SemaDeclCXX.cpp revision 7d5e6948e6a4e04ee67b607f931d90d3063579f2
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 are namespaces. 1751class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1752 public: 1753 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1754 : ClassDecl(ClassDecl) {} 1755 1756 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1757 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1758 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1759 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1760 else 1761 return isa<TypeDecl>(ND); 1762 } 1763 return false; 1764 } 1765 1766 private: 1767 CXXRecordDecl *ClassDecl; 1768}; 1769 1770} 1771 1772/// \brief Handle a C++ member initializer. 1773MemInitResult 1774Sema::BuildMemInitializer(Decl *ConstructorD, 1775 Scope *S, 1776 CXXScopeSpec &SS, 1777 IdentifierInfo *MemberOrBase, 1778 ParsedType TemplateTypeTy, 1779 SourceLocation IdLoc, 1780 const MultiInitializer &Args, 1781 SourceLocation EllipsisLoc) { 1782 if (!ConstructorD) 1783 return true; 1784 1785 AdjustDeclIfTemplate(ConstructorD); 1786 1787 CXXConstructorDecl *Constructor 1788 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1789 if (!Constructor) { 1790 // The user wrote a constructor initializer on a function that is 1791 // not a C++ constructor. Ignore the error for now, because we may 1792 // have more member initializers coming; we'll diagnose it just 1793 // once in ActOnMemInitializers. 1794 return true; 1795 } 1796 1797 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1798 1799 // C++ [class.base.init]p2: 1800 // Names in a mem-initializer-id are looked up in the scope of the 1801 // constructor's class and, if not found in that scope, are looked 1802 // up in the scope containing the constructor's definition. 1803 // [Note: if the constructor's class contains a member with the 1804 // same name as a direct or virtual base class of the class, a 1805 // mem-initializer-id naming the member or base class and composed 1806 // of a single identifier refers to the class member. A 1807 // mem-initializer-id for the hidden base class may be specified 1808 // using a qualified name. ] 1809 if (!SS.getScopeRep() && !TemplateTypeTy) { 1810 // Look for a member, first. 1811 DeclContext::lookup_result Result 1812 = ClassDecl->lookup(MemberOrBase); 1813 if (Result.first != Result.second) { 1814 ValueDecl *Member; 1815 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1816 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1817 if (EllipsisLoc.isValid()) 1818 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1819 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1820 1821 return BuildMemberInitializer(Member, Args, IdLoc); 1822 } 1823 } 1824 } 1825 // It didn't name a member, so see if it names a class. 1826 QualType BaseType; 1827 TypeSourceInfo *TInfo = 0; 1828 1829 if (TemplateTypeTy) { 1830 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1831 } else { 1832 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1833 LookupParsedName(R, S, &SS); 1834 1835 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1836 if (!TyD) { 1837 if (R.isAmbiguous()) return true; 1838 1839 // We don't want access-control diagnostics here. 1840 R.suppressDiagnostics(); 1841 1842 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1843 bool NotUnknownSpecialization = false; 1844 DeclContext *DC = computeDeclContext(SS, false); 1845 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1846 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1847 1848 if (!NotUnknownSpecialization) { 1849 // When the scope specifier can refer to a member of an unknown 1850 // specialization, we take it as a type name. 1851 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1852 SS.getWithLocInContext(Context), 1853 *MemberOrBase, IdLoc); 1854 if (BaseType.isNull()) 1855 return true; 1856 1857 R.clear(); 1858 R.setLookupName(MemberOrBase); 1859 } 1860 } 1861 1862 // If no results were found, try to correct typos. 1863 TypoCorrection Corr; 1864 MemInitializerValidatorCCC Validator(ClassDecl); 1865 if (R.empty() && BaseType.isNull() && 1866 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1867 &Validator, ClassDecl))) { 1868 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1869 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1870 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1871 // We have found a non-static data member with a similar 1872 // name to what was typed; complain and initialize that 1873 // member. 1874 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1875 << MemberOrBase << true << CorrectedQuotedStr 1876 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1877 Diag(Member->getLocation(), diag::note_previous_decl) 1878 << CorrectedQuotedStr; 1879 1880 return BuildMemberInitializer(Member, Args, IdLoc); 1881 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1882 const CXXBaseSpecifier *DirectBaseSpec; 1883 const CXXBaseSpecifier *VirtualBaseSpec; 1884 if (FindBaseInitializer(*this, ClassDecl, 1885 Context.getTypeDeclType(Type), 1886 DirectBaseSpec, VirtualBaseSpec)) { 1887 // We have found a direct or virtual base class with a 1888 // similar name to what was typed; complain and initialize 1889 // that base class. 1890 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1891 << MemberOrBase << false << CorrectedQuotedStr 1892 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1893 1894 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1895 : VirtualBaseSpec; 1896 Diag(BaseSpec->getSourceRange().getBegin(), 1897 diag::note_base_class_specified_here) 1898 << BaseSpec->getType() 1899 << BaseSpec->getSourceRange(); 1900 1901 TyD = Type; 1902 } 1903 } 1904 } 1905 1906 if (!TyD && BaseType.isNull()) { 1907 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1908 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1909 return true; 1910 } 1911 } 1912 1913 if (BaseType.isNull()) { 1914 BaseType = Context.getTypeDeclType(TyD); 1915 if (SS.isSet()) { 1916 NestedNameSpecifier *Qualifier = 1917 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1918 1919 // FIXME: preserve source range information 1920 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1921 } 1922 } 1923 } 1924 1925 if (!TInfo) 1926 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1927 1928 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1929} 1930 1931/// Checks a member initializer expression for cases where reference (or 1932/// pointer) members are bound to by-value parameters (or their addresses). 1933static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1934 Expr *Init, 1935 SourceLocation IdLoc) { 1936 QualType MemberTy = Member->getType(); 1937 1938 // We only handle pointers and references currently. 1939 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1940 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1941 return; 1942 1943 const bool IsPointer = MemberTy->isPointerType(); 1944 if (IsPointer) { 1945 if (const UnaryOperator *Op 1946 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1947 // The only case we're worried about with pointers requires taking the 1948 // address. 1949 if (Op->getOpcode() != UO_AddrOf) 1950 return; 1951 1952 Init = Op->getSubExpr(); 1953 } else { 1954 // We only handle address-of expression initializers for pointers. 1955 return; 1956 } 1957 } 1958 1959 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1960 // Taking the address of a temporary will be diagnosed as a hard error. 1961 if (IsPointer) 1962 return; 1963 1964 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1965 << Member << Init->getSourceRange(); 1966 } else if (const DeclRefExpr *DRE 1967 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1968 // We only warn when referring to a non-reference parameter declaration. 1969 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1970 if (!Parameter || Parameter->getType()->isReferenceType()) 1971 return; 1972 1973 S.Diag(Init->getExprLoc(), 1974 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1975 : diag::warn_bind_ref_member_to_parameter) 1976 << Member << Parameter << Init->getSourceRange(); 1977 } else { 1978 // Other initializers are fine. 1979 return; 1980 } 1981 1982 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1983 << (unsigned)IsPointer; 1984} 1985 1986/// Checks an initializer expression for use of uninitialized fields, such as 1987/// containing the field that is being initialized. Returns true if there is an 1988/// uninitialized field was used an updates the SourceLocation parameter; false 1989/// otherwise. 1990static bool InitExprContainsUninitializedFields(const Stmt *S, 1991 const ValueDecl *LhsField, 1992 SourceLocation *L) { 1993 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1994 1995 if (isa<CallExpr>(S)) { 1996 // Do not descend into function calls or constructors, as the use 1997 // of an uninitialized field may be valid. One would have to inspect 1998 // the contents of the function/ctor to determine if it is safe or not. 1999 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2000 // may be safe, depending on what the function/ctor does. 2001 return false; 2002 } 2003 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2004 const NamedDecl *RhsField = ME->getMemberDecl(); 2005 2006 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2007 // The member expression points to a static data member. 2008 assert(VD->isStaticDataMember() && 2009 "Member points to non-static data member!"); 2010 (void)VD; 2011 return false; 2012 } 2013 2014 if (isa<EnumConstantDecl>(RhsField)) { 2015 // The member expression points to an enum. 2016 return false; 2017 } 2018 2019 if (RhsField == LhsField) { 2020 // Initializing a field with itself. Throw a warning. 2021 // But wait; there are exceptions! 2022 // Exception #1: The field may not belong to this record. 2023 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2024 const Expr *base = ME->getBase(); 2025 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2026 // Even though the field matches, it does not belong to this record. 2027 return false; 2028 } 2029 // None of the exceptions triggered; return true to indicate an 2030 // uninitialized field was used. 2031 *L = ME->getMemberLoc(); 2032 return true; 2033 } 2034 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2035 // sizeof/alignof doesn't reference contents, do not warn. 2036 return false; 2037 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2038 // address-of doesn't reference contents (the pointer may be dereferenced 2039 // in the same expression but it would be rare; and weird). 2040 if (UOE->getOpcode() == UO_AddrOf) 2041 return false; 2042 } 2043 for (Stmt::const_child_range it = S->children(); it; ++it) { 2044 if (!*it) { 2045 // An expression such as 'member(arg ?: "")' may trigger this. 2046 continue; 2047 } 2048 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2049 return true; 2050 } 2051 return false; 2052} 2053 2054MemInitResult 2055Sema::BuildMemberInitializer(ValueDecl *Member, 2056 const MultiInitializer &Args, 2057 SourceLocation IdLoc) { 2058 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2059 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2060 assert((DirectMember || IndirectMember) && 2061 "Member must be a FieldDecl or IndirectFieldDecl"); 2062 2063 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2064 return true; 2065 2066 if (Member->isInvalidDecl()) 2067 return true; 2068 2069 // Diagnose value-uses of fields to initialize themselves, e.g. 2070 // foo(foo) 2071 // where foo is not also a parameter to the constructor. 2072 // TODO: implement -Wuninitialized and fold this into that framework. 2073 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2074 I != E; ++I) { 2075 SourceLocation L; 2076 Expr *Arg = *I; 2077 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2078 Arg = DIE->getInit(); 2079 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2080 // FIXME: Return true in the case when other fields are used before being 2081 // uninitialized. For example, let this field be the i'th field. When 2082 // initializing the i'th field, throw a warning if any of the >= i'th 2083 // fields are used, as they are not yet initialized. 2084 // Right now we are only handling the case where the i'th field uses 2085 // itself in its initializer. 2086 Diag(L, diag::warn_field_is_uninit); 2087 } 2088 } 2089 2090 bool HasDependentArg = Args.isTypeDependent(); 2091 2092 Expr *Init; 2093 if (Member->getType()->isDependentType() || HasDependentArg) { 2094 // Can't check initialization for a member of dependent type or when 2095 // any of the arguments are type-dependent expressions. 2096 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2097 2098 DiscardCleanupsInEvaluationContext(); 2099 } else { 2100 // Initialize the member. 2101 InitializedEntity MemberEntity = 2102 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2103 : InitializedEntity::InitializeMember(IndirectMember, 0); 2104 InitializationKind Kind = 2105 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2106 Args.getEndLoc()); 2107 2108 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2109 if (MemberInit.isInvalid()) 2110 return true; 2111 2112 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2113 2114 // C++0x [class.base.init]p7: 2115 // The initialization of each base and member constitutes a 2116 // full-expression. 2117 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2118 if (MemberInit.isInvalid()) 2119 return true; 2120 2121 // If we are in a dependent context, template instantiation will 2122 // perform this type-checking again. Just save the arguments that we 2123 // received in a ParenListExpr. 2124 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2125 // of the information that we have about the member 2126 // initializer. However, deconstructing the ASTs is a dicey process, 2127 // and this approach is far more likely to get the corner cases right. 2128 if (CurContext->isDependentContext()) { 2129 Init = Args.CreateInitExpr(Context, 2130 Member->getType().getNonReferenceType()); 2131 } else { 2132 Init = MemberInit.get(); 2133 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2134 } 2135 } 2136 2137 if (DirectMember) { 2138 return new (Context) CXXCtorInitializer(Context, DirectMember, 2139 IdLoc, Args.getStartLoc(), 2140 Init, Args.getEndLoc()); 2141 } else { 2142 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2143 IdLoc, Args.getStartLoc(), 2144 Init, Args.getEndLoc()); 2145 } 2146} 2147 2148MemInitResult 2149Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2150 const MultiInitializer &Args, 2151 CXXRecordDecl *ClassDecl) { 2152 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2153 if (!LangOpts.CPlusPlus0x) 2154 return Diag(NameLoc, diag::err_delegating_ctor) 2155 << TInfo->getTypeLoc().getLocalSourceRange(); 2156 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2157 2158 // Initialize the object. 2159 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2160 QualType(ClassDecl->getTypeForDecl(), 0)); 2161 InitializationKind Kind = 2162 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2163 Args.getEndLoc()); 2164 2165 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2166 if (DelegationInit.isInvalid()) 2167 return true; 2168 2169 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2170 "Delegating constructor with no target?"); 2171 2172 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2173 2174 // C++0x [class.base.init]p7: 2175 // The initialization of each base and member constitutes a 2176 // full-expression. 2177 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2178 if (DelegationInit.isInvalid()) 2179 return true; 2180 2181 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2182 DelegationInit.takeAs<Expr>(), 2183 Args.getEndLoc()); 2184} 2185 2186MemInitResult 2187Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2188 const MultiInitializer &Args, 2189 CXXRecordDecl *ClassDecl, 2190 SourceLocation EllipsisLoc) { 2191 bool HasDependentArg = Args.isTypeDependent(); 2192 2193 SourceLocation BaseLoc 2194 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2195 2196 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2197 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2198 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2199 2200 // C++ [class.base.init]p2: 2201 // [...] Unless the mem-initializer-id names a nonstatic data 2202 // member of the constructor's class or a direct or virtual base 2203 // of that class, the mem-initializer is ill-formed. A 2204 // mem-initializer-list can initialize a base class using any 2205 // name that denotes that base class type. 2206 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2207 2208 if (EllipsisLoc.isValid()) { 2209 // This is a pack expansion. 2210 if (!BaseType->containsUnexpandedParameterPack()) { 2211 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2212 << SourceRange(BaseLoc, Args.getEndLoc()); 2213 2214 EllipsisLoc = SourceLocation(); 2215 } 2216 } else { 2217 // Check for any unexpanded parameter packs. 2218 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2219 return true; 2220 2221 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2222 return true; 2223 } 2224 2225 // Check for direct and virtual base classes. 2226 const CXXBaseSpecifier *DirectBaseSpec = 0; 2227 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2228 if (!Dependent) { 2229 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2230 BaseType)) 2231 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2232 2233 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2234 VirtualBaseSpec); 2235 2236 // C++ [base.class.init]p2: 2237 // Unless the mem-initializer-id names a nonstatic data member of the 2238 // constructor's class or a direct or virtual base of that class, the 2239 // mem-initializer is ill-formed. 2240 if (!DirectBaseSpec && !VirtualBaseSpec) { 2241 // If the class has any dependent bases, then it's possible that 2242 // one of those types will resolve to the same type as 2243 // BaseType. Therefore, just treat this as a dependent base 2244 // class initialization. FIXME: Should we try to check the 2245 // initialization anyway? It seems odd. 2246 if (ClassDecl->hasAnyDependentBases()) 2247 Dependent = true; 2248 else 2249 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2250 << BaseType << Context.getTypeDeclType(ClassDecl) 2251 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 } 2253 } 2254 2255 if (Dependent) { 2256 // Can't check initialization for a base of dependent type or when 2257 // any of the arguments are type-dependent expressions. 2258 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2259 2260 DiscardCleanupsInEvaluationContext(); 2261 2262 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2263 /*IsVirtual=*/false, 2264 Args.getStartLoc(), BaseInit, 2265 Args.getEndLoc(), EllipsisLoc); 2266 } 2267 2268 // C++ [base.class.init]p2: 2269 // If a mem-initializer-id is ambiguous because it designates both 2270 // a direct non-virtual base class and an inherited virtual base 2271 // class, the mem-initializer is ill-formed. 2272 if (DirectBaseSpec && VirtualBaseSpec) 2273 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2274 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2275 2276 CXXBaseSpecifier *BaseSpec 2277 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2278 if (!BaseSpec) 2279 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2280 2281 // Initialize the base. 2282 InitializedEntity BaseEntity = 2283 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2284 InitializationKind Kind = 2285 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2286 Args.getEndLoc()); 2287 2288 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2289 if (BaseInit.isInvalid()) 2290 return true; 2291 2292 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2293 2294 // C++0x [class.base.init]p7: 2295 // The initialization of each base and member constitutes a 2296 // full-expression. 2297 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2298 if (BaseInit.isInvalid()) 2299 return true; 2300 2301 // If we are in a dependent context, template instantiation will 2302 // perform this type-checking again. Just save the arguments that we 2303 // received in a ParenListExpr. 2304 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2305 // of the information that we have about the base 2306 // initializer. However, deconstructing the ASTs is a dicey process, 2307 // and this approach is far more likely to get the corner cases right. 2308 if (CurContext->isDependentContext()) 2309 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2310 2311 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2312 BaseSpec->isVirtual(), 2313 Args.getStartLoc(), 2314 BaseInit.takeAs<Expr>(), 2315 Args.getEndLoc(), EllipsisLoc); 2316} 2317 2318// Create a static_cast\<T&&>(expr). 2319static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2320 QualType ExprType = E->getType(); 2321 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2322 SourceLocation ExprLoc = E->getLocStart(); 2323 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2324 TargetType, ExprLoc); 2325 2326 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2327 SourceRange(ExprLoc, ExprLoc), 2328 E->getSourceRange()).take(); 2329} 2330 2331/// ImplicitInitializerKind - How an implicit base or member initializer should 2332/// initialize its base or member. 2333enum ImplicitInitializerKind { 2334 IIK_Default, 2335 IIK_Copy, 2336 IIK_Move 2337}; 2338 2339static bool 2340BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2341 ImplicitInitializerKind ImplicitInitKind, 2342 CXXBaseSpecifier *BaseSpec, 2343 bool IsInheritedVirtualBase, 2344 CXXCtorInitializer *&CXXBaseInit) { 2345 InitializedEntity InitEntity 2346 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2347 IsInheritedVirtualBase); 2348 2349 ExprResult BaseInit; 2350 2351 switch (ImplicitInitKind) { 2352 case IIK_Default: { 2353 InitializationKind InitKind 2354 = InitializationKind::CreateDefault(Constructor->getLocation()); 2355 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2356 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2357 MultiExprArg(SemaRef, 0, 0)); 2358 break; 2359 } 2360 2361 case IIK_Move: 2362 case IIK_Copy: { 2363 bool Moving = ImplicitInitKind == IIK_Move; 2364 ParmVarDecl *Param = Constructor->getParamDecl(0); 2365 QualType ParamType = Param->getType().getNonReferenceType(); 2366 2367 Expr *CopyCtorArg = 2368 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2369 Constructor->getLocation(), ParamType, 2370 VK_LValue, 0); 2371 2372 // Cast to the base class to avoid ambiguities. 2373 QualType ArgTy = 2374 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2375 ParamType.getQualifiers()); 2376 2377 if (Moving) { 2378 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2379 } 2380 2381 CXXCastPath BasePath; 2382 BasePath.push_back(BaseSpec); 2383 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2384 CK_UncheckedDerivedToBase, 2385 Moving ? VK_XValue : VK_LValue, 2386 &BasePath).take(); 2387 2388 InitializationKind InitKind 2389 = InitializationKind::CreateDirect(Constructor->getLocation(), 2390 SourceLocation(), SourceLocation()); 2391 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2392 &CopyCtorArg, 1); 2393 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2394 MultiExprArg(&CopyCtorArg, 1)); 2395 break; 2396 } 2397 } 2398 2399 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2400 if (BaseInit.isInvalid()) 2401 return true; 2402 2403 CXXBaseInit = 2404 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2405 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2406 SourceLocation()), 2407 BaseSpec->isVirtual(), 2408 SourceLocation(), 2409 BaseInit.takeAs<Expr>(), 2410 SourceLocation(), 2411 SourceLocation()); 2412 2413 return false; 2414} 2415 2416static bool RefersToRValueRef(Expr *MemRef) { 2417 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2418 return Referenced->getType()->isRValueReferenceType(); 2419} 2420 2421static bool 2422BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2423 ImplicitInitializerKind ImplicitInitKind, 2424 FieldDecl *Field, IndirectFieldDecl *Indirect, 2425 CXXCtorInitializer *&CXXMemberInit) { 2426 if (Field->isInvalidDecl()) 2427 return true; 2428 2429 SourceLocation Loc = Constructor->getLocation(); 2430 2431 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2432 bool Moving = ImplicitInitKind == IIK_Move; 2433 ParmVarDecl *Param = Constructor->getParamDecl(0); 2434 QualType ParamType = Param->getType().getNonReferenceType(); 2435 2436 // Suppress copying zero-width bitfields. 2437 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2438 return false; 2439 2440 Expr *MemberExprBase = 2441 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2442 Loc, ParamType, VK_LValue, 0); 2443 2444 if (Moving) { 2445 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2446 } 2447 2448 // Build a reference to this field within the parameter. 2449 CXXScopeSpec SS; 2450 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2451 Sema::LookupMemberName); 2452 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2453 : cast<ValueDecl>(Field), AS_public); 2454 MemberLookup.resolveKind(); 2455 ExprResult CtorArg 2456 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2457 ParamType, Loc, 2458 /*IsArrow=*/false, 2459 SS, 2460 /*FirstQualifierInScope=*/0, 2461 MemberLookup, 2462 /*TemplateArgs=*/0); 2463 if (CtorArg.isInvalid()) 2464 return true; 2465 2466 // C++11 [class.copy]p15: 2467 // - if a member m has rvalue reference type T&&, it is direct-initialized 2468 // with static_cast<T&&>(x.m); 2469 if (RefersToRValueRef(CtorArg.get())) { 2470 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2471 } 2472 2473 // When the field we are copying is an array, create index variables for 2474 // each dimension of the array. We use these index variables to subscript 2475 // the source array, and other clients (e.g., CodeGen) will perform the 2476 // necessary iteration with these index variables. 2477 SmallVector<VarDecl *, 4> IndexVariables; 2478 QualType BaseType = Field->getType(); 2479 QualType SizeType = SemaRef.Context.getSizeType(); 2480 bool InitializingArray = false; 2481 while (const ConstantArrayType *Array 2482 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2483 InitializingArray = true; 2484 // Create the iteration variable for this array index. 2485 IdentifierInfo *IterationVarName = 0; 2486 { 2487 llvm::SmallString<8> Str; 2488 llvm::raw_svector_ostream OS(Str); 2489 OS << "__i" << IndexVariables.size(); 2490 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2491 } 2492 VarDecl *IterationVar 2493 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2494 IterationVarName, SizeType, 2495 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2496 SC_None, SC_None); 2497 IndexVariables.push_back(IterationVar); 2498 2499 // Create a reference to the iteration variable. 2500 ExprResult IterationVarRef 2501 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2502 assert(!IterationVarRef.isInvalid() && 2503 "Reference to invented variable cannot fail!"); 2504 2505 // Subscript the array with this iteration variable. 2506 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2507 IterationVarRef.take(), 2508 Loc); 2509 if (CtorArg.isInvalid()) 2510 return true; 2511 2512 BaseType = Array->getElementType(); 2513 } 2514 2515 // The array subscript expression is an lvalue, which is wrong for moving. 2516 if (Moving && InitializingArray) 2517 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2518 2519 // Construct the entity that we will be initializing. For an array, this 2520 // will be first element in the array, which may require several levels 2521 // of array-subscript entities. 2522 SmallVector<InitializedEntity, 4> Entities; 2523 Entities.reserve(1 + IndexVariables.size()); 2524 if (Indirect) 2525 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2526 else 2527 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2528 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2529 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2530 0, 2531 Entities.back())); 2532 2533 // Direct-initialize to use the copy constructor. 2534 InitializationKind InitKind = 2535 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2536 2537 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2538 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2539 &CtorArgE, 1); 2540 2541 ExprResult MemberInit 2542 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2543 MultiExprArg(&CtorArgE, 1)); 2544 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2545 if (MemberInit.isInvalid()) 2546 return true; 2547 2548 if (Indirect) { 2549 assert(IndexVariables.size() == 0 && 2550 "Indirect field improperly initialized"); 2551 CXXMemberInit 2552 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2553 Loc, Loc, 2554 MemberInit.takeAs<Expr>(), 2555 Loc); 2556 } else 2557 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2558 Loc, MemberInit.takeAs<Expr>(), 2559 Loc, 2560 IndexVariables.data(), 2561 IndexVariables.size()); 2562 return false; 2563 } 2564 2565 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2566 2567 QualType FieldBaseElementType = 2568 SemaRef.Context.getBaseElementType(Field->getType()); 2569 2570 if (FieldBaseElementType->isRecordType()) { 2571 InitializedEntity InitEntity 2572 = Indirect? InitializedEntity::InitializeMember(Indirect) 2573 : InitializedEntity::InitializeMember(Field); 2574 InitializationKind InitKind = 2575 InitializationKind::CreateDefault(Loc); 2576 2577 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2578 ExprResult MemberInit = 2579 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2580 2581 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2582 if (MemberInit.isInvalid()) 2583 return true; 2584 2585 if (Indirect) 2586 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2587 Indirect, Loc, 2588 Loc, 2589 MemberInit.get(), 2590 Loc); 2591 else 2592 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2593 Field, Loc, Loc, 2594 MemberInit.get(), 2595 Loc); 2596 return false; 2597 } 2598 2599 if (!Field->getParent()->isUnion()) { 2600 if (FieldBaseElementType->isReferenceType()) { 2601 SemaRef.Diag(Constructor->getLocation(), 2602 diag::err_uninitialized_member_in_ctor) 2603 << (int)Constructor->isImplicit() 2604 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2605 << 0 << Field->getDeclName(); 2606 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2607 return true; 2608 } 2609 2610 if (FieldBaseElementType.isConstQualified()) { 2611 SemaRef.Diag(Constructor->getLocation(), 2612 diag::err_uninitialized_member_in_ctor) 2613 << (int)Constructor->isImplicit() 2614 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2615 << 1 << Field->getDeclName(); 2616 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2617 return true; 2618 } 2619 } 2620 2621 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2622 FieldBaseElementType->isObjCRetainableType() && 2623 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2624 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2625 // Instant objects: 2626 // Default-initialize Objective-C pointers to NULL. 2627 CXXMemberInit 2628 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2629 Loc, Loc, 2630 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2631 Loc); 2632 return false; 2633 } 2634 2635 // Nothing to initialize. 2636 CXXMemberInit = 0; 2637 return false; 2638} 2639 2640namespace { 2641struct BaseAndFieldInfo { 2642 Sema &S; 2643 CXXConstructorDecl *Ctor; 2644 bool AnyErrorsInInits; 2645 ImplicitInitializerKind IIK; 2646 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2647 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2648 2649 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2650 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2651 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2652 if (Generated && Ctor->isCopyConstructor()) 2653 IIK = IIK_Copy; 2654 else if (Generated && Ctor->isMoveConstructor()) 2655 IIK = IIK_Move; 2656 else 2657 IIK = IIK_Default; 2658 } 2659 2660 bool isImplicitCopyOrMove() const { 2661 switch (IIK) { 2662 case IIK_Copy: 2663 case IIK_Move: 2664 return true; 2665 2666 case IIK_Default: 2667 return false; 2668 } 2669 2670 return false; 2671 } 2672}; 2673} 2674 2675/// \brief Determine whether the given indirect field declaration is somewhere 2676/// within an anonymous union. 2677static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2678 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2679 CEnd = F->chain_end(); 2680 C != CEnd; ++C) 2681 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2682 if (Record->isUnion()) 2683 return true; 2684 2685 return false; 2686} 2687 2688/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2689/// array type. 2690static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2691 if (T->isIncompleteArrayType()) 2692 return true; 2693 2694 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2695 if (!ArrayT->getSize()) 2696 return true; 2697 2698 T = ArrayT->getElementType(); 2699 } 2700 2701 return false; 2702} 2703 2704static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2705 FieldDecl *Field, 2706 IndirectFieldDecl *Indirect = 0) { 2707 2708 // Overwhelmingly common case: we have a direct initializer for this field. 2709 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2710 Info.AllToInit.push_back(Init); 2711 return false; 2712 } 2713 2714 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2715 // has a brace-or-equal-initializer, the entity is initialized as specified 2716 // in [dcl.init]. 2717 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2718 CXXCtorInitializer *Init; 2719 if (Indirect) 2720 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2721 SourceLocation(), 2722 SourceLocation(), 0, 2723 SourceLocation()); 2724 else 2725 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2726 SourceLocation(), 2727 SourceLocation(), 0, 2728 SourceLocation()); 2729 Info.AllToInit.push_back(Init); 2730 return false; 2731 } 2732 2733 // Don't build an implicit initializer for union members if none was 2734 // explicitly specified. 2735 if (Field->getParent()->isUnion() || 2736 (Indirect && isWithinAnonymousUnion(Indirect))) 2737 return false; 2738 2739 // Don't initialize incomplete or zero-length arrays. 2740 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2741 return false; 2742 2743 // Don't try to build an implicit initializer if there were semantic 2744 // errors in any of the initializers (and therefore we might be 2745 // missing some that the user actually wrote). 2746 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2747 return false; 2748 2749 CXXCtorInitializer *Init = 0; 2750 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2751 Indirect, Init)) 2752 return true; 2753 2754 if (Init) 2755 Info.AllToInit.push_back(Init); 2756 2757 return false; 2758} 2759 2760bool 2761Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2762 CXXCtorInitializer *Initializer) { 2763 assert(Initializer->isDelegatingInitializer()); 2764 Constructor->setNumCtorInitializers(1); 2765 CXXCtorInitializer **initializer = 2766 new (Context) CXXCtorInitializer*[1]; 2767 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2768 Constructor->setCtorInitializers(initializer); 2769 2770 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2771 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2772 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2773 } 2774 2775 DelegatingCtorDecls.push_back(Constructor); 2776 2777 return false; 2778} 2779 2780bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2781 CXXCtorInitializer **Initializers, 2782 unsigned NumInitializers, 2783 bool AnyErrors) { 2784 if (Constructor->isDependentContext()) { 2785 // Just store the initializers as written, they will be checked during 2786 // instantiation. 2787 if (NumInitializers > 0) { 2788 Constructor->setNumCtorInitializers(NumInitializers); 2789 CXXCtorInitializer **baseOrMemberInitializers = 2790 new (Context) CXXCtorInitializer*[NumInitializers]; 2791 memcpy(baseOrMemberInitializers, Initializers, 2792 NumInitializers * sizeof(CXXCtorInitializer*)); 2793 Constructor->setCtorInitializers(baseOrMemberInitializers); 2794 } 2795 2796 return false; 2797 } 2798 2799 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2800 2801 // We need to build the initializer AST according to order of construction 2802 // and not what user specified in the Initializers list. 2803 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2804 if (!ClassDecl) 2805 return true; 2806 2807 bool HadError = false; 2808 2809 for (unsigned i = 0; i < NumInitializers; i++) { 2810 CXXCtorInitializer *Member = Initializers[i]; 2811 2812 if (Member->isBaseInitializer()) 2813 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2814 else 2815 Info.AllBaseFields[Member->getAnyMember()] = Member; 2816 } 2817 2818 // Keep track of the direct virtual bases. 2819 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2820 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2821 E = ClassDecl->bases_end(); I != E; ++I) { 2822 if (I->isVirtual()) 2823 DirectVBases.insert(I); 2824 } 2825 2826 // Push virtual bases before others. 2827 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2828 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2829 2830 if (CXXCtorInitializer *Value 2831 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2832 Info.AllToInit.push_back(Value); 2833 } else if (!AnyErrors) { 2834 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2835 CXXCtorInitializer *CXXBaseInit; 2836 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2837 VBase, IsInheritedVirtualBase, 2838 CXXBaseInit)) { 2839 HadError = true; 2840 continue; 2841 } 2842 2843 Info.AllToInit.push_back(CXXBaseInit); 2844 } 2845 } 2846 2847 // Non-virtual bases. 2848 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2849 E = ClassDecl->bases_end(); Base != E; ++Base) { 2850 // Virtuals are in the virtual base list and already constructed. 2851 if (Base->isVirtual()) 2852 continue; 2853 2854 if (CXXCtorInitializer *Value 2855 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2856 Info.AllToInit.push_back(Value); 2857 } else if (!AnyErrors) { 2858 CXXCtorInitializer *CXXBaseInit; 2859 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2860 Base, /*IsInheritedVirtualBase=*/false, 2861 CXXBaseInit)) { 2862 HadError = true; 2863 continue; 2864 } 2865 2866 Info.AllToInit.push_back(CXXBaseInit); 2867 } 2868 } 2869 2870 // Fields. 2871 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2872 MemEnd = ClassDecl->decls_end(); 2873 Mem != MemEnd; ++Mem) { 2874 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2875 // C++ [class.bit]p2: 2876 // A declaration for a bit-field that omits the identifier declares an 2877 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2878 // initialized. 2879 if (F->isUnnamedBitfield()) 2880 continue; 2881 2882 // If we're not generating the implicit copy/move constructor, then we'll 2883 // handle anonymous struct/union fields based on their individual 2884 // indirect fields. 2885 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2886 continue; 2887 2888 if (CollectFieldInitializer(*this, Info, F)) 2889 HadError = true; 2890 continue; 2891 } 2892 2893 // Beyond this point, we only consider default initialization. 2894 if (Info.IIK != IIK_Default) 2895 continue; 2896 2897 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2898 if (F->getType()->isIncompleteArrayType()) { 2899 assert(ClassDecl->hasFlexibleArrayMember() && 2900 "Incomplete array type is not valid"); 2901 continue; 2902 } 2903 2904 // Initialize each field of an anonymous struct individually. 2905 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2906 HadError = true; 2907 2908 continue; 2909 } 2910 } 2911 2912 NumInitializers = Info.AllToInit.size(); 2913 if (NumInitializers > 0) { 2914 Constructor->setNumCtorInitializers(NumInitializers); 2915 CXXCtorInitializer **baseOrMemberInitializers = 2916 new (Context) CXXCtorInitializer*[NumInitializers]; 2917 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2918 NumInitializers * sizeof(CXXCtorInitializer*)); 2919 Constructor->setCtorInitializers(baseOrMemberInitializers); 2920 2921 // Constructors implicitly reference the base and member 2922 // destructors. 2923 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2924 Constructor->getParent()); 2925 } 2926 2927 return HadError; 2928} 2929 2930static void *GetKeyForTopLevelField(FieldDecl *Field) { 2931 // For anonymous unions, use the class declaration as the key. 2932 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2933 if (RT->getDecl()->isAnonymousStructOrUnion()) 2934 return static_cast<void *>(RT->getDecl()); 2935 } 2936 return static_cast<void *>(Field); 2937} 2938 2939static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2940 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2941} 2942 2943static void *GetKeyForMember(ASTContext &Context, 2944 CXXCtorInitializer *Member) { 2945 if (!Member->isAnyMemberInitializer()) 2946 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2947 2948 // For fields injected into the class via declaration of an anonymous union, 2949 // use its anonymous union class declaration as the unique key. 2950 FieldDecl *Field = Member->getAnyMember(); 2951 2952 // If the field is a member of an anonymous struct or union, our key 2953 // is the anonymous record decl that's a direct child of the class. 2954 RecordDecl *RD = Field->getParent(); 2955 if (RD->isAnonymousStructOrUnion()) { 2956 while (true) { 2957 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2958 if (Parent->isAnonymousStructOrUnion()) 2959 RD = Parent; 2960 else 2961 break; 2962 } 2963 2964 return static_cast<void *>(RD); 2965 } 2966 2967 return static_cast<void *>(Field); 2968} 2969 2970static void 2971DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2972 const CXXConstructorDecl *Constructor, 2973 CXXCtorInitializer **Inits, 2974 unsigned NumInits) { 2975 if (Constructor->getDeclContext()->isDependentContext()) 2976 return; 2977 2978 // Don't check initializers order unless the warning is enabled at the 2979 // location of at least one initializer. 2980 bool ShouldCheckOrder = false; 2981 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2982 CXXCtorInitializer *Init = Inits[InitIndex]; 2983 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2984 Init->getSourceLocation()) 2985 != DiagnosticsEngine::Ignored) { 2986 ShouldCheckOrder = true; 2987 break; 2988 } 2989 } 2990 if (!ShouldCheckOrder) 2991 return; 2992 2993 // Build the list of bases and members in the order that they'll 2994 // actually be initialized. The explicit initializers should be in 2995 // this same order but may be missing things. 2996 SmallVector<const void*, 32> IdealInitKeys; 2997 2998 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2999 3000 // 1. Virtual bases. 3001 for (CXXRecordDecl::base_class_const_iterator VBase = 3002 ClassDecl->vbases_begin(), 3003 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3004 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3005 3006 // 2. Non-virtual bases. 3007 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3008 E = ClassDecl->bases_end(); Base != E; ++Base) { 3009 if (Base->isVirtual()) 3010 continue; 3011 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3012 } 3013 3014 // 3. Direct fields. 3015 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3016 E = ClassDecl->field_end(); Field != E; ++Field) { 3017 if (Field->isUnnamedBitfield()) 3018 continue; 3019 3020 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3021 } 3022 3023 unsigned NumIdealInits = IdealInitKeys.size(); 3024 unsigned IdealIndex = 0; 3025 3026 CXXCtorInitializer *PrevInit = 0; 3027 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3028 CXXCtorInitializer *Init = Inits[InitIndex]; 3029 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3030 3031 // Scan forward to try to find this initializer in the idealized 3032 // initializers list. 3033 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3034 if (InitKey == IdealInitKeys[IdealIndex]) 3035 break; 3036 3037 // If we didn't find this initializer, it must be because we 3038 // scanned past it on a previous iteration. That can only 3039 // happen if we're out of order; emit a warning. 3040 if (IdealIndex == NumIdealInits && PrevInit) { 3041 Sema::SemaDiagnosticBuilder D = 3042 SemaRef.Diag(PrevInit->getSourceLocation(), 3043 diag::warn_initializer_out_of_order); 3044 3045 if (PrevInit->isAnyMemberInitializer()) 3046 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3047 else 3048 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3049 3050 if (Init->isAnyMemberInitializer()) 3051 D << 0 << Init->getAnyMember()->getDeclName(); 3052 else 3053 D << 1 << Init->getTypeSourceInfo()->getType(); 3054 3055 // Move back to the initializer's location in the ideal list. 3056 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3057 if (InitKey == IdealInitKeys[IdealIndex]) 3058 break; 3059 3060 assert(IdealIndex != NumIdealInits && 3061 "initializer not found in initializer list"); 3062 } 3063 3064 PrevInit = Init; 3065 } 3066} 3067 3068namespace { 3069bool CheckRedundantInit(Sema &S, 3070 CXXCtorInitializer *Init, 3071 CXXCtorInitializer *&PrevInit) { 3072 if (!PrevInit) { 3073 PrevInit = Init; 3074 return false; 3075 } 3076 3077 if (FieldDecl *Field = Init->getMember()) 3078 S.Diag(Init->getSourceLocation(), 3079 diag::err_multiple_mem_initialization) 3080 << Field->getDeclName() 3081 << Init->getSourceRange(); 3082 else { 3083 const Type *BaseClass = Init->getBaseClass(); 3084 assert(BaseClass && "neither field nor base"); 3085 S.Diag(Init->getSourceLocation(), 3086 diag::err_multiple_base_initialization) 3087 << QualType(BaseClass, 0) 3088 << Init->getSourceRange(); 3089 } 3090 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3091 << 0 << PrevInit->getSourceRange(); 3092 3093 return true; 3094} 3095 3096typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3097typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3098 3099bool CheckRedundantUnionInit(Sema &S, 3100 CXXCtorInitializer *Init, 3101 RedundantUnionMap &Unions) { 3102 FieldDecl *Field = Init->getAnyMember(); 3103 RecordDecl *Parent = Field->getParent(); 3104 NamedDecl *Child = Field; 3105 3106 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3107 if (Parent->isUnion()) { 3108 UnionEntry &En = Unions[Parent]; 3109 if (En.first && En.first != Child) { 3110 S.Diag(Init->getSourceLocation(), 3111 diag::err_multiple_mem_union_initialization) 3112 << Field->getDeclName() 3113 << Init->getSourceRange(); 3114 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3115 << 0 << En.second->getSourceRange(); 3116 return true; 3117 } 3118 if (!En.first) { 3119 En.first = Child; 3120 En.second = Init; 3121 } 3122 if (!Parent->isAnonymousStructOrUnion()) 3123 return false; 3124 } 3125 3126 Child = Parent; 3127 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3128 } 3129 3130 return false; 3131} 3132} 3133 3134/// ActOnMemInitializers - Handle the member initializers for a constructor. 3135void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3136 SourceLocation ColonLoc, 3137 CXXCtorInitializer **meminits, 3138 unsigned NumMemInits, 3139 bool AnyErrors) { 3140 if (!ConstructorDecl) 3141 return; 3142 3143 AdjustDeclIfTemplate(ConstructorDecl); 3144 3145 CXXConstructorDecl *Constructor 3146 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3147 3148 if (!Constructor) { 3149 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3150 return; 3151 } 3152 3153 CXXCtorInitializer **MemInits = 3154 reinterpret_cast<CXXCtorInitializer **>(meminits); 3155 3156 // Mapping for the duplicate initializers check. 3157 // For member initializers, this is keyed with a FieldDecl*. 3158 // For base initializers, this is keyed with a Type*. 3159 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3160 3161 // Mapping for the inconsistent anonymous-union initializers check. 3162 RedundantUnionMap MemberUnions; 3163 3164 bool HadError = false; 3165 for (unsigned i = 0; i < NumMemInits; i++) { 3166 CXXCtorInitializer *Init = MemInits[i]; 3167 3168 // Set the source order index. 3169 Init->setSourceOrder(i); 3170 3171 if (Init->isAnyMemberInitializer()) { 3172 FieldDecl *Field = Init->getAnyMember(); 3173 if (CheckRedundantInit(*this, Init, Members[Field]) || 3174 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3175 HadError = true; 3176 } else if (Init->isBaseInitializer()) { 3177 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3178 if (CheckRedundantInit(*this, Init, Members[Key])) 3179 HadError = true; 3180 } else { 3181 assert(Init->isDelegatingInitializer()); 3182 // This must be the only initializer 3183 if (i != 0 || NumMemInits > 1) { 3184 Diag(MemInits[0]->getSourceLocation(), 3185 diag::err_delegating_initializer_alone) 3186 << MemInits[0]->getSourceRange(); 3187 HadError = true; 3188 // We will treat this as being the only initializer. 3189 } 3190 SetDelegatingInitializer(Constructor, MemInits[i]); 3191 // Return immediately as the initializer is set. 3192 return; 3193 } 3194 } 3195 3196 if (HadError) 3197 return; 3198 3199 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3200 3201 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3202} 3203 3204void 3205Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3206 CXXRecordDecl *ClassDecl) { 3207 // Ignore dependent contexts. Also ignore unions, since their members never 3208 // have destructors implicitly called. 3209 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3210 return; 3211 3212 // FIXME: all the access-control diagnostics are positioned on the 3213 // field/base declaration. That's probably good; that said, the 3214 // user might reasonably want to know why the destructor is being 3215 // emitted, and we currently don't say. 3216 3217 // Non-static data members. 3218 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3219 E = ClassDecl->field_end(); I != E; ++I) { 3220 FieldDecl *Field = *I; 3221 if (Field->isInvalidDecl()) 3222 continue; 3223 3224 // Don't destroy incomplete or zero-length arrays. 3225 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3226 continue; 3227 3228 QualType FieldType = Context.getBaseElementType(Field->getType()); 3229 3230 const RecordType* RT = FieldType->getAs<RecordType>(); 3231 if (!RT) 3232 continue; 3233 3234 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3235 if (FieldClassDecl->isInvalidDecl()) 3236 continue; 3237 if (FieldClassDecl->hasTrivialDestructor()) 3238 continue; 3239 3240 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3241 assert(Dtor && "No dtor found for FieldClassDecl!"); 3242 CheckDestructorAccess(Field->getLocation(), Dtor, 3243 PDiag(diag::err_access_dtor_field) 3244 << Field->getDeclName() 3245 << FieldType); 3246 3247 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3248 } 3249 3250 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3251 3252 // Bases. 3253 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3254 E = ClassDecl->bases_end(); Base != E; ++Base) { 3255 // Bases are always records in a well-formed non-dependent class. 3256 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3257 3258 // Remember direct virtual bases. 3259 if (Base->isVirtual()) 3260 DirectVirtualBases.insert(RT); 3261 3262 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3263 // If our base class is invalid, we probably can't get its dtor anyway. 3264 if (BaseClassDecl->isInvalidDecl()) 3265 continue; 3266 // Ignore trivial destructors. 3267 if (BaseClassDecl->hasTrivialDestructor()) 3268 continue; 3269 3270 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3271 assert(Dtor && "No dtor found for BaseClassDecl!"); 3272 3273 // FIXME: caret should be on the start of the class name 3274 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3275 PDiag(diag::err_access_dtor_base) 3276 << Base->getType() 3277 << Base->getSourceRange()); 3278 3279 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3280 } 3281 3282 // Virtual bases. 3283 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3284 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3285 3286 // Bases are always records in a well-formed non-dependent class. 3287 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3288 3289 // Ignore direct virtual bases. 3290 if (DirectVirtualBases.count(RT)) 3291 continue; 3292 3293 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3294 // If our base class is invalid, we probably can't get its dtor anyway. 3295 if (BaseClassDecl->isInvalidDecl()) 3296 continue; 3297 // Ignore trivial destructors. 3298 if (BaseClassDecl->hasTrivialDestructor()) 3299 continue; 3300 3301 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3302 assert(Dtor && "No dtor found for BaseClassDecl!"); 3303 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3304 PDiag(diag::err_access_dtor_vbase) 3305 << VBase->getType()); 3306 3307 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3308 } 3309} 3310 3311void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3312 if (!CDtorDecl) 3313 return; 3314 3315 if (CXXConstructorDecl *Constructor 3316 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3317 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3318} 3319 3320bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3321 unsigned DiagID, AbstractDiagSelID SelID) { 3322 if (SelID == -1) 3323 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3324 else 3325 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3326} 3327 3328bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3329 const PartialDiagnostic &PD) { 3330 if (!getLangOptions().CPlusPlus) 3331 return false; 3332 3333 if (const ArrayType *AT = Context.getAsArrayType(T)) 3334 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3335 3336 if (const PointerType *PT = T->getAs<PointerType>()) { 3337 // Find the innermost pointer type. 3338 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3339 PT = T; 3340 3341 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3342 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3343 } 3344 3345 const RecordType *RT = T->getAs<RecordType>(); 3346 if (!RT) 3347 return false; 3348 3349 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3350 3351 // We can't answer whether something is abstract until it has a 3352 // definition. If it's currently being defined, we'll walk back 3353 // over all the declarations when we have a full definition. 3354 const CXXRecordDecl *Def = RD->getDefinition(); 3355 if (!Def || Def->isBeingDefined()) 3356 return false; 3357 3358 if (!RD->isAbstract()) 3359 return false; 3360 3361 Diag(Loc, PD) << RD->getDeclName(); 3362 DiagnoseAbstractType(RD); 3363 3364 return true; 3365} 3366 3367void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3368 // Check if we've already emitted the list of pure virtual functions 3369 // for this class. 3370 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3371 return; 3372 3373 CXXFinalOverriderMap FinalOverriders; 3374 RD->getFinalOverriders(FinalOverriders); 3375 3376 // Keep a set of seen pure methods so we won't diagnose the same method 3377 // more than once. 3378 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3379 3380 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3381 MEnd = FinalOverriders.end(); 3382 M != MEnd; 3383 ++M) { 3384 for (OverridingMethods::iterator SO = M->second.begin(), 3385 SOEnd = M->second.end(); 3386 SO != SOEnd; ++SO) { 3387 // C++ [class.abstract]p4: 3388 // A class is abstract if it contains or inherits at least one 3389 // pure virtual function for which the final overrider is pure 3390 // virtual. 3391 3392 // 3393 if (SO->second.size() != 1) 3394 continue; 3395 3396 if (!SO->second.front().Method->isPure()) 3397 continue; 3398 3399 if (!SeenPureMethods.insert(SO->second.front().Method)) 3400 continue; 3401 3402 Diag(SO->second.front().Method->getLocation(), 3403 diag::note_pure_virtual_function) 3404 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3405 } 3406 } 3407 3408 if (!PureVirtualClassDiagSet) 3409 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3410 PureVirtualClassDiagSet->insert(RD); 3411} 3412 3413namespace { 3414struct AbstractUsageInfo { 3415 Sema &S; 3416 CXXRecordDecl *Record; 3417 CanQualType AbstractType; 3418 bool Invalid; 3419 3420 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3421 : S(S), Record(Record), 3422 AbstractType(S.Context.getCanonicalType( 3423 S.Context.getTypeDeclType(Record))), 3424 Invalid(false) {} 3425 3426 void DiagnoseAbstractType() { 3427 if (Invalid) return; 3428 S.DiagnoseAbstractType(Record); 3429 Invalid = true; 3430 } 3431 3432 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3433}; 3434 3435struct CheckAbstractUsage { 3436 AbstractUsageInfo &Info; 3437 const NamedDecl *Ctx; 3438 3439 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3440 : Info(Info), Ctx(Ctx) {} 3441 3442 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3443 switch (TL.getTypeLocClass()) { 3444#define ABSTRACT_TYPELOC(CLASS, PARENT) 3445#define TYPELOC(CLASS, PARENT) \ 3446 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3447#include "clang/AST/TypeLocNodes.def" 3448 } 3449 } 3450 3451 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3452 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3453 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3454 if (!TL.getArg(I)) 3455 continue; 3456 3457 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3458 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3459 } 3460 } 3461 3462 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3463 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3464 } 3465 3466 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3467 // Visit the type parameters from a permissive context. 3468 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3469 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3470 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3471 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3472 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3473 // TODO: other template argument types? 3474 } 3475 } 3476 3477 // Visit pointee types from a permissive context. 3478#define CheckPolymorphic(Type) \ 3479 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3480 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3481 } 3482 CheckPolymorphic(PointerTypeLoc) 3483 CheckPolymorphic(ReferenceTypeLoc) 3484 CheckPolymorphic(MemberPointerTypeLoc) 3485 CheckPolymorphic(BlockPointerTypeLoc) 3486 CheckPolymorphic(AtomicTypeLoc) 3487 3488 /// Handle all the types we haven't given a more specific 3489 /// implementation for above. 3490 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3491 // Every other kind of type that we haven't called out already 3492 // that has an inner type is either (1) sugar or (2) contains that 3493 // inner type in some way as a subobject. 3494 if (TypeLoc Next = TL.getNextTypeLoc()) 3495 return Visit(Next, Sel); 3496 3497 // If there's no inner type and we're in a permissive context, 3498 // don't diagnose. 3499 if (Sel == Sema::AbstractNone) return; 3500 3501 // Check whether the type matches the abstract type. 3502 QualType T = TL.getType(); 3503 if (T->isArrayType()) { 3504 Sel = Sema::AbstractArrayType; 3505 T = Info.S.Context.getBaseElementType(T); 3506 } 3507 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3508 if (CT != Info.AbstractType) return; 3509 3510 // It matched; do some magic. 3511 if (Sel == Sema::AbstractArrayType) { 3512 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3513 << T << TL.getSourceRange(); 3514 } else { 3515 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3516 << Sel << T << TL.getSourceRange(); 3517 } 3518 Info.DiagnoseAbstractType(); 3519 } 3520}; 3521 3522void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3523 Sema::AbstractDiagSelID Sel) { 3524 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3525} 3526 3527} 3528 3529/// Check for invalid uses of an abstract type in a method declaration. 3530static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3531 CXXMethodDecl *MD) { 3532 // No need to do the check on definitions, which require that 3533 // the return/param types be complete. 3534 if (MD->doesThisDeclarationHaveABody()) 3535 return; 3536 3537 // For safety's sake, just ignore it if we don't have type source 3538 // information. This should never happen for non-implicit methods, 3539 // but... 3540 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3541 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3542} 3543 3544/// Check for invalid uses of an abstract type within a class definition. 3545static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3546 CXXRecordDecl *RD) { 3547 for (CXXRecordDecl::decl_iterator 3548 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3549 Decl *D = *I; 3550 if (D->isImplicit()) continue; 3551 3552 // Methods and method templates. 3553 if (isa<CXXMethodDecl>(D)) { 3554 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3555 } else if (isa<FunctionTemplateDecl>(D)) { 3556 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3557 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3558 3559 // Fields and static variables. 3560 } else if (isa<FieldDecl>(D)) { 3561 FieldDecl *FD = cast<FieldDecl>(D); 3562 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3563 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3564 } else if (isa<VarDecl>(D)) { 3565 VarDecl *VD = cast<VarDecl>(D); 3566 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3567 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3568 3569 // Nested classes and class templates. 3570 } else if (isa<CXXRecordDecl>(D)) { 3571 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3572 } else if (isa<ClassTemplateDecl>(D)) { 3573 CheckAbstractClassUsage(Info, 3574 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3575 } 3576 } 3577} 3578 3579/// \brief Perform semantic checks on a class definition that has been 3580/// completing, introducing implicitly-declared members, checking for 3581/// abstract types, etc. 3582void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3583 if (!Record) 3584 return; 3585 3586 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3587 AbstractUsageInfo Info(*this, Record); 3588 CheckAbstractClassUsage(Info, Record); 3589 } 3590 3591 // If this is not an aggregate type and has no user-declared constructor, 3592 // complain about any non-static data members of reference or const scalar 3593 // type, since they will never get initializers. 3594 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3595 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3596 bool Complained = false; 3597 for (RecordDecl::field_iterator F = Record->field_begin(), 3598 FEnd = Record->field_end(); 3599 F != FEnd; ++F) { 3600 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3601 continue; 3602 3603 if (F->getType()->isReferenceType() || 3604 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3605 if (!Complained) { 3606 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3607 << Record->getTagKind() << Record; 3608 Complained = true; 3609 } 3610 3611 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3612 << F->getType()->isReferenceType() 3613 << F->getDeclName(); 3614 } 3615 } 3616 } 3617 3618 if (Record->isDynamicClass() && !Record->isDependentType()) 3619 DynamicClasses.push_back(Record); 3620 3621 if (Record->getIdentifier()) { 3622 // C++ [class.mem]p13: 3623 // If T is the name of a class, then each of the following shall have a 3624 // name different from T: 3625 // - every member of every anonymous union that is a member of class T. 3626 // 3627 // C++ [class.mem]p14: 3628 // In addition, if class T has a user-declared constructor (12.1), every 3629 // non-static data member of class T shall have a name different from T. 3630 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3631 R.first != R.second; ++R.first) { 3632 NamedDecl *D = *R.first; 3633 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3634 isa<IndirectFieldDecl>(D)) { 3635 Diag(D->getLocation(), diag::err_member_name_of_class) 3636 << D->getDeclName(); 3637 break; 3638 } 3639 } 3640 } 3641 3642 // Warn if the class has virtual methods but non-virtual public destructor. 3643 if (Record->isPolymorphic() && !Record->isDependentType()) { 3644 CXXDestructorDecl *dtor = Record->getDestructor(); 3645 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3646 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3647 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3648 } 3649 3650 // See if a method overloads virtual methods in a base 3651 /// class without overriding any. 3652 if (!Record->isDependentType()) { 3653 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3654 MEnd = Record->method_end(); 3655 M != MEnd; ++M) { 3656 if (!(*M)->isStatic()) 3657 DiagnoseHiddenVirtualMethods(Record, *M); 3658 } 3659 } 3660 3661 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3662 // function that is not a constructor declares that member function to be 3663 // const. [...] The class of which that function is a member shall be 3664 // a literal type. 3665 // 3666 // It's fine to diagnose constructors here too: such constructors cannot 3667 // produce a constant expression, so are ill-formed (no diagnostic required). 3668 // 3669 // If the class has virtual bases, any constexpr members will already have 3670 // been diagnosed by the checks performed on the member declaration, so 3671 // suppress this (less useful) diagnostic. 3672 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3673 !Record->isLiteral() && !Record->getNumVBases()) { 3674 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3675 MEnd = Record->method_end(); 3676 M != MEnd; ++M) { 3677 if ((*M)->isConstexpr()) { 3678 switch (Record->getTemplateSpecializationKind()) { 3679 case TSK_ImplicitInstantiation: 3680 case TSK_ExplicitInstantiationDeclaration: 3681 case TSK_ExplicitInstantiationDefinition: 3682 // If a template instantiates to a non-literal type, but its members 3683 // instantiate to constexpr functions, the template is technically 3684 // ill-formed, but we allow it for sanity. Such members are treated as 3685 // non-constexpr. 3686 (*M)->setConstexpr(false); 3687 continue; 3688 3689 case TSK_Undeclared: 3690 case TSK_ExplicitSpecialization: 3691 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3692 PDiag(diag::err_constexpr_method_non_literal)); 3693 break; 3694 } 3695 3696 // Only produce one error per class. 3697 break; 3698 } 3699 } 3700 } 3701 3702 // Declare inherited constructors. We do this eagerly here because: 3703 // - The standard requires an eager diagnostic for conflicting inherited 3704 // constructors from different classes. 3705 // - The lazy declaration of the other implicit constructors is so as to not 3706 // waste space and performance on classes that are not meant to be 3707 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3708 // have inherited constructors. 3709 DeclareInheritedConstructors(Record); 3710 3711 if (!Record->isDependentType()) 3712 CheckExplicitlyDefaultedMethods(Record); 3713} 3714 3715void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3716 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3717 ME = Record->method_end(); 3718 MI != ME; ++MI) { 3719 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3720 switch (getSpecialMember(*MI)) { 3721 case CXXDefaultConstructor: 3722 CheckExplicitlyDefaultedDefaultConstructor( 3723 cast<CXXConstructorDecl>(*MI)); 3724 break; 3725 3726 case CXXDestructor: 3727 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3728 break; 3729 3730 case CXXCopyConstructor: 3731 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3732 break; 3733 3734 case CXXCopyAssignment: 3735 CheckExplicitlyDefaultedCopyAssignment(*MI); 3736 break; 3737 3738 case CXXMoveConstructor: 3739 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3740 break; 3741 3742 case CXXMoveAssignment: 3743 CheckExplicitlyDefaultedMoveAssignment(*MI); 3744 break; 3745 3746 case CXXInvalid: 3747 llvm_unreachable("non-special member explicitly defaulted!"); 3748 } 3749 } 3750 } 3751 3752} 3753 3754void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3755 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3756 3757 // Whether this was the first-declared instance of the constructor. 3758 // This affects whether we implicitly add an exception spec (and, eventually, 3759 // constexpr). It is also ill-formed to explicitly default a constructor such 3760 // that it would be deleted. (C++0x [decl.fct.def.default]) 3761 bool First = CD == CD->getCanonicalDecl(); 3762 3763 bool HadError = false; 3764 if (CD->getNumParams() != 0) { 3765 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3766 << CD->getSourceRange(); 3767 HadError = true; 3768 } 3769 3770 ImplicitExceptionSpecification Spec 3771 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3772 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3773 if (EPI.ExceptionSpecType == EST_Delayed) { 3774 // Exception specification depends on some deferred part of the class. We'll 3775 // try again when the class's definition has been fully processed. 3776 return; 3777 } 3778 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3779 *ExceptionType = Context.getFunctionType( 3780 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3781 3782 // C++11 [dcl.fct.def.default]p2: 3783 // An explicitly-defaulted function may be declared constexpr only if it 3784 // would have been implicitly declared as constexpr, 3785 if (CD->isConstexpr()) { 3786 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3787 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3788 << CXXDefaultConstructor; 3789 HadError = true; 3790 } 3791 } 3792 // and may have an explicit exception-specification only if it is compatible 3793 // with the exception-specification on the implicit declaration. 3794 if (CtorType->hasExceptionSpec()) { 3795 if (CheckEquivalentExceptionSpec( 3796 PDiag(diag::err_incorrect_defaulted_exception_spec) 3797 << CXXDefaultConstructor, 3798 PDiag(), 3799 ExceptionType, SourceLocation(), 3800 CtorType, CD->getLocation())) { 3801 HadError = true; 3802 } 3803 } 3804 3805 // If a function is explicitly defaulted on its first declaration, 3806 if (First) { 3807 // -- it is implicitly considered to be constexpr if the implicit 3808 // definition would be, 3809 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3810 3811 // -- it is implicitly considered to have the same 3812 // exception-specification as if it had been implicitly declared 3813 // 3814 // FIXME: a compatible, but different, explicit exception specification 3815 // will be silently overridden. We should issue a warning if this happens. 3816 EPI.ExtInfo = CtorType->getExtInfo(); 3817 } 3818 3819 if (HadError) { 3820 CD->setInvalidDecl(); 3821 return; 3822 } 3823 3824 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3825 if (First) { 3826 CD->setDeletedAsWritten(); 3827 } else { 3828 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3829 << CXXDefaultConstructor; 3830 CD->setInvalidDecl(); 3831 } 3832 } 3833} 3834 3835void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3836 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3837 3838 // Whether this was the first-declared instance of the constructor. 3839 bool First = CD == CD->getCanonicalDecl(); 3840 3841 bool HadError = false; 3842 if (CD->getNumParams() != 1) { 3843 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3844 << CD->getSourceRange(); 3845 HadError = true; 3846 } 3847 3848 ImplicitExceptionSpecification Spec(Context); 3849 bool Const; 3850 llvm::tie(Spec, Const) = 3851 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3852 3853 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3854 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3855 *ExceptionType = Context.getFunctionType( 3856 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3857 3858 // Check for parameter type matching. 3859 // This is a copy ctor so we know it's a cv-qualified reference to T. 3860 QualType ArgType = CtorType->getArgType(0); 3861 if (ArgType->getPointeeType().isVolatileQualified()) { 3862 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3863 HadError = true; 3864 } 3865 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3866 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3867 HadError = true; 3868 } 3869 3870 // C++11 [dcl.fct.def.default]p2: 3871 // An explicitly-defaulted function may be declared constexpr only if it 3872 // would have been implicitly declared as constexpr, 3873 if (CD->isConstexpr()) { 3874 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3875 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3876 << CXXCopyConstructor; 3877 HadError = true; 3878 } 3879 } 3880 // and may have an explicit exception-specification only if it is compatible 3881 // with the exception-specification on the implicit declaration. 3882 if (CtorType->hasExceptionSpec()) { 3883 if (CheckEquivalentExceptionSpec( 3884 PDiag(diag::err_incorrect_defaulted_exception_spec) 3885 << CXXCopyConstructor, 3886 PDiag(), 3887 ExceptionType, SourceLocation(), 3888 CtorType, CD->getLocation())) { 3889 HadError = true; 3890 } 3891 } 3892 3893 // If a function is explicitly defaulted on its first declaration, 3894 if (First) { 3895 // -- it is implicitly considered to be constexpr if the implicit 3896 // definition would be, 3897 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3898 3899 // -- it is implicitly considered to have the same 3900 // exception-specification as if it had been implicitly declared, and 3901 // 3902 // FIXME: a compatible, but different, explicit exception specification 3903 // will be silently overridden. We should issue a warning if this happens. 3904 EPI.ExtInfo = CtorType->getExtInfo(); 3905 3906 // -- [...] it shall have the same parameter type as if it had been 3907 // implicitly declared. 3908 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3909 } 3910 3911 if (HadError) { 3912 CD->setInvalidDecl(); 3913 return; 3914 } 3915 3916 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3917 if (First) { 3918 CD->setDeletedAsWritten(); 3919 } else { 3920 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3921 << CXXCopyConstructor; 3922 CD->setInvalidDecl(); 3923 } 3924 } 3925} 3926 3927void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3928 assert(MD->isExplicitlyDefaulted()); 3929 3930 // Whether this was the first-declared instance of the operator 3931 bool First = MD == MD->getCanonicalDecl(); 3932 3933 bool HadError = false; 3934 if (MD->getNumParams() != 1) { 3935 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3936 << MD->getSourceRange(); 3937 HadError = true; 3938 } 3939 3940 QualType ReturnType = 3941 MD->getType()->getAs<FunctionType>()->getResultType(); 3942 if (!ReturnType->isLValueReferenceType() || 3943 !Context.hasSameType( 3944 Context.getCanonicalType(ReturnType->getPointeeType()), 3945 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3946 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3947 HadError = true; 3948 } 3949 3950 ImplicitExceptionSpecification Spec(Context); 3951 bool Const; 3952 llvm::tie(Spec, Const) = 3953 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3954 3955 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3956 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3957 *ExceptionType = Context.getFunctionType( 3958 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3959 3960 QualType ArgType = OperType->getArgType(0); 3961 if (!ArgType->isLValueReferenceType()) { 3962 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3963 HadError = true; 3964 } else { 3965 if (ArgType->getPointeeType().isVolatileQualified()) { 3966 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3967 HadError = true; 3968 } 3969 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3970 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3971 HadError = true; 3972 } 3973 } 3974 3975 if (OperType->getTypeQuals()) { 3976 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3977 HadError = true; 3978 } 3979 3980 if (OperType->hasExceptionSpec()) { 3981 if (CheckEquivalentExceptionSpec( 3982 PDiag(diag::err_incorrect_defaulted_exception_spec) 3983 << CXXCopyAssignment, 3984 PDiag(), 3985 ExceptionType, SourceLocation(), 3986 OperType, MD->getLocation())) { 3987 HadError = true; 3988 } 3989 } 3990 if (First) { 3991 // We set the declaration to have the computed exception spec here. 3992 // We duplicate the one parameter type. 3993 EPI.RefQualifier = OperType->getRefQualifier(); 3994 EPI.ExtInfo = OperType->getExtInfo(); 3995 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3996 } 3997 3998 if (HadError) { 3999 MD->setInvalidDecl(); 4000 return; 4001 } 4002 4003 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4004 if (First) { 4005 MD->setDeletedAsWritten(); 4006 } else { 4007 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4008 << CXXCopyAssignment; 4009 MD->setInvalidDecl(); 4010 } 4011 } 4012} 4013 4014void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4015 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4016 4017 // Whether this was the first-declared instance of the constructor. 4018 bool First = CD == CD->getCanonicalDecl(); 4019 4020 bool HadError = false; 4021 if (CD->getNumParams() != 1) { 4022 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4023 << CD->getSourceRange(); 4024 HadError = true; 4025 } 4026 4027 ImplicitExceptionSpecification Spec( 4028 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4029 4030 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4031 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4032 *ExceptionType = Context.getFunctionType( 4033 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4034 4035 // Check for parameter type matching. 4036 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4037 QualType ArgType = CtorType->getArgType(0); 4038 if (ArgType->getPointeeType().isVolatileQualified()) { 4039 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4040 HadError = true; 4041 } 4042 if (ArgType->getPointeeType().isConstQualified()) { 4043 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4044 HadError = true; 4045 } 4046 4047 // C++11 [dcl.fct.def.default]p2: 4048 // An explicitly-defaulted function may be declared constexpr only if it 4049 // would have been implicitly declared as constexpr, 4050 if (CD->isConstexpr()) { 4051 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4052 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4053 << CXXMoveConstructor; 4054 HadError = true; 4055 } 4056 } 4057 // and may have an explicit exception-specification only if it is compatible 4058 // with the exception-specification on the implicit declaration. 4059 if (CtorType->hasExceptionSpec()) { 4060 if (CheckEquivalentExceptionSpec( 4061 PDiag(diag::err_incorrect_defaulted_exception_spec) 4062 << CXXMoveConstructor, 4063 PDiag(), 4064 ExceptionType, SourceLocation(), 4065 CtorType, CD->getLocation())) { 4066 HadError = true; 4067 } 4068 } 4069 4070 // If a function is explicitly defaulted on its first declaration, 4071 if (First) { 4072 // -- it is implicitly considered to be constexpr if the implicit 4073 // definition would be, 4074 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4075 4076 // -- it is implicitly considered to have the same 4077 // exception-specification as if it had been implicitly declared, and 4078 // 4079 // FIXME: a compatible, but different, explicit exception specification 4080 // will be silently overridden. We should issue a warning if this happens. 4081 EPI.ExtInfo = CtorType->getExtInfo(); 4082 4083 // -- [...] it shall have the same parameter type as if it had been 4084 // implicitly declared. 4085 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4086 } 4087 4088 if (HadError) { 4089 CD->setInvalidDecl(); 4090 return; 4091 } 4092 4093 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4094 if (First) { 4095 CD->setDeletedAsWritten(); 4096 } else { 4097 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4098 << CXXMoveConstructor; 4099 CD->setInvalidDecl(); 4100 } 4101 } 4102} 4103 4104void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4105 assert(MD->isExplicitlyDefaulted()); 4106 4107 // Whether this was the first-declared instance of the operator 4108 bool First = MD == MD->getCanonicalDecl(); 4109 4110 bool HadError = false; 4111 if (MD->getNumParams() != 1) { 4112 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4113 << MD->getSourceRange(); 4114 HadError = true; 4115 } 4116 4117 QualType ReturnType = 4118 MD->getType()->getAs<FunctionType>()->getResultType(); 4119 if (!ReturnType->isLValueReferenceType() || 4120 !Context.hasSameType( 4121 Context.getCanonicalType(ReturnType->getPointeeType()), 4122 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4123 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4124 HadError = true; 4125 } 4126 4127 ImplicitExceptionSpecification Spec( 4128 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4129 4130 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4131 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4132 *ExceptionType = Context.getFunctionType( 4133 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4134 4135 QualType ArgType = OperType->getArgType(0); 4136 if (!ArgType->isRValueReferenceType()) { 4137 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4138 HadError = true; 4139 } else { 4140 if (ArgType->getPointeeType().isVolatileQualified()) { 4141 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4142 HadError = true; 4143 } 4144 if (ArgType->getPointeeType().isConstQualified()) { 4145 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4146 HadError = true; 4147 } 4148 } 4149 4150 if (OperType->getTypeQuals()) { 4151 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4152 HadError = true; 4153 } 4154 4155 if (OperType->hasExceptionSpec()) { 4156 if (CheckEquivalentExceptionSpec( 4157 PDiag(diag::err_incorrect_defaulted_exception_spec) 4158 << CXXMoveAssignment, 4159 PDiag(), 4160 ExceptionType, SourceLocation(), 4161 OperType, MD->getLocation())) { 4162 HadError = true; 4163 } 4164 } 4165 if (First) { 4166 // We set the declaration to have the computed exception spec here. 4167 // We duplicate the one parameter type. 4168 EPI.RefQualifier = OperType->getRefQualifier(); 4169 EPI.ExtInfo = OperType->getExtInfo(); 4170 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4171 } 4172 4173 if (HadError) { 4174 MD->setInvalidDecl(); 4175 return; 4176 } 4177 4178 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4179 if (First) { 4180 MD->setDeletedAsWritten(); 4181 } else { 4182 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4183 << CXXMoveAssignment; 4184 MD->setInvalidDecl(); 4185 } 4186 } 4187} 4188 4189void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4190 assert(DD->isExplicitlyDefaulted()); 4191 4192 // Whether this was the first-declared instance of the destructor. 4193 bool First = DD == DD->getCanonicalDecl(); 4194 4195 ImplicitExceptionSpecification Spec 4196 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4197 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4198 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4199 *ExceptionType = Context.getFunctionType( 4200 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4201 4202 if (DtorType->hasExceptionSpec()) { 4203 if (CheckEquivalentExceptionSpec( 4204 PDiag(diag::err_incorrect_defaulted_exception_spec) 4205 << CXXDestructor, 4206 PDiag(), 4207 ExceptionType, SourceLocation(), 4208 DtorType, DD->getLocation())) { 4209 DD->setInvalidDecl(); 4210 return; 4211 } 4212 } 4213 if (First) { 4214 // We set the declaration to have the computed exception spec here. 4215 // There are no parameters. 4216 EPI.ExtInfo = DtorType->getExtInfo(); 4217 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4218 } 4219 4220 if (ShouldDeleteDestructor(DD)) { 4221 if (First) { 4222 DD->setDeletedAsWritten(); 4223 } else { 4224 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4225 << CXXDestructor; 4226 DD->setInvalidDecl(); 4227 } 4228 } 4229} 4230 4231/// This function implements the following C++0x paragraphs: 4232/// - [class.ctor]/5 4233/// - [class.copy]/11 4234bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4235 assert(!MD->isInvalidDecl()); 4236 CXXRecordDecl *RD = MD->getParent(); 4237 assert(!RD->isDependentType() && "do deletion after instantiation"); 4238 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4239 return false; 4240 4241 bool IsUnion = RD->isUnion(); 4242 bool IsConstructor = false; 4243 bool IsAssignment = false; 4244 bool IsMove = false; 4245 4246 bool ConstArg = false; 4247 4248 switch (CSM) { 4249 case CXXDefaultConstructor: 4250 IsConstructor = true; 4251 break; 4252 case CXXCopyConstructor: 4253 IsConstructor = true; 4254 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4255 break; 4256 case CXXMoveConstructor: 4257 IsConstructor = true; 4258 IsMove = true; 4259 break; 4260 default: 4261 llvm_unreachable("function only currently implemented for default ctors"); 4262 } 4263 4264 SourceLocation Loc = MD->getLocation(); 4265 4266 // Do access control from the special member function 4267 ContextRAII MethodContext(*this, MD); 4268 4269 bool AllConst = true; 4270 4271 // We do this because we should never actually use an anonymous 4272 // union's constructor. 4273 if (IsUnion && RD->isAnonymousStructOrUnion()) 4274 return false; 4275 4276 // FIXME: We should put some diagnostic logic right into this function. 4277 4278 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4279 BE = RD->bases_end(); 4280 BI != BE; ++BI) { 4281 // We'll handle this one later 4282 if (BI->isVirtual()) 4283 continue; 4284 4285 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4286 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4287 4288 // Unless we have an assignment operator, the base's destructor must 4289 // be accessible and not deleted. 4290 if (!IsAssignment) { 4291 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4292 if (BaseDtor->isDeleted()) 4293 return true; 4294 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4295 AR_accessible) 4296 return true; 4297 } 4298 4299 // Finding the corresponding member in the base should lead to a 4300 // unique, accessible, non-deleted function. If we are doing 4301 // a destructor, we have already checked this case. 4302 if (CSM != CXXDestructor) { 4303 SpecialMemberOverloadResult *SMOR = 4304 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4305 false); 4306 if (!SMOR->hasSuccess()) 4307 return true; 4308 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4309 if (IsConstructor) { 4310 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4311 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4312 PDiag()) != AR_accessible) 4313 return true; 4314 4315 // For a move operation, the corresponding operation must actually 4316 // be a move operation (and not a copy selected by overload 4317 // resolution) unless we are working on a trivially copyable class. 4318 if (IsMove && !BaseCtor->isMoveConstructor() && 4319 !BaseDecl->isTriviallyCopyable()) 4320 return true; 4321 } 4322 } 4323 } 4324 4325 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4326 BE = RD->vbases_end(); 4327 BI != BE; ++BI) { 4328 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4329 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4330 4331 // Unless we have an assignment operator, the base's destructor must 4332 // be accessible and not deleted. 4333 if (!IsAssignment) { 4334 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4335 if (BaseDtor->isDeleted()) 4336 return true; 4337 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4338 AR_accessible) 4339 return true; 4340 } 4341 4342 // Finding the corresponding member in the base should lead to a 4343 // unique, accessible, non-deleted function. 4344 if (CSM != CXXDestructor) { 4345 SpecialMemberOverloadResult *SMOR = 4346 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4347 false); 4348 if (!SMOR->hasSuccess()) 4349 return true; 4350 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4351 if (IsConstructor) { 4352 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4353 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4354 PDiag()) != AR_accessible) 4355 return true; 4356 4357 // For a move operation, the corresponding operation must actually 4358 // be a move operation (and not a copy selected by overload 4359 // resolution) unless we are working on a trivially copyable class. 4360 if (IsMove && !BaseCtor->isMoveConstructor() && 4361 !BaseDecl->isTriviallyCopyable()) 4362 return true; 4363 } 4364 } 4365 } 4366 4367 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4368 FE = RD->field_end(); 4369 FI != FE; ++FI) { 4370 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4371 continue; 4372 4373 QualType FieldType = Context.getBaseElementType(FI->getType()); 4374 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4375 4376 // For a default constructor, all references must be initialized in-class 4377 // and, if a union, it must have a non-const member. 4378 if (CSM == CXXDefaultConstructor) { 4379 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4380 return true; 4381 4382 if (IsUnion && !FieldType.isConstQualified()) 4383 AllConst = false; 4384 // For a copy constructor, data members must not be of rvalue reference 4385 // type. 4386 } else if (CSM == CXXCopyConstructor) { 4387 if (FieldType->isRValueReferenceType()) 4388 return true; 4389 } 4390 4391 if (FieldRecord) { 4392 // For a default constructor, a const member must have a user-provided 4393 // default constructor or else be explicitly initialized. 4394 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4395 !FI->hasInClassInitializer() && 4396 !FieldRecord->hasUserProvidedDefaultConstructor()) 4397 return true; 4398 4399 // Some additional restrictions exist on the variant members. 4400 if (!IsUnion && FieldRecord->isUnion() && 4401 FieldRecord->isAnonymousStructOrUnion()) { 4402 // We're okay to reuse AllConst here since we only care about the 4403 // value otherwise if we're in a union. 4404 AllConst = true; 4405 4406 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4407 UE = FieldRecord->field_end(); 4408 UI != UE; ++UI) { 4409 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4410 CXXRecordDecl *UnionFieldRecord = 4411 UnionFieldType->getAsCXXRecordDecl(); 4412 4413 if (!UnionFieldType.isConstQualified()) 4414 AllConst = false; 4415 4416 if (UnionFieldRecord) { 4417 // FIXME: Checking for accessibility and validity of this 4418 // destructor is technically going beyond the 4419 // standard, but this is believed to be a defect. 4420 if (!IsAssignment) { 4421 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4422 if (FieldDtor->isDeleted()) 4423 return true; 4424 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4425 AR_accessible) 4426 return true; 4427 if (!FieldDtor->isTrivial()) 4428 return true; 4429 } 4430 4431 if (CSM != CXXDestructor) { 4432 SpecialMemberOverloadResult *SMOR = 4433 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4434 false, false, false); 4435 // FIXME: Checking for accessibility and validity of this 4436 // corresponding member is technically going beyond the 4437 // standard, but this is believed to be a defect. 4438 if (!SMOR->hasSuccess()) 4439 return true; 4440 4441 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4442 // A member of a union must have a trivial corresponding 4443 // constructor. 4444 if (!FieldMember->isTrivial()) 4445 return true; 4446 4447 if (IsConstructor) { 4448 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4449 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4450 PDiag()) != AR_accessible) 4451 return true; 4452 } 4453 } 4454 } 4455 } 4456 4457 // At least one member in each anonymous union must be non-const 4458 if (CSM == CXXDefaultConstructor && AllConst) 4459 return true; 4460 4461 // Don't try to initialize the anonymous union 4462 // This is technically non-conformant, but sanity demands it. 4463 continue; 4464 } 4465 4466 // Unless we're doing assignment, the field's destructor must be 4467 // accessible and not deleted. 4468 if (!IsAssignment) { 4469 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4470 if (FieldDtor->isDeleted()) 4471 return true; 4472 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4473 AR_accessible) 4474 return true; 4475 } 4476 4477 // Check that the corresponding member of the field is accessible, 4478 // unique, and non-deleted. We don't do this if it has an explicit 4479 // initialization when default-constructing. 4480 if (CSM != CXXDestructor && 4481 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4482 SpecialMemberOverloadResult *SMOR = 4483 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4484 false); 4485 if (!SMOR->hasSuccess()) 4486 return true; 4487 4488 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4489 if (IsConstructor) { 4490 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4491 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4492 PDiag()) != AR_accessible) 4493 return true; 4494 4495 // For a move operation, the corresponding operation must actually 4496 // be a move operation (and not a copy selected by overload 4497 // resolution) unless we are working on a trivially copyable class. 4498 if (IsMove && !FieldCtor->isMoveConstructor() && 4499 !FieldRecord->isTriviallyCopyable()) 4500 return true; 4501 } 4502 4503 // We need the corresponding member of a union to be trivial so that 4504 // we can safely copy them all simultaneously. 4505 // FIXME: Note that performing the check here (where we rely on the lack 4506 // of an in-class initializer) is technically ill-formed. However, this 4507 // seems most obviously to be a bug in the standard. 4508 if (IsUnion && !FieldMember->isTrivial()) 4509 return true; 4510 } 4511 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4512 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4513 // We can't initialize a const member of non-class type to any value. 4514 return true; 4515 } 4516 } 4517 4518 // We can't have all const members in a union when default-constructing, 4519 // or else they're all nonsensical garbage values that can't be changed. 4520 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4521 return true; 4522 4523 return false; 4524} 4525 4526bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4527 CXXRecordDecl *RD = MD->getParent(); 4528 assert(!RD->isDependentType() && "do deletion after instantiation"); 4529 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4530 return false; 4531 4532 SourceLocation Loc = MD->getLocation(); 4533 4534 // Do access control from the constructor 4535 ContextRAII MethodContext(*this, MD); 4536 4537 bool Union = RD->isUnion(); 4538 4539 unsigned ArgQuals = 4540 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4541 Qualifiers::Const : 0; 4542 4543 // We do this because we should never actually use an anonymous 4544 // union's constructor. 4545 if (Union && RD->isAnonymousStructOrUnion()) 4546 return false; 4547 4548 // FIXME: We should put some diagnostic logic right into this function. 4549 4550 // C++0x [class.copy]/20 4551 // A defaulted [copy] assignment operator for class X is defined as deleted 4552 // if X has: 4553 4554 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4555 BE = RD->bases_end(); 4556 BI != BE; ++BI) { 4557 // We'll handle this one later 4558 if (BI->isVirtual()) 4559 continue; 4560 4561 QualType BaseType = BI->getType(); 4562 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4563 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4564 4565 // -- a [direct base class] B that cannot be [copied] because overload 4566 // resolution, as applied to B's [copy] assignment operator, results in 4567 // an ambiguity or a function that is deleted or inaccessible from the 4568 // assignment operator 4569 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4570 0); 4571 if (!CopyOper || CopyOper->isDeleted()) 4572 return true; 4573 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4574 return true; 4575 } 4576 4577 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4578 BE = RD->vbases_end(); 4579 BI != BE; ++BI) { 4580 QualType BaseType = BI->getType(); 4581 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4582 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4583 4584 // -- a [virtual base class] B that cannot be [copied] because overload 4585 // resolution, as applied to B's [copy] assignment operator, results in 4586 // an ambiguity or a function that is deleted or inaccessible from the 4587 // assignment operator 4588 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4589 0); 4590 if (!CopyOper || CopyOper->isDeleted()) 4591 return true; 4592 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4593 return true; 4594 } 4595 4596 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4597 FE = RD->field_end(); 4598 FI != FE; ++FI) { 4599 if (FI->isUnnamedBitfield()) 4600 continue; 4601 4602 QualType FieldType = Context.getBaseElementType(FI->getType()); 4603 4604 // -- a non-static data member of reference type 4605 if (FieldType->isReferenceType()) 4606 return true; 4607 4608 // -- a non-static data member of const non-class type (or array thereof) 4609 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4610 return true; 4611 4612 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4613 4614 if (FieldRecord) { 4615 // This is an anonymous union 4616 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4617 // Anonymous unions inside unions do not variant members create 4618 if (!Union) { 4619 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4620 UE = FieldRecord->field_end(); 4621 UI != UE; ++UI) { 4622 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4623 CXXRecordDecl *UnionFieldRecord = 4624 UnionFieldType->getAsCXXRecordDecl(); 4625 4626 // -- a variant member with a non-trivial [copy] assignment operator 4627 // and X is a union-like class 4628 if (UnionFieldRecord && 4629 !UnionFieldRecord->hasTrivialCopyAssignment()) 4630 return true; 4631 } 4632 } 4633 4634 // Don't try to initalize an anonymous union 4635 continue; 4636 // -- a variant member with a non-trivial [copy] assignment operator 4637 // and X is a union-like class 4638 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4639 return true; 4640 } 4641 4642 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4643 false, 0); 4644 if (!CopyOper || CopyOper->isDeleted()) 4645 return true; 4646 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4647 return true; 4648 } 4649 } 4650 4651 return false; 4652} 4653 4654bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4655 CXXRecordDecl *RD = MD->getParent(); 4656 assert(!RD->isDependentType() && "do deletion after instantiation"); 4657 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4658 return false; 4659 4660 SourceLocation Loc = MD->getLocation(); 4661 4662 // Do access control from the constructor 4663 ContextRAII MethodContext(*this, MD); 4664 4665 bool Union = RD->isUnion(); 4666 4667 // We do this because we should never actually use an anonymous 4668 // union's constructor. 4669 if (Union && RD->isAnonymousStructOrUnion()) 4670 return false; 4671 4672 // C++0x [class.copy]/20 4673 // A defaulted [move] assignment operator for class X is defined as deleted 4674 // if X has: 4675 4676 // -- for the move constructor, [...] any direct or indirect virtual base 4677 // class. 4678 if (RD->getNumVBases() != 0) 4679 return true; 4680 4681 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4682 BE = RD->bases_end(); 4683 BI != BE; ++BI) { 4684 4685 QualType BaseType = BI->getType(); 4686 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4687 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4688 4689 // -- a [direct base class] B that cannot be [moved] because overload 4690 // resolution, as applied to B's [move] assignment operator, results in 4691 // an ambiguity or a function that is deleted or inaccessible from the 4692 // assignment operator 4693 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4694 if (!MoveOper || MoveOper->isDeleted()) 4695 return true; 4696 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4697 return true; 4698 4699 // -- for the move assignment operator, a [direct base class] with a type 4700 // that does not have a move assignment operator and is not trivially 4701 // copyable. 4702 if (!MoveOper->isMoveAssignmentOperator() && 4703 !BaseDecl->isTriviallyCopyable()) 4704 return true; 4705 } 4706 4707 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4708 FE = RD->field_end(); 4709 FI != FE; ++FI) { 4710 if (FI->isUnnamedBitfield()) 4711 continue; 4712 4713 QualType FieldType = Context.getBaseElementType(FI->getType()); 4714 4715 // -- a non-static data member of reference type 4716 if (FieldType->isReferenceType()) 4717 return true; 4718 4719 // -- a non-static data member of const non-class type (or array thereof) 4720 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4721 return true; 4722 4723 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4724 4725 if (FieldRecord) { 4726 // This is an anonymous union 4727 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4728 // Anonymous unions inside unions do not variant members create 4729 if (!Union) { 4730 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4731 UE = FieldRecord->field_end(); 4732 UI != UE; ++UI) { 4733 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4734 CXXRecordDecl *UnionFieldRecord = 4735 UnionFieldType->getAsCXXRecordDecl(); 4736 4737 // -- a variant member with a non-trivial [move] assignment operator 4738 // and X is a union-like class 4739 if (UnionFieldRecord && 4740 !UnionFieldRecord->hasTrivialMoveAssignment()) 4741 return true; 4742 } 4743 } 4744 4745 // Don't try to initalize an anonymous union 4746 continue; 4747 // -- a variant member with a non-trivial [move] assignment operator 4748 // and X is a union-like class 4749 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4750 return true; 4751 } 4752 4753 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4754 if (!MoveOper || MoveOper->isDeleted()) 4755 return true; 4756 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4757 return true; 4758 4759 // -- for the move assignment operator, a [non-static data member] with a 4760 // type that does not have a move assignment operator and is not 4761 // trivially copyable. 4762 if (!MoveOper->isMoveAssignmentOperator() && 4763 !FieldRecord->isTriviallyCopyable()) 4764 return true; 4765 } 4766 } 4767 4768 return false; 4769} 4770 4771bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4772 CXXRecordDecl *RD = DD->getParent(); 4773 assert(!RD->isDependentType() && "do deletion after instantiation"); 4774 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4775 return false; 4776 4777 SourceLocation Loc = DD->getLocation(); 4778 4779 // Do access control from the destructor 4780 ContextRAII CtorContext(*this, DD); 4781 4782 bool Union = RD->isUnion(); 4783 4784 // We do this because we should never actually use an anonymous 4785 // union's destructor. 4786 if (Union && RD->isAnonymousStructOrUnion()) 4787 return false; 4788 4789 // C++0x [class.dtor]p5 4790 // A defaulted destructor for a class X is defined as deleted if: 4791 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4792 BE = RD->bases_end(); 4793 BI != BE; ++BI) { 4794 // We'll handle this one later 4795 if (BI->isVirtual()) 4796 continue; 4797 4798 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4799 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4800 assert(BaseDtor && "base has no destructor"); 4801 4802 // -- any direct or virtual base class has a deleted destructor or 4803 // a destructor that is inaccessible from the defaulted destructor 4804 if (BaseDtor->isDeleted()) 4805 return true; 4806 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4807 AR_accessible) 4808 return true; 4809 } 4810 4811 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4812 BE = RD->vbases_end(); 4813 BI != BE; ++BI) { 4814 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4815 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4816 assert(BaseDtor && "base has no destructor"); 4817 4818 // -- any direct or virtual base class has a deleted destructor or 4819 // a destructor that is inaccessible from the defaulted destructor 4820 if (BaseDtor->isDeleted()) 4821 return true; 4822 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4823 AR_accessible) 4824 return true; 4825 } 4826 4827 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4828 FE = RD->field_end(); 4829 FI != FE; ++FI) { 4830 QualType FieldType = Context.getBaseElementType(FI->getType()); 4831 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4832 if (FieldRecord) { 4833 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4834 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4835 UE = FieldRecord->field_end(); 4836 UI != UE; ++UI) { 4837 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4838 CXXRecordDecl *UnionFieldRecord = 4839 UnionFieldType->getAsCXXRecordDecl(); 4840 4841 // -- X is a union-like class that has a variant member with a non- 4842 // trivial destructor. 4843 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4844 return true; 4845 } 4846 // Technically we are supposed to do this next check unconditionally. 4847 // But that makes absolutely no sense. 4848 } else { 4849 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4850 4851 // -- any of the non-static data members has class type M (or array 4852 // thereof) and M has a deleted destructor or a destructor that is 4853 // inaccessible from the defaulted destructor 4854 if (FieldDtor->isDeleted()) 4855 return true; 4856 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4857 AR_accessible) 4858 return true; 4859 4860 // -- X is a union-like class that has a variant member with a non- 4861 // trivial destructor. 4862 if (Union && !FieldDtor->isTrivial()) 4863 return true; 4864 } 4865 } 4866 } 4867 4868 if (DD->isVirtual()) { 4869 FunctionDecl *OperatorDelete = 0; 4870 DeclarationName Name = 4871 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4872 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4873 false)) 4874 return true; 4875 } 4876 4877 4878 return false; 4879} 4880 4881/// \brief Data used with FindHiddenVirtualMethod 4882namespace { 4883 struct FindHiddenVirtualMethodData { 4884 Sema *S; 4885 CXXMethodDecl *Method; 4886 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4887 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4888 }; 4889} 4890 4891/// \brief Member lookup function that determines whether a given C++ 4892/// method overloads virtual methods in a base class without overriding any, 4893/// to be used with CXXRecordDecl::lookupInBases(). 4894static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4895 CXXBasePath &Path, 4896 void *UserData) { 4897 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4898 4899 FindHiddenVirtualMethodData &Data 4900 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4901 4902 DeclarationName Name = Data.Method->getDeclName(); 4903 assert(Name.getNameKind() == DeclarationName::Identifier); 4904 4905 bool foundSameNameMethod = false; 4906 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4907 for (Path.Decls = BaseRecord->lookup(Name); 4908 Path.Decls.first != Path.Decls.second; 4909 ++Path.Decls.first) { 4910 NamedDecl *D = *Path.Decls.first; 4911 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4912 MD = MD->getCanonicalDecl(); 4913 foundSameNameMethod = true; 4914 // Interested only in hidden virtual methods. 4915 if (!MD->isVirtual()) 4916 continue; 4917 // If the method we are checking overrides a method from its base 4918 // don't warn about the other overloaded methods. 4919 if (!Data.S->IsOverload(Data.Method, MD, false)) 4920 return true; 4921 // Collect the overload only if its hidden. 4922 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4923 overloadedMethods.push_back(MD); 4924 } 4925 } 4926 4927 if (foundSameNameMethod) 4928 Data.OverloadedMethods.append(overloadedMethods.begin(), 4929 overloadedMethods.end()); 4930 return foundSameNameMethod; 4931} 4932 4933/// \brief See if a method overloads virtual methods in a base class without 4934/// overriding any. 4935void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4936 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4937 MD->getLocation()) == DiagnosticsEngine::Ignored) 4938 return; 4939 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4940 return; 4941 4942 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4943 /*bool RecordPaths=*/false, 4944 /*bool DetectVirtual=*/false); 4945 FindHiddenVirtualMethodData Data; 4946 Data.Method = MD; 4947 Data.S = this; 4948 4949 // Keep the base methods that were overriden or introduced in the subclass 4950 // by 'using' in a set. A base method not in this set is hidden. 4951 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4952 res.first != res.second; ++res.first) { 4953 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4954 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4955 E = MD->end_overridden_methods(); 4956 I != E; ++I) 4957 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4958 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4959 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4960 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4961 } 4962 4963 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4964 !Data.OverloadedMethods.empty()) { 4965 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4966 << MD << (Data.OverloadedMethods.size() > 1); 4967 4968 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4969 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4970 Diag(overloadedMD->getLocation(), 4971 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4972 } 4973 } 4974} 4975 4976void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4977 Decl *TagDecl, 4978 SourceLocation LBrac, 4979 SourceLocation RBrac, 4980 AttributeList *AttrList) { 4981 if (!TagDecl) 4982 return; 4983 4984 AdjustDeclIfTemplate(TagDecl); 4985 4986 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4987 // strict aliasing violation! 4988 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4989 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4990 4991 CheckCompletedCXXClass( 4992 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4993} 4994 4995/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4996/// special functions, such as the default constructor, copy 4997/// constructor, or destructor, to the given C++ class (C++ 4998/// [special]p1). This routine can only be executed just before the 4999/// definition of the class is complete. 5000void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5001 if (!ClassDecl->hasUserDeclaredConstructor()) 5002 ++ASTContext::NumImplicitDefaultConstructors; 5003 5004 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5005 ++ASTContext::NumImplicitCopyConstructors; 5006 5007 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5008 ++ASTContext::NumImplicitMoveConstructors; 5009 5010 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5011 ++ASTContext::NumImplicitCopyAssignmentOperators; 5012 5013 // If we have a dynamic class, then the copy assignment operator may be 5014 // virtual, so we have to declare it immediately. This ensures that, e.g., 5015 // it shows up in the right place in the vtable and that we diagnose 5016 // problems with the implicit exception specification. 5017 if (ClassDecl->isDynamicClass()) 5018 DeclareImplicitCopyAssignment(ClassDecl); 5019 } 5020 5021 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5022 ++ASTContext::NumImplicitMoveAssignmentOperators; 5023 5024 // Likewise for the move assignment operator. 5025 if (ClassDecl->isDynamicClass()) 5026 DeclareImplicitMoveAssignment(ClassDecl); 5027 } 5028 5029 if (!ClassDecl->hasUserDeclaredDestructor()) { 5030 ++ASTContext::NumImplicitDestructors; 5031 5032 // If we have a dynamic class, then the destructor may be virtual, so we 5033 // have to declare the destructor immediately. This ensures that, e.g., it 5034 // shows up in the right place in the vtable and that we diagnose problems 5035 // with the implicit exception specification. 5036 if (ClassDecl->isDynamicClass()) 5037 DeclareImplicitDestructor(ClassDecl); 5038 } 5039} 5040 5041void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5042 if (!D) 5043 return; 5044 5045 int NumParamList = D->getNumTemplateParameterLists(); 5046 for (int i = 0; i < NumParamList; i++) { 5047 TemplateParameterList* Params = D->getTemplateParameterList(i); 5048 for (TemplateParameterList::iterator Param = Params->begin(), 5049 ParamEnd = Params->end(); 5050 Param != ParamEnd; ++Param) { 5051 NamedDecl *Named = cast<NamedDecl>(*Param); 5052 if (Named->getDeclName()) { 5053 S->AddDecl(Named); 5054 IdResolver.AddDecl(Named); 5055 } 5056 } 5057 } 5058} 5059 5060void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5061 if (!D) 5062 return; 5063 5064 TemplateParameterList *Params = 0; 5065 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5066 Params = Template->getTemplateParameters(); 5067 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5068 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5069 Params = PartialSpec->getTemplateParameters(); 5070 else 5071 return; 5072 5073 for (TemplateParameterList::iterator Param = Params->begin(), 5074 ParamEnd = Params->end(); 5075 Param != ParamEnd; ++Param) { 5076 NamedDecl *Named = cast<NamedDecl>(*Param); 5077 if (Named->getDeclName()) { 5078 S->AddDecl(Named); 5079 IdResolver.AddDecl(Named); 5080 } 5081 } 5082} 5083 5084void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5085 if (!RecordD) return; 5086 AdjustDeclIfTemplate(RecordD); 5087 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5088 PushDeclContext(S, Record); 5089} 5090 5091void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5092 if (!RecordD) return; 5093 PopDeclContext(); 5094} 5095 5096/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5097/// parsing a top-level (non-nested) C++ class, and we are now 5098/// parsing those parts of the given Method declaration that could 5099/// not be parsed earlier (C++ [class.mem]p2), such as default 5100/// arguments. This action should enter the scope of the given 5101/// Method declaration as if we had just parsed the qualified method 5102/// name. However, it should not bring the parameters into scope; 5103/// that will be performed by ActOnDelayedCXXMethodParameter. 5104void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5105} 5106 5107/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5108/// C++ method declaration. We're (re-)introducing the given 5109/// function parameter into scope for use in parsing later parts of 5110/// the method declaration. For example, we could see an 5111/// ActOnParamDefaultArgument event for this parameter. 5112void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5113 if (!ParamD) 5114 return; 5115 5116 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5117 5118 // If this parameter has an unparsed default argument, clear it out 5119 // to make way for the parsed default argument. 5120 if (Param->hasUnparsedDefaultArg()) 5121 Param->setDefaultArg(0); 5122 5123 S->AddDecl(Param); 5124 if (Param->getDeclName()) 5125 IdResolver.AddDecl(Param); 5126} 5127 5128/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5129/// processing the delayed method declaration for Method. The method 5130/// declaration is now considered finished. There may be a separate 5131/// ActOnStartOfFunctionDef action later (not necessarily 5132/// immediately!) for this method, if it was also defined inside the 5133/// class body. 5134void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5135 if (!MethodD) 5136 return; 5137 5138 AdjustDeclIfTemplate(MethodD); 5139 5140 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5141 5142 // Now that we have our default arguments, check the constructor 5143 // again. It could produce additional diagnostics or affect whether 5144 // the class has implicitly-declared destructors, among other 5145 // things. 5146 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5147 CheckConstructor(Constructor); 5148 5149 // Check the default arguments, which we may have added. 5150 if (!Method->isInvalidDecl()) 5151 CheckCXXDefaultArguments(Method); 5152} 5153 5154/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5155/// the well-formedness of the constructor declarator @p D with type @p 5156/// R. If there are any errors in the declarator, this routine will 5157/// emit diagnostics and set the invalid bit to true. In any case, the type 5158/// will be updated to reflect a well-formed type for the constructor and 5159/// returned. 5160QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5161 StorageClass &SC) { 5162 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5163 5164 // C++ [class.ctor]p3: 5165 // A constructor shall not be virtual (10.3) or static (9.4). A 5166 // constructor can be invoked for a const, volatile or const 5167 // volatile object. A constructor shall not be declared const, 5168 // volatile, or const volatile (9.3.2). 5169 if (isVirtual) { 5170 if (!D.isInvalidType()) 5171 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5172 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5173 << SourceRange(D.getIdentifierLoc()); 5174 D.setInvalidType(); 5175 } 5176 if (SC == SC_Static) { 5177 if (!D.isInvalidType()) 5178 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5179 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5180 << SourceRange(D.getIdentifierLoc()); 5181 D.setInvalidType(); 5182 SC = SC_None; 5183 } 5184 5185 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5186 if (FTI.TypeQuals != 0) { 5187 if (FTI.TypeQuals & Qualifiers::Const) 5188 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5189 << "const" << SourceRange(D.getIdentifierLoc()); 5190 if (FTI.TypeQuals & Qualifiers::Volatile) 5191 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5192 << "volatile" << SourceRange(D.getIdentifierLoc()); 5193 if (FTI.TypeQuals & Qualifiers::Restrict) 5194 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5195 << "restrict" << SourceRange(D.getIdentifierLoc()); 5196 D.setInvalidType(); 5197 } 5198 5199 // C++0x [class.ctor]p4: 5200 // A constructor shall not be declared with a ref-qualifier. 5201 if (FTI.hasRefQualifier()) { 5202 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5203 << FTI.RefQualifierIsLValueRef 5204 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5205 D.setInvalidType(); 5206 } 5207 5208 // Rebuild the function type "R" without any type qualifiers (in 5209 // case any of the errors above fired) and with "void" as the 5210 // return type, since constructors don't have return types. 5211 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5212 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5213 return R; 5214 5215 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5216 EPI.TypeQuals = 0; 5217 EPI.RefQualifier = RQ_None; 5218 5219 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5220 Proto->getNumArgs(), EPI); 5221} 5222 5223/// CheckConstructor - Checks a fully-formed constructor for 5224/// well-formedness, issuing any diagnostics required. Returns true if 5225/// the constructor declarator is invalid. 5226void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5227 CXXRecordDecl *ClassDecl 5228 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5229 if (!ClassDecl) 5230 return Constructor->setInvalidDecl(); 5231 5232 // C++ [class.copy]p3: 5233 // A declaration of a constructor for a class X is ill-formed if 5234 // its first parameter is of type (optionally cv-qualified) X and 5235 // either there are no other parameters or else all other 5236 // parameters have default arguments. 5237 if (!Constructor->isInvalidDecl() && 5238 ((Constructor->getNumParams() == 1) || 5239 (Constructor->getNumParams() > 1 && 5240 Constructor->getParamDecl(1)->hasDefaultArg())) && 5241 Constructor->getTemplateSpecializationKind() 5242 != TSK_ImplicitInstantiation) { 5243 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5244 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5245 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5246 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5247 const char *ConstRef 5248 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5249 : " const &"; 5250 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5251 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5252 5253 // FIXME: Rather that making the constructor invalid, we should endeavor 5254 // to fix the type. 5255 Constructor->setInvalidDecl(); 5256 } 5257 } 5258} 5259 5260/// CheckDestructor - Checks a fully-formed destructor definition for 5261/// well-formedness, issuing any diagnostics required. Returns true 5262/// on error. 5263bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5264 CXXRecordDecl *RD = Destructor->getParent(); 5265 5266 if (Destructor->isVirtual()) { 5267 SourceLocation Loc; 5268 5269 if (!Destructor->isImplicit()) 5270 Loc = Destructor->getLocation(); 5271 else 5272 Loc = RD->getLocation(); 5273 5274 // If we have a virtual destructor, look up the deallocation function 5275 FunctionDecl *OperatorDelete = 0; 5276 DeclarationName Name = 5277 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5278 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5279 return true; 5280 5281 MarkDeclarationReferenced(Loc, OperatorDelete); 5282 5283 Destructor->setOperatorDelete(OperatorDelete); 5284 } 5285 5286 return false; 5287} 5288 5289static inline bool 5290FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5291 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5292 FTI.ArgInfo[0].Param && 5293 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5294} 5295 5296/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5297/// the well-formednes of the destructor declarator @p D with type @p 5298/// R. If there are any errors in the declarator, this routine will 5299/// emit diagnostics and set the declarator to invalid. Even if this happens, 5300/// will be updated to reflect a well-formed type for the destructor and 5301/// returned. 5302QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5303 StorageClass& SC) { 5304 // C++ [class.dtor]p1: 5305 // [...] A typedef-name that names a class is a class-name 5306 // (7.1.3); however, a typedef-name that names a class shall not 5307 // be used as the identifier in the declarator for a destructor 5308 // declaration. 5309 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5310 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5311 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5312 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5313 else if (const TemplateSpecializationType *TST = 5314 DeclaratorType->getAs<TemplateSpecializationType>()) 5315 if (TST->isTypeAlias()) 5316 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5317 << DeclaratorType << 1; 5318 5319 // C++ [class.dtor]p2: 5320 // A destructor is used to destroy objects of its class type. A 5321 // destructor takes no parameters, and no return type can be 5322 // specified for it (not even void). The address of a destructor 5323 // shall not be taken. A destructor shall not be static. A 5324 // destructor can be invoked for a const, volatile or const 5325 // volatile object. A destructor shall not be declared const, 5326 // volatile or const volatile (9.3.2). 5327 if (SC == SC_Static) { 5328 if (!D.isInvalidType()) 5329 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5330 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5331 << SourceRange(D.getIdentifierLoc()) 5332 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5333 5334 SC = SC_None; 5335 } 5336 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5337 // Destructors don't have return types, but the parser will 5338 // happily parse something like: 5339 // 5340 // class X { 5341 // float ~X(); 5342 // }; 5343 // 5344 // The return type will be eliminated later. 5345 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5346 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5347 << SourceRange(D.getIdentifierLoc()); 5348 } 5349 5350 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5351 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5352 if (FTI.TypeQuals & Qualifiers::Const) 5353 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5354 << "const" << SourceRange(D.getIdentifierLoc()); 5355 if (FTI.TypeQuals & Qualifiers::Volatile) 5356 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5357 << "volatile" << SourceRange(D.getIdentifierLoc()); 5358 if (FTI.TypeQuals & Qualifiers::Restrict) 5359 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5360 << "restrict" << SourceRange(D.getIdentifierLoc()); 5361 D.setInvalidType(); 5362 } 5363 5364 // C++0x [class.dtor]p2: 5365 // A destructor shall not be declared with a ref-qualifier. 5366 if (FTI.hasRefQualifier()) { 5367 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5368 << FTI.RefQualifierIsLValueRef 5369 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5370 D.setInvalidType(); 5371 } 5372 5373 // Make sure we don't have any parameters. 5374 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5375 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5376 5377 // Delete the parameters. 5378 FTI.freeArgs(); 5379 D.setInvalidType(); 5380 } 5381 5382 // Make sure the destructor isn't variadic. 5383 if (FTI.isVariadic) { 5384 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5385 D.setInvalidType(); 5386 } 5387 5388 // Rebuild the function type "R" without any type qualifiers or 5389 // parameters (in case any of the errors above fired) and with 5390 // "void" as the return type, since destructors don't have return 5391 // types. 5392 if (!D.isInvalidType()) 5393 return R; 5394 5395 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5396 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5397 EPI.Variadic = false; 5398 EPI.TypeQuals = 0; 5399 EPI.RefQualifier = RQ_None; 5400 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5401} 5402 5403/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5404/// well-formednes of the conversion function declarator @p D with 5405/// type @p R. If there are any errors in the declarator, this routine 5406/// will emit diagnostics and return true. Otherwise, it will return 5407/// false. Either way, the type @p R will be updated to reflect a 5408/// well-formed type for the conversion operator. 5409void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5410 StorageClass& SC) { 5411 // C++ [class.conv.fct]p1: 5412 // Neither parameter types nor return type can be specified. The 5413 // type of a conversion function (8.3.5) is "function taking no 5414 // parameter returning conversion-type-id." 5415 if (SC == SC_Static) { 5416 if (!D.isInvalidType()) 5417 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5418 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5419 << SourceRange(D.getIdentifierLoc()); 5420 D.setInvalidType(); 5421 SC = SC_None; 5422 } 5423 5424 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5425 5426 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5427 // Conversion functions don't have return types, but the parser will 5428 // happily parse something like: 5429 // 5430 // class X { 5431 // float operator bool(); 5432 // }; 5433 // 5434 // The return type will be changed later anyway. 5435 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5436 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5437 << SourceRange(D.getIdentifierLoc()); 5438 D.setInvalidType(); 5439 } 5440 5441 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5442 5443 // Make sure we don't have any parameters. 5444 if (Proto->getNumArgs() > 0) { 5445 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5446 5447 // Delete the parameters. 5448 D.getFunctionTypeInfo().freeArgs(); 5449 D.setInvalidType(); 5450 } else if (Proto->isVariadic()) { 5451 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5452 D.setInvalidType(); 5453 } 5454 5455 // Diagnose "&operator bool()" and other such nonsense. This 5456 // is actually a gcc extension which we don't support. 5457 if (Proto->getResultType() != ConvType) { 5458 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5459 << Proto->getResultType(); 5460 D.setInvalidType(); 5461 ConvType = Proto->getResultType(); 5462 } 5463 5464 // C++ [class.conv.fct]p4: 5465 // The conversion-type-id shall not represent a function type nor 5466 // an array type. 5467 if (ConvType->isArrayType()) { 5468 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5469 ConvType = Context.getPointerType(ConvType); 5470 D.setInvalidType(); 5471 } else if (ConvType->isFunctionType()) { 5472 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5473 ConvType = Context.getPointerType(ConvType); 5474 D.setInvalidType(); 5475 } 5476 5477 // Rebuild the function type "R" without any parameters (in case any 5478 // of the errors above fired) and with the conversion type as the 5479 // return type. 5480 if (D.isInvalidType()) 5481 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5482 5483 // C++0x explicit conversion operators. 5484 if (D.getDeclSpec().isExplicitSpecified()) 5485 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5486 getLangOptions().CPlusPlus0x ? 5487 diag::warn_cxx98_compat_explicit_conversion_functions : 5488 diag::ext_explicit_conversion_functions) 5489 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5490} 5491 5492/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5493/// the declaration of the given C++ conversion function. This routine 5494/// is responsible for recording the conversion function in the C++ 5495/// class, if possible. 5496Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5497 assert(Conversion && "Expected to receive a conversion function declaration"); 5498 5499 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5500 5501 // Make sure we aren't redeclaring the conversion function. 5502 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5503 5504 // C++ [class.conv.fct]p1: 5505 // [...] A conversion function is never used to convert a 5506 // (possibly cv-qualified) object to the (possibly cv-qualified) 5507 // same object type (or a reference to it), to a (possibly 5508 // cv-qualified) base class of that type (or a reference to it), 5509 // or to (possibly cv-qualified) void. 5510 // FIXME: Suppress this warning if the conversion function ends up being a 5511 // virtual function that overrides a virtual function in a base class. 5512 QualType ClassType 5513 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5514 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5515 ConvType = ConvTypeRef->getPointeeType(); 5516 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5517 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5518 /* Suppress diagnostics for instantiations. */; 5519 else if (ConvType->isRecordType()) { 5520 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5521 if (ConvType == ClassType) 5522 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5523 << ClassType; 5524 else if (IsDerivedFrom(ClassType, ConvType)) 5525 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5526 << ClassType << ConvType; 5527 } else if (ConvType->isVoidType()) { 5528 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5529 << ClassType << ConvType; 5530 } 5531 5532 if (FunctionTemplateDecl *ConversionTemplate 5533 = Conversion->getDescribedFunctionTemplate()) 5534 return ConversionTemplate; 5535 5536 return Conversion; 5537} 5538 5539//===----------------------------------------------------------------------===// 5540// Namespace Handling 5541//===----------------------------------------------------------------------===// 5542 5543 5544 5545/// ActOnStartNamespaceDef - This is called at the start of a namespace 5546/// definition. 5547Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5548 SourceLocation InlineLoc, 5549 SourceLocation NamespaceLoc, 5550 SourceLocation IdentLoc, 5551 IdentifierInfo *II, 5552 SourceLocation LBrace, 5553 AttributeList *AttrList) { 5554 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5555 // For anonymous namespace, take the location of the left brace. 5556 SourceLocation Loc = II ? IdentLoc : LBrace; 5557 bool IsInline = InlineLoc.isValid(); 5558 bool IsInvalid = false; 5559 bool IsStd = false; 5560 bool AddToKnown = false; 5561 Scope *DeclRegionScope = NamespcScope->getParent(); 5562 5563 NamespaceDecl *PrevNS = 0; 5564 if (II) { 5565 // C++ [namespace.def]p2: 5566 // The identifier in an original-namespace-definition shall not 5567 // have been previously defined in the declarative region in 5568 // which the original-namespace-definition appears. The 5569 // identifier in an original-namespace-definition is the name of 5570 // the namespace. Subsequently in that declarative region, it is 5571 // treated as an original-namespace-name. 5572 // 5573 // Since namespace names are unique in their scope, and we don't 5574 // look through using directives, just look for any ordinary names. 5575 5576 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5577 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5578 Decl::IDNS_Namespace; 5579 NamedDecl *PrevDecl = 0; 5580 for (DeclContext::lookup_result R 5581 = CurContext->getRedeclContext()->lookup(II); 5582 R.first != R.second; ++R.first) { 5583 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5584 PrevDecl = *R.first; 5585 break; 5586 } 5587 } 5588 5589 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5590 5591 if (PrevNS) { 5592 // This is an extended namespace definition. 5593 if (IsInline != PrevNS->isInline()) { 5594 // inline-ness must match 5595 if (PrevNS->isInline()) { 5596 // The user probably just forgot the 'inline', so suggest that it 5597 // be added back. 5598 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5599 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5600 } else { 5601 Diag(Loc, diag::err_inline_namespace_mismatch) 5602 << IsInline; 5603 } 5604 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5605 5606 IsInline = PrevNS->isInline(); 5607 } 5608 } else if (PrevDecl) { 5609 // This is an invalid name redefinition. 5610 Diag(Loc, diag::err_redefinition_different_kind) 5611 << II; 5612 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5613 IsInvalid = true; 5614 // Continue on to push Namespc as current DeclContext and return it. 5615 } else if (II->isStr("std") && 5616 CurContext->getRedeclContext()->isTranslationUnit()) { 5617 // This is the first "real" definition of the namespace "std", so update 5618 // our cache of the "std" namespace to point at this definition. 5619 PrevNS = getStdNamespace(); 5620 IsStd = true; 5621 AddToKnown = !IsInline; 5622 } else { 5623 // We've seen this namespace for the first time. 5624 AddToKnown = !IsInline; 5625 } 5626 } else { 5627 // Anonymous namespaces. 5628 5629 // Determine whether the parent already has an anonymous namespace. 5630 DeclContext *Parent = CurContext->getRedeclContext(); 5631 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5632 PrevNS = TU->getAnonymousNamespace(); 5633 } else { 5634 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5635 PrevNS = ND->getAnonymousNamespace(); 5636 } 5637 5638 if (PrevNS && IsInline != PrevNS->isInline()) { 5639 // inline-ness must match 5640 Diag(Loc, diag::err_inline_namespace_mismatch) 5641 << IsInline; 5642 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5643 5644 // Recover by ignoring the new namespace's inline status. 5645 IsInline = PrevNS->isInline(); 5646 } 5647 } 5648 5649 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5650 StartLoc, Loc, II, PrevNS); 5651 if (IsInvalid) 5652 Namespc->setInvalidDecl(); 5653 5654 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5655 5656 // FIXME: Should we be merging attributes? 5657 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5658 PushNamespaceVisibilityAttr(Attr); 5659 5660 if (IsStd) 5661 StdNamespace = Namespc; 5662 if (AddToKnown) 5663 KnownNamespaces[Namespc] = false; 5664 5665 if (II) { 5666 PushOnScopeChains(Namespc, DeclRegionScope); 5667 } else { 5668 // Link the anonymous namespace into its parent. 5669 DeclContext *Parent = CurContext->getRedeclContext(); 5670 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5671 TU->setAnonymousNamespace(Namespc); 5672 } else { 5673 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5674 } 5675 5676 CurContext->addDecl(Namespc); 5677 5678 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5679 // behaves as if it were replaced by 5680 // namespace unique { /* empty body */ } 5681 // using namespace unique; 5682 // namespace unique { namespace-body } 5683 // where all occurrences of 'unique' in a translation unit are 5684 // replaced by the same identifier and this identifier differs 5685 // from all other identifiers in the entire program. 5686 5687 // We just create the namespace with an empty name and then add an 5688 // implicit using declaration, just like the standard suggests. 5689 // 5690 // CodeGen enforces the "universally unique" aspect by giving all 5691 // declarations semantically contained within an anonymous 5692 // namespace internal linkage. 5693 5694 if (!PrevNS) { 5695 UsingDirectiveDecl* UD 5696 = UsingDirectiveDecl::Create(Context, CurContext, 5697 /* 'using' */ LBrace, 5698 /* 'namespace' */ SourceLocation(), 5699 /* qualifier */ NestedNameSpecifierLoc(), 5700 /* identifier */ SourceLocation(), 5701 Namespc, 5702 /* Ancestor */ CurContext); 5703 UD->setImplicit(); 5704 CurContext->addDecl(UD); 5705 } 5706 } 5707 5708 // Although we could have an invalid decl (i.e. the namespace name is a 5709 // redefinition), push it as current DeclContext and try to continue parsing. 5710 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5711 // for the namespace has the declarations that showed up in that particular 5712 // namespace definition. 5713 PushDeclContext(NamespcScope, Namespc); 5714 return Namespc; 5715} 5716 5717/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5718/// is a namespace alias, returns the namespace it points to. 5719static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5720 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5721 return AD->getNamespace(); 5722 return dyn_cast_or_null<NamespaceDecl>(D); 5723} 5724 5725/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5726/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5727void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5728 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5729 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5730 Namespc->setRBraceLoc(RBrace); 5731 PopDeclContext(); 5732 if (Namespc->hasAttr<VisibilityAttr>()) 5733 PopPragmaVisibility(); 5734} 5735 5736CXXRecordDecl *Sema::getStdBadAlloc() const { 5737 return cast_or_null<CXXRecordDecl>( 5738 StdBadAlloc.get(Context.getExternalSource())); 5739} 5740 5741NamespaceDecl *Sema::getStdNamespace() const { 5742 return cast_or_null<NamespaceDecl>( 5743 StdNamespace.get(Context.getExternalSource())); 5744} 5745 5746/// \brief Retrieve the special "std" namespace, which may require us to 5747/// implicitly define the namespace. 5748NamespaceDecl *Sema::getOrCreateStdNamespace() { 5749 if (!StdNamespace) { 5750 // The "std" namespace has not yet been defined, so build one implicitly. 5751 StdNamespace = NamespaceDecl::Create(Context, 5752 Context.getTranslationUnitDecl(), 5753 /*Inline=*/false, 5754 SourceLocation(), SourceLocation(), 5755 &PP.getIdentifierTable().get("std"), 5756 /*PrevDecl=*/0); 5757 getStdNamespace()->setImplicit(true); 5758 } 5759 5760 return getStdNamespace(); 5761} 5762 5763/// \brief Determine whether a using statement is in a context where it will be 5764/// apply in all contexts. 5765static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5766 switch (CurContext->getDeclKind()) { 5767 case Decl::TranslationUnit: 5768 return true; 5769 case Decl::LinkageSpec: 5770 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5771 default: 5772 return false; 5773 } 5774} 5775 5776namespace { 5777 5778// Callback to only accept typo corrections that are namespaces. 5779class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5780 public: 5781 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5782 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5783 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5784 } 5785 return false; 5786 } 5787}; 5788 5789} 5790 5791static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5792 CXXScopeSpec &SS, 5793 SourceLocation IdentLoc, 5794 IdentifierInfo *Ident) { 5795 NamespaceValidatorCCC Validator; 5796 R.clear(); 5797 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5798 R.getLookupKind(), Sc, &SS, 5799 &Validator)) { 5800 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5801 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5802 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5803 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5804 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5805 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5806 else 5807 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5808 << Ident << CorrectedQuotedStr 5809 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5810 5811 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5812 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5813 5814 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5815 R.addDecl(Corrected.getCorrectionDecl()); 5816 return true; 5817 } 5818 return false; 5819} 5820 5821Decl *Sema::ActOnUsingDirective(Scope *S, 5822 SourceLocation UsingLoc, 5823 SourceLocation NamespcLoc, 5824 CXXScopeSpec &SS, 5825 SourceLocation IdentLoc, 5826 IdentifierInfo *NamespcName, 5827 AttributeList *AttrList) { 5828 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5829 assert(NamespcName && "Invalid NamespcName."); 5830 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5831 5832 // This can only happen along a recovery path. 5833 while (S->getFlags() & Scope::TemplateParamScope) 5834 S = S->getParent(); 5835 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5836 5837 UsingDirectiveDecl *UDir = 0; 5838 NestedNameSpecifier *Qualifier = 0; 5839 if (SS.isSet()) 5840 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5841 5842 // Lookup namespace name. 5843 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5844 LookupParsedName(R, S, &SS); 5845 if (R.isAmbiguous()) 5846 return 0; 5847 5848 if (R.empty()) { 5849 R.clear(); 5850 // Allow "using namespace std;" or "using namespace ::std;" even if 5851 // "std" hasn't been defined yet, for GCC compatibility. 5852 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5853 NamespcName->isStr("std")) { 5854 Diag(IdentLoc, diag::ext_using_undefined_std); 5855 R.addDecl(getOrCreateStdNamespace()); 5856 R.resolveKind(); 5857 } 5858 // Otherwise, attempt typo correction. 5859 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5860 } 5861 5862 if (!R.empty()) { 5863 NamedDecl *Named = R.getFoundDecl(); 5864 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5865 && "expected namespace decl"); 5866 // C++ [namespace.udir]p1: 5867 // A using-directive specifies that the names in the nominated 5868 // namespace can be used in the scope in which the 5869 // using-directive appears after the using-directive. During 5870 // unqualified name lookup (3.4.1), the names appear as if they 5871 // were declared in the nearest enclosing namespace which 5872 // contains both the using-directive and the nominated 5873 // namespace. [Note: in this context, "contains" means "contains 5874 // directly or indirectly". ] 5875 5876 // Find enclosing context containing both using-directive and 5877 // nominated namespace. 5878 NamespaceDecl *NS = getNamespaceDecl(Named); 5879 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5880 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5881 CommonAncestor = CommonAncestor->getParent(); 5882 5883 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5884 SS.getWithLocInContext(Context), 5885 IdentLoc, Named, CommonAncestor); 5886 5887 if (IsUsingDirectiveInToplevelContext(CurContext) && 5888 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5889 Diag(IdentLoc, diag::warn_using_directive_in_header); 5890 } 5891 5892 PushUsingDirective(S, UDir); 5893 } else { 5894 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5895 } 5896 5897 // FIXME: We ignore attributes for now. 5898 return UDir; 5899} 5900 5901void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5902 // If scope has associated entity, then using directive is at namespace 5903 // or translation unit scope. We add UsingDirectiveDecls, into 5904 // it's lookup structure. 5905 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5906 Ctx->addDecl(UDir); 5907 else 5908 // Otherwise it is block-sope. using-directives will affect lookup 5909 // only to the end of scope. 5910 S->PushUsingDirective(UDir); 5911} 5912 5913 5914Decl *Sema::ActOnUsingDeclaration(Scope *S, 5915 AccessSpecifier AS, 5916 bool HasUsingKeyword, 5917 SourceLocation UsingLoc, 5918 CXXScopeSpec &SS, 5919 UnqualifiedId &Name, 5920 AttributeList *AttrList, 5921 bool IsTypeName, 5922 SourceLocation TypenameLoc) { 5923 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5924 5925 switch (Name.getKind()) { 5926 case UnqualifiedId::IK_ImplicitSelfParam: 5927 case UnqualifiedId::IK_Identifier: 5928 case UnqualifiedId::IK_OperatorFunctionId: 5929 case UnqualifiedId::IK_LiteralOperatorId: 5930 case UnqualifiedId::IK_ConversionFunctionId: 5931 break; 5932 5933 case UnqualifiedId::IK_ConstructorName: 5934 case UnqualifiedId::IK_ConstructorTemplateId: 5935 // C++0x inherited constructors. 5936 Diag(Name.getSourceRange().getBegin(), 5937 getLangOptions().CPlusPlus0x ? 5938 diag::warn_cxx98_compat_using_decl_constructor : 5939 diag::err_using_decl_constructor) 5940 << SS.getRange(); 5941 5942 if (getLangOptions().CPlusPlus0x) break; 5943 5944 return 0; 5945 5946 case UnqualifiedId::IK_DestructorName: 5947 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5948 << SS.getRange(); 5949 return 0; 5950 5951 case UnqualifiedId::IK_TemplateId: 5952 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5953 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5954 return 0; 5955 } 5956 5957 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5958 DeclarationName TargetName = TargetNameInfo.getName(); 5959 if (!TargetName) 5960 return 0; 5961 5962 // Warn about using declarations. 5963 // TODO: store that the declaration was written without 'using' and 5964 // talk about access decls instead of using decls in the 5965 // diagnostics. 5966 if (!HasUsingKeyword) { 5967 UsingLoc = Name.getSourceRange().getBegin(); 5968 5969 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5970 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5971 } 5972 5973 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5974 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5975 return 0; 5976 5977 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5978 TargetNameInfo, AttrList, 5979 /* IsInstantiation */ false, 5980 IsTypeName, TypenameLoc); 5981 if (UD) 5982 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5983 5984 return UD; 5985} 5986 5987/// \brief Determine whether a using declaration considers the given 5988/// declarations as "equivalent", e.g., if they are redeclarations of 5989/// the same entity or are both typedefs of the same type. 5990static bool 5991IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5992 bool &SuppressRedeclaration) { 5993 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5994 SuppressRedeclaration = false; 5995 return true; 5996 } 5997 5998 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5999 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6000 SuppressRedeclaration = true; 6001 return Context.hasSameType(TD1->getUnderlyingType(), 6002 TD2->getUnderlyingType()); 6003 } 6004 6005 return false; 6006} 6007 6008 6009/// Determines whether to create a using shadow decl for a particular 6010/// decl, given the set of decls existing prior to this using lookup. 6011bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6012 const LookupResult &Previous) { 6013 // Diagnose finding a decl which is not from a base class of the 6014 // current class. We do this now because there are cases where this 6015 // function will silently decide not to build a shadow decl, which 6016 // will pre-empt further diagnostics. 6017 // 6018 // We don't need to do this in C++0x because we do the check once on 6019 // the qualifier. 6020 // 6021 // FIXME: diagnose the following if we care enough: 6022 // struct A { int foo; }; 6023 // struct B : A { using A::foo; }; 6024 // template <class T> struct C : A {}; 6025 // template <class T> struct D : C<T> { using B::foo; } // <--- 6026 // This is invalid (during instantiation) in C++03 because B::foo 6027 // resolves to the using decl in B, which is not a base class of D<T>. 6028 // We can't diagnose it immediately because C<T> is an unknown 6029 // specialization. The UsingShadowDecl in D<T> then points directly 6030 // to A::foo, which will look well-formed when we instantiate. 6031 // The right solution is to not collapse the shadow-decl chain. 6032 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6033 DeclContext *OrigDC = Orig->getDeclContext(); 6034 6035 // Handle enums and anonymous structs. 6036 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6037 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6038 while (OrigRec->isAnonymousStructOrUnion()) 6039 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6040 6041 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6042 if (OrigDC == CurContext) { 6043 Diag(Using->getLocation(), 6044 diag::err_using_decl_nested_name_specifier_is_current_class) 6045 << Using->getQualifierLoc().getSourceRange(); 6046 Diag(Orig->getLocation(), diag::note_using_decl_target); 6047 return true; 6048 } 6049 6050 Diag(Using->getQualifierLoc().getBeginLoc(), 6051 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6052 << Using->getQualifier() 6053 << cast<CXXRecordDecl>(CurContext) 6054 << Using->getQualifierLoc().getSourceRange(); 6055 Diag(Orig->getLocation(), diag::note_using_decl_target); 6056 return true; 6057 } 6058 } 6059 6060 if (Previous.empty()) return false; 6061 6062 NamedDecl *Target = Orig; 6063 if (isa<UsingShadowDecl>(Target)) 6064 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6065 6066 // If the target happens to be one of the previous declarations, we 6067 // don't have a conflict. 6068 // 6069 // FIXME: but we might be increasing its access, in which case we 6070 // should redeclare it. 6071 NamedDecl *NonTag = 0, *Tag = 0; 6072 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6073 I != E; ++I) { 6074 NamedDecl *D = (*I)->getUnderlyingDecl(); 6075 bool Result; 6076 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6077 return Result; 6078 6079 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6080 } 6081 6082 if (Target->isFunctionOrFunctionTemplate()) { 6083 FunctionDecl *FD; 6084 if (isa<FunctionTemplateDecl>(Target)) 6085 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6086 else 6087 FD = cast<FunctionDecl>(Target); 6088 6089 NamedDecl *OldDecl = 0; 6090 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6091 case Ovl_Overload: 6092 return false; 6093 6094 case Ovl_NonFunction: 6095 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6096 break; 6097 6098 // We found a decl with the exact signature. 6099 case Ovl_Match: 6100 // If we're in a record, we want to hide the target, so we 6101 // return true (without a diagnostic) to tell the caller not to 6102 // build a shadow decl. 6103 if (CurContext->isRecord()) 6104 return true; 6105 6106 // If we're not in a record, this is an error. 6107 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6108 break; 6109 } 6110 6111 Diag(Target->getLocation(), diag::note_using_decl_target); 6112 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6113 return true; 6114 } 6115 6116 // Target is not a function. 6117 6118 if (isa<TagDecl>(Target)) { 6119 // No conflict between a tag and a non-tag. 6120 if (!Tag) return false; 6121 6122 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6123 Diag(Target->getLocation(), diag::note_using_decl_target); 6124 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6125 return true; 6126 } 6127 6128 // No conflict between a tag and a non-tag. 6129 if (!NonTag) return false; 6130 6131 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6132 Diag(Target->getLocation(), diag::note_using_decl_target); 6133 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6134 return true; 6135} 6136 6137/// Builds a shadow declaration corresponding to a 'using' declaration. 6138UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6139 UsingDecl *UD, 6140 NamedDecl *Orig) { 6141 6142 // If we resolved to another shadow declaration, just coalesce them. 6143 NamedDecl *Target = Orig; 6144 if (isa<UsingShadowDecl>(Target)) { 6145 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6146 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6147 } 6148 6149 UsingShadowDecl *Shadow 6150 = UsingShadowDecl::Create(Context, CurContext, 6151 UD->getLocation(), UD, Target); 6152 UD->addShadowDecl(Shadow); 6153 6154 Shadow->setAccess(UD->getAccess()); 6155 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6156 Shadow->setInvalidDecl(); 6157 6158 if (S) 6159 PushOnScopeChains(Shadow, S); 6160 else 6161 CurContext->addDecl(Shadow); 6162 6163 6164 return Shadow; 6165} 6166 6167/// Hides a using shadow declaration. This is required by the current 6168/// using-decl implementation when a resolvable using declaration in a 6169/// class is followed by a declaration which would hide or override 6170/// one or more of the using decl's targets; for example: 6171/// 6172/// struct Base { void foo(int); }; 6173/// struct Derived : Base { 6174/// using Base::foo; 6175/// void foo(int); 6176/// }; 6177/// 6178/// The governing language is C++03 [namespace.udecl]p12: 6179/// 6180/// When a using-declaration brings names from a base class into a 6181/// derived class scope, member functions in the derived class 6182/// override and/or hide member functions with the same name and 6183/// parameter types in a base class (rather than conflicting). 6184/// 6185/// There are two ways to implement this: 6186/// (1) optimistically create shadow decls when they're not hidden 6187/// by existing declarations, or 6188/// (2) don't create any shadow decls (or at least don't make them 6189/// visible) until we've fully parsed/instantiated the class. 6190/// The problem with (1) is that we might have to retroactively remove 6191/// a shadow decl, which requires several O(n) operations because the 6192/// decl structures are (very reasonably) not designed for removal. 6193/// (2) avoids this but is very fiddly and phase-dependent. 6194void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6195 if (Shadow->getDeclName().getNameKind() == 6196 DeclarationName::CXXConversionFunctionName) 6197 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6198 6199 // Remove it from the DeclContext... 6200 Shadow->getDeclContext()->removeDecl(Shadow); 6201 6202 // ...and the scope, if applicable... 6203 if (S) { 6204 S->RemoveDecl(Shadow); 6205 IdResolver.RemoveDecl(Shadow); 6206 } 6207 6208 // ...and the using decl. 6209 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6210 6211 // TODO: complain somehow if Shadow was used. It shouldn't 6212 // be possible for this to happen, because...? 6213} 6214 6215/// Builds a using declaration. 6216/// 6217/// \param IsInstantiation - Whether this call arises from an 6218/// instantiation of an unresolved using declaration. We treat 6219/// the lookup differently for these declarations. 6220NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6221 SourceLocation UsingLoc, 6222 CXXScopeSpec &SS, 6223 const DeclarationNameInfo &NameInfo, 6224 AttributeList *AttrList, 6225 bool IsInstantiation, 6226 bool IsTypeName, 6227 SourceLocation TypenameLoc) { 6228 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6229 SourceLocation IdentLoc = NameInfo.getLoc(); 6230 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6231 6232 // FIXME: We ignore attributes for now. 6233 6234 if (SS.isEmpty()) { 6235 Diag(IdentLoc, diag::err_using_requires_qualname); 6236 return 0; 6237 } 6238 6239 // Do the redeclaration lookup in the current scope. 6240 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6241 ForRedeclaration); 6242 Previous.setHideTags(false); 6243 if (S) { 6244 LookupName(Previous, S); 6245 6246 // It is really dumb that we have to do this. 6247 LookupResult::Filter F = Previous.makeFilter(); 6248 while (F.hasNext()) { 6249 NamedDecl *D = F.next(); 6250 if (!isDeclInScope(D, CurContext, S)) 6251 F.erase(); 6252 } 6253 F.done(); 6254 } else { 6255 assert(IsInstantiation && "no scope in non-instantiation"); 6256 assert(CurContext->isRecord() && "scope not record in instantiation"); 6257 LookupQualifiedName(Previous, CurContext); 6258 } 6259 6260 // Check for invalid redeclarations. 6261 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6262 return 0; 6263 6264 // Check for bad qualifiers. 6265 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6266 return 0; 6267 6268 DeclContext *LookupContext = computeDeclContext(SS); 6269 NamedDecl *D; 6270 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6271 if (!LookupContext) { 6272 if (IsTypeName) { 6273 // FIXME: not all declaration name kinds are legal here 6274 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6275 UsingLoc, TypenameLoc, 6276 QualifierLoc, 6277 IdentLoc, NameInfo.getName()); 6278 } else { 6279 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6280 QualifierLoc, NameInfo); 6281 } 6282 } else { 6283 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6284 NameInfo, IsTypeName); 6285 } 6286 D->setAccess(AS); 6287 CurContext->addDecl(D); 6288 6289 if (!LookupContext) return D; 6290 UsingDecl *UD = cast<UsingDecl>(D); 6291 6292 if (RequireCompleteDeclContext(SS, LookupContext)) { 6293 UD->setInvalidDecl(); 6294 return UD; 6295 } 6296 6297 // Constructor inheriting using decls get special treatment. 6298 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6299 if (CheckInheritedConstructorUsingDecl(UD)) 6300 UD->setInvalidDecl(); 6301 return UD; 6302 } 6303 6304 // Otherwise, look up the target name. 6305 6306 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6307 6308 // Unlike most lookups, we don't always want to hide tag 6309 // declarations: tag names are visible through the using declaration 6310 // even if hidden by ordinary names, *except* in a dependent context 6311 // where it's important for the sanity of two-phase lookup. 6312 if (!IsInstantiation) 6313 R.setHideTags(false); 6314 6315 LookupQualifiedName(R, LookupContext); 6316 6317 if (R.empty()) { 6318 Diag(IdentLoc, diag::err_no_member) 6319 << NameInfo.getName() << LookupContext << SS.getRange(); 6320 UD->setInvalidDecl(); 6321 return UD; 6322 } 6323 6324 if (R.isAmbiguous()) { 6325 UD->setInvalidDecl(); 6326 return UD; 6327 } 6328 6329 if (IsTypeName) { 6330 // If we asked for a typename and got a non-type decl, error out. 6331 if (!R.getAsSingle<TypeDecl>()) { 6332 Diag(IdentLoc, diag::err_using_typename_non_type); 6333 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6334 Diag((*I)->getUnderlyingDecl()->getLocation(), 6335 diag::note_using_decl_target); 6336 UD->setInvalidDecl(); 6337 return UD; 6338 } 6339 } else { 6340 // If we asked for a non-typename and we got a type, error out, 6341 // but only if this is an instantiation of an unresolved using 6342 // decl. Otherwise just silently find the type name. 6343 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6344 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6345 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6346 UD->setInvalidDecl(); 6347 return UD; 6348 } 6349 } 6350 6351 // C++0x N2914 [namespace.udecl]p6: 6352 // A using-declaration shall not name a namespace. 6353 if (R.getAsSingle<NamespaceDecl>()) { 6354 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6355 << SS.getRange(); 6356 UD->setInvalidDecl(); 6357 return UD; 6358 } 6359 6360 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6361 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6362 BuildUsingShadowDecl(S, UD, *I); 6363 } 6364 6365 return UD; 6366} 6367 6368/// Additional checks for a using declaration referring to a constructor name. 6369bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6370 if (UD->isTypeName()) { 6371 // FIXME: Cannot specify typename when specifying constructor 6372 return true; 6373 } 6374 6375 const Type *SourceType = UD->getQualifier()->getAsType(); 6376 assert(SourceType && 6377 "Using decl naming constructor doesn't have type in scope spec."); 6378 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6379 6380 // Check whether the named type is a direct base class. 6381 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6382 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6383 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6384 BaseIt != BaseE; ++BaseIt) { 6385 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6386 if (CanonicalSourceType == BaseType) 6387 break; 6388 } 6389 6390 if (BaseIt == BaseE) { 6391 // Did not find SourceType in the bases. 6392 Diag(UD->getUsingLocation(), 6393 diag::err_using_decl_constructor_not_in_direct_base) 6394 << UD->getNameInfo().getSourceRange() 6395 << QualType(SourceType, 0) << TargetClass; 6396 return true; 6397 } 6398 6399 BaseIt->setInheritConstructors(); 6400 6401 return false; 6402} 6403 6404/// Checks that the given using declaration is not an invalid 6405/// redeclaration. Note that this is checking only for the using decl 6406/// itself, not for any ill-formedness among the UsingShadowDecls. 6407bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6408 bool isTypeName, 6409 const CXXScopeSpec &SS, 6410 SourceLocation NameLoc, 6411 const LookupResult &Prev) { 6412 // C++03 [namespace.udecl]p8: 6413 // C++0x [namespace.udecl]p10: 6414 // A using-declaration is a declaration and can therefore be used 6415 // repeatedly where (and only where) multiple declarations are 6416 // allowed. 6417 // 6418 // That's in non-member contexts. 6419 if (!CurContext->getRedeclContext()->isRecord()) 6420 return false; 6421 6422 NestedNameSpecifier *Qual 6423 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6424 6425 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6426 NamedDecl *D = *I; 6427 6428 bool DTypename; 6429 NestedNameSpecifier *DQual; 6430 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6431 DTypename = UD->isTypeName(); 6432 DQual = UD->getQualifier(); 6433 } else if (UnresolvedUsingValueDecl *UD 6434 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6435 DTypename = false; 6436 DQual = UD->getQualifier(); 6437 } else if (UnresolvedUsingTypenameDecl *UD 6438 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6439 DTypename = true; 6440 DQual = UD->getQualifier(); 6441 } else continue; 6442 6443 // using decls differ if one says 'typename' and the other doesn't. 6444 // FIXME: non-dependent using decls? 6445 if (isTypeName != DTypename) continue; 6446 6447 // using decls differ if they name different scopes (but note that 6448 // template instantiation can cause this check to trigger when it 6449 // didn't before instantiation). 6450 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6451 Context.getCanonicalNestedNameSpecifier(DQual)) 6452 continue; 6453 6454 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6455 Diag(D->getLocation(), diag::note_using_decl) << 1; 6456 return true; 6457 } 6458 6459 return false; 6460} 6461 6462 6463/// Checks that the given nested-name qualifier used in a using decl 6464/// in the current context is appropriately related to the current 6465/// scope. If an error is found, diagnoses it and returns true. 6466bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6467 const CXXScopeSpec &SS, 6468 SourceLocation NameLoc) { 6469 DeclContext *NamedContext = computeDeclContext(SS); 6470 6471 if (!CurContext->isRecord()) { 6472 // C++03 [namespace.udecl]p3: 6473 // C++0x [namespace.udecl]p8: 6474 // A using-declaration for a class member shall be a member-declaration. 6475 6476 // If we weren't able to compute a valid scope, it must be a 6477 // dependent class scope. 6478 if (!NamedContext || NamedContext->isRecord()) { 6479 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6480 << SS.getRange(); 6481 return true; 6482 } 6483 6484 // Otherwise, everything is known to be fine. 6485 return false; 6486 } 6487 6488 // The current scope is a record. 6489 6490 // If the named context is dependent, we can't decide much. 6491 if (!NamedContext) { 6492 // FIXME: in C++0x, we can diagnose if we can prove that the 6493 // nested-name-specifier does not refer to a base class, which is 6494 // still possible in some cases. 6495 6496 // Otherwise we have to conservatively report that things might be 6497 // okay. 6498 return false; 6499 } 6500 6501 if (!NamedContext->isRecord()) { 6502 // Ideally this would point at the last name in the specifier, 6503 // but we don't have that level of source info. 6504 Diag(SS.getRange().getBegin(), 6505 diag::err_using_decl_nested_name_specifier_is_not_class) 6506 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6507 return true; 6508 } 6509 6510 if (!NamedContext->isDependentContext() && 6511 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6512 return true; 6513 6514 if (getLangOptions().CPlusPlus0x) { 6515 // C++0x [namespace.udecl]p3: 6516 // In a using-declaration used as a member-declaration, the 6517 // nested-name-specifier shall name a base class of the class 6518 // being defined. 6519 6520 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6521 cast<CXXRecordDecl>(NamedContext))) { 6522 if (CurContext == NamedContext) { 6523 Diag(NameLoc, 6524 diag::err_using_decl_nested_name_specifier_is_current_class) 6525 << SS.getRange(); 6526 return true; 6527 } 6528 6529 Diag(SS.getRange().getBegin(), 6530 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6531 << (NestedNameSpecifier*) SS.getScopeRep() 6532 << cast<CXXRecordDecl>(CurContext) 6533 << SS.getRange(); 6534 return true; 6535 } 6536 6537 return false; 6538 } 6539 6540 // C++03 [namespace.udecl]p4: 6541 // A using-declaration used as a member-declaration shall refer 6542 // to a member of a base class of the class being defined [etc.]. 6543 6544 // Salient point: SS doesn't have to name a base class as long as 6545 // lookup only finds members from base classes. Therefore we can 6546 // diagnose here only if we can prove that that can't happen, 6547 // i.e. if the class hierarchies provably don't intersect. 6548 6549 // TODO: it would be nice if "definitely valid" results were cached 6550 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6551 // need to be repeated. 6552 6553 struct UserData { 6554 llvm::DenseSet<const CXXRecordDecl*> Bases; 6555 6556 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6557 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6558 Data->Bases.insert(Base); 6559 return true; 6560 } 6561 6562 bool hasDependentBases(const CXXRecordDecl *Class) { 6563 return !Class->forallBases(collect, this); 6564 } 6565 6566 /// Returns true if the base is dependent or is one of the 6567 /// accumulated base classes. 6568 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6569 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6570 return !Data->Bases.count(Base); 6571 } 6572 6573 bool mightShareBases(const CXXRecordDecl *Class) { 6574 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6575 } 6576 }; 6577 6578 UserData Data; 6579 6580 // Returns false if we find a dependent base. 6581 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6582 return false; 6583 6584 // Returns false if the class has a dependent base or if it or one 6585 // of its bases is present in the base set of the current context. 6586 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6587 return false; 6588 6589 Diag(SS.getRange().getBegin(), 6590 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6591 << (NestedNameSpecifier*) SS.getScopeRep() 6592 << cast<CXXRecordDecl>(CurContext) 6593 << SS.getRange(); 6594 6595 return true; 6596} 6597 6598Decl *Sema::ActOnAliasDeclaration(Scope *S, 6599 AccessSpecifier AS, 6600 MultiTemplateParamsArg TemplateParamLists, 6601 SourceLocation UsingLoc, 6602 UnqualifiedId &Name, 6603 TypeResult Type) { 6604 // Skip up to the relevant declaration scope. 6605 while (S->getFlags() & Scope::TemplateParamScope) 6606 S = S->getParent(); 6607 assert((S->getFlags() & Scope::DeclScope) && 6608 "got alias-declaration outside of declaration scope"); 6609 6610 if (Type.isInvalid()) 6611 return 0; 6612 6613 bool Invalid = false; 6614 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6615 TypeSourceInfo *TInfo = 0; 6616 GetTypeFromParser(Type.get(), &TInfo); 6617 6618 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6619 return 0; 6620 6621 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6622 UPPC_DeclarationType)) { 6623 Invalid = true; 6624 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6625 TInfo->getTypeLoc().getBeginLoc()); 6626 } 6627 6628 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6629 LookupName(Previous, S); 6630 6631 // Warn about shadowing the name of a template parameter. 6632 if (Previous.isSingleResult() && 6633 Previous.getFoundDecl()->isTemplateParameter()) { 6634 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6635 Previous.clear(); 6636 } 6637 6638 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6639 "name in alias declaration must be an identifier"); 6640 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6641 Name.StartLocation, 6642 Name.Identifier, TInfo); 6643 6644 NewTD->setAccess(AS); 6645 6646 if (Invalid) 6647 NewTD->setInvalidDecl(); 6648 6649 CheckTypedefForVariablyModifiedType(S, NewTD); 6650 Invalid |= NewTD->isInvalidDecl(); 6651 6652 bool Redeclaration = false; 6653 6654 NamedDecl *NewND; 6655 if (TemplateParamLists.size()) { 6656 TypeAliasTemplateDecl *OldDecl = 0; 6657 TemplateParameterList *OldTemplateParams = 0; 6658 6659 if (TemplateParamLists.size() != 1) { 6660 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6661 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6662 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6663 } 6664 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6665 6666 // Only consider previous declarations in the same scope. 6667 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6668 /*ExplicitInstantiationOrSpecialization*/false); 6669 if (!Previous.empty()) { 6670 Redeclaration = true; 6671 6672 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6673 if (!OldDecl && !Invalid) { 6674 Diag(UsingLoc, diag::err_redefinition_different_kind) 6675 << Name.Identifier; 6676 6677 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6678 if (OldD->getLocation().isValid()) 6679 Diag(OldD->getLocation(), diag::note_previous_definition); 6680 6681 Invalid = true; 6682 } 6683 6684 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6685 if (TemplateParameterListsAreEqual(TemplateParams, 6686 OldDecl->getTemplateParameters(), 6687 /*Complain=*/true, 6688 TPL_TemplateMatch)) 6689 OldTemplateParams = OldDecl->getTemplateParameters(); 6690 else 6691 Invalid = true; 6692 6693 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6694 if (!Invalid && 6695 !Context.hasSameType(OldTD->getUnderlyingType(), 6696 NewTD->getUnderlyingType())) { 6697 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6698 // but we can't reasonably accept it. 6699 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6700 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6701 if (OldTD->getLocation().isValid()) 6702 Diag(OldTD->getLocation(), diag::note_previous_definition); 6703 Invalid = true; 6704 } 6705 } 6706 } 6707 6708 // Merge any previous default template arguments into our parameters, 6709 // and check the parameter list. 6710 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6711 TPC_TypeAliasTemplate)) 6712 return 0; 6713 6714 TypeAliasTemplateDecl *NewDecl = 6715 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6716 Name.Identifier, TemplateParams, 6717 NewTD); 6718 6719 NewDecl->setAccess(AS); 6720 6721 if (Invalid) 6722 NewDecl->setInvalidDecl(); 6723 else if (OldDecl) 6724 NewDecl->setPreviousDeclaration(OldDecl); 6725 6726 NewND = NewDecl; 6727 } else { 6728 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6729 NewND = NewTD; 6730 } 6731 6732 if (!Redeclaration) 6733 PushOnScopeChains(NewND, S); 6734 6735 return NewND; 6736} 6737 6738Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6739 SourceLocation NamespaceLoc, 6740 SourceLocation AliasLoc, 6741 IdentifierInfo *Alias, 6742 CXXScopeSpec &SS, 6743 SourceLocation IdentLoc, 6744 IdentifierInfo *Ident) { 6745 6746 // Lookup the namespace name. 6747 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6748 LookupParsedName(R, S, &SS); 6749 6750 // Check if we have a previous declaration with the same name. 6751 NamedDecl *PrevDecl 6752 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6753 ForRedeclaration); 6754 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6755 PrevDecl = 0; 6756 6757 if (PrevDecl) { 6758 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6759 // We already have an alias with the same name that points to the same 6760 // namespace, so don't create a new one. 6761 // FIXME: At some point, we'll want to create the (redundant) 6762 // declaration to maintain better source information. 6763 if (!R.isAmbiguous() && !R.empty() && 6764 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6765 return 0; 6766 } 6767 6768 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6769 diag::err_redefinition_different_kind; 6770 Diag(AliasLoc, DiagID) << Alias; 6771 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6772 return 0; 6773 } 6774 6775 if (R.isAmbiguous()) 6776 return 0; 6777 6778 if (R.empty()) { 6779 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6780 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6781 return 0; 6782 } 6783 } 6784 6785 NamespaceAliasDecl *AliasDecl = 6786 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6787 Alias, SS.getWithLocInContext(Context), 6788 IdentLoc, R.getFoundDecl()); 6789 6790 PushOnScopeChains(AliasDecl, S); 6791 return AliasDecl; 6792} 6793 6794namespace { 6795 /// \brief Scoped object used to handle the state changes required in Sema 6796 /// to implicitly define the body of a C++ member function; 6797 class ImplicitlyDefinedFunctionScope { 6798 Sema &S; 6799 Sema::ContextRAII SavedContext; 6800 6801 public: 6802 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6803 : S(S), SavedContext(S, Method) 6804 { 6805 S.PushFunctionScope(); 6806 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6807 } 6808 6809 ~ImplicitlyDefinedFunctionScope() { 6810 S.PopExpressionEvaluationContext(); 6811 S.PopFunctionScopeInfo(); 6812 } 6813 }; 6814} 6815 6816Sema::ImplicitExceptionSpecification 6817Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6818 // C++ [except.spec]p14: 6819 // An implicitly declared special member function (Clause 12) shall have an 6820 // exception-specification. [...] 6821 ImplicitExceptionSpecification ExceptSpec(Context); 6822 if (ClassDecl->isInvalidDecl()) 6823 return ExceptSpec; 6824 6825 // Direct base-class constructors. 6826 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6827 BEnd = ClassDecl->bases_end(); 6828 B != BEnd; ++B) { 6829 if (B->isVirtual()) // Handled below. 6830 continue; 6831 6832 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6833 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6834 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6835 // If this is a deleted function, add it anyway. This might be conformant 6836 // with the standard. This might not. I'm not sure. It might not matter. 6837 if (Constructor) 6838 ExceptSpec.CalledDecl(Constructor); 6839 } 6840 } 6841 6842 // Virtual base-class constructors. 6843 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6844 BEnd = ClassDecl->vbases_end(); 6845 B != BEnd; ++B) { 6846 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6847 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6848 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6849 // If this is a deleted function, add it anyway. This might be conformant 6850 // with the standard. This might not. I'm not sure. It might not matter. 6851 if (Constructor) 6852 ExceptSpec.CalledDecl(Constructor); 6853 } 6854 } 6855 6856 // Field constructors. 6857 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6858 FEnd = ClassDecl->field_end(); 6859 F != FEnd; ++F) { 6860 if (F->hasInClassInitializer()) { 6861 if (Expr *E = F->getInClassInitializer()) 6862 ExceptSpec.CalledExpr(E); 6863 else if (!F->isInvalidDecl()) 6864 ExceptSpec.SetDelayed(); 6865 } else if (const RecordType *RecordTy 6866 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6867 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6868 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6869 // If this is a deleted function, add it anyway. This might be conformant 6870 // with the standard. This might not. I'm not sure. It might not matter. 6871 // In particular, the problem is that this function never gets called. It 6872 // might just be ill-formed because this function attempts to refer to 6873 // a deleted function here. 6874 if (Constructor) 6875 ExceptSpec.CalledDecl(Constructor); 6876 } 6877 } 6878 6879 return ExceptSpec; 6880} 6881 6882CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6883 CXXRecordDecl *ClassDecl) { 6884 // C++ [class.ctor]p5: 6885 // A default constructor for a class X is a constructor of class X 6886 // that can be called without an argument. If there is no 6887 // user-declared constructor for class X, a default constructor is 6888 // implicitly declared. An implicitly-declared default constructor 6889 // is an inline public member of its class. 6890 assert(!ClassDecl->hasUserDeclaredConstructor() && 6891 "Should not build implicit default constructor!"); 6892 6893 ImplicitExceptionSpecification Spec = 6894 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6895 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6896 6897 // Create the actual constructor declaration. 6898 CanQualType ClassType 6899 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6900 SourceLocation ClassLoc = ClassDecl->getLocation(); 6901 DeclarationName Name 6902 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6903 DeclarationNameInfo NameInfo(Name, ClassLoc); 6904 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6905 Context, ClassDecl, ClassLoc, NameInfo, 6906 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6907 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6908 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6909 getLangOptions().CPlusPlus0x); 6910 DefaultCon->setAccess(AS_public); 6911 DefaultCon->setDefaulted(); 6912 DefaultCon->setImplicit(); 6913 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6914 6915 // Note that we have declared this constructor. 6916 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6917 6918 if (Scope *S = getScopeForContext(ClassDecl)) 6919 PushOnScopeChains(DefaultCon, S, false); 6920 ClassDecl->addDecl(DefaultCon); 6921 6922 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6923 DefaultCon->setDeletedAsWritten(); 6924 6925 return DefaultCon; 6926} 6927 6928void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6929 CXXConstructorDecl *Constructor) { 6930 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6931 !Constructor->doesThisDeclarationHaveABody() && 6932 !Constructor->isDeleted()) && 6933 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6934 6935 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6936 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6937 6938 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6939 DiagnosticErrorTrap Trap(Diags); 6940 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6941 Trap.hasErrorOccurred()) { 6942 Diag(CurrentLocation, diag::note_member_synthesized_at) 6943 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6944 Constructor->setInvalidDecl(); 6945 return; 6946 } 6947 6948 SourceLocation Loc = Constructor->getLocation(); 6949 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6950 6951 Constructor->setUsed(); 6952 MarkVTableUsed(CurrentLocation, ClassDecl); 6953 6954 if (ASTMutationListener *L = getASTMutationListener()) { 6955 L->CompletedImplicitDefinition(Constructor); 6956 } 6957} 6958 6959/// Get any existing defaulted default constructor for the given class. Do not 6960/// implicitly define one if it does not exist. 6961static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6962 CXXRecordDecl *D) { 6963 ASTContext &Context = Self.Context; 6964 QualType ClassType = Context.getTypeDeclType(D); 6965 DeclarationName ConstructorName 6966 = Context.DeclarationNames.getCXXConstructorName( 6967 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6968 6969 DeclContext::lookup_const_iterator Con, ConEnd; 6970 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6971 Con != ConEnd; ++Con) { 6972 // A function template cannot be defaulted. 6973 if (isa<FunctionTemplateDecl>(*Con)) 6974 continue; 6975 6976 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6977 if (Constructor->isDefaultConstructor()) 6978 return Constructor->isDefaulted() ? Constructor : 0; 6979 } 6980 return 0; 6981} 6982 6983void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6984 if (!D) return; 6985 AdjustDeclIfTemplate(D); 6986 6987 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6988 CXXConstructorDecl *CtorDecl 6989 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6990 6991 if (!CtorDecl) return; 6992 6993 // Compute the exception specification for the default constructor. 6994 const FunctionProtoType *CtorTy = 6995 CtorDecl->getType()->castAs<FunctionProtoType>(); 6996 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6997 ImplicitExceptionSpecification Spec = 6998 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6999 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7000 assert(EPI.ExceptionSpecType != EST_Delayed); 7001 7002 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7003 } 7004 7005 // If the default constructor is explicitly defaulted, checking the exception 7006 // specification is deferred until now. 7007 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7008 !ClassDecl->isDependentType()) 7009 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7010} 7011 7012void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7013 // We start with an initial pass over the base classes to collect those that 7014 // inherit constructors from. If there are none, we can forgo all further 7015 // processing. 7016 typedef SmallVector<const RecordType *, 4> BasesVector; 7017 BasesVector BasesToInheritFrom; 7018 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7019 BaseE = ClassDecl->bases_end(); 7020 BaseIt != BaseE; ++BaseIt) { 7021 if (BaseIt->getInheritConstructors()) { 7022 QualType Base = BaseIt->getType(); 7023 if (Base->isDependentType()) { 7024 // If we inherit constructors from anything that is dependent, just 7025 // abort processing altogether. We'll get another chance for the 7026 // instantiations. 7027 return; 7028 } 7029 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7030 } 7031 } 7032 if (BasesToInheritFrom.empty()) 7033 return; 7034 7035 // Now collect the constructors that we already have in the current class. 7036 // Those take precedence over inherited constructors. 7037 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7038 // unless there is a user-declared constructor with the same signature in 7039 // the class where the using-declaration appears. 7040 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7041 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7042 CtorE = ClassDecl->ctor_end(); 7043 CtorIt != CtorE; ++CtorIt) { 7044 ExistingConstructors.insert( 7045 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7046 } 7047 7048 Scope *S = getScopeForContext(ClassDecl); 7049 DeclarationName CreatedCtorName = 7050 Context.DeclarationNames.getCXXConstructorName( 7051 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7052 7053 // Now comes the true work. 7054 // First, we keep a map from constructor types to the base that introduced 7055 // them. Needed for finding conflicting constructors. We also keep the 7056 // actually inserted declarations in there, for pretty diagnostics. 7057 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7058 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7059 ConstructorToSourceMap InheritedConstructors; 7060 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7061 BaseE = BasesToInheritFrom.end(); 7062 BaseIt != BaseE; ++BaseIt) { 7063 const RecordType *Base = *BaseIt; 7064 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7065 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7066 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7067 CtorE = BaseDecl->ctor_end(); 7068 CtorIt != CtorE; ++CtorIt) { 7069 // Find the using declaration for inheriting this base's constructors. 7070 DeclarationName Name = 7071 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7072 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7073 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7074 SourceLocation UsingLoc = UD ? UD->getLocation() : 7075 ClassDecl->getLocation(); 7076 7077 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7078 // from the class X named in the using-declaration consists of actual 7079 // constructors and notional constructors that result from the 7080 // transformation of defaulted parameters as follows: 7081 // - all non-template default constructors of X, and 7082 // - for each non-template constructor of X that has at least one 7083 // parameter with a default argument, the set of constructors that 7084 // results from omitting any ellipsis parameter specification and 7085 // successively omitting parameters with a default argument from the 7086 // end of the parameter-type-list. 7087 CXXConstructorDecl *BaseCtor = *CtorIt; 7088 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7089 const FunctionProtoType *BaseCtorType = 7090 BaseCtor->getType()->getAs<FunctionProtoType>(); 7091 7092 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7093 maxParams = BaseCtor->getNumParams(); 7094 params <= maxParams; ++params) { 7095 // Skip default constructors. They're never inherited. 7096 if (params == 0) 7097 continue; 7098 // Skip copy and move constructors for the same reason. 7099 if (CanBeCopyOrMove && params == 1) 7100 continue; 7101 7102 // Build up a function type for this particular constructor. 7103 // FIXME: The working paper does not consider that the exception spec 7104 // for the inheriting constructor might be larger than that of the 7105 // source. This code doesn't yet, either. When it does, this code will 7106 // need to be delayed until after exception specifications and in-class 7107 // member initializers are attached. 7108 const Type *NewCtorType; 7109 if (params == maxParams) 7110 NewCtorType = BaseCtorType; 7111 else { 7112 SmallVector<QualType, 16> Args; 7113 for (unsigned i = 0; i < params; ++i) { 7114 Args.push_back(BaseCtorType->getArgType(i)); 7115 } 7116 FunctionProtoType::ExtProtoInfo ExtInfo = 7117 BaseCtorType->getExtProtoInfo(); 7118 ExtInfo.Variadic = false; 7119 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7120 Args.data(), params, ExtInfo) 7121 .getTypePtr(); 7122 } 7123 const Type *CanonicalNewCtorType = 7124 Context.getCanonicalType(NewCtorType); 7125 7126 // Now that we have the type, first check if the class already has a 7127 // constructor with this signature. 7128 if (ExistingConstructors.count(CanonicalNewCtorType)) 7129 continue; 7130 7131 // Then we check if we have already declared an inherited constructor 7132 // with this signature. 7133 std::pair<ConstructorToSourceMap::iterator, bool> result = 7134 InheritedConstructors.insert(std::make_pair( 7135 CanonicalNewCtorType, 7136 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7137 if (!result.second) { 7138 // Already in the map. If it came from a different class, that's an 7139 // error. Not if it's from the same. 7140 CanQualType PreviousBase = result.first->second.first; 7141 if (CanonicalBase != PreviousBase) { 7142 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7143 const CXXConstructorDecl *PrevBaseCtor = 7144 PrevCtor->getInheritedConstructor(); 7145 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7146 7147 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7148 Diag(BaseCtor->getLocation(), 7149 diag::note_using_decl_constructor_conflict_current_ctor); 7150 Diag(PrevBaseCtor->getLocation(), 7151 diag::note_using_decl_constructor_conflict_previous_ctor); 7152 Diag(PrevCtor->getLocation(), 7153 diag::note_using_decl_constructor_conflict_previous_using); 7154 } 7155 continue; 7156 } 7157 7158 // OK, we're there, now add the constructor. 7159 // C++0x [class.inhctor]p8: [...] that would be performed by a 7160 // user-written inline constructor [...] 7161 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7162 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7163 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7164 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7165 /*ImplicitlyDeclared=*/true, 7166 // FIXME: Due to a defect in the standard, we treat inherited 7167 // constructors as constexpr even if that makes them ill-formed. 7168 /*Constexpr=*/BaseCtor->isConstexpr()); 7169 NewCtor->setAccess(BaseCtor->getAccess()); 7170 7171 // Build up the parameter decls and add them. 7172 SmallVector<ParmVarDecl *, 16> ParamDecls; 7173 for (unsigned i = 0; i < params; ++i) { 7174 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7175 UsingLoc, UsingLoc, 7176 /*IdentifierInfo=*/0, 7177 BaseCtorType->getArgType(i), 7178 /*TInfo=*/0, SC_None, 7179 SC_None, /*DefaultArg=*/0)); 7180 } 7181 NewCtor->setParams(ParamDecls); 7182 NewCtor->setInheritedConstructor(BaseCtor); 7183 7184 PushOnScopeChains(NewCtor, S, false); 7185 ClassDecl->addDecl(NewCtor); 7186 result.first->second.second = NewCtor; 7187 } 7188 } 7189 } 7190} 7191 7192Sema::ImplicitExceptionSpecification 7193Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7194 // C++ [except.spec]p14: 7195 // An implicitly declared special member function (Clause 12) shall have 7196 // an exception-specification. 7197 ImplicitExceptionSpecification ExceptSpec(Context); 7198 if (ClassDecl->isInvalidDecl()) 7199 return ExceptSpec; 7200 7201 // Direct base-class destructors. 7202 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7203 BEnd = ClassDecl->bases_end(); 7204 B != BEnd; ++B) { 7205 if (B->isVirtual()) // Handled below. 7206 continue; 7207 7208 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7209 ExceptSpec.CalledDecl( 7210 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7211 } 7212 7213 // Virtual base-class destructors. 7214 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7215 BEnd = ClassDecl->vbases_end(); 7216 B != BEnd; ++B) { 7217 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7218 ExceptSpec.CalledDecl( 7219 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7220 } 7221 7222 // Field destructors. 7223 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7224 FEnd = ClassDecl->field_end(); 7225 F != FEnd; ++F) { 7226 if (const RecordType *RecordTy 7227 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7228 ExceptSpec.CalledDecl( 7229 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7230 } 7231 7232 return ExceptSpec; 7233} 7234 7235CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7236 // C++ [class.dtor]p2: 7237 // If a class has no user-declared destructor, a destructor is 7238 // declared implicitly. An implicitly-declared destructor is an 7239 // inline public member of its class. 7240 7241 ImplicitExceptionSpecification Spec = 7242 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7243 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7244 7245 // Create the actual destructor declaration. 7246 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7247 7248 CanQualType ClassType 7249 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7250 SourceLocation ClassLoc = ClassDecl->getLocation(); 7251 DeclarationName Name 7252 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7253 DeclarationNameInfo NameInfo(Name, ClassLoc); 7254 CXXDestructorDecl *Destructor 7255 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7256 /*isInline=*/true, 7257 /*isImplicitlyDeclared=*/true); 7258 Destructor->setAccess(AS_public); 7259 Destructor->setDefaulted(); 7260 Destructor->setImplicit(); 7261 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7262 7263 // Note that we have declared this destructor. 7264 ++ASTContext::NumImplicitDestructorsDeclared; 7265 7266 // Introduce this destructor into its scope. 7267 if (Scope *S = getScopeForContext(ClassDecl)) 7268 PushOnScopeChains(Destructor, S, false); 7269 ClassDecl->addDecl(Destructor); 7270 7271 // This could be uniqued if it ever proves significant. 7272 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7273 7274 if (ShouldDeleteDestructor(Destructor)) 7275 Destructor->setDeletedAsWritten(); 7276 7277 AddOverriddenMethods(ClassDecl, Destructor); 7278 7279 return Destructor; 7280} 7281 7282void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7283 CXXDestructorDecl *Destructor) { 7284 assert((Destructor->isDefaulted() && 7285 !Destructor->doesThisDeclarationHaveABody()) && 7286 "DefineImplicitDestructor - call it for implicit default dtor"); 7287 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7288 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7289 7290 if (Destructor->isInvalidDecl()) 7291 return; 7292 7293 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7294 7295 DiagnosticErrorTrap Trap(Diags); 7296 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7297 Destructor->getParent()); 7298 7299 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7300 Diag(CurrentLocation, diag::note_member_synthesized_at) 7301 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7302 7303 Destructor->setInvalidDecl(); 7304 return; 7305 } 7306 7307 SourceLocation Loc = Destructor->getLocation(); 7308 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7309 Destructor->setImplicitlyDefined(true); 7310 Destructor->setUsed(); 7311 MarkVTableUsed(CurrentLocation, ClassDecl); 7312 7313 if (ASTMutationListener *L = getASTMutationListener()) { 7314 L->CompletedImplicitDefinition(Destructor); 7315 } 7316} 7317 7318void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7319 CXXDestructorDecl *destructor) { 7320 // C++11 [class.dtor]p3: 7321 // A declaration of a destructor that does not have an exception- 7322 // specification is implicitly considered to have the same exception- 7323 // specification as an implicit declaration. 7324 const FunctionProtoType *dtorType = destructor->getType()-> 7325 getAs<FunctionProtoType>(); 7326 if (dtorType->hasExceptionSpec()) 7327 return; 7328 7329 ImplicitExceptionSpecification exceptSpec = 7330 ComputeDefaultedDtorExceptionSpec(classDecl); 7331 7332 // Replace the destructor's type, building off the existing one. Fortunately, 7333 // the only thing of interest in the destructor type is its extended info. 7334 // The return and arguments are fixed. 7335 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7336 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7337 epi.NumExceptions = exceptSpec.size(); 7338 epi.Exceptions = exceptSpec.data(); 7339 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7340 7341 destructor->setType(ty); 7342 7343 // FIXME: If the destructor has a body that could throw, and the newly created 7344 // spec doesn't allow exceptions, we should emit a warning, because this 7345 // change in behavior can break conforming C++03 programs at runtime. 7346 // However, we don't have a body yet, so it needs to be done somewhere else. 7347} 7348 7349/// \brief Builds a statement that copies/moves the given entity from \p From to 7350/// \c To. 7351/// 7352/// This routine is used to copy/move the members of a class with an 7353/// implicitly-declared copy/move assignment operator. When the entities being 7354/// copied are arrays, this routine builds for loops to copy them. 7355/// 7356/// \param S The Sema object used for type-checking. 7357/// 7358/// \param Loc The location where the implicit copy/move is being generated. 7359/// 7360/// \param T The type of the expressions being copied/moved. Both expressions 7361/// must have this type. 7362/// 7363/// \param To The expression we are copying/moving to. 7364/// 7365/// \param From The expression we are copying/moving from. 7366/// 7367/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7368/// Otherwise, it's a non-static member subobject. 7369/// 7370/// \param Copying Whether we're copying or moving. 7371/// 7372/// \param Depth Internal parameter recording the depth of the recursion. 7373/// 7374/// \returns A statement or a loop that copies the expressions. 7375static StmtResult 7376BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7377 Expr *To, Expr *From, 7378 bool CopyingBaseSubobject, bool Copying, 7379 unsigned Depth = 0) { 7380 // C++0x [class.copy]p28: 7381 // Each subobject is assigned in the manner appropriate to its type: 7382 // 7383 // - if the subobject is of class type, as if by a call to operator= with 7384 // the subobject as the object expression and the corresponding 7385 // subobject of x as a single function argument (as if by explicit 7386 // qualification; that is, ignoring any possible virtual overriding 7387 // functions in more derived classes); 7388 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7389 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7390 7391 // Look for operator=. 7392 DeclarationName Name 7393 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7394 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7395 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7396 7397 // Filter out any result that isn't a copy/move-assignment operator. 7398 LookupResult::Filter F = OpLookup.makeFilter(); 7399 while (F.hasNext()) { 7400 NamedDecl *D = F.next(); 7401 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7402 if (Copying ? Method->isCopyAssignmentOperator() : 7403 Method->isMoveAssignmentOperator()) 7404 continue; 7405 7406 F.erase(); 7407 } 7408 F.done(); 7409 7410 // Suppress the protected check (C++ [class.protected]) for each of the 7411 // assignment operators we found. This strange dance is required when 7412 // we're assigning via a base classes's copy-assignment operator. To 7413 // ensure that we're getting the right base class subobject (without 7414 // ambiguities), we need to cast "this" to that subobject type; to 7415 // ensure that we don't go through the virtual call mechanism, we need 7416 // to qualify the operator= name with the base class (see below). However, 7417 // this means that if the base class has a protected copy assignment 7418 // operator, the protected member access check will fail. So, we 7419 // rewrite "protected" access to "public" access in this case, since we 7420 // know by construction that we're calling from a derived class. 7421 if (CopyingBaseSubobject) { 7422 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7423 L != LEnd; ++L) { 7424 if (L.getAccess() == AS_protected) 7425 L.setAccess(AS_public); 7426 } 7427 } 7428 7429 // Create the nested-name-specifier that will be used to qualify the 7430 // reference to operator=; this is required to suppress the virtual 7431 // call mechanism. 7432 CXXScopeSpec SS; 7433 SS.MakeTrivial(S.Context, 7434 NestedNameSpecifier::Create(S.Context, 0, false, 7435 T.getTypePtr()), 7436 Loc); 7437 7438 // Create the reference to operator=. 7439 ExprResult OpEqualRef 7440 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7441 /*FirstQualifierInScope=*/0, OpLookup, 7442 /*TemplateArgs=*/0, 7443 /*SuppressQualifierCheck=*/true); 7444 if (OpEqualRef.isInvalid()) 7445 return StmtError(); 7446 7447 // Build the call to the assignment operator. 7448 7449 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7450 OpEqualRef.takeAs<Expr>(), 7451 Loc, &From, 1, Loc); 7452 if (Call.isInvalid()) 7453 return StmtError(); 7454 7455 return S.Owned(Call.takeAs<Stmt>()); 7456 } 7457 7458 // - if the subobject is of scalar type, the built-in assignment 7459 // operator is used. 7460 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7461 if (!ArrayTy) { 7462 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7463 if (Assignment.isInvalid()) 7464 return StmtError(); 7465 7466 return S.Owned(Assignment.takeAs<Stmt>()); 7467 } 7468 7469 // - if the subobject is an array, each element is assigned, in the 7470 // manner appropriate to the element type; 7471 7472 // Construct a loop over the array bounds, e.g., 7473 // 7474 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7475 // 7476 // that will copy each of the array elements. 7477 QualType SizeType = S.Context.getSizeType(); 7478 7479 // Create the iteration variable. 7480 IdentifierInfo *IterationVarName = 0; 7481 { 7482 llvm::SmallString<8> Str; 7483 llvm::raw_svector_ostream OS(Str); 7484 OS << "__i" << Depth; 7485 IterationVarName = &S.Context.Idents.get(OS.str()); 7486 } 7487 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7488 IterationVarName, SizeType, 7489 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7490 SC_None, SC_None); 7491 7492 // Initialize the iteration variable to zero. 7493 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7494 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7495 7496 // Create a reference to the iteration variable; we'll use this several 7497 // times throughout. 7498 Expr *IterationVarRef 7499 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7500 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7501 7502 // Create the DeclStmt that holds the iteration variable. 7503 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7504 7505 // Create the comparison against the array bound. 7506 llvm::APInt Upper 7507 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7508 Expr *Comparison 7509 = new (S.Context) BinaryOperator(IterationVarRef, 7510 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7511 BO_NE, S.Context.BoolTy, 7512 VK_RValue, OK_Ordinary, Loc); 7513 7514 // Create the pre-increment of the iteration variable. 7515 Expr *Increment 7516 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7517 VK_LValue, OK_Ordinary, Loc); 7518 7519 // Subscript the "from" and "to" expressions with the iteration variable. 7520 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7521 IterationVarRef, Loc)); 7522 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7523 IterationVarRef, Loc)); 7524 if (!Copying) // Cast to rvalue 7525 From = CastForMoving(S, From); 7526 7527 // Build the copy/move for an individual element of the array. 7528 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7529 To, From, CopyingBaseSubobject, 7530 Copying, Depth + 1); 7531 if (Copy.isInvalid()) 7532 return StmtError(); 7533 7534 // Construct the loop that copies all elements of this array. 7535 return S.ActOnForStmt(Loc, Loc, InitStmt, 7536 S.MakeFullExpr(Comparison), 7537 0, S.MakeFullExpr(Increment), 7538 Loc, Copy.take()); 7539} 7540 7541std::pair<Sema::ImplicitExceptionSpecification, bool> 7542Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7543 CXXRecordDecl *ClassDecl) { 7544 if (ClassDecl->isInvalidDecl()) 7545 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7546 7547 // C++ [class.copy]p10: 7548 // If the class definition does not explicitly declare a copy 7549 // assignment operator, one is declared implicitly. 7550 // The implicitly-defined copy assignment operator for a class X 7551 // will have the form 7552 // 7553 // X& X::operator=(const X&) 7554 // 7555 // if 7556 bool HasConstCopyAssignment = true; 7557 7558 // -- each direct base class B of X has a copy assignment operator 7559 // whose parameter is of type const B&, const volatile B& or B, 7560 // and 7561 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7562 BaseEnd = ClassDecl->bases_end(); 7563 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7564 // We'll handle this below 7565 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7566 continue; 7567 7568 assert(!Base->getType()->isDependentType() && 7569 "Cannot generate implicit members for class with dependent bases."); 7570 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7571 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7572 &HasConstCopyAssignment); 7573 } 7574 7575 // In C++11, the above citation has "or virtual" added 7576 if (LangOpts.CPlusPlus0x) { 7577 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7578 BaseEnd = ClassDecl->vbases_end(); 7579 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7580 assert(!Base->getType()->isDependentType() && 7581 "Cannot generate implicit members for class with dependent bases."); 7582 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7583 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7584 &HasConstCopyAssignment); 7585 } 7586 } 7587 7588 // -- for all the nonstatic data members of X that are of a class 7589 // type M (or array thereof), each such class type has a copy 7590 // assignment operator whose parameter is of type const M&, 7591 // const volatile M& or M. 7592 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7593 FieldEnd = ClassDecl->field_end(); 7594 HasConstCopyAssignment && Field != FieldEnd; 7595 ++Field) { 7596 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7597 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7598 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7599 &HasConstCopyAssignment); 7600 } 7601 } 7602 7603 // Otherwise, the implicitly declared copy assignment operator will 7604 // have the form 7605 // 7606 // X& X::operator=(X&) 7607 7608 // C++ [except.spec]p14: 7609 // An implicitly declared special member function (Clause 12) shall have an 7610 // exception-specification. [...] 7611 7612 // It is unspecified whether or not an implicit copy assignment operator 7613 // attempts to deduplicate calls to assignment operators of virtual bases are 7614 // made. As such, this exception specification is effectively unspecified. 7615 // Based on a similar decision made for constness in C++0x, we're erring on 7616 // the side of assuming such calls to be made regardless of whether they 7617 // actually happen. 7618 ImplicitExceptionSpecification ExceptSpec(Context); 7619 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7620 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7621 BaseEnd = ClassDecl->bases_end(); 7622 Base != BaseEnd; ++Base) { 7623 if (Base->isVirtual()) 7624 continue; 7625 7626 CXXRecordDecl *BaseClassDecl 7627 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7628 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7629 ArgQuals, false, 0)) 7630 ExceptSpec.CalledDecl(CopyAssign); 7631 } 7632 7633 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7634 BaseEnd = ClassDecl->vbases_end(); 7635 Base != BaseEnd; ++Base) { 7636 CXXRecordDecl *BaseClassDecl 7637 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7638 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7639 ArgQuals, false, 0)) 7640 ExceptSpec.CalledDecl(CopyAssign); 7641 } 7642 7643 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7644 FieldEnd = ClassDecl->field_end(); 7645 Field != FieldEnd; 7646 ++Field) { 7647 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7648 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7649 if (CXXMethodDecl *CopyAssign = 7650 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7651 ExceptSpec.CalledDecl(CopyAssign); 7652 } 7653 } 7654 7655 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7656} 7657 7658CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7659 // Note: The following rules are largely analoguous to the copy 7660 // constructor rules. Note that virtual bases are not taken into account 7661 // for determining the argument type of the operator. Note also that 7662 // operators taking an object instead of a reference are allowed. 7663 7664 ImplicitExceptionSpecification Spec(Context); 7665 bool Const; 7666 llvm::tie(Spec, Const) = 7667 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7668 7669 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7670 QualType RetType = Context.getLValueReferenceType(ArgType); 7671 if (Const) 7672 ArgType = ArgType.withConst(); 7673 ArgType = Context.getLValueReferenceType(ArgType); 7674 7675 // An implicitly-declared copy assignment operator is an inline public 7676 // member of its class. 7677 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7678 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7679 SourceLocation ClassLoc = ClassDecl->getLocation(); 7680 DeclarationNameInfo NameInfo(Name, ClassLoc); 7681 CXXMethodDecl *CopyAssignment 7682 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7683 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7684 /*TInfo=*/0, /*isStatic=*/false, 7685 /*StorageClassAsWritten=*/SC_None, 7686 /*isInline=*/true, /*isConstexpr=*/false, 7687 SourceLocation()); 7688 CopyAssignment->setAccess(AS_public); 7689 CopyAssignment->setDefaulted(); 7690 CopyAssignment->setImplicit(); 7691 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7692 7693 // Add the parameter to the operator. 7694 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7695 ClassLoc, ClassLoc, /*Id=*/0, 7696 ArgType, /*TInfo=*/0, 7697 SC_None, 7698 SC_None, 0); 7699 CopyAssignment->setParams(FromParam); 7700 7701 // Note that we have added this copy-assignment operator. 7702 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7703 7704 if (Scope *S = getScopeForContext(ClassDecl)) 7705 PushOnScopeChains(CopyAssignment, S, false); 7706 ClassDecl->addDecl(CopyAssignment); 7707 7708 // C++0x [class.copy]p18: 7709 // ... If the class definition declares a move constructor or move 7710 // assignment operator, the implicitly declared copy assignment operator is 7711 // defined as deleted; ... 7712 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7713 ClassDecl->hasUserDeclaredMoveAssignment() || 7714 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7715 CopyAssignment->setDeletedAsWritten(); 7716 7717 AddOverriddenMethods(ClassDecl, CopyAssignment); 7718 return CopyAssignment; 7719} 7720 7721void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7722 CXXMethodDecl *CopyAssignOperator) { 7723 assert((CopyAssignOperator->isDefaulted() && 7724 CopyAssignOperator->isOverloadedOperator() && 7725 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7726 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7727 "DefineImplicitCopyAssignment called for wrong function"); 7728 7729 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7730 7731 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7732 CopyAssignOperator->setInvalidDecl(); 7733 return; 7734 } 7735 7736 CopyAssignOperator->setUsed(); 7737 7738 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7739 DiagnosticErrorTrap Trap(Diags); 7740 7741 // C++0x [class.copy]p30: 7742 // The implicitly-defined or explicitly-defaulted copy assignment operator 7743 // for a non-union class X performs memberwise copy assignment of its 7744 // subobjects. The direct base classes of X are assigned first, in the 7745 // order of their declaration in the base-specifier-list, and then the 7746 // immediate non-static data members of X are assigned, in the order in 7747 // which they were declared in the class definition. 7748 7749 // The statements that form the synthesized function body. 7750 ASTOwningVector<Stmt*> Statements(*this); 7751 7752 // The parameter for the "other" object, which we are copying from. 7753 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7754 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7755 QualType OtherRefType = Other->getType(); 7756 if (const LValueReferenceType *OtherRef 7757 = OtherRefType->getAs<LValueReferenceType>()) { 7758 OtherRefType = OtherRef->getPointeeType(); 7759 OtherQuals = OtherRefType.getQualifiers(); 7760 } 7761 7762 // Our location for everything implicitly-generated. 7763 SourceLocation Loc = CopyAssignOperator->getLocation(); 7764 7765 // Construct a reference to the "other" object. We'll be using this 7766 // throughout the generated ASTs. 7767 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7768 assert(OtherRef && "Reference to parameter cannot fail!"); 7769 7770 // Construct the "this" pointer. We'll be using this throughout the generated 7771 // ASTs. 7772 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7773 assert(This && "Reference to this cannot fail!"); 7774 7775 // Assign base classes. 7776 bool Invalid = false; 7777 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7778 E = ClassDecl->bases_end(); Base != E; ++Base) { 7779 // Form the assignment: 7780 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7781 QualType BaseType = Base->getType().getUnqualifiedType(); 7782 if (!BaseType->isRecordType()) { 7783 Invalid = true; 7784 continue; 7785 } 7786 7787 CXXCastPath BasePath; 7788 BasePath.push_back(Base); 7789 7790 // Construct the "from" expression, which is an implicit cast to the 7791 // appropriately-qualified base type. 7792 Expr *From = OtherRef; 7793 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7794 CK_UncheckedDerivedToBase, 7795 VK_LValue, &BasePath).take(); 7796 7797 // Dereference "this". 7798 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7799 7800 // Implicitly cast "this" to the appropriately-qualified base type. 7801 To = ImpCastExprToType(To.take(), 7802 Context.getCVRQualifiedType(BaseType, 7803 CopyAssignOperator->getTypeQualifiers()), 7804 CK_UncheckedDerivedToBase, 7805 VK_LValue, &BasePath); 7806 7807 // Build the copy. 7808 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7809 To.get(), From, 7810 /*CopyingBaseSubobject=*/true, 7811 /*Copying=*/true); 7812 if (Copy.isInvalid()) { 7813 Diag(CurrentLocation, diag::note_member_synthesized_at) 7814 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7815 CopyAssignOperator->setInvalidDecl(); 7816 return; 7817 } 7818 7819 // Success! Record the copy. 7820 Statements.push_back(Copy.takeAs<Expr>()); 7821 } 7822 7823 // \brief Reference to the __builtin_memcpy function. 7824 Expr *BuiltinMemCpyRef = 0; 7825 // \brief Reference to the __builtin_objc_memmove_collectable function. 7826 Expr *CollectableMemCpyRef = 0; 7827 7828 // Assign non-static members. 7829 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7830 FieldEnd = ClassDecl->field_end(); 7831 Field != FieldEnd; ++Field) { 7832 if (Field->isUnnamedBitfield()) 7833 continue; 7834 7835 // Check for members of reference type; we can't copy those. 7836 if (Field->getType()->isReferenceType()) { 7837 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7838 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7839 Diag(Field->getLocation(), diag::note_declared_at); 7840 Diag(CurrentLocation, diag::note_member_synthesized_at) 7841 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7842 Invalid = true; 7843 continue; 7844 } 7845 7846 // Check for members of const-qualified, non-class type. 7847 QualType BaseType = Context.getBaseElementType(Field->getType()); 7848 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7849 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7850 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7851 Diag(Field->getLocation(), diag::note_declared_at); 7852 Diag(CurrentLocation, diag::note_member_synthesized_at) 7853 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7854 Invalid = true; 7855 continue; 7856 } 7857 7858 // Suppress assigning zero-width bitfields. 7859 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7860 continue; 7861 7862 QualType FieldType = Field->getType().getNonReferenceType(); 7863 if (FieldType->isIncompleteArrayType()) { 7864 assert(ClassDecl->hasFlexibleArrayMember() && 7865 "Incomplete array type is not valid"); 7866 continue; 7867 } 7868 7869 // Build references to the field in the object we're copying from and to. 7870 CXXScopeSpec SS; // Intentionally empty 7871 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7872 LookupMemberName); 7873 MemberLookup.addDecl(*Field); 7874 MemberLookup.resolveKind(); 7875 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7876 Loc, /*IsArrow=*/false, 7877 SS, 0, MemberLookup, 0); 7878 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7879 Loc, /*IsArrow=*/true, 7880 SS, 0, MemberLookup, 0); 7881 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7882 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7883 7884 // If the field should be copied with __builtin_memcpy rather than via 7885 // explicit assignments, do so. This optimization only applies for arrays 7886 // of scalars and arrays of class type with trivial copy-assignment 7887 // operators. 7888 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7889 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7890 // Compute the size of the memory buffer to be copied. 7891 QualType SizeType = Context.getSizeType(); 7892 llvm::APInt Size(Context.getTypeSize(SizeType), 7893 Context.getTypeSizeInChars(BaseType).getQuantity()); 7894 for (const ConstantArrayType *Array 7895 = Context.getAsConstantArrayType(FieldType); 7896 Array; 7897 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7898 llvm::APInt ArraySize 7899 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7900 Size *= ArraySize; 7901 } 7902 7903 // Take the address of the field references for "from" and "to". 7904 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7905 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7906 7907 bool NeedsCollectableMemCpy = 7908 (BaseType->isRecordType() && 7909 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7910 7911 if (NeedsCollectableMemCpy) { 7912 if (!CollectableMemCpyRef) { 7913 // Create a reference to the __builtin_objc_memmove_collectable function. 7914 LookupResult R(*this, 7915 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7916 Loc, LookupOrdinaryName); 7917 LookupName(R, TUScope, true); 7918 7919 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7920 if (!CollectableMemCpy) { 7921 // Something went horribly wrong earlier, and we will have 7922 // complained about it. 7923 Invalid = true; 7924 continue; 7925 } 7926 7927 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7928 CollectableMemCpy->getType(), 7929 VK_LValue, Loc, 0).take(); 7930 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7931 } 7932 } 7933 // Create a reference to the __builtin_memcpy builtin function. 7934 else if (!BuiltinMemCpyRef) { 7935 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7936 LookupOrdinaryName); 7937 LookupName(R, TUScope, true); 7938 7939 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7940 if (!BuiltinMemCpy) { 7941 // Something went horribly wrong earlier, and we will have complained 7942 // about it. 7943 Invalid = true; 7944 continue; 7945 } 7946 7947 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7948 BuiltinMemCpy->getType(), 7949 VK_LValue, Loc, 0).take(); 7950 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7951 } 7952 7953 ASTOwningVector<Expr*> CallArgs(*this); 7954 CallArgs.push_back(To.takeAs<Expr>()); 7955 CallArgs.push_back(From.takeAs<Expr>()); 7956 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7957 ExprResult Call = ExprError(); 7958 if (NeedsCollectableMemCpy) 7959 Call = ActOnCallExpr(/*Scope=*/0, 7960 CollectableMemCpyRef, 7961 Loc, move_arg(CallArgs), 7962 Loc); 7963 else 7964 Call = ActOnCallExpr(/*Scope=*/0, 7965 BuiltinMemCpyRef, 7966 Loc, move_arg(CallArgs), 7967 Loc); 7968 7969 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7970 Statements.push_back(Call.takeAs<Expr>()); 7971 continue; 7972 } 7973 7974 // Build the copy of this field. 7975 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7976 To.get(), From.get(), 7977 /*CopyingBaseSubobject=*/false, 7978 /*Copying=*/true); 7979 if (Copy.isInvalid()) { 7980 Diag(CurrentLocation, diag::note_member_synthesized_at) 7981 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7982 CopyAssignOperator->setInvalidDecl(); 7983 return; 7984 } 7985 7986 // Success! Record the copy. 7987 Statements.push_back(Copy.takeAs<Stmt>()); 7988 } 7989 7990 if (!Invalid) { 7991 // Add a "return *this;" 7992 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7993 7994 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7995 if (Return.isInvalid()) 7996 Invalid = true; 7997 else { 7998 Statements.push_back(Return.takeAs<Stmt>()); 7999 8000 if (Trap.hasErrorOccurred()) { 8001 Diag(CurrentLocation, diag::note_member_synthesized_at) 8002 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8003 Invalid = true; 8004 } 8005 } 8006 } 8007 8008 if (Invalid) { 8009 CopyAssignOperator->setInvalidDecl(); 8010 return; 8011 } 8012 8013 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8014 /*isStmtExpr=*/false); 8015 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8016 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8017 8018 if (ASTMutationListener *L = getASTMutationListener()) { 8019 L->CompletedImplicitDefinition(CopyAssignOperator); 8020 } 8021} 8022 8023Sema::ImplicitExceptionSpecification 8024Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8025 ImplicitExceptionSpecification ExceptSpec(Context); 8026 8027 if (ClassDecl->isInvalidDecl()) 8028 return ExceptSpec; 8029 8030 // C++0x [except.spec]p14: 8031 // An implicitly declared special member function (Clause 12) shall have an 8032 // exception-specification. [...] 8033 8034 // It is unspecified whether or not an implicit move assignment operator 8035 // attempts to deduplicate calls to assignment operators of virtual bases are 8036 // made. As such, this exception specification is effectively unspecified. 8037 // Based on a similar decision made for constness in C++0x, we're erring on 8038 // the side of assuming such calls to be made regardless of whether they 8039 // actually happen. 8040 // Note that a move constructor is not implicitly declared when there are 8041 // virtual bases, but it can still be user-declared and explicitly defaulted. 8042 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8043 BaseEnd = ClassDecl->bases_end(); 8044 Base != BaseEnd; ++Base) { 8045 if (Base->isVirtual()) 8046 continue; 8047 8048 CXXRecordDecl *BaseClassDecl 8049 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8050 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8051 false, 0)) 8052 ExceptSpec.CalledDecl(MoveAssign); 8053 } 8054 8055 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8056 BaseEnd = ClassDecl->vbases_end(); 8057 Base != BaseEnd; ++Base) { 8058 CXXRecordDecl *BaseClassDecl 8059 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8060 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8061 false, 0)) 8062 ExceptSpec.CalledDecl(MoveAssign); 8063 } 8064 8065 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8066 FieldEnd = ClassDecl->field_end(); 8067 Field != FieldEnd; 8068 ++Field) { 8069 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8070 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8071 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8072 false, 0)) 8073 ExceptSpec.CalledDecl(MoveAssign); 8074 } 8075 } 8076 8077 return ExceptSpec; 8078} 8079 8080CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8081 // Note: The following rules are largely analoguous to the move 8082 // constructor rules. 8083 8084 ImplicitExceptionSpecification Spec( 8085 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8086 8087 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8088 QualType RetType = Context.getLValueReferenceType(ArgType); 8089 ArgType = Context.getRValueReferenceType(ArgType); 8090 8091 // An implicitly-declared move assignment operator is an inline public 8092 // member of its class. 8093 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8094 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8095 SourceLocation ClassLoc = ClassDecl->getLocation(); 8096 DeclarationNameInfo NameInfo(Name, ClassLoc); 8097 CXXMethodDecl *MoveAssignment 8098 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8099 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8100 /*TInfo=*/0, /*isStatic=*/false, 8101 /*StorageClassAsWritten=*/SC_None, 8102 /*isInline=*/true, 8103 /*isConstexpr=*/false, 8104 SourceLocation()); 8105 MoveAssignment->setAccess(AS_public); 8106 MoveAssignment->setDefaulted(); 8107 MoveAssignment->setImplicit(); 8108 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8109 8110 // Add the parameter to the operator. 8111 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8112 ClassLoc, ClassLoc, /*Id=*/0, 8113 ArgType, /*TInfo=*/0, 8114 SC_None, 8115 SC_None, 0); 8116 MoveAssignment->setParams(FromParam); 8117 8118 // Note that we have added this copy-assignment operator. 8119 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8120 8121 // C++0x [class.copy]p9: 8122 // If the definition of a class X does not explicitly declare a move 8123 // assignment operator, one will be implicitly declared as defaulted if and 8124 // only if: 8125 // [...] 8126 // - the move assignment operator would not be implicitly defined as 8127 // deleted. 8128 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8129 // Cache this result so that we don't try to generate this over and over 8130 // on every lookup, leaking memory and wasting time. 8131 ClassDecl->setFailedImplicitMoveAssignment(); 8132 return 0; 8133 } 8134 8135 if (Scope *S = getScopeForContext(ClassDecl)) 8136 PushOnScopeChains(MoveAssignment, S, false); 8137 ClassDecl->addDecl(MoveAssignment); 8138 8139 AddOverriddenMethods(ClassDecl, MoveAssignment); 8140 return MoveAssignment; 8141} 8142 8143void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8144 CXXMethodDecl *MoveAssignOperator) { 8145 assert((MoveAssignOperator->isDefaulted() && 8146 MoveAssignOperator->isOverloadedOperator() && 8147 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8148 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8149 "DefineImplicitMoveAssignment called for wrong function"); 8150 8151 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8152 8153 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8154 MoveAssignOperator->setInvalidDecl(); 8155 return; 8156 } 8157 8158 MoveAssignOperator->setUsed(); 8159 8160 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8161 DiagnosticErrorTrap Trap(Diags); 8162 8163 // C++0x [class.copy]p28: 8164 // The implicitly-defined or move assignment operator for a non-union class 8165 // X performs memberwise move assignment of its subobjects. The direct base 8166 // classes of X are assigned first, in the order of their declaration in the 8167 // base-specifier-list, and then the immediate non-static data members of X 8168 // are assigned, in the order in which they were declared in the class 8169 // definition. 8170 8171 // The statements that form the synthesized function body. 8172 ASTOwningVector<Stmt*> Statements(*this); 8173 8174 // The parameter for the "other" object, which we are move from. 8175 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8176 QualType OtherRefType = Other->getType()-> 8177 getAs<RValueReferenceType>()->getPointeeType(); 8178 assert(OtherRefType.getQualifiers() == 0 && 8179 "Bad argument type of defaulted move assignment"); 8180 8181 // Our location for everything implicitly-generated. 8182 SourceLocation Loc = MoveAssignOperator->getLocation(); 8183 8184 // Construct a reference to the "other" object. We'll be using this 8185 // throughout the generated ASTs. 8186 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8187 assert(OtherRef && "Reference to parameter cannot fail!"); 8188 // Cast to rvalue. 8189 OtherRef = CastForMoving(*this, OtherRef); 8190 8191 // Construct the "this" pointer. We'll be using this throughout the generated 8192 // ASTs. 8193 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8194 assert(This && "Reference to this cannot fail!"); 8195 8196 // Assign base classes. 8197 bool Invalid = false; 8198 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8199 E = ClassDecl->bases_end(); Base != E; ++Base) { 8200 // Form the assignment: 8201 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8202 QualType BaseType = Base->getType().getUnqualifiedType(); 8203 if (!BaseType->isRecordType()) { 8204 Invalid = true; 8205 continue; 8206 } 8207 8208 CXXCastPath BasePath; 8209 BasePath.push_back(Base); 8210 8211 // Construct the "from" expression, which is an implicit cast to the 8212 // appropriately-qualified base type. 8213 Expr *From = OtherRef; 8214 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8215 VK_XValue, &BasePath).take(); 8216 8217 // Dereference "this". 8218 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8219 8220 // Implicitly cast "this" to the appropriately-qualified base type. 8221 To = ImpCastExprToType(To.take(), 8222 Context.getCVRQualifiedType(BaseType, 8223 MoveAssignOperator->getTypeQualifiers()), 8224 CK_UncheckedDerivedToBase, 8225 VK_LValue, &BasePath); 8226 8227 // Build the move. 8228 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8229 To.get(), From, 8230 /*CopyingBaseSubobject=*/true, 8231 /*Copying=*/false); 8232 if (Move.isInvalid()) { 8233 Diag(CurrentLocation, diag::note_member_synthesized_at) 8234 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8235 MoveAssignOperator->setInvalidDecl(); 8236 return; 8237 } 8238 8239 // Success! Record the move. 8240 Statements.push_back(Move.takeAs<Expr>()); 8241 } 8242 8243 // \brief Reference to the __builtin_memcpy function. 8244 Expr *BuiltinMemCpyRef = 0; 8245 // \brief Reference to the __builtin_objc_memmove_collectable function. 8246 Expr *CollectableMemCpyRef = 0; 8247 8248 // Assign non-static members. 8249 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8250 FieldEnd = ClassDecl->field_end(); 8251 Field != FieldEnd; ++Field) { 8252 if (Field->isUnnamedBitfield()) 8253 continue; 8254 8255 // Check for members of reference type; we can't move those. 8256 if (Field->getType()->isReferenceType()) { 8257 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8258 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8259 Diag(Field->getLocation(), diag::note_declared_at); 8260 Diag(CurrentLocation, diag::note_member_synthesized_at) 8261 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8262 Invalid = true; 8263 continue; 8264 } 8265 8266 // Check for members of const-qualified, non-class type. 8267 QualType BaseType = Context.getBaseElementType(Field->getType()); 8268 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8269 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8270 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8271 Diag(Field->getLocation(), diag::note_declared_at); 8272 Diag(CurrentLocation, diag::note_member_synthesized_at) 8273 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8274 Invalid = true; 8275 continue; 8276 } 8277 8278 // Suppress assigning zero-width bitfields. 8279 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8280 continue; 8281 8282 QualType FieldType = Field->getType().getNonReferenceType(); 8283 if (FieldType->isIncompleteArrayType()) { 8284 assert(ClassDecl->hasFlexibleArrayMember() && 8285 "Incomplete array type is not valid"); 8286 continue; 8287 } 8288 8289 // Build references to the field in the object we're copying from and to. 8290 CXXScopeSpec SS; // Intentionally empty 8291 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8292 LookupMemberName); 8293 MemberLookup.addDecl(*Field); 8294 MemberLookup.resolveKind(); 8295 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8296 Loc, /*IsArrow=*/false, 8297 SS, 0, MemberLookup, 0); 8298 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8299 Loc, /*IsArrow=*/true, 8300 SS, 0, MemberLookup, 0); 8301 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8302 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8303 8304 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8305 "Member reference with rvalue base must be rvalue except for reference " 8306 "members, which aren't allowed for move assignment."); 8307 8308 // If the field should be copied with __builtin_memcpy rather than via 8309 // explicit assignments, do so. This optimization only applies for arrays 8310 // of scalars and arrays of class type with trivial move-assignment 8311 // operators. 8312 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8313 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8314 // Compute the size of the memory buffer to be copied. 8315 QualType SizeType = Context.getSizeType(); 8316 llvm::APInt Size(Context.getTypeSize(SizeType), 8317 Context.getTypeSizeInChars(BaseType).getQuantity()); 8318 for (const ConstantArrayType *Array 8319 = Context.getAsConstantArrayType(FieldType); 8320 Array; 8321 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8322 llvm::APInt ArraySize 8323 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8324 Size *= ArraySize; 8325 } 8326 8327 // Take the address of the field references for "from" and "to". We 8328 // directly construct UnaryOperators here because semantic analysis 8329 // does not permit us to take the address of an xvalue. 8330 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8331 Context.getPointerType(From.get()->getType()), 8332 VK_RValue, OK_Ordinary, Loc); 8333 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8334 Context.getPointerType(To.get()->getType()), 8335 VK_RValue, OK_Ordinary, Loc); 8336 8337 bool NeedsCollectableMemCpy = 8338 (BaseType->isRecordType() && 8339 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8340 8341 if (NeedsCollectableMemCpy) { 8342 if (!CollectableMemCpyRef) { 8343 // Create a reference to the __builtin_objc_memmove_collectable function. 8344 LookupResult R(*this, 8345 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8346 Loc, LookupOrdinaryName); 8347 LookupName(R, TUScope, true); 8348 8349 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8350 if (!CollectableMemCpy) { 8351 // Something went horribly wrong earlier, and we will have 8352 // complained about it. 8353 Invalid = true; 8354 continue; 8355 } 8356 8357 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8358 CollectableMemCpy->getType(), 8359 VK_LValue, Loc, 0).take(); 8360 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8361 } 8362 } 8363 // Create a reference to the __builtin_memcpy builtin function. 8364 else if (!BuiltinMemCpyRef) { 8365 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8366 LookupOrdinaryName); 8367 LookupName(R, TUScope, true); 8368 8369 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8370 if (!BuiltinMemCpy) { 8371 // Something went horribly wrong earlier, and we will have complained 8372 // about it. 8373 Invalid = true; 8374 continue; 8375 } 8376 8377 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8378 BuiltinMemCpy->getType(), 8379 VK_LValue, Loc, 0).take(); 8380 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8381 } 8382 8383 ASTOwningVector<Expr*> CallArgs(*this); 8384 CallArgs.push_back(To.takeAs<Expr>()); 8385 CallArgs.push_back(From.takeAs<Expr>()); 8386 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8387 ExprResult Call = ExprError(); 8388 if (NeedsCollectableMemCpy) 8389 Call = ActOnCallExpr(/*Scope=*/0, 8390 CollectableMemCpyRef, 8391 Loc, move_arg(CallArgs), 8392 Loc); 8393 else 8394 Call = ActOnCallExpr(/*Scope=*/0, 8395 BuiltinMemCpyRef, 8396 Loc, move_arg(CallArgs), 8397 Loc); 8398 8399 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8400 Statements.push_back(Call.takeAs<Expr>()); 8401 continue; 8402 } 8403 8404 // Build the move of this field. 8405 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8406 To.get(), From.get(), 8407 /*CopyingBaseSubobject=*/false, 8408 /*Copying=*/false); 8409 if (Move.isInvalid()) { 8410 Diag(CurrentLocation, diag::note_member_synthesized_at) 8411 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8412 MoveAssignOperator->setInvalidDecl(); 8413 return; 8414 } 8415 8416 // Success! Record the copy. 8417 Statements.push_back(Move.takeAs<Stmt>()); 8418 } 8419 8420 if (!Invalid) { 8421 // Add a "return *this;" 8422 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8423 8424 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8425 if (Return.isInvalid()) 8426 Invalid = true; 8427 else { 8428 Statements.push_back(Return.takeAs<Stmt>()); 8429 8430 if (Trap.hasErrorOccurred()) { 8431 Diag(CurrentLocation, diag::note_member_synthesized_at) 8432 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8433 Invalid = true; 8434 } 8435 } 8436 } 8437 8438 if (Invalid) { 8439 MoveAssignOperator->setInvalidDecl(); 8440 return; 8441 } 8442 8443 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8444 /*isStmtExpr=*/false); 8445 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8446 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8447 8448 if (ASTMutationListener *L = getASTMutationListener()) { 8449 L->CompletedImplicitDefinition(MoveAssignOperator); 8450 } 8451} 8452 8453std::pair<Sema::ImplicitExceptionSpecification, bool> 8454Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8455 if (ClassDecl->isInvalidDecl()) 8456 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8457 8458 // C++ [class.copy]p5: 8459 // The implicitly-declared copy constructor for a class X will 8460 // have the form 8461 // 8462 // X::X(const X&) 8463 // 8464 // if 8465 // FIXME: It ought to be possible to store this on the record. 8466 bool HasConstCopyConstructor = true; 8467 8468 // -- each direct or virtual base class B of X has a copy 8469 // constructor whose first parameter is of type const B& or 8470 // const volatile B&, and 8471 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8472 BaseEnd = ClassDecl->bases_end(); 8473 HasConstCopyConstructor && Base != BaseEnd; 8474 ++Base) { 8475 // Virtual bases are handled below. 8476 if (Base->isVirtual()) 8477 continue; 8478 8479 CXXRecordDecl *BaseClassDecl 8480 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8481 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8482 &HasConstCopyConstructor); 8483 } 8484 8485 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8486 BaseEnd = ClassDecl->vbases_end(); 8487 HasConstCopyConstructor && Base != BaseEnd; 8488 ++Base) { 8489 CXXRecordDecl *BaseClassDecl 8490 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8491 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8492 &HasConstCopyConstructor); 8493 } 8494 8495 // -- for all the nonstatic data members of X that are of a 8496 // class type M (or array thereof), each such class type 8497 // has a copy constructor whose first parameter is of type 8498 // const M& or const volatile M&. 8499 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8500 FieldEnd = ClassDecl->field_end(); 8501 HasConstCopyConstructor && Field != FieldEnd; 8502 ++Field) { 8503 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8504 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8505 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8506 &HasConstCopyConstructor); 8507 } 8508 } 8509 // Otherwise, the implicitly declared copy constructor will have 8510 // the form 8511 // 8512 // X::X(X&) 8513 8514 // C++ [except.spec]p14: 8515 // An implicitly declared special member function (Clause 12) shall have an 8516 // exception-specification. [...] 8517 ImplicitExceptionSpecification ExceptSpec(Context); 8518 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8519 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8520 BaseEnd = ClassDecl->bases_end(); 8521 Base != BaseEnd; 8522 ++Base) { 8523 // Virtual bases are handled below. 8524 if (Base->isVirtual()) 8525 continue; 8526 8527 CXXRecordDecl *BaseClassDecl 8528 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8529 if (CXXConstructorDecl *CopyConstructor = 8530 LookupCopyingConstructor(BaseClassDecl, Quals)) 8531 ExceptSpec.CalledDecl(CopyConstructor); 8532 } 8533 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8534 BaseEnd = ClassDecl->vbases_end(); 8535 Base != BaseEnd; 8536 ++Base) { 8537 CXXRecordDecl *BaseClassDecl 8538 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8539 if (CXXConstructorDecl *CopyConstructor = 8540 LookupCopyingConstructor(BaseClassDecl, Quals)) 8541 ExceptSpec.CalledDecl(CopyConstructor); 8542 } 8543 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8544 FieldEnd = ClassDecl->field_end(); 8545 Field != FieldEnd; 8546 ++Field) { 8547 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8548 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8549 if (CXXConstructorDecl *CopyConstructor = 8550 LookupCopyingConstructor(FieldClassDecl, Quals)) 8551 ExceptSpec.CalledDecl(CopyConstructor); 8552 } 8553 } 8554 8555 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8556} 8557 8558CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8559 CXXRecordDecl *ClassDecl) { 8560 // C++ [class.copy]p4: 8561 // If the class definition does not explicitly declare a copy 8562 // constructor, one is declared implicitly. 8563 8564 ImplicitExceptionSpecification Spec(Context); 8565 bool Const; 8566 llvm::tie(Spec, Const) = 8567 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8568 8569 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8570 QualType ArgType = ClassType; 8571 if (Const) 8572 ArgType = ArgType.withConst(); 8573 ArgType = Context.getLValueReferenceType(ArgType); 8574 8575 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8576 8577 DeclarationName Name 8578 = Context.DeclarationNames.getCXXConstructorName( 8579 Context.getCanonicalType(ClassType)); 8580 SourceLocation ClassLoc = ClassDecl->getLocation(); 8581 DeclarationNameInfo NameInfo(Name, ClassLoc); 8582 8583 // An implicitly-declared copy constructor is an inline public 8584 // member of its class. 8585 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8586 Context, ClassDecl, ClassLoc, NameInfo, 8587 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8588 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8589 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8590 getLangOptions().CPlusPlus0x); 8591 CopyConstructor->setAccess(AS_public); 8592 CopyConstructor->setDefaulted(); 8593 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8594 8595 // Note that we have declared this constructor. 8596 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8597 8598 // Add the parameter to the constructor. 8599 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8600 ClassLoc, ClassLoc, 8601 /*IdentifierInfo=*/0, 8602 ArgType, /*TInfo=*/0, 8603 SC_None, 8604 SC_None, 0); 8605 CopyConstructor->setParams(FromParam); 8606 8607 if (Scope *S = getScopeForContext(ClassDecl)) 8608 PushOnScopeChains(CopyConstructor, S, false); 8609 ClassDecl->addDecl(CopyConstructor); 8610 8611 // C++0x [class.copy]p7: 8612 // ... If the class definition declares a move constructor or move 8613 // assignment operator, the implicitly declared constructor is defined as 8614 // deleted; ... 8615 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8616 ClassDecl->hasUserDeclaredMoveAssignment() || 8617 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8618 CopyConstructor->setDeletedAsWritten(); 8619 8620 return CopyConstructor; 8621} 8622 8623void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8624 CXXConstructorDecl *CopyConstructor) { 8625 assert((CopyConstructor->isDefaulted() && 8626 CopyConstructor->isCopyConstructor() && 8627 !CopyConstructor->doesThisDeclarationHaveABody()) && 8628 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8629 8630 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8631 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8632 8633 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8634 DiagnosticErrorTrap Trap(Diags); 8635 8636 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8637 Trap.hasErrorOccurred()) { 8638 Diag(CurrentLocation, diag::note_member_synthesized_at) 8639 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8640 CopyConstructor->setInvalidDecl(); 8641 } else { 8642 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8643 CopyConstructor->getLocation(), 8644 MultiStmtArg(*this, 0, 0), 8645 /*isStmtExpr=*/false) 8646 .takeAs<Stmt>()); 8647 CopyConstructor->setImplicitlyDefined(true); 8648 } 8649 8650 CopyConstructor->setUsed(); 8651 if (ASTMutationListener *L = getASTMutationListener()) { 8652 L->CompletedImplicitDefinition(CopyConstructor); 8653 } 8654} 8655 8656Sema::ImplicitExceptionSpecification 8657Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8658 // C++ [except.spec]p14: 8659 // An implicitly declared special member function (Clause 12) shall have an 8660 // exception-specification. [...] 8661 ImplicitExceptionSpecification ExceptSpec(Context); 8662 if (ClassDecl->isInvalidDecl()) 8663 return ExceptSpec; 8664 8665 // Direct base-class constructors. 8666 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8667 BEnd = ClassDecl->bases_end(); 8668 B != BEnd; ++B) { 8669 if (B->isVirtual()) // Handled below. 8670 continue; 8671 8672 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8673 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8674 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8675 // If this is a deleted function, add it anyway. This might be conformant 8676 // with the standard. This might not. I'm not sure. It might not matter. 8677 if (Constructor) 8678 ExceptSpec.CalledDecl(Constructor); 8679 } 8680 } 8681 8682 // Virtual base-class constructors. 8683 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8684 BEnd = ClassDecl->vbases_end(); 8685 B != BEnd; ++B) { 8686 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8687 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8688 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8689 // If this is a deleted function, add it anyway. This might be conformant 8690 // with the standard. This might not. I'm not sure. It might not matter. 8691 if (Constructor) 8692 ExceptSpec.CalledDecl(Constructor); 8693 } 8694 } 8695 8696 // Field constructors. 8697 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8698 FEnd = ClassDecl->field_end(); 8699 F != FEnd; ++F) { 8700 if (const RecordType *RecordTy 8701 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8702 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8703 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8704 // If this is a deleted function, add it anyway. This might be conformant 8705 // with the standard. This might not. I'm not sure. It might not matter. 8706 // In particular, the problem is that this function never gets called. It 8707 // might just be ill-formed because this function attempts to refer to 8708 // a deleted function here. 8709 if (Constructor) 8710 ExceptSpec.CalledDecl(Constructor); 8711 } 8712 } 8713 8714 return ExceptSpec; 8715} 8716 8717CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8718 CXXRecordDecl *ClassDecl) { 8719 ImplicitExceptionSpecification Spec( 8720 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8721 8722 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8723 QualType ArgType = Context.getRValueReferenceType(ClassType); 8724 8725 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8726 8727 DeclarationName Name 8728 = Context.DeclarationNames.getCXXConstructorName( 8729 Context.getCanonicalType(ClassType)); 8730 SourceLocation ClassLoc = ClassDecl->getLocation(); 8731 DeclarationNameInfo NameInfo(Name, ClassLoc); 8732 8733 // C++0x [class.copy]p11: 8734 // An implicitly-declared copy/move constructor is an inline public 8735 // member of its class. 8736 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8737 Context, ClassDecl, ClassLoc, NameInfo, 8738 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8739 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8740 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8741 getLangOptions().CPlusPlus0x); 8742 MoveConstructor->setAccess(AS_public); 8743 MoveConstructor->setDefaulted(); 8744 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8745 8746 // Add the parameter to the constructor. 8747 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8748 ClassLoc, ClassLoc, 8749 /*IdentifierInfo=*/0, 8750 ArgType, /*TInfo=*/0, 8751 SC_None, 8752 SC_None, 0); 8753 MoveConstructor->setParams(FromParam); 8754 8755 // C++0x [class.copy]p9: 8756 // If the definition of a class X does not explicitly declare a move 8757 // constructor, one will be implicitly declared as defaulted if and only if: 8758 // [...] 8759 // - the move constructor would not be implicitly defined as deleted. 8760 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8761 // Cache this result so that we don't try to generate this over and over 8762 // on every lookup, leaking memory and wasting time. 8763 ClassDecl->setFailedImplicitMoveConstructor(); 8764 return 0; 8765 } 8766 8767 // Note that we have declared this constructor. 8768 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8769 8770 if (Scope *S = getScopeForContext(ClassDecl)) 8771 PushOnScopeChains(MoveConstructor, S, false); 8772 ClassDecl->addDecl(MoveConstructor); 8773 8774 return MoveConstructor; 8775} 8776 8777void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8778 CXXConstructorDecl *MoveConstructor) { 8779 assert((MoveConstructor->isDefaulted() && 8780 MoveConstructor->isMoveConstructor() && 8781 !MoveConstructor->doesThisDeclarationHaveABody()) && 8782 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8783 8784 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8785 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8786 8787 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8788 DiagnosticErrorTrap Trap(Diags); 8789 8790 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8791 Trap.hasErrorOccurred()) { 8792 Diag(CurrentLocation, diag::note_member_synthesized_at) 8793 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8794 MoveConstructor->setInvalidDecl(); 8795 } else { 8796 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8797 MoveConstructor->getLocation(), 8798 MultiStmtArg(*this, 0, 0), 8799 /*isStmtExpr=*/false) 8800 .takeAs<Stmt>()); 8801 MoveConstructor->setImplicitlyDefined(true); 8802 } 8803 8804 MoveConstructor->setUsed(); 8805 8806 if (ASTMutationListener *L = getASTMutationListener()) { 8807 L->CompletedImplicitDefinition(MoveConstructor); 8808 } 8809} 8810 8811ExprResult 8812Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8813 CXXConstructorDecl *Constructor, 8814 MultiExprArg ExprArgs, 8815 bool HadMultipleCandidates, 8816 bool RequiresZeroInit, 8817 unsigned ConstructKind, 8818 SourceRange ParenRange) { 8819 bool Elidable = false; 8820 8821 // C++0x [class.copy]p34: 8822 // When certain criteria are met, an implementation is allowed to 8823 // omit the copy/move construction of a class object, even if the 8824 // copy/move constructor and/or destructor for the object have 8825 // side effects. [...] 8826 // - when a temporary class object that has not been bound to a 8827 // reference (12.2) would be copied/moved to a class object 8828 // with the same cv-unqualified type, the copy/move operation 8829 // can be omitted by constructing the temporary object 8830 // directly into the target of the omitted copy/move 8831 if (ConstructKind == CXXConstructExpr::CK_Complete && 8832 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8833 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8834 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8835 } 8836 8837 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8838 Elidable, move(ExprArgs), HadMultipleCandidates, 8839 RequiresZeroInit, ConstructKind, ParenRange); 8840} 8841 8842/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8843/// including handling of its default argument expressions. 8844ExprResult 8845Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8846 CXXConstructorDecl *Constructor, bool Elidable, 8847 MultiExprArg ExprArgs, 8848 bool HadMultipleCandidates, 8849 bool RequiresZeroInit, 8850 unsigned ConstructKind, 8851 SourceRange ParenRange) { 8852 unsigned NumExprs = ExprArgs.size(); 8853 Expr **Exprs = (Expr **)ExprArgs.release(); 8854 8855 for (specific_attr_iterator<NonNullAttr> 8856 i = Constructor->specific_attr_begin<NonNullAttr>(), 8857 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8858 const NonNullAttr *NonNull = *i; 8859 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8860 } 8861 8862 MarkDeclarationReferenced(ConstructLoc, Constructor); 8863 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8864 Constructor, Elidable, Exprs, NumExprs, 8865 HadMultipleCandidates, RequiresZeroInit, 8866 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8867 ParenRange)); 8868} 8869 8870bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8871 CXXConstructorDecl *Constructor, 8872 MultiExprArg Exprs, 8873 bool HadMultipleCandidates) { 8874 // FIXME: Provide the correct paren SourceRange when available. 8875 ExprResult TempResult = 8876 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8877 move(Exprs), HadMultipleCandidates, false, 8878 CXXConstructExpr::CK_Complete, SourceRange()); 8879 if (TempResult.isInvalid()) 8880 return true; 8881 8882 Expr *Temp = TempResult.takeAs<Expr>(); 8883 CheckImplicitConversions(Temp, VD->getLocation()); 8884 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8885 Temp = MaybeCreateExprWithCleanups(Temp); 8886 VD->setInit(Temp); 8887 8888 return false; 8889} 8890 8891void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8892 if (VD->isInvalidDecl()) return; 8893 8894 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8895 if (ClassDecl->isInvalidDecl()) return; 8896 if (ClassDecl->hasTrivialDestructor()) return; 8897 if (ClassDecl->isDependentContext()) return; 8898 8899 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8900 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8901 CheckDestructorAccess(VD->getLocation(), Destructor, 8902 PDiag(diag::err_access_dtor_var) 8903 << VD->getDeclName() 8904 << VD->getType()); 8905 8906 if (!VD->hasGlobalStorage()) return; 8907 8908 // Emit warning for non-trivial dtor in global scope (a real global, 8909 // class-static, function-static). 8910 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8911 8912 // TODO: this should be re-enabled for static locals by !CXAAtExit 8913 if (!VD->isStaticLocal()) 8914 Diag(VD->getLocation(), diag::warn_global_destructor); 8915} 8916 8917/// AddCXXDirectInitializerToDecl - This action is called immediately after 8918/// ActOnDeclarator, when a C++ direct initializer is present. 8919/// e.g: "int x(1);" 8920void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8921 SourceLocation LParenLoc, 8922 MultiExprArg Exprs, 8923 SourceLocation RParenLoc, 8924 bool TypeMayContainAuto) { 8925 // If there is no declaration, there was an error parsing it. Just ignore 8926 // the initializer. 8927 if (RealDecl == 0) 8928 return; 8929 8930 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8931 if (!VDecl) { 8932 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8933 RealDecl->setInvalidDecl(); 8934 return; 8935 } 8936 8937 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8938 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8939 if (Exprs.size() == 0) { 8940 // It isn't possible to write this directly, but it is possible to 8941 // end up in this situation with "auto x(some_pack...);" 8942 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 8943 << VDecl->getDeclName() << VDecl->getType() 8944 << VDecl->getSourceRange(); 8945 RealDecl->setInvalidDecl(); 8946 return; 8947 } 8948 8949 if (Exprs.size() > 1) { 8950 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8951 diag::err_auto_var_init_multiple_expressions) 8952 << VDecl->getDeclName() << VDecl->getType() 8953 << VDecl->getSourceRange(); 8954 RealDecl->setInvalidDecl(); 8955 return; 8956 } 8957 8958 Expr *Init = Exprs.get()[0]; 8959 TypeSourceInfo *DeducedType = 0; 8960 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8961 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8962 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8963 << Init->getSourceRange(); 8964 if (!DeducedType) { 8965 RealDecl->setInvalidDecl(); 8966 return; 8967 } 8968 VDecl->setTypeSourceInfo(DeducedType); 8969 VDecl->setType(DeducedType->getType()); 8970 8971 // In ARC, infer lifetime. 8972 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8973 VDecl->setInvalidDecl(); 8974 8975 // If this is a redeclaration, check that the type we just deduced matches 8976 // the previously declared type. 8977 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8978 MergeVarDeclTypes(VDecl, Old); 8979 } 8980 8981 // We will represent direct-initialization similarly to copy-initialization: 8982 // int x(1); -as-> int x = 1; 8983 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8984 // 8985 // Clients that want to distinguish between the two forms, can check for 8986 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8987 // A major benefit is that clients that don't particularly care about which 8988 // exactly form was it (like the CodeGen) can handle both cases without 8989 // special case code. 8990 8991 // C++ 8.5p11: 8992 // The form of initialization (using parentheses or '=') is generally 8993 // insignificant, but does matter when the entity being initialized has a 8994 // class type. 8995 8996 if (!VDecl->getType()->isDependentType() && 8997 !VDecl->getType()->isIncompleteArrayType() && 8998 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8999 diag::err_typecheck_decl_incomplete_type)) { 9000 VDecl->setInvalidDecl(); 9001 return; 9002 } 9003 9004 // The variable can not have an abstract class type. 9005 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9006 diag::err_abstract_type_in_decl, 9007 AbstractVariableType)) 9008 VDecl->setInvalidDecl(); 9009 9010 const VarDecl *Def; 9011 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9012 Diag(VDecl->getLocation(), diag::err_redefinition) 9013 << VDecl->getDeclName(); 9014 Diag(Def->getLocation(), diag::note_previous_definition); 9015 VDecl->setInvalidDecl(); 9016 return; 9017 } 9018 9019 // C++ [class.static.data]p4 9020 // If a static data member is of const integral or const 9021 // enumeration type, its declaration in the class definition can 9022 // specify a constant-initializer which shall be an integral 9023 // constant expression (5.19). In that case, the member can appear 9024 // in integral constant expressions. The member shall still be 9025 // defined in a namespace scope if it is used in the program and the 9026 // namespace scope definition shall not contain an initializer. 9027 // 9028 // We already performed a redefinition check above, but for static 9029 // data members we also need to check whether there was an in-class 9030 // declaration with an initializer. 9031 const VarDecl* PrevInit = 0; 9032 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9033 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9034 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9035 return; 9036 } 9037 9038 bool IsDependent = false; 9039 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9040 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9041 VDecl->setInvalidDecl(); 9042 return; 9043 } 9044 9045 if (Exprs.get()[I]->isTypeDependent()) 9046 IsDependent = true; 9047 } 9048 9049 // If either the declaration has a dependent type or if any of the 9050 // expressions is type-dependent, we represent the initialization 9051 // via a ParenListExpr for later use during template instantiation. 9052 if (VDecl->getType()->isDependentType() || IsDependent) { 9053 // Let clients know that initialization was done with a direct initializer. 9054 VDecl->setCXXDirectInitializer(true); 9055 9056 // Store the initialization expressions as a ParenListExpr. 9057 unsigned NumExprs = Exprs.size(); 9058 VDecl->setInit(new (Context) ParenListExpr( 9059 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9060 VDecl->getType().getNonReferenceType())); 9061 return; 9062 } 9063 9064 // Capture the variable that is being initialized and the style of 9065 // initialization. 9066 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9067 9068 // FIXME: Poor source location information. 9069 InitializationKind Kind 9070 = InitializationKind::CreateDirect(VDecl->getLocation(), 9071 LParenLoc, RParenLoc); 9072 9073 QualType T = VDecl->getType(); 9074 InitializationSequence InitSeq(*this, Entity, Kind, 9075 Exprs.get(), Exprs.size()); 9076 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9077 if (Result.isInvalid()) { 9078 VDecl->setInvalidDecl(); 9079 return; 9080 } else if (T != VDecl->getType()) { 9081 VDecl->setType(T); 9082 Result.get()->setType(T); 9083 } 9084 9085 9086 Expr *Init = Result.get(); 9087 CheckImplicitConversions(Init, LParenLoc); 9088 9089 Init = MaybeCreateExprWithCleanups(Init); 9090 VDecl->setInit(Init); 9091 VDecl->setCXXDirectInitializer(true); 9092 9093 CheckCompleteVariableDeclaration(VDecl); 9094} 9095 9096/// \brief Given a constructor and the set of arguments provided for the 9097/// constructor, convert the arguments and add any required default arguments 9098/// to form a proper call to this constructor. 9099/// 9100/// \returns true if an error occurred, false otherwise. 9101bool 9102Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9103 MultiExprArg ArgsPtr, 9104 SourceLocation Loc, 9105 ASTOwningVector<Expr*> &ConvertedArgs) { 9106 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9107 unsigned NumArgs = ArgsPtr.size(); 9108 Expr **Args = (Expr **)ArgsPtr.get(); 9109 9110 const FunctionProtoType *Proto 9111 = Constructor->getType()->getAs<FunctionProtoType>(); 9112 assert(Proto && "Constructor without a prototype?"); 9113 unsigned NumArgsInProto = Proto->getNumArgs(); 9114 9115 // If too few arguments are available, we'll fill in the rest with defaults. 9116 if (NumArgs < NumArgsInProto) 9117 ConvertedArgs.reserve(NumArgsInProto); 9118 else 9119 ConvertedArgs.reserve(NumArgs); 9120 9121 VariadicCallType CallType = 9122 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9123 SmallVector<Expr *, 8> AllArgs; 9124 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9125 Proto, 0, Args, NumArgs, AllArgs, 9126 CallType); 9127 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9128 ConvertedArgs.push_back(AllArgs[i]); 9129 return Invalid; 9130} 9131 9132static inline bool 9133CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9134 const FunctionDecl *FnDecl) { 9135 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9136 if (isa<NamespaceDecl>(DC)) { 9137 return SemaRef.Diag(FnDecl->getLocation(), 9138 diag::err_operator_new_delete_declared_in_namespace) 9139 << FnDecl->getDeclName(); 9140 } 9141 9142 if (isa<TranslationUnitDecl>(DC) && 9143 FnDecl->getStorageClass() == SC_Static) { 9144 return SemaRef.Diag(FnDecl->getLocation(), 9145 diag::err_operator_new_delete_declared_static) 9146 << FnDecl->getDeclName(); 9147 } 9148 9149 return false; 9150} 9151 9152static inline bool 9153CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9154 CanQualType ExpectedResultType, 9155 CanQualType ExpectedFirstParamType, 9156 unsigned DependentParamTypeDiag, 9157 unsigned InvalidParamTypeDiag) { 9158 QualType ResultType = 9159 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9160 9161 // Check that the result type is not dependent. 9162 if (ResultType->isDependentType()) 9163 return SemaRef.Diag(FnDecl->getLocation(), 9164 diag::err_operator_new_delete_dependent_result_type) 9165 << FnDecl->getDeclName() << ExpectedResultType; 9166 9167 // Check that the result type is what we expect. 9168 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9169 return SemaRef.Diag(FnDecl->getLocation(), 9170 diag::err_operator_new_delete_invalid_result_type) 9171 << FnDecl->getDeclName() << ExpectedResultType; 9172 9173 // A function template must have at least 2 parameters. 9174 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9175 return SemaRef.Diag(FnDecl->getLocation(), 9176 diag::err_operator_new_delete_template_too_few_parameters) 9177 << FnDecl->getDeclName(); 9178 9179 // The function decl must have at least 1 parameter. 9180 if (FnDecl->getNumParams() == 0) 9181 return SemaRef.Diag(FnDecl->getLocation(), 9182 diag::err_operator_new_delete_too_few_parameters) 9183 << FnDecl->getDeclName(); 9184 9185 // Check the the first parameter type is not dependent. 9186 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9187 if (FirstParamType->isDependentType()) 9188 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9189 << FnDecl->getDeclName() << ExpectedFirstParamType; 9190 9191 // Check that the first parameter type is what we expect. 9192 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9193 ExpectedFirstParamType) 9194 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9195 << FnDecl->getDeclName() << ExpectedFirstParamType; 9196 9197 return false; 9198} 9199 9200static bool 9201CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9202 // C++ [basic.stc.dynamic.allocation]p1: 9203 // A program is ill-formed if an allocation function is declared in a 9204 // namespace scope other than global scope or declared static in global 9205 // scope. 9206 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9207 return true; 9208 9209 CanQualType SizeTy = 9210 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9211 9212 // C++ [basic.stc.dynamic.allocation]p1: 9213 // The return type shall be void*. The first parameter shall have type 9214 // std::size_t. 9215 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9216 SizeTy, 9217 diag::err_operator_new_dependent_param_type, 9218 diag::err_operator_new_param_type)) 9219 return true; 9220 9221 // C++ [basic.stc.dynamic.allocation]p1: 9222 // The first parameter shall not have an associated default argument. 9223 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9224 return SemaRef.Diag(FnDecl->getLocation(), 9225 diag::err_operator_new_default_arg) 9226 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9227 9228 return false; 9229} 9230 9231static bool 9232CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9233 // C++ [basic.stc.dynamic.deallocation]p1: 9234 // A program is ill-formed if deallocation functions are declared in a 9235 // namespace scope other than global scope or declared static in global 9236 // scope. 9237 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9238 return true; 9239 9240 // C++ [basic.stc.dynamic.deallocation]p2: 9241 // Each deallocation function shall return void and its first parameter 9242 // shall be void*. 9243 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9244 SemaRef.Context.VoidPtrTy, 9245 diag::err_operator_delete_dependent_param_type, 9246 diag::err_operator_delete_param_type)) 9247 return true; 9248 9249 return false; 9250} 9251 9252/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9253/// of this overloaded operator is well-formed. If so, returns false; 9254/// otherwise, emits appropriate diagnostics and returns true. 9255bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9256 assert(FnDecl && FnDecl->isOverloadedOperator() && 9257 "Expected an overloaded operator declaration"); 9258 9259 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9260 9261 // C++ [over.oper]p5: 9262 // The allocation and deallocation functions, operator new, 9263 // operator new[], operator delete and operator delete[], are 9264 // described completely in 3.7.3. The attributes and restrictions 9265 // found in the rest of this subclause do not apply to them unless 9266 // explicitly stated in 3.7.3. 9267 if (Op == OO_Delete || Op == OO_Array_Delete) 9268 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9269 9270 if (Op == OO_New || Op == OO_Array_New) 9271 return CheckOperatorNewDeclaration(*this, FnDecl); 9272 9273 // C++ [over.oper]p6: 9274 // An operator function shall either be a non-static member 9275 // function or be a non-member function and have at least one 9276 // parameter whose type is a class, a reference to a class, an 9277 // enumeration, or a reference to an enumeration. 9278 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9279 if (MethodDecl->isStatic()) 9280 return Diag(FnDecl->getLocation(), 9281 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9282 } else { 9283 bool ClassOrEnumParam = false; 9284 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9285 ParamEnd = FnDecl->param_end(); 9286 Param != ParamEnd; ++Param) { 9287 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9288 if (ParamType->isDependentType() || ParamType->isRecordType() || 9289 ParamType->isEnumeralType()) { 9290 ClassOrEnumParam = true; 9291 break; 9292 } 9293 } 9294 9295 if (!ClassOrEnumParam) 9296 return Diag(FnDecl->getLocation(), 9297 diag::err_operator_overload_needs_class_or_enum) 9298 << FnDecl->getDeclName(); 9299 } 9300 9301 // C++ [over.oper]p8: 9302 // An operator function cannot have default arguments (8.3.6), 9303 // except where explicitly stated below. 9304 // 9305 // Only the function-call operator allows default arguments 9306 // (C++ [over.call]p1). 9307 if (Op != OO_Call) { 9308 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9309 Param != FnDecl->param_end(); ++Param) { 9310 if ((*Param)->hasDefaultArg()) 9311 return Diag((*Param)->getLocation(), 9312 diag::err_operator_overload_default_arg) 9313 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9314 } 9315 } 9316 9317 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9318 { false, false, false } 9319#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9320 , { Unary, Binary, MemberOnly } 9321#include "clang/Basic/OperatorKinds.def" 9322 }; 9323 9324 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9325 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9326 bool MustBeMemberOperator = OperatorUses[Op][2]; 9327 9328 // C++ [over.oper]p8: 9329 // [...] Operator functions cannot have more or fewer parameters 9330 // than the number required for the corresponding operator, as 9331 // described in the rest of this subclause. 9332 unsigned NumParams = FnDecl->getNumParams() 9333 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9334 if (Op != OO_Call && 9335 ((NumParams == 1 && !CanBeUnaryOperator) || 9336 (NumParams == 2 && !CanBeBinaryOperator) || 9337 (NumParams < 1) || (NumParams > 2))) { 9338 // We have the wrong number of parameters. 9339 unsigned ErrorKind; 9340 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9341 ErrorKind = 2; // 2 -> unary or binary. 9342 } else if (CanBeUnaryOperator) { 9343 ErrorKind = 0; // 0 -> unary 9344 } else { 9345 assert(CanBeBinaryOperator && 9346 "All non-call overloaded operators are unary or binary!"); 9347 ErrorKind = 1; // 1 -> binary 9348 } 9349 9350 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9351 << FnDecl->getDeclName() << NumParams << ErrorKind; 9352 } 9353 9354 // Overloaded operators other than operator() cannot be variadic. 9355 if (Op != OO_Call && 9356 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9357 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9358 << FnDecl->getDeclName(); 9359 } 9360 9361 // Some operators must be non-static member functions. 9362 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9363 return Diag(FnDecl->getLocation(), 9364 diag::err_operator_overload_must_be_member) 9365 << FnDecl->getDeclName(); 9366 } 9367 9368 // C++ [over.inc]p1: 9369 // The user-defined function called operator++ implements the 9370 // prefix and postfix ++ operator. If this function is a member 9371 // function with no parameters, or a non-member function with one 9372 // parameter of class or enumeration type, it defines the prefix 9373 // increment operator ++ for objects of that type. If the function 9374 // is a member function with one parameter (which shall be of type 9375 // int) or a non-member function with two parameters (the second 9376 // of which shall be of type int), it defines the postfix 9377 // increment operator ++ for objects of that type. 9378 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9379 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9380 bool ParamIsInt = false; 9381 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9382 ParamIsInt = BT->getKind() == BuiltinType::Int; 9383 9384 if (!ParamIsInt) 9385 return Diag(LastParam->getLocation(), 9386 diag::err_operator_overload_post_incdec_must_be_int) 9387 << LastParam->getType() << (Op == OO_MinusMinus); 9388 } 9389 9390 return false; 9391} 9392 9393/// CheckLiteralOperatorDeclaration - Check whether the declaration 9394/// of this literal operator function is well-formed. If so, returns 9395/// false; otherwise, emits appropriate diagnostics and returns true. 9396bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9397 DeclContext *DC = FnDecl->getDeclContext(); 9398 Decl::Kind Kind = DC->getDeclKind(); 9399 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9400 Kind != Decl::LinkageSpec) { 9401 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9402 << FnDecl->getDeclName(); 9403 return true; 9404 } 9405 9406 bool Valid = false; 9407 9408 // template <char...> type operator "" name() is the only valid template 9409 // signature, and the only valid signature with no parameters. 9410 if (FnDecl->param_size() == 0) { 9411 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9412 // Must have only one template parameter 9413 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9414 if (Params->size() == 1) { 9415 NonTypeTemplateParmDecl *PmDecl = 9416 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9417 9418 // The template parameter must be a char parameter pack. 9419 if (PmDecl && PmDecl->isTemplateParameterPack() && 9420 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9421 Valid = true; 9422 } 9423 } 9424 } else { 9425 // Check the first parameter 9426 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9427 9428 QualType T = (*Param)->getType(); 9429 9430 // unsigned long long int, long double, and any character type are allowed 9431 // as the only parameters. 9432 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9433 Context.hasSameType(T, Context.LongDoubleTy) || 9434 Context.hasSameType(T, Context.CharTy) || 9435 Context.hasSameType(T, Context.WCharTy) || 9436 Context.hasSameType(T, Context.Char16Ty) || 9437 Context.hasSameType(T, Context.Char32Ty)) { 9438 if (++Param == FnDecl->param_end()) 9439 Valid = true; 9440 goto FinishedParams; 9441 } 9442 9443 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9444 const PointerType *PT = T->getAs<PointerType>(); 9445 if (!PT) 9446 goto FinishedParams; 9447 T = PT->getPointeeType(); 9448 if (!T.isConstQualified()) 9449 goto FinishedParams; 9450 T = T.getUnqualifiedType(); 9451 9452 // Move on to the second parameter; 9453 ++Param; 9454 9455 // If there is no second parameter, the first must be a const char * 9456 if (Param == FnDecl->param_end()) { 9457 if (Context.hasSameType(T, Context.CharTy)) 9458 Valid = true; 9459 goto FinishedParams; 9460 } 9461 9462 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9463 // are allowed as the first parameter to a two-parameter function 9464 if (!(Context.hasSameType(T, Context.CharTy) || 9465 Context.hasSameType(T, Context.WCharTy) || 9466 Context.hasSameType(T, Context.Char16Ty) || 9467 Context.hasSameType(T, Context.Char32Ty))) 9468 goto FinishedParams; 9469 9470 // The second and final parameter must be an std::size_t 9471 T = (*Param)->getType().getUnqualifiedType(); 9472 if (Context.hasSameType(T, Context.getSizeType()) && 9473 ++Param == FnDecl->param_end()) 9474 Valid = true; 9475 } 9476 9477 // FIXME: This diagnostic is absolutely terrible. 9478FinishedParams: 9479 if (!Valid) { 9480 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9481 << FnDecl->getDeclName(); 9482 return true; 9483 } 9484 9485 StringRef LiteralName 9486 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9487 if (LiteralName[0] != '_') { 9488 // C++0x [usrlit.suffix]p1: 9489 // Literal suffix identifiers that do not start with an underscore are 9490 // reserved for future standardization. 9491 bool IsHexFloat = true; 9492 if (LiteralName.size() > 1 && 9493 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9494 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9495 if (!isdigit(LiteralName[I])) { 9496 IsHexFloat = false; 9497 break; 9498 } 9499 } 9500 } 9501 9502 if (IsHexFloat) 9503 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9504 << LiteralName; 9505 else 9506 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9507 } 9508 9509 return false; 9510} 9511 9512/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9513/// linkage specification, including the language and (if present) 9514/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9515/// the location of the language string literal, which is provided 9516/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9517/// the '{' brace. Otherwise, this linkage specification does not 9518/// have any braces. 9519Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9520 SourceLocation LangLoc, 9521 StringRef Lang, 9522 SourceLocation LBraceLoc) { 9523 LinkageSpecDecl::LanguageIDs Language; 9524 if (Lang == "\"C\"") 9525 Language = LinkageSpecDecl::lang_c; 9526 else if (Lang == "\"C++\"") 9527 Language = LinkageSpecDecl::lang_cxx; 9528 else { 9529 Diag(LangLoc, diag::err_bad_language); 9530 return 0; 9531 } 9532 9533 // FIXME: Add all the various semantics of linkage specifications 9534 9535 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9536 ExternLoc, LangLoc, Language); 9537 CurContext->addDecl(D); 9538 PushDeclContext(S, D); 9539 return D; 9540} 9541 9542/// ActOnFinishLinkageSpecification - Complete the definition of 9543/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9544/// valid, it's the position of the closing '}' brace in a linkage 9545/// specification that uses braces. 9546Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9547 Decl *LinkageSpec, 9548 SourceLocation RBraceLoc) { 9549 if (LinkageSpec) { 9550 if (RBraceLoc.isValid()) { 9551 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9552 LSDecl->setRBraceLoc(RBraceLoc); 9553 } 9554 PopDeclContext(); 9555 } 9556 return LinkageSpec; 9557} 9558 9559/// \brief Perform semantic analysis for the variable declaration that 9560/// occurs within a C++ catch clause, returning the newly-created 9561/// variable. 9562VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9563 TypeSourceInfo *TInfo, 9564 SourceLocation StartLoc, 9565 SourceLocation Loc, 9566 IdentifierInfo *Name) { 9567 bool Invalid = false; 9568 QualType ExDeclType = TInfo->getType(); 9569 9570 // Arrays and functions decay. 9571 if (ExDeclType->isArrayType()) 9572 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9573 else if (ExDeclType->isFunctionType()) 9574 ExDeclType = Context.getPointerType(ExDeclType); 9575 9576 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9577 // The exception-declaration shall not denote a pointer or reference to an 9578 // incomplete type, other than [cv] void*. 9579 // N2844 forbids rvalue references. 9580 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9581 Diag(Loc, diag::err_catch_rvalue_ref); 9582 Invalid = true; 9583 } 9584 9585 // GCC allows catching pointers and references to incomplete types 9586 // as an extension; so do we, but we warn by default. 9587 9588 QualType BaseType = ExDeclType; 9589 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9590 unsigned DK = diag::err_catch_incomplete; 9591 bool IncompleteCatchIsInvalid = true; 9592 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9593 BaseType = Ptr->getPointeeType(); 9594 Mode = 1; 9595 DK = diag::ext_catch_incomplete_ptr; 9596 IncompleteCatchIsInvalid = false; 9597 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9598 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9599 BaseType = Ref->getPointeeType(); 9600 Mode = 2; 9601 DK = diag::ext_catch_incomplete_ref; 9602 IncompleteCatchIsInvalid = false; 9603 } 9604 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9605 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9606 IncompleteCatchIsInvalid) 9607 Invalid = true; 9608 9609 if (!Invalid && !ExDeclType->isDependentType() && 9610 RequireNonAbstractType(Loc, ExDeclType, 9611 diag::err_abstract_type_in_decl, 9612 AbstractVariableType)) 9613 Invalid = true; 9614 9615 // Only the non-fragile NeXT runtime currently supports C++ catches 9616 // of ObjC types, and no runtime supports catching ObjC types by value. 9617 if (!Invalid && getLangOptions().ObjC1) { 9618 QualType T = ExDeclType; 9619 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9620 T = RT->getPointeeType(); 9621 9622 if (T->isObjCObjectType()) { 9623 Diag(Loc, diag::err_objc_object_catch); 9624 Invalid = true; 9625 } else if (T->isObjCObjectPointerType()) { 9626 if (!getLangOptions().ObjCNonFragileABI) 9627 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9628 } 9629 } 9630 9631 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9632 ExDeclType, TInfo, SC_None, SC_None); 9633 ExDecl->setExceptionVariable(true); 9634 9635 // In ARC, infer 'retaining' for variables of retainable type. 9636 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9637 Invalid = true; 9638 9639 if (!Invalid && !ExDeclType->isDependentType()) { 9640 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9641 // C++ [except.handle]p16: 9642 // The object declared in an exception-declaration or, if the 9643 // exception-declaration does not specify a name, a temporary (12.2) is 9644 // copy-initialized (8.5) from the exception object. [...] 9645 // The object is destroyed when the handler exits, after the destruction 9646 // of any automatic objects initialized within the handler. 9647 // 9648 // We just pretend to initialize the object with itself, then make sure 9649 // it can be destroyed later. 9650 QualType initType = ExDeclType; 9651 9652 InitializedEntity entity = 9653 InitializedEntity::InitializeVariable(ExDecl); 9654 InitializationKind initKind = 9655 InitializationKind::CreateCopy(Loc, SourceLocation()); 9656 9657 Expr *opaqueValue = 9658 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9659 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9660 ExprResult result = sequence.Perform(*this, entity, initKind, 9661 MultiExprArg(&opaqueValue, 1)); 9662 if (result.isInvalid()) 9663 Invalid = true; 9664 else { 9665 // If the constructor used was non-trivial, set this as the 9666 // "initializer". 9667 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9668 if (!construct->getConstructor()->isTrivial()) { 9669 Expr *init = MaybeCreateExprWithCleanups(construct); 9670 ExDecl->setInit(init); 9671 } 9672 9673 // And make sure it's destructable. 9674 FinalizeVarWithDestructor(ExDecl, recordType); 9675 } 9676 } 9677 } 9678 9679 if (Invalid) 9680 ExDecl->setInvalidDecl(); 9681 9682 return ExDecl; 9683} 9684 9685/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9686/// handler. 9687Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9688 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9689 bool Invalid = D.isInvalidType(); 9690 9691 // Check for unexpanded parameter packs. 9692 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9693 UPPC_ExceptionType)) { 9694 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9695 D.getIdentifierLoc()); 9696 Invalid = true; 9697 } 9698 9699 IdentifierInfo *II = D.getIdentifier(); 9700 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9701 LookupOrdinaryName, 9702 ForRedeclaration)) { 9703 // The scope should be freshly made just for us. There is just no way 9704 // it contains any previous declaration. 9705 assert(!S->isDeclScope(PrevDecl)); 9706 if (PrevDecl->isTemplateParameter()) { 9707 // Maybe we will complain about the shadowed template parameter. 9708 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9709 PrevDecl = 0; 9710 } 9711 } 9712 9713 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9714 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9715 << D.getCXXScopeSpec().getRange(); 9716 Invalid = true; 9717 } 9718 9719 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9720 D.getSourceRange().getBegin(), 9721 D.getIdentifierLoc(), 9722 D.getIdentifier()); 9723 if (Invalid) 9724 ExDecl->setInvalidDecl(); 9725 9726 // Add the exception declaration into this scope. 9727 if (II) 9728 PushOnScopeChains(ExDecl, S); 9729 else 9730 CurContext->addDecl(ExDecl); 9731 9732 ProcessDeclAttributes(S, ExDecl, D); 9733 return ExDecl; 9734} 9735 9736Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9737 Expr *AssertExpr, 9738 Expr *AssertMessageExpr_, 9739 SourceLocation RParenLoc) { 9740 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9741 9742 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9743 llvm::APSInt Cond; 9744 if (VerifyIntegerConstantExpression(AssertExpr, &Cond, 9745 diag::err_static_assert_expression_is_not_constant, 9746 /*AllowFold=*/false)) 9747 return 0; 9748 9749 if (!Cond) 9750 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9751 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9752 } 9753 9754 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9755 return 0; 9756 9757 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9758 AssertExpr, AssertMessage, RParenLoc); 9759 9760 CurContext->addDecl(Decl); 9761 return Decl; 9762} 9763 9764/// \brief Perform semantic analysis of the given friend type declaration. 9765/// 9766/// \returns A friend declaration that. 9767FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9768 SourceLocation FriendLoc, 9769 TypeSourceInfo *TSInfo) { 9770 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9771 9772 QualType T = TSInfo->getType(); 9773 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9774 9775 // C++03 [class.friend]p2: 9776 // An elaborated-type-specifier shall be used in a friend declaration 9777 // for a class.* 9778 // 9779 // * The class-key of the elaborated-type-specifier is required. 9780 if (!ActiveTemplateInstantiations.empty()) { 9781 // Do not complain about the form of friend template types during 9782 // template instantiation; we will already have complained when the 9783 // template was declared. 9784 } else if (!T->isElaboratedTypeSpecifier()) { 9785 // If we evaluated the type to a record type, suggest putting 9786 // a tag in front. 9787 if (const RecordType *RT = T->getAs<RecordType>()) { 9788 RecordDecl *RD = RT->getDecl(); 9789 9790 std::string InsertionText = std::string(" ") + RD->getKindName(); 9791 9792 Diag(TypeRange.getBegin(), 9793 getLangOptions().CPlusPlus0x ? 9794 diag::warn_cxx98_compat_unelaborated_friend_type : 9795 diag::ext_unelaborated_friend_type) 9796 << (unsigned) RD->getTagKind() 9797 << T 9798 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9799 InsertionText); 9800 } else { 9801 Diag(FriendLoc, 9802 getLangOptions().CPlusPlus0x ? 9803 diag::warn_cxx98_compat_nonclass_type_friend : 9804 diag::ext_nonclass_type_friend) 9805 << T 9806 << SourceRange(FriendLoc, TypeRange.getEnd()); 9807 } 9808 } else if (T->getAs<EnumType>()) { 9809 Diag(FriendLoc, 9810 getLangOptions().CPlusPlus0x ? 9811 diag::warn_cxx98_compat_enum_friend : 9812 diag::ext_enum_friend) 9813 << T 9814 << SourceRange(FriendLoc, TypeRange.getEnd()); 9815 } 9816 9817 // C++0x [class.friend]p3: 9818 // If the type specifier in a friend declaration designates a (possibly 9819 // cv-qualified) class type, that class is declared as a friend; otherwise, 9820 // the friend declaration is ignored. 9821 9822 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9823 // in [class.friend]p3 that we do not implement. 9824 9825 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9826} 9827 9828/// Handle a friend tag declaration where the scope specifier was 9829/// templated. 9830Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9831 unsigned TagSpec, SourceLocation TagLoc, 9832 CXXScopeSpec &SS, 9833 IdentifierInfo *Name, SourceLocation NameLoc, 9834 AttributeList *Attr, 9835 MultiTemplateParamsArg TempParamLists) { 9836 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9837 9838 bool isExplicitSpecialization = false; 9839 bool Invalid = false; 9840 9841 if (TemplateParameterList *TemplateParams 9842 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9843 TempParamLists.get(), 9844 TempParamLists.size(), 9845 /*friend*/ true, 9846 isExplicitSpecialization, 9847 Invalid)) { 9848 if (TemplateParams->size() > 0) { 9849 // This is a declaration of a class template. 9850 if (Invalid) 9851 return 0; 9852 9853 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9854 SS, Name, NameLoc, Attr, 9855 TemplateParams, AS_public, 9856 /*ModulePrivateLoc=*/SourceLocation(), 9857 TempParamLists.size() - 1, 9858 (TemplateParameterList**) TempParamLists.release()).take(); 9859 } else { 9860 // The "template<>" header is extraneous. 9861 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9862 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9863 isExplicitSpecialization = true; 9864 } 9865 } 9866 9867 if (Invalid) return 0; 9868 9869 bool isAllExplicitSpecializations = true; 9870 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9871 if (TempParamLists.get()[I]->size()) { 9872 isAllExplicitSpecializations = false; 9873 break; 9874 } 9875 } 9876 9877 // FIXME: don't ignore attributes. 9878 9879 // If it's explicit specializations all the way down, just forget 9880 // about the template header and build an appropriate non-templated 9881 // friend. TODO: for source fidelity, remember the headers. 9882 if (isAllExplicitSpecializations) { 9883 if (SS.isEmpty()) { 9884 bool Owned = false; 9885 bool IsDependent = false; 9886 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9887 Attr, AS_public, 9888 /*ModulePrivateLoc=*/SourceLocation(), 9889 MultiTemplateParamsArg(), Owned, IsDependent, 9890 /*ScopedEnumKWLoc=*/SourceLocation(), 9891 /*ScopedEnumUsesClassTag=*/false, 9892 /*UnderlyingType=*/TypeResult()); 9893 } 9894 9895 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9896 ElaboratedTypeKeyword Keyword 9897 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9898 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9899 *Name, NameLoc); 9900 if (T.isNull()) 9901 return 0; 9902 9903 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9904 if (isa<DependentNameType>(T)) { 9905 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9906 TL.setKeywordLoc(TagLoc); 9907 TL.setQualifierLoc(QualifierLoc); 9908 TL.setNameLoc(NameLoc); 9909 } else { 9910 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9911 TL.setKeywordLoc(TagLoc); 9912 TL.setQualifierLoc(QualifierLoc); 9913 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9914 } 9915 9916 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9917 TSI, FriendLoc); 9918 Friend->setAccess(AS_public); 9919 CurContext->addDecl(Friend); 9920 return Friend; 9921 } 9922 9923 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9924 9925 9926 9927 // Handle the case of a templated-scope friend class. e.g. 9928 // template <class T> class A<T>::B; 9929 // FIXME: we don't support these right now. 9930 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9931 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9932 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9933 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9934 TL.setKeywordLoc(TagLoc); 9935 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9936 TL.setNameLoc(NameLoc); 9937 9938 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9939 TSI, FriendLoc); 9940 Friend->setAccess(AS_public); 9941 Friend->setUnsupportedFriend(true); 9942 CurContext->addDecl(Friend); 9943 return Friend; 9944} 9945 9946 9947/// Handle a friend type declaration. This works in tandem with 9948/// ActOnTag. 9949/// 9950/// Notes on friend class templates: 9951/// 9952/// We generally treat friend class declarations as if they were 9953/// declaring a class. So, for example, the elaborated type specifier 9954/// in a friend declaration is required to obey the restrictions of a 9955/// class-head (i.e. no typedefs in the scope chain), template 9956/// parameters are required to match up with simple template-ids, &c. 9957/// However, unlike when declaring a template specialization, it's 9958/// okay to refer to a template specialization without an empty 9959/// template parameter declaration, e.g. 9960/// friend class A<T>::B<unsigned>; 9961/// We permit this as a special case; if there are any template 9962/// parameters present at all, require proper matching, i.e. 9963/// template <> template <class T> friend class A<int>::B; 9964Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9965 MultiTemplateParamsArg TempParams) { 9966 SourceLocation Loc = DS.getSourceRange().getBegin(); 9967 9968 assert(DS.isFriendSpecified()); 9969 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9970 9971 // Try to convert the decl specifier to a type. This works for 9972 // friend templates because ActOnTag never produces a ClassTemplateDecl 9973 // for a TUK_Friend. 9974 Declarator TheDeclarator(DS, Declarator::MemberContext); 9975 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9976 QualType T = TSI->getType(); 9977 if (TheDeclarator.isInvalidType()) 9978 return 0; 9979 9980 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9981 return 0; 9982 9983 // This is definitely an error in C++98. It's probably meant to 9984 // be forbidden in C++0x, too, but the specification is just 9985 // poorly written. 9986 // 9987 // The problem is with declarations like the following: 9988 // template <T> friend A<T>::foo; 9989 // where deciding whether a class C is a friend or not now hinges 9990 // on whether there exists an instantiation of A that causes 9991 // 'foo' to equal C. There are restrictions on class-heads 9992 // (which we declare (by fiat) elaborated friend declarations to 9993 // be) that makes this tractable. 9994 // 9995 // FIXME: handle "template <> friend class A<T>;", which 9996 // is possibly well-formed? Who even knows? 9997 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9998 Diag(Loc, diag::err_tagless_friend_type_template) 9999 << DS.getSourceRange(); 10000 return 0; 10001 } 10002 10003 // C++98 [class.friend]p1: A friend of a class is a function 10004 // or class that is not a member of the class . . . 10005 // This is fixed in DR77, which just barely didn't make the C++03 10006 // deadline. It's also a very silly restriction that seriously 10007 // affects inner classes and which nobody else seems to implement; 10008 // thus we never diagnose it, not even in -pedantic. 10009 // 10010 // But note that we could warn about it: it's always useless to 10011 // friend one of your own members (it's not, however, worthless to 10012 // friend a member of an arbitrary specialization of your template). 10013 10014 Decl *D; 10015 if (unsigned NumTempParamLists = TempParams.size()) 10016 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10017 NumTempParamLists, 10018 TempParams.release(), 10019 TSI, 10020 DS.getFriendSpecLoc()); 10021 else 10022 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10023 10024 if (!D) 10025 return 0; 10026 10027 D->setAccess(AS_public); 10028 CurContext->addDecl(D); 10029 10030 return D; 10031} 10032 10033Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10034 MultiTemplateParamsArg TemplateParams) { 10035 const DeclSpec &DS = D.getDeclSpec(); 10036 10037 assert(DS.isFriendSpecified()); 10038 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10039 10040 SourceLocation Loc = D.getIdentifierLoc(); 10041 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10042 10043 // C++ [class.friend]p1 10044 // A friend of a class is a function or class.... 10045 // Note that this sees through typedefs, which is intended. 10046 // It *doesn't* see through dependent types, which is correct 10047 // according to [temp.arg.type]p3: 10048 // If a declaration acquires a function type through a 10049 // type dependent on a template-parameter and this causes 10050 // a declaration that does not use the syntactic form of a 10051 // function declarator to have a function type, the program 10052 // is ill-formed. 10053 if (!TInfo->getType()->isFunctionType()) { 10054 Diag(Loc, diag::err_unexpected_friend); 10055 10056 // It might be worthwhile to try to recover by creating an 10057 // appropriate declaration. 10058 return 0; 10059 } 10060 10061 // C++ [namespace.memdef]p3 10062 // - If a friend declaration in a non-local class first declares a 10063 // class or function, the friend class or function is a member 10064 // of the innermost enclosing namespace. 10065 // - The name of the friend is not found by simple name lookup 10066 // until a matching declaration is provided in that namespace 10067 // scope (either before or after the class declaration granting 10068 // friendship). 10069 // - If a friend function is called, its name may be found by the 10070 // name lookup that considers functions from namespaces and 10071 // classes associated with the types of the function arguments. 10072 // - When looking for a prior declaration of a class or a function 10073 // declared as a friend, scopes outside the innermost enclosing 10074 // namespace scope are not considered. 10075 10076 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10077 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10078 DeclarationName Name = NameInfo.getName(); 10079 assert(Name); 10080 10081 // Check for unexpanded parameter packs. 10082 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10083 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10084 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10085 return 0; 10086 10087 // The context we found the declaration in, or in which we should 10088 // create the declaration. 10089 DeclContext *DC; 10090 Scope *DCScope = S; 10091 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10092 ForRedeclaration); 10093 10094 // FIXME: there are different rules in local classes 10095 10096 // There are four cases here. 10097 // - There's no scope specifier, in which case we just go to the 10098 // appropriate scope and look for a function or function template 10099 // there as appropriate. 10100 // Recover from invalid scope qualifiers as if they just weren't there. 10101 if (SS.isInvalid() || !SS.isSet()) { 10102 // C++0x [namespace.memdef]p3: 10103 // If the name in a friend declaration is neither qualified nor 10104 // a template-id and the declaration is a function or an 10105 // elaborated-type-specifier, the lookup to determine whether 10106 // the entity has been previously declared shall not consider 10107 // any scopes outside the innermost enclosing namespace. 10108 // C++0x [class.friend]p11: 10109 // If a friend declaration appears in a local class and the name 10110 // specified is an unqualified name, a prior declaration is 10111 // looked up without considering scopes that are outside the 10112 // innermost enclosing non-class scope. For a friend function 10113 // declaration, if there is no prior declaration, the program is 10114 // ill-formed. 10115 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10116 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10117 10118 // Find the appropriate context according to the above. 10119 DC = CurContext; 10120 while (true) { 10121 // Skip class contexts. If someone can cite chapter and verse 10122 // for this behavior, that would be nice --- it's what GCC and 10123 // EDG do, and it seems like a reasonable intent, but the spec 10124 // really only says that checks for unqualified existing 10125 // declarations should stop at the nearest enclosing namespace, 10126 // not that they should only consider the nearest enclosing 10127 // namespace. 10128 while (DC->isRecord()) 10129 DC = DC->getParent(); 10130 10131 LookupQualifiedName(Previous, DC); 10132 10133 // TODO: decide what we think about using declarations. 10134 if (isLocal || !Previous.empty()) 10135 break; 10136 10137 if (isTemplateId) { 10138 if (isa<TranslationUnitDecl>(DC)) break; 10139 } else { 10140 if (DC->isFileContext()) break; 10141 } 10142 DC = DC->getParent(); 10143 } 10144 10145 // C++ [class.friend]p1: A friend of a class is a function or 10146 // class that is not a member of the class . . . 10147 // C++11 changes this for both friend types and functions. 10148 // Most C++ 98 compilers do seem to give an error here, so 10149 // we do, too. 10150 if (!Previous.empty() && DC->Equals(CurContext)) 10151 Diag(DS.getFriendSpecLoc(), 10152 getLangOptions().CPlusPlus0x ? 10153 diag::warn_cxx98_compat_friend_is_member : 10154 diag::err_friend_is_member); 10155 10156 DCScope = getScopeForDeclContext(S, DC); 10157 10158 // C++ [class.friend]p6: 10159 // A function can be defined in a friend declaration of a class if and 10160 // only if the class is a non-local class (9.8), the function name is 10161 // unqualified, and the function has namespace scope. 10162 if (isLocal && D.isFunctionDefinition()) { 10163 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10164 } 10165 10166 // - There's a non-dependent scope specifier, in which case we 10167 // compute it and do a previous lookup there for a function 10168 // or function template. 10169 } else if (!SS.getScopeRep()->isDependent()) { 10170 DC = computeDeclContext(SS); 10171 if (!DC) return 0; 10172 10173 if (RequireCompleteDeclContext(SS, DC)) return 0; 10174 10175 LookupQualifiedName(Previous, DC); 10176 10177 // Ignore things found implicitly in the wrong scope. 10178 // TODO: better diagnostics for this case. Suggesting the right 10179 // qualified scope would be nice... 10180 LookupResult::Filter F = Previous.makeFilter(); 10181 while (F.hasNext()) { 10182 NamedDecl *D = F.next(); 10183 if (!DC->InEnclosingNamespaceSetOf( 10184 D->getDeclContext()->getRedeclContext())) 10185 F.erase(); 10186 } 10187 F.done(); 10188 10189 if (Previous.empty()) { 10190 D.setInvalidType(); 10191 Diag(Loc, diag::err_qualified_friend_not_found) 10192 << Name << TInfo->getType(); 10193 return 0; 10194 } 10195 10196 // C++ [class.friend]p1: A friend of a class is a function or 10197 // class that is not a member of the class . . . 10198 if (DC->Equals(CurContext)) 10199 Diag(DS.getFriendSpecLoc(), 10200 getLangOptions().CPlusPlus0x ? 10201 diag::warn_cxx98_compat_friend_is_member : 10202 diag::err_friend_is_member); 10203 10204 if (D.isFunctionDefinition()) { 10205 // C++ [class.friend]p6: 10206 // A function can be defined in a friend declaration of a class if and 10207 // only if the class is a non-local class (9.8), the function name is 10208 // unqualified, and the function has namespace scope. 10209 SemaDiagnosticBuilder DB 10210 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10211 10212 DB << SS.getScopeRep(); 10213 if (DC->isFileContext()) 10214 DB << FixItHint::CreateRemoval(SS.getRange()); 10215 SS.clear(); 10216 } 10217 10218 // - There's a scope specifier that does not match any template 10219 // parameter lists, in which case we use some arbitrary context, 10220 // create a method or method template, and wait for instantiation. 10221 // - There's a scope specifier that does match some template 10222 // parameter lists, which we don't handle right now. 10223 } else { 10224 if (D.isFunctionDefinition()) { 10225 // C++ [class.friend]p6: 10226 // A function can be defined in a friend declaration of a class if and 10227 // only if the class is a non-local class (9.8), the function name is 10228 // unqualified, and the function has namespace scope. 10229 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10230 << SS.getScopeRep(); 10231 } 10232 10233 DC = CurContext; 10234 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10235 } 10236 10237 if (!DC->isRecord()) { 10238 // This implies that it has to be an operator or function. 10239 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10240 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10241 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10242 Diag(Loc, diag::err_introducing_special_friend) << 10243 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10244 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10245 return 0; 10246 } 10247 } 10248 10249 // FIXME: This is an egregious hack to cope with cases where the scope stack 10250 // does not contain the declaration context, i.e., in an out-of-line 10251 // definition of a class. 10252 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10253 if (!DCScope) { 10254 FakeDCScope.setEntity(DC); 10255 DCScope = &FakeDCScope; 10256 } 10257 10258 bool AddToScope = true; 10259 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10260 move(TemplateParams), AddToScope); 10261 if (!ND) return 0; 10262 10263 assert(ND->getDeclContext() == DC); 10264 assert(ND->getLexicalDeclContext() == CurContext); 10265 10266 // Add the function declaration to the appropriate lookup tables, 10267 // adjusting the redeclarations list as necessary. We don't 10268 // want to do this yet if the friending class is dependent. 10269 // 10270 // Also update the scope-based lookup if the target context's 10271 // lookup context is in lexical scope. 10272 if (!CurContext->isDependentContext()) { 10273 DC = DC->getRedeclContext(); 10274 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10275 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10276 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10277 } 10278 10279 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10280 D.getIdentifierLoc(), ND, 10281 DS.getFriendSpecLoc()); 10282 FrD->setAccess(AS_public); 10283 CurContext->addDecl(FrD); 10284 10285 if (ND->isInvalidDecl()) 10286 FrD->setInvalidDecl(); 10287 else { 10288 FunctionDecl *FD; 10289 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10290 FD = FTD->getTemplatedDecl(); 10291 else 10292 FD = cast<FunctionDecl>(ND); 10293 10294 // Mark templated-scope function declarations as unsupported. 10295 if (FD->getNumTemplateParameterLists()) 10296 FrD->setUnsupportedFriend(true); 10297 } 10298 10299 return ND; 10300} 10301 10302void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10303 AdjustDeclIfTemplate(Dcl); 10304 10305 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10306 if (!Fn) { 10307 Diag(DelLoc, diag::err_deleted_non_function); 10308 return; 10309 } 10310 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10311 Diag(DelLoc, diag::err_deleted_decl_not_first); 10312 Diag(Prev->getLocation(), diag::note_previous_declaration); 10313 // If the declaration wasn't the first, we delete the function anyway for 10314 // recovery. 10315 } 10316 Fn->setDeletedAsWritten(); 10317} 10318 10319void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10320 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10321 10322 if (MD) { 10323 if (MD->getParent()->isDependentType()) { 10324 MD->setDefaulted(); 10325 MD->setExplicitlyDefaulted(); 10326 return; 10327 } 10328 10329 CXXSpecialMember Member = getSpecialMember(MD); 10330 if (Member == CXXInvalid) { 10331 Diag(DefaultLoc, diag::err_default_special_members); 10332 return; 10333 } 10334 10335 MD->setDefaulted(); 10336 MD->setExplicitlyDefaulted(); 10337 10338 // If this definition appears within the record, do the checking when 10339 // the record is complete. 10340 const FunctionDecl *Primary = MD; 10341 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10342 // Find the uninstantiated declaration that actually had the '= default' 10343 // on it. 10344 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10345 10346 if (Primary == Primary->getCanonicalDecl()) 10347 return; 10348 10349 switch (Member) { 10350 case CXXDefaultConstructor: { 10351 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10352 CheckExplicitlyDefaultedDefaultConstructor(CD); 10353 if (!CD->isInvalidDecl()) 10354 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10355 break; 10356 } 10357 10358 case CXXCopyConstructor: { 10359 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10360 CheckExplicitlyDefaultedCopyConstructor(CD); 10361 if (!CD->isInvalidDecl()) 10362 DefineImplicitCopyConstructor(DefaultLoc, CD); 10363 break; 10364 } 10365 10366 case CXXCopyAssignment: { 10367 CheckExplicitlyDefaultedCopyAssignment(MD); 10368 if (!MD->isInvalidDecl()) 10369 DefineImplicitCopyAssignment(DefaultLoc, MD); 10370 break; 10371 } 10372 10373 case CXXDestructor: { 10374 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10375 CheckExplicitlyDefaultedDestructor(DD); 10376 if (!DD->isInvalidDecl()) 10377 DefineImplicitDestructor(DefaultLoc, DD); 10378 break; 10379 } 10380 10381 case CXXMoveConstructor: { 10382 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10383 CheckExplicitlyDefaultedMoveConstructor(CD); 10384 if (!CD->isInvalidDecl()) 10385 DefineImplicitMoveConstructor(DefaultLoc, CD); 10386 break; 10387 } 10388 10389 case CXXMoveAssignment: { 10390 CheckExplicitlyDefaultedMoveAssignment(MD); 10391 if (!MD->isInvalidDecl()) 10392 DefineImplicitMoveAssignment(DefaultLoc, MD); 10393 break; 10394 } 10395 10396 case CXXInvalid: 10397 llvm_unreachable("Invalid special member."); 10398 } 10399 } else { 10400 Diag(DefaultLoc, diag::err_default_special_members); 10401 } 10402} 10403 10404static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10405 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10406 Stmt *SubStmt = *CI; 10407 if (!SubStmt) 10408 continue; 10409 if (isa<ReturnStmt>(SubStmt)) 10410 Self.Diag(SubStmt->getSourceRange().getBegin(), 10411 diag::err_return_in_constructor_handler); 10412 if (!isa<Expr>(SubStmt)) 10413 SearchForReturnInStmt(Self, SubStmt); 10414 } 10415} 10416 10417void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10418 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10419 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10420 SearchForReturnInStmt(*this, Handler); 10421 } 10422} 10423 10424bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10425 const CXXMethodDecl *Old) { 10426 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10427 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10428 10429 if (Context.hasSameType(NewTy, OldTy) || 10430 NewTy->isDependentType() || OldTy->isDependentType()) 10431 return false; 10432 10433 // Check if the return types are covariant 10434 QualType NewClassTy, OldClassTy; 10435 10436 /// Both types must be pointers or references to classes. 10437 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10438 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10439 NewClassTy = NewPT->getPointeeType(); 10440 OldClassTy = OldPT->getPointeeType(); 10441 } 10442 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10443 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10444 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10445 NewClassTy = NewRT->getPointeeType(); 10446 OldClassTy = OldRT->getPointeeType(); 10447 } 10448 } 10449 } 10450 10451 // The return types aren't either both pointers or references to a class type. 10452 if (NewClassTy.isNull()) { 10453 Diag(New->getLocation(), 10454 diag::err_different_return_type_for_overriding_virtual_function) 10455 << New->getDeclName() << NewTy << OldTy; 10456 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10457 10458 return true; 10459 } 10460 10461 // C++ [class.virtual]p6: 10462 // If the return type of D::f differs from the return type of B::f, the 10463 // class type in the return type of D::f shall be complete at the point of 10464 // declaration of D::f or shall be the class type D. 10465 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10466 if (!RT->isBeingDefined() && 10467 RequireCompleteType(New->getLocation(), NewClassTy, 10468 PDiag(diag::err_covariant_return_incomplete) 10469 << New->getDeclName())) 10470 return true; 10471 } 10472 10473 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10474 // Check if the new class derives from the old class. 10475 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10476 Diag(New->getLocation(), 10477 diag::err_covariant_return_not_derived) 10478 << New->getDeclName() << NewTy << OldTy; 10479 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10480 return true; 10481 } 10482 10483 // Check if we the conversion from derived to base is valid. 10484 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10485 diag::err_covariant_return_inaccessible_base, 10486 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10487 // FIXME: Should this point to the return type? 10488 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10489 // FIXME: this note won't trigger for delayed access control 10490 // diagnostics, and it's impossible to get an undelayed error 10491 // here from access control during the original parse because 10492 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10493 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10494 return true; 10495 } 10496 } 10497 10498 // The qualifiers of the return types must be the same. 10499 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10500 Diag(New->getLocation(), 10501 diag::err_covariant_return_type_different_qualifications) 10502 << New->getDeclName() << NewTy << OldTy; 10503 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10504 return true; 10505 }; 10506 10507 10508 // The new class type must have the same or less qualifiers as the old type. 10509 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10510 Diag(New->getLocation(), 10511 diag::err_covariant_return_type_class_type_more_qualified) 10512 << New->getDeclName() << NewTy << OldTy; 10513 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10514 return true; 10515 }; 10516 10517 return false; 10518} 10519 10520/// \brief Mark the given method pure. 10521/// 10522/// \param Method the method to be marked pure. 10523/// 10524/// \param InitRange the source range that covers the "0" initializer. 10525bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10526 SourceLocation EndLoc = InitRange.getEnd(); 10527 if (EndLoc.isValid()) 10528 Method->setRangeEnd(EndLoc); 10529 10530 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10531 Method->setPure(); 10532 return false; 10533 } 10534 10535 if (!Method->isInvalidDecl()) 10536 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10537 << Method->getDeclName() << InitRange; 10538 return true; 10539} 10540 10541/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10542/// an initializer for the out-of-line declaration 'Dcl'. The scope 10543/// is a fresh scope pushed for just this purpose. 10544/// 10545/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10546/// static data member of class X, names should be looked up in the scope of 10547/// class X. 10548void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10549 // If there is no declaration, there was an error parsing it. 10550 if (D == 0 || D->isInvalidDecl()) return; 10551 10552 // We should only get called for declarations with scope specifiers, like: 10553 // int foo::bar; 10554 assert(D->isOutOfLine()); 10555 EnterDeclaratorContext(S, D->getDeclContext()); 10556} 10557 10558/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10559/// initializer for the out-of-line declaration 'D'. 10560void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10561 // If there is no declaration, there was an error parsing it. 10562 if (D == 0 || D->isInvalidDecl()) return; 10563 10564 assert(D->isOutOfLine()); 10565 ExitDeclaratorContext(S); 10566} 10567 10568/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10569/// C++ if/switch/while/for statement. 10570/// e.g: "if (int x = f()) {...}" 10571DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10572 // C++ 6.4p2: 10573 // The declarator shall not specify a function or an array. 10574 // The type-specifier-seq shall not contain typedef and shall not declare a 10575 // new class or enumeration. 10576 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10577 "Parser allowed 'typedef' as storage class of condition decl."); 10578 10579 Decl *Dcl = ActOnDeclarator(S, D); 10580 if (!Dcl) 10581 return true; 10582 10583 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10584 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10585 << D.getSourceRange(); 10586 return true; 10587 } 10588 10589 return Dcl; 10590} 10591 10592void Sema::LoadExternalVTableUses() { 10593 if (!ExternalSource) 10594 return; 10595 10596 SmallVector<ExternalVTableUse, 4> VTables; 10597 ExternalSource->ReadUsedVTables(VTables); 10598 SmallVector<VTableUse, 4> NewUses; 10599 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10600 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10601 = VTablesUsed.find(VTables[I].Record); 10602 // Even if a definition wasn't required before, it may be required now. 10603 if (Pos != VTablesUsed.end()) { 10604 if (!Pos->second && VTables[I].DefinitionRequired) 10605 Pos->second = true; 10606 continue; 10607 } 10608 10609 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10610 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10611 } 10612 10613 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10614} 10615 10616void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10617 bool DefinitionRequired) { 10618 // Ignore any vtable uses in unevaluated operands or for classes that do 10619 // not have a vtable. 10620 if (!Class->isDynamicClass() || Class->isDependentContext() || 10621 CurContext->isDependentContext() || 10622 ExprEvalContexts.back().Context == Unevaluated || 10623 ExprEvalContexts.back().Context == ConstantEvaluated) 10624 return; 10625 10626 // Try to insert this class into the map. 10627 LoadExternalVTableUses(); 10628 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10629 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10630 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10631 if (!Pos.second) { 10632 // If we already had an entry, check to see if we are promoting this vtable 10633 // to required a definition. If so, we need to reappend to the VTableUses 10634 // list, since we may have already processed the first entry. 10635 if (DefinitionRequired && !Pos.first->second) { 10636 Pos.first->second = true; 10637 } else { 10638 // Otherwise, we can early exit. 10639 return; 10640 } 10641 } 10642 10643 // Local classes need to have their virtual members marked 10644 // immediately. For all other classes, we mark their virtual members 10645 // at the end of the translation unit. 10646 if (Class->isLocalClass()) 10647 MarkVirtualMembersReferenced(Loc, Class); 10648 else 10649 VTableUses.push_back(std::make_pair(Class, Loc)); 10650} 10651 10652bool Sema::DefineUsedVTables() { 10653 LoadExternalVTableUses(); 10654 if (VTableUses.empty()) 10655 return false; 10656 10657 // Note: The VTableUses vector could grow as a result of marking 10658 // the members of a class as "used", so we check the size each 10659 // time through the loop and prefer indices (with are stable) to 10660 // iterators (which are not). 10661 bool DefinedAnything = false; 10662 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10663 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10664 if (!Class) 10665 continue; 10666 10667 SourceLocation Loc = VTableUses[I].second; 10668 10669 // If this class has a key function, but that key function is 10670 // defined in another translation unit, we don't need to emit the 10671 // vtable even though we're using it. 10672 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10673 if (KeyFunction && !KeyFunction->hasBody()) { 10674 switch (KeyFunction->getTemplateSpecializationKind()) { 10675 case TSK_Undeclared: 10676 case TSK_ExplicitSpecialization: 10677 case TSK_ExplicitInstantiationDeclaration: 10678 // The key function is in another translation unit. 10679 continue; 10680 10681 case TSK_ExplicitInstantiationDefinition: 10682 case TSK_ImplicitInstantiation: 10683 // We will be instantiating the key function. 10684 break; 10685 } 10686 } else if (!KeyFunction) { 10687 // If we have a class with no key function that is the subject 10688 // of an explicit instantiation declaration, suppress the 10689 // vtable; it will live with the explicit instantiation 10690 // definition. 10691 bool IsExplicitInstantiationDeclaration 10692 = Class->getTemplateSpecializationKind() 10693 == TSK_ExplicitInstantiationDeclaration; 10694 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10695 REnd = Class->redecls_end(); 10696 R != REnd; ++R) { 10697 TemplateSpecializationKind TSK 10698 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10699 if (TSK == TSK_ExplicitInstantiationDeclaration) 10700 IsExplicitInstantiationDeclaration = true; 10701 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10702 IsExplicitInstantiationDeclaration = false; 10703 break; 10704 } 10705 } 10706 10707 if (IsExplicitInstantiationDeclaration) 10708 continue; 10709 } 10710 10711 // Mark all of the virtual members of this class as referenced, so 10712 // that we can build a vtable. Then, tell the AST consumer that a 10713 // vtable for this class is required. 10714 DefinedAnything = true; 10715 MarkVirtualMembersReferenced(Loc, Class); 10716 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10717 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10718 10719 // Optionally warn if we're emitting a weak vtable. 10720 if (Class->getLinkage() == ExternalLinkage && 10721 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10722 const FunctionDecl *KeyFunctionDef = 0; 10723 if (!KeyFunction || 10724 (KeyFunction->hasBody(KeyFunctionDef) && 10725 KeyFunctionDef->isInlined())) 10726 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10727 TSK_ExplicitInstantiationDefinition 10728 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10729 << Class; 10730 } 10731 } 10732 VTableUses.clear(); 10733 10734 return DefinedAnything; 10735} 10736 10737void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10738 const CXXRecordDecl *RD) { 10739 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10740 e = RD->method_end(); i != e; ++i) { 10741 CXXMethodDecl *MD = *i; 10742 10743 // C++ [basic.def.odr]p2: 10744 // [...] A virtual member function is used if it is not pure. [...] 10745 if (MD->isVirtual() && !MD->isPure()) 10746 MarkDeclarationReferenced(Loc, MD); 10747 } 10748 10749 // Only classes that have virtual bases need a VTT. 10750 if (RD->getNumVBases() == 0) 10751 return; 10752 10753 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10754 e = RD->bases_end(); i != e; ++i) { 10755 const CXXRecordDecl *Base = 10756 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10757 if (Base->getNumVBases() == 0) 10758 continue; 10759 MarkVirtualMembersReferenced(Loc, Base); 10760 } 10761} 10762 10763/// SetIvarInitializers - This routine builds initialization ASTs for the 10764/// Objective-C implementation whose ivars need be initialized. 10765void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10766 if (!getLangOptions().CPlusPlus) 10767 return; 10768 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10769 SmallVector<ObjCIvarDecl*, 8> ivars; 10770 CollectIvarsToConstructOrDestruct(OID, ivars); 10771 if (ivars.empty()) 10772 return; 10773 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10774 for (unsigned i = 0; i < ivars.size(); i++) { 10775 FieldDecl *Field = ivars[i]; 10776 if (Field->isInvalidDecl()) 10777 continue; 10778 10779 CXXCtorInitializer *Member; 10780 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10781 InitializationKind InitKind = 10782 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10783 10784 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10785 ExprResult MemberInit = 10786 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10787 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10788 // Note, MemberInit could actually come back empty if no initialization 10789 // is required (e.g., because it would call a trivial default constructor) 10790 if (!MemberInit.get() || MemberInit.isInvalid()) 10791 continue; 10792 10793 Member = 10794 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10795 SourceLocation(), 10796 MemberInit.takeAs<Expr>(), 10797 SourceLocation()); 10798 AllToInit.push_back(Member); 10799 10800 // Be sure that the destructor is accessible and is marked as referenced. 10801 if (const RecordType *RecordTy 10802 = Context.getBaseElementType(Field->getType()) 10803 ->getAs<RecordType>()) { 10804 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10805 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10806 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10807 CheckDestructorAccess(Field->getLocation(), Destructor, 10808 PDiag(diag::err_access_dtor_ivar) 10809 << Context.getBaseElementType(Field->getType())); 10810 } 10811 } 10812 } 10813 ObjCImplementation->setIvarInitializers(Context, 10814 AllToInit.data(), AllToInit.size()); 10815 } 10816} 10817 10818static 10819void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10820 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10821 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10822 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10823 Sema &S) { 10824 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10825 CE = Current.end(); 10826 if (Ctor->isInvalidDecl()) 10827 return; 10828 10829 const FunctionDecl *FNTarget = 0; 10830 CXXConstructorDecl *Target; 10831 10832 // We ignore the result here since if we don't have a body, Target will be 10833 // null below. 10834 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10835 Target 10836= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10837 10838 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10839 // Avoid dereferencing a null pointer here. 10840 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10841 10842 if (!Current.insert(Canonical)) 10843 return; 10844 10845 // We know that beyond here, we aren't chaining into a cycle. 10846 if (!Target || !Target->isDelegatingConstructor() || 10847 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10848 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10849 Valid.insert(*CI); 10850 Current.clear(); 10851 // We've hit a cycle. 10852 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10853 Current.count(TCanonical)) { 10854 // If we haven't diagnosed this cycle yet, do so now. 10855 if (!Invalid.count(TCanonical)) { 10856 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10857 diag::warn_delegating_ctor_cycle) 10858 << Ctor; 10859 10860 // Don't add a note for a function delegating directo to itself. 10861 if (TCanonical != Canonical) 10862 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10863 10864 CXXConstructorDecl *C = Target; 10865 while (C->getCanonicalDecl() != Canonical) { 10866 (void)C->getTargetConstructor()->hasBody(FNTarget); 10867 assert(FNTarget && "Ctor cycle through bodiless function"); 10868 10869 C 10870 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10871 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10872 } 10873 } 10874 10875 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10876 Invalid.insert(*CI); 10877 Current.clear(); 10878 } else { 10879 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10880 } 10881} 10882 10883 10884void Sema::CheckDelegatingCtorCycles() { 10885 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10886 10887 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10888 CE = Current.end(); 10889 10890 for (DelegatingCtorDeclsType::iterator 10891 I = DelegatingCtorDecls.begin(ExternalSource), 10892 E = DelegatingCtorDecls.end(); 10893 I != E; ++I) { 10894 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10895 } 10896 10897 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10898 (*CI)->setInvalidDecl(); 10899} 10900 10901/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10902Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10903 // Implicitly declared functions (e.g. copy constructors) are 10904 // __host__ __device__ 10905 if (D->isImplicit()) 10906 return CFT_HostDevice; 10907 10908 if (D->hasAttr<CUDAGlobalAttr>()) 10909 return CFT_Global; 10910 10911 if (D->hasAttr<CUDADeviceAttr>()) { 10912 if (D->hasAttr<CUDAHostAttr>()) 10913 return CFT_HostDevice; 10914 else 10915 return CFT_Device; 10916 } 10917 10918 return CFT_Host; 10919} 10920 10921bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10922 CUDAFunctionTarget CalleeTarget) { 10923 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10924 // Callable from the device only." 10925 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10926 return true; 10927 10928 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10929 // Callable from the host only." 10930 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10931 // Callable from the host only." 10932 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10933 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10934 return true; 10935 10936 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10937 return true; 10938 10939 return false; 10940} 10941