 4494 return true; 4495 4496 // For a move operation, the corresponding operation must actually 4497 // be a move operation (and not a copy selected by overload 4498 // resolution) unless we are working on a trivially copyable class. 4499 if (IsMove && !FieldCtor->isMoveConstructor() && 4500 !FieldRecord->isTriviallyCopyable()) 4501 return true; 4502 } 4503 4504 // We need the corresponding member of a union to be trivial so that 4505 // we can safely copy them all simultaneously. 4506 // FIXME: Note that performing the check here (where we rely on the lack 4507 // of an in-class initializer) is technically ill-formed. However, this 4508 // seems most obviously to be a bug in the standard. 4509 if (IsUnion && !FieldMember->isTrivial()) 4510 return true; 4511 } 4512 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4513 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4514 // We can't initialize a const member of non-class type to any value. 4515 return true; 4516 } 4517 } 4518 4519 // We can't have all const members in a union when default-constructing, 4520 // or else they're all nonsensical garbage values that can't be changed. 4521 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4522 return true; 4523 4524 return false; 4525} 4526 4527bool Sema::ShouldDeleteCopyAssignmentOperator(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 unsigned ArgQuals = 4541 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4542 Qualifiers::Const : 0; 4543 4544 // We do this because we should never actually use an anonymous 4545 // union's constructor. 4546 if (Union && RD->isAnonymousStructOrUnion()) 4547 return false; 4548 4549 // FIXME: We should put some diagnostic logic right into this function. 4550 4551 // C++0x [class.copy]/20 4552 // A defaulted [copy] assignment operator for class X is defined as deleted 4553 // if X has: 4554 4555 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4556 BE = RD->bases_end(); 4557 BI != BE; ++BI) { 4558 // We'll handle this one later 4559 if (BI->isVirtual()) 4560 continue; 4561 4562 QualType BaseType = BI->getType(); 4563 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4564 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4565 4566 // -- a [direct base class] B that cannot be [copied] because overload 4567 // resolution, as applied to B's [copy] assignment operator, results in 4568 // an ambiguity or a function that is deleted or inaccessible from the 4569 // assignment operator 4570 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4571 0); 4572 if (!CopyOper || CopyOper->isDeleted()) 4573 return true; 4574 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4575 return true; 4576 } 4577 4578 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4579 BE = RD->vbases_end(); 4580 BI != BE; ++BI) { 4581 QualType BaseType = BI->getType(); 4582 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4583 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4584 4585 // -- a [virtual base class] B that cannot be [copied] because overload 4586 // resolution, as applied to B's [copy] assignment operator, results in 4587 // an ambiguity or a function that is deleted or inaccessible from the 4588 // assignment operator 4589 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4590 0); 4591 if (!CopyOper || CopyOper->isDeleted()) 4592 return true; 4593 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4594 return true; 4595 } 4596 4597 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4598 FE = RD->field_end(); 4599 FI != FE; ++FI) { 4600 if (FI->isUnnamedBitfield()) 4601 continue; 4602 4603 QualType FieldType = Context.getBaseElementType(FI->getType()); 4604 4605 // -- a non-static data member of reference type 4606 if (FieldType->isReferenceType()) 4607 return true; 4608 4609 // -- a non-static data member of const non-class type (or array thereof) 4610 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4611 return true; 4612 4613 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4614 4615 if (FieldRecord) { 4616 // This is an anonymous union 4617 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4618 // Anonymous unions inside unions do not variant members create 4619 if (!Union) { 4620 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4621 UE = FieldRecord->field_end(); 4622 UI != UE; ++UI) { 4623 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4624 CXXRecordDecl *UnionFieldRecord = 4625 UnionFieldType->getAsCXXRecordDecl(); 4626 4627 // -- a variant member with a non-trivial [copy] assignment operator 4628 // and X is a union-like class 4629 if (UnionFieldRecord && 4630 !UnionFieldRecord->hasTrivialCopyAssignment()) 4631 return true; 4632 } 4633 } 4634 4635 // Don't try to initalize an anonymous union 4636 continue; 4637 // -- a variant member with a non-trivial [copy] assignment operator 4638 // and X is a union-like class 4639 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4640 return true; 4641 } 4642 4643 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4644 false, 0); 4645 if (!CopyOper || CopyOper->isDeleted()) 4646 return true; 4647 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4648 return true; 4649 } 4650 } 4651 4652 return false; 4653} 4654 4655bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4656 CXXRecordDecl *RD = MD->getParent(); 4657 assert(!RD->isDependentType() && "do deletion after instantiation"); 4658 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4659 return false; 4660 4661 SourceLocation Loc = MD->getLocation(); 4662 4663 // Do access control from the constructor 4664 ContextRAII MethodContext(*this, MD); 4665 4666 bool Union = RD->isUnion(); 4667 4668 // We do this because we should never actually use an anonymous 4669 // union's constructor. 4670 if (Union && RD->isAnonymousStructOrUnion()) 4671 return false; 4672 4673 // C++0x [class.copy]/20 4674 // A defaulted [move] assignment operator for class X is defined as deleted 4675 // if X has: 4676 4677 // -- for the move constructor, [...] any direct or indirect virtual base 4678 // class. 4679 if (RD->getNumVBases() != 0) 4680 return true; 4681 4682 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4683 BE = RD->bases_end(); 4684 BI != BE; ++BI) { 4685 4686 QualType BaseType = BI->getType(); 4687 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4688 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4689 4690 // -- a [direct base class] B that cannot be [moved] because overload 4691 // resolution, as applied to B's [move] assignment operator, results in 4692 // an ambiguity or a function that is deleted or inaccessible from the 4693 // assignment operator 4694 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4695 if (!MoveOper || MoveOper->isDeleted()) 4696 return true; 4697 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4698 return true; 4699 4700 // -- for the move assignment operator, a [direct base class] with a type 4701 // that does not have a move assignment operator and is not trivially 4702 // copyable. 4703 if (!MoveOper->isMoveAssignmentOperator() && 4704 !BaseDecl->isTriviallyCopyable()) 4705 return true; 4706 } 4707 4708 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4709 FE = RD->field_end(); 4710 FI != FE; ++FI) { 4711 if (FI->isUnnamedBitfield()) 4712 continue; 4713 4714 QualType FieldType = Context.getBaseElementType(FI->getType()); 4715 4716 // -- a non-static data member of reference type 4717 if (FieldType->isReferenceType()) 4718 return true; 4719 4720 // -- a non-static data member of const non-class type (or array thereof) 4721 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4722 return true; 4723 4724 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4725 4726 if (FieldRecord) { 4727 // This is an anonymous union 4728 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4729 // Anonymous unions inside unions do not variant members create 4730 if (!Union) { 4731 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4732 UE = FieldRecord->field_end(); 4733 UI != UE; ++UI) { 4734 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4735 CXXRecordDecl *UnionFieldRecord = 4736 UnionFieldType->getAsCXXRecordDecl(); 4737 4738 // -- a variant member with a non-trivial [move] assignment operator 4739 // and X is a union-like class 4740 if (UnionFieldRecord && 4741 !UnionFieldRecord->hasTrivialMoveAssignment()) 4742 return true; 4743 } 4744 } 4745 4746 // Don't try to initalize an anonymous union 4747 continue; 4748 // -- a variant member with a non-trivial [move] assignment operator 4749 // and X is a union-like class 4750 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4751 return true; 4752 } 4753 4754 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4755 if (!MoveOper || MoveOper->isDeleted()) 4756 return true; 4757 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4758 return true; 4759 4760 // -- for the move assignment operator, a [non-static data member] with a 4761 // type that does not have a move assignment operator and is not 4762 // trivially copyable. 4763 if (!MoveOper->isMoveAssignmentOperator() && 4764 !FieldRecord->isTriviallyCopyable()) 4765 return true; 4766 } 4767 } 4768 4769 return false; 4770} 4771 4772bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4773 CXXRecordDecl *RD = DD->getParent(); 4774 assert(!RD->isDependentType() && "do deletion after instantiation"); 4775 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4776 return false; 4777 4778 SourceLocation Loc = DD->getLocation(); 4779 4780 // Do access control from the destructor 4781 ContextRAII CtorContext(*this, DD); 4782 4783 bool Union = RD->isUnion(); 4784 4785 // We do this because we should never actually use an anonymous 4786 // union's destructor. 4787 if (Union && RD->isAnonymousStructOrUnion()) 4788 return false; 4789 4790 // C++0x [class.dtor]p5 4791 // A defaulted destructor for a class X is defined as deleted if: 4792 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4793 BE = RD->bases_end(); 4794 BI != BE; ++BI) { 4795 // We'll handle this one later 4796 if (BI->isVirtual()) 4797 continue; 4798 4799 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4800 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4801 assert(BaseDtor && "base has no destructor"); 4802 4803 // -- any direct or virtual base class has a deleted destructor or 4804 // a destructor that is inaccessible from the defaulted destructor 4805 if (BaseDtor->isDeleted()) 4806 return true; 4807 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4808 AR_accessible) 4809 return true; 4810 } 4811 4812 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4813 BE = RD->vbases_end(); 4814 BI != BE; ++BI) { 4815 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4816 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4817 assert(BaseDtor && "base has no destructor"); 4818 4819 // -- any direct or virtual base class has a deleted destructor or 4820 // a destructor that is inaccessible from the defaulted destructor 4821 if (BaseDtor->isDeleted()) 4822 return true; 4823 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4824 AR_accessible) 4825 return true; 4826 } 4827 4828 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4829 FE = RD->field_end(); 4830 FI != FE; ++FI) { 4831 QualType FieldType = Context.getBaseElementType(FI->getType()); 4832 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4833 if (FieldRecord) { 4834 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4835 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4836 UE = FieldRecord->field_end(); 4837 UI != UE; ++UI) { 4838 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4839 CXXRecordDecl *UnionFieldRecord = 4840 UnionFieldType->getAsCXXRecordDecl(); 4841 4842 // -- X is a union-like class that has a variant member with a non- 4843 // trivial destructor. 4844 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4845 return true; 4846 } 4847 // Technically we are supposed to do this next check unconditionally. 4848 // But that makes absolutely no sense. 4849 } else { 4850 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4851 4852 // -- any of the non-static data members has class type M (or array 4853 // thereof) and M has a deleted destructor or a destructor that is 4854 // inaccessible from the defaulted destructor 4855 if (FieldDtor->isDeleted()) 4856 return true; 4857 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4858 AR_accessible) 4859 return true; 4860 4861 // -- X is a union-like class that has a variant member with a non- 4862 // trivial destructor. 4863 if (Union && !FieldDtor->isTrivial()) 4864 return true; 4865 } 4866 } 4867 } 4868 4869 if (DD->isVirtual()) { 4870 FunctionDecl *OperatorDelete = 0; 4871 DeclarationName Name = 4872 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4873 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4874 false)) 4875 return true; 4876 } 4877 4878 4879 return false; 4880} 4881 4882/// \brief Data used with FindHiddenVirtualMethod 4883namespace { 4884 struct FindHiddenVirtualMethodData { 4885 Sema *S; 4886 CXXMethodDecl *Method; 4887 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4888 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4889 }; 4890} 4891 4892/// \brief Member lookup function that determines whether a given C++ 4893/// method overloads virtual methods in a base class without overriding any, 4894/// to be used with CXXRecordDecl::lookupInBases(). 4895static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4896 CXXBasePath &Path, 4897 void *UserData) { 4898 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4899 4900 FindHiddenVirtualMethodData &Data 4901 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4902 4903 DeclarationName Name = Data.Method->getDeclName(); 4904 assert(Name.getNameKind() == DeclarationName::Identifier); 4905 4906 bool foundSameNameMethod = false; 4907 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4908 for (Path.Decls = BaseRecord->lookup(Name); 4909 Path.Decls.first != Path.Decls.second; 4910 ++Path.Decls.first) { 4911 NamedDecl *D = *Path.Decls.first; 4912 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4913 MD = MD->getCanonicalDecl(); 4914 foundSameNameMethod = true; 4915 // Interested only in hidden virtual methods. 4916 if (!MD->isVirtual()) 4917 continue; 4918 // If the method we are checking overrides a method from its base 4919 // don't warn about the other overloaded methods. 4920 if (!Data.S->IsOverload(Data.Method, MD, false)) 4921 return true; 4922 // Collect the overload only if its hidden. 4923 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4924 overloadedMethods.push_back(MD); 4925 } 4926 } 4927 4928 if (foundSameNameMethod) 4929 Data.OverloadedMethods.append(overloadedMethods.begin(), 4930 overloadedMethods.end()); 4931 return foundSameNameMethod; 4932} 4933 4934/// \brief See if a method overloads virtual methods in a base class without 4935/// overriding any. 4936void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4937 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4938 MD->getLocation()) == DiagnosticsEngine::Ignored) 4939 return; 4940 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4941 return; 4942 4943 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4944 /*bool RecordPaths=*/false, 4945 /*bool DetectVirtual=*/false); 4946 FindHiddenVirtualMethodData Data; 4947 Data.Method = MD; 4948 Data.S = this; 4949 4950 // Keep the base methods that were overriden or introduced in the subclass 4951 // by 'using' in a set. A base method not in this set is hidden. 4952 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4953 res.first != res.second; ++res.first) { 4954 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4955 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4956 E = MD->end_overridden_methods(); 4957 I != E; ++I) 4958 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4959 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4960 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4961 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4962 } 4963 4964 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4965 !Data.OverloadedMethods.empty()) { 4966 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4967 << MD << (Data.OverloadedMethods.size() > 1); 4968 4969 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4970 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4971 Diag(overloadedMD->getLocation(), 4972 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4973 } 4974 } 4975} 4976 4977void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4978 Decl *TagDecl, 4979 SourceLocation LBrac, 4980 SourceLocation RBrac, 4981 AttributeList *AttrList) { 4982 if (!TagDecl) 4983 return; 4984 4985 AdjustDeclIfTemplate(TagDecl); 4986 4987 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4988 // strict aliasing violation! 4989 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4990 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4991 4992 CheckCompletedCXXClass( 4993 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4994} 4995 4996/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4997/// special functions, such as the default constructor, copy 4998/// constructor, or destructor, to the given C++ class (C++ 4999/// [special]p1). This routine can only be executed just before the 5000/// definition of the class is complete. 5001void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5002 if (!ClassDecl->hasUserDeclaredConstructor()) 5003 ++ASTContext::NumImplicitDefaultConstructors; 5004 5005 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5006 ++ASTContext::NumImplicitCopyConstructors; 5007 5008 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5009 ++ASTContext::NumImplicitMoveConstructors; 5010 5011 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5012 ++ASTContext::NumImplicitCopyAssignmentOperators; 5013 5014 // If we have a dynamic class, then the copy assignment operator may be 5015 // virtual, so we have to declare it immediately. This ensures that, e.g., 5016 // it shows up in the right place in the vtable and that we diagnose 5017 // problems with the implicit exception specification. 5018 if (ClassDecl->isDynamicClass()) 5019 DeclareImplicitCopyAssignment(ClassDecl); 5020 } 5021 5022 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5023 ++ASTContext::NumImplicitMoveAssignmentOperators; 5024 5025 // Likewise for the move assignment operator. 5026 if (ClassDecl->isDynamicClass()) 5027 DeclareImplicitMoveAssignment(ClassDecl); 5028 } 5029 5030 if (!ClassDecl->hasUserDeclaredDestructor()) { 5031 ++ASTContext::NumImplicitDestructors; 5032 5033 // If we have a dynamic class, then the destructor may be virtual, so we 5034 // have to declare the destructor immediately. This ensures that, e.g., it 5035 // shows up in the right place in the vtable and that we diagnose problems 5036 // with the implicit exception specification. 5037 if (ClassDecl->isDynamicClass()) 5038 DeclareImplicitDestructor(ClassDecl); 5039 } 5040} 5041 5042void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5043 if (!D) 5044 return; 5045 5046 int NumParamList = D->getNumTemplateParameterLists(); 5047 for (int i = 0; i < NumParamList; i++) { 5048 TemplateParameterList* Params = D->getTemplateParameterList(i); 5049 for (TemplateParameterList::iterator Param = Params->begin(), 5050 ParamEnd = Params->end(); 5051 Param != ParamEnd; ++Param) { 5052 NamedDecl *Named = cast<NamedDecl>(*Param); 5053 if (Named->getDeclName()) { 5054 S->AddDecl(Named); 5055 IdResolver.AddDecl(Named); 5056 } 5057 } 5058 } 5059} 5060 5061void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5062 if (!D) 5063 return; 5064 5065 TemplateParameterList *Params = 0; 5066 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5067 Params = Template->getTemplateParameters(); 5068 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5069 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5070 Params = PartialSpec->getTemplateParameters(); 5071 else 5072 return; 5073 5074 for (TemplateParameterList::iterator Param = Params->begin(), 5075 ParamEnd = Params->end(); 5076 Param != ParamEnd; ++Param) { 5077 NamedDecl *Named = cast<NamedDecl>(*Param); 5078 if (Named->getDeclName()) { 5079 S->AddDecl(Named); 5080 IdResolver.AddDecl(Named); 5081 } 5082 } 5083} 5084 5085void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5086 if (!RecordD) return; 5087 AdjustDeclIfTemplate(RecordD); 5088 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5089 PushDeclContext(S, Record); 5090} 5091 5092void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5093 if (!RecordD) return; 5094 PopDeclContext(); 5095} 5096 5097/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5098/// parsing a top-level (non-nested) C++ class, and we are now 5099/// parsing those parts of the given Method declaration that could 5100/// not be parsed earlier (C++ [class.mem]p2), such as default 5101/// arguments. This action should enter the scope of the given 5102/// Method declaration as if we had just parsed the qualified method 5103/// name. However, it should not bring the parameters into scope; 5104/// that will be performed by ActOnDelayedCXXMethodParameter. 5105void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5106} 5107 5108/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5109/// C++ method declaration. We're (re-)introducing the given 5110/// function parameter into scope for use in parsing later parts of 5111/// the method declaration. For example, we could see an 5112/// ActOnParamDefaultArgument event for this parameter. 5113void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5114 if (!ParamD) 5115 return; 5116 5117 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5118 5119 // If this parameter has an unparsed default argument, clear it out 5120 // to make way for the parsed default argument. 5121 if (Param->hasUnparsedDefaultArg()) 5122 Param->setDefaultArg(0); 5123 5124 S->AddDecl(Param); 5125 if (Param->getDeclName()) 5126 IdResolver.AddDecl(Param); 5127} 5128 5129/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5130/// processing the delayed method declaration for Method. The method 5131/// declaration is now considered finished. There may be a separate 5132/// ActOnStartOfFunctionDef action later (not necessarily 5133/// immediately!) for this method, if it was also defined inside the 5134/// class body. 5135void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5136 if (!MethodD) 5137 return; 5138 5139 AdjustDeclIfTemplate(MethodD); 5140 5141 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5142 5143 // Now that we have our default arguments, check the constructor 5144 // again. It could produce additional diagnostics or affect whether 5145 // the class has implicitly-declared destructors, among other 5146 // things. 5147 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5148 CheckConstructor(Constructor); 5149 5150 // Check the default arguments, which we may have added. 5151 if (!Method->isInvalidDecl()) 5152 CheckCXXDefaultArguments(Method); 5153} 5154 5155/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5156/// the well-formedness of the constructor declarator @p D with type @p 5157/// R. If there are any errors in the declarator, this routine will 5158/// emit diagnostics and set the invalid bit to true. In any case, the type 5159/// will be updated to reflect a well-formed type for the constructor and 5160/// returned. 5161QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5162 StorageClass &SC) { 5163 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5164 5165 // C++ [class.ctor]p3: 5166 // A constructor shall not be virtual (10.3) or static (9.4). A 5167 // constructor can be invoked for a const, volatile or const 5168 // volatile object. A constructor shall not be declared const, 5169 // volatile, or const volatile (9.3.2). 5170 if (isVirtual) { 5171 if (!D.isInvalidType()) 5172 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5173 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5174 << SourceRange(D.getIdentifierLoc()); 5175 D.setInvalidType(); 5176 } 5177 if (SC == SC_Static) { 5178 if (!D.isInvalidType()) 5179 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5180 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5181 << SourceRange(D.getIdentifierLoc()); 5182 D.setInvalidType(); 5183 SC = SC_None; 5184 } 5185 5186 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5187 if (FTI.TypeQuals != 0) { 5188 if (FTI.TypeQuals & Qualifiers::Const) 5189 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5190 << "const" << SourceRange(D.getIdentifierLoc()); 5191 if (FTI.TypeQuals & Qualifiers::Volatile) 5192 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5193 << "volatile" << SourceRange(D.getIdentifierLoc()); 5194 if (FTI.TypeQuals & Qualifiers::Restrict) 5195 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5196 << "restrict" << SourceRange(D.getIdentifierLoc()); 5197 D.setInvalidType(); 5198 } 5199 5200 // C++0x [class.ctor]p4: 5201 // A constructor shall not be declared with a ref-qualifier. 5202 if (FTI.hasRefQualifier()) { 5203 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5204 << FTI.RefQualifierIsLValueRef 5205 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5206 D.setInvalidType(); 5207 } 5208 5209 // Rebuild the function type "R" without any type qualifiers (in 5210 // case any of the errors above fired) and with "void" as the 5211 // return type, since constructors don't have return types. 5212 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5213 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5214 return R; 5215 5216 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5217 EPI.TypeQuals = 0; 5218 EPI.RefQualifier = RQ_None; 5219 5220 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5221 Proto->getNumArgs(), EPI); 5222} 5223 5224/// CheckConstructor - Checks a fully-formed constructor for 5225/// well-formedness, issuing any diagnostics required. Returns true if 5226/// the constructor declarator is invalid. 5227void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5228 CXXRecordDecl *ClassDecl 5229 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5230 if (!ClassDecl) 5231 return Constructor->setInvalidDecl(); 5232 5233 // C++ [class.copy]p3: 5234 // A declaration of a constructor for a class X is ill-formed if 5235 // its first parameter is of type (optionally cv-qualified) X and 5236 // either there are no other parameters or else all other 5237 // parameters have default arguments. 5238 if (!Constructor->isInvalidDecl() && 5239 ((Constructor->getNumParams() == 1) || 5240 (Constructor->getNumParams() > 1 && 5241 Constructor->getParamDecl(1)->hasDefaultArg())) && 5242 Constructor->getTemplateSpecializationKind() 5243 != TSK_ImplicitInstantiation) { 5244 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5245 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5246 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5247 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5248 const char *ConstRef 5249 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5250 : " const &"; 5251 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5252 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5253 5254 // FIXME: Rather that making the constructor invalid, we should endeavor 5255 // to fix the type. 5256 Constructor->setInvalidDecl(); 5257 } 5258 } 5259} 5260 5261/// CheckDestructor - Checks a fully-formed destructor definition for 5262/// well-formedness, issuing any diagnostics required. Returns true 5263/// on error. 5264bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5265 CXXRecordDecl *RD = Destructor->getParent(); 5266 5267 if (Destructor->isVirtual()) { 5268 SourceLocation Loc; 5269 5270 if (!Destructor->isImplicit()) 5271 Loc = Destructor->getLocation(); 5272 else 5273 Loc = RD->getLocation(); 5274 5275 // If we have a virtual destructor, look up the deallocation function 5276 FunctionDecl *OperatorDelete = 0; 5277 DeclarationName Name = 5278 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5279 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5280 return true; 5281 5282 MarkDeclarationReferenced(Loc, OperatorDelete); 5283 5284 Destructor->setOperatorDelete(OperatorDelete); 5285 } 5286 5287 return false; 5288} 5289 5290static inline bool 5291FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5292 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5293 FTI.ArgInfo[0].Param && 5294 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5295} 5296 5297/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5298/// the well-formednes of the destructor declarator @p D with type @p 5299/// R. If there are any errors in the declarator, this routine will 5300/// emit diagnostics and set the declarator to invalid. Even if this happens, 5301/// will be updated to reflect a well-formed type for the destructor and 5302/// returned. 5303QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5304 StorageClass& SC) { 5305 // C++ [class.dtor]p1: 5306 // [...] A typedef-name that names a class is a class-name 5307 // (7.1.3); however, a typedef-name that names a class shall not 5308 // be used as the identifier in the declarator for a destructor 5309 // declaration. 5310 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5311 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5312 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5313 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5314 else if (const TemplateSpecializationType *TST = 5315 DeclaratorType->getAs<TemplateSpecializationType>()) 5316 if (TST->isTypeAlias()) 5317 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5318 << DeclaratorType << 1; 5319 5320 // C++ [class.dtor]p2: 5321 // A destructor is used to destroy objects of its class type. A 5322 // destructor takes no parameters, and no return type can be 5323 // specified for it (not even void). The address of a destructor 5324 // shall not be taken. A destructor shall not be static. A 5325 // destructor can be invoked for a const, volatile or const 5326 // volatile object. A destructor shall not be declared const, 5327 // volatile or const volatile (9.3.2). 5328 if (SC == SC_Static) { 5329 if (!D.isInvalidType()) 5330 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5331 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5332 << SourceRange(D.getIdentifierLoc()) 5333 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5334 5335 SC = SC_None; 5336 } 5337 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5338 // Destructors don't have return types, but the parser will 5339 // happily parse something like: 5340 // 5341 // class X { 5342 // float ~X(); 5343 // }; 5344 // 5345 // The return type will be eliminated later. 5346 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5347 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5348 << SourceRange(D.getIdentifierLoc()); 5349 } 5350 5351 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5352 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5353 if (FTI.TypeQuals & Qualifiers::Const) 5354 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5355 << "const" << SourceRange(D.getIdentifierLoc()); 5356 if (FTI.TypeQuals & Qualifiers::Volatile) 5357 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5358 << "volatile" << SourceRange(D.getIdentifierLoc()); 5359 if (FTI.TypeQuals & Qualifiers::Restrict) 5360 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5361 << "restrict" << SourceRange(D.getIdentifierLoc()); 5362 D.setInvalidType(); 5363 } 5364 5365 // C++0x [class.dtor]p2: 5366 // A destructor shall not be declared with a ref-qualifier. 5367 if (FTI.hasRefQualifier()) { 5368 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5369 << FTI.RefQualifierIsLValueRef 5370 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5371 D.setInvalidType(); 5372 } 5373 5374 // Make sure we don't have any parameters. 5375 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5376 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5377 5378 // Delete the parameters. 5379 FTI.freeArgs(); 5380 D.setInvalidType(); 5381 } 5382 5383 // Make sure the destructor isn't variadic. 5384 if (FTI.isVariadic) { 5385 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5386 D.setInvalidType(); 5387 } 5388 5389 // Rebuild the function type "R" without any type qualifiers or 5390 // parameters (in case any of the errors above fired) and with 5391 // "void" as the return type, since destructors don't have return 5392 // types. 5393 if (!D.isInvalidType()) 5394 return R; 5395 5396 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5397 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5398 EPI.Variadic = false; 5399 EPI.TypeQuals = 0; 5400 EPI.RefQualifier = RQ_None; 5401 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5402} 5403 5404/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5405/// well-formednes of the conversion function declarator @p D with 5406/// type @p R. If there are any errors in the declarator, this routine 5407/// will emit diagnostics and return true. Otherwise, it will return 5408/// false. Either way, the type @p R will be updated to reflect a 5409/// well-formed type for the conversion operator. 5410void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5411 StorageClass& SC) { 5412 // C++ [class.conv.fct]p1: 5413 // Neither parameter types nor return type can be specified. The 5414 // type of a conversion function (8.3.5) is "function taking no 5415 // parameter returning conversion-type-id." 5416 if (SC == SC_Static) { 5417 if (!D.isInvalidType()) 5418 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5419 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5420 << SourceRange(D.getIdentifierLoc()); 5421 D.setInvalidType(); 5422 SC = SC_None; 5423 } 5424 5425 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5426 5427 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5428 // Conversion functions don't have return types, but the parser will 5429 // happily parse something like: 5430 // 5431 // class X { 5432 // float operator bool(); 5433 // }; 5434 // 5435 // The return type will be changed later anyway. 5436 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5437 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5438 << SourceRange(D.getIdentifierLoc()); 5439 D.setInvalidType(); 5440 } 5441 5442 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5443 5444 // Make sure we don't have any parameters. 5445 if (Proto->getNumArgs() > 0) { 5446 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5447 5448 // Delete the parameters. 5449 D.getFunctionTypeInfo().freeArgs(); 5450 D.setInvalidType(); 5451 } else if (Proto->isVariadic()) { 5452 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5453 D.setInvalidType(); 5454 } 5455 5456 // Diagnose "&operator bool()" and other such nonsense. This 5457 // is actually a gcc extension which we don't support. 5458 if (Proto->getResultType() != ConvType) { 5459 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5460 << Proto->getResultType(); 5461 D.setInvalidType(); 5462 ConvType = Proto->getResultType(); 5463 } 5464 5465 // C++ [class.conv.fct]p4: 5466 // The conversion-type-id shall not represent a function type nor 5467 // an array type. 5468 if (ConvType->isArrayType()) { 5469 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5470 ConvType = Context.getPointerType(ConvType); 5471 D.setInvalidType(); 5472 } else if (ConvType->isFunctionType()) { 5473 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5474 ConvType = Context.getPointerType(ConvType); 5475 D.setInvalidType(); 5476 } 5477 5478 // Rebuild the function type "R" without any parameters (in case any 5479 // of the errors above fired) and with the conversion type as the 5480 // return type. 5481 if (D.isInvalidType()) 5482 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5483 5484 // C++0x explicit conversion operators. 5485 if (D.getDeclSpec().isExplicitSpecified()) 5486 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5487 getLangOptions().CPlusPlus0x ? 5488 diag::warn_cxx98_compat_explicit_conversion_functions : 5489 diag::ext_explicit_conversion_functions) 5490 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5491} 5492 5493/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5494/// the declaration of the given C++ conversion function. This routine 5495/// is responsible for recording the conversion function in the C++ 5496/// class, if possible. 5497Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5498 assert(Conversion && "Expected to receive a conversion function declaration"); 5499 5500 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5501 5502 // Make sure we aren't redeclaring the conversion function. 5503 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5504 5505 // C++ [class.conv.fct]p1: 5506 // [...] A conversion function is never used to convert a 5507 // (possibly cv-qualified) object to the (possibly cv-qualified) 5508 // same object type (or a reference to it), to a (possibly 5509 // cv-qualified) base class of that type (or a reference to it), 5510 // or to (possibly cv-qualified) void. 5511 // FIXME: Suppress this warning if the conversion function ends up being a 5512 // virtual function that overrides a virtual function in a base class. 5513 QualType ClassType 5514 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5515 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5516 ConvType = ConvTypeRef->getPointeeType(); 5517 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5518 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5519 /* Suppress diagnostics for instantiations. */; 5520 else if (ConvType->isRecordType()) { 5521 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5522 if (ConvType == ClassType) 5523 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5524 << ClassType; 5525 else if (IsDerivedFrom(ClassType, ConvType)) 5526 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5527 << ClassType << ConvType; 5528 } else if (ConvType->isVoidType()) { 5529 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5530 << ClassType << ConvType; 5531 } 5532 5533 if (FunctionTemplateDecl *ConversionTemplate 5534 = Conversion->getDescribedFunctionTemplate()) 5535 return ConversionTemplate; 5536 5537 return Conversion; 5538} 5539 5540//===----------------------------------------------------------------------===// 5541// Namespace Handling 5542//===----------------------------------------------------------------------===// 5543 5544 5545 5546/// ActOnStartNamespaceDef - This is called at the start of a namespace 5547/// definition. 5548Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5549 SourceLocation InlineLoc, 5550 SourceLocation NamespaceLoc, 5551 SourceLocation IdentLoc, 5552 IdentifierInfo *II, 5553 SourceLocation LBrace, 5554 AttributeList *AttrList) { 5555 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5556 // For anonymous namespace, take the location of the left brace. 5557 SourceLocation Loc = II ? IdentLoc : LBrace; 5558 bool IsInline = InlineLoc.isValid(); 5559 bool IsInvalid = false; 5560 bool IsStd = false; 5561 bool AddToKnown = false; 5562 Scope *DeclRegionScope = NamespcScope->getParent(); 5563 5564 NamespaceDecl *PrevNS = 0; 5565 if (II) { 5566 // C++ [namespace.def]p2: 5567 // The identifier in an original-namespace-definition shall not 5568 // have been previously defined in the declarative region in 5569 // which the original-namespace-definition appears. The 5570 // identifier in an original-namespace-definition is the name of 5571 // the namespace. Subsequently in that declarative region, it is 5572 // treated as an original-namespace-name. 5573 // 5574 // Since namespace names are unique in their scope, and we don't 5575 // look through using directives, just look for any ordinary names. 5576 5577 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5578 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5579 Decl::IDNS_Namespace; 5580 NamedDecl *PrevDecl = 0; 5581 for (DeclContext::lookup_result R 5582 = CurContext->getRedeclContext()->lookup(II); 5583 R.first != R.second; ++R.first) { 5584 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5585 PrevDecl = *R.first; 5586 break; 5587 } 5588 } 5589 5590 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5591 5592 if (PrevNS) { 5593 // This is an extended namespace definition. 5594 if (IsInline != PrevNS->isInline()) { 5595 // inline-ness must match 5596 if (PrevNS->isInline()) { 5597 // The user probably just forgot the 'inline', so suggest that it 5598 // be added back. 5599 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5600 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5601 } else { 5602 Diag(Loc, diag::err_inline_namespace_mismatch) 5603 << IsInline; 5604 } 5605 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5606 5607 IsInline = PrevNS->isInline(); 5608 } 5609 } else if (PrevDecl) { 5610 // This is an invalid name redefinition. 5611 Diag(Loc, diag::err_redefinition_different_kind) 5612 << II; 5613 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5614 IsInvalid = true; 5615 // Continue on to push Namespc as current DeclContext and return it. 5616 } else if (II->isStr("std") && 5617 CurContext->getRedeclContext()->isTranslationUnit()) { 5618 // This is the first "real" definition of the namespace "std", so update 5619 // our cache of the "std" namespace to point at this definition. 5620 PrevNS = getStdNamespace(); 5621 IsStd = true; 5622 AddToKnown = !IsInline; 5623 } else { 5624 // We've seen this namespace for the first time. 5625 AddToKnown = !IsInline; 5626 } 5627 } else { 5628 // Anonymous namespaces. 5629 5630 // Determine whether the parent already has an anonymous namespace. 5631 DeclContext *Parent = CurContext->getRedeclContext(); 5632 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5633 PrevNS = TU->getAnonymousNamespace(); 5634 } else { 5635 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5636 PrevNS = ND->getAnonymousNamespace(); 5637 } 5638 5639 if (PrevNS && IsInline != PrevNS->isInline()) { 5640 // inline-ness must match 5641 Diag(Loc, diag::err_inline_namespace_mismatch) 5642 << IsInline; 5643 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5644 5645 // Recover by ignoring the new namespace's inline status. 5646 IsInline = PrevNS->isInline(); 5647 } 5648 } 5649 5650 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5651 StartLoc, Loc, II, PrevNS); 5652 if (IsInvalid) 5653 Namespc->setInvalidDecl(); 5654 5655 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5656 5657 // FIXME: Should we be merging attributes? 5658 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5659 PushNamespaceVisibilityAttr(Attr); 5660 5661 if (IsStd) 5662 StdNamespace = Namespc; 5663 if (AddToKnown) 5664 KnownNamespaces[Namespc] = false; 5665 5666 if (II) { 5667 PushOnScopeChains(Namespc, DeclRegionScope); 5668 } else { 5669 // Link the anonymous namespace into its parent. 5670 DeclContext *Parent = CurContext->getRedeclContext(); 5671 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5672 TU->setAnonymousNamespace(Namespc); 5673 } else { 5674 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5675 } 5676 5677 CurContext->addDecl(Namespc); 5678 5679 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5680 // behaves as if it were replaced by 5681 // namespace unique { /* empty body */ } 5682 // using namespace unique; 5683 // namespace unique { namespace-body } 5684 // where all occurrences of 'unique' in a translation unit are 5685 // replaced by the same identifier and this identifier differs 5686 // from all other identifiers in the entire program. 5687 5688 // We just create the namespace with an empty name and then add an 5689 // implicit using declaration, just like the standard suggests. 5690 // 5691 // CodeGen enforces the "universally unique" aspect by giving all 5692 // declarations semantically contained within an anonymous 5693 // namespace internal linkage. 5694 5695 if (!PrevNS) { 5696 UsingDirectiveDecl* UD 5697 = UsingDirectiveDecl::Create(Context, CurContext, 5698 /* 'using' */ LBrace, 5699 /* 'namespace' */ SourceLocation(), 5700 /* qualifier */ NestedNameSpecifierLoc(), 5701 /* identifier */ SourceLocation(), 5702 Namespc, 5703 /* Ancestor */ CurContext); 5704 UD->setImplicit(); 5705 CurContext->addDecl(UD); 5706 } 5707 } 5708 5709 // Although we could have an invalid decl (i.e. the namespace name is a 5710 // redefinition), push it as current DeclContext and try to continue parsing. 5711 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5712 // for the namespace has the declarations that showed up in that particular 5713 // namespace definition. 5714 PushDeclContext(NamespcScope, Namespc); 5715 return Namespc; 5716} 5717 5718/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5719/// is a namespace alias, returns the namespace it points to. 5720static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5721 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5722 return AD->getNamespace(); 5723 return dyn_cast_or_null<NamespaceDecl>(D); 5724} 5725 5726/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5727/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5728void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5729 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5730 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5731 Namespc->setRBraceLoc(RBrace); 5732 PopDeclContext(); 5733 if (Namespc->hasAttr<VisibilityAttr>()) 5734 PopPragmaVisibility(); 5735} 5736 5737CXXRecordDecl *Sema::getStdBadAlloc() const { 5738 return cast_or_null<CXXRecordDecl>( 5739 StdBadAlloc.get(Context.getExternalSource())); 5740} 5741 5742NamespaceDecl *Sema::getStdNamespace() const { 5743 return cast_or_null<NamespaceDecl>( 5744 StdNamespace.get(Context.getExternalSource())); 5745} 5746 5747/// \brief Retrieve the special "std" namespace, which may require us to 5748/// implicitly define the namespace. 5749NamespaceDecl *Sema::getOrCreateStdNamespace() { 5750 if (!StdNamespace) { 5751 // The "std" namespace has not yet been defined, so build one implicitly. 5752 StdNamespace = NamespaceDecl::Create(Context, 5753 Context.getTranslationUnitDecl(), 5754 /*Inline=*/false, 5755 SourceLocation(), SourceLocation(), 5756 &PP.getIdentifierTable().get("std"), 5757 /*PrevDecl=*/0); 5758 getStdNamespace()->setImplicit(true); 5759 } 5760 5761 return getStdNamespace(); 5762} 5763 5764/// \brief Determine whether a using statement is in a context where it will be 5765/// apply in all contexts. 5766static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5767 switch (CurContext->getDeclKind()) { 5768 case Decl::TranslationUnit: 5769 return true; 5770 case Decl::LinkageSpec: 5771 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5772 default: 5773 return false; 5774 } 5775} 5776 5777namespace { 5778 5779// Callback to only accept typo corrections that are namespaces. 5780class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5781 public: 5782 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5783 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5784 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5785 } 5786 return false; 5787 } 5788}; 5789 5790} 5791 5792static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5793 CXXScopeSpec &SS, 5794 SourceLocation IdentLoc, 5795 IdentifierInfo *Ident) { 5796 NamespaceValidatorCCC Validator; 5797 R.clear(); 5798 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5799 R.getLookupKind(), Sc, &SS, 5800 &Validator)) { 5801 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5802 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5803 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5804 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5805 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5806 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5807 else 5808 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5809 << Ident << CorrectedQuotedStr 5810 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5811 5812 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5813 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5814 5815 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5816 R.addDecl(Corrected.getCorrectionDecl()); 5817 return true; 5818 } 5819 return false; 5820} 5821 5822Decl *Sema::ActOnUsingDirective(Scope *S, 5823 SourceLocation UsingLoc, 5824 SourceLocation NamespcLoc, 5825 CXXScopeSpec &SS, 5826 SourceLocation IdentLoc, 5827 IdentifierInfo *NamespcName, 5828 AttributeList *AttrList) { 5829 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5830 assert(NamespcName && "Invalid NamespcName."); 5831 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5832 5833 // This can only happen along a recovery path. 5834 while (S->getFlags() & Scope::TemplateParamScope) 5835 S = S->getParent(); 5836 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5837 5838 UsingDirectiveDecl *UDir = 0; 5839 NestedNameSpecifier *Qualifier = 0; 5840 if (SS.isSet()) 5841 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5842 5843 // Lookup namespace name. 5844 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5845 LookupParsedName(R, S, &SS); 5846 if (R.isAmbiguous()) 5847 return 0; 5848 5849 if (R.empty()) { 5850 R.clear(); 5851 // Allow "using namespace std;" or "using namespace ::std;" even if 5852 // "std" hasn't been defined yet, for GCC compatibility. 5853 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5854 NamespcName->isStr("std")) { 5855 Diag(IdentLoc, diag::ext_using_undefined_std); 5856 R.addDecl(getOrCreateStdNamespace()); 5857 R.resolveKind(); 5858 } 5859 // Otherwise, attempt typo correction. 5860 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5861 } 5862 5863 if (!R.empty()) { 5864 NamedDecl *Named = R.getFoundDecl(); 5865 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5866 && "expected namespace decl"); 5867 // C++ [namespace.udir]p1: 5868 // A using-directive specifies that the names in the nominated 5869 // namespace can be used in the scope in which the 5870 // using-directive appears after the using-directive. During 5871 // unqualified name lookup (3.4.1), the names appear as if they 5872 // were declared in the nearest enclosing namespace which 5873 // contains both the using-directive and the nominated 5874 // namespace. [Note: in this context, "contains" means "contains 5875 // directly or indirectly". ] 5876 5877 // Find enclosing context containing both using-directive and 5878 // nominated namespace. 5879 NamespaceDecl *NS = getNamespaceDecl(Named); 5880 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5881 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5882 CommonAncestor = CommonAncestor->getParent(); 5883 5884 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5885 SS.getWithLocInContext(Context), 5886 IdentLoc, Named, CommonAncestor); 5887 5888 if (IsUsingDirectiveInToplevelContext(CurContext) && 5889 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5890 Diag(IdentLoc, diag::warn_using_directive_in_header); 5891 } 5892 5893 PushUsingDirective(S, UDir); 5894 } else { 5895 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5896 } 5897 5898 // FIXME: We ignore attributes for now. 5899 return UDir; 5900} 5901 5902void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5903 // If scope has associated entity, then using directive is at namespace 5904 // or translation unit scope. We add UsingDirectiveDecls, into 5905 // it's lookup structure. 5906 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5907 Ctx->addDecl(UDir); 5908 else 5909 // Otherwise it is block-sope. using-directives will affect lookup 5910 // only to the end of scope. 5911 S->PushUsingDirective(UDir); 5912} 5913 5914 5915Decl *Sema::ActOnUsingDeclaration(Scope *S, 5916 AccessSpecifier AS, 5917 bool HasUsingKeyword, 5918 SourceLocation UsingLoc, 5919 CXXScopeSpec &SS, 5920 UnqualifiedId &Name, 5921 AttributeList *AttrList, 5922 bool IsTypeName, 5923 SourceLocation TypenameLoc) { 5924 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5925 5926 switch (Name.getKind()) { 5927 case UnqualifiedId::IK_ImplicitSelfParam: 5928 case UnqualifiedId::IK_Identifier: 5929 case UnqualifiedId::IK_OperatorFunctionId: 5930 case UnqualifiedId::IK_LiteralOperatorId: 5931 case UnqualifiedId::IK_ConversionFunctionId: 5932 break; 5933 5934 case UnqualifiedId::IK_ConstructorName: 5935 case UnqualifiedId::IK_ConstructorTemplateId: 5936 // C++0x inherited constructors. 5937 Diag(Name.getSourceRange().getBegin(), 5938 getLangOptions().CPlusPlus0x ? 5939 diag::warn_cxx98_compat_using_decl_constructor : 5940 diag::err_using_decl_constructor) 5941 << SS.getRange(); 5942 5943 if (getLangOptions().CPlusPlus0x) break; 5944 5945 return 0; 5946 5947 case UnqualifiedId::IK_DestructorName: 5948 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5949 << SS.getRange(); 5950 return 0; 5951 5952 case UnqualifiedId::IK_TemplateId: 5953 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5954 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5955 return 0; 5956 } 5957 5958 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5959 DeclarationName TargetName = TargetNameInfo.getName(); 5960 if (!TargetName) 5961 return 0; 5962 5963 // Warn about using declarations. 5964 // TODO: store that the declaration was written without 'using' and 5965 // talk about access decls instead of using decls in the 5966 // diagnostics. 5967 if (!HasUsingKeyword) { 5968 UsingLoc = Name.getSourceRange().getBegin(); 5969 5970 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5971 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5972 } 5973 5974 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5975 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5976 return 0; 5977 5978 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5979 TargetNameInfo, AttrList, 5980 /* IsInstantiation */ false, 5981 IsTypeName, TypenameLoc); 5982 if (UD) 5983 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5984 5985 return UD; 5986} 5987 5988/// \brief Determine whether a using declaration considers the given 5989/// declarations as "equivalent", e.g., if they are redeclarations of 5990/// the same entity or are both typedefs of the same type. 5991static bool 5992IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5993 bool &SuppressRedeclaration) { 5994 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5995 SuppressRedeclaration = false; 5996 return true; 5997 } 5998 5999 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6000 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6001 SuppressRedeclaration = true; 6002 return Context.hasSameType(TD1->getUnderlyingType(), 6003 TD2->getUnderlyingType()); 6004 } 6005 6006 return false; 6007} 6008 6009 6010/// Determines whether to create a using shadow decl for a particular 6011/// decl, given the set of decls existing prior to this using lookup. 6012bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6013 const LookupResult &Previous) { 6014 // Diagnose finding a decl which is not from a base class of the 6015 // current class. We do this now because there are cases where this 6016 // function will silently decide not to build a shadow decl, which 6017 // will pre-empt further diagnostics. 6018 // 6019 // We don't need to do this in C++0x because we do the check once on 6020 // the qualifier. 6021 // 6022 // FIXME: diagnose the following if we care enough: 6023 // struct A { int foo; }; 6024 // struct B : A { using A::foo; }; 6025 // template <class T> struct C : A {}; 6026 // template <class T> struct D : C<T> { using B::foo; } // <--- 6027 // This is invalid (during instantiation) in C++03 because B::foo 6028 // resolves to the using decl in B, which is not a base class of D<T>. 6029 // We can't diagnose it immediately because C<T> is an unknown 6030 // specialization. The UsingShadowDecl in D<T> then points directly 6031 // to A::foo, which will look well-formed when we instantiate. 6032 // The right solution is to not collapse the shadow-decl chain. 6033 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6034 DeclContext *OrigDC = Orig->getDeclContext(); 6035 6036 // Handle enums and anonymous structs. 6037 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6038 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6039 while (OrigRec->isAnonymousStructOrUnion()) 6040 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6041 6042 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6043 if (OrigDC == CurContext) { 6044 Diag(Using->getLocation(), 6045 diag::err_using_decl_nested_name_specifier_is_current_class) 6046 << Using->getQualifierLoc().getSourceRange(); 6047 Diag(Orig->getLocation(), diag::note_using_decl_target); 6048 return true; 6049 } 6050 6051 Diag(Using->getQualifierLoc().getBeginLoc(), 6052 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6053 << Using->getQualifier() 6054 << cast<CXXRecordDecl>(CurContext) 6055 << Using->getQualifierLoc().getSourceRange(); 6056 Diag(Orig->getLocation(), diag::note_using_decl_target); 6057 return true; 6058 } 6059 } 6060 6061 if (Previous.empty()) return false; 6062 6063 NamedDecl *Target = Orig; 6064 if (isa<UsingShadowDecl>(Target)) 6065 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6066 6067 // If the target happens to be one of the previous declarations, we 6068 // don't have a conflict. 6069 // 6070 // FIXME: but we might be increasing its access, in which case we 6071 // should redeclare it. 6072 NamedDecl *NonTag = 0, *Tag = 0; 6073 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6074 I != E; ++I) { 6075 NamedDecl *D = (*I)->getUnderlyingDecl(); 6076 bool Result; 6077 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6078 return Result; 6079 6080 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6081 } 6082 6083 if (Target->isFunctionOrFunctionTemplate()) { 6084 FunctionDecl *FD; 6085 if (isa<FunctionTemplateDecl>(Target)) 6086 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6087 else 6088 FD = cast<FunctionDecl>(Target); 6089 6090 NamedDecl *OldDecl = 0; 6091 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6092 case Ovl_Overload: 6093 return false; 6094 6095 case Ovl_NonFunction: 6096 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6097 break; 6098 6099 // We found a decl with the exact signature. 6100 case Ovl_Match: 6101 // If we're in a record, we want to hide the target, so we 6102 // return true (without a diagnostic) to tell the caller not to 6103 // build a shadow decl. 6104 if (CurContext->isRecord()) 6105 return true; 6106 6107 // If we're not in a record, this is an error. 6108 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6109 break; 6110 } 6111 6112 Diag(Target->getLocation(), diag::note_using_decl_target); 6113 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6114 return true; 6115 } 6116 6117 // Target is not a function. 6118 6119 if (isa<TagDecl>(Target)) { 6120 // No conflict between a tag and a non-tag. 6121 if (!Tag) return false; 6122 6123 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6124 Diag(Target->getLocation(), diag::note_using_decl_target); 6125 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6126 return true; 6127 } 6128 6129 // No conflict between a tag and a non-tag. 6130 if (!NonTag) return false; 6131 6132 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6133 Diag(Target->getLocation(), diag::note_using_decl_target); 6134 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6135 return true; 6136} 6137 6138/// Builds a shadow declaration corresponding to a 'using' declaration. 6139UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6140 UsingDecl *UD, 6141 NamedDecl *Orig) { 6142 6143 // If we resolved to another shadow declaration, just coalesce them. 6144 NamedDecl *Target = Orig; 6145 if (isa<UsingShadowDecl>(Target)) { 6146 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6147 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6148 } 6149 6150 UsingShadowDecl *Shadow 6151 = UsingShadowDecl::Create(Context, CurContext, 6152 UD->getLocation(), UD, Target); 6153 UD->addShadowDecl(Shadow); 6154 6155 Shadow->setAccess(UD->getAccess()); 6156 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6157 Shadow->setInvalidDecl(); 6158 6159 if (S) 6160 PushOnScopeChains(Shadow, S); 6161 else 6162 CurContext->addDecl(Shadow); 6163 6164 6165 return Shadow; 6166} 6167 6168/// Hides a using shadow declaration. This is required by the current 6169/// using-decl implementation when a resolvable using declaration in a 6170/// class is followed by a declaration which would hide or override 6171/// one or more of the using decl's targets; for example: 6172/// 6173/// struct Base { void foo(int); }; 6174/// struct Derived : Base { 6175/// using Base::foo; 6176/// void foo(int); 6177/// }; 6178/// 6179/// The governing language is C++03 [namespace.udecl]p12: 6180/// 6181/// When a using-declaration brings names from a base class into a 6182/// derived class scope, member functions in the derived class 6183/// override and/or hide member functions with the same name and 6184/// parameter types in a base class (rather than conflicting). 6185/// 6186/// There are two ways to implement this: 6187/// (1) optimistically create shadow decls when they're not hidden 6188/// by existing declarations, or 6189/// (2) don't create any shadow decls (or at least don't make them 6190/// visible) until we've fully parsed/instantiated the class. 6191/// The problem with (1) is that we might have to retroactively remove 6192/// a shadow decl, which requires several O(n) operations because the 6193/// decl structures are (very reasonably) not designed for removal. 6194/// (2) avoids this but is very fiddly and phase-dependent. 6195void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6196 if (Shadow->getDeclName().getNameKind() == 6197 DeclarationName::CXXConversionFunctionName) 6198 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6199 6200 // Remove it from the DeclContext... 6201 Shadow->getDeclContext()->removeDecl(Shadow); 6202 6203 // ...and the scope, if applicable... 6204 if (S) { 6205 S->RemoveDecl(Shadow); 6206 IdResolver.RemoveDecl(Shadow); 6207 } 6208 6209 // ...and the using decl. 6210 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6211 6212 // TODO: complain somehow if Shadow was used. It shouldn't 6213 // be possible for this to happen, because...? 6214} 6215 6216/// Builds a using declaration. 6217/// 6218/// \param IsInstantiation - Whether this call arises from an 6219/// instantiation of an unresolved using declaration. We treat 6220/// the lookup differently for these declarations. 6221NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6222 SourceLocation UsingLoc, 6223 CXXScopeSpec &SS, 6224 const DeclarationNameInfo &NameInfo, 6225 AttributeList *AttrList, 6226 bool IsInstantiation, 6227 bool IsTypeName, 6228 SourceLocation TypenameLoc) { 6229 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6230 SourceLocation IdentLoc = NameInfo.getLoc(); 6231 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6232 6233 // FIXME: We ignore attributes for now. 6234 6235 if (SS.isEmpty()) { 6236 Diag(IdentLoc, diag::err_using_requires_qualname); 6237 return 0; 6238 } 6239 6240 // Do the redeclaration lookup in the current scope. 6241 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6242 ForRedeclaration); 6243 Previous.setHideTags(false); 6244 if (S) { 6245 LookupName(Previous, S); 6246 6247 // It is really dumb that we have to do this. 6248 LookupResult::Filter F = Previous.makeFilter(); 6249 while (F.hasNext()) { 6250 NamedDecl *D = F.next(); 6251 if (!isDeclInScope(D, CurContext, S)) 6252 F.erase(); 6253 } 6254 F.done(); 6255 } else { 6256 assert(IsInstantiation && "no scope in non-instantiation"); 6257 assert(CurContext->isRecord() && "scope not record in instantiation"); 6258 LookupQualifiedName(Previous, CurContext); 6259 } 6260 6261 // Check for invalid redeclarations. 6262 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6263 return 0; 6264 6265 // Check for bad qualifiers. 6266 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6267 return 0; 6268 6269 DeclContext *LookupContext = computeDeclContext(SS); 6270 NamedDecl *D; 6271 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6272 if (!LookupContext) { 6273 if (IsTypeName) { 6274 // FIXME: not all declaration name kinds are legal here 6275 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6276 UsingLoc, TypenameLoc, 6277 QualifierLoc, 6278 IdentLoc, NameInfo.getName()); 6279 } else { 6280 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6281 QualifierLoc, NameInfo); 6282 } 6283 } else { 6284 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6285 NameInfo, IsTypeName); 6286 } 6287 D->setAccess(AS); 6288 CurContext->addDecl(D); 6289 6290 if (!LookupContext) return D; 6291 UsingDecl *UD = cast<UsingDecl>(D); 6292 6293 if (RequireCompleteDeclContext(SS, LookupContext)) { 6294 UD->setInvalidDecl(); 6295 return UD; 6296 } 6297 6298 // Constructor inheriting using decls get special treatment. 6299 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6300 if (CheckInheritedConstructorUsingDecl(UD)) 6301 UD->setInvalidDecl(); 6302 return UD; 6303 } 6304 6305 // Otherwise, look up the target name. 6306 6307 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6308 6309 // Unlike most lookups, we don't always want to hide tag 6310 // declarations: tag names are visible through the using declaration 6311 // even if hidden by ordinary names, *except* in a dependent context 6312 // where it's important for the sanity of two-phase lookup. 6313 if (!IsInstantiation) 6314 R.setHideTags(false); 6315 6316 LookupQualifiedName(R, LookupContext); 6317 6318 if (R.empty()) { 6319 Diag(IdentLoc, diag::err_no_member) 6320 << NameInfo.getName() << LookupContext << SS.getRange(); 6321 UD->setInvalidDecl(); 6322 return UD; 6323 } 6324 6325 if (R.isAmbiguous()) { 6326 UD->setInvalidDecl(); 6327 return UD; 6328 } 6329 6330 if (IsTypeName) { 6331 // If we asked for a typename and got a non-type decl, error out. 6332 if (!R.getAsSingle<TypeDecl>()) { 6333 Diag(IdentLoc, diag::err_using_typename_non_type); 6334 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6335 Diag((*I)->getUnderlyingDecl()->getLocation(), 6336 diag::note_using_decl_target); 6337 UD->setInvalidDecl(); 6338 return UD; 6339 } 6340 } else { 6341 // If we asked for a non-typename and we got a type, error out, 6342 // but only if this is an instantiation of an unresolved using 6343 // decl. Otherwise just silently find the type name. 6344 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6345 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6346 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6347 UD->setInvalidDecl(); 6348 return UD; 6349 } 6350 } 6351 6352 // C++0x N2914 [namespace.udecl]p6: 6353 // A using-declaration shall not name a namespace. 6354 if (R.getAsSingle<NamespaceDecl>()) { 6355 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6356 << SS.getRange(); 6357 UD->setInvalidDecl(); 6358 return UD; 6359 } 6360 6361 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6362 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6363 BuildUsingShadowDecl(S, UD, *I); 6364 } 6365 6366 return UD; 6367} 6368 6369/// Additional checks for a using declaration referring to a constructor name. 6370bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6371 if (UD->isTypeName()) { 6372 // FIXME: Cannot specify typename when specifying constructor 6373 return true; 6374 } 6375 6376 const Type *SourceType = UD->getQualifier()->getAsType(); 6377 assert(SourceType && 6378 "Using decl naming constructor doesn't have type in scope spec."); 6379 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6380 6381 // Check whether the named type is a direct base class. 6382 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6383 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6384 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6385 BaseIt != BaseE; ++BaseIt) { 6386 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6387 if (CanonicalSourceType == BaseType) 6388 break; 6389 } 6390 6391 if (BaseIt == BaseE) { 6392 // Did not find SourceType in the bases. 6393 Diag(UD->getUsingLocation(), 6394 diag::err_using_decl_constructor_not_in_direct_base) 6395 << UD->getNameInfo().getSourceRange() 6396 << QualType(SourceType, 0) << TargetClass; 6397 return true; 6398 } 6399 6400 BaseIt->setInheritConstructors(); 6401 6402 return false; 6403} 6404 6405/// Checks that the given using declaration is not an invalid 6406/// redeclaration. Note that this is checking only for the using decl 6407/// itself, not for any ill-formedness among the UsingShadowDecls. 6408bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6409 bool isTypeName, 6410 const CXXScopeSpec &SS, 6411 SourceLocation NameLoc, 6412 const LookupResult &Prev) { 6413 // C++03 [namespace.udecl]p8: 6414 // C++0x [namespace.udecl]p10: 6415 // A using-declaration is a declaration and can therefore be used 6416 // repeatedly where (and only where) multiple declarations are 6417 // allowed. 6418 // 6419 // That's in non-member contexts. 6420 if (!CurContext->getRedeclContext()->isRecord()) 6421 return false; 6422 6423 NestedNameSpecifier *Qual 6424 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6425 6426 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6427 NamedDecl *D = *I; 6428 6429 bool DTypename; 6430 NestedNameSpecifier *DQual; 6431 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6432 DTypename = UD->isTypeName(); 6433 DQual = UD->getQualifier(); 6434 } else if (UnresolvedUsingValueDecl *UD 6435 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6436 DTypename = false; 6437 DQual = UD->getQualifier(); 6438 } else if (UnresolvedUsingTypenameDecl *UD 6439 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6440 DTypename = true; 6441 DQual = UD->getQualifier(); 6442 } else continue; 6443 6444 // using decls differ if one says 'typename' and the other doesn't. 6445 // FIXME: non-dependent using decls? 6446 if (isTypeName != DTypename) continue; 6447 6448 // using decls differ if they name different scopes (but note that 6449 // template instantiation can cause this check to trigger when it 6450 // didn't before instantiation). 6451 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6452 Context.getCanonicalNestedNameSpecifier(DQual)) 6453 continue; 6454 6455 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6456 Diag(D->getLocation(), diag::note_using_decl) << 1; 6457 return true; 6458 } 6459 6460 return false; 6461} 6462 6463 6464/// Checks that the given nested-name qualifier used in a using decl 6465/// in the current context is appropriately related to the current 6466/// scope. If an error is found, diagnoses it and returns true. 6467bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6468 const CXXScopeSpec &SS, 6469 SourceLocation NameLoc) { 6470 DeclContext *NamedContext = computeDeclContext(SS); 6471 6472 if (!CurContext->isRecord()) { 6473 // C++03 [namespace.udecl]p3: 6474 // C++0x [namespace.udecl]p8: 6475 // A using-declaration for a class member shall be a member-declaration. 6476 6477 // If we weren't able to compute a valid scope, it must be a 6478 // dependent class scope. 6479 if (!NamedContext || NamedContext->isRecord()) { 6480 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6481 << SS.getRange(); 6482 return true; 6483 } 6484 6485 // Otherwise, everything is known to be fine. 6486 return false; 6487 } 6488 6489 // The current scope is a record. 6490 6491 // If the named context is dependent, we can't decide much. 6492 if (!NamedContext) { 6493 // FIXME: in C++0x, we can diagnose if we can prove that the 6494 // nested-name-specifier does not refer to a base class, which is 6495 // still possible in some cases. 6496 6497 // Otherwise we have to conservatively report that things might be 6498 // okay. 6499 return false; 6500 } 6501 6502 if (!NamedContext->isRecord()) { 6503 // Ideally this would point at the last name in the specifier, 6504 // but we don't have that level of source info. 6505 Diag(SS.getRange().getBegin(), 6506 diag::err_using_decl_nested_name_specifier_is_not_class) 6507 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6508 return true; 6509 } 6510 6511 if (!NamedContext->isDependentContext() && 6512 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6513 return true; 6514 6515 if (getLangOptions().CPlusPlus0x) { 6516 // C++0x [namespace.udecl]p3: 6517 // In a using-declaration used as a member-declaration, the 6518 // nested-name-specifier shall name a base class of the class 6519 // being defined. 6520 6521 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6522 cast<CXXRecordDecl>(NamedContext))) { 6523 if (CurContext == NamedContext) { 6524 Diag(NameLoc, 6525 diag::err_using_decl_nested_name_specifier_is_current_class) 6526 << SS.getRange(); 6527 return true; 6528 } 6529 6530 Diag(SS.getRange().getBegin(), 6531 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6532 << (NestedNameSpecifier*) SS.getScopeRep() 6533 << cast<CXXRecordDecl>(CurContext) 6534 << SS.getRange(); 6535 return true; 6536 } 6537 6538 return false; 6539 } 6540 6541 // C++03 [namespace.udecl]p4: 6542 // A using-declaration used as a member-declaration shall refer 6543 // to a member of a base class of the class being defined [etc.]. 6544 6545 // Salient point: SS doesn't have to name a base class as long as 6546 // lookup only finds members from base classes. Therefore we can 6547 // diagnose here only if we can prove that that can't happen, 6548 // i.e. if the class hierarchies provably don't intersect. 6549 6550 // TODO: it would be nice if "definitely valid" results were cached 6551 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6552 // need to be repeated. 6553 6554 struct UserData { 6555 llvm::DenseSet<const CXXRecordDecl*> Bases; 6556 6557 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6558 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6559 Data->Bases.insert(Base); 6560 return true; 6561 } 6562 6563 bool hasDependentBases(const CXXRecordDecl *Class) { 6564 return !Class->forallBases(collect, this); 6565 } 6566 6567 /// Returns true if the base is dependent or is one of the 6568 /// accumulated base classes. 6569 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6570 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6571 return !Data->Bases.count(Base); 6572 } 6573 6574 bool mightShareBases(const CXXRecordDecl *Class) { 6575 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6576 } 6577 }; 6578 6579 UserData Data; 6580 6581 // Returns false if we find a dependent base. 6582 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6583 return false; 6584 6585 // Returns false if the class has a dependent base or if it or one 6586 // of its bases is present in the base set of the current context. 6587 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6588 return false; 6589 6590 Diag(SS.getRange().getBegin(), 6591 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6592 << (NestedNameSpecifier*) SS.getScopeRep() 6593 << cast<CXXRecordDecl>(CurContext) 6594 << SS.getRange(); 6595 6596 return true; 6597} 6598 6599Decl *Sema::ActOnAliasDeclaration(Scope *S, 6600 AccessSpecifier AS, 6601 MultiTemplateParamsArg TemplateParamLists, 6602 SourceLocation UsingLoc, 6603 UnqualifiedId &Name, 6604 TypeResult Type) { 6605 // Skip up to the relevant declaration scope. 6606 while (S->getFlags() & Scope::TemplateParamScope) 6607 S = S->getParent(); 6608 assert((S->getFlags() & Scope::DeclScope) && 6609 "got alias-declaration outside of declaration scope"); 6610 6611 if (Type.isInvalid()) 6612 return 0; 6613 6614 bool Invalid = false; 6615 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6616 TypeSourceInfo *TInfo = 0; 6617 GetTypeFromParser(Type.get(), &TInfo); 6618 6619 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6620 return 0; 6621 6622 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6623 UPPC_DeclarationType)) { 6624 Invalid = true; 6625 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6626 TInfo->getTypeLoc().getBeginLoc()); 6627 } 6628 6629 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6630 LookupName(Previous, S); 6631 6632 // Warn about shadowing the name of a template parameter. 6633 if (Previous.isSingleResult() && 6634 Previous.getFoundDecl()->isTemplateParameter()) { 6635 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6636 Previous.clear(); 6637 } 6638 6639 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6640 "name in alias declaration must be an identifier"); 6641 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6642 Name.StartLocation, 6643 Name.Identifier, TInfo); 6644 6645 NewTD->setAccess(AS); 6646 6647 if (Invalid) 6648 NewTD->setInvalidDecl(); 6649 6650 CheckTypedefForVariablyModifiedType(S, NewTD); 6651 Invalid |= NewTD->isInvalidDecl(); 6652 6653 bool Redeclaration = false; 6654 6655 NamedDecl *NewND; 6656 if (TemplateParamLists.size()) { 6657 TypeAliasTemplateDecl *OldDecl = 0; 6658 TemplateParameterList *OldTemplateParams = 0; 6659 6660 if (TemplateParamLists.size() != 1) { 6661 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6662 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6663 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6664 } 6665 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6666 6667 // Only consider previous declarations in the same scope. 6668 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6669 /*ExplicitInstantiationOrSpecialization*/false); 6670 if (!Previous.empty()) { 6671 Redeclaration = true; 6672 6673 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6674 if (!OldDecl && !Invalid) { 6675 Diag(UsingLoc, diag::err_redefinition_different_kind) 6676 << Name.Identifier; 6677 6678 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6679 if (OldD->getLocation().isValid()) 6680 Diag(OldD->getLocation(), diag::note_previous_definition); 6681 6682 Invalid = true; 6683 } 6684 6685 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6686 if (TemplateParameterListsAreEqual(TemplateParams, 6687 OldDecl->getTemplateParameters(), 6688 /*Complain=*/true, 6689 TPL_TemplateMatch)) 6690 OldTemplateParams = OldDecl->getTemplateParameters(); 6691 else 6692 Invalid = true; 6693 6694 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6695 if (!Invalid && 6696 !Context.hasSameType(OldTD->getUnderlyingType(), 6697 NewTD->getUnderlyingType())) { 6698 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6699 // but we can't reasonably accept it. 6700 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6701 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6702 if (OldTD->getLocation().isValid()) 6703 Diag(OldTD->getLocation(), diag::note_previous_definition); 6704 Invalid = true; 6705 } 6706 } 6707 } 6708 6709 // Merge any previous default template arguments into our parameters, 6710 // and check the parameter list. 6711 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6712 TPC_TypeAliasTemplate)) 6713 return 0; 6714 6715 TypeAliasTemplateDecl *NewDecl = 6716 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6717 Name.Identifier, TemplateParams, 6718 NewTD); 6719 6720 NewDecl->setAccess(AS); 6721 6722 if (Invalid) 6723 NewDecl->setInvalidDecl(); 6724 else if (OldDecl) 6725 NewDecl->setPreviousDeclaration(OldDecl); 6726 6727 NewND = NewDecl; 6728 } else { 6729 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6730 NewND = NewTD; 6731 } 6732 6733 if (!Redeclaration) 6734 PushOnScopeChains(NewND, S); 6735 6736 return NewND; 6737} 6738 6739Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6740 SourceLocation NamespaceLoc, 6741 SourceLocation AliasLoc, 6742 IdentifierInfo *Alias, 6743 CXXScopeSpec &SS, 6744 SourceLocation IdentLoc, 6745 IdentifierInfo *Ident) { 6746 6747 // Lookup the namespace name. 6748 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6749 LookupParsedName(R, S, &SS); 6750 6751 // Check if we have a previous declaration with the same name. 6752 NamedDecl *PrevDecl 6753 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6754 ForRedeclaration); 6755 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6756 PrevDecl = 0; 6757 6758 if (PrevDecl) { 6759 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6760 // We already have an alias with the same name that points to the same 6761 // namespace, so don't create a new one. 6762 // FIXME: At some point, we'll want to create the (redundant) 6763 // declaration to maintain better source information. 6764 if (!R.isAmbiguous() && !R.empty() && 6765 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6766 return 0; 6767 } 6768 6769 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6770 diag::err_redefinition_different_kind; 6771 Diag(AliasLoc, DiagID) << Alias; 6772 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6773 return 0; 6774 } 6775 6776 if (R.isAmbiguous()) 6777 return 0; 6778 6779 if (R.empty()) { 6780 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6781 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6782 return 0; 6783 } 6784 } 6785 6786 NamespaceAliasDecl *AliasDecl = 6787 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6788 Alias, SS.getWithLocInContext(Context), 6789 IdentLoc, R.getFoundDecl()); 6790 6791 PushOnScopeChains(AliasDecl, S); 6792 return AliasDecl; 6793} 6794 6795namespace { 6796 /// \brief Scoped object used to handle the state changes required in Sema 6797 /// to implicitly define the body of a C++ member function; 6798 class ImplicitlyDefinedFunctionScope { 6799 Sema &S; 6800 Sema::ContextRAII SavedContext; 6801 6802 public: 6803 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6804 : S(S), SavedContext(S, Method) 6805 { 6806 S.PushFunctionScope(); 6807 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6808 } 6809 6810 ~ImplicitlyDefinedFunctionScope() { 6811 S.PopExpressionEvaluationContext(); 6812 S.PopFunctionScopeInfo(); 6813 } 6814 }; 6815} 6816 6817Sema::ImplicitExceptionSpecification 6818Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6819 // C++ [except.spec]p14: 6820 // An implicitly declared special member function (Clause 12) shall have an 6821 // exception-specification. [...] 6822 ImplicitExceptionSpecification ExceptSpec(Context); 6823 if (ClassDecl->isInvalidDecl()) 6824 return ExceptSpec; 6825 6826 // Direct base-class constructors. 6827 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6828 BEnd = ClassDecl->bases_end(); 6829 B != BEnd; ++B) { 6830 if (B->isVirtual()) // Handled below. 6831 continue; 6832 6833 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6834 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6835 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6836 // If this is a deleted function, add it anyway. This might be conformant 6837 // with the standard. This might not. I'm not sure. It might not matter. 6838 if (Constructor) 6839 ExceptSpec.CalledDecl(Constructor); 6840 } 6841 } 6842 6843 // Virtual base-class constructors. 6844 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6845 BEnd = ClassDecl->vbases_end(); 6846 B != BEnd; ++B) { 6847 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6848 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6849 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6850 // If this is a deleted function, add it anyway. This might be conformant 6851 // with the standard. This might not. I'm not sure. It might not matter. 6852 if (Constructor) 6853 ExceptSpec.CalledDecl(Constructor); 6854 } 6855 } 6856 6857 // Field constructors. 6858 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6859 FEnd = ClassDecl->field_end(); 6860 F != FEnd; ++F) { 6861 if (F->hasInClassInitializer()) { 6862 if (Expr *E = F->getInClassInitializer()) 6863 ExceptSpec.CalledExpr(E); 6864 else if (!F->isInvalidDecl()) 6865 ExceptSpec.SetDelayed(); 6866 } else if (const RecordType *RecordTy 6867 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6868 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6869 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6870 // If this is a deleted function, add it anyway. This might be conformant 6871 // with the standard. This might not. I'm not sure. It might not matter. 6872 // In particular, the problem is that this function never gets called. It 6873 // might just be ill-formed because this function attempts to refer to 6874 // a deleted function here. 6875 if (Constructor) 6876 ExceptSpec.CalledDecl(Constructor); 6877 } 6878 } 6879 6880 return ExceptSpec; 6881} 6882 6883CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6884 CXXRecordDecl *ClassDecl) { 6885 // C++ [class.ctor]p5: 6886 // A default constructor for a class X is a constructor of class X 6887 // that can be called without an argument. If there is no 6888 // user-declared constructor for class X, a default constructor is 6889 // implicitly declared. An implicitly-declared default constructor 6890 // is an inline public member of its class. 6891 assert(!ClassDecl->hasUserDeclaredConstructor() && 6892 "Should not build implicit default constructor!"); 6893 6894 ImplicitExceptionSpecification Spec = 6895 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6896 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6897 6898 // Create the actual constructor declaration. 6899 CanQualType ClassType 6900 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6901 SourceLocation ClassLoc = ClassDecl->getLocation(); 6902 DeclarationName Name 6903 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6904 DeclarationNameInfo NameInfo(Name, ClassLoc); 6905 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6906 Context, ClassDecl, ClassLoc, NameInfo, 6907 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6908 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6909 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6910 getLangOptions().CPlusPlus0x); 6911 DefaultCon->setAccess(AS_public); 6912 DefaultCon->setDefaulted(); 6913 DefaultCon->setImplicit(); 6914 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6915 6916 // Note that we have declared this constructor. 6917 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6918 6919 if (Scope *S = getScopeForContext(ClassDecl)) 6920 PushOnScopeChains(DefaultCon, S, false); 6921 ClassDecl->addDecl(DefaultCon); 6922 6923 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6924 DefaultCon->setDeletedAsWritten(); 6925 6926 return DefaultCon; 6927} 6928 6929void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6930 CXXConstructorDecl *Constructor) { 6931 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6932 !Constructor->doesThisDeclarationHaveABody() && 6933 !Constructor->isDeleted()) && 6934 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6935 6936 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6937 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6938 6939 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6940 DiagnosticErrorTrap Trap(Diags); 6941 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6942 Trap.hasErrorOccurred()) { 6943 Diag(CurrentLocation, diag::note_member_synthesized_at) 6944 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6945 Constructor->setInvalidDecl(); 6946 return; 6947 } 6948 6949 SourceLocation Loc = Constructor->getLocation(); 6950 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6951 6952 Constructor->setUsed(); 6953 MarkVTableUsed(CurrentLocation, ClassDecl); 6954 6955 if (ASTMutationListener *L = getASTMutationListener()) { 6956 L->CompletedImplicitDefinition(Constructor); 6957 } 6958} 6959 6960/// Get any existing defaulted default constructor for the given class. Do not 6961/// implicitly define one if it does not exist. 6962static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6963 CXXRecordDecl *D) { 6964 ASTContext &Context = Self.Context; 6965 QualType ClassType = Context.getTypeDeclType(D); 6966 DeclarationName ConstructorName 6967 = Context.DeclarationNames.getCXXConstructorName( 6968 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6969 6970 DeclContext::lookup_const_iterator Con, ConEnd; 6971 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6972 Con != ConEnd; ++Con) { 6973 // A function template cannot be defaulted. 6974 if (isa<FunctionTemplateDecl>(*Con)) 6975 continue; 6976 6977 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6978 if (Constructor->isDefaultConstructor()) 6979 return Constructor->isDefaulted() ? Constructor : 0; 6980 } 6981 return 0; 6982} 6983 6984void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6985 if (!D) return; 6986 AdjustDeclIfTemplate(D); 6987 6988 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6989 CXXConstructorDecl *CtorDecl 6990 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6991 6992 if (!CtorDecl) return; 6993 6994 // Compute the exception specification for the default constructor. 6995 const FunctionProtoType *CtorTy = 6996 CtorDecl->getType()->castAs<FunctionProtoType>(); 6997 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6998 ImplicitExceptionSpecification Spec = 6999 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7000 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7001 assert(EPI.ExceptionSpecType != EST_Delayed); 7002 7003 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7004 } 7005 7006 // If the default constructor is explicitly defaulted, checking the exception 7007 // specification is deferred until now. 7008 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7009 !ClassDecl->isDependentType()) 7010 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7011} 7012 7013void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7014 // We start with an initial pass over the base classes to collect those that 7015 // inherit constructors from. If there are none, we can forgo all further 7016 // processing. 7017 typedef SmallVector<const RecordType *, 4> BasesVector; 7018 BasesVector BasesToInheritFrom; 7019 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7020 BaseE = ClassDecl->bases_end(); 7021 BaseIt != BaseE; ++BaseIt) { 7022 if (BaseIt->getInheritConstructors()) { 7023 QualType Base = BaseIt->getType(); 7024 if (Base->isDependentType()) { 7025 // If we inherit constructors from anything that is dependent, just 7026 // abort processing altogether. We'll get another chance for the 7027 // instantiations. 7028 return; 7029 } 7030 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7031 } 7032 } 7033 if (BasesToInheritFrom.empty()) 7034 return; 7035 7036 // Now collect the constructors that we already have in the current class. 7037 // Those take precedence over inherited constructors. 7038 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7039 // unless there is a user-declared constructor with the same signature in 7040 // the class where the using-declaration appears. 7041 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7042 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7043 CtorE = ClassDecl->ctor_end(); 7044 CtorIt != CtorE; ++CtorIt) { 7045 ExistingConstructors.insert( 7046 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7047 } 7048 7049 Scope *S = getScopeForContext(ClassDecl); 7050 DeclarationName CreatedCtorName = 7051 Context.DeclarationNames.getCXXConstructorName( 7052 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7053 7054 // Now comes the true work. 7055 // First, we keep a map from constructor types to the base that introduced 7056 // them. Needed for finding conflicting constructors. We also keep the 7057 // actually inserted declarations in there, for pretty diagnostics. 7058 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7059 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7060 ConstructorToSourceMap InheritedConstructors; 7061 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7062 BaseE = BasesToInheritFrom.end(); 7063 BaseIt != BaseE; ++BaseIt) { 7064 const RecordType *Base = *BaseIt; 7065 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7066 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7067 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7068 CtorE = BaseDecl->ctor_end(); 7069 CtorIt != CtorE; ++CtorIt) { 7070 // Find the using declaration for inheriting this base's constructors. 7071 DeclarationName Name = 7072 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7073 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7074 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7075 SourceLocation UsingLoc = UD ? UD->getLocation() : 7076 ClassDecl->getLocation(); 7077 7078 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7079 // from the class X named in the using-declaration consists of actual 7080 // constructors and notional constructors that result from the 7081 // transformation of defaulted parameters as follows: 7082 // - all non-template default constructors of X, and 7083 // - for each non-template constructor of X that has at least one 7084 // parameter with a default argument, the set of constructors that 7085 // results from omitting any ellipsis parameter specification and 7086 // successively omitting parameters with a default argument from the 7087 // end of the parameter-type-list. 7088 CXXConstructorDecl *BaseCtor = *CtorIt; 7089 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7090 const FunctionProtoType *BaseCtorType = 7091 BaseCtor->getType()->getAs<FunctionProtoType>(); 7092 7093 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7094 maxParams = BaseCtor->getNumParams(); 7095 params <= maxParams; ++params) { 7096 // Skip default constructors. They're never inherited. 7097 if (params == 0) 7098 continue; 7099 // Skip copy and move constructors for the same reason. 7100 if (CanBeCopyOrMove && params == 1) 7101 continue; 7102 7103 // Build up a function type for this particular constructor. 7104 // FIXME: The working paper does not consider that the exception spec 7105 // for the inheriting constructor might be larger than that of the 7106 // source. This code doesn't yet, either. When it does, this code will 7107 // need to be delayed until after exception specifications and in-class 7108 // member initializers are attached. 7109 const Type *NewCtorType; 7110 if (params == maxParams) 7111 NewCtorType = BaseCtorType; 7112 else { 7113 SmallVector<QualType, 16> Args; 7114 for (unsigned i = 0; i < params; ++i) { 7115 Args.push_back(BaseCtorType->getArgType(i)); 7116 } 7117 FunctionProtoType::ExtProtoInfo ExtInfo = 7118 BaseCtorType->getExtProtoInfo(); 7119 ExtInfo.Variadic = false; 7120 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7121 Args.data(), params, ExtInfo) 7122 .getTypePtr(); 7123 } 7124 const Type *CanonicalNewCtorType = 7125 Context.getCanonicalType(NewCtorType); 7126 7127 // Now that we have the type, first check if the class already has a 7128 // constructor with this signature. 7129 if (ExistingConstructors.count(CanonicalNewCtorType)) 7130 continue; 7131 7132 // Then we check if we have already declared an inherited constructor 7133 // with this signature. 7134 std::pair<ConstructorToSourceMap::iterator, bool> result = 7135 InheritedConstructors.insert(std::make_pair( 7136 CanonicalNewCtorType, 7137 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7138 if (!result.second) { 7139 // Already in the map. If it came from a different class, that's an 7140 // error. Not if it's from the same. 7141 CanQualType PreviousBase = result.first->second.first; 7142 if (CanonicalBase != PreviousBase) { 7143 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7144 const CXXConstructorDecl *PrevBaseCtor = 7145 PrevCtor->getInheritedConstructor(); 7146 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7147 7148 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7149 Diag(BaseCtor->getLocation(), 7150 diag::note_using_decl_constructor_conflict_current_ctor); 7151 Diag(PrevBaseCtor->getLocation(), 7152 diag::note_using_decl_constructor_conflict_previous_ctor); 7153 Diag(PrevCtor->getLocation(), 7154 diag::note_using_decl_constructor_conflict_previous_using); 7155 } 7156 continue; 7157 } 7158 7159 // OK, we're there, now add the constructor. 7160 // C++0x [class.inhctor]p8: [...] that would be performed by a 7161 // user-written inline constructor [...] 7162 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7163 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7164 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7165 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7166 /*ImplicitlyDeclared=*/true, 7167 // FIXME: Due to a defect in the standard, we treat inherited 7168 // constructors as constexpr even if that makes them ill-formed. 7169 /*Constexpr=*/BaseCtor->isConstexpr()); 7170 NewCtor->setAccess(BaseCtor->getAccess()); 7171 7172 // Build up the parameter decls and add them. 7173 SmallVector<ParmVarDecl *, 16> ParamDecls; 7174 for (unsigned i = 0; i < params; ++i) { 7175 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7176 UsingLoc, UsingLoc, 7177 /*IdentifierInfo=*/0, 7178 BaseCtorType->getArgType(i), 7179 /*TInfo=*/0, SC_None, 7180 SC_None, /*DefaultArg=*/0)); 7181 } 7182 NewCtor->setParams(ParamDecls); 7183 NewCtor->setInheritedConstructor(BaseCtor); 7184 7185 PushOnScopeChains(NewCtor, S, false); 7186 ClassDecl->addDecl(NewCtor); 7187 result.first->second.second = NewCtor; 7188 } 7189 } 7190 } 7191} 7192 7193Sema::ImplicitExceptionSpecification 7194Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7195 // C++ [except.spec]p14: 7196 // An implicitly declared special member function (Clause 12) shall have 7197 // an exception-specification. 7198 ImplicitExceptionSpecification ExceptSpec(Context); 7199 if (ClassDecl->isInvalidDecl()) 7200 return ExceptSpec; 7201 7202 // Direct base-class destructors. 7203 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7204 BEnd = ClassDecl->bases_end(); 7205 B != BEnd; ++B) { 7206 if (B->isVirtual()) // Handled below. 7207 continue; 7208 7209 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7210 ExceptSpec.CalledDecl( 7211 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7212 } 7213 7214 // Virtual base-class destructors. 7215 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7216 BEnd = ClassDecl->vbases_end(); 7217 B != BEnd; ++B) { 7218 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7219 ExceptSpec.CalledDecl( 7220 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7221 } 7222 7223 // Field destructors. 7224 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7225 FEnd = ClassDecl->field_end(); 7226 F != FEnd; ++F) { 7227 if (const RecordType *RecordTy 7228 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7229 ExceptSpec.CalledDecl( 7230 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7231 } 7232 7233 return ExceptSpec; 7234} 7235 7236CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7237 // C++ [class.dtor]p2: 7238 // If a class has no user-declared destructor, a destructor is 7239 // declared implicitly. An implicitly-declared destructor is an 7240 // inline public member of its class. 7241 7242 ImplicitExceptionSpecification Spec = 7243 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7244 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7245 7246 // Create the actual destructor declaration. 7247 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7248 7249 CanQualType ClassType 7250 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7251 SourceLocation ClassLoc = ClassDecl->getLocation(); 7252 DeclarationName Name 7253 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7254 DeclarationNameInfo NameInfo(Name, ClassLoc); 7255 CXXDestructorDecl *Destructor 7256 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7257 /*isInline=*/true, 7258 /*isImplicitlyDeclared=*/true); 7259 Destructor->setAccess(AS_public); 7260 Destructor->setDefaulted(); 7261 Destructor->setImplicit(); 7262 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7263 7264 // Note that we have declared this destructor. 7265 ++ASTContext::NumImplicitDestructorsDeclared; 7266 7267 // Introduce this destructor into its scope. 7268 if (Scope *S = getScopeForContext(ClassDecl)) 7269 PushOnScopeChains(Destructor, S, false); 7270 ClassDecl->addDecl(Destructor); 7271 7272 // This could be uniqued if it ever proves significant. 7273 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7274 7275 if (ShouldDeleteDestructor(Destructor)) 7276 Destructor->setDeletedAsWritten(); 7277 7278 AddOverriddenMethods(ClassDecl, Destructor); 7279 7280 return Destructor; 7281} 7282 7283void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7284 CXXDestructorDecl *Destructor) { 7285 assert((Destructor->isDefaulted() && 7286 !Destructor->doesThisDeclarationHaveABody()) && 7287 "DefineImplicitDestructor - call it for implicit default dtor"); 7288 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7289 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7290 7291 if (Destructor->isInvalidDecl()) 7292 return; 7293 7294 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7295 7296 DiagnosticErrorTrap Trap(Diags); 7297 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7298 Destructor->getParent()); 7299 7300 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7301 Diag(CurrentLocation, diag::note_member_synthesized_at) 7302 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7303 7304 Destructor->setInvalidDecl(); 7305 return; 7306 } 7307 7308 SourceLocation Loc = Destructor->getLocation(); 7309 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7310 Destructor->setImplicitlyDefined(true); 7311 Destructor->setUsed(); 7312 MarkVTableUsed(CurrentLocation, ClassDecl); 7313 7314 if (ASTMutationListener *L = getASTMutationListener()) { 7315 L->CompletedImplicitDefinition(Destructor); 7316 } 7317} 7318 7319void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7320 CXXDestructorDecl *destructor) { 7321 // C++11 [class.dtor]p3: 7322 // A declaration of a destructor that does not have an exception- 7323 // specification is implicitly considered to have the same exception- 7324 // specification as an implicit declaration. 7325 const FunctionProtoType *dtorType = destructor->getType()-> 7326 getAs<FunctionProtoType>(); 7327 if (dtorType->hasExceptionSpec()) 7328 return; 7329 7330 ImplicitExceptionSpecification exceptSpec = 7331 ComputeDefaultedDtorExceptionSpec(classDecl); 7332 7333 // Replace the destructor's type, building off the existing one. Fortunately, 7334 // the only thing of interest in the destructor type is its extended info. 7335 // The return and arguments are fixed. 7336 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7337 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7338 epi.NumExceptions = exceptSpec.size(); 7339 epi.Exceptions = exceptSpec.data(); 7340 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7341 7342 destructor->setType(ty); 7343 7344 // FIXME: If the destructor has a body that could throw, and the newly created 7345 // spec doesn't allow exceptions, we should emit a warning, because this 7346 // change in behavior can break conforming C++03 programs at runtime. 7347 // However, we don't have a body yet, so it needs to be done somewhere else. 7348} 7349 7350/// \brief Builds a statement that copies/moves the given entity from \p From to 7351/// \c To. 7352/// 7353/// This routine is used to copy/move the members of a class with an 7354/// implicitly-declared copy/move assignment operator. When the entities being 7355/// copied are arrays, this routine builds for loops to copy them. 7356/// 7357/// \param S The Sema object used for type-checking. 7358/// 7359/// \param Loc The location where the implicit copy/move is being generated. 7360/// 7361/// \param T The type of the expressions being copied/moved. Both expressions 7362/// must have this type. 7363/// 7364/// \param To The expression we are copying/moving to. 7365/// 7366/// \param From The expression we are copying/moving from. 7367/// 7368/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7369/// Otherwise, it's a non-static member subobject. 7370/// 7371/// \param Copying Whether we're copying or moving. 7372/// 7373/// \param Depth Internal parameter recording the depth of the recursion. 7374/// 7375/// \returns A statement or a loop that copies the expressions. 7376static StmtResult 7377BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7378 Expr *To, Expr *From, 7379 bool CopyingBaseSubobject, bool Copying, 7380 unsigned Depth = 0) { 7381 // C++0x [class.copy]p28: 7382 // Each subobject is assigned in the manner appropriate to its type: 7383 // 7384 // - if the subobject is of class type, as if by a call to operator= with 7385 // the subobject as the object expression and the corresponding 7386 // subobject of x as a single function argument (as if by explicit 7387 // qualification; that is, ignoring any possible virtual overriding 7388 // functions in more derived classes); 7389 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7390 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7391 7392 // Look for operator=. 7393 DeclarationName Name 7394 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7395 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7396 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7397 7398 // Filter out any result that isn't a copy/move-assignment operator. 7399 LookupResult::Filter F = OpLookup.makeFilter(); 7400 while (F.hasNext()) { 7401 NamedDecl *D = F.next(); 7402 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7403 if (Copying ? Method->isCopyAssignmentOperator() : 7404 Method->isMoveAssignmentOperator()) 7405 continue; 7406 7407 F.erase(); 7408 } 7409 F.done(); 7410 7411 // Suppress the protected check (C++ [class.protected]) for each of the 7412 // assignment operators we found. This strange dance is required when 7413 // we're assigning via a base classes's copy-assignment operator. To 7414 // ensure that we're getting the right base class subobject (without 7415 // ambiguities), we need to cast "this" to that subobject type; to 7416 // ensure that we don't go through the virtual call mechanism, we need 7417 // to qualify the operator= name with the base class (see below). However, 7418 // this means that if the base class has a protected copy assignment 7419 // operator, the protected member access check will fail. So, we 7420 // rewrite "protected" access to "public" access in this case, since we 7421 // know by construction that we're calling from a derived class. 7422 if (CopyingBaseSubobject) { 7423 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7424 L != LEnd; ++L) { 7425 if (L.getAccess() == AS_protected) 7426 L.setAccess(AS_public); 7427 } 7428 } 7429 7430 // Create the nested-name-specifier that will be used to qualify the 7431 // reference to operator=; this is required to suppress the virtual 7432 // call mechanism. 7433 CXXScopeSpec SS; 7434 SS.MakeTrivial(S.Context, 7435 NestedNameSpecifier::Create(S.Context, 0, false, 7436 T.getTypePtr()), 7437 Loc); 7438 7439 // Create the reference to operator=. 7440 ExprResult OpEqualRef 7441 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7442 /*FirstQualifierInScope=*/0, OpLookup, 7443 /*TemplateArgs=*/0, 7444 /*SuppressQualifierCheck=*/true); 7445 if (OpEqualRef.isInvalid()) 7446 return StmtError(); 7447 7448 // Build the call to the assignment operator. 7449 7450 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7451 OpEqualRef.takeAs<Expr>(), 7452 Loc, &From, 1, Loc); 7453 if (Call.isInvalid()) 7454 return StmtError(); 7455 7456 return S.Owned(Call.takeAs<Stmt>()); 7457 } 7458 7459 // - if the subobject is of scalar type, the built-in assignment 7460 // operator is used. 7461 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7462 if (!ArrayTy) { 7463 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7464 if (Assignment.isInvalid()) 7465 return StmtError(); 7466 7467 return S.Owned(Assignment.takeAs<Stmt>()); 7468 } 7469 7470 // - if the subobject is an array, each element is assigned, in the 7471 // manner appropriate to the element type; 7472 7473 // Construct a loop over the array bounds, e.g., 7474 // 7475 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7476 // 7477 // that will copy each of the array elements. 7478 QualType SizeType = S.Context.getSizeType(); 7479 7480 // Create the iteration variable. 7481 IdentifierInfo *IterationVarName = 0; 7482 { 7483 llvm::SmallString<8> Str; 7484 llvm::raw_svector_ostream OS(Str); 7485 OS << "__i" << Depth; 7486 IterationVarName = &S.Context.Idents.get(OS.str()); 7487 } 7488 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7489 IterationVarName, SizeType, 7490 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7491 SC_None, SC_None); 7492 7493 // Initialize the iteration variable to zero. 7494 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7495 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7496 7497 // Create a reference to the iteration variable; we'll use this several 7498 // times throughout. 7499 Expr *IterationVarRef 7500 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7501 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7502 7503 // Create the DeclStmt that holds the iteration variable. 7504 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7505 7506 // Create the comparison against the array bound. 7507 llvm::APInt Upper 7508 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7509 Expr *Comparison 7510 = new (S.Context) BinaryOperator(IterationVarRef, 7511 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7512 BO_NE, S.Context.BoolTy, 7513 VK_RValue, OK_Ordinary, Loc); 7514 7515 // Create the pre-increment of the iteration variable. 7516 Expr *Increment 7517 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7518 VK_LValue, OK_Ordinary, Loc); 7519 7520 // Subscript the "from" and "to" expressions with the iteration variable. 7521 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7522 IterationVarRef, Loc)); 7523 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7524 IterationVarRef, Loc)); 7525 if (!Copying) // Cast to rvalue 7526 From = CastForMoving(S, From); 7527 7528 // Build the copy/move for an individual element of the array. 7529 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7530 To, From, CopyingBaseSubobject, 7531 Copying, Depth + 1); 7532 if (Copy.isInvalid()) 7533 return StmtError(); 7534 7535 // Construct the loop that copies all elements of this array. 7536 return S.ActOnForStmt(Loc, Loc, InitStmt, 7537 S.MakeFullExpr(Comparison), 7538 0, S.MakeFullExpr(Increment), 7539 Loc, Copy.take()); 7540} 7541 7542std::pair<Sema::ImplicitExceptionSpecification, bool> 7543Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7544 CXXRecordDecl *ClassDecl) { 7545 if (ClassDecl->isInvalidDecl()) 7546 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7547 7548 // C++ [class.copy]p10: 7549 // If the class definition does not explicitly declare a copy 7550 // assignment operator, one is declared implicitly. 7551 // The implicitly-defined copy assignment operator for a class X 7552 // will have the form 7553 // 7554 // X& X::operator=(const X&) 7555 // 7556 // if 7557 bool HasConstCopyAssignment = true; 7558 7559 // -- each direct base class B of X has a copy assignment operator 7560 // whose parameter is of type const B&, const volatile B& or B, 7561 // and 7562 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7563 BaseEnd = ClassDecl->bases_end(); 7564 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7565 // We'll handle this below 7566 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7567 continue; 7568 7569 assert(!Base->getType()->isDependentType() && 7570 "Cannot generate implicit members for class with dependent bases."); 7571 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7572 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7573 &HasConstCopyAssignment); 7574 } 7575 7576 // In C++11, the above citation has "or virtual" added 7577 if (LangOpts.CPlusPlus0x) { 7578 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7579 BaseEnd = ClassDecl->vbases_end(); 7580 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7581 assert(!Base->getType()->isDependentType() && 7582 "Cannot generate implicit members for class with dependent bases."); 7583 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7584 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7585 &HasConstCopyAssignment); 7586 } 7587 } 7588 7589 // -- for all the nonstatic data members of X that are of a class 7590 // type M (or array thereof), each such class type has a copy 7591 // assignment operator whose parameter is of type const M&, 7592 // const volatile M& or M. 7593 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7594 FieldEnd = ClassDecl->field_end(); 7595 HasConstCopyAssignment && Field != FieldEnd; 7596 ++Field) { 7597 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7598 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7599 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7600 &HasConstCopyAssignment); 7601 } 7602 } 7603 7604 // Otherwise, the implicitly declared copy assignment operator will 7605 // have the form 7606 // 7607 // X& X::operator=(X&) 7608 7609 // C++ [except.spec]p14: 7610 // An implicitly declared special member function (Clause 12) shall have an 7611 // exception-specification. [...] 7612 7613 // It is unspecified whether or not an implicit copy assignment operator 7614 // attempts to deduplicate calls to assignment operators of virtual bases are 7615 // made. As such, this exception specification is effectively unspecified. 7616 // Based on a similar decision made for constness in C++0x, we're erring on 7617 // the side of assuming such calls to be made regardless of whether they 7618 // actually happen. 7619 ImplicitExceptionSpecification ExceptSpec(Context); 7620 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7621 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7622 BaseEnd = ClassDecl->bases_end(); 7623 Base != BaseEnd; ++Base) { 7624 if (Base->isVirtual()) 7625 continue; 7626 7627 CXXRecordDecl *BaseClassDecl 7628 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7629 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7630 ArgQuals, false, 0)) 7631 ExceptSpec.CalledDecl(CopyAssign); 7632 } 7633 7634 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7635 BaseEnd = ClassDecl->vbases_end(); 7636 Base != BaseEnd; ++Base) { 7637 CXXRecordDecl *BaseClassDecl 7638 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7639 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7640 ArgQuals, false, 0)) 7641 ExceptSpec.CalledDecl(CopyAssign); 7642 } 7643 7644 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7645 FieldEnd = ClassDecl->field_end(); 7646 Field != FieldEnd; 7647 ++Field) { 7648 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7649 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7650 if (CXXMethodDecl *CopyAssign = 7651 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7652 ExceptSpec.CalledDecl(CopyAssign); 7653 } 7654 } 7655 7656 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7657} 7658 7659CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7660 // Note: The following rules are largely analoguous to the copy 7661 // constructor rules. Note that virtual bases are not taken into account 7662 // for determining the argument type of the operator. Note also that 7663 // operators taking an object instead of a reference are allowed. 7664 7665 ImplicitExceptionSpecification Spec(Context); 7666 bool Const; 7667 llvm::tie(Spec, Const) = 7668 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7669 7670 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7671 QualType RetType = Context.getLValueReferenceType(ArgType); 7672 if (Const) 7673 ArgType = ArgType.withConst(); 7674 ArgType = Context.getLValueReferenceType(ArgType); 7675 7676 // An implicitly-declared copy assignment operator is an inline public 7677 // member of its class. 7678 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7679 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7680 SourceLocation ClassLoc = ClassDecl->getLocation(); 7681 DeclarationNameInfo NameInfo(Name, ClassLoc); 7682 CXXMethodDecl *CopyAssignment 7683 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7684 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7685 /*TInfo=*/0, /*isStatic=*/false, 7686 /*StorageClassAsWritten=*/SC_None, 7687 /*isInline=*/true, /*isConstexpr=*/false, 7688 SourceLocation()); 7689 CopyAssignment->setAccess(AS_public); 7690 CopyAssignment->setDefaulted(); 7691 CopyAssignment->setImplicit(); 7692 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7693 7694 // Add the parameter to the operator. 7695 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7696 ClassLoc, ClassLoc, /*Id=*/0, 7697 ArgType, /*TInfo=*/0, 7698 SC_None, 7699 SC_None, 0); 7700 CopyAssignment->setParams(FromParam); 7701 7702 // Note that we have added this copy-assignment operator. 7703 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7704 7705 if (Scope *S = getScopeForContext(ClassDecl)) 7706 PushOnScopeChains(CopyAssignment, S, false); 7707 ClassDecl->addDecl(CopyAssignment); 7708 7709 // C++0x [class.copy]p18: 7710 // ... If the class definition declares a move constructor or move 7711 // assignment operator, the implicitly declared copy assignment operator is 7712 // defined as deleted; ... 7713 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7714 ClassDecl->hasUserDeclaredMoveAssignment() || 7715 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7716 CopyAssignment->setDeletedAsWritten(); 7717 7718 AddOverriddenMethods(ClassDecl, CopyAssignment); 7719 return CopyAssignment; 7720} 7721 7722void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7723 CXXMethodDecl *CopyAssignOperator) { 7724 assert((CopyAssignOperator->isDefaulted() && 7725 CopyAssignOperator->isOverloadedOperator() && 7726 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7727 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7728 "DefineImplicitCopyAssignment called for wrong function"); 7729 7730 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7731 7732 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7733 CopyAssignOperator->setInvalidDecl(); 7734 return; 7735 } 7736 7737 CopyAssignOperator->setUsed(); 7738 7739 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7740 DiagnosticErrorTrap Trap(Diags); 7741 7742 // C++0x [class.copy]p30: 7743 // The implicitly-defined or explicitly-defaulted copy assignment operator 7744 // for a non-union class X performs memberwise copy assignment of its 7745 // subobjects. The direct base classes of X are assigned first, in the 7746 // order of their declaration in the base-specifier-list, and then the 7747 // immediate non-static data members of X are assigned, in the order in 7748 // which they were declared in the class definition. 7749 7750 // The statements that form the synthesized function body. 7751 ASTOwningVector<Stmt*> Statements(*this); 7752 7753 // The parameter for the "other" object, which we are copying from. 7754 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7755 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7756 QualType OtherRefType = Other->getType(); 7757 if (const LValueReferenceType *OtherRef 7758 = OtherRefType->getAs<LValueReferenceType>()) { 7759 OtherRefType = OtherRef->getPointeeType(); 7760 OtherQuals = OtherRefType.getQualifiers(); 7761 } 7762 7763 // Our location for everything implicitly-generated. 7764 SourceLocation Loc = CopyAssignOperator->getLocation(); 7765 7766 // Construct a reference to the "other" object. We'll be using this 7767 // throughout the generated ASTs. 7768 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7769 assert(OtherRef && "Reference to parameter cannot fail!"); 7770 7771 // Construct the "this" pointer. We'll be using this throughout the generated 7772 // ASTs. 7773 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7774 assert(This && "Reference to this cannot fail!"); 7775 7776 // Assign base classes. 7777 bool Invalid = false; 7778 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7779 E = ClassDecl->bases_end(); Base != E; ++Base) { 7780 // Form the assignment: 7781 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7782 QualType BaseType = Base->getType().getUnqualifiedType(); 7783 if (!BaseType->isRecordType()) { 7784 Invalid = true; 7785 continue; 7786 } 7787 7788 CXXCastPath BasePath; 7789 BasePath.push_back(Base); 7790 7791 // Construct the "from" expression, which is an implicit cast to the 7792 // appropriately-qualified base type. 7793 Expr *From = OtherRef; 7794 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7795 CK_UncheckedDerivedToBase, 7796 VK_LValue, &BasePath).take(); 7797 7798 // Dereference "this". 7799 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7800 7801 // Implicitly cast "this" to the appropriately-qualified base type. 7802 To = ImpCastExprToType(To.take(), 7803 Context.getCVRQualifiedType(BaseType, 7804 CopyAssignOperator->getTypeQualifiers()), 7805 CK_UncheckedDerivedToBase, 7806 VK_LValue, &BasePath); 7807 7808 // Build the copy. 7809 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7810 To.get(), From, 7811 /*CopyingBaseSubobject=*/true, 7812 /*Copying=*/true); 7813 if (Copy.isInvalid()) { 7814 Diag(CurrentLocation, diag::note_member_synthesized_at) 7815 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7816 CopyAssignOperator->setInvalidDecl(); 7817 return; 7818 } 7819 7820 // Success! Record the copy. 7821 Statements.push_back(Copy.takeAs<Expr>()); 7822 } 7823 7824 // \brief Reference to the __builtin_memcpy function. 7825 Expr *BuiltinMemCpyRef = 0; 7826 // \brief Reference to the __builtin_objc_memmove_collectable function. 7827 Expr *CollectableMemCpyRef = 0; 7828 7829 // Assign non-static members. 7830 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7831 FieldEnd = ClassDecl->field_end(); 7832 Field != FieldEnd; ++Field) { 7833 if (Field->isUnnamedBitfield()) 7834 continue; 7835 7836 // Check for members of reference type; we can't copy those. 7837 if (Field->getType()->isReferenceType()) { 7838 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7839 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7840 Diag(Field->getLocation(), diag::note_declared_at); 7841 Diag(CurrentLocation, diag::note_member_synthesized_at) 7842 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7843 Invalid = true; 7844 continue; 7845 } 7846 7847 // Check for members of const-qualified, non-class type. 7848 QualType BaseType = Context.getBaseElementType(Field->getType()); 7849 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7850 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7851 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7852 Diag(Field->getLocation(), diag::note_declared_at); 7853 Diag(CurrentLocation, diag::note_member_synthesized_at) 7854 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7855 Invalid = true; 7856 continue; 7857 } 7858 7859 // Suppress assigning zero-width bitfields. 7860 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7861 continue; 7862 7863 QualType FieldType = Field->getType().getNonReferenceType(); 7864 if (FieldType->isIncompleteArrayType()) { 7865 assert(ClassDecl->hasFlexibleArrayMember() && 7866 "Incomplete array type is not valid"); 7867 continue; 7868 } 7869 7870 // Build references to the field in the object we're copying from and to. 7871 CXXScopeSpec SS; // Intentionally empty 7872 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7873 LookupMemberName); 7874 MemberLookup.addDecl(*Field); 7875 MemberLookup.resolveKind(); 7876 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7877 Loc, /*IsArrow=*/false, 7878 SS, 0, MemberLookup, 0); 7879 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7880 Loc, /*IsArrow=*/true, 7881 SS, 0, MemberLookup, 0); 7882 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7883 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7884 7885 // If the field should be copied with __builtin_memcpy rather than via 7886 // explicit assignments, do so. This optimization only applies for arrays 7887 // of scalars and arrays of class type with trivial copy-assignment 7888 // operators. 7889 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7890 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7891 // Compute the size of the memory buffer to be copied. 7892 QualType SizeType = Context.getSizeType(); 7893 llvm::APInt Size(Context.getTypeSize(SizeType), 7894 Context.getTypeSizeInChars(BaseType).getQuantity()); 7895 for (const ConstantArrayType *Array 7896 = Context.getAsConstantArrayType(FieldType); 7897 Array; 7898 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7899 llvm::APInt ArraySize 7900 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7901 Size *= ArraySize; 7902 } 7903 7904 // Take the address of the field references for "from" and "to". 7905 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7906 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7907 7908 bool NeedsCollectableMemCpy = 7909 (BaseType->isRecordType() && 7910 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7911 7912 if (NeedsCollectableMemCpy) { 7913 if (!CollectableMemCpyRef) { 7914 // Create a reference to the __builtin_objc_memmove_collectable function. 7915 LookupResult R(*this, 7916 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7917 Loc, LookupOrdinaryName); 7918 LookupName(R, TUScope, true); 7919 7920 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7921 if (!CollectableMemCpy) { 7922 // Something went horribly wrong earlier, and we will have 7923 // complained about it. 7924 Invalid = true; 7925 continue; 7926 } 7927 7928 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7929 CollectableMemCpy->getType(), 7930 VK_LValue, Loc, 0).take(); 7931 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7932 } 7933 } 7934 // Create a reference to the __builtin_memcpy builtin function. 7935 else if (!BuiltinMemCpyRef) { 7936 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7937 LookupOrdinaryName); 7938 LookupName(R, TUScope, true); 7939 7940 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7941 if (!BuiltinMemCpy) { 7942 // Something went horribly wrong earlier, and we will have complained 7943 // about it. 7944 Invalid = true; 7945 continue; 7946 } 7947 7948 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7949 BuiltinMemCpy->getType(), 7950 VK_LValue, Loc, 0).take(); 7951 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7952 } 7953 7954 ASTOwningVector<Expr*> CallArgs(*this); 7955 CallArgs.push_back(To.takeAs<Expr>()); 7956 CallArgs.push_back(From.takeAs<Expr>()); 7957 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7958 ExprResult Call = ExprError(); 7959 if (NeedsCollectableMemCpy) 7960 Call = ActOnCallExpr(/*Scope=*/0, 7961 CollectableMemCpyRef, 7962 Loc, move_arg(CallArgs), 7963 Loc); 7964 else 7965 Call = ActOnCallExpr(/*Scope=*/0, 7966 BuiltinMemCpyRef, 7967 Loc, move_arg(CallArgs), 7968 Loc); 7969 7970 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7971 Statements.push_back(Call.takeAs<Expr>()); 7972 continue; 7973 } 7974 7975 // Build the copy of this field. 7976 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7977 To.get(), From.get(), 7978 /*CopyingBaseSubobject=*/false, 7979 /*Copying=*/true); 7980 if (Copy.isInvalid()) { 7981 Diag(CurrentLocation, diag::note_member_synthesized_at) 7982 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7983 CopyAssignOperator->setInvalidDecl(); 7984 return; 7985 } 7986 7987 // Success! Record the copy. 7988 Statements.push_back(Copy.takeAs<Stmt>()); 7989 } 7990 7991 if (!Invalid) { 7992 // Add a "return *this;" 7993 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7994 7995 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7996 if (Return.isInvalid()) 7997 Invalid = true; 7998 else { 7999 Statements.push_back(Return.takeAs<Stmt>()); 8000 8001 if (Trap.hasErrorOccurred()) { 8002 Diag(CurrentLocation, diag::note_member_synthesized_at) 8003 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8004 Invalid = true; 8005 } 8006 } 8007 } 8008 8009 if (Invalid) { 8010 CopyAssignOperator->setInvalidDecl(); 8011 return; 8012 } 8013 8014 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8015 /*isStmtExpr=*/false); 8016 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8017 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8018 8019 if (ASTMutationListener *L = getASTMutationListener()) { 8020 L->CompletedImplicitDefinition(CopyAssignOperator); 8021 } 8022} 8023 8024Sema::ImplicitExceptionSpecification 8025Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8026 ImplicitExceptionSpecification ExceptSpec(Context); 8027 8028 if (ClassDecl->isInvalidDecl()) 8029 return ExceptSpec; 8030 8031 // C++0x [except.spec]p14: 8032 // An implicitly declared special member function (Clause 12) shall have an 8033 // exception-specification. [...] 8034 8035 // It is unspecified whether or not an implicit move assignment operator 8036 // attempts to deduplicate calls to assignment operators of virtual bases are 8037 // made. As such, this exception specification is effectively unspecified. 8038 // Based on a similar decision made for constness in C++0x, we're erring on 8039 // the side of assuming such calls to be made regardless of whether they 8040 // actually happen. 8041 // Note that a move constructor is not implicitly declared when there are 8042 // virtual bases, but it can still be user-declared and explicitly defaulted. 8043 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8044 BaseEnd = ClassDecl->bases_end(); 8045 Base != BaseEnd; ++Base) { 8046 if (Base->isVirtual()) 8047 continue; 8048 8049 CXXRecordDecl *BaseClassDecl 8050 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8051 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8052 false, 0)) 8053 ExceptSpec.CalledDecl(MoveAssign); 8054 } 8055 8056 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8057 BaseEnd = ClassDecl->vbases_end(); 8058 Base != BaseEnd; ++Base) { 8059 CXXRecordDecl *BaseClassDecl 8060 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8061 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8062 false, 0)) 8063 ExceptSpec.CalledDecl(MoveAssign); 8064 } 8065 8066 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8067 FieldEnd = ClassDecl->field_end(); 8068 Field != FieldEnd; 8069 ++Field) { 8070 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8071 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8072 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8073 false, 0)) 8074 ExceptSpec.CalledDecl(MoveAssign); 8075 } 8076 } 8077 8078 return ExceptSpec; 8079} 8080 8081CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8082 // Note: The following rules are largely analoguous to the move 8083 // constructor rules. 8084 8085 ImplicitExceptionSpecification Spec( 8086 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8087 8088 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8089 QualType RetType = Context.getLValueReferenceType(ArgType); 8090 ArgType = Context.getRValueReferenceType(ArgType); 8091 8092 // An implicitly-declared move assignment operator is an inline public 8093 // member of its class. 8094 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8095 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8096 SourceLocation ClassLoc = ClassDecl->getLocation(); 8097 DeclarationNameInfo NameInfo(Name, ClassLoc); 8098 CXXMethodDecl *MoveAssignment 8099 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8100 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8101 /*TInfo=*/0, /*isStatic=*/false, 8102 /*StorageClassAsWritten=*/SC_None, 8103 /*isInline=*/true, 8104 /*isConstexpr=*/false, 8105 SourceLocation()); 8106 MoveAssignment->setAccess(AS_public); 8107 MoveAssignment->setDefaulted(); 8108 MoveAssignment->setImplicit(); 8109 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8110 8111 // Add the parameter to the operator. 8112 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8113 ClassLoc, ClassLoc, /*Id=*/0, 8114 ArgType, /*TInfo=*/0, 8115 SC_None, 8116 SC_None, 0); 8117 MoveAssignment->setParams(FromParam); 8118 8119 // Note that we have added this copy-assignment operator. 8120 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8121 8122 // C++0x [class.copy]p9: 8123 // If the definition of a class X does not explicitly declare a move 8124 // assignment operator, one will be implicitly declared as defaulted if and 8125 // only if: 8126 // [...] 8127 // - the move assignment operator would not be implicitly defined as 8128 // deleted. 8129 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8130 // Cache this result so that we don't try to generate this over and over 8131 // on every lookup, leaking memory and wasting time. 8132 ClassDecl->setFailedImplicitMoveAssignment(); 8133 return 0; 8134 } 8135 8136 if (Scope *S = getScopeForContext(ClassDecl)) 8137 PushOnScopeChains(MoveAssignment, S, false); 8138 ClassDecl->addDecl(MoveAssignment); 8139 8140 AddOverriddenMethods(ClassDecl, MoveAssignment); 8141 return MoveAssignment; 8142} 8143 8144void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8145 CXXMethodDecl *MoveAssignOperator) { 8146 assert((MoveAssignOperator->isDefaulted() && 8147 MoveAssignOperator->isOverloadedOperator() && 8148 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8149 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8150 "DefineImplicitMoveAssignment called for wrong function"); 8151 8152 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8153 8154 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8155 MoveAssignOperator->setInvalidDecl(); 8156 return; 8157 } 8158 8159 MoveAssignOperator->setUsed(); 8160 8161 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8162 DiagnosticErrorTrap Trap(Diags); 8163 8164 // C++0x [class.copy]p28: 8165 // The implicitly-defined or move assignment operator for a non-union class 8166 // X performs memberwise move assignment of its subobjects. The direct base 8167 // classes of X are assigned first, in the order of their declaration in the 8168 // base-specifier-list, and then the immediate non-static data members of X 8169 // are assigned, in the order in which they were declared in the class 8170 // definition. 8171 8172 // The statements that form the synthesized function body. 8173 ASTOwningVector<Stmt*> Statements(*this); 8174 8175 // The parameter for the "other" object, which we are move from. 8176 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8177 QualType OtherRefType = Other->getType()-> 8178 getAs<RValueReferenceType>()->getPointeeType(); 8179 assert(OtherRefType.getQualifiers() == 0 && 8180 "Bad argument type of defaulted move assignment"); 8181 8182 // Our location for everything implicitly-generated. 8183 SourceLocation Loc = MoveAssignOperator->getLocation(); 8184 8185 // Construct a reference to the "other" object. We'll be using this 8186 // throughout the generated ASTs. 8187 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8188 assert(OtherRef && "Reference to parameter cannot fail!"); 8189 // Cast to rvalue. 8190 OtherRef = CastForMoving(*this, OtherRef); 8191 8192 // Construct the "this" pointer. We'll be using this throughout the generated 8193 // ASTs. 8194 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8195 assert(This && "Reference to this cannot fail!"); 8196 8197 // Assign base classes. 8198 bool Invalid = false; 8199 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8200 E = ClassDecl->bases_end(); Base != E; ++Base) { 8201 // Form the assignment: 8202 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8203 QualType BaseType = Base->getType().getUnqualifiedType(); 8204 if (!BaseType->isRecordType()) { 8205 Invalid = true; 8206 continue; 8207 } 8208 8209 CXXCastPath BasePath; 8210 BasePath.push_back(Base); 8211 8212 // Construct the "from" expression, which is an implicit cast to the 8213 // appropriately-qualified base type. 8214 Expr *From = OtherRef; 8215 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8216 VK_XValue, &BasePath).take(); 8217 8218 // Dereference "this". 8219 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8220 8221 // Implicitly cast "this" to the appropriately-qualified base type. 8222 To = ImpCastExprToType(To.take(), 8223 Context.getCVRQualifiedType(BaseType, 8224 MoveAssignOperator->getTypeQualifiers()), 8225 CK_UncheckedDerivedToBase, 8226 VK_LValue, &BasePath); 8227 8228 // Build the move. 8229 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8230 To.get(), From, 8231 /*CopyingBaseSubobject=*/true, 8232 /*Copying=*/false); 8233 if (Move.isInvalid()) { 8234 Diag(CurrentLocation, diag::note_member_synthesized_at) 8235 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8236 MoveAssignOperator->setInvalidDecl(); 8237 return; 8238 } 8239 8240 // Success! Record the move. 8241 Statements.push_back(Move.takeAs<Expr>()); 8242 } 8243 8244 // \brief Reference to the __builtin_memcpy function. 8245 Expr *BuiltinMemCpyRef = 0; 8246 // \brief Reference to the __builtin_objc_memmove_collectable function. 8247 Expr *CollectableMemCpyRef = 0; 8248 8249 // Assign non-static members. 8250 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8251 FieldEnd = ClassDecl->field_end(); 8252 Field != FieldEnd; ++Field) { 8253 if (Field->isUnnamedBitfield()) 8254 continue; 8255 8256 // Check for members of reference type; we can't move those. 8257 if (Field->getType()->isReferenceType()) { 8258 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8259 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8260 Diag(Field->getLocation(), diag::note_declared_at); 8261 Diag(CurrentLocation, diag::note_member_synthesized_at) 8262 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8263 Invalid = true; 8264 continue; 8265 } 8266 8267 // Check for members of const-qualified, non-class type. 8268 QualType BaseType = Context.getBaseElementType(Field->getType()); 8269 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8270 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8271 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8272 Diag(Field->getLocation(), diag::note_declared_at); 8273 Diag(CurrentLocation, diag::note_member_synthesized_at) 8274 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8275 Invalid = true; 8276 continue; 8277 } 8278 8279 // Suppress assigning zero-width bitfields. 8280 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8281 continue; 8282 8283 QualType FieldType = Field->getType().getNonReferenceType(); 8284 if (FieldType->isIncompleteArrayType()) { 8285 assert(ClassDecl->hasFlexibleArrayMember() && 8286 "Incomplete array type is not valid"); 8287 continue; 8288 } 8289 8290 // Build references to the field in the object we're copying from and to. 8291 CXXScopeSpec SS; // Intentionally empty 8292 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8293 LookupMemberName); 8294 MemberLookup.addDecl(*Field); 8295 MemberLookup.resolveKind(); 8296 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8297 Loc, /*IsArrow=*/false, 8298 SS, 0, MemberLookup, 0); 8299 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8300 Loc, /*IsArrow=*/true, 8301 SS, 0, MemberLookup, 0); 8302 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8303 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8304 8305 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8306 "Member reference with rvalue base must be rvalue except for reference " 8307 "members, which aren't allowed for move assignment."); 8308 8309 // If the field should be copied with __builtin_memcpy rather than via 8310 // explicit assignments, do so. This optimization only applies for arrays 8311 // of scalars and arrays of class type with trivial move-assignment 8312 // operators. 8313 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8314 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8315 // Compute the size of the memory buffer to be copied. 8316 QualType SizeType = Context.getSizeType(); 8317 llvm::APInt Size(Context.getTypeSize(SizeType), 8318 Context.getTypeSizeInChars(BaseType).getQuantity()); 8319 for (const ConstantArrayType *Array 8320 = Context.getAsConstantArrayType(FieldType); 8321 Array; 8322 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8323 llvm::APInt ArraySize 8324 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8325 Size *= ArraySize; 8326 } 8327 8328 // Take the address of the field references for "from" and "to". We 8329 // directly construct UnaryOperators here because semantic analysis 8330 // does not permit us to take the address of an xvalue. 8331 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8332 Context.getPointerType(From.get()->getType()), 8333 VK_RValue, OK_Ordinary, Loc); 8334 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8335 Context.getPointerType(To.get()->getType()), 8336 VK_RValue, OK_Ordinary, Loc); 8337 8338 bool NeedsCollectableMemCpy = 8339 (BaseType->isRecordType() && 8340 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8341 8342 if (NeedsCollectableMemCpy) { 8343 if (!CollectableMemCpyRef) { 8344 // Create a reference to the __builtin_objc_memmove_collectable function. 8345 LookupResult R(*this, 8346 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8347 Loc, LookupOrdinaryName); 8348 LookupName(R, TUScope, true); 8349 8350 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8351 if (!CollectableMemCpy) { 8352 // Something went horribly wrong earlier, and we will have 8353 // complained about it. 8354 Invalid = true; 8355 continue; 8356 } 8357 8358 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8359 CollectableMemCpy->getType(), 8360 VK_LValue, Loc, 0).take(); 8361 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8362 } 8363 } 8364 // Create a reference to the __builtin_memcpy builtin function. 8365 else if (!BuiltinMemCpyRef) { 8366 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8367 LookupOrdinaryName); 8368 LookupName(R, TUScope, true); 8369 8370 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8371 if (!BuiltinMemCpy) { 8372 // Something went horribly wrong earlier, and we will have complained 8373 // about it. 8374 Invalid = true; 8375 continue; 8376 } 8377 8378 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8379 BuiltinMemCpy->getType(), 8380 VK_LValue, Loc, 0).take(); 8381 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8382 } 8383 8384 ASTOwningVector<Expr*> CallArgs(*this); 8385 CallArgs.push_back(To.takeAs<Expr>()); 8386 CallArgs.push_back(From.takeAs<Expr>()); 8387 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8388 ExprResult Call = ExprError(); 8389 if (NeedsCollectableMemCpy) 8390 Call = ActOnCallExpr(/*Scope=*/0, 8391 CollectableMemCpyRef, 8392 Loc, move_arg(CallArgs), 8393 Loc); 8394 else 8395 Call = ActOnCallExpr(/*Scope=*/0, 8396 BuiltinMemCpyRef, 8397 Loc, move_arg(CallArgs), 8398 Loc); 8399 8400 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8401 Statements.push_back(Call.takeAs<Expr>()); 8402 continue; 8403 } 8404 8405 // Build the move of this field. 8406 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8407 To.get(), From.get(), 8408 /*CopyingBaseSubobject=*/false, 8409 /*Copying=*/false); 8410 if (Move.isInvalid()) { 8411 Diag(CurrentLocation, diag::note_member_synthesized_at) 8412 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8413 MoveAssignOperator->setInvalidDecl(); 8414 return; 8415 } 8416 8417 // Success! Record the copy. 8418 Statements.push_back(Move.takeAs<Stmt>()); 8419 } 8420 8421 if (!Invalid) { 8422 // Add a "return *this;" 8423 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8424 8425 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8426 if (Return.isInvalid()) 8427 Invalid = true; 8428 else { 8429 Statements.push_back(Return.takeAs<Stmt>()); 8430 8431 if (Trap.hasErrorOccurred()) { 8432 Diag(CurrentLocation, diag::note_member_synthesized_at) 8433 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8434 Invalid = true; 8435 } 8436 } 8437 } 8438 8439 if (Invalid) { 8440 MoveAssignOperator->setInvalidDecl(); 8441 return; 8442 } 8443 8444 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8445 /*isStmtExpr=*/false); 8446 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8447 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8448 8449 if (ASTMutationListener *L = getASTMutationListener()) { 8450 L->CompletedImplicitDefinition(MoveAssignOperator); 8451 } 8452} 8453 8454std::pair<Sema::ImplicitExceptionSpecification, bool> 8455Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8456 if (ClassDecl->isInvalidDecl()) 8457 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8458 8459 // C++ [class.copy]p5: 8460 // The implicitly-declared copy constructor for a class X will 8461 // have the form 8462 // 8463 // X::X(const X&) 8464 // 8465 // if 8466 // FIXME: It ought to be possible to store this on the record. 8467 bool HasConstCopyConstructor = true; 8468 8469 // -- each direct or virtual base class B of X has a copy 8470 // constructor whose first parameter is of type const B& or 8471 // const volatile B&, and 8472 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8473 BaseEnd = ClassDecl->bases_end(); 8474 HasConstCopyConstructor && Base != BaseEnd; 8475 ++Base) { 8476 // Virtual bases are handled below. 8477 if (Base->isVirtual()) 8478 continue; 8479 8480 CXXRecordDecl *BaseClassDecl 8481 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8482 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8483 &HasConstCopyConstructor); 8484 } 8485 8486 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8487 BaseEnd = ClassDecl->vbases_end(); 8488 HasConstCopyConstructor && Base != BaseEnd; 8489 ++Base) { 8490 CXXRecordDecl *BaseClassDecl 8491 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8492 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8493 &HasConstCopyConstructor); 8494 } 8495 8496 // -- for all the nonstatic data members of X that are of a 8497 // class type M (or array thereof), each such class type 8498 // has a copy constructor whose first parameter is of type 8499 // const M& or const volatile M&. 8500 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8501 FieldEnd = ClassDecl->field_end(); 8502 HasConstCopyConstructor && Field != FieldEnd; 8503 ++Field) { 8504 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8505 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8506 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8507 &HasConstCopyConstructor); 8508 } 8509 } 8510 // Otherwise, the implicitly declared copy constructor will have 8511 // the form 8512 // 8513 // X::X(X&) 8514 8515 // C++ [except.spec]p14: 8516 // An implicitly declared special member function (Clause 12) shall have an 8517 // exception-specification. [...] 8518 ImplicitExceptionSpecification ExceptSpec(Context); 8519 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8520 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8521 BaseEnd = ClassDecl->bases_end(); 8522 Base != BaseEnd; 8523 ++Base) { 8524 // Virtual bases are handled below. 8525 if (Base->isVirtual()) 8526 continue; 8527 8528 CXXRecordDecl *BaseClassDecl 8529 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8530 if (CXXConstructorDecl *CopyConstructor = 8531 LookupCopyingConstructor(BaseClassDecl, Quals)) 8532 ExceptSpec.CalledDecl(CopyConstructor); 8533 } 8534 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8535 BaseEnd = ClassDecl->vbases_end(); 8536 Base != BaseEnd; 8537 ++Base) { 8538 CXXRecordDecl *BaseClassDecl 8539 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8540 if (CXXConstructorDecl *CopyConstructor = 8541 LookupCopyingConstructor(BaseClassDecl, Quals)) 8542 ExceptSpec.CalledDecl(CopyConstructor); 8543 } 8544 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8545 FieldEnd = ClassDecl->field_end(); 8546 Field != FieldEnd; 8547 ++Field) { 8548 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8549 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8550 if (CXXConstructorDecl *CopyConstructor = 8551 LookupCopyingConstructor(FieldClassDecl, Quals)) 8552 ExceptSpec.CalledDecl(CopyConstructor); 8553 } 8554 } 8555 8556 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8557} 8558 8559CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8560 CXXRecordDecl *ClassDecl) { 8561 // C++ [class.copy]p4: 8562 // If the class definition does not explicitly declare a copy 8563 // constructor, one is declared implicitly. 8564 8565 ImplicitExceptionSpecification Spec(Context); 8566 bool Const; 8567 llvm::tie(Spec, Const) = 8568 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8569 8570 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8571 QualType ArgType = ClassType; 8572 if (Const) 8573 ArgType = ArgType.withConst(); 8574 ArgType = Context.getLValueReferenceType(ArgType); 8575 8576 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8577 8578 DeclarationName Name 8579 = Context.DeclarationNames.getCXXConstructorName( 8580 Context.getCanonicalType(ClassType)); 8581 SourceLocation ClassLoc = ClassDecl->getLocation(); 8582 DeclarationNameInfo NameInfo(Name, ClassLoc); 8583 8584 // An implicitly-declared copy constructor is an inline public 8585 // member of its class. 8586 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8587 Context, ClassDecl, ClassLoc, NameInfo, 8588 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8589 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8590 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8591 getLangOptions().CPlusPlus0x); 8592 CopyConstructor->setAccess(AS_public); 8593 CopyConstructor->setDefaulted(); 8594 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8595 8596 // Note that we have declared this constructor. 8597 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8598 8599 // Add the parameter to the constructor. 8600 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8601 ClassLoc, ClassLoc, 8602 /*IdentifierInfo=*/0, 8603 ArgType, /*TInfo=*/0, 8604 SC_None, 8605 SC_None, 0); 8606 CopyConstructor->setParams(FromParam); 8607 8608 if (Scope *S = getScopeForContext(ClassDecl)) 8609 PushOnScopeChains(CopyConstructor, S, false); 8610 ClassDecl->addDecl(CopyConstructor); 8611 8612 // C++0x [class.copy]p7: 8613 // ... If the class definition declares a move constructor or move 8614 // assignment operator, the implicitly declared constructor is defined as 8615 // deleted; ... 8616 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8617 ClassDecl->hasUserDeclaredMoveAssignment() || 8618 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8619 CopyConstructor->setDeletedAsWritten(); 8620 8621 return CopyConstructor; 8622} 8623 8624void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8625 CXXConstructorDecl *CopyConstructor) { 8626 assert((CopyConstructor->isDefaulted() && 8627 CopyConstructor->isCopyConstructor() && 8628 !CopyConstructor->doesThisDeclarationHaveABody()) && 8629 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8630 8631 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8632 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8633 8634 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8635 DiagnosticErrorTrap Trap(Diags); 8636 8637 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8638 Trap.hasErrorOccurred()) { 8639 Diag(CurrentLocation, diag::note_member_synthesized_at) 8640 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8641 CopyConstructor->setInvalidDecl(); 8642 } else { 8643 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8644 CopyConstructor->getLocation(), 8645 MultiStmtArg(*this, 0, 0), 8646 /*isStmtExpr=*/false) 8647 .takeAs<Stmt>()); 8648 CopyConstructor->setImplicitlyDefined(true); 8649 } 8650 8651 CopyConstructor->setUsed(); 8652 if (ASTMutationListener *L = getASTMutationListener()) { 8653 L->CompletedImplicitDefinition(CopyConstructor); 8654 } 8655} 8656 8657Sema::ImplicitExceptionSpecification 8658Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8659 // C++ [except.spec]p14: 8660 // An implicitly declared special member function (Clause 12) shall have an 8661 // exception-specification. [...] 8662 ImplicitExceptionSpecification ExceptSpec(Context); 8663 if (ClassDecl->isInvalidDecl()) 8664 return ExceptSpec; 8665 8666 // Direct base-class constructors. 8667 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8668 BEnd = ClassDecl->bases_end(); 8669 B != BEnd; ++B) { 8670 if (B->isVirtual()) // Handled below. 8671 continue; 8672 8673 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8674 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8675 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8676 // If this is a deleted function, add it anyway. This might be conformant 8677 // with the standard. This might not. I'm not sure. It might not matter. 8678 if (Constructor) 8679 ExceptSpec.CalledDecl(Constructor); 8680 } 8681 } 8682 8683 // Virtual base-class constructors. 8684 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8685 BEnd = ClassDecl->vbases_end(); 8686 B != BEnd; ++B) { 8687 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8688 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8689 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8690 // If this is a deleted function, add it anyway. This might be conformant 8691 // with the standard. This might not. I'm not sure. It might not matter. 8692 if (Constructor) 8693 ExceptSpec.CalledDecl(Constructor); 8694 } 8695 } 8696 8697 // Field constructors. 8698 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8699 FEnd = ClassDecl->field_end(); 8700 F != FEnd; ++F) { 8701 if (const RecordType *RecordTy 8702 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8703 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8704 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8705 // If this is a deleted function, add it anyway. This might be conformant 8706 // with the standard. This might not. I'm not sure. It might not matter. 8707 // In particular, the problem is that this function never gets called. It 8708 // might just be ill-formed because this function attempts to refer to 8709 // a deleted function here. 8710 if (Constructor) 8711 ExceptSpec.CalledDecl(Constructor); 8712 } 8713 } 8714 8715 return ExceptSpec; 8716} 8717 8718CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8719 CXXRecordDecl *ClassDecl) { 8720 ImplicitExceptionSpecification Spec( 8721 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8722 8723 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8724 QualType ArgType = Context.getRValueReferenceType(ClassType); 8725 8726 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8727 8728 DeclarationName Name 8729 = Context.DeclarationNames.getCXXConstructorName( 8730 Context.getCanonicalType(ClassType)); 8731 SourceLocation ClassLoc = ClassDecl->getLocation(); 8732 DeclarationNameInfo NameInfo(Name, ClassLoc); 8733 8734 // C++0x [class.copy]p11: 8735 // An implicitly-declared copy/move constructor is an inline public 8736 // member of its class. 8737 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8738 Context, ClassDecl, ClassLoc, NameInfo, 8739 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8740 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8741 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8742 getLangOptions().CPlusPlus0x); 8743 MoveConstructor->setAccess(AS_public); 8744 MoveConstructor->setDefaulted(); 8745 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8746 8747 // Add the parameter to the constructor. 8748 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8749 ClassLoc, ClassLoc, 8750 /*IdentifierInfo=*/0, 8751 ArgType, /*TInfo=*/0, 8752 SC_None, 8753 SC_None, 0); 8754 MoveConstructor->setParams(FromParam); 8755 8756 // C++0x [class.copy]p9: 8757 // If the definition of a class X does not explicitly declare a move 8758 // constructor, one will be implicitly declared as defaulted if and only if: 8759 // [...] 8760 // - the move constructor would not be implicitly defined as deleted. 8761 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8762 // Cache this result so that we don't try to generate this over and over 8763 // on every lookup, leaking memory and wasting time. 8764 ClassDecl->setFailedImplicitMoveConstructor(); 8765 return 0; 8766 } 8767 8768 // Note that we have declared this constructor. 8769 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8770 8771 if (Scope *S = getScopeForContext(ClassDecl)) 8772 PushOnScopeChains(MoveConstructor, S, false); 8773 ClassDecl->addDecl(MoveConstructor); 8774 8775 return MoveConstructor; 8776} 8777 8778void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8779 CXXConstructorDecl *MoveConstructor) { 8780 assert((MoveConstructor->isDefaulted() && 8781 MoveConstructor->isMoveConstructor() && 8782 !MoveConstructor->doesThisDeclarationHaveABody()) && 8783 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8784 8785 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8786 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8787 8788 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8789 DiagnosticErrorTrap Trap(Diags); 8790 8791 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8792 Trap.hasErrorOccurred()) { 8793 Diag(CurrentLocation, diag::note_member_synthesized_at) 8794 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8795 MoveConstructor->setInvalidDecl(); 8796 } else { 8797 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8798 MoveConstructor->getLocation(), 8799 MultiStmtArg(*this, 0, 0), 8800 /*isStmtExpr=*/false) 8801 .takeAs<Stmt>()); 8802 MoveConstructor->setImplicitlyDefined(true); 8803 } 8804 8805 MoveConstructor->setUsed(); 8806 8807 if (ASTMutationListener *L = getASTMutationListener()) { 8808 L->CompletedImplicitDefinition(MoveConstructor); 8809 } 8810} 8811 8812ExprResult 8813Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8814 CXXConstructorDecl *Constructor, 8815 MultiExprArg ExprArgs, 8816 bool HadMultipleCandidates, 8817 bool RequiresZeroInit, 8818 unsigned ConstructKind, 8819 SourceRange ParenRange) { 8820 bool Elidable = false; 8821 8822 // C++0x [class.copy]p34: 8823 // When certain criteria are met, an implementation is allowed to 8824 // omit the copy/move construction of a class object, even if the 8825 // copy/move constructor and/or destructor for the object have 8826 // side effects. [...] 8827 // - when a temporary class object that has not been bound to a 8828 // reference (12.2) would be copied/moved to a class object 8829 // with the same cv-unqualified type, the copy/move operation 8830 // can be omitted by constructing the temporary object 8831 // directly into the target of the omitted copy/move 8832 if (ConstructKind == CXXConstructExpr::CK_Complete && 8833 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8834 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8835 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8836 } 8837 8838 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8839 Elidable, move(ExprArgs), HadMultipleCandidates, 8840 RequiresZeroInit, ConstructKind, ParenRange); 8841} 8842 8843/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8844/// including handling of its default argument expressions. 8845ExprResult 8846Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8847 CXXConstructorDecl *Constructor, bool Elidable, 8848 MultiExprArg ExprArgs, 8849 bool HadMultipleCandidates, 8850 bool RequiresZeroInit, 8851 unsigned ConstructKind, 8852 SourceRange ParenRange) { 8853 unsigned NumExprs = ExprArgs.size(); 8854 Expr **Exprs = (Expr **)ExprArgs.release(); 8855 8856 for (specific_attr_iterator<NonNullAttr> 8857 i = Constructor->specific_attr_begin<NonNullAttr>(), 8858 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8859 const NonNullAttr *NonNull = *i; 8860 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8861 } 8862 8863 MarkDeclarationReferenced(ConstructLoc, Constructor); 8864 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8865 Constructor, Elidable, Exprs, NumExprs, 8866 HadMultipleCandidates, RequiresZeroInit, 8867 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8868 ParenRange)); 8869} 8870 8871bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8872 CXXConstructorDecl *Constructor, 8873 MultiExprArg Exprs, 8874 bool HadMultipleCandidates) { 8875 // FIXME: Provide the correct paren SourceRange when available. 8876 ExprResult TempResult = 8877 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8878 move(Exprs), HadMultipleCandidates, false, 8879 CXXConstructExpr::CK_Complete, SourceRange()); 8880 if (TempResult.isInvalid()) 8881 return true; 8882 8883 Expr *Temp = TempResult.takeAs<Expr>(); 8884 CheckImplicitConversions(Temp, VD->getLocation()); 8885 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8886 Temp = MaybeCreateExprWithCleanups(Temp); 8887 VD->setInit(Temp); 8888 8889 return false; 8890} 8891 8892void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8893 if (VD->isInvalidDecl()) return; 8894 8895 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8896 if (ClassDecl->isInvalidDecl()) return; 8897 if (ClassDecl->hasTrivialDestructor()) return; 8898 if (ClassDecl->isDependentContext()) return; 8899 8900 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8901 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8902 CheckDestructorAccess(VD->getLocation(), Destructor, 8903 PDiag(diag::err_access_dtor_var) 8904 << VD->getDeclName() 8905 << VD->getType()); 8906 8907 if (!VD->hasGlobalStorage()) return; 8908 8909 // Emit warning for non-trivial dtor in global scope (a real global, 8910 // class-static, function-static). 8911 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8912 8913 // TODO: this should be re-enabled for static locals by !CXAAtExit 8914 if (!VD->isStaticLocal()) 8915 Diag(VD->getLocation(), diag::warn_global_destructor); 8916} 8917 8918/// AddCXXDirectInitializerToDecl - This action is called immediately after 8919/// ActOnDeclarator, when a C++ direct initializer is present. 8920/// e.g: "int x(1);" 8921void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8922 SourceLocation LParenLoc, 8923 MultiExprArg Exprs, 8924 SourceLocation RParenLoc, 8925 bool TypeMayContainAuto) { 8926 // If there is no declaration, there was an error parsing it. Just ignore 8927 // the initializer. 8928 if (RealDecl == 0) 8929 return; 8930 8931 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8932 if (!VDecl) { 8933 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8934 RealDecl->setInvalidDecl(); 8935 return; 8936 } 8937 8938 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8939 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8940 if (Exprs.size() == 0) { 8941 // It isn't possible to write this directly, but it is possible to 8942 // end up in this situation with "auto x(some_pack...);" 8943 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 8944 << VDecl->getDeclName() << VDecl->getType() 8945 << VDecl->getSourceRange(); 8946 RealDecl->setInvalidDecl(); 8947 return; 8948 } 8949 8950 if (Exprs.size() > 1) { 8951 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8952 diag::err_auto_var_init_multiple_expressions) 8953 << VDecl->getDeclName() << VDecl->getType() 8954 << VDecl->getSourceRange(); 8955 RealDecl->setInvalidDecl(); 8956 return; 8957 } 8958 8959 Expr *Init = Exprs.get()[0]; 8960 TypeSourceInfo *DeducedType = 0; 8961 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8962 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8963 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8964 << Init->getSourceRange(); 8965 if (!DeducedType) { 8966 RealDecl->setInvalidDecl(); 8967 return; 8968 } 8969 VDecl->setTypeSourceInfo(DeducedType); 8970 VDecl->setType(DeducedType->getType()); 8971 8972 // In ARC, infer lifetime. 8973 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8974 VDecl->setInvalidDecl(); 8975 8976 // If this is a redeclaration, check that the type we just deduced matches 8977 // the previously declared type. 8978 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8979 MergeVarDeclTypes(VDecl, Old); 8980 } 8981 8982 // We will represent direct-initialization similarly to copy-initialization: 8983 // int x(1); -as-> int x = 1; 8984 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8985 // 8986 // Clients that want to distinguish between the two forms, can check for 8987 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8988 // A major benefit is that clients that don't particularly care about which 8989 // exactly form was it (like the CodeGen) can handle both cases without 8990 // special case code. 8991 8992 // C++ 8.5p11: 8993 // The form of initialization (using parentheses or '=') is generally 8994 // insignificant, but does matter when the entity being initialized has a 8995 // class type. 8996 8997 if (!VDecl->getType()->isDependentType() && 8998 !VDecl->getType()->isIncompleteArrayType() && 8999 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9000 diag::err_typecheck_decl_incomplete_type)) { 9001 VDecl->setInvalidDecl(); 9002 return; 9003 } 9004 9005 // The variable can not have an abstract class type. 9006 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9007 diag::err_abstract_type_in_decl, 9008 AbstractVariableType)) 9009 VDecl->setInvalidDecl(); 9010 9011 const VarDecl *Def; 9012 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9013 Diag(VDecl->getLocation(), diag::err_redefinition) 9014 << VDecl->getDeclName(); 9015 Diag(Def->getLocation(), diag::note_previous_definition); 9016 VDecl->setInvalidDecl(); 9017 return; 9018 } 9019 9020 // C++ [class.static.data]p4 9021 // If a static data member is of const integral or const 9022 // enumeration type, its declaration in the class definition can 9023 // specify a constant-initializer which shall be an integral 9024 // constant expression (5.19). In that case, the member can appear 9025 // in integral constant expressions. The member shall still be 9026 // defined in a namespace scope if it is used in the program and the 9027 // namespace scope definition shall not contain an initializer. 9028 // 9029 // We already performed a redefinition check above, but for static 9030 // data members we also need to check whether there was an in-class 9031 // declaration with an initializer. 9032 const VarDecl* PrevInit = 0; 9033 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9034 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9035 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9036 return; 9037 } 9038 9039 bool IsDependent = false; 9040 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9041 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9042 VDecl->setInvalidDecl(); 9043 return; 9044 } 9045 9046 if (Exprs.get()[I]->isTypeDependent()) 9047 IsDependent = true; 9048 } 9049 9050 // If either the declaration has a dependent type or if any of the 9051 // expressions is type-dependent, we represent the initialization 9052 // via a ParenListExpr for later use during template instantiation. 9053 if (VDecl->getType()->isDependentType() || IsDependent) { 9054 // Let clients know that initialization was done with a direct initializer. 9055 VDecl->setCXXDirectInitializer(true); 9056 9057 // Store the initialization expressions as a ParenListExpr. 9058 unsigned NumExprs = Exprs.size(); 9059 VDecl->setInit(new (Context) ParenListExpr( 9060 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9061 VDecl->getType().getNonReferenceType())); 9062 return; 9063 } 9064 9065 // Capture the variable that is being initialized and the style of 9066 // initialization. 9067 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9068 9069 // FIXME: Poor source location information. 9070 InitializationKind Kind 9071 = InitializationKind::CreateDirect(VDecl->getLocation(), 9072 LParenLoc, RParenLoc); 9073 9074 QualType T = VDecl->getType(); 9075 InitializationSequence InitSeq(*this, Entity, Kind, 9076 Exprs.get(), Exprs.size()); 9077 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9078 if (Result.isInvalid()) { 9079 VDecl->setInvalidDecl(); 9080 return; 9081 } else if (T != VDecl->getType()) { 9082 VDecl->setType(T); 9083 Result.get()->setType(T); 9084 } 9085 9086 9087 Expr *Init = Result.get(); 9088 CheckImplicitConversions(Init, LParenLoc); 9089 9090 Init = MaybeCreateExprWithCleanups(Init); 9091 VDecl->setInit(Init); 9092 VDecl->setCXXDirectInitializer(true); 9093 9094 CheckCompleteVariableDeclaration(VDecl); 9095} 9096 9097/// \brief Given a constructor and the set of arguments provided for the 9098/// constructor, convert the arguments and add any required default arguments 9099/// to form a proper call to this constructor. 9100/// 9101/// \returns true if an error occurred, false otherwise. 9102bool 9103Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9104 MultiExprArg ArgsPtr, 9105 SourceLocation Loc, 9106 ASTOwningVector<Expr*> &ConvertedArgs) { 9107 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9108 unsigned NumArgs = ArgsPtr.size(); 9109 Expr **Args = (Expr **)ArgsPtr.get(); 9110 9111 const FunctionProtoType *Proto 9112 = Constructor->getType()->getAs<FunctionProtoType>(); 9113 assert(Proto && "Constructor without a prototype?"); 9114 unsigned NumArgsInProto = Proto->getNumArgs(); 9115 9116 // If too few arguments are available, we'll fill in the rest with defaults. 9117 if (NumArgs < NumArgsInProto) 9118 ConvertedArgs.reserve(NumArgsInProto); 9119 else 9120 ConvertedArgs.reserve(NumArgs); 9121 9122 VariadicCallType CallType = 9123 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9124 SmallVector<Expr *, 8> AllArgs; 9125 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9126 Proto, 0, Args, NumArgs, AllArgs, 9127 CallType); 9128 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9129 ConvertedArgs.push_back(AllArgs[i]); 9130 return Invalid; 9131} 9132 9133static inline bool 9134CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9135 const FunctionDecl *FnDecl) { 9136 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9137 if (isa<NamespaceDecl>(DC)) { 9138 return SemaRef.Diag(FnDecl->getLocation(), 9139 diag::err_operator_new_delete_declared_in_namespace) 9140 << FnDecl->getDeclName(); 9141 } 9142 9143 if (isa<TranslationUnitDecl>(DC) && 9144 FnDecl->getStorageClass() == SC_Static) { 9145 return SemaRef.Diag(FnDecl->getLocation(), 9146 diag::err_operator_new_delete_declared_static) 9147 << FnDecl->getDeclName(); 9148 } 9149 9150 return false; 9151} 9152 9153static inline bool 9154CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9155 CanQualType ExpectedResultType, 9156 CanQualType ExpectedFirstParamType, 9157 unsigned DependentParamTypeDiag, 9158 unsigned InvalidParamTypeDiag) { 9159 QualType ResultType = 9160 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9161 9162 // Check that the result type is not dependent. 9163 if (ResultType->isDependentType()) 9164 return SemaRef.Diag(FnDecl->getLocation(), 9165 diag::err_operator_new_delete_dependent_result_type) 9166 << FnDecl->getDeclName() << ExpectedResultType; 9167 9168 // Check that the result type is what we expect. 9169 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9170 return SemaRef.Diag(FnDecl->getLocation(), 9171 diag::err_operator_new_delete_invalid_result_type) 9172 << FnDecl->getDeclName() << ExpectedResultType; 9173 9174 // A function template must have at least 2 parameters. 9175 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9176 return SemaRef.Diag(FnDecl->getLocation(), 9177 diag::err_operator_new_delete_template_too_few_parameters) 9178 << FnDecl->getDeclName(); 9179 9180 // The function decl must have at least 1 parameter. 9181 if (FnDecl->getNumParams() == 0) 9182 return SemaRef.Diag(FnDecl->getLocation(), 9183 diag::err_operator_new_delete_too_few_parameters) 9184 << FnDecl->getDeclName(); 9185 9186 // Check the the first parameter type is not dependent. 9187 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9188 if (FirstParamType->isDependentType()) 9189 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9190 << FnDecl->getDeclName() << ExpectedFirstParamType; 9191 9192 // Check that the first parameter type is what we expect. 9193 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9194 ExpectedFirstParamType) 9195 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9196 << FnDecl->getDeclName() << ExpectedFirstParamType; 9197 9198 return false; 9199} 9200 9201static bool 9202CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9203 // C++ [basic.stc.dynamic.allocation]p1: 9204 // A program is ill-formed if an allocation function is declared in a 9205 // namespace scope other than global scope or declared static in global 9206 // scope. 9207 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9208 return true; 9209 9210 CanQualType SizeTy = 9211 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9212 9213 // C++ [basic.stc.dynamic.allocation]p1: 9214 // The return type shall be void*. The first parameter shall have type 9215 // std::size_t. 9216 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9217 SizeTy, 9218 diag::err_operator_new_dependent_param_type, 9219 diag::err_operator_new_param_type)) 9220 return true; 9221 9222 // C++ [basic.stc.dynamic.allocation]p1: 9223 // The first parameter shall not have an associated default argument. 9224 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9225 return SemaRef.Diag(FnDecl->getLocation(), 9226 diag::err_operator_new_default_arg) 9227 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9228 9229 return false; 9230} 9231 9232static bool 9233CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9234 // C++ [basic.stc.dynamic.deallocation]p1: 9235 // A program is ill-formed if deallocation functions are declared in a 9236 // namespace scope other than global scope or declared static in global 9237 // scope. 9238 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9239 return true; 9240 9241 // C++ [basic.stc.dynamic.deallocation]p2: 9242 // Each deallocation function shall return void and its first parameter 9243 // shall be void*. 9244 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9245 SemaRef.Context.VoidPtrTy, 9246 diag::err_operator_delete_dependent_param_type, 9247 diag::err_operator_delete_param_type)) 9248 return true; 9249 9250 return false; 9251} 9252 9253/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9254/// of this overloaded operator is well-formed. If so, returns false; 9255/// otherwise, emits appropriate diagnostics and returns true. 9256bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9257 assert(FnDecl && FnDecl->isOverloadedOperator() && 9258 "Expected an overloaded operator declaration"); 9259 9260 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9261 9262 // C++ [over.oper]p5: 9263 // The allocation and deallocation functions, operator new, 9264 // operator new[], operator delete and operator delete[], are 9265 // described completely in 3.7.3. The attributes and restrictions 9266 // found in the rest of this subclause do not apply to them unless 9267 // explicitly stated in 3.7.3. 9268 if (Op == OO_Delete || Op == OO_Array_Delete) 9269 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9270 9271 if (Op == OO_New || Op == OO_Array_New) 9272 return CheckOperatorNewDeclaration(*this, FnDecl); 9273 9274 // C++ [over.oper]p6: 9275 // An operator function shall either be a non-static member 9276 // function or be a non-member function and have at least one 9277 // parameter whose type is a class, a reference to a class, an 9278 // enumeration, or a reference to an enumeration. 9279 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9280 if (MethodDecl->isStatic()) 9281 return Diag(FnDecl->getLocation(), 9282 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9283 } else { 9284 bool ClassOrEnumParam = false; 9285 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9286 ParamEnd = FnDecl->param_end(); 9287 Param != ParamEnd; ++Param) { 9288 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9289 if (ParamType->isDependentType() || ParamType->isRecordType() || 9290 ParamType->isEnumeralType()) { 9291 ClassOrEnumParam = true; 9292 break; 9293 } 9294 } 9295 9296 if (!ClassOrEnumParam) 9297 return Diag(FnDecl->getLocation(), 9298 diag::err_operator_overload_needs_class_or_enum) 9299 << FnDecl->getDeclName(); 9300 } 9301 9302 // C++ [over.oper]p8: 9303 // An operator function cannot have default arguments (8.3.6), 9304 // except where explicitly stated below. 9305 // 9306 // Only the function-call operator allows default arguments 9307 // (C++ [over.call]p1). 9308 if (Op != OO_Call) { 9309 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9310 Param != FnDecl->param_end(); ++Param) { 9311 if ((*Param)->hasDefaultArg()) 9312 return Diag((*Param)->getLocation(), 9313 diag::err_operator_overload_default_arg) 9314 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9315 } 9316 } 9317 9318 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9319 { false, false, false } 9320#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9321 , { Unary, Binary, MemberOnly } 9322#include "clang/Basic/OperatorKinds.def" 9323 }; 9324 9325 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9326 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9327 bool MustBeMemberOperator = OperatorUses[Op][2]; 9328 9329 // C++ [over.oper]p8: 9330 // [...] Operator functions cannot have more or fewer parameters 9331 // than the number required for the corresponding operator, as 9332 // described in the rest of this subclause. 9333 unsigned NumParams = FnDecl->getNumParams() 9334 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9335 if (Op != OO_Call && 9336 ((NumParams == 1 && !CanBeUnaryOperator) || 9337 (NumParams == 2 && !CanBeBinaryOperator) || 9338 (NumParams < 1) || (NumParams > 2))) { 9339 // We have the wrong number of parameters. 9340 unsigned ErrorKind; 9341 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9342 ErrorKind = 2; // 2 -> unary or binary. 9343 } else if (CanBeUnaryOperator) { 9344 ErrorKind = 0; // 0 -> unary 9345 } else { 9346 assert(CanBeBinaryOperator && 9347 "All non-call overloaded operators are unary or binary!"); 9348 ErrorKind = 1; // 1 -> binary 9349 } 9350 9351 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9352 << FnDecl->getDeclName() << NumParams << ErrorKind; 9353 } 9354 9355 // Overloaded operators other than operator() cannot be variadic. 9356 if (Op != OO_Call && 9357 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9358 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9359 << FnDecl->getDeclName(); 9360 } 9361 9362 // Some operators must be non-static member functions. 9363 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9364 return Diag(FnDecl->getLocation(), 9365 diag::err_operator_overload_must_be_member) 9366 << FnDecl->getDeclName(); 9367 } 9368 9369 // C++ [over.inc]p1: 9370 // The user-defined function called operator++ implements the 9371 // prefix and postfix ++ operator. If this function is a member 9372 // function with no parameters, or a non-member function with one 9373 // parameter of class or enumeration type, it defines the prefix 9374 // increment operator ++ for objects of that type. If the function 9375 // is a member function with one parameter (which shall be of type 9376 // int) or a non-member function with two parameters (the second 9377 // of which shall be of type int), it defines the postfix 9378 // increment operator ++ for objects of that type. 9379 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9380 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9381 bool ParamIsInt = false; 9382 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9383 ParamIsInt = BT->getKind() == BuiltinType::Int; 9384 9385 if (!ParamIsInt) 9386 return Diag(LastParam->getLocation(), 9387 diag::err_operator_overload_post_incdec_must_be_int) 9388 << LastParam->getType() << (Op == OO_MinusMinus); 9389 } 9390 9391 return false; 9392} 9393 9394/// CheckLiteralOperatorDeclaration - Check whether the declaration 9395/// of this literal operator function is well-formed. If so, returns 9396/// false; otherwise, emits appropriate diagnostics and returns true. 9397bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9398 DeclContext *DC = FnDecl->getDeclContext(); 9399 Decl::Kind Kind = DC->getDeclKind(); 9400 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9401 Kind != Decl::LinkageSpec) { 9402 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9403 << FnDecl->getDeclName(); 9404 return true; 9405 } 9406 9407 bool Valid = false; 9408 9409 // template <char...> type operator "" name() is the only valid template 9410 // signature, and the only valid signature with no parameters. 9411 if (FnDecl->param_size() == 0) { 9412 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9413 // Must have only one template parameter 9414 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9415 if (Params->size() == 1) { 9416 NonTypeTemplateParmDecl *PmDecl = 9417 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9418 9419 // The template parameter must be a char parameter pack. 9420 if (PmDecl && PmDecl->isTemplateParameterPack() && 9421 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9422 Valid = true; 9423 } 9424 } 9425 } else { 9426 // Check the first parameter 9427 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9428 9429 QualType T = (*Param)->getType(); 9430 9431 // unsigned long long int, long double, and any character type are allowed 9432 // as the only parameters. 9433 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9434 Context.hasSameType(T, Context.LongDoubleTy) || 9435 Context.hasSameType(T, Context.CharTy) || 9436 Context.hasSameType(T, Context.WCharTy) || 9437 Context.hasSameType(T, Context.Char16Ty) || 9438 Context.hasSameType(T, Context.Char32Ty)) { 9439 if (++Param == FnDecl->param_end()) 9440 Valid = true; 9441 goto FinishedParams; 9442 } 9443 9444 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9445 const PointerType *PT = T->getAs<PointerType>(); 9446 if (!PT) 9447 goto FinishedParams; 9448 T = PT->getPointeeType(); 9449 if (!T.isConstQualified()) 9450 goto FinishedParams; 9451 T = T.getUnqualifiedType(); 9452 9453 // Move on to the second parameter; 9454 ++Param; 9455 9456 // If there is no second parameter, the first must be a const char * 9457 if (Param == FnDecl->param_end()) { 9458 if (Context.hasSameType(T, Context.CharTy)) 9459 Valid = true; 9460 goto FinishedParams; 9461 } 9462 9463 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9464 // are allowed as the first parameter to a two-parameter function 9465 if (!(Context.hasSameType(T, Context.CharTy) || 9466 Context.hasSameType(T, Context.WCharTy) || 9467 Context.hasSameType(T, Context.Char16Ty) || 9468 Context.hasSameType(T, Context.Char32Ty))) 9469 goto FinishedParams; 9470 9471 // The second and final parameter must be an std::size_t 9472 T = (*Param)->getType().getUnqualifiedType(); 9473 if (Context.hasSameType(T, Context.getSizeType()) && 9474 ++Param == FnDecl->param_end()) 9475 Valid = true; 9476 } 9477 9478 // FIXME: This diagnostic is absolutely terrible. 9479FinishedParams: 9480 if (!Valid) { 9481 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9482 << FnDecl->getDeclName(); 9483 return true; 9484 } 9485 9486 StringRef LiteralName 9487 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9488 if (LiteralName[0] != '_') { 9489 // C++0x [usrlit.suffix]p1: 9490 // Literal suffix identifiers that do not start with an underscore are 9491 // reserved for future standardization. 9492 bool IsHexFloat = true; 9493 if (LiteralName.size() > 1 && 9494 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9495 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9496 if (!isdigit(LiteralName[I])) { 9497 IsHexFloat = false; 9498 break; 9499 } 9500 } 9501 } 9502 9503 if (IsHexFloat) 9504 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9505 << LiteralName; 9506 else 9507 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9508 } 9509 9510 return false; 9511} 9512 9513/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9514/// linkage specification, including the language and (if present) 9515/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9516/// the location of the language string literal, which is provided 9517/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9518/// the '{' brace. Otherwise, this linkage specification does not 9519/// have any braces. 9520Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9521 SourceLocation LangLoc, 9522 StringRef Lang, 9523 SourceLocation LBraceLoc) { 9524 LinkageSpecDecl::LanguageIDs Language; 9525 if (Lang == "\"C\"") 9526 Language = LinkageSpecDecl::lang_c; 9527 else if (Lang == "\"C++\"") 9528 Language = LinkageSpecDecl::lang_cxx; 9529 else { 9530 Diag(LangLoc, diag::err_bad_language); 9531 return 0; 9532 } 9533 9534 // FIXME: Add all the various semantics of linkage specifications 9535 9536 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9537 ExternLoc, LangLoc, Language); 9538 CurContext->addDecl(D); 9539 PushDeclContext(S, D); 9540 return D; 9541} 9542 9543/// ActOnFinishLinkageSpecification - Complete the definition of 9544/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9545/// valid, it's the position of the closing '}' brace in a linkage 9546/// specification that uses braces. 9547Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9548 Decl *LinkageSpec, 9549 SourceLocation RBraceLoc) { 9550 if (LinkageSpec) { 9551 if (RBraceLoc.isValid()) { 9552 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9553 LSDecl->setRBraceLoc(RBraceLoc); 9554 } 9555 PopDeclContext(); 9556 } 9557 return LinkageSpec; 9558} 9559 9560/// \brief Perform semantic analysis for the variable declaration that 9561/// occurs within a C++ catch clause, returning the newly-created 9562/// variable. 9563VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9564 TypeSourceInfo *TInfo, 9565 SourceLocation StartLoc, 9566 SourceLocation Loc, 9567 IdentifierInfo *Name) { 9568 bool Invalid = false; 9569 QualType ExDeclType = TInfo->getType(); 9570 9571 // Arrays and functions decay. 9572 if (ExDeclType->isArrayType()) 9573 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9574 else if (ExDeclType->isFunctionType()) 9575 ExDeclType = Context.getPointerType(ExDeclType); 9576 9577 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9578 // The exception-declaration shall not denote a pointer or reference to an 9579 // incomplete type, other than [cv] void*. 9580 // N2844 forbids rvalue references. 9581 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9582 Diag(Loc, diag::err_catch_rvalue_ref); 9583 Invalid = true; 9584 } 9585 9586 // GCC allows catching pointers and references to incomplete types 9587 // as an extension; so do we, but we warn by default. 9588 9589 QualType BaseType = ExDeclType; 9590 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9591 unsigned DK = diag::err_catch_incomplete; 9592 bool IncompleteCatchIsInvalid = true; 9593 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9594 BaseType = Ptr->getPointeeType(); 9595 Mode = 1; 9596 DK = diag::ext_catch_incomplete_ptr; 9597 IncompleteCatchIsInvalid = false; 9598 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9599 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9600 BaseType = Ref->getPointeeType(); 9601 Mode = 2; 9602 DK = diag::ext_catch_incomplete_ref; 9603 IncompleteCatchIsInvalid = false; 9604 } 9605 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9606 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9607 IncompleteCatchIsInvalid) 9608 Invalid = true; 9609 9610 if (!Invalid && !ExDeclType->isDependentType() && 9611 RequireNonAbstractType(Loc, ExDeclType, 9612 diag::err_abstract_type_in_decl, 9613 AbstractVariableType)) 9614 Invalid = true; 9615 9616 // Only the non-fragile NeXT runtime currently supports C++ catches 9617 // of ObjC types, and no runtime supports catching ObjC types by value. 9618 if (!Invalid && getLangOptions().ObjC1) { 9619 QualType T = ExDeclType; 9620 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9621 T = RT->getPointeeType(); 9622 9623 if (T->isObjCObjectType()) { 9624 Diag(Loc, diag::err_objc_object_catch); 9625 Invalid = true; 9626 } else if (T->isObjCObjectPointerType()) { 9627 if (!getLangOptions().ObjCNonFragileABI) 9628 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9629 } 9630 } 9631 9632 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9633 ExDeclType, TInfo, SC_None, SC_None); 9634 ExDecl->setExceptionVariable(true); 9635 9636 // In ARC, infer 'retaining' for variables of retainable type. 9637 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9638 Invalid = true; 9639 9640 if (!Invalid && !ExDeclType->isDependentType()) { 9641 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9642 // C++ [except.handle]p16: 9643 // The object declared in an exception-declaration or, if the 9644 // exception-declaration does not specify a name, a temporary (12.2) is 9645 // copy-initialized (8.5) from the exception object. [...] 9646 // The object is destroyed when the handler exits, after the destruction 9647 // of any automatic objects initialized within the handler. 9648 // 9649 // We just pretend to initialize the object with itself, then make sure 9650 // it can be destroyed later. 9651 QualType initType = ExDeclType; 9652 9653 InitializedEntity entity = 9654 InitializedEntity::InitializeVariable(ExDecl); 9655 InitializationKind initKind = 9656 InitializationKind::CreateCopy(Loc, SourceLocation()); 9657 9658 Expr *opaqueValue = 9659 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9660 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9661 ExprResult result = sequence.Perform(*this, entity, initKind, 9662 MultiExprArg(&opaqueValue, 1)); 9663 if (result.isInvalid()) 9664 Invalid = true; 9665 else { 9666 // If the constructor used was non-trivial, set this as the 9667 // "initializer". 9668 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9669 if (!construct->getConstructor()->isTrivial()) { 9670 Expr *init = MaybeCreateExprWithCleanups(construct); 9671 ExDecl->setInit(init); 9672 } 9673 9674 // And make sure it's destructable. 9675 FinalizeVarWithDestructor(ExDecl, recordType); 9676 } 9677 } 9678 } 9679 9680 if (Invalid) 9681 ExDecl->setInvalidDecl(); 9682 9683 return ExDecl; 9684} 9685 9686/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9687/// handler. 9688Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9689 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9690 bool Invalid = D.isInvalidType(); 9691 9692 // Check for unexpanded parameter packs. 9693 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9694 UPPC_ExceptionType)) { 9695 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9696 D.getIdentifierLoc()); 9697 Invalid = true; 9698 } 9699 9700 IdentifierInfo *II = D.getIdentifier(); 9701 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9702 LookupOrdinaryName, 9703 ForRedeclaration)) { 9704 // The scope should be freshly made just for us. There is just no way 9705 // it contains any previous declaration. 9706 assert(!S->isDeclScope(PrevDecl)); 9707 if (PrevDecl->isTemplateParameter()) { 9708 // Maybe we will complain about the shadowed template parameter. 9709 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9710 PrevDecl = 0; 9711 } 9712 } 9713 9714 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9715 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9716 << D.getCXXScopeSpec().getRange(); 9717 Invalid = true; 9718 } 9719 9720 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9721 D.getSourceRange().getBegin(), 9722 D.getIdentifierLoc(), 9723 D.getIdentifier()); 9724 if (Invalid) 9725 ExDecl->setInvalidDecl(); 9726 9727 // Add the exception declaration into this scope. 9728 if (II) 9729 PushOnScopeChains(ExDecl, S); 9730 else 9731 CurContext->addDecl(ExDecl); 9732 9733 ProcessDeclAttributes(S, ExDecl, D); 9734 return ExDecl; 9735} 9736 9737Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9738 Expr *AssertExpr, 9739 Expr *AssertMessageExpr_, 9740 SourceLocation RParenLoc) { 9741 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9742 9743 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9744 llvm::APSInt Cond; 9745 if (VerifyIntegerConstantExpression(AssertExpr, &Cond, 9746 diag::err_static_assert_expression_is_not_constant, 9747 /*AllowFold=*/false)) 9748 return 0; 9749 9750 if (!Cond) 9751 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9752 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9753 } 9754 9755 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9756 return 0; 9757 9758 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9759 AssertExpr, AssertMessage, RParenLoc); 9760 9761 CurContext->addDecl(Decl); 9762 return Decl; 9763} 9764 9765/// \brief Perform semantic analysis of the given friend type declaration. 9766/// 9767/// \returns A friend declaration that. 9768FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9769 SourceLocation FriendLoc, 9770 TypeSourceInfo *TSInfo) { 9771 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9772 9773 QualType T = TSInfo->getType(); 9774 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9775 9776 // C++03 [class.friend]p2: 9777 // An elaborated-type-specifier shall be used in a friend declaration 9778 // for a class.* 9779 // 9780 // * The class-key of the elaborated-type-specifier is required. 9781 if (!ActiveTemplateInstantiations.empty()) { 9782 // Do not complain about the form of friend template types during 9783 // template instantiation; we will already have complained when the 9784 // template was declared. 9785 } else if (!T->isElaboratedTypeSpecifier()) { 9786 // If we evaluated the type to a record type, suggest putting 9787 // a tag in front. 9788 if (const RecordType *RT = T->getAs<RecordType>()) { 9789 RecordDecl *RD = RT->getDecl(); 9790 9791 std::string InsertionText = std::string(" ") + RD->getKindName(); 9792 9793 Diag(TypeRange.getBegin(), 9794 getLangOptions().CPlusPlus0x ? 9795 diag::warn_cxx98_compat_unelaborated_friend_type : 9796 diag::ext_unelaborated_friend_type) 9797 << (unsigned) RD->getTagKind() 9798 << T 9799 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9800 InsertionText); 9801 } else { 9802 Diag(FriendLoc, 9803 getLangOptions().CPlusPlus0x ? 9804 diag::warn_cxx98_compat_nonclass_type_friend : 9805 diag::ext_nonclass_type_friend) 9806 << T 9807 << SourceRange(FriendLoc, TypeRange.getEnd()); 9808 } 9809 } else if (T->getAs<EnumType>()) { 9810 Diag(FriendLoc, 9811 getLangOptions().CPlusPlus0x ? 9812 diag::warn_cxx98_compat_enum_friend : 9813 diag::ext_enum_friend) 9814 << T 9815 << SourceRange(FriendLoc, TypeRange.getEnd()); 9816 } 9817 9818 // C++0x [class.friend]p3: 9819 // If the type specifier in a friend declaration designates a (possibly 9820 // cv-qualified) class type, that class is declared as a friend; otherwise, 9821 // the friend declaration is ignored. 9822 9823 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9824 // in [class.friend]p3 that we do not implement. 9825 9826 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9827} 9828 9829/// Handle a friend tag declaration where the scope specifier was 9830/// templated. 9831Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9832 unsigned TagSpec, SourceLocation TagLoc, 9833 CXXScopeSpec &SS, 9834 IdentifierInfo *Name, SourceLocation NameLoc, 9835 AttributeList *Attr, 9836 MultiTemplateParamsArg TempParamLists) { 9837 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9838 9839 bool isExplicitSpecialization = false; 9840 bool Invalid = false; 9841 9842 if (TemplateParameterList *TemplateParams 9843 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9844 TempParamLists.get(), 9845 TempParamLists.size(), 9846 /*friend*/ true, 9847 isExplicitSpecialization, 9848 Invalid)) { 9849 if (TemplateParams->size() > 0) { 9850 // This is a declaration of a class template. 9851 if (Invalid) 9852 return 0; 9853 9854 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9855 SS, Name, NameLoc, Attr, 9856 TemplateParams, AS_public, 9857 /*ModulePrivateLoc=*/SourceLocation(), 9858 TempParamLists.size() - 1, 9859 (TemplateParameterList**) TempParamLists.release()).take(); 9860 } else { 9861 // The "template<>" header is extraneous. 9862 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9863 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9864 isExplicitSpecialization = true; 9865 } 9866 } 9867 9868 if (Invalid) return 0; 9869 9870 bool isAllExplicitSpecializations = true; 9871 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9872 if (TempParamLists.get()[I]->size()) { 9873 isAllExplicitSpecializations = false; 9874 break; 9875 } 9876 } 9877 9878 // FIXME: don't ignore attributes. 9879 9880 // If it's explicit specializations all the way down, just forget 9881 // about the template header and build an appropriate non-templated 9882 // friend. TODO: for source fidelity, remember the headers. 9883 if (isAllExplicitSpecializations) { 9884 if (SS.isEmpty()) { 9885 bool Owned = false; 9886 bool IsDependent = false; 9887 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9888 Attr, AS_public, 9889 /*ModulePrivateLoc=*/SourceLocation(), 9890 MultiTemplateParamsArg(), Owned, IsDependent, 9891 /*ScopedEnumKWLoc=*/SourceLocation(), 9892 /*ScopedEnumUsesClassTag=*/false, 9893 /*UnderlyingType=*/TypeResult()); 9894 } 9895 9896 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9897 ElaboratedTypeKeyword Keyword 9898 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9899 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9900 *Name, NameLoc); 9901 if (T.isNull()) 9902 return 0; 9903 9904 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9905 if (isa<DependentNameType>(T)) { 9906 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9907 TL.setKeywordLoc(TagLoc); 9908 TL.setQualifierLoc(QualifierLoc); 9909 TL.setNameLoc(NameLoc); 9910 } else { 9911 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9912 TL.setKeywordLoc(TagLoc); 9913 TL.setQualifierLoc(QualifierLoc); 9914 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9915 } 9916 9917 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9918 TSI, FriendLoc); 9919 Friend->setAccess(AS_public); 9920 CurContext->addDecl(Friend); 9921 return Friend; 9922 } 9923 9924 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9925 9926 9927 9928 // Handle the case of a templated-scope friend class. e.g. 9929 // template <class T> class A<T>::B; 9930 // FIXME: we don't support these right now. 9931 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9932 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9933 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9934 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9935 TL.setKeywordLoc(TagLoc); 9936 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9937 TL.setNameLoc(NameLoc); 9938 9939 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9940 TSI, FriendLoc); 9941 Friend->setAccess(AS_public); 9942 Friend->setUnsupportedFriend(true); 9943 CurContext->addDecl(Friend); 9944 return Friend; 9945} 9946 9947 9948/// Handle a friend type declaration. This works in tandem with 9949/// ActOnTag. 9950/// 9951/// Notes on friend class templates: 9952/// 9953/// We generally treat friend class declarations as if they were 9954/// declaring a class. So, for example, the elaborated type specifier 9955/// in a friend declaration is required to obey the restrictions of a 9956/// class-head (i.e. no typedefs in the scope chain), template 9957/// parameters are required to match up with simple template-ids, &c. 9958/// However, unlike when declaring a template specialization, it's 9959/// okay to refer to a template specialization without an empty 9960/// template parameter declaration, e.g. 9961/// friend class A<T>::B<unsigned>; 9962/// We permit this as a special case; if there are any template 9963/// parameters present at all, require proper matching, i.e. 9964/// template <> template <class T> friend class A<int>::B; 9965Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9966 MultiTemplateParamsArg TempParams) { 9967 SourceLocation Loc = DS.getSourceRange().getBegin(); 9968 9969 assert(DS.isFriendSpecified()); 9970 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9971 9972 // Try to convert the decl specifier to a type. This works for 9973 // friend templates because ActOnTag never produces a ClassTemplateDecl 9974 // for a TUK_Friend. 9975 Declarator TheDeclarator(DS, Declarator::MemberContext); 9976 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9977 QualType T = TSI->getType(); 9978 if (TheDeclarator.isInvalidType()) 9979 return 0; 9980 9981 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9982 return 0; 9983 9984 // This is definitely an error in C++98. It's probably meant to 9985 // be forbidden in C++0x, too, but the specification is just 9986 // poorly written. 9987 // 9988 // The problem is with declarations like the following: 9989 // template <T> friend A<T>::foo; 9990 // where deciding whether a class C is a friend or not now hinges 9991 // on whether there exists an instantiation of A that causes 9992 // 'foo' to equal C. There are restrictions on class-heads 9993 // (which we declare (by fiat) elaborated friend declarations to 9994 // be) that makes this tractable. 9995 // 9996 // FIXME: handle "template <> friend class A<T>;", which 9997 // is possibly well-formed? Who even knows? 9998 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9999 Diag(Loc, diag::err_tagless_friend_type_template) 10000 << DS.getSourceRange(); 10001 return 0; 10002 } 10003 10004 // C++98 [class.friend]p1: A friend of a class is a function 10005 // or class that is not a member of the class . . . 10006 // This is fixed in DR77, which just barely didn't make the C++03 10007 // deadline. It's also a very silly restriction that seriously 10008 // affects inner classes and which nobody else seems to implement; 10009 // thus we never diagnose it, not even in -pedantic. 10010 // 10011 // But note that we could warn about it: it's always useless to 10012 // friend one of your own members (it's not, however, worthless to 10013 // friend a member of an arbitrary specialization of your template). 10014 10015 Decl *D; 10016 if (unsigned NumTempParamLists = TempParams.size()) 10017 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10018 NumTempParamLists, 10019 TempParams.release(), 10020 TSI, 10021 DS.getFriendSpecLoc()); 10022 else 10023 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10024 10025 if (!D) 10026 return 0; 10027 10028 D->setAccess(AS_public); 10029 CurContext->addDecl(D); 10030 10031 return D; 10032} 10033 10034Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10035 MultiTemplateParamsArg TemplateParams) { 10036 const DeclSpec &DS = D.getDeclSpec(); 10037 10038 assert(DS.isFriendSpecified()); 10039 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10040 10041 SourceLocation Loc = D.getIdentifierLoc(); 10042 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10043 10044 // C++ [class.friend]p1 10045 // A friend of a class is a function or class.... 10046 // Note that this sees through typedefs, which is intended. 10047 // It *doesn't* see through dependent types, which is correct 10048 // according to [temp.arg.type]p3: 10049 // If a declaration acquires a function type through a 10050 // type dependent on a template-parameter and this causes 10051 // a declaration that does not use the syntactic form of a 10052 // function declarator to have a function type, the program 10053 // is ill-formed. 10054 if (!TInfo->getType()->isFunctionType()) { 10055 Diag(Loc, diag::err_unexpected_friend); 10056 10057 // It might be worthwhile to try to recover by creating an 10058 // appropriate declaration. 10059 return 0; 10060 } 10061 10062 // C++ [namespace.memdef]p3 10063 // - If a friend declaration in a non-local class first declares a 10064 // class or function, the friend class or function is a member 10065 // of the innermost enclosing namespace. 10066 // - The name of the friend is not found by simple name lookup 10067 // until a matching declaration is provided in that namespace 10068 // scope (either before or after the class declaration granting 10069 // friendship). 10070 // - If a friend function is called, its name may be found by the 10071 // name lookup that considers functions from namespaces and 10072 // classes associated with the types of the function arguments. 10073 // - When looking for a prior declaration of a class or a function 10074 // declared as a friend, scopes outside the innermost enclosing 10075 // namespace scope are not considered. 10076 10077 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10078 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10079 DeclarationName Name = NameInfo.getName(); 10080 assert(Name); 10081 10082 // Check for unexpanded parameter packs. 10083 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10084 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10085 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10086 return 0; 10087 10088 // The context we found the declaration in, or in which we should 10089 // create the declaration. 10090 DeclContext *DC; 10091 Scope *DCScope = S; 10092 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10093 ForRedeclaration); 10094 10095 // FIXME: there are different rules in local classes 10096 10097 // There are four cases here. 10098 // - There's no scope specifier, in which case we just go to the 10099 // appropriate scope and look for a function or function template 10100 // there as appropriate. 10101 // Recover from invalid scope qualifiers as if they just weren't there. 10102 if (SS.isInvalid() || !SS.isSet()) { 10103 // C++0x [namespace.memdef]p3: 10104 // If the name in a friend declaration is neither qualified nor 10105 // a template-id and the declaration is a function or an 10106 // elaborated-type-specifier, the lookup to determine whether 10107 // the entity has been previously declared shall not consider 10108 // any scopes outside the innermost enclosing namespace. 10109 // C++0x [class.friend]p11: 10110 // If a friend declaration appears in a local class and the name 10111 // specified is an unqualified name, a prior declaration is 10112 // looked up without considering scopes that are outside the 10113 // innermost enclosing non-class scope. For a friend function 10114 // declaration, if there is no prior declaration, the program is 10115 // ill-formed. 10116 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10117 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10118 10119 // Find the appropriate context according to the above. 10120 DC = CurContext; 10121 while (true) { 10122 // Skip class contexts. If someone can cite chapter and verse 10123 // for this behavior, that would be nice --- it's what GCC and 10124 // EDG do, and it seems like a reasonable intent, but the spec 10125 // really only says that checks for unqualified existing 10126 // declarations should stop at the nearest enclosing namespace, 10127 // not that they should only consider the nearest enclosing 10128 // namespace. 10129 while (DC->isRecord()) 10130 DC = DC->getParent(); 10131 10132 LookupQualifiedName(Previous, DC); 10133 10134 // TODO: decide what we think about using declarations. 10135 if (isLocal || !Previous.empty()) 10136 break; 10137 10138 if (isTemplateId) { 10139 if (isa<TranslationUnitDecl>(DC)) break; 10140 } else { 10141 if (DC->isFileContext()) break; 10142 } 10143 DC = DC->getParent(); 10144 } 10145 10146 // C++ [class.friend]p1: A friend of a class is a function or 10147 // class that is not a member of the class . . . 10148 // C++11 changes this for both friend types and functions. 10149 // Most C++ 98 compilers do seem to give an error here, so 10150 // we do, too. 10151 if (!Previous.empty() && DC->Equals(CurContext)) 10152 Diag(DS.getFriendSpecLoc(), 10153 getLangOptions().CPlusPlus0x ? 10154 diag::warn_cxx98_compat_friend_is_member : 10155 diag::err_friend_is_member); 10156 10157 DCScope = getScopeForDeclContext(S, DC); 10158 10159 // C++ [class.friend]p6: 10160 // A function can be defined in a friend declaration of a class if and 10161 // only if the class is a non-local class (9.8), the function name is 10162 // unqualified, and the function has namespace scope. 10163 if (isLocal && D.isFunctionDefinition()) { 10164 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10165 } 10166 10167 // - There's a non-dependent scope specifier, in which case we 10168 // compute it and do a previous lookup there for a function 10169 // or function template. 10170 } else if (!SS.getScopeRep()->isDependent()) { 10171 DC = computeDeclContext(SS); 10172 if (!DC) return 0; 10173 10174 if (RequireCompleteDeclContext(SS, DC)) return 0; 10175 10176 LookupQualifiedName(Previous, DC); 10177 10178 // Ignore things found implicitly in the wrong scope. 10179 // TODO: better diagnostics for this case. Suggesting the right 10180 // qualified scope would be nice... 10181 LookupResult::Filter F = Previous.makeFilter(); 10182 while (F.hasNext()) { 10183 NamedDecl *D = F.next(); 10184 if (!DC->InEnclosingNamespaceSetOf( 10185 D->getDeclContext()->getRedeclContext())) 10186 F.erase(); 10187 } 10188 F.done(); 10189 10190 if (Previous.empty()) { 10191 D.setInvalidType(); 10192 Diag(Loc, diag::err_qualified_friend_not_found) 10193 << Name << TInfo->getType(); 10194 return 0; 10195 } 10196 10197 // C++ [class.friend]p1: A friend of a class is a function or 10198 // class that is not a member of the class . . . 10199 if (DC->Equals(CurContext)) 10200 Diag(DS.getFriendSpecLoc(), 10201 getLangOptions().CPlusPlus0x ? 10202 diag::warn_cxx98_compat_friend_is_member : 10203 diag::err_friend_is_member); 10204 10205 if (D.isFunctionDefinition()) { 10206 // C++ [class.friend]p6: 10207 // A function can be defined in a friend declaration of a class if and 10208 // only if the class is a non-local class (9.8), the function name is 10209 // unqualified, and the function has namespace scope. 10210 SemaDiagnosticBuilder DB 10211 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10212 10213 DB << SS.getScopeRep(); 10214 if (DC->isFileContext()) 10215 DB << FixItHint::CreateRemoval(SS.getRange()); 10216 SS.clear(); 10217 } 10218 10219 // - There's a scope specifier that does not match any template 10220 // parameter lists, in which case we use some arbitrary context, 10221 // create a method or method template, and wait for instantiation. 10222 // - There's a scope specifier that does match some template 10223 // parameter lists, which we don't handle right now. 10224 } else { 10225 if (D.isFunctionDefinition()) { 10226 // C++ [class.friend]p6: 10227 // A function can be defined in a friend declaration of a class if and 10228 // only if the class is a non-local class (9.8), the function name is 10229 // unqualified, and the function has namespace scope. 10230 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10231 << SS.getScopeRep(); 10232 } 10233 10234 DC = CurContext; 10235 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10236 } 10237 10238 if (!DC->isRecord()) { 10239 // This implies that it has to be an operator or function. 10240 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10241 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10242 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10243 Diag(Loc, diag::err_introducing_special_friend) << 10244 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10245 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10246 return 0; 10247 } 10248 } 10249 10250 // FIXME: This is an egregious hack to cope with cases where the scope stack 10251 // does not contain the declaration context, i.e., in an out-of-line 10252 // definition of a class. 10253 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10254 if (!DCScope) { 10255 FakeDCScope.setEntity(DC); 10256 DCScope = &FakeDCScope; 10257 } 10258 10259 bool AddToScope = true; 10260 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10261 move(TemplateParams), AddToScope); 10262 if (!ND) return 0; 10263 10264 assert(ND->getDeclContext() == DC); 10265 assert(ND->getLexicalDeclContext() == CurContext); 10266 10267 // Add the function declaration to the appropriate lookup tables, 10268 // adjusting the redeclarations list as necessary. We don't 10269 // want to do this yet if the friending class is dependent. 10270 // 10271 // Also update the scope-based lookup if the target context's 10272 // lookup context is in lexical scope. 10273 if (!CurContext->isDependentContext()) { 10274 DC = DC->getRedeclContext(); 10275 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10276 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10277 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10278 } 10279 10280 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10281 D.getIdentifierLoc(), ND, 10282 DS.getFriendSpecLoc()); 10283 FrD->setAccess(AS_public); 10284 CurContext->addDecl(FrD); 10285 10286 if (ND->isInvalidDecl()) 10287 FrD->setInvalidDecl(); 10288 else { 10289 FunctionDecl *FD; 10290 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10291 FD = FTD->getTemplatedDecl(); 10292 else 10293 FD = cast<FunctionDecl>(ND); 10294 10295 // Mark templated-scope function declarations as unsupported. 10296 if (FD->getNumTemplateParameterLists()) 10297 FrD->setUnsupportedFriend(true); 10298 } 10299 10300 return ND; 10301} 10302 10303void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10304 AdjustDeclIfTemplate(Dcl); 10305 10306 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10307 if (!Fn) { 10308 Diag(DelLoc, diag::err_deleted_non_function); 10309 return; 10310 } 10311 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10312 Diag(DelLoc, diag::err_deleted_decl_not_first); 10313 Diag(Prev->getLocation(), diag::note_previous_declaration); 10314 // If the declaration wasn't the first, we delete the function anyway for 10315 // recovery. 10316 } 10317 Fn->setDeletedAsWritten(); 10318} 10319 10320void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10321 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10322 10323 if (MD) { 10324 if (MD->getParent()->isDependentType()) { 10325 MD->setDefaulted(); 10326 MD->setExplicitlyDefaulted(); 10327 return; 10328 } 10329 10330 CXXSpecialMember Member = getSpecialMember(MD); 10331 if (Member == CXXInvalid) { 10332 Diag(DefaultLoc, diag::err_default_special_members); 10333 return; 10334 } 10335 10336 MD->setDefaulted(); 10337 MD->setExplicitlyDefaulted(); 10338 10339 // If this definition appears within the record, do the checking when 10340 // the record is complete. 10341 const FunctionDecl *Primary = MD; 10342 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10343 // Find the uninstantiated declaration that actually had the '= default' 10344 // on it. 10345 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10346 10347 if (Primary == Primary->getCanonicalDecl()) 10348 return; 10349 10350 switch (Member) { 10351 case CXXDefaultConstructor: { 10352 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10353 CheckExplicitlyDefaultedDefaultConstructor(CD); 10354 if (!CD->isInvalidDecl()) 10355 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10356 break; 10357 } 10358 10359 case CXXCopyConstructor: { 10360 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10361 CheckExplicitlyDefaultedCopyConstructor(CD); 10362 if (!CD->isInvalidDecl()) 10363 DefineImplicitCopyConstructor(DefaultLoc, CD); 10364 break; 10365 } 10366 10367 case CXXCopyAssignment: { 10368 CheckExplicitlyDefaultedCopyAssignment(MD); 10369 if (!MD->isInvalidDecl()) 10370 DefineImplicitCopyAssignment(DefaultLoc, MD); 10371 break; 10372 } 10373 10374 case CXXDestructor: { 10375 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10376 CheckExplicitlyDefaultedDestructor(DD); 10377 if (!DD->isInvalidDecl()) 10378 DefineImplicitDestructor(DefaultLoc, DD); 10379 break; 10380 } 10381 10382 case CXXMoveConstructor: { 10383 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10384 CheckExplicitlyDefaultedMoveConstructor(CD); 10385 if (!CD->isInvalidDecl()) 10386 DefineImplicitMoveConstructor(DefaultLoc, CD); 10387 break; 10388 } 10389 10390 case CXXMoveAssignment: { 10391 CheckExplicitlyDefaultedMoveAssignment(MD); 10392 if (!MD->isInvalidDecl()) 10393 DefineImplicitMoveAssignment(DefaultLoc, MD); 10394 break; 10395 } 10396 10397 case CXXInvalid: 10398 llvm_unreachable("Invalid special member."); 10399 } 10400 } else { 10401 Diag(DefaultLoc, diag::err_default_special_members); 10402 } 10403} 10404 10405static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10406 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10407 Stmt *SubStmt = *CI; 10408 if (!SubStmt) 10409 continue; 10410 if (isa<ReturnStmt>(SubStmt)) 10411 Self.Diag(SubStmt->getSourceRange().getBegin(), 10412 diag::err_return_in_constructor_handler); 10413 if (!isa<Expr>(SubStmt)) 10414 SearchForReturnInStmt(Self, SubStmt); 10415 } 10416} 10417 10418void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10419 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10420 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10421 SearchForReturnInStmt(*this, Handler); 10422 } 10423} 10424 10425bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10426 const CXXMethodDecl *Old) { 10427 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10428 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10429 10430 if (Context.hasSameType(NewTy, OldTy) || 10431 NewTy->isDependentType() || OldTy->isDependentType()) 10432 return false; 10433 10434 // Check if the return types are covariant 10435 QualType NewClassTy, OldClassTy; 10436 10437 /// Both types must be pointers or references to classes. 10438 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10439 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10440 NewClassTy = NewPT->getPointeeType(); 10441 OldClassTy = OldPT->getPointeeType(); 10442 } 10443 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10444 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10445 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10446 NewClassTy = NewRT->getPointeeType(); 10447 OldClassTy = OldRT->getPointeeType(); 10448 } 10449 } 10450 } 10451 10452 // The return types aren't either both pointers or references to a class type. 10453 if (NewClassTy.isNull()) { 10454 Diag(New->getLocation(), 10455 diag::err_different_return_type_for_overriding_virtual_function) 10456 << New->getDeclName() << NewTy << OldTy; 10457 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10458 10459 return true; 10460 } 10461 10462 // C++ [class.virtual]p6: 10463 // If the return type of D::f differs from the return type of B::f, the 10464 // class type in the return type of D::f shall be complete at the point of 10465 // declaration of D::f or shall be the class type D. 10466 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10467 if (!RT->isBeingDefined() && 10468 RequireCompleteType(New->getLocation(), NewClassTy, 10469 PDiag(diag::err_covariant_return_incomplete) 10470 << New->getDeclName())) 10471 return true; 10472 } 10473 10474 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10475 // Check if the new class derives from the old class. 10476 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10477 Diag(New->getLocation(), 10478 diag::err_covariant_return_not_derived) 10479 << New->getDeclName() << NewTy << OldTy; 10480 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10481 return true; 10482 } 10483 10484 // Check if we the conversion from derived to base is valid. 10485 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10486 diag::err_covariant_return_inaccessible_base, 10487 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10488 // FIXME: Should this point to the return type? 10489 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10490 // FIXME: this note won't trigger for delayed access control 10491 // diagnostics, and it's impossible to get an undelayed error 10492 // here from access control during the original parse because 10493 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10494 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10495 return true; 10496 } 10497 } 10498 10499 // The qualifiers of the return types must be the same. 10500 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10501 Diag(New->getLocation(), 10502 diag::err_covariant_return_type_different_qualifications) 10503 << New->getDeclName() << NewTy << OldTy; 10504 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10505 return true; 10506 }; 10507 10508 10509 // The new class type must have the same or less qualifiers as the old type. 10510 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10511 Diag(New->getLocation(), 10512 diag::err_covariant_return_type_class_type_more_qualified) 10513 << New->getDeclName() << NewTy << OldTy; 10514 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10515 return true; 10516 }; 10517 10518 return false; 10519} 10520 10521/// \brief Mark the given method pure. 10522/// 10523/// \param Method the method to be marked pure. 10524/// 10525/// \param InitRange the source range that covers the "0" initializer. 10526bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10527 SourceLocation EndLoc = InitRange.getEnd(); 10528 if (EndLoc.isValid()) 10529 Method->setRangeEnd(EndLoc); 10530 10531 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10532 Method->setPure(); 10533 return false; 10534 } 10535 10536 if (!Method->isInvalidDecl()) 10537 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10538 << Method->getDeclName() << InitRange; 10539 return true; 10540} 10541 10542/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10543/// an initializer for the out-of-line declaration 'Dcl'. The scope 10544/// is a fresh scope pushed for just this purpose. 10545/// 10546/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10547/// static data member of class X, names should be looked up in the scope of 10548/// class X. 10549void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10550 // If there is no declaration, there was an error parsing it. 10551 if (D == 0 || D->isInvalidDecl()) return; 10552 10553 // We should only get called for declarations with scope specifiers, like: 10554 // int foo::bar; 10555 assert(D->isOutOfLine()); 10556 EnterDeclaratorContext(S, D->getDeclContext()); 10557} 10558 10559/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10560/// initializer for the out-of-line declaration 'D'. 10561void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10562 // If there is no declaration, there was an error parsing it. 10563 if (D == 0 || D->isInvalidDecl()) return; 10564 10565 assert(D->isOutOfLine()); 10566 ExitDeclaratorContext(S); 10567} 10568 10569/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10570/// C++ if/switch/while/for statement. 10571/// e.g: "if (int x = f()) {...}" 10572DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10573 // C++ 6.4p2: 10574 // The declarator shall not specify a function or an array. 10575 // The type-specifier-seq shall not contain typedef and shall not declare a 10576 // new class or enumeration. 10577 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10578 "Parser allowed 'typedef' as storage class of condition decl."); 10579 10580 Decl *Dcl = ActOnDeclarator(S, D); 10581 if (!Dcl) 10582 return true; 10583 10584 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10585 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10586 << D.getSourceRange(); 10587 return true; 10588 } 10589 10590 return Dcl; 10591} 10592 10593void Sema::LoadExternalVTableUses() { 10594 if (!ExternalSource) 10595 return; 10596 10597 SmallVector<ExternalVTableUse, 4> VTables; 10598 ExternalSource->ReadUsedVTables(VTables); 10599 SmallVector<VTableUse, 4> NewUses; 10600 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10601 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10602 = VTablesUsed.find(VTables[I].Record); 10603 // Even if a definition wasn't required before, it may be required now. 10604 if (Pos != VTablesUsed.end()) { 10605 if (!Pos->second && VTables[I].DefinitionRequired) 10606 Pos->second = true; 10607 continue; 10608 } 10609 10610 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10611 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10612 } 10613 10614 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10615} 10616 10617void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10618 bool DefinitionRequired) { 10619 // Ignore any vtable uses in unevaluated operands or for classes that do 10620 // not have a vtable. 10621 if (!Class->isDynamicClass() || Class->isDependentContext() || 10622 CurContext->isDependentContext() || 10623 ExprEvalContexts.back().Context == Unevaluated || 10624 ExprEvalContexts.back().Context == ConstantEvaluated) 10625 return; 10626 10627 // Try to insert this class into the map. 10628 LoadExternalVTableUses(); 10629 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10630 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10631 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10632 if (!Pos.second) { 10633 // If we already had an entry, check to see if we are promoting this vtable 10634 // to required a definition. If so, we need to reappend to the VTableUses 10635 // list, since we may have already processed the first entry. 10636 if (DefinitionRequired && !Pos.first->second) { 10637 Pos.first->second = true; 10638 } else { 10639 // Otherwise, we can early exit. 10640 return; 10641 } 10642 } 10643 10644 // Local classes need to have their virtual members marked 10645 // immediately. For all other classes, we mark their virtual members 10646 // at the end of the translation unit. 10647 if (Class->isLocalClass()) 10648 MarkVirtualMembersReferenced(Loc, Class); 10649 else 10650 VTableUses.push_back(std::make_pair(Class, Loc)); 10651} 10652 10653bool Sema::DefineUsedVTables() { 10654 LoadExternalVTableUses(); 10655 if (VTableUses.empty()) 10656 return false; 10657 10658 // Note: The VTableUses vector could grow as a result of marking 10659 // the members of a class as "used", so we check the size each 10660 // time through the loop and prefer indices (with are stable) to 10661 // iterators (which are not). 10662 bool DefinedAnything = false; 10663 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10664 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10665 if (!Class) 10666 continue; 10667 10668 SourceLocation Loc = VTableUses[I].second; 10669 10670 // If this class has a key function, but that key function is 10671 // defined in another translation unit, we don't need to emit the 10672 // vtable even though we're using it. 10673 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10674 if (KeyFunction && !KeyFunction->hasBody()) { 10675 switch (KeyFunction->getTemplateSpecializationKind()) { 10676 case TSK_Undeclared: 10677 case TSK_ExplicitSpecialization: 10678 case TSK_ExplicitInstantiationDeclaration: 10679 // The key function is in another translation unit. 10680 continue; 10681 10682 case TSK_ExplicitInstantiationDefinition: 10683 case TSK_ImplicitInstantiation: 10684 // We will be instantiating the key function. 10685 break; 10686 } 10687 } else if (!KeyFunction) { 10688 // If we have a class with no key function that is the subject 10689 // of an explicit instantiation declaration, suppress the 10690 // vtable; it will live with the explicit instantiation 10691 // definition. 10692 bool IsExplicitInstantiationDeclaration 10693 = Class->getTemplateSpecializationKind() 10694 == TSK_ExplicitInstantiationDeclaration; 10695 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10696 REnd = Class->redecls_end(); 10697 R != REnd; ++R) { 10698 TemplateSpecializationKind TSK 10699 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10700 if (TSK == TSK_ExplicitInstantiationDeclaration) 10701 IsExplicitInstantiationDeclaration = true; 10702 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10703 IsExplicitInstantiationDeclaration = false; 10704 break; 10705 } 10706 } 10707 10708 if (IsExplicitInstantiationDeclaration) 10709 continue; 10710 } 10711 10712 // Mark all of the virtual members of this class as referenced, so 10713 // that we can build a vtable. Then, tell the AST consumer that a 10714 // vtable for this class is required. 10715 DefinedAnything = true; 10716 MarkVirtualMembersReferenced(Loc, Class); 10717 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10718 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10719 10720 // Optionally warn if we're emitting a weak vtable. 10721 if (Class->getLinkage() == ExternalLinkage && 10722 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10723 const FunctionDecl *KeyFunctionDef = 0; 10724 if (!KeyFunction || 10725 (KeyFunction->hasBody(KeyFunctionDef) && 10726 KeyFunctionDef->isInlined())) 10727 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10728 TSK_ExplicitInstantiationDefinition 10729 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10730 << Class; 10731 } 10732 } 10733 VTableUses.clear(); 10734 10735 return DefinedAnything; 10736} 10737 10738void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10739 const CXXRecordDecl *RD) { 10740 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10741 e = RD->method_end(); i != e; ++i) { 10742 CXXMethodDecl *MD = *i; 10743 10744 // C++ [basic.def.odr]p2: 10745 // [...] A virtual member function is used if it is not pure. [...] 10746 if (MD->isVirtual() && !MD->isPure()) 10747 MarkDeclarationReferenced(Loc, MD); 10748 } 10749 10750 // Only classes that have virtual bases need a VTT. 10751 if (RD->getNumVBases() == 0) 10752 return; 10753 10754 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10755 e = RD->bases_end(); i != e; ++i) { 10756 const CXXRecordDecl *Base = 10757 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10758 if (Base->getNumVBases() == 0) 10759 continue; 10760 MarkVirtualMembersReferenced(Loc, Base); 10761 } 10762} 10763 10764/// SetIvarInitializers - This routine builds initialization ASTs for the 10765/// Objective-C implementation whose ivars need be initialized. 10766void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10767 if (!getLangOptions().CPlusPlus) 10768 return; 10769 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10770 SmallVector<ObjCIvarDecl*, 8> ivars; 10771 CollectIvarsToConstructOrDestruct(OID, ivars); 10772 if (ivars.empty()) 10773 return; 10774 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10775 for (unsigned i = 0; i < ivars.size(); i++) { 10776 FieldDecl *Field = ivars[i]; 10777 if (Field->isInvalidDecl()) 10778 continue; 10779 10780 CXXCtorInitializer *Member; 10781 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10782 InitializationKind InitKind = 10783 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10784 10785 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10786 ExprResult MemberInit = 10787 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10788 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10789 // Note, MemberInit could actually come back empty if no initialization 10790 // is required (e.g., because it would call a trivial default constructor) 10791 if (!MemberInit.get() || MemberInit.isInvalid()) 10792 continue; 10793 10794 Member = 10795 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10796 SourceLocation(), 10797 MemberInit.takeAs<Expr>(), 10798 SourceLocation()); 10799 AllToInit.push_back(Member); 10800 10801 // Be sure that the destructor is accessible and is marked as referenced. 10802 if (const RecordType *RecordTy 10803 = Context.getBaseElementType(Field->getType()) 10804 ->getAs<RecordType>()) { 10805 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10806 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10807 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10808 CheckDestructorAccess(Field->getLocation(), Destructor, 10809 PDiag(diag::err_access_dtor_ivar) 10810 << Context.getBaseElementType(Field->getType())); 10811 } 10812 } 10813 } 10814 ObjCImplementation->setIvarInitializers(Context, 10815 AllToInit.data(), AllToInit.size()); 10816 } 10817} 10818 10819static 10820void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10821 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10822 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10823 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10824 Sema &S) { 10825 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10826 CE = Current.end(); 10827 if (Ctor->isInvalidDecl()) 10828 return; 10829 10830 const FunctionDecl *FNTarget = 0; 10831 CXXConstructorDecl *Target; 10832 10833 // We ignore the result here since if we don't have a body, Target will be 10834 // null below. 10835 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10836 Target 10837= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10838 10839 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10840 // Avoid dereferencing a null pointer here. 10841 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10842 10843 if (!Current.insert(Canonical)) 10844 return; 10845 10846 // We know that beyond here, we aren't chaining into a cycle. 10847 if (!Target || !Target->isDelegatingConstructor() || 10848 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10849 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10850 Valid.insert(*CI); 10851 Current.clear(); 10852 // We've hit a cycle. 10853 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10854 Current.count(TCanonical)) { 10855 // If we haven't diagnosed this cycle yet, do so now. 10856 if (!Invalid.count(TCanonical)) { 10857 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10858 diag::warn_delegating_ctor_cycle) 10859 << Ctor; 10860 10861 // Don't add a note for a function delegating directo to itself. 10862 if (TCanonical != Canonical) 10863 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10864 10865 CXXConstructorDecl *C = Target; 10866 while (C->getCanonicalDecl() != Canonical) { 10867 (void)C->getTargetConstructor()->hasBody(FNTarget); 10868 assert(FNTarget && "Ctor cycle through bodiless function"); 10869 10870 C 10871 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10872 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10873 } 10874 } 10875 10876 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10877 Invalid.insert(*CI); 10878 Current.clear(); 10879 } else { 10880 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10881 } 10882} 10883 10884 10885void Sema::CheckDelegatingCtorCycles() { 10886 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10887 10888 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10889 CE = Current.end(); 10890 10891 for (DelegatingCtorDeclsType::iterator 10892 I = DelegatingCtorDecls.begin(ExternalSource), 10893 E = DelegatingCtorDecls.end(); 10894 I != E; ++I) { 10895 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10896 } 10897 10898 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10899 (*CI)->setInvalidDecl(); 10900} 10901 10902/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10903Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10904 // Implicitly declared functions (e.g. copy constructors) are 10905 // __host__ __device__ 10906 if (D->isImplicit()) 10907 return CFT_HostDevice; 10908 10909 if (D->hasAttr<CUDAGlobalAttr>()) 10910 return CFT_Global; 10911 10912 if (D->hasAttr<CUDADeviceAttr>()) { 10913 if (D->hasAttr<CUDAHostAttr>()) 10914 return CFT_HostDevice; 10915 else 10916 return CFT_Device; 10917 } 10918 10919 return CFT_Host; 10920} 10921 10922bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10923 CUDAFunctionTarget CalleeTarget) { 10924 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10925 // Callable from the device only." 10926 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10927 return true; 10928 10929 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10930 // Callable from the host only." 10931 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10932 // Callable from the host only." 10933 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10934 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10935 return true; 10936 10937 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10938 return true; 10939 10940 return false; 10941} 10942