SemaDeclCXX.cpp revision f143ae9b68cdd40dfb120094baaa702b810eb52c
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/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377// function, once we already know that they have the same 378// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678/// \brief Get diagnostic %select index for tag kind for 679/// record diagnostic message. 680/// WARNING: Indexes apply to particular diagnostics only! 681/// 682/// \returns diagnostic %select index. 683static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 684 switch (Tag) { 685 case TTK_Struct: return 0; 686 case TTK_Interface: return 1; 687 case TTK_Class: return 2; 688 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 689 } 690} 691 692// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 693// the requirements of a constexpr function definition or a constexpr 694// constructor definition. If so, return true. If not, produce appropriate 695// diagnostics and return false. 696// 697// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 698bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 700 if (MD && MD->isInstance()) { 701 // C++11 [dcl.constexpr]p4: 702 // The definition of a constexpr constructor shall satisfy the following 703 // constraints: 704 // - the class shall not have any virtual base classes; 705 const CXXRecordDecl *RD = MD->getParent(); 706 if (RD->getNumVBases()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 708 << isa<CXXConstructorDecl>(NewFD) 709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 711 E = RD->vbases_end(); I != E; ++I) 712 Diag(I->getLocStart(), 713 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 714 return false; 715 } 716 } 717 718 if (!isa<CXXConstructorDecl>(NewFD)) { 719 // C++11 [dcl.constexpr]p3: 720 // The definition of a constexpr function shall satisfy the following 721 // constraints: 722 // - it shall not be virtual; 723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 724 if (Method && Method->isVirtual()) { 725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 726 727 // If it's not obvious why this function is virtual, find an overridden 728 // function which uses the 'virtual' keyword. 729 const CXXMethodDecl *WrittenVirtual = Method; 730 while (!WrittenVirtual->isVirtualAsWritten()) 731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 732 if (WrittenVirtual != Method) 733 Diag(WrittenVirtual->getLocation(), 734 diag::note_overridden_virtual_function); 735 return false; 736 } 737 738 // - its return type shall be a literal type; 739 QualType RT = NewFD->getResultType(); 740 if (!RT->isDependentType() && 741 RequireLiteralType(NewFD->getLocation(), RT, 742 diag::err_constexpr_non_literal_return)) 743 return false; 744 } 745 746 // - each of its parameter types shall be a literal type; 747 if (!CheckConstexprParameterTypes(*this, NewFD)) 748 return false; 749 750 return true; 751} 752 753/// Check the given declaration statement is legal within a constexpr function 754/// body. C++0x [dcl.constexpr]p3,p4. 755/// 756/// \return true if the body is OK, false if we have diagnosed a problem. 757static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 758 DeclStmt *DS) { 759 // C++0x [dcl.constexpr]p3 and p4: 760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 761 // contain only 762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 764 switch ((*DclIt)->getKind()) { 765 case Decl::StaticAssert: 766 case Decl::Using: 767 case Decl::UsingShadow: 768 case Decl::UsingDirective: 769 case Decl::UnresolvedUsingTypename: 770 // - static_assert-declarations 771 // - using-declarations, 772 // - using-directives, 773 continue; 774 775 case Decl::Typedef: 776 case Decl::TypeAlias: { 777 // - typedef declarations and alias-declarations that do not define 778 // classes or enumerations, 779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 780 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 781 // Don't allow variably-modified types in constexpr functions. 782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 784 << TL.getSourceRange() << TL.getType() 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 } 790 791 case Decl::Enum: 792 case Decl::CXXRecord: 793 // As an extension, we allow the declaration (but not the definition) of 794 // classes and enumerations in all declarations, not just in typedef and 795 // alias declarations. 796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 798 << isa<CXXConstructorDecl>(Dcl); 799 return false; 800 } 801 continue; 802 803 case Decl::Var: 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 808 default: 809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 810 << isa<CXXConstructorDecl>(Dcl); 811 return false; 812 } 813 } 814 815 return true; 816} 817 818/// Check that the given field is initialized within a constexpr constructor. 819/// 820/// \param Dcl The constexpr constructor being checked. 821/// \param Field The field being checked. This may be a member of an anonymous 822/// struct or union nested within the class being checked. 823/// \param Inits All declarations, including anonymous struct/union members and 824/// indirect members, for which any initialization was provided. 825/// \param Diagnosed Set to true if an error is produced. 826static void CheckConstexprCtorInitializer(Sema &SemaRef, 827 const FunctionDecl *Dcl, 828 FieldDecl *Field, 829 llvm::SmallSet<Decl*, 16> &Inits, 830 bool &Diagnosed) { 831 if (Field->isUnnamedBitfield()) 832 return; 833 834 if (Field->isAnonymousStructOrUnion() && 835 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 836 return; 837 838 if (!Inits.count(Field)) { 839 if (!Diagnosed) { 840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 841 Diagnosed = true; 842 } 843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 844 } else if (Field->isAnonymousStructOrUnion()) { 845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 847 I != E; ++I) 848 // If an anonymous union contains an anonymous struct of which any member 849 // is initialized, all members must be initialized. 850 if (!RD->isUnion() || Inits.count(*I)) 851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 852 } 853} 854 855/// Check the body for the given constexpr function declaration only contains 856/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 857/// 858/// \return true if the body is OK, false if we have diagnosed a problem. 859bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 860 if (isa<CXXTryStmt>(Body)) { 861 // C++11 [dcl.constexpr]p3: 862 // The definition of a constexpr function shall satisfy the following 863 // constraints: [...] 864 // - its function-body shall be = delete, = default, or a 865 // compound-statement 866 // 867 // C++11 [dcl.constexpr]p4: 868 // In the definition of a constexpr constructor, [...] 869 // - its function-body shall not be a function-try-block; 870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 871 << isa<CXXConstructorDecl>(Dcl); 872 return false; 873 } 874 875 // - its function-body shall be [...] a compound-statement that contains only 876 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 877 878 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 881 switch ((*BodyIt)->getStmtClass()) { 882 case Stmt::NullStmtClass: 883 // - null statements, 884 continue; 885 886 case Stmt::DeclStmtClass: 887 // - static_assert-declarations 888 // - using-declarations, 889 // - using-directives, 890 // - typedef declarations and alias-declarations that do not define 891 // classes or enumerations, 892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 893 return false; 894 continue; 895 896 case Stmt::ReturnStmtClass: 897 // - and exactly one return statement; 898 if (isa<CXXConstructorDecl>(Dcl)) 899 break; 900 901 ReturnStmts.push_back((*BodyIt)->getLocStart()); 902 continue; 903 904 default: 905 break; 906 } 907 908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 if (const CXXConstructorDecl *Constructor 914 = dyn_cast<CXXConstructorDecl>(Dcl)) { 915 const CXXRecordDecl *RD = Constructor->getParent(); 916 // DR1359: 917 // - every non-variant non-static data member and base class sub-object 918 // shall be initialized; 919 // - if the class is a non-empty union, or for each non-empty anonymous 920 // union member of a non-union class, exactly one non-static data member 921 // shall be initialized; 922 if (RD->isUnion()) { 923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 925 return false; 926 } 927 } else if (!Constructor->isDependentContext() && 928 !Constructor->isDelegatingConstructor()) { 929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 930 931 // Skip detailed checking if we have enough initializers, and we would 932 // allow at most one initializer per member. 933 bool AnyAnonStructUnionMembers = false; 934 unsigned Fields = 0; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I, ++Fields) { 937 if (I->isAnonymousStructOrUnion()) { 938 AnyAnonStructUnionMembers = true; 939 break; 940 } 941 } 942 if (AnyAnonStructUnionMembers || 943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 944 // Check initialization of non-static data members. Base classes are 945 // always initialized so do not need to be checked. Dependent bases 946 // might not have initializers in the member initializer list. 947 llvm::SmallSet<Decl*, 16> Inits; 948 for (CXXConstructorDecl::init_const_iterator 949 I = Constructor->init_begin(), E = Constructor->init_end(); 950 I != E; ++I) { 951 if (FieldDecl *FD = (*I)->getMember()) 952 Inits.insert(FD); 953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 954 Inits.insert(ID->chain_begin(), ID->chain_end()); 955 } 956 957 bool Diagnosed = false; 958 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 959 E = RD->field_end(); I != E; ++I) 960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 961 if (Diagnosed) 962 return false; 963 } 964 } 965 } else { 966 if (ReturnStmts.empty()) { 967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 968 return false; 969 } 970 if (ReturnStmts.size() > 1) { 971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 974 return false; 975 } 976 } 977 978 // C++11 [dcl.constexpr]p5: 979 // if no function argument values exist such that the function invocation 980 // substitution would produce a constant expression, the program is 981 // ill-formed; no diagnostic required. 982 // C++11 [dcl.constexpr]p3: 983 // - every constructor call and implicit conversion used in initializing the 984 // return value shall be one of those allowed in a constant expression. 985 // C++11 [dcl.constexpr]p4: 986 // - every constructor involved in initializing non-static data members and 987 // base class sub-objects shall be a constexpr constructor. 988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 991 << isa<CXXConstructorDecl>(Dcl); 992 for (size_t I = 0, N = Diags.size(); I != N; ++I) 993 Diag(Diags[I].first, Diags[I].second); 994 return false; 995 } 996 997 return true; 998} 999 1000/// isCurrentClassName - Determine whether the identifier II is the 1001/// name of the class type currently being defined. In the case of 1002/// nested classes, this will only return true if II is the name of 1003/// the innermost class. 1004bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1005 const CXXScopeSpec *SS) { 1006 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1007 1008 CXXRecordDecl *CurDecl; 1009 if (SS && SS->isSet() && !SS->isInvalid()) { 1010 DeclContext *DC = computeDeclContext(*SS, true); 1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1012 } else 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1014 1015 if (CurDecl && CurDecl->getIdentifier()) 1016 return &II == CurDecl->getIdentifier(); 1017 else 1018 return false; 1019} 1020 1021/// \brief Check the validity of a C++ base class specifier. 1022/// 1023/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1024/// and returns NULL otherwise. 1025CXXBaseSpecifier * 1026Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1027 SourceRange SpecifierRange, 1028 bool Virtual, AccessSpecifier Access, 1029 TypeSourceInfo *TInfo, 1030 SourceLocation EllipsisLoc) { 1031 QualType BaseType = TInfo->getType(); 1032 1033 // C++ [class.union]p1: 1034 // A union shall not have base classes. 1035 if (Class->isUnion()) { 1036 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1037 << SpecifierRange; 1038 return 0; 1039 } 1040 1041 if (EllipsisLoc.isValid() && 1042 !TInfo->getType()->containsUnexpandedParameterPack()) { 1043 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1044 << TInfo->getTypeLoc().getSourceRange(); 1045 EllipsisLoc = SourceLocation(); 1046 } 1047 1048 if (BaseType->isDependentType()) 1049 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1050 Class->getTagKind() == TTK_Class, 1051 Access, TInfo, EllipsisLoc); 1052 1053 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1054 1055 // Base specifiers must be record types. 1056 if (!BaseType->isRecordType()) { 1057 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1058 return 0; 1059 } 1060 1061 // C++ [class.union]p1: 1062 // A union shall not be used as a base class. 1063 if (BaseType->isUnionType()) { 1064 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1065 return 0; 1066 } 1067 1068 // C++ [class.derived]p2: 1069 // The class-name in a base-specifier shall not be an incompletely 1070 // defined class. 1071 if (RequireCompleteType(BaseLoc, BaseType, 1072 diag::err_incomplete_base_class, SpecifierRange)) { 1073 Class->setInvalidDecl(); 1074 return 0; 1075 } 1076 1077 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1078 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1079 assert(BaseDecl && "Record type has no declaration"); 1080 BaseDecl = BaseDecl->getDefinition(); 1081 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1082 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1083 assert(CXXBaseDecl && "Base type is not a C++ type"); 1084 1085 // C++ [class]p3: 1086 // If a class is marked final and it appears as a base-type-specifier in 1087 // base-clause, the program is ill-formed. 1088 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1089 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1090 << CXXBaseDecl->getDeclName(); 1091 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1092 << CXXBaseDecl->getDeclName(); 1093 return 0; 1094 } 1095 1096 if (BaseDecl->isInvalidDecl()) 1097 Class->setInvalidDecl(); 1098 1099 // Create the base specifier. 1100 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1101 Class->getTagKind() == TTK_Class, 1102 Access, TInfo, EllipsisLoc); 1103} 1104 1105/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1106/// one entry in the base class list of a class specifier, for 1107/// example: 1108/// class foo : public bar, virtual private baz { 1109/// 'public bar' and 'virtual private baz' are each base-specifiers. 1110BaseResult 1111Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1112 bool Virtual, AccessSpecifier Access, 1113 ParsedType basetype, SourceLocation BaseLoc, 1114 SourceLocation EllipsisLoc) { 1115 if (!classdecl) 1116 return true; 1117 1118 AdjustDeclIfTemplate(classdecl); 1119 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1120 if (!Class) 1121 return true; 1122 1123 TypeSourceInfo *TInfo = 0; 1124 GetTypeFromParser(basetype, &TInfo); 1125 1126 if (EllipsisLoc.isInvalid() && 1127 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1128 UPPC_BaseType)) 1129 return true; 1130 1131 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1132 Virtual, Access, TInfo, 1133 EllipsisLoc)) 1134 return BaseSpec; 1135 else 1136 Class->setInvalidDecl(); 1137 1138 return true; 1139} 1140 1141/// \brief Performs the actual work of attaching the given base class 1142/// specifiers to a C++ class. 1143bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1144 unsigned NumBases) { 1145 if (NumBases == 0) 1146 return false; 1147 1148 // Used to keep track of which base types we have already seen, so 1149 // that we can properly diagnose redundant direct base types. Note 1150 // that the key is always the unqualified canonical type of the base 1151 // class. 1152 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1153 1154 // Copy non-redundant base specifiers into permanent storage. 1155 unsigned NumGoodBases = 0; 1156 bool Invalid = false; 1157 for (unsigned idx = 0; idx < NumBases; ++idx) { 1158 QualType NewBaseType 1159 = Context.getCanonicalType(Bases[idx]->getType()); 1160 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1161 1162 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1163 if (KnownBase) { 1164 // C++ [class.mi]p3: 1165 // A class shall not be specified as a direct base class of a 1166 // derived class more than once. 1167 Diag(Bases[idx]->getLocStart(), 1168 diag::err_duplicate_base_class) 1169 << KnownBase->getType() 1170 << Bases[idx]->getSourceRange(); 1171 1172 // Delete the duplicate base class specifier; we're going to 1173 // overwrite its pointer later. 1174 Context.Deallocate(Bases[idx]); 1175 1176 Invalid = true; 1177 } else { 1178 // Okay, add this new base class. 1179 KnownBase = Bases[idx]; 1180 Bases[NumGoodBases++] = Bases[idx]; 1181 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1182 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1183 if (RD->hasAttr<WeakAttr>()) 1184 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1185 } 1186 } 1187 1188 // Attach the remaining base class specifiers to the derived class. 1189 Class->setBases(Bases, NumGoodBases); 1190 1191 // Delete the remaining (good) base class specifiers, since their 1192 // data has been copied into the CXXRecordDecl. 1193 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1194 Context.Deallocate(Bases[idx]); 1195 1196 return Invalid; 1197} 1198 1199/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1200/// class, after checking whether there are any duplicate base 1201/// classes. 1202void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1203 unsigned NumBases) { 1204 if (!ClassDecl || !Bases || !NumBases) 1205 return; 1206 1207 AdjustDeclIfTemplate(ClassDecl); 1208 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1209 (CXXBaseSpecifier**)(Bases), NumBases); 1210} 1211 1212static CXXRecordDecl *GetClassForType(QualType T) { 1213 if (const RecordType *RT = T->getAs<RecordType>()) 1214 return cast<CXXRecordDecl>(RT->getDecl()); 1215 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1216 return ICT->getDecl(); 1217 else 1218 return 0; 1219} 1220 1221/// \brief Determine whether the type \p Derived is a C++ class that is 1222/// derived from the type \p Base. 1223bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1224 if (!getLangOpts().CPlusPlus) 1225 return false; 1226 1227 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1228 if (!DerivedRD) 1229 return false; 1230 1231 CXXRecordDecl *BaseRD = GetClassForType(Base); 1232 if (!BaseRD) 1233 return false; 1234 1235 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1236 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1237} 1238 1239/// \brief Determine whether the type \p Derived is a C++ class that is 1240/// derived from the type \p Base. 1241bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1242 if (!getLangOpts().CPlusPlus) 1243 return false; 1244 1245 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1246 if (!DerivedRD) 1247 return false; 1248 1249 CXXRecordDecl *BaseRD = GetClassForType(Base); 1250 if (!BaseRD) 1251 return false; 1252 1253 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1254} 1255 1256void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1257 CXXCastPath &BasePathArray) { 1258 assert(BasePathArray.empty() && "Base path array must be empty!"); 1259 assert(Paths.isRecordingPaths() && "Must record paths!"); 1260 1261 const CXXBasePath &Path = Paths.front(); 1262 1263 // We first go backward and check if we have a virtual base. 1264 // FIXME: It would be better if CXXBasePath had the base specifier for 1265 // the nearest virtual base. 1266 unsigned Start = 0; 1267 for (unsigned I = Path.size(); I != 0; --I) { 1268 if (Path[I - 1].Base->isVirtual()) { 1269 Start = I - 1; 1270 break; 1271 } 1272 } 1273 1274 // Now add all bases. 1275 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1276 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1277} 1278 1279/// \brief Determine whether the given base path includes a virtual 1280/// base class. 1281bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1282 for (CXXCastPath::const_iterator B = BasePath.begin(), 1283 BEnd = BasePath.end(); 1284 B != BEnd; ++B) 1285 if ((*B)->isVirtual()) 1286 return true; 1287 1288 return false; 1289} 1290 1291/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1292/// conversion (where Derived and Base are class types) is 1293/// well-formed, meaning that the conversion is unambiguous (and 1294/// that all of the base classes are accessible). Returns true 1295/// and emits a diagnostic if the code is ill-formed, returns false 1296/// otherwise. Loc is the location where this routine should point to 1297/// if there is an error, and Range is the source range to highlight 1298/// if there is an error. 1299bool 1300Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1301 unsigned InaccessibleBaseID, 1302 unsigned AmbigiousBaseConvID, 1303 SourceLocation Loc, SourceRange Range, 1304 DeclarationName Name, 1305 CXXCastPath *BasePath) { 1306 // First, determine whether the path from Derived to Base is 1307 // ambiguous. This is slightly more expensive than checking whether 1308 // the Derived to Base conversion exists, because here we need to 1309 // explore multiple paths to determine if there is an ambiguity. 1310 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1311 /*DetectVirtual=*/false); 1312 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1313 assert(DerivationOkay && 1314 "Can only be used with a derived-to-base conversion"); 1315 (void)DerivationOkay; 1316 1317 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1318 if (InaccessibleBaseID) { 1319 // Check that the base class can be accessed. 1320 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1321 InaccessibleBaseID)) { 1322 case AR_inaccessible: 1323 return true; 1324 case AR_accessible: 1325 case AR_dependent: 1326 case AR_delayed: 1327 break; 1328 } 1329 } 1330 1331 // Build a base path if necessary. 1332 if (BasePath) 1333 BuildBasePathArray(Paths, *BasePath); 1334 return false; 1335 } 1336 1337 // We know that the derived-to-base conversion is ambiguous, and 1338 // we're going to produce a diagnostic. Perform the derived-to-base 1339 // search just one more time to compute all of the possible paths so 1340 // that we can print them out. This is more expensive than any of 1341 // the previous derived-to-base checks we've done, but at this point 1342 // performance isn't as much of an issue. 1343 Paths.clear(); 1344 Paths.setRecordingPaths(true); 1345 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1346 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1347 (void)StillOkay; 1348 1349 // Build up a textual representation of the ambiguous paths, e.g., 1350 // D -> B -> A, that will be used to illustrate the ambiguous 1351 // conversions in the diagnostic. We only print one of the paths 1352 // to each base class subobject. 1353 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1354 1355 Diag(Loc, AmbigiousBaseConvID) 1356 << Derived << Base << PathDisplayStr << Range << Name; 1357 return true; 1358} 1359 1360bool 1361Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1362 SourceLocation Loc, SourceRange Range, 1363 CXXCastPath *BasePath, 1364 bool IgnoreAccess) { 1365 return CheckDerivedToBaseConversion(Derived, Base, 1366 IgnoreAccess ? 0 1367 : diag::err_upcast_to_inaccessible_base, 1368 diag::err_ambiguous_derived_to_base_conv, 1369 Loc, Range, DeclarationName(), 1370 BasePath); 1371} 1372 1373 1374/// @brief Builds a string representing ambiguous paths from a 1375/// specific derived class to different subobjects of the same base 1376/// class. 1377/// 1378/// This function builds a string that can be used in error messages 1379/// to show the different paths that one can take through the 1380/// inheritance hierarchy to go from the derived class to different 1381/// subobjects of a base class. The result looks something like this: 1382/// @code 1383/// struct D -> struct B -> struct A 1384/// struct D -> struct C -> struct A 1385/// @endcode 1386std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1387 std::string PathDisplayStr; 1388 std::set<unsigned> DisplayedPaths; 1389 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1390 Path != Paths.end(); ++Path) { 1391 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1392 // We haven't displayed a path to this particular base 1393 // class subobject yet. 1394 PathDisplayStr += "\n "; 1395 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1396 for (CXXBasePath::const_iterator Element = Path->begin(); 1397 Element != Path->end(); ++Element) 1398 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1399 } 1400 } 1401 1402 return PathDisplayStr; 1403} 1404 1405//===----------------------------------------------------------------------===// 1406// C++ class member Handling 1407//===----------------------------------------------------------------------===// 1408 1409/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1410bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1411 SourceLocation ASLoc, 1412 SourceLocation ColonLoc, 1413 AttributeList *Attrs) { 1414 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1415 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1416 ASLoc, ColonLoc); 1417 CurContext->addHiddenDecl(ASDecl); 1418 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1419} 1420 1421/// CheckOverrideControl - Check C++11 override control semantics. 1422void Sema::CheckOverrideControl(Decl *D) { 1423 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1424 1425 // Do we know which functions this declaration might be overriding? 1426 bool OverridesAreKnown = !MD || 1427 (!MD->getParent()->hasAnyDependentBases() && 1428 !MD->getType()->isDependentType()); 1429 1430 if (!MD || !MD->isVirtual()) { 1431 if (OverridesAreKnown) { 1432 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1433 Diag(OA->getLocation(), 1434 diag::override_keyword_only_allowed_on_virtual_member_functions) 1435 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1436 D->dropAttr<OverrideAttr>(); 1437 } 1438 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1439 Diag(FA->getLocation(), 1440 diag::override_keyword_only_allowed_on_virtual_member_functions) 1441 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1442 D->dropAttr<FinalAttr>(); 1443 } 1444 } 1445 return; 1446 } 1447 1448 if (!OverridesAreKnown) 1449 return; 1450 1451 // C++11 [class.virtual]p5: 1452 // If a virtual function is marked with the virt-specifier override and 1453 // does not override a member function of a base class, the program is 1454 // ill-formed. 1455 bool HasOverriddenMethods = 1456 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1457 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1458 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1459 << MD->getDeclName(); 1460} 1461 1462/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1463/// function overrides a virtual member function marked 'final', according to 1464/// C++11 [class.virtual]p4. 1465bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1466 const CXXMethodDecl *Old) { 1467 if (!Old->hasAttr<FinalAttr>()) 1468 return false; 1469 1470 Diag(New->getLocation(), diag::err_final_function_overridden) 1471 << New->getDeclName(); 1472 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1473 return true; 1474} 1475 1476static bool InitializationHasSideEffects(const FieldDecl &FD) { 1477 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1478 // FIXME: Destruction of ObjC lifetime types has side-effects. 1479 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1480 return !RD->isCompleteDefinition() || 1481 !RD->hasTrivialDefaultConstructor() || 1482 !RD->hasTrivialDestructor(); 1483 return false; 1484} 1485 1486/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1487/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1488/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1489/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1490/// present (but parsing it has been deferred). 1491Decl * 1492Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1493 MultiTemplateParamsArg TemplateParameterLists, 1494 Expr *BW, const VirtSpecifiers &VS, 1495 InClassInitStyle InitStyle) { 1496 const DeclSpec &DS = D.getDeclSpec(); 1497 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1498 DeclarationName Name = NameInfo.getName(); 1499 SourceLocation Loc = NameInfo.getLoc(); 1500 1501 // For anonymous bitfields, the location should point to the type. 1502 if (Loc.isInvalid()) 1503 Loc = D.getLocStart(); 1504 1505 Expr *BitWidth = static_cast<Expr*>(BW); 1506 1507 assert(isa<CXXRecordDecl>(CurContext)); 1508 assert(!DS.isFriendSpecified()); 1509 1510 bool isFunc = D.isDeclarationOfFunction(); 1511 1512 // C++ 9.2p6: A member shall not be declared to have automatic storage 1513 // duration (auto, register) or with the extern storage-class-specifier. 1514 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1515 // data members and cannot be applied to names declared const or static, 1516 // and cannot be applied to reference members. 1517 switch (DS.getStorageClassSpec()) { 1518 case DeclSpec::SCS_unspecified: 1519 case DeclSpec::SCS_typedef: 1520 case DeclSpec::SCS_static: 1521 // FALL THROUGH. 1522 break; 1523 case DeclSpec::SCS_mutable: 1524 if (isFunc) { 1525 if (DS.getStorageClassSpecLoc().isValid()) 1526 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1527 else 1528 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1529 1530 // FIXME: It would be nicer if the keyword was ignored only for this 1531 // declarator. Otherwise we could get follow-up errors. 1532 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1533 } 1534 break; 1535 default: 1536 if (DS.getStorageClassSpecLoc().isValid()) 1537 Diag(DS.getStorageClassSpecLoc(), 1538 diag::err_storageclass_invalid_for_member); 1539 else 1540 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1541 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1542 } 1543 1544 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1545 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1546 !isFunc); 1547 1548 Decl *Member; 1549 if (isInstField) { 1550 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1551 1552 // Data members must have identifiers for names. 1553 if (!Name.isIdentifier()) { 1554 Diag(Loc, diag::err_bad_variable_name) 1555 << Name; 1556 return 0; 1557 } 1558 1559 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1560 1561 // Member field could not be with "template" keyword. 1562 // So TemplateParameterLists should be empty in this case. 1563 if (TemplateParameterLists.size()) { 1564 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1565 if (TemplateParams->size()) { 1566 // There is no such thing as a member field template. 1567 Diag(D.getIdentifierLoc(), diag::err_template_member) 1568 << II 1569 << SourceRange(TemplateParams->getTemplateLoc(), 1570 TemplateParams->getRAngleLoc()); 1571 } else { 1572 // There is an extraneous 'template<>' for this member. 1573 Diag(TemplateParams->getTemplateLoc(), 1574 diag::err_template_member_noparams) 1575 << II 1576 << SourceRange(TemplateParams->getTemplateLoc(), 1577 TemplateParams->getRAngleLoc()); 1578 } 1579 return 0; 1580 } 1581 1582 if (SS.isSet() && !SS.isInvalid()) { 1583 // The user provided a superfluous scope specifier inside a class 1584 // definition: 1585 // 1586 // class X { 1587 // int X::member; 1588 // }; 1589 if (DeclContext *DC = computeDeclContext(SS, false)) 1590 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1591 else 1592 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1593 << Name << SS.getRange(); 1594 1595 SS.clear(); 1596 } 1597 1598 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1599 InitStyle, AS); 1600 assert(Member && "HandleField never returns null"); 1601 } else { 1602 assert(InitStyle == ICIS_NoInit); 1603 1604 Member = HandleDeclarator(S, D, TemplateParameterLists); 1605 if (!Member) { 1606 return 0; 1607 } 1608 1609 // Non-instance-fields can't have a bitfield. 1610 if (BitWidth) { 1611 if (Member->isInvalidDecl()) { 1612 // don't emit another diagnostic. 1613 } else if (isa<VarDecl>(Member)) { 1614 // C++ 9.6p3: A bit-field shall not be a static member. 1615 // "static member 'A' cannot be a bit-field" 1616 Diag(Loc, diag::err_static_not_bitfield) 1617 << Name << BitWidth->getSourceRange(); 1618 } else if (isa<TypedefDecl>(Member)) { 1619 // "typedef member 'x' cannot be a bit-field" 1620 Diag(Loc, diag::err_typedef_not_bitfield) 1621 << Name << BitWidth->getSourceRange(); 1622 } else { 1623 // A function typedef ("typedef int f(); f a;"). 1624 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1625 Diag(Loc, diag::err_not_integral_type_bitfield) 1626 << Name << cast<ValueDecl>(Member)->getType() 1627 << BitWidth->getSourceRange(); 1628 } 1629 1630 BitWidth = 0; 1631 Member->setInvalidDecl(); 1632 } 1633 1634 Member->setAccess(AS); 1635 1636 // If we have declared a member function template, set the access of the 1637 // templated declaration as well. 1638 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1639 FunTmpl->getTemplatedDecl()->setAccess(AS); 1640 } 1641 1642 if (VS.isOverrideSpecified()) 1643 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1644 if (VS.isFinalSpecified()) 1645 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1646 1647 if (VS.getLastLocation().isValid()) { 1648 // Update the end location of a method that has a virt-specifiers. 1649 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1650 MD->setRangeEnd(VS.getLastLocation()); 1651 } 1652 1653 CheckOverrideControl(Member); 1654 1655 assert((Name || isInstField) && "No identifier for non-field ?"); 1656 1657 if (isInstField) { 1658 FieldDecl *FD = cast<FieldDecl>(Member); 1659 FieldCollector->Add(FD); 1660 1661 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1662 FD->getLocation()) 1663 != DiagnosticsEngine::Ignored) { 1664 // Remember all explicit private FieldDecls that have a name, no side 1665 // effects and are not part of a dependent type declaration. 1666 if (!FD->isImplicit() && FD->getDeclName() && 1667 FD->getAccess() == AS_private && 1668 !FD->hasAttr<UnusedAttr>() && 1669 !FD->getParent()->isDependentContext() && 1670 !InitializationHasSideEffects(*FD)) 1671 UnusedPrivateFields.insert(FD); 1672 } 1673 } 1674 1675 return Member; 1676} 1677 1678/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1679/// in-class initializer for a non-static C++ class member, and after 1680/// instantiating an in-class initializer in a class template. Such actions 1681/// are deferred until the class is complete. 1682void 1683Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1684 Expr *InitExpr) { 1685 FieldDecl *FD = cast<FieldDecl>(D); 1686 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1687 "must set init style when field is created"); 1688 1689 if (!InitExpr) { 1690 FD->setInvalidDecl(); 1691 FD->removeInClassInitializer(); 1692 return; 1693 } 1694 1695 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1696 FD->setInvalidDecl(); 1697 FD->removeInClassInitializer(); 1698 return; 1699 } 1700 1701 ExprResult Init = InitExpr; 1702 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1703 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1704 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1705 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1706 } 1707 Expr **Inits = &InitExpr; 1708 unsigned NumInits = 1; 1709 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1710 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1711 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1712 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1713 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1714 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1715 if (Init.isInvalid()) { 1716 FD->setInvalidDecl(); 1717 return; 1718 } 1719 1720 CheckImplicitConversions(Init.get(), InitLoc); 1721 } 1722 1723 // C++0x [class.base.init]p7: 1724 // The initialization of each base and member constitutes a 1725 // full-expression. 1726 Init = MaybeCreateExprWithCleanups(Init); 1727 if (Init.isInvalid()) { 1728 FD->setInvalidDecl(); 1729 return; 1730 } 1731 1732 InitExpr = Init.release(); 1733 1734 FD->setInClassInitializer(InitExpr); 1735} 1736 1737/// \brief Find the direct and/or virtual base specifiers that 1738/// correspond to the given base type, for use in base initialization 1739/// within a constructor. 1740static bool FindBaseInitializer(Sema &SemaRef, 1741 CXXRecordDecl *ClassDecl, 1742 QualType BaseType, 1743 const CXXBaseSpecifier *&DirectBaseSpec, 1744 const CXXBaseSpecifier *&VirtualBaseSpec) { 1745 // First, check for a direct base class. 1746 DirectBaseSpec = 0; 1747 for (CXXRecordDecl::base_class_const_iterator Base 1748 = ClassDecl->bases_begin(); 1749 Base != ClassDecl->bases_end(); ++Base) { 1750 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1751 // We found a direct base of this type. That's what we're 1752 // initializing. 1753 DirectBaseSpec = &*Base; 1754 break; 1755 } 1756 } 1757 1758 // Check for a virtual base class. 1759 // FIXME: We might be able to short-circuit this if we know in advance that 1760 // there are no virtual bases. 1761 VirtualBaseSpec = 0; 1762 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1763 // We haven't found a base yet; search the class hierarchy for a 1764 // virtual base class. 1765 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1766 /*DetectVirtual=*/false); 1767 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1768 BaseType, Paths)) { 1769 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1770 Path != Paths.end(); ++Path) { 1771 if (Path->back().Base->isVirtual()) { 1772 VirtualBaseSpec = Path->back().Base; 1773 break; 1774 } 1775 } 1776 } 1777 } 1778 1779 return DirectBaseSpec || VirtualBaseSpec; 1780} 1781 1782/// \brief Handle a C++ member initializer using braced-init-list syntax. 1783MemInitResult 1784Sema::ActOnMemInitializer(Decl *ConstructorD, 1785 Scope *S, 1786 CXXScopeSpec &SS, 1787 IdentifierInfo *MemberOrBase, 1788 ParsedType TemplateTypeTy, 1789 const DeclSpec &DS, 1790 SourceLocation IdLoc, 1791 Expr *InitList, 1792 SourceLocation EllipsisLoc) { 1793 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1794 DS, IdLoc, InitList, 1795 EllipsisLoc); 1796} 1797 1798/// \brief Handle a C++ member initializer using parentheses syntax. 1799MemInitResult 1800Sema::ActOnMemInitializer(Decl *ConstructorD, 1801 Scope *S, 1802 CXXScopeSpec &SS, 1803 IdentifierInfo *MemberOrBase, 1804 ParsedType TemplateTypeTy, 1805 const DeclSpec &DS, 1806 SourceLocation IdLoc, 1807 SourceLocation LParenLoc, 1808 Expr **Args, unsigned NumArgs, 1809 SourceLocation RParenLoc, 1810 SourceLocation EllipsisLoc) { 1811 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1812 llvm::makeArrayRef(Args, NumArgs), 1813 RParenLoc); 1814 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1815 DS, IdLoc, List, EllipsisLoc); 1816} 1817 1818namespace { 1819 1820// Callback to only accept typo corrections that can be a valid C++ member 1821// intializer: either a non-static field member or a base class. 1822class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1823 public: 1824 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1825 : ClassDecl(ClassDecl) {} 1826 1827 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1828 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1829 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1830 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1831 else 1832 return isa<TypeDecl>(ND); 1833 } 1834 return false; 1835 } 1836 1837 private: 1838 CXXRecordDecl *ClassDecl; 1839}; 1840 1841} 1842 1843/// \brief Handle a C++ member initializer. 1844MemInitResult 1845Sema::BuildMemInitializer(Decl *ConstructorD, 1846 Scope *S, 1847 CXXScopeSpec &SS, 1848 IdentifierInfo *MemberOrBase, 1849 ParsedType TemplateTypeTy, 1850 const DeclSpec &DS, 1851 SourceLocation IdLoc, 1852 Expr *Init, 1853 SourceLocation EllipsisLoc) { 1854 if (!ConstructorD) 1855 return true; 1856 1857 AdjustDeclIfTemplate(ConstructorD); 1858 1859 CXXConstructorDecl *Constructor 1860 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1861 if (!Constructor) { 1862 // The user wrote a constructor initializer on a function that is 1863 // not a C++ constructor. Ignore the error for now, because we may 1864 // have more member initializers coming; we'll diagnose it just 1865 // once in ActOnMemInitializers. 1866 return true; 1867 } 1868 1869 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1870 1871 // C++ [class.base.init]p2: 1872 // Names in a mem-initializer-id are looked up in the scope of the 1873 // constructor's class and, if not found in that scope, are looked 1874 // up in the scope containing the constructor's definition. 1875 // [Note: if the constructor's class contains a member with the 1876 // same name as a direct or virtual base class of the class, a 1877 // mem-initializer-id naming the member or base class and composed 1878 // of a single identifier refers to the class member. A 1879 // mem-initializer-id for the hidden base class may be specified 1880 // using a qualified name. ] 1881 if (!SS.getScopeRep() && !TemplateTypeTy) { 1882 // Look for a member, first. 1883 DeclContext::lookup_result Result 1884 = ClassDecl->lookup(MemberOrBase); 1885 if (Result.first != Result.second) { 1886 ValueDecl *Member; 1887 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1888 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1889 if (EllipsisLoc.isValid()) 1890 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1891 << MemberOrBase 1892 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1893 1894 return BuildMemberInitializer(Member, Init, IdLoc); 1895 } 1896 } 1897 } 1898 // It didn't name a member, so see if it names a class. 1899 QualType BaseType; 1900 TypeSourceInfo *TInfo = 0; 1901 1902 if (TemplateTypeTy) { 1903 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1904 } else if (DS.getTypeSpecType() == TST_decltype) { 1905 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1906 } else { 1907 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1908 LookupParsedName(R, S, &SS); 1909 1910 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1911 if (!TyD) { 1912 if (R.isAmbiguous()) return true; 1913 1914 // We don't want access-control diagnostics here. 1915 R.suppressDiagnostics(); 1916 1917 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1918 bool NotUnknownSpecialization = false; 1919 DeclContext *DC = computeDeclContext(SS, false); 1920 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1921 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1922 1923 if (!NotUnknownSpecialization) { 1924 // When the scope specifier can refer to a member of an unknown 1925 // specialization, we take it as a type name. 1926 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1927 SS.getWithLocInContext(Context), 1928 *MemberOrBase, IdLoc); 1929 if (BaseType.isNull()) 1930 return true; 1931 1932 R.clear(); 1933 R.setLookupName(MemberOrBase); 1934 } 1935 } 1936 1937 // If no results were found, try to correct typos. 1938 TypoCorrection Corr; 1939 MemInitializerValidatorCCC Validator(ClassDecl); 1940 if (R.empty() && BaseType.isNull() && 1941 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1942 Validator, ClassDecl))) { 1943 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1944 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1945 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1946 // We have found a non-static data member with a similar 1947 // name to what was typed; complain and initialize that 1948 // member. 1949 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1950 << MemberOrBase << true << CorrectedQuotedStr 1951 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1952 Diag(Member->getLocation(), diag::note_previous_decl) 1953 << CorrectedQuotedStr; 1954 1955 return BuildMemberInitializer(Member, Init, IdLoc); 1956 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1957 const CXXBaseSpecifier *DirectBaseSpec; 1958 const CXXBaseSpecifier *VirtualBaseSpec; 1959 if (FindBaseInitializer(*this, ClassDecl, 1960 Context.getTypeDeclType(Type), 1961 DirectBaseSpec, VirtualBaseSpec)) { 1962 // We have found a direct or virtual base class with a 1963 // similar name to what was typed; complain and initialize 1964 // that base class. 1965 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1966 << MemberOrBase << false << CorrectedQuotedStr 1967 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1968 1969 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1970 : VirtualBaseSpec; 1971 Diag(BaseSpec->getLocStart(), 1972 diag::note_base_class_specified_here) 1973 << BaseSpec->getType() 1974 << BaseSpec->getSourceRange(); 1975 1976 TyD = Type; 1977 } 1978 } 1979 } 1980 1981 if (!TyD && BaseType.isNull()) { 1982 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1983 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1984 return true; 1985 } 1986 } 1987 1988 if (BaseType.isNull()) { 1989 BaseType = Context.getTypeDeclType(TyD); 1990 if (SS.isSet()) { 1991 NestedNameSpecifier *Qualifier = 1992 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1993 1994 // FIXME: preserve source range information 1995 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1996 } 1997 } 1998 } 1999 2000 if (!TInfo) 2001 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2002 2003 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2004} 2005 2006/// Checks a member initializer expression for cases where reference (or 2007/// pointer) members are bound to by-value parameters (or their addresses). 2008static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2009 Expr *Init, 2010 SourceLocation IdLoc) { 2011 QualType MemberTy = Member->getType(); 2012 2013 // We only handle pointers and references currently. 2014 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2015 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2016 return; 2017 2018 const bool IsPointer = MemberTy->isPointerType(); 2019 if (IsPointer) { 2020 if (const UnaryOperator *Op 2021 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2022 // The only case we're worried about with pointers requires taking the 2023 // address. 2024 if (Op->getOpcode() != UO_AddrOf) 2025 return; 2026 2027 Init = Op->getSubExpr(); 2028 } else { 2029 // We only handle address-of expression initializers for pointers. 2030 return; 2031 } 2032 } 2033 2034 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2035 // Taking the address of a temporary will be diagnosed as a hard error. 2036 if (IsPointer) 2037 return; 2038 2039 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2040 << Member << Init->getSourceRange(); 2041 } else if (const DeclRefExpr *DRE 2042 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2043 // We only warn when referring to a non-reference parameter declaration. 2044 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2045 if (!Parameter || Parameter->getType()->isReferenceType()) 2046 return; 2047 2048 S.Diag(Init->getExprLoc(), 2049 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2050 : diag::warn_bind_ref_member_to_parameter) 2051 << Member << Parameter << Init->getSourceRange(); 2052 } else { 2053 // Other initializers are fine. 2054 return; 2055 } 2056 2057 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2058 << (unsigned)IsPointer; 2059} 2060 2061namespace { 2062 class UninitializedFieldVisitor 2063 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2064 Sema &S; 2065 ValueDecl *VD; 2066 public: 2067 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2068 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2069 S(S), VD(VD) { 2070 } 2071 2072 void HandleExpr(Expr *E) { 2073 if (!E) return; 2074 2075 // Expressions like x(x) sometimes lack the surrounding expressions 2076 // but need to be checked anyways. 2077 HandleValue(E); 2078 Visit(E); 2079 } 2080 2081 void HandleValue(Expr *E) { 2082 E = E->IgnoreParens(); 2083 2084 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2085 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2086 return; 2087 Expr *Base = E; 2088 while (isa<MemberExpr>(Base)) { 2089 ME = dyn_cast<MemberExpr>(Base); 2090 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2091 if (VarD->hasGlobalStorage()) 2092 return; 2093 Base = ME->getBase(); 2094 } 2095 2096 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2097 unsigned diag = VD->getType()->isReferenceType() 2098 ? diag::warn_reference_field_is_uninit 2099 : diag::warn_field_is_uninit; 2100 S.Diag(ME->getExprLoc(), diag); 2101 return; 2102 } 2103 } 2104 2105 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2106 HandleValue(CO->getTrueExpr()); 2107 HandleValue(CO->getFalseExpr()); 2108 return; 2109 } 2110 2111 if (BinaryConditionalOperator *BCO = 2112 dyn_cast<BinaryConditionalOperator>(E)) { 2113 HandleValue(BCO->getCommon()); 2114 HandleValue(BCO->getFalseExpr()); 2115 return; 2116 } 2117 2118 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2119 switch (BO->getOpcode()) { 2120 default: 2121 return; 2122 case(BO_PtrMemD): 2123 case(BO_PtrMemI): 2124 HandleValue(BO->getLHS()); 2125 return; 2126 case(BO_Comma): 2127 HandleValue(BO->getRHS()); 2128 return; 2129 } 2130 } 2131 } 2132 2133 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2134 if (E->getCastKind() == CK_LValueToRValue) 2135 HandleValue(E->getSubExpr()); 2136 2137 Inherited::VisitImplicitCastExpr(E); 2138 } 2139 2140 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2141 Expr *Callee = E->getCallee(); 2142 if (isa<MemberExpr>(Callee)) 2143 HandleValue(Callee); 2144 2145 Inherited::VisitCXXMemberCallExpr(E); 2146 } 2147 }; 2148 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2149 ValueDecl *VD) { 2150 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2151 } 2152} // namespace 2153 2154MemInitResult 2155Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2156 SourceLocation IdLoc) { 2157 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2158 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2159 assert((DirectMember || IndirectMember) && 2160 "Member must be a FieldDecl or IndirectFieldDecl"); 2161 2162 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2163 return true; 2164 2165 if (Member->isInvalidDecl()) 2166 return true; 2167 2168 // Diagnose value-uses of fields to initialize themselves, e.g. 2169 // foo(foo) 2170 // where foo is not also a parameter to the constructor. 2171 // TODO: implement -Wuninitialized and fold this into that framework. 2172 Expr **Args; 2173 unsigned NumArgs; 2174 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2175 Args = ParenList->getExprs(); 2176 NumArgs = ParenList->getNumExprs(); 2177 } else { 2178 InitListExpr *InitList = cast<InitListExpr>(Init); 2179 Args = InitList->getInits(); 2180 NumArgs = InitList->getNumInits(); 2181 } 2182 2183 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2184 != DiagnosticsEngine::Ignored) 2185 for (unsigned i = 0; i < NumArgs; ++i) 2186 // FIXME: Warn about the case when other fields are used before being 2187 // uninitialized. For example, let this field be the i'th field. When 2188 // initializing the i'th field, throw a warning if any of the >= i'th 2189 // fields are used, as they are not yet initialized. 2190 // Right now we are only handling the case where the i'th field uses 2191 // itself in its initializer. 2192 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2193 2194 SourceRange InitRange = Init->getSourceRange(); 2195 2196 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2197 // Can't check initialization for a member of dependent type or when 2198 // any of the arguments are type-dependent expressions. 2199 DiscardCleanupsInEvaluationContext(); 2200 } else { 2201 bool InitList = false; 2202 if (isa<InitListExpr>(Init)) { 2203 InitList = true; 2204 Args = &Init; 2205 NumArgs = 1; 2206 2207 if (isStdInitializerList(Member->getType(), 0)) { 2208 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2209 << /*at end of ctor*/1 << InitRange; 2210 } 2211 } 2212 2213 // Initialize the member. 2214 InitializedEntity MemberEntity = 2215 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2216 : InitializedEntity::InitializeMember(IndirectMember, 0); 2217 InitializationKind Kind = 2218 InitList ? InitializationKind::CreateDirectList(IdLoc) 2219 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2220 InitRange.getEnd()); 2221 2222 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2223 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2224 MultiExprArg(Args, NumArgs), 2225 0); 2226 if (MemberInit.isInvalid()) 2227 return true; 2228 2229 CheckImplicitConversions(MemberInit.get(), 2230 InitRange.getBegin()); 2231 2232 // C++0x [class.base.init]p7: 2233 // The initialization of each base and member constitutes a 2234 // full-expression. 2235 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2236 if (MemberInit.isInvalid()) 2237 return true; 2238 2239 // If we are in a dependent context, template instantiation will 2240 // perform this type-checking again. Just save the arguments that we 2241 // received. 2242 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2243 // of the information that we have about the member 2244 // initializer. However, deconstructing the ASTs is a dicey process, 2245 // and this approach is far more likely to get the corner cases right. 2246 if (CurContext->isDependentContext()) { 2247 // The existing Init will do fine. 2248 } else { 2249 Init = MemberInit.get(); 2250 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2251 } 2252 } 2253 2254 if (DirectMember) { 2255 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2256 InitRange.getBegin(), Init, 2257 InitRange.getEnd()); 2258 } else { 2259 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2260 InitRange.getBegin(), Init, 2261 InitRange.getEnd()); 2262 } 2263} 2264 2265MemInitResult 2266Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2267 CXXRecordDecl *ClassDecl) { 2268 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2269 if (!LangOpts.CPlusPlus0x) 2270 return Diag(NameLoc, diag::err_delegating_ctor) 2271 << TInfo->getTypeLoc().getLocalSourceRange(); 2272 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2273 2274 bool InitList = true; 2275 Expr **Args = &Init; 2276 unsigned NumArgs = 1; 2277 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2278 InitList = false; 2279 Args = ParenList->getExprs(); 2280 NumArgs = ParenList->getNumExprs(); 2281 } 2282 2283 SourceRange InitRange = Init->getSourceRange(); 2284 // Initialize the object. 2285 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2286 QualType(ClassDecl->getTypeForDecl(), 0)); 2287 InitializationKind Kind = 2288 InitList ? InitializationKind::CreateDirectList(NameLoc) 2289 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2290 InitRange.getEnd()); 2291 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2292 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2293 MultiExprArg(Args, NumArgs), 2294 0); 2295 if (DelegationInit.isInvalid()) 2296 return true; 2297 2298 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2299 "Delegating constructor with no target?"); 2300 2301 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2302 2303 // C++0x [class.base.init]p7: 2304 // The initialization of each base and member constitutes a 2305 // full-expression. 2306 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2307 if (DelegationInit.isInvalid()) 2308 return true; 2309 2310 // If we are in a dependent context, template instantiation will 2311 // perform this type-checking again. Just save the arguments that we 2312 // received in a ParenListExpr. 2313 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2314 // of the information that we have about the base 2315 // initializer. However, deconstructing the ASTs is a dicey process, 2316 // and this approach is far more likely to get the corner cases right. 2317 if (CurContext->isDependentContext()) 2318 DelegationInit = Owned(Init); 2319 2320 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2321 DelegationInit.takeAs<Expr>(), 2322 InitRange.getEnd()); 2323} 2324 2325MemInitResult 2326Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2327 Expr *Init, CXXRecordDecl *ClassDecl, 2328 SourceLocation EllipsisLoc) { 2329 SourceLocation BaseLoc 2330 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2331 2332 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2333 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2334 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2335 2336 // C++ [class.base.init]p2: 2337 // [...] Unless the mem-initializer-id names a nonstatic data 2338 // member of the constructor's class or a direct or virtual base 2339 // of that class, the mem-initializer is ill-formed. A 2340 // mem-initializer-list can initialize a base class using any 2341 // name that denotes that base class type. 2342 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2343 2344 SourceRange InitRange = Init->getSourceRange(); 2345 if (EllipsisLoc.isValid()) { 2346 // This is a pack expansion. 2347 if (!BaseType->containsUnexpandedParameterPack()) { 2348 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2349 << SourceRange(BaseLoc, InitRange.getEnd()); 2350 2351 EllipsisLoc = SourceLocation(); 2352 } 2353 } else { 2354 // Check for any unexpanded parameter packs. 2355 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2356 return true; 2357 2358 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2359 return true; 2360 } 2361 2362 // Check for direct and virtual base classes. 2363 const CXXBaseSpecifier *DirectBaseSpec = 0; 2364 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2365 if (!Dependent) { 2366 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2367 BaseType)) 2368 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2369 2370 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2371 VirtualBaseSpec); 2372 2373 // C++ [base.class.init]p2: 2374 // Unless the mem-initializer-id names a nonstatic data member of the 2375 // constructor's class or a direct or virtual base of that class, the 2376 // mem-initializer is ill-formed. 2377 if (!DirectBaseSpec && !VirtualBaseSpec) { 2378 // If the class has any dependent bases, then it's possible that 2379 // one of those types will resolve to the same type as 2380 // BaseType. Therefore, just treat this as a dependent base 2381 // class initialization. FIXME: Should we try to check the 2382 // initialization anyway? It seems odd. 2383 if (ClassDecl->hasAnyDependentBases()) 2384 Dependent = true; 2385 else 2386 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2387 << BaseType << Context.getTypeDeclType(ClassDecl) 2388 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2389 } 2390 } 2391 2392 if (Dependent) { 2393 DiscardCleanupsInEvaluationContext(); 2394 2395 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2396 /*IsVirtual=*/false, 2397 InitRange.getBegin(), Init, 2398 InitRange.getEnd(), EllipsisLoc); 2399 } 2400 2401 // C++ [base.class.init]p2: 2402 // If a mem-initializer-id is ambiguous because it designates both 2403 // a direct non-virtual base class and an inherited virtual base 2404 // class, the mem-initializer is ill-formed. 2405 if (DirectBaseSpec && VirtualBaseSpec) 2406 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2407 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2408 2409 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2410 if (!BaseSpec) 2411 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2412 2413 // Initialize the base. 2414 bool InitList = true; 2415 Expr **Args = &Init; 2416 unsigned NumArgs = 1; 2417 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2418 InitList = false; 2419 Args = ParenList->getExprs(); 2420 NumArgs = ParenList->getNumExprs(); 2421 } 2422 2423 InitializedEntity BaseEntity = 2424 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2425 InitializationKind Kind = 2426 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2427 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2428 InitRange.getEnd()); 2429 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2430 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2431 MultiExprArg(Args, NumArgs), 0); 2432 if (BaseInit.isInvalid()) 2433 return true; 2434 2435 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2436 2437 // C++0x [class.base.init]p7: 2438 // The initialization of each base and member constitutes a 2439 // full-expression. 2440 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2441 if (BaseInit.isInvalid()) 2442 return true; 2443 2444 // If we are in a dependent context, template instantiation will 2445 // perform this type-checking again. Just save the arguments that we 2446 // received in a ParenListExpr. 2447 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2448 // of the information that we have about the base 2449 // initializer. However, deconstructing the ASTs is a dicey process, 2450 // and this approach is far more likely to get the corner cases right. 2451 if (CurContext->isDependentContext()) 2452 BaseInit = Owned(Init); 2453 2454 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2455 BaseSpec->isVirtual(), 2456 InitRange.getBegin(), 2457 BaseInit.takeAs<Expr>(), 2458 InitRange.getEnd(), EllipsisLoc); 2459} 2460 2461// Create a static_cast\<T&&>(expr). 2462static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2463 QualType ExprType = E->getType(); 2464 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2465 SourceLocation ExprLoc = E->getLocStart(); 2466 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2467 TargetType, ExprLoc); 2468 2469 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2470 SourceRange(ExprLoc, ExprLoc), 2471 E->getSourceRange()).take(); 2472} 2473 2474/// ImplicitInitializerKind - How an implicit base or member initializer should 2475/// initialize its base or member. 2476enum ImplicitInitializerKind { 2477 IIK_Default, 2478 IIK_Copy, 2479 IIK_Move 2480}; 2481 2482static bool 2483BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2484 ImplicitInitializerKind ImplicitInitKind, 2485 CXXBaseSpecifier *BaseSpec, 2486 bool IsInheritedVirtualBase, 2487 CXXCtorInitializer *&CXXBaseInit) { 2488 InitializedEntity InitEntity 2489 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2490 IsInheritedVirtualBase); 2491 2492 ExprResult BaseInit; 2493 2494 switch (ImplicitInitKind) { 2495 case IIK_Default: { 2496 InitializationKind InitKind 2497 = InitializationKind::CreateDefault(Constructor->getLocation()); 2498 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2499 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2500 break; 2501 } 2502 2503 case IIK_Move: 2504 case IIK_Copy: { 2505 bool Moving = ImplicitInitKind == IIK_Move; 2506 ParmVarDecl *Param = Constructor->getParamDecl(0); 2507 QualType ParamType = Param->getType().getNonReferenceType(); 2508 2509 Expr *CopyCtorArg = 2510 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2511 SourceLocation(), Param, false, 2512 Constructor->getLocation(), ParamType, 2513 VK_LValue, 0); 2514 2515 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2516 2517 // Cast to the base class to avoid ambiguities. 2518 QualType ArgTy = 2519 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2520 ParamType.getQualifiers()); 2521 2522 if (Moving) { 2523 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2524 } 2525 2526 CXXCastPath BasePath; 2527 BasePath.push_back(BaseSpec); 2528 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2529 CK_UncheckedDerivedToBase, 2530 Moving ? VK_XValue : VK_LValue, 2531 &BasePath).take(); 2532 2533 InitializationKind InitKind 2534 = InitializationKind::CreateDirect(Constructor->getLocation(), 2535 SourceLocation(), SourceLocation()); 2536 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2537 &CopyCtorArg, 1); 2538 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2539 MultiExprArg(&CopyCtorArg, 1)); 2540 break; 2541 } 2542 } 2543 2544 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2545 if (BaseInit.isInvalid()) 2546 return true; 2547 2548 CXXBaseInit = 2549 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2550 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2551 SourceLocation()), 2552 BaseSpec->isVirtual(), 2553 SourceLocation(), 2554 BaseInit.takeAs<Expr>(), 2555 SourceLocation(), 2556 SourceLocation()); 2557 2558 return false; 2559} 2560 2561static bool RefersToRValueRef(Expr *MemRef) { 2562 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2563 return Referenced->getType()->isRValueReferenceType(); 2564} 2565 2566static bool 2567BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2568 ImplicitInitializerKind ImplicitInitKind, 2569 FieldDecl *Field, IndirectFieldDecl *Indirect, 2570 CXXCtorInitializer *&CXXMemberInit) { 2571 if (Field->isInvalidDecl()) 2572 return true; 2573 2574 SourceLocation Loc = Constructor->getLocation(); 2575 2576 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2577 bool Moving = ImplicitInitKind == IIK_Move; 2578 ParmVarDecl *Param = Constructor->getParamDecl(0); 2579 QualType ParamType = Param->getType().getNonReferenceType(); 2580 2581 // Suppress copying zero-width bitfields. 2582 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2583 return false; 2584 2585 Expr *MemberExprBase = 2586 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2587 SourceLocation(), Param, false, 2588 Loc, ParamType, VK_LValue, 0); 2589 2590 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2591 2592 if (Moving) { 2593 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2594 } 2595 2596 // Build a reference to this field within the parameter. 2597 CXXScopeSpec SS; 2598 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2599 Sema::LookupMemberName); 2600 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2601 : cast<ValueDecl>(Field), AS_public); 2602 MemberLookup.resolveKind(); 2603 ExprResult CtorArg 2604 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2605 ParamType, Loc, 2606 /*IsArrow=*/false, 2607 SS, 2608 /*TemplateKWLoc=*/SourceLocation(), 2609 /*FirstQualifierInScope=*/0, 2610 MemberLookup, 2611 /*TemplateArgs=*/0); 2612 if (CtorArg.isInvalid()) 2613 return true; 2614 2615 // C++11 [class.copy]p15: 2616 // - if a member m has rvalue reference type T&&, it is direct-initialized 2617 // with static_cast<T&&>(x.m); 2618 if (RefersToRValueRef(CtorArg.get())) { 2619 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2620 } 2621 2622 // When the field we are copying is an array, create index variables for 2623 // each dimension of the array. We use these index variables to subscript 2624 // the source array, and other clients (e.g., CodeGen) will perform the 2625 // necessary iteration with these index variables. 2626 SmallVector<VarDecl *, 4> IndexVariables; 2627 QualType BaseType = Field->getType(); 2628 QualType SizeType = SemaRef.Context.getSizeType(); 2629 bool InitializingArray = false; 2630 while (const ConstantArrayType *Array 2631 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2632 InitializingArray = true; 2633 // Create the iteration variable for this array index. 2634 IdentifierInfo *IterationVarName = 0; 2635 { 2636 SmallString<8> Str; 2637 llvm::raw_svector_ostream OS(Str); 2638 OS << "__i" << IndexVariables.size(); 2639 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2640 } 2641 VarDecl *IterationVar 2642 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2643 IterationVarName, SizeType, 2644 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2645 SC_None, SC_None); 2646 IndexVariables.push_back(IterationVar); 2647 2648 // Create a reference to the iteration variable. 2649 ExprResult IterationVarRef 2650 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2651 assert(!IterationVarRef.isInvalid() && 2652 "Reference to invented variable cannot fail!"); 2653 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2654 assert(!IterationVarRef.isInvalid() && 2655 "Conversion of invented variable cannot fail!"); 2656 2657 // Subscript the array with this iteration variable. 2658 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2659 IterationVarRef.take(), 2660 Loc); 2661 if (CtorArg.isInvalid()) 2662 return true; 2663 2664 BaseType = Array->getElementType(); 2665 } 2666 2667 // The array subscript expression is an lvalue, which is wrong for moving. 2668 if (Moving && InitializingArray) 2669 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2670 2671 // Construct the entity that we will be initializing. For an array, this 2672 // will be first element in the array, which may require several levels 2673 // of array-subscript entities. 2674 SmallVector<InitializedEntity, 4> Entities; 2675 Entities.reserve(1 + IndexVariables.size()); 2676 if (Indirect) 2677 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2678 else 2679 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2680 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2681 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2682 0, 2683 Entities.back())); 2684 2685 // Direct-initialize to use the copy constructor. 2686 InitializationKind InitKind = 2687 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2688 2689 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2690 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2691 &CtorArgE, 1); 2692 2693 ExprResult MemberInit 2694 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2695 MultiExprArg(&CtorArgE, 1)); 2696 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2697 if (MemberInit.isInvalid()) 2698 return true; 2699 2700 if (Indirect) { 2701 assert(IndexVariables.size() == 0 && 2702 "Indirect field improperly initialized"); 2703 CXXMemberInit 2704 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2705 Loc, Loc, 2706 MemberInit.takeAs<Expr>(), 2707 Loc); 2708 } else 2709 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2710 Loc, MemberInit.takeAs<Expr>(), 2711 Loc, 2712 IndexVariables.data(), 2713 IndexVariables.size()); 2714 return false; 2715 } 2716 2717 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2718 2719 QualType FieldBaseElementType = 2720 SemaRef.Context.getBaseElementType(Field->getType()); 2721 2722 if (FieldBaseElementType->isRecordType()) { 2723 InitializedEntity InitEntity 2724 = Indirect? InitializedEntity::InitializeMember(Indirect) 2725 : InitializedEntity::InitializeMember(Field); 2726 InitializationKind InitKind = 2727 InitializationKind::CreateDefault(Loc); 2728 2729 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2730 ExprResult MemberInit = 2731 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2732 2733 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2734 if (MemberInit.isInvalid()) 2735 return true; 2736 2737 if (Indirect) 2738 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2739 Indirect, Loc, 2740 Loc, 2741 MemberInit.get(), 2742 Loc); 2743 else 2744 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2745 Field, Loc, Loc, 2746 MemberInit.get(), 2747 Loc); 2748 return false; 2749 } 2750 2751 if (!Field->getParent()->isUnion()) { 2752 if (FieldBaseElementType->isReferenceType()) { 2753 SemaRef.Diag(Constructor->getLocation(), 2754 diag::err_uninitialized_member_in_ctor) 2755 << (int)Constructor->isImplicit() 2756 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2757 << 0 << Field->getDeclName(); 2758 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2759 return true; 2760 } 2761 2762 if (FieldBaseElementType.isConstQualified()) { 2763 SemaRef.Diag(Constructor->getLocation(), 2764 diag::err_uninitialized_member_in_ctor) 2765 << (int)Constructor->isImplicit() 2766 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2767 << 1 << Field->getDeclName(); 2768 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2769 return true; 2770 } 2771 } 2772 2773 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2774 FieldBaseElementType->isObjCRetainableType() && 2775 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2776 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2777 // ARC: 2778 // Default-initialize Objective-C pointers to NULL. 2779 CXXMemberInit 2780 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2781 Loc, Loc, 2782 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2783 Loc); 2784 return false; 2785 } 2786 2787 // Nothing to initialize. 2788 CXXMemberInit = 0; 2789 return false; 2790} 2791 2792namespace { 2793struct BaseAndFieldInfo { 2794 Sema &S; 2795 CXXConstructorDecl *Ctor; 2796 bool AnyErrorsInInits; 2797 ImplicitInitializerKind IIK; 2798 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2799 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2800 2801 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2802 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2803 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2804 if (Generated && Ctor->isCopyConstructor()) 2805 IIK = IIK_Copy; 2806 else if (Generated && Ctor->isMoveConstructor()) 2807 IIK = IIK_Move; 2808 else 2809 IIK = IIK_Default; 2810 } 2811 2812 bool isImplicitCopyOrMove() const { 2813 switch (IIK) { 2814 case IIK_Copy: 2815 case IIK_Move: 2816 return true; 2817 2818 case IIK_Default: 2819 return false; 2820 } 2821 2822 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2823 } 2824 2825 bool addFieldInitializer(CXXCtorInitializer *Init) { 2826 AllToInit.push_back(Init); 2827 2828 // Check whether this initializer makes the field "used". 2829 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2830 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2831 2832 return false; 2833 } 2834}; 2835} 2836 2837/// \brief Determine whether the given indirect field declaration is somewhere 2838/// within an anonymous union. 2839static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2840 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2841 CEnd = F->chain_end(); 2842 C != CEnd; ++C) 2843 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2844 if (Record->isUnion()) 2845 return true; 2846 2847 return false; 2848} 2849 2850/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2851/// array type. 2852static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2853 if (T->isIncompleteArrayType()) 2854 return true; 2855 2856 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2857 if (!ArrayT->getSize()) 2858 return true; 2859 2860 T = ArrayT->getElementType(); 2861 } 2862 2863 return false; 2864} 2865 2866static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2867 FieldDecl *Field, 2868 IndirectFieldDecl *Indirect = 0) { 2869 2870 // Overwhelmingly common case: we have a direct initializer for this field. 2871 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2872 return Info.addFieldInitializer(Init); 2873 2874 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2875 // has a brace-or-equal-initializer, the entity is initialized as specified 2876 // in [dcl.init]. 2877 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2878 CXXCtorInitializer *Init; 2879 if (Indirect) 2880 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2881 SourceLocation(), 2882 SourceLocation(), 0, 2883 SourceLocation()); 2884 else 2885 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2886 SourceLocation(), 2887 SourceLocation(), 0, 2888 SourceLocation()); 2889 return Info.addFieldInitializer(Init); 2890 } 2891 2892 // Don't build an implicit initializer for union members if none was 2893 // explicitly specified. 2894 if (Field->getParent()->isUnion() || 2895 (Indirect && isWithinAnonymousUnion(Indirect))) 2896 return false; 2897 2898 // Don't initialize incomplete or zero-length arrays. 2899 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2900 return false; 2901 2902 // Don't try to build an implicit initializer if there were semantic 2903 // errors in any of the initializers (and therefore we might be 2904 // missing some that the user actually wrote). 2905 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2906 return false; 2907 2908 CXXCtorInitializer *Init = 0; 2909 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2910 Indirect, Init)) 2911 return true; 2912 2913 if (!Init) 2914 return false; 2915 2916 return Info.addFieldInitializer(Init); 2917} 2918 2919bool 2920Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2921 CXXCtorInitializer *Initializer) { 2922 assert(Initializer->isDelegatingInitializer()); 2923 Constructor->setNumCtorInitializers(1); 2924 CXXCtorInitializer **initializer = 2925 new (Context) CXXCtorInitializer*[1]; 2926 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2927 Constructor->setCtorInitializers(initializer); 2928 2929 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2930 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2931 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2932 } 2933 2934 DelegatingCtorDecls.push_back(Constructor); 2935 2936 return false; 2937} 2938 2939bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2940 CXXCtorInitializer **Initializers, 2941 unsigned NumInitializers, 2942 bool AnyErrors) { 2943 if (Constructor->isDependentContext()) { 2944 // Just store the initializers as written, they will be checked during 2945 // instantiation. 2946 if (NumInitializers > 0) { 2947 Constructor->setNumCtorInitializers(NumInitializers); 2948 CXXCtorInitializer **baseOrMemberInitializers = 2949 new (Context) CXXCtorInitializer*[NumInitializers]; 2950 memcpy(baseOrMemberInitializers, Initializers, 2951 NumInitializers * sizeof(CXXCtorInitializer*)); 2952 Constructor->setCtorInitializers(baseOrMemberInitializers); 2953 } 2954 2955 return false; 2956 } 2957 2958 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2959 2960 // We need to build the initializer AST according to order of construction 2961 // and not what user specified in the Initializers list. 2962 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2963 if (!ClassDecl) 2964 return true; 2965 2966 bool HadError = false; 2967 2968 for (unsigned i = 0; i < NumInitializers; i++) { 2969 CXXCtorInitializer *Member = Initializers[i]; 2970 2971 if (Member->isBaseInitializer()) 2972 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2973 else 2974 Info.AllBaseFields[Member->getAnyMember()] = Member; 2975 } 2976 2977 // Keep track of the direct virtual bases. 2978 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2979 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2980 E = ClassDecl->bases_end(); I != E; ++I) { 2981 if (I->isVirtual()) 2982 DirectVBases.insert(I); 2983 } 2984 2985 // Push virtual bases before others. 2986 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2987 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2988 2989 if (CXXCtorInitializer *Value 2990 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2991 Info.AllToInit.push_back(Value); 2992 } else if (!AnyErrors) { 2993 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2994 CXXCtorInitializer *CXXBaseInit; 2995 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2996 VBase, IsInheritedVirtualBase, 2997 CXXBaseInit)) { 2998 HadError = true; 2999 continue; 3000 } 3001 3002 Info.AllToInit.push_back(CXXBaseInit); 3003 } 3004 } 3005 3006 // Non-virtual bases. 3007 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3008 E = ClassDecl->bases_end(); Base != E; ++Base) { 3009 // Virtuals are in the virtual base list and already constructed. 3010 if (Base->isVirtual()) 3011 continue; 3012 3013 if (CXXCtorInitializer *Value 3014 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3015 Info.AllToInit.push_back(Value); 3016 } else if (!AnyErrors) { 3017 CXXCtorInitializer *CXXBaseInit; 3018 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3019 Base, /*IsInheritedVirtualBase=*/false, 3020 CXXBaseInit)) { 3021 HadError = true; 3022 continue; 3023 } 3024 3025 Info.AllToInit.push_back(CXXBaseInit); 3026 } 3027 } 3028 3029 // Fields. 3030 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3031 MemEnd = ClassDecl->decls_end(); 3032 Mem != MemEnd; ++Mem) { 3033 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3034 // C++ [class.bit]p2: 3035 // A declaration for a bit-field that omits the identifier declares an 3036 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3037 // initialized. 3038 if (F->isUnnamedBitfield()) 3039 continue; 3040 3041 // If we're not generating the implicit copy/move constructor, then we'll 3042 // handle anonymous struct/union fields based on their individual 3043 // indirect fields. 3044 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3045 continue; 3046 3047 if (CollectFieldInitializer(*this, Info, F)) 3048 HadError = true; 3049 continue; 3050 } 3051 3052 // Beyond this point, we only consider default initialization. 3053 if (Info.IIK != IIK_Default) 3054 continue; 3055 3056 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3057 if (F->getType()->isIncompleteArrayType()) { 3058 assert(ClassDecl->hasFlexibleArrayMember() && 3059 "Incomplete array type is not valid"); 3060 continue; 3061 } 3062 3063 // Initialize each field of an anonymous struct individually. 3064 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3065 HadError = true; 3066 3067 continue; 3068 } 3069 } 3070 3071 NumInitializers = Info.AllToInit.size(); 3072 if (NumInitializers > 0) { 3073 Constructor->setNumCtorInitializers(NumInitializers); 3074 CXXCtorInitializer **baseOrMemberInitializers = 3075 new (Context) CXXCtorInitializer*[NumInitializers]; 3076 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3077 NumInitializers * sizeof(CXXCtorInitializer*)); 3078 Constructor->setCtorInitializers(baseOrMemberInitializers); 3079 3080 // Constructors implicitly reference the base and member 3081 // destructors. 3082 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3083 Constructor->getParent()); 3084 } 3085 3086 return HadError; 3087} 3088 3089static void *GetKeyForTopLevelField(FieldDecl *Field) { 3090 // For anonymous unions, use the class declaration as the key. 3091 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3092 if (RT->getDecl()->isAnonymousStructOrUnion()) 3093 return static_cast<void *>(RT->getDecl()); 3094 } 3095 return static_cast<void *>(Field); 3096} 3097 3098static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3099 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3100} 3101 3102static void *GetKeyForMember(ASTContext &Context, 3103 CXXCtorInitializer *Member) { 3104 if (!Member->isAnyMemberInitializer()) 3105 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3106 3107 // For fields injected into the class via declaration of an anonymous union, 3108 // use its anonymous union class declaration as the unique key. 3109 FieldDecl *Field = Member->getAnyMember(); 3110 3111 // If the field is a member of an anonymous struct or union, our key 3112 // is the anonymous record decl that's a direct child of the class. 3113 RecordDecl *RD = Field->getParent(); 3114 if (RD->isAnonymousStructOrUnion()) { 3115 while (true) { 3116 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3117 if (Parent->isAnonymousStructOrUnion()) 3118 RD = Parent; 3119 else 3120 break; 3121 } 3122 3123 return static_cast<void *>(RD); 3124 } 3125 3126 return static_cast<void *>(Field); 3127} 3128 3129static void 3130DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3131 const CXXConstructorDecl *Constructor, 3132 CXXCtorInitializer **Inits, 3133 unsigned NumInits) { 3134 if (Constructor->getDeclContext()->isDependentContext()) 3135 return; 3136 3137 // Don't check initializers order unless the warning is enabled at the 3138 // location of at least one initializer. 3139 bool ShouldCheckOrder = false; 3140 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3141 CXXCtorInitializer *Init = Inits[InitIndex]; 3142 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3143 Init->getSourceLocation()) 3144 != DiagnosticsEngine::Ignored) { 3145 ShouldCheckOrder = true; 3146 break; 3147 } 3148 } 3149 if (!ShouldCheckOrder) 3150 return; 3151 3152 // Build the list of bases and members in the order that they'll 3153 // actually be initialized. The explicit initializers should be in 3154 // this same order but may be missing things. 3155 SmallVector<const void*, 32> IdealInitKeys; 3156 3157 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3158 3159 // 1. Virtual bases. 3160 for (CXXRecordDecl::base_class_const_iterator VBase = 3161 ClassDecl->vbases_begin(), 3162 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3163 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3164 3165 // 2. Non-virtual bases. 3166 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3167 E = ClassDecl->bases_end(); Base != E; ++Base) { 3168 if (Base->isVirtual()) 3169 continue; 3170 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3171 } 3172 3173 // 3. Direct fields. 3174 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3175 E = ClassDecl->field_end(); Field != E; ++Field) { 3176 if (Field->isUnnamedBitfield()) 3177 continue; 3178 3179 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3180 } 3181 3182 unsigned NumIdealInits = IdealInitKeys.size(); 3183 unsigned IdealIndex = 0; 3184 3185 CXXCtorInitializer *PrevInit = 0; 3186 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3187 CXXCtorInitializer *Init = Inits[InitIndex]; 3188 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3189 3190 // Scan forward to try to find this initializer in the idealized 3191 // initializers list. 3192 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3193 if (InitKey == IdealInitKeys[IdealIndex]) 3194 break; 3195 3196 // If we didn't find this initializer, it must be because we 3197 // scanned past it on a previous iteration. That can only 3198 // happen if we're out of order; emit a warning. 3199 if (IdealIndex == NumIdealInits && PrevInit) { 3200 Sema::SemaDiagnosticBuilder D = 3201 SemaRef.Diag(PrevInit->getSourceLocation(), 3202 diag::warn_initializer_out_of_order); 3203 3204 if (PrevInit->isAnyMemberInitializer()) 3205 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3206 else 3207 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3208 3209 if (Init->isAnyMemberInitializer()) 3210 D << 0 << Init->getAnyMember()->getDeclName(); 3211 else 3212 D << 1 << Init->getTypeSourceInfo()->getType(); 3213 3214 // Move back to the initializer's location in the ideal list. 3215 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3216 if (InitKey == IdealInitKeys[IdealIndex]) 3217 break; 3218 3219 assert(IdealIndex != NumIdealInits && 3220 "initializer not found in initializer list"); 3221 } 3222 3223 PrevInit = Init; 3224 } 3225} 3226 3227namespace { 3228bool CheckRedundantInit(Sema &S, 3229 CXXCtorInitializer *Init, 3230 CXXCtorInitializer *&PrevInit) { 3231 if (!PrevInit) { 3232 PrevInit = Init; 3233 return false; 3234 } 3235 3236 if (FieldDecl *Field = Init->getMember()) 3237 S.Diag(Init->getSourceLocation(), 3238 diag::err_multiple_mem_initialization) 3239 << Field->getDeclName() 3240 << Init->getSourceRange(); 3241 else { 3242 const Type *BaseClass = Init->getBaseClass(); 3243 assert(BaseClass && "neither field nor base"); 3244 S.Diag(Init->getSourceLocation(), 3245 diag::err_multiple_base_initialization) 3246 << QualType(BaseClass, 0) 3247 << Init->getSourceRange(); 3248 } 3249 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3250 << 0 << PrevInit->getSourceRange(); 3251 3252 return true; 3253} 3254 3255typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3256typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3257 3258bool CheckRedundantUnionInit(Sema &S, 3259 CXXCtorInitializer *Init, 3260 RedundantUnionMap &Unions) { 3261 FieldDecl *Field = Init->getAnyMember(); 3262 RecordDecl *Parent = Field->getParent(); 3263 NamedDecl *Child = Field; 3264 3265 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3266 if (Parent->isUnion()) { 3267 UnionEntry &En = Unions[Parent]; 3268 if (En.first && En.first != Child) { 3269 S.Diag(Init->getSourceLocation(), 3270 diag::err_multiple_mem_union_initialization) 3271 << Field->getDeclName() 3272 << Init->getSourceRange(); 3273 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3274 << 0 << En.second->getSourceRange(); 3275 return true; 3276 } 3277 if (!En.first) { 3278 En.first = Child; 3279 En.second = Init; 3280 } 3281 if (!Parent->isAnonymousStructOrUnion()) 3282 return false; 3283 } 3284 3285 Child = Parent; 3286 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3287 } 3288 3289 return false; 3290} 3291} 3292 3293/// ActOnMemInitializers - Handle the member initializers for a constructor. 3294void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3295 SourceLocation ColonLoc, 3296 CXXCtorInitializer **meminits, 3297 unsigned NumMemInits, 3298 bool AnyErrors) { 3299 if (!ConstructorDecl) 3300 return; 3301 3302 AdjustDeclIfTemplate(ConstructorDecl); 3303 3304 CXXConstructorDecl *Constructor 3305 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3306 3307 if (!Constructor) { 3308 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3309 return; 3310 } 3311 3312 CXXCtorInitializer **MemInits = 3313 reinterpret_cast<CXXCtorInitializer **>(meminits); 3314 3315 // Mapping for the duplicate initializers check. 3316 // For member initializers, this is keyed with a FieldDecl*. 3317 // For base initializers, this is keyed with a Type*. 3318 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3319 3320 // Mapping for the inconsistent anonymous-union initializers check. 3321 RedundantUnionMap MemberUnions; 3322 3323 bool HadError = false; 3324 for (unsigned i = 0; i < NumMemInits; i++) { 3325 CXXCtorInitializer *Init = MemInits[i]; 3326 3327 // Set the source order index. 3328 Init->setSourceOrder(i); 3329 3330 if (Init->isAnyMemberInitializer()) { 3331 FieldDecl *Field = Init->getAnyMember(); 3332 if (CheckRedundantInit(*this, Init, Members[Field]) || 3333 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3334 HadError = true; 3335 } else if (Init->isBaseInitializer()) { 3336 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3337 if (CheckRedundantInit(*this, Init, Members[Key])) 3338 HadError = true; 3339 } else { 3340 assert(Init->isDelegatingInitializer()); 3341 // This must be the only initializer 3342 if (i != 0 || NumMemInits > 1) { 3343 Diag(MemInits[0]->getSourceLocation(), 3344 diag::err_delegating_initializer_alone) 3345 << MemInits[0]->getSourceRange(); 3346 HadError = true; 3347 // We will treat this as being the only initializer. 3348 } 3349 SetDelegatingInitializer(Constructor, MemInits[i]); 3350 // Return immediately as the initializer is set. 3351 return; 3352 } 3353 } 3354 3355 if (HadError) 3356 return; 3357 3358 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3359 3360 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3361} 3362 3363void 3364Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3365 CXXRecordDecl *ClassDecl) { 3366 // Ignore dependent contexts. Also ignore unions, since their members never 3367 // have destructors implicitly called. 3368 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3369 return; 3370 3371 // FIXME: all the access-control diagnostics are positioned on the 3372 // field/base declaration. That's probably good; that said, the 3373 // user might reasonably want to know why the destructor is being 3374 // emitted, and we currently don't say. 3375 3376 // Non-static data members. 3377 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3378 E = ClassDecl->field_end(); I != E; ++I) { 3379 FieldDecl *Field = *I; 3380 if (Field->isInvalidDecl()) 3381 continue; 3382 3383 // Don't destroy incomplete or zero-length arrays. 3384 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3385 continue; 3386 3387 QualType FieldType = Context.getBaseElementType(Field->getType()); 3388 3389 const RecordType* RT = FieldType->getAs<RecordType>(); 3390 if (!RT) 3391 continue; 3392 3393 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3394 if (FieldClassDecl->isInvalidDecl()) 3395 continue; 3396 if (FieldClassDecl->hasIrrelevantDestructor()) 3397 continue; 3398 // The destructor for an implicit anonymous union member is never invoked. 3399 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3400 continue; 3401 3402 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3403 assert(Dtor && "No dtor found for FieldClassDecl!"); 3404 CheckDestructorAccess(Field->getLocation(), Dtor, 3405 PDiag(diag::err_access_dtor_field) 3406 << Field->getDeclName() 3407 << FieldType); 3408 3409 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3410 DiagnoseUseOfDecl(Dtor, Location); 3411 } 3412 3413 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3414 3415 // Bases. 3416 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3417 E = ClassDecl->bases_end(); Base != E; ++Base) { 3418 // Bases are always records in a well-formed non-dependent class. 3419 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3420 3421 // Remember direct virtual bases. 3422 if (Base->isVirtual()) 3423 DirectVirtualBases.insert(RT); 3424 3425 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3426 // If our base class is invalid, we probably can't get its dtor anyway. 3427 if (BaseClassDecl->isInvalidDecl()) 3428 continue; 3429 if (BaseClassDecl->hasIrrelevantDestructor()) 3430 continue; 3431 3432 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3433 assert(Dtor && "No dtor found for BaseClassDecl!"); 3434 3435 // FIXME: caret should be on the start of the class name 3436 CheckDestructorAccess(Base->getLocStart(), Dtor, 3437 PDiag(diag::err_access_dtor_base) 3438 << Base->getType() 3439 << Base->getSourceRange(), 3440 Context.getTypeDeclType(ClassDecl)); 3441 3442 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3443 DiagnoseUseOfDecl(Dtor, Location); 3444 } 3445 3446 // Virtual bases. 3447 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3448 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3449 3450 // Bases are always records in a well-formed non-dependent class. 3451 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3452 3453 // Ignore direct virtual bases. 3454 if (DirectVirtualBases.count(RT)) 3455 continue; 3456 3457 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3458 // If our base class is invalid, we probably can't get its dtor anyway. 3459 if (BaseClassDecl->isInvalidDecl()) 3460 continue; 3461 if (BaseClassDecl->hasIrrelevantDestructor()) 3462 continue; 3463 3464 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3465 assert(Dtor && "No dtor found for BaseClassDecl!"); 3466 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3467 PDiag(diag::err_access_dtor_vbase) 3468 << VBase->getType(), 3469 Context.getTypeDeclType(ClassDecl)); 3470 3471 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3472 DiagnoseUseOfDecl(Dtor, Location); 3473 } 3474} 3475 3476void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3477 if (!CDtorDecl) 3478 return; 3479 3480 if (CXXConstructorDecl *Constructor 3481 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3482 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3483} 3484 3485bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3486 unsigned DiagID, AbstractDiagSelID SelID) { 3487 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3488 unsigned DiagID; 3489 AbstractDiagSelID SelID; 3490 3491 public: 3492 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3493 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3494 3495 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3496 if (Suppressed) return; 3497 if (SelID == -1) 3498 S.Diag(Loc, DiagID) << T; 3499 else 3500 S.Diag(Loc, DiagID) << SelID << T; 3501 } 3502 } Diagnoser(DiagID, SelID); 3503 3504 return RequireNonAbstractType(Loc, T, Diagnoser); 3505} 3506 3507bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3508 TypeDiagnoser &Diagnoser) { 3509 if (!getLangOpts().CPlusPlus) 3510 return false; 3511 3512 if (const ArrayType *AT = Context.getAsArrayType(T)) 3513 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3514 3515 if (const PointerType *PT = T->getAs<PointerType>()) { 3516 // Find the innermost pointer type. 3517 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3518 PT = T; 3519 3520 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3521 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3522 } 3523 3524 const RecordType *RT = T->getAs<RecordType>(); 3525 if (!RT) 3526 return false; 3527 3528 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3529 3530 // We can't answer whether something is abstract until it has a 3531 // definition. If it's currently being defined, we'll walk back 3532 // over all the declarations when we have a full definition. 3533 const CXXRecordDecl *Def = RD->getDefinition(); 3534 if (!Def || Def->isBeingDefined()) 3535 return false; 3536 3537 if (!RD->isAbstract()) 3538 return false; 3539 3540 Diagnoser.diagnose(*this, Loc, T); 3541 DiagnoseAbstractType(RD); 3542 3543 return true; 3544} 3545 3546void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3547 // Check if we've already emitted the list of pure virtual functions 3548 // for this class. 3549 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3550 return; 3551 3552 CXXFinalOverriderMap FinalOverriders; 3553 RD->getFinalOverriders(FinalOverriders); 3554 3555 // Keep a set of seen pure methods so we won't diagnose the same method 3556 // more than once. 3557 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3558 3559 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3560 MEnd = FinalOverriders.end(); 3561 M != MEnd; 3562 ++M) { 3563 for (OverridingMethods::iterator SO = M->second.begin(), 3564 SOEnd = M->second.end(); 3565 SO != SOEnd; ++SO) { 3566 // C++ [class.abstract]p4: 3567 // A class is abstract if it contains or inherits at least one 3568 // pure virtual function for which the final overrider is pure 3569 // virtual. 3570 3571 // 3572 if (SO->second.size() != 1) 3573 continue; 3574 3575 if (!SO->second.front().Method->isPure()) 3576 continue; 3577 3578 if (!SeenPureMethods.insert(SO->second.front().Method)) 3579 continue; 3580 3581 Diag(SO->second.front().Method->getLocation(), 3582 diag::note_pure_virtual_function) 3583 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3584 } 3585 } 3586 3587 if (!PureVirtualClassDiagSet) 3588 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3589 PureVirtualClassDiagSet->insert(RD); 3590} 3591 3592namespace { 3593struct AbstractUsageInfo { 3594 Sema &S; 3595 CXXRecordDecl *Record; 3596 CanQualType AbstractType; 3597 bool Invalid; 3598 3599 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3600 : S(S), Record(Record), 3601 AbstractType(S.Context.getCanonicalType( 3602 S.Context.getTypeDeclType(Record))), 3603 Invalid(false) {} 3604 3605 void DiagnoseAbstractType() { 3606 if (Invalid) return; 3607 S.DiagnoseAbstractType(Record); 3608 Invalid = true; 3609 } 3610 3611 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3612}; 3613 3614struct CheckAbstractUsage { 3615 AbstractUsageInfo &Info; 3616 const NamedDecl *Ctx; 3617 3618 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3619 : Info(Info), Ctx(Ctx) {} 3620 3621 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3622 switch (TL.getTypeLocClass()) { 3623#define ABSTRACT_TYPELOC(CLASS, PARENT) 3624#define TYPELOC(CLASS, PARENT) \ 3625 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3626#include "clang/AST/TypeLocNodes.def" 3627 } 3628 } 3629 3630 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3631 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3632 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3633 if (!TL.getArg(I)) 3634 continue; 3635 3636 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3637 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3638 } 3639 } 3640 3641 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3642 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3643 } 3644 3645 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3646 // Visit the type parameters from a permissive context. 3647 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3648 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3649 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3650 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3651 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3652 // TODO: other template argument types? 3653 } 3654 } 3655 3656 // Visit pointee types from a permissive context. 3657#define CheckPolymorphic(Type) \ 3658 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3659 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3660 } 3661 CheckPolymorphic(PointerTypeLoc) 3662 CheckPolymorphic(ReferenceTypeLoc) 3663 CheckPolymorphic(MemberPointerTypeLoc) 3664 CheckPolymorphic(BlockPointerTypeLoc) 3665 CheckPolymorphic(AtomicTypeLoc) 3666 3667 /// Handle all the types we haven't given a more specific 3668 /// implementation for above. 3669 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3670 // Every other kind of type that we haven't called out already 3671 // that has an inner type is either (1) sugar or (2) contains that 3672 // inner type in some way as a subobject. 3673 if (TypeLoc Next = TL.getNextTypeLoc()) 3674 return Visit(Next, Sel); 3675 3676 // If there's no inner type and we're in a permissive context, 3677 // don't diagnose. 3678 if (Sel == Sema::AbstractNone) return; 3679 3680 // Check whether the type matches the abstract type. 3681 QualType T = TL.getType(); 3682 if (T->isArrayType()) { 3683 Sel = Sema::AbstractArrayType; 3684 T = Info.S.Context.getBaseElementType(T); 3685 } 3686 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3687 if (CT != Info.AbstractType) return; 3688 3689 // It matched; do some magic. 3690 if (Sel == Sema::AbstractArrayType) { 3691 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3692 << T << TL.getSourceRange(); 3693 } else { 3694 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3695 << Sel << T << TL.getSourceRange(); 3696 } 3697 Info.DiagnoseAbstractType(); 3698 } 3699}; 3700 3701void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3702 Sema::AbstractDiagSelID Sel) { 3703 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3704} 3705 3706} 3707 3708/// Check for invalid uses of an abstract type in a method declaration. 3709static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3710 CXXMethodDecl *MD) { 3711 // No need to do the check on definitions, which require that 3712 // the return/param types be complete. 3713 if (MD->doesThisDeclarationHaveABody()) 3714 return; 3715 3716 // For safety's sake, just ignore it if we don't have type source 3717 // information. This should never happen for non-implicit methods, 3718 // but... 3719 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3720 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3721} 3722 3723/// Check for invalid uses of an abstract type within a class definition. 3724static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3725 CXXRecordDecl *RD) { 3726 for (CXXRecordDecl::decl_iterator 3727 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3728 Decl *D = *I; 3729 if (D->isImplicit()) continue; 3730 3731 // Methods and method templates. 3732 if (isa<CXXMethodDecl>(D)) { 3733 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3734 } else if (isa<FunctionTemplateDecl>(D)) { 3735 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3736 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3737 3738 // Fields and static variables. 3739 } else if (isa<FieldDecl>(D)) { 3740 FieldDecl *FD = cast<FieldDecl>(D); 3741 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3742 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3743 } else if (isa<VarDecl>(D)) { 3744 VarDecl *VD = cast<VarDecl>(D); 3745 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3746 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3747 3748 // Nested classes and class templates. 3749 } else if (isa<CXXRecordDecl>(D)) { 3750 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3751 } else if (isa<ClassTemplateDecl>(D)) { 3752 CheckAbstractClassUsage(Info, 3753 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3754 } 3755 } 3756} 3757 3758/// \brief Perform semantic checks on a class definition that has been 3759/// completing, introducing implicitly-declared members, checking for 3760/// abstract types, etc. 3761void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3762 if (!Record) 3763 return; 3764 3765 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3766 AbstractUsageInfo Info(*this, Record); 3767 CheckAbstractClassUsage(Info, Record); 3768 } 3769 3770 // If this is not an aggregate type and has no user-declared constructor, 3771 // complain about any non-static data members of reference or const scalar 3772 // type, since they will never get initializers. 3773 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3774 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3775 !Record->isLambda()) { 3776 bool Complained = false; 3777 for (RecordDecl::field_iterator F = Record->field_begin(), 3778 FEnd = Record->field_end(); 3779 F != FEnd; ++F) { 3780 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3781 continue; 3782 3783 if (F->getType()->isReferenceType() || 3784 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3785 if (!Complained) { 3786 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3787 << Record->getTagKind() << Record; 3788 Complained = true; 3789 } 3790 3791 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3792 << F->getType()->isReferenceType() 3793 << F->getDeclName(); 3794 } 3795 } 3796 } 3797 3798 if (Record->isDynamicClass() && !Record->isDependentType()) 3799 DynamicClasses.push_back(Record); 3800 3801 if (Record->getIdentifier()) { 3802 // C++ [class.mem]p13: 3803 // If T is the name of a class, then each of the following shall have a 3804 // name different from T: 3805 // - every member of every anonymous union that is a member of class T. 3806 // 3807 // C++ [class.mem]p14: 3808 // In addition, if class T has a user-declared constructor (12.1), every 3809 // non-static data member of class T shall have a name different from T. 3810 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3811 R.first != R.second; ++R.first) { 3812 NamedDecl *D = *R.first; 3813 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3814 isa<IndirectFieldDecl>(D)) { 3815 Diag(D->getLocation(), diag::err_member_name_of_class) 3816 << D->getDeclName(); 3817 break; 3818 } 3819 } 3820 } 3821 3822 // Warn if the class has virtual methods but non-virtual public destructor. 3823 if (Record->isPolymorphic() && !Record->isDependentType()) { 3824 CXXDestructorDecl *dtor = Record->getDestructor(); 3825 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3826 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3827 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3828 } 3829 3830 // See if a method overloads virtual methods in a base 3831 /// class without overriding any. 3832 if (!Record->isDependentType()) { 3833 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3834 MEnd = Record->method_end(); 3835 M != MEnd; ++M) { 3836 if (!M->isStatic()) 3837 DiagnoseHiddenVirtualMethods(Record, *M); 3838 } 3839 } 3840 3841 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3842 // function that is not a constructor declares that member function to be 3843 // const. [...] The class of which that function is a member shall be 3844 // a literal type. 3845 // 3846 // If the class has virtual bases, any constexpr members will already have 3847 // been diagnosed by the checks performed on the member declaration, so 3848 // suppress this (less useful) diagnostic. 3849 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3850 !Record->isLiteral() && !Record->getNumVBases()) { 3851 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3852 MEnd = Record->method_end(); 3853 M != MEnd; ++M) { 3854 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3855 switch (Record->getTemplateSpecializationKind()) { 3856 case TSK_ImplicitInstantiation: 3857 case TSK_ExplicitInstantiationDeclaration: 3858 case TSK_ExplicitInstantiationDefinition: 3859 // If a template instantiates to a non-literal type, but its members 3860 // instantiate to constexpr functions, the template is technically 3861 // ill-formed, but we allow it for sanity. 3862 continue; 3863 3864 case TSK_Undeclared: 3865 case TSK_ExplicitSpecialization: 3866 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3867 diag::err_constexpr_method_non_literal); 3868 break; 3869 } 3870 3871 // Only produce one error per class. 3872 break; 3873 } 3874 } 3875 } 3876 3877 // Declare inherited constructors. We do this eagerly here because: 3878 // - The standard requires an eager diagnostic for conflicting inherited 3879 // constructors from different classes. 3880 // - The lazy declaration of the other implicit constructors is so as to not 3881 // waste space and performance on classes that are not meant to be 3882 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3883 // have inherited constructors. 3884 DeclareInheritedConstructors(Record); 3885} 3886 3887void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3888 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3889 ME = Record->method_end(); 3890 MI != ME; ++MI) 3891 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3892 CheckExplicitlyDefaultedSpecialMember(*MI); 3893} 3894 3895/// Is the special member function which would be selected to perform the 3896/// specified operation on the specified class type a constexpr constructor? 3897static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3898 Sema::CXXSpecialMember CSM, 3899 bool ConstArg) { 3900 Sema::SpecialMemberOverloadResult *SMOR = 3901 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3902 false, false, false, false); 3903 if (!SMOR || !SMOR->getMethod()) 3904 // A constructor we wouldn't select can't be "involved in initializing" 3905 // anything. 3906 return true; 3907 return SMOR->getMethod()->isConstexpr(); 3908} 3909 3910/// Determine whether the specified special member function would be constexpr 3911/// if it were implicitly defined. 3912static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3913 Sema::CXXSpecialMember CSM, 3914 bool ConstArg) { 3915 if (!S.getLangOpts().CPlusPlus0x) 3916 return false; 3917 3918 // C++11 [dcl.constexpr]p4: 3919 // In the definition of a constexpr constructor [...] 3920 switch (CSM) { 3921 case Sema::CXXDefaultConstructor: 3922 // Since default constructor lookup is essentially trivial (and cannot 3923 // involve, for instance, template instantiation), we compute whether a 3924 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3925 // 3926 // This is important for performance; we need to know whether the default 3927 // constructor is constexpr to determine whether the type is a literal type. 3928 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3929 3930 case Sema::CXXCopyConstructor: 3931 case Sema::CXXMoveConstructor: 3932 // For copy or move constructors, we need to perform overload resolution. 3933 break; 3934 3935 case Sema::CXXCopyAssignment: 3936 case Sema::CXXMoveAssignment: 3937 case Sema::CXXDestructor: 3938 case Sema::CXXInvalid: 3939 return false; 3940 } 3941 3942 // -- if the class is a non-empty union, or for each non-empty anonymous 3943 // union member of a non-union class, exactly one non-static data member 3944 // shall be initialized; [DR1359] 3945 // 3946 // If we squint, this is guaranteed, since exactly one non-static data member 3947 // will be initialized (if the constructor isn't deleted), we just don't know 3948 // which one. 3949 if (ClassDecl->isUnion()) 3950 return true; 3951 3952 // -- the class shall not have any virtual base classes; 3953 if (ClassDecl->getNumVBases()) 3954 return false; 3955 3956 // -- every constructor involved in initializing [...] base class 3957 // sub-objects shall be a constexpr constructor; 3958 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3959 BEnd = ClassDecl->bases_end(); 3960 B != BEnd; ++B) { 3961 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3962 if (!BaseType) continue; 3963 3964 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3965 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3966 return false; 3967 } 3968 3969 // -- every constructor involved in initializing non-static data members 3970 // [...] shall be a constexpr constructor; 3971 // -- every non-static data member and base class sub-object shall be 3972 // initialized 3973 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3974 FEnd = ClassDecl->field_end(); 3975 F != FEnd; ++F) { 3976 if (F->isInvalidDecl()) 3977 continue; 3978 if (const RecordType *RecordTy = 3979 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3980 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3981 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3982 return false; 3983 } 3984 } 3985 3986 // All OK, it's constexpr! 3987 return true; 3988} 3989 3990static Sema::ImplicitExceptionSpecification 3991computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 3992 switch (S.getSpecialMember(MD)) { 3993 case Sema::CXXDefaultConstructor: 3994 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 3995 case Sema::CXXCopyConstructor: 3996 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 3997 case Sema::CXXCopyAssignment: 3998 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 3999 case Sema::CXXMoveConstructor: 4000 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4001 case Sema::CXXMoveAssignment: 4002 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4003 case Sema::CXXDestructor: 4004 return S.ComputeDefaultedDtorExceptionSpec(MD); 4005 case Sema::CXXInvalid: 4006 break; 4007 } 4008 llvm_unreachable("only special members have implicit exception specs"); 4009} 4010 4011static void 4012updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4013 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4014 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4015 ExceptSpec.getEPI(EPI); 4016 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4017 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4018 FPT->getNumArgs(), EPI)); 4019 FD->setType(QualType(NewFPT, 0)); 4020} 4021 4022void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4023 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4024 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4025 return; 4026 4027 // Evaluate the exception specification. 4028 ImplicitExceptionSpecification ExceptSpec = 4029 computeImplicitExceptionSpec(*this, Loc, MD); 4030 4031 // Update the type of the special member to use it. 4032 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4033 4034 // A user-provided destructor can be defined outside the class. When that 4035 // happens, be sure to update the exception specification on both 4036 // declarations. 4037 const FunctionProtoType *CanonicalFPT = 4038 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4039 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4040 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4041 CanonicalFPT, ExceptSpec); 4042} 4043 4044static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4045static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4046 4047void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4048 CXXRecordDecl *RD = MD->getParent(); 4049 CXXSpecialMember CSM = getSpecialMember(MD); 4050 4051 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4052 "not an explicitly-defaulted special member"); 4053 4054 // Whether this was the first-declared instance of the constructor. 4055 // This affects whether we implicitly add an exception spec and constexpr. 4056 bool First = MD == MD->getCanonicalDecl(); 4057 4058 bool HadError = false; 4059 4060 // C++11 [dcl.fct.def.default]p1: 4061 // A function that is explicitly defaulted shall 4062 // -- be a special member function (checked elsewhere), 4063 // -- have the same type (except for ref-qualifiers, and except that a 4064 // copy operation can take a non-const reference) as an implicit 4065 // declaration, and 4066 // -- not have default arguments. 4067 unsigned ExpectedParams = 1; 4068 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4069 ExpectedParams = 0; 4070 if (MD->getNumParams() != ExpectedParams) { 4071 // This also checks for default arguments: a copy or move constructor with a 4072 // default argument is classified as a default constructor, and assignment 4073 // operations and destructors can't have default arguments. 4074 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4075 << CSM << MD->getSourceRange(); 4076 HadError = true; 4077 } 4078 4079 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4080 4081 // Compute argument constness, constexpr, and triviality. 4082 bool CanHaveConstParam = false; 4083 bool Trivial; 4084 switch (CSM) { 4085 case CXXDefaultConstructor: 4086 Trivial = RD->hasTrivialDefaultConstructor(); 4087 break; 4088 case CXXCopyConstructor: 4089 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4090 Trivial = RD->hasTrivialCopyConstructor(); 4091 break; 4092 case CXXCopyAssignment: 4093 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4094 Trivial = RD->hasTrivialCopyAssignment(); 4095 break; 4096 case CXXMoveConstructor: 4097 Trivial = RD->hasTrivialMoveConstructor(); 4098 break; 4099 case CXXMoveAssignment: 4100 Trivial = RD->hasTrivialMoveAssignment(); 4101 break; 4102 case CXXDestructor: 4103 Trivial = RD->hasTrivialDestructor(); 4104 break; 4105 case CXXInvalid: 4106 llvm_unreachable("non-special member explicitly defaulted!"); 4107 } 4108 4109 QualType ReturnType = Context.VoidTy; 4110 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4111 // Check for return type matching. 4112 ReturnType = Type->getResultType(); 4113 QualType ExpectedReturnType = 4114 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4115 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4116 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4117 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4118 HadError = true; 4119 } 4120 4121 // A defaulted special member cannot have cv-qualifiers. 4122 if (Type->getTypeQuals()) { 4123 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4124 << (CSM == CXXMoveAssignment); 4125 HadError = true; 4126 } 4127 } 4128 4129 // Check for parameter type matching. 4130 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4131 bool HasConstParam = false; 4132 if (ExpectedParams && ArgType->isReferenceType()) { 4133 // Argument must be reference to possibly-const T. 4134 QualType ReferentType = ArgType->getPointeeType(); 4135 HasConstParam = ReferentType.isConstQualified(); 4136 4137 if (ReferentType.isVolatileQualified()) { 4138 Diag(MD->getLocation(), 4139 diag::err_defaulted_special_member_volatile_param) << CSM; 4140 HadError = true; 4141 } 4142 4143 if (HasConstParam && !CanHaveConstParam) { 4144 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4145 Diag(MD->getLocation(), 4146 diag::err_defaulted_special_member_copy_const_param) 4147 << (CSM == CXXCopyAssignment); 4148 // FIXME: Explain why this special member can't be const. 4149 } else { 4150 Diag(MD->getLocation(), 4151 diag::err_defaulted_special_member_move_const_param) 4152 << (CSM == CXXMoveAssignment); 4153 } 4154 HadError = true; 4155 } 4156 4157 // If a function is explicitly defaulted on its first declaration, it shall 4158 // have the same parameter type as if it had been implicitly declared. 4159 // (Presumably this is to prevent it from being trivial?) 4160 if (!HasConstParam && CanHaveConstParam && First) 4161 Diag(MD->getLocation(), 4162 diag::err_defaulted_special_member_copy_non_const_param) 4163 << (CSM == CXXCopyAssignment); 4164 } else if (ExpectedParams) { 4165 // A copy assignment operator can take its argument by value, but a 4166 // defaulted one cannot. 4167 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4168 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4169 HadError = true; 4170 } 4171 4172 // Rebuild the type with the implicit exception specification added, if we 4173 // are going to need it. 4174 const FunctionProtoType *ImplicitType = 0; 4175 if (First || Type->hasExceptionSpec()) { 4176 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4177 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4178 ImplicitType = cast<FunctionProtoType>( 4179 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4180 } 4181 4182 // C++11 [dcl.fct.def.default]p2: 4183 // An explicitly-defaulted function may be declared constexpr only if it 4184 // would have been implicitly declared as constexpr, 4185 // Do not apply this rule to members of class templates, since core issue 1358 4186 // makes such functions always instantiate to constexpr functions. For 4187 // non-constructors, this is checked elsewhere. 4188 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4189 HasConstParam); 4190 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4191 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4192 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4193 // FIXME: Explain why the constructor can't be constexpr. 4194 HadError = true; 4195 } 4196 // and may have an explicit exception-specification only if it is compatible 4197 // with the exception-specification on the implicit declaration. 4198 if (Type->hasExceptionSpec() && 4199 CheckEquivalentExceptionSpec( 4200 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4201 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4202 HadError = true; 4203 4204 // If a function is explicitly defaulted on its first declaration, 4205 if (First) { 4206 // -- it is implicitly considered to be constexpr if the implicit 4207 // definition would be, 4208 MD->setConstexpr(Constexpr); 4209 4210 // -- it is implicitly considered to have the same exception-specification 4211 // as if it had been implicitly declared, 4212 MD->setType(QualType(ImplicitType, 0)); 4213 4214 // Such a function is also trivial if the implicitly-declared function 4215 // would have been. 4216 MD->setTrivial(Trivial); 4217 } 4218 4219 if (ShouldDeleteSpecialMember(MD, CSM)) { 4220 if (First) { 4221 MD->setDeletedAsWritten(); 4222 } else { 4223 // C++11 [dcl.fct.def.default]p4: 4224 // [For a] user-provided explicitly-defaulted function [...] if such a 4225 // function is implicitly defined as deleted, the program is ill-formed. 4226 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4227 HadError = true; 4228 } 4229 } 4230 4231 if (HadError) 4232 MD->setInvalidDecl(); 4233} 4234 4235namespace { 4236struct SpecialMemberDeletionInfo { 4237 Sema &S; 4238 CXXMethodDecl *MD; 4239 Sema::CXXSpecialMember CSM; 4240 bool Diagnose; 4241 4242 // Properties of the special member, computed for convenience. 4243 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4244 SourceLocation Loc; 4245 4246 bool AllFieldsAreConst; 4247 4248 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4249 Sema::CXXSpecialMember CSM, bool Diagnose) 4250 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4251 IsConstructor(false), IsAssignment(false), IsMove(false), 4252 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4253 AllFieldsAreConst(true) { 4254 switch (CSM) { 4255 case Sema::CXXDefaultConstructor: 4256 case Sema::CXXCopyConstructor: 4257 IsConstructor = true; 4258 break; 4259 case Sema::CXXMoveConstructor: 4260 IsConstructor = true; 4261 IsMove = true; 4262 break; 4263 case Sema::CXXCopyAssignment: 4264 IsAssignment = true; 4265 break; 4266 case Sema::CXXMoveAssignment: 4267 IsAssignment = true; 4268 IsMove = true; 4269 break; 4270 case Sema::CXXDestructor: 4271 break; 4272 case Sema::CXXInvalid: 4273 llvm_unreachable("invalid special member kind"); 4274 } 4275 4276 if (MD->getNumParams()) { 4277 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4278 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4279 } 4280 } 4281 4282 bool inUnion() const { return MD->getParent()->isUnion(); } 4283 4284 /// Look up the corresponding special member in the given class. 4285 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4286 unsigned Quals) { 4287 unsigned TQ = MD->getTypeQualifiers(); 4288 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4289 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4290 Quals = 0; 4291 return S.LookupSpecialMember(Class, CSM, 4292 ConstArg || (Quals & Qualifiers::Const), 4293 VolatileArg || (Quals & Qualifiers::Volatile), 4294 MD->getRefQualifier() == RQ_RValue, 4295 TQ & Qualifiers::Const, 4296 TQ & Qualifiers::Volatile); 4297 } 4298 4299 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4300 4301 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4302 bool shouldDeleteForField(FieldDecl *FD); 4303 bool shouldDeleteForAllConstMembers(); 4304 4305 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4306 unsigned Quals); 4307 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4308 Sema::SpecialMemberOverloadResult *SMOR, 4309 bool IsDtorCallInCtor); 4310 4311 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4312}; 4313} 4314 4315/// Is the given special member inaccessible when used on the given 4316/// sub-object. 4317bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4318 CXXMethodDecl *target) { 4319 /// If we're operating on a base class, the object type is the 4320 /// type of this special member. 4321 QualType objectTy; 4322 AccessSpecifier access = target->getAccess();; 4323 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4324 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4325 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4326 4327 // If we're operating on a field, the object type is the type of the field. 4328 } else { 4329 objectTy = S.Context.getTypeDeclType(target->getParent()); 4330 } 4331 4332 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4333} 4334 4335/// Check whether we should delete a special member due to the implicit 4336/// definition containing a call to a special member of a subobject. 4337bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4338 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4339 bool IsDtorCallInCtor) { 4340 CXXMethodDecl *Decl = SMOR->getMethod(); 4341 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4342 4343 int DiagKind = -1; 4344 4345 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4346 DiagKind = !Decl ? 0 : 1; 4347 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4348 DiagKind = 2; 4349 else if (!isAccessible(Subobj, Decl)) 4350 DiagKind = 3; 4351 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4352 !Decl->isTrivial()) { 4353 // A member of a union must have a trivial corresponding special member. 4354 // As a weird special case, a destructor call from a union's constructor 4355 // must be accessible and non-deleted, but need not be trivial. Such a 4356 // destructor is never actually called, but is semantically checked as 4357 // if it were. 4358 DiagKind = 4; 4359 } 4360 4361 if (DiagKind == -1) 4362 return false; 4363 4364 if (Diagnose) { 4365 if (Field) { 4366 S.Diag(Field->getLocation(), 4367 diag::note_deleted_special_member_class_subobject) 4368 << CSM << MD->getParent() << /*IsField*/true 4369 << Field << DiagKind << IsDtorCallInCtor; 4370 } else { 4371 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4372 S.Diag(Base->getLocStart(), 4373 diag::note_deleted_special_member_class_subobject) 4374 << CSM << MD->getParent() << /*IsField*/false 4375 << Base->getType() << DiagKind << IsDtorCallInCtor; 4376 } 4377 4378 if (DiagKind == 1) 4379 S.NoteDeletedFunction(Decl); 4380 // FIXME: Explain inaccessibility if DiagKind == 3. 4381 } 4382 4383 return true; 4384} 4385 4386/// Check whether we should delete a special member function due to having a 4387/// direct or virtual base class or non-static data member of class type M. 4388bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4389 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4390 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4391 4392 // C++11 [class.ctor]p5: 4393 // -- any direct or virtual base class, or non-static data member with no 4394 // brace-or-equal-initializer, has class type M (or array thereof) and 4395 // either M has no default constructor or overload resolution as applied 4396 // to M's default constructor results in an ambiguity or in a function 4397 // that is deleted or inaccessible 4398 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4399 // -- a direct or virtual base class B that cannot be copied/moved because 4400 // overload resolution, as applied to B's corresponding special member, 4401 // results in an ambiguity or a function that is deleted or inaccessible 4402 // from the defaulted special member 4403 // C++11 [class.dtor]p5: 4404 // -- any direct or virtual base class [...] has a type with a destructor 4405 // that is deleted or inaccessible 4406 if (!(CSM == Sema::CXXDefaultConstructor && 4407 Field && Field->hasInClassInitializer()) && 4408 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4409 return true; 4410 4411 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4412 // -- any direct or virtual base class or non-static data member has a 4413 // type with a destructor that is deleted or inaccessible 4414 if (IsConstructor) { 4415 Sema::SpecialMemberOverloadResult *SMOR = 4416 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4417 false, false, false, false, false); 4418 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4419 return true; 4420 } 4421 4422 return false; 4423} 4424 4425/// Check whether we should delete a special member function due to the class 4426/// having a particular direct or virtual base class. 4427bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4428 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4429 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4430} 4431 4432/// Check whether we should delete a special member function due to the class 4433/// having a particular non-static data member. 4434bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4435 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4436 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4437 4438 if (CSM == Sema::CXXDefaultConstructor) { 4439 // For a default constructor, all references must be initialized in-class 4440 // and, if a union, it must have a non-const member. 4441 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4442 if (Diagnose) 4443 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4444 << MD->getParent() << FD << FieldType << /*Reference*/0; 4445 return true; 4446 } 4447 // C++11 [class.ctor]p5: any non-variant non-static data member of 4448 // const-qualified type (or array thereof) with no 4449 // brace-or-equal-initializer does not have a user-provided default 4450 // constructor. 4451 if (!inUnion() && FieldType.isConstQualified() && 4452 !FD->hasInClassInitializer() && 4453 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4454 if (Diagnose) 4455 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4456 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4457 return true; 4458 } 4459 4460 if (inUnion() && !FieldType.isConstQualified()) 4461 AllFieldsAreConst = false; 4462 } else if (CSM == Sema::CXXCopyConstructor) { 4463 // For a copy constructor, data members must not be of rvalue reference 4464 // type. 4465 if (FieldType->isRValueReferenceType()) { 4466 if (Diagnose) 4467 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4468 << MD->getParent() << FD << FieldType; 4469 return true; 4470 } 4471 } else if (IsAssignment) { 4472 // For an assignment operator, data members must not be of reference type. 4473 if (FieldType->isReferenceType()) { 4474 if (Diagnose) 4475 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4476 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4477 return true; 4478 } 4479 if (!FieldRecord && FieldType.isConstQualified()) { 4480 // C++11 [class.copy]p23: 4481 // -- a non-static data member of const non-class type (or array thereof) 4482 if (Diagnose) 4483 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4484 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4485 return true; 4486 } 4487 } 4488 4489 if (FieldRecord) { 4490 // Some additional restrictions exist on the variant members. 4491 if (!inUnion() && FieldRecord->isUnion() && 4492 FieldRecord->isAnonymousStructOrUnion()) { 4493 bool AllVariantFieldsAreConst = true; 4494 4495 // FIXME: Handle anonymous unions declared within anonymous unions. 4496 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4497 UE = FieldRecord->field_end(); 4498 UI != UE; ++UI) { 4499 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4500 4501 if (!UnionFieldType.isConstQualified()) 4502 AllVariantFieldsAreConst = false; 4503 4504 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4505 if (UnionFieldRecord && 4506 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4507 UnionFieldType.getCVRQualifiers())) 4508 return true; 4509 } 4510 4511 // At least one member in each anonymous union must be non-const 4512 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4513 FieldRecord->field_begin() != FieldRecord->field_end()) { 4514 if (Diagnose) 4515 S.Diag(FieldRecord->getLocation(), 4516 diag::note_deleted_default_ctor_all_const) 4517 << MD->getParent() << /*anonymous union*/1; 4518 return true; 4519 } 4520 4521 // Don't check the implicit member of the anonymous union type. 4522 // This is technically non-conformant, but sanity demands it. 4523 return false; 4524 } 4525 4526 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4527 FieldType.getCVRQualifiers())) 4528 return true; 4529 } 4530 4531 return false; 4532} 4533 4534/// C++11 [class.ctor] p5: 4535/// A defaulted default constructor for a class X is defined as deleted if 4536/// X is a union and all of its variant members are of const-qualified type. 4537bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4538 // This is a silly definition, because it gives an empty union a deleted 4539 // default constructor. Don't do that. 4540 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4541 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4542 if (Diagnose) 4543 S.Diag(MD->getParent()->getLocation(), 4544 diag::note_deleted_default_ctor_all_const) 4545 << MD->getParent() << /*not anonymous union*/0; 4546 return true; 4547 } 4548 return false; 4549} 4550 4551/// Determine whether a defaulted special member function should be defined as 4552/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4553/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4554bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4555 bool Diagnose) { 4556 if (MD->isInvalidDecl()) 4557 return false; 4558 CXXRecordDecl *RD = MD->getParent(); 4559 assert(!RD->isDependentType() && "do deletion after instantiation"); 4560 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4561 return false; 4562 4563 // C++11 [expr.lambda.prim]p19: 4564 // The closure type associated with a lambda-expression has a 4565 // deleted (8.4.3) default constructor and a deleted copy 4566 // assignment operator. 4567 if (RD->isLambda() && 4568 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4569 if (Diagnose) 4570 Diag(RD->getLocation(), diag::note_lambda_decl); 4571 return true; 4572 } 4573 4574 // For an anonymous struct or union, the copy and assignment special members 4575 // will never be used, so skip the check. For an anonymous union declared at 4576 // namespace scope, the constructor and destructor are used. 4577 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4578 RD->isAnonymousStructOrUnion()) 4579 return false; 4580 4581 // C++11 [class.copy]p7, p18: 4582 // If the class definition declares a move constructor or move assignment 4583 // operator, an implicitly declared copy constructor or copy assignment 4584 // operator is defined as deleted. 4585 if (MD->isImplicit() && 4586 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4587 CXXMethodDecl *UserDeclaredMove = 0; 4588 4589 // In Microsoft mode, a user-declared move only causes the deletion of the 4590 // corresponding copy operation, not both copy operations. 4591 if (RD->hasUserDeclaredMoveConstructor() && 4592 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4593 if (!Diagnose) return true; 4594 UserDeclaredMove = RD->getMoveConstructor(); 4595 assert(UserDeclaredMove); 4596 } else if (RD->hasUserDeclaredMoveAssignment() && 4597 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4598 if (!Diagnose) return true; 4599 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4600 assert(UserDeclaredMove); 4601 } 4602 4603 if (UserDeclaredMove) { 4604 Diag(UserDeclaredMove->getLocation(), 4605 diag::note_deleted_copy_user_declared_move) 4606 << (CSM == CXXCopyAssignment) << RD 4607 << UserDeclaredMove->isMoveAssignmentOperator(); 4608 return true; 4609 } 4610 } 4611 4612 // Do access control from the special member function 4613 ContextRAII MethodContext(*this, MD); 4614 4615 // C++11 [class.dtor]p5: 4616 // -- for a virtual destructor, lookup of the non-array deallocation function 4617 // results in an ambiguity or in a function that is deleted or inaccessible 4618 if (CSM == CXXDestructor && MD->isVirtual()) { 4619 FunctionDecl *OperatorDelete = 0; 4620 DeclarationName Name = 4621 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4622 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4623 OperatorDelete, false)) { 4624 if (Diagnose) 4625 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4626 return true; 4627 } 4628 } 4629 4630 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4631 4632 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4633 BE = RD->bases_end(); BI != BE; ++BI) 4634 if (!BI->isVirtual() && 4635 SMI.shouldDeleteForBase(BI)) 4636 return true; 4637 4638 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4639 BE = RD->vbases_end(); BI != BE; ++BI) 4640 if (SMI.shouldDeleteForBase(BI)) 4641 return true; 4642 4643 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4644 FE = RD->field_end(); FI != FE; ++FI) 4645 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4646 SMI.shouldDeleteForField(*FI)) 4647 return true; 4648 4649 if (SMI.shouldDeleteForAllConstMembers()) 4650 return true; 4651 4652 return false; 4653} 4654 4655/// \brief Data used with FindHiddenVirtualMethod 4656namespace { 4657 struct FindHiddenVirtualMethodData { 4658 Sema *S; 4659 CXXMethodDecl *Method; 4660 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4661 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4662 }; 4663} 4664 4665/// \brief Member lookup function that determines whether a given C++ 4666/// method overloads virtual methods in a base class without overriding any, 4667/// to be used with CXXRecordDecl::lookupInBases(). 4668static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4669 CXXBasePath &Path, 4670 void *UserData) { 4671 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4672 4673 FindHiddenVirtualMethodData &Data 4674 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4675 4676 DeclarationName Name = Data.Method->getDeclName(); 4677 assert(Name.getNameKind() == DeclarationName::Identifier); 4678 4679 bool foundSameNameMethod = false; 4680 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4681 for (Path.Decls = BaseRecord->lookup(Name); 4682 Path.Decls.first != Path.Decls.second; 4683 ++Path.Decls.first) { 4684 NamedDecl *D = *Path.Decls.first; 4685 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4686 MD = MD->getCanonicalDecl(); 4687 foundSameNameMethod = true; 4688 // Interested only in hidden virtual methods. 4689 if (!MD->isVirtual()) 4690 continue; 4691 // If the method we are checking overrides a method from its base 4692 // don't warn about the other overloaded methods. 4693 if (!Data.S->IsOverload(Data.Method, MD, false)) 4694 return true; 4695 // Collect the overload only if its hidden. 4696 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4697 overloadedMethods.push_back(MD); 4698 } 4699 } 4700 4701 if (foundSameNameMethod) 4702 Data.OverloadedMethods.append(overloadedMethods.begin(), 4703 overloadedMethods.end()); 4704 return foundSameNameMethod; 4705} 4706 4707/// \brief See if a method overloads virtual methods in a base class without 4708/// overriding any. 4709void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4710 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4711 MD->getLocation()) == DiagnosticsEngine::Ignored) 4712 return; 4713 if (!MD->getDeclName().isIdentifier()) 4714 return; 4715 4716 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4717 /*bool RecordPaths=*/false, 4718 /*bool DetectVirtual=*/false); 4719 FindHiddenVirtualMethodData Data; 4720 Data.Method = MD; 4721 Data.S = this; 4722 4723 // Keep the base methods that were overriden or introduced in the subclass 4724 // by 'using' in a set. A base method not in this set is hidden. 4725 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4726 res.first != res.second; ++res.first) { 4727 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4728 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4729 E = MD->end_overridden_methods(); 4730 I != E; ++I) 4731 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4732 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4733 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4734 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4735 } 4736 4737 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4738 !Data.OverloadedMethods.empty()) { 4739 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4740 << MD << (Data.OverloadedMethods.size() > 1); 4741 4742 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4743 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4744 Diag(overloadedMD->getLocation(), 4745 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4746 } 4747 } 4748} 4749 4750void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4751 Decl *TagDecl, 4752 SourceLocation LBrac, 4753 SourceLocation RBrac, 4754 AttributeList *AttrList) { 4755 if (!TagDecl) 4756 return; 4757 4758 AdjustDeclIfTemplate(TagDecl); 4759 4760 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4761 if (l->getKind() != AttributeList::AT_Visibility) 4762 continue; 4763 l->setInvalid(); 4764 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4765 l->getName(); 4766 } 4767 4768 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4769 // strict aliasing violation! 4770 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4771 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4772 4773 CheckCompletedCXXClass( 4774 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4775} 4776 4777/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4778/// special functions, such as the default constructor, copy 4779/// constructor, or destructor, to the given C++ class (C++ 4780/// [special]p1). This routine can only be executed just before the 4781/// definition of the class is complete. 4782void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4783 if (!ClassDecl->hasUserDeclaredConstructor()) 4784 ++ASTContext::NumImplicitDefaultConstructors; 4785 4786 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4787 ++ASTContext::NumImplicitCopyConstructors; 4788 4789 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4790 ++ASTContext::NumImplicitMoveConstructors; 4791 4792 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4793 ++ASTContext::NumImplicitCopyAssignmentOperators; 4794 4795 // If we have a dynamic class, then the copy assignment operator may be 4796 // virtual, so we have to declare it immediately. This ensures that, e.g., 4797 // it shows up in the right place in the vtable and that we diagnose 4798 // problems with the implicit exception specification. 4799 if (ClassDecl->isDynamicClass()) 4800 DeclareImplicitCopyAssignment(ClassDecl); 4801 } 4802 4803 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4804 ++ASTContext::NumImplicitMoveAssignmentOperators; 4805 4806 // Likewise for the move assignment operator. 4807 if (ClassDecl->isDynamicClass()) 4808 DeclareImplicitMoveAssignment(ClassDecl); 4809 } 4810 4811 if (!ClassDecl->hasUserDeclaredDestructor()) { 4812 ++ASTContext::NumImplicitDestructors; 4813 4814 // If we have a dynamic class, then the destructor may be virtual, so we 4815 // have to declare the destructor immediately. This ensures that, e.g., it 4816 // shows up in the right place in the vtable and that we diagnose problems 4817 // with the implicit exception specification. 4818 if (ClassDecl->isDynamicClass()) 4819 DeclareImplicitDestructor(ClassDecl); 4820 } 4821} 4822 4823void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4824 if (!D) 4825 return; 4826 4827 int NumParamList = D->getNumTemplateParameterLists(); 4828 for (int i = 0; i < NumParamList; i++) { 4829 TemplateParameterList* Params = D->getTemplateParameterList(i); 4830 for (TemplateParameterList::iterator Param = Params->begin(), 4831 ParamEnd = Params->end(); 4832 Param != ParamEnd; ++Param) { 4833 NamedDecl *Named = cast<NamedDecl>(*Param); 4834 if (Named->getDeclName()) { 4835 S->AddDecl(Named); 4836 IdResolver.AddDecl(Named); 4837 } 4838 } 4839 } 4840} 4841 4842void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4843 if (!D) 4844 return; 4845 4846 TemplateParameterList *Params = 0; 4847 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4848 Params = Template->getTemplateParameters(); 4849 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4850 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4851 Params = PartialSpec->getTemplateParameters(); 4852 else 4853 return; 4854 4855 for (TemplateParameterList::iterator Param = Params->begin(), 4856 ParamEnd = Params->end(); 4857 Param != ParamEnd; ++Param) { 4858 NamedDecl *Named = cast<NamedDecl>(*Param); 4859 if (Named->getDeclName()) { 4860 S->AddDecl(Named); 4861 IdResolver.AddDecl(Named); 4862 } 4863 } 4864} 4865 4866void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4867 if (!RecordD) return; 4868 AdjustDeclIfTemplate(RecordD); 4869 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4870 PushDeclContext(S, Record); 4871} 4872 4873void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4874 if (!RecordD) return; 4875 PopDeclContext(); 4876} 4877 4878/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4879/// parsing a top-level (non-nested) C++ class, and we are now 4880/// parsing those parts of the given Method declaration that could 4881/// not be parsed earlier (C++ [class.mem]p2), such as default 4882/// arguments. This action should enter the scope of the given 4883/// Method declaration as if we had just parsed the qualified method 4884/// name. However, it should not bring the parameters into scope; 4885/// that will be performed by ActOnDelayedCXXMethodParameter. 4886void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4887} 4888 4889/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4890/// C++ method declaration. We're (re-)introducing the given 4891/// function parameter into scope for use in parsing later parts of 4892/// the method declaration. For example, we could see an 4893/// ActOnParamDefaultArgument event for this parameter. 4894void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4895 if (!ParamD) 4896 return; 4897 4898 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4899 4900 // If this parameter has an unparsed default argument, clear it out 4901 // to make way for the parsed default argument. 4902 if (Param->hasUnparsedDefaultArg()) 4903 Param->setDefaultArg(0); 4904 4905 S->AddDecl(Param); 4906 if (Param->getDeclName()) 4907 IdResolver.AddDecl(Param); 4908} 4909 4910/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4911/// processing the delayed method declaration for Method. The method 4912/// declaration is now considered finished. There may be a separate 4913/// ActOnStartOfFunctionDef action later (not necessarily 4914/// immediately!) for this method, if it was also defined inside the 4915/// class body. 4916void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4917 if (!MethodD) 4918 return; 4919 4920 AdjustDeclIfTemplate(MethodD); 4921 4922 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4923 4924 // Now that we have our default arguments, check the constructor 4925 // again. It could produce additional diagnostics or affect whether 4926 // the class has implicitly-declared destructors, among other 4927 // things. 4928 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4929 CheckConstructor(Constructor); 4930 4931 // Check the default arguments, which we may have added. 4932 if (!Method->isInvalidDecl()) 4933 CheckCXXDefaultArguments(Method); 4934} 4935 4936/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4937/// the well-formedness of the constructor declarator @p D with type @p 4938/// R. If there are any errors in the declarator, this routine will 4939/// emit diagnostics and set the invalid bit to true. In any case, the type 4940/// will be updated to reflect a well-formed type for the constructor and 4941/// returned. 4942QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4943 StorageClass &SC) { 4944 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4945 4946 // C++ [class.ctor]p3: 4947 // A constructor shall not be virtual (10.3) or static (9.4). A 4948 // constructor can be invoked for a const, volatile or const 4949 // volatile object. A constructor shall not be declared const, 4950 // volatile, or const volatile (9.3.2). 4951 if (isVirtual) { 4952 if (!D.isInvalidType()) 4953 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4954 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4955 << SourceRange(D.getIdentifierLoc()); 4956 D.setInvalidType(); 4957 } 4958 if (SC == SC_Static) { 4959 if (!D.isInvalidType()) 4960 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4961 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4962 << SourceRange(D.getIdentifierLoc()); 4963 D.setInvalidType(); 4964 SC = SC_None; 4965 } 4966 4967 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4968 if (FTI.TypeQuals != 0) { 4969 if (FTI.TypeQuals & Qualifiers::Const) 4970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4971 << "const" << SourceRange(D.getIdentifierLoc()); 4972 if (FTI.TypeQuals & Qualifiers::Volatile) 4973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4974 << "volatile" << SourceRange(D.getIdentifierLoc()); 4975 if (FTI.TypeQuals & Qualifiers::Restrict) 4976 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4977 << "restrict" << SourceRange(D.getIdentifierLoc()); 4978 D.setInvalidType(); 4979 } 4980 4981 // C++0x [class.ctor]p4: 4982 // A constructor shall not be declared with a ref-qualifier. 4983 if (FTI.hasRefQualifier()) { 4984 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4985 << FTI.RefQualifierIsLValueRef 4986 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4987 D.setInvalidType(); 4988 } 4989 4990 // Rebuild the function type "R" without any type qualifiers (in 4991 // case any of the errors above fired) and with "void" as the 4992 // return type, since constructors don't have return types. 4993 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4994 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4995 return R; 4996 4997 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4998 EPI.TypeQuals = 0; 4999 EPI.RefQualifier = RQ_None; 5000 5001 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5002 Proto->getNumArgs(), EPI); 5003} 5004 5005/// CheckConstructor - Checks a fully-formed constructor for 5006/// well-formedness, issuing any diagnostics required. Returns true if 5007/// the constructor declarator is invalid. 5008void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5009 CXXRecordDecl *ClassDecl 5010 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5011 if (!ClassDecl) 5012 return Constructor->setInvalidDecl(); 5013 5014 // C++ [class.copy]p3: 5015 // A declaration of a constructor for a class X is ill-formed if 5016 // its first parameter is of type (optionally cv-qualified) X and 5017 // either there are no other parameters or else all other 5018 // parameters have default arguments. 5019 if (!Constructor->isInvalidDecl() && 5020 ((Constructor->getNumParams() == 1) || 5021 (Constructor->getNumParams() > 1 && 5022 Constructor->getParamDecl(1)->hasDefaultArg())) && 5023 Constructor->getTemplateSpecializationKind() 5024 != TSK_ImplicitInstantiation) { 5025 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5026 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5027 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5028 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5029 const char *ConstRef 5030 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5031 : " const &"; 5032 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5033 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5034 5035 // FIXME: Rather that making the constructor invalid, we should endeavor 5036 // to fix the type. 5037 Constructor->setInvalidDecl(); 5038 } 5039 } 5040} 5041 5042/// CheckDestructor - Checks a fully-formed destructor definition for 5043/// well-formedness, issuing any diagnostics required. Returns true 5044/// on error. 5045bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5046 CXXRecordDecl *RD = Destructor->getParent(); 5047 5048 if (Destructor->isVirtual()) { 5049 SourceLocation Loc; 5050 5051 if (!Destructor->isImplicit()) 5052 Loc = Destructor->getLocation(); 5053 else 5054 Loc = RD->getLocation(); 5055 5056 // If we have a virtual destructor, look up the deallocation function 5057 FunctionDecl *OperatorDelete = 0; 5058 DeclarationName Name = 5059 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5060 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5061 return true; 5062 5063 MarkFunctionReferenced(Loc, OperatorDelete); 5064 5065 Destructor->setOperatorDelete(OperatorDelete); 5066 } 5067 5068 return false; 5069} 5070 5071static inline bool 5072FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5073 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5074 FTI.ArgInfo[0].Param && 5075 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5076} 5077 5078/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5079/// the well-formednes of the destructor declarator @p D with type @p 5080/// R. If there are any errors in the declarator, this routine will 5081/// emit diagnostics and set the declarator to invalid. Even if this happens, 5082/// will be updated to reflect a well-formed type for the destructor and 5083/// returned. 5084QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5085 StorageClass& SC) { 5086 // C++ [class.dtor]p1: 5087 // [...] A typedef-name that names a class is a class-name 5088 // (7.1.3); however, a typedef-name that names a class shall not 5089 // be used as the identifier in the declarator for a destructor 5090 // declaration. 5091 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5092 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5093 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5094 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5095 else if (const TemplateSpecializationType *TST = 5096 DeclaratorType->getAs<TemplateSpecializationType>()) 5097 if (TST->isTypeAlias()) 5098 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5099 << DeclaratorType << 1; 5100 5101 // C++ [class.dtor]p2: 5102 // A destructor is used to destroy objects of its class type. A 5103 // destructor takes no parameters, and no return type can be 5104 // specified for it (not even void). The address of a destructor 5105 // shall not be taken. A destructor shall not be static. A 5106 // destructor can be invoked for a const, volatile or const 5107 // volatile object. A destructor shall not be declared const, 5108 // volatile or const volatile (9.3.2). 5109 if (SC == SC_Static) { 5110 if (!D.isInvalidType()) 5111 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5112 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5113 << SourceRange(D.getIdentifierLoc()) 5114 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5115 5116 SC = SC_None; 5117 } 5118 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5119 // Destructors don't have return types, but the parser will 5120 // happily parse something like: 5121 // 5122 // class X { 5123 // float ~X(); 5124 // }; 5125 // 5126 // The return type will be eliminated later. 5127 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5128 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5129 << SourceRange(D.getIdentifierLoc()); 5130 } 5131 5132 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5133 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5134 if (FTI.TypeQuals & Qualifiers::Const) 5135 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5136 << "const" << SourceRange(D.getIdentifierLoc()); 5137 if (FTI.TypeQuals & Qualifiers::Volatile) 5138 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5139 << "volatile" << SourceRange(D.getIdentifierLoc()); 5140 if (FTI.TypeQuals & Qualifiers::Restrict) 5141 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5142 << "restrict" << SourceRange(D.getIdentifierLoc()); 5143 D.setInvalidType(); 5144 } 5145 5146 // C++0x [class.dtor]p2: 5147 // A destructor shall not be declared with a ref-qualifier. 5148 if (FTI.hasRefQualifier()) { 5149 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5150 << FTI.RefQualifierIsLValueRef 5151 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5152 D.setInvalidType(); 5153 } 5154 5155 // Make sure we don't have any parameters. 5156 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5157 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5158 5159 // Delete the parameters. 5160 FTI.freeArgs(); 5161 D.setInvalidType(); 5162 } 5163 5164 // Make sure the destructor isn't variadic. 5165 if (FTI.isVariadic) { 5166 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5167 D.setInvalidType(); 5168 } 5169 5170 // Rebuild the function type "R" without any type qualifiers or 5171 // parameters (in case any of the errors above fired) and with 5172 // "void" as the return type, since destructors don't have return 5173 // types. 5174 if (!D.isInvalidType()) 5175 return R; 5176 5177 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5178 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5179 EPI.Variadic = false; 5180 EPI.TypeQuals = 0; 5181 EPI.RefQualifier = RQ_None; 5182 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5183} 5184 5185/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5186/// well-formednes of the conversion function declarator @p D with 5187/// type @p R. If there are any errors in the declarator, this routine 5188/// will emit diagnostics and return true. Otherwise, it will return 5189/// false. Either way, the type @p R will be updated to reflect a 5190/// well-formed type for the conversion operator. 5191void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5192 StorageClass& SC) { 5193 // C++ [class.conv.fct]p1: 5194 // Neither parameter types nor return type can be specified. The 5195 // type of a conversion function (8.3.5) is "function taking no 5196 // parameter returning conversion-type-id." 5197 if (SC == SC_Static) { 5198 if (!D.isInvalidType()) 5199 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5200 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5201 << SourceRange(D.getIdentifierLoc()); 5202 D.setInvalidType(); 5203 SC = SC_None; 5204 } 5205 5206 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5207 5208 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5209 // Conversion functions don't have return types, but the parser will 5210 // happily parse something like: 5211 // 5212 // class X { 5213 // float operator bool(); 5214 // }; 5215 // 5216 // The return type will be changed later anyway. 5217 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5218 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5219 << SourceRange(D.getIdentifierLoc()); 5220 D.setInvalidType(); 5221 } 5222 5223 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5224 5225 // Make sure we don't have any parameters. 5226 if (Proto->getNumArgs() > 0) { 5227 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5228 5229 // Delete the parameters. 5230 D.getFunctionTypeInfo().freeArgs(); 5231 D.setInvalidType(); 5232 } else if (Proto->isVariadic()) { 5233 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5234 D.setInvalidType(); 5235 } 5236 5237 // Diagnose "&operator bool()" and other such nonsense. This 5238 // is actually a gcc extension which we don't support. 5239 if (Proto->getResultType() != ConvType) { 5240 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5241 << Proto->getResultType(); 5242 D.setInvalidType(); 5243 ConvType = Proto->getResultType(); 5244 } 5245 5246 // C++ [class.conv.fct]p4: 5247 // The conversion-type-id shall not represent a function type nor 5248 // an array type. 5249 if (ConvType->isArrayType()) { 5250 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5251 ConvType = Context.getPointerType(ConvType); 5252 D.setInvalidType(); 5253 } else if (ConvType->isFunctionType()) { 5254 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5255 ConvType = Context.getPointerType(ConvType); 5256 D.setInvalidType(); 5257 } 5258 5259 // Rebuild the function type "R" without any parameters (in case any 5260 // of the errors above fired) and with the conversion type as the 5261 // return type. 5262 if (D.isInvalidType()) 5263 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5264 5265 // C++0x explicit conversion operators. 5266 if (D.getDeclSpec().isExplicitSpecified()) 5267 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5268 getLangOpts().CPlusPlus0x ? 5269 diag::warn_cxx98_compat_explicit_conversion_functions : 5270 diag::ext_explicit_conversion_functions) 5271 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5272} 5273 5274/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5275/// the declaration of the given C++ conversion function. This routine 5276/// is responsible for recording the conversion function in the C++ 5277/// class, if possible. 5278Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5279 assert(Conversion && "Expected to receive a conversion function declaration"); 5280 5281 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5282 5283 // Make sure we aren't redeclaring the conversion function. 5284 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5285 5286 // C++ [class.conv.fct]p1: 5287 // [...] A conversion function is never used to convert a 5288 // (possibly cv-qualified) object to the (possibly cv-qualified) 5289 // same object type (or a reference to it), to a (possibly 5290 // cv-qualified) base class of that type (or a reference to it), 5291 // or to (possibly cv-qualified) void. 5292 // FIXME: Suppress this warning if the conversion function ends up being a 5293 // virtual function that overrides a virtual function in a base class. 5294 QualType ClassType 5295 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5296 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5297 ConvType = ConvTypeRef->getPointeeType(); 5298 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5299 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5300 /* Suppress diagnostics for instantiations. */; 5301 else if (ConvType->isRecordType()) { 5302 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5303 if (ConvType == ClassType) 5304 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5305 << ClassType; 5306 else if (IsDerivedFrom(ClassType, ConvType)) 5307 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5308 << ClassType << ConvType; 5309 } else if (ConvType->isVoidType()) { 5310 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5311 << ClassType << ConvType; 5312 } 5313 5314 if (FunctionTemplateDecl *ConversionTemplate 5315 = Conversion->getDescribedFunctionTemplate()) 5316 return ConversionTemplate; 5317 5318 return Conversion; 5319} 5320 5321//===----------------------------------------------------------------------===// 5322// Namespace Handling 5323//===----------------------------------------------------------------------===// 5324 5325 5326 5327/// ActOnStartNamespaceDef - This is called at the start of a namespace 5328/// definition. 5329Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5330 SourceLocation InlineLoc, 5331 SourceLocation NamespaceLoc, 5332 SourceLocation IdentLoc, 5333 IdentifierInfo *II, 5334 SourceLocation LBrace, 5335 AttributeList *AttrList) { 5336 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5337 // For anonymous namespace, take the location of the left brace. 5338 SourceLocation Loc = II ? IdentLoc : LBrace; 5339 bool IsInline = InlineLoc.isValid(); 5340 bool IsInvalid = false; 5341 bool IsStd = false; 5342 bool AddToKnown = false; 5343 Scope *DeclRegionScope = NamespcScope->getParent(); 5344 5345 NamespaceDecl *PrevNS = 0; 5346 if (II) { 5347 // C++ [namespace.def]p2: 5348 // The identifier in an original-namespace-definition shall not 5349 // have been previously defined in the declarative region in 5350 // which the original-namespace-definition appears. The 5351 // identifier in an original-namespace-definition is the name of 5352 // the namespace. Subsequently in that declarative region, it is 5353 // treated as an original-namespace-name. 5354 // 5355 // Since namespace names are unique in their scope, and we don't 5356 // look through using directives, just look for any ordinary names. 5357 5358 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5359 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5360 Decl::IDNS_Namespace; 5361 NamedDecl *PrevDecl = 0; 5362 for (DeclContext::lookup_result R 5363 = CurContext->getRedeclContext()->lookup(II); 5364 R.first != R.second; ++R.first) { 5365 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5366 PrevDecl = *R.first; 5367 break; 5368 } 5369 } 5370 5371 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5372 5373 if (PrevNS) { 5374 // This is an extended namespace definition. 5375 if (IsInline != PrevNS->isInline()) { 5376 // inline-ness must match 5377 if (PrevNS->isInline()) { 5378 // The user probably just forgot the 'inline', so suggest that it 5379 // be added back. 5380 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5381 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5382 } else { 5383 Diag(Loc, diag::err_inline_namespace_mismatch) 5384 << IsInline; 5385 } 5386 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5387 5388 IsInline = PrevNS->isInline(); 5389 } 5390 } else if (PrevDecl) { 5391 // This is an invalid name redefinition. 5392 Diag(Loc, diag::err_redefinition_different_kind) 5393 << II; 5394 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5395 IsInvalid = true; 5396 // Continue on to push Namespc as current DeclContext and return it. 5397 } else if (II->isStr("std") && 5398 CurContext->getRedeclContext()->isTranslationUnit()) { 5399 // This is the first "real" definition of the namespace "std", so update 5400 // our cache of the "std" namespace to point at this definition. 5401 PrevNS = getStdNamespace(); 5402 IsStd = true; 5403 AddToKnown = !IsInline; 5404 } else { 5405 // We've seen this namespace for the first time. 5406 AddToKnown = !IsInline; 5407 } 5408 } else { 5409 // Anonymous namespaces. 5410 5411 // Determine whether the parent already has an anonymous namespace. 5412 DeclContext *Parent = CurContext->getRedeclContext(); 5413 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5414 PrevNS = TU->getAnonymousNamespace(); 5415 } else { 5416 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5417 PrevNS = ND->getAnonymousNamespace(); 5418 } 5419 5420 if (PrevNS && IsInline != PrevNS->isInline()) { 5421 // inline-ness must match 5422 Diag(Loc, diag::err_inline_namespace_mismatch) 5423 << IsInline; 5424 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5425 5426 // Recover by ignoring the new namespace's inline status. 5427 IsInline = PrevNS->isInline(); 5428 } 5429 } 5430 5431 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5432 StartLoc, Loc, II, PrevNS); 5433 if (IsInvalid) 5434 Namespc->setInvalidDecl(); 5435 5436 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5437 5438 // FIXME: Should we be merging attributes? 5439 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5440 PushNamespaceVisibilityAttr(Attr, Loc); 5441 5442 if (IsStd) 5443 StdNamespace = Namespc; 5444 if (AddToKnown) 5445 KnownNamespaces[Namespc] = false; 5446 5447 if (II) { 5448 PushOnScopeChains(Namespc, DeclRegionScope); 5449 } else { 5450 // Link the anonymous namespace into its parent. 5451 DeclContext *Parent = CurContext->getRedeclContext(); 5452 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5453 TU->setAnonymousNamespace(Namespc); 5454 } else { 5455 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5456 } 5457 5458 CurContext->addDecl(Namespc); 5459 5460 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5461 // behaves as if it were replaced by 5462 // namespace unique { /* empty body */ } 5463 // using namespace unique; 5464 // namespace unique { namespace-body } 5465 // where all occurrences of 'unique' in a translation unit are 5466 // replaced by the same identifier and this identifier differs 5467 // from all other identifiers in the entire program. 5468 5469 // We just create the namespace with an empty name and then add an 5470 // implicit using declaration, just like the standard suggests. 5471 // 5472 // CodeGen enforces the "universally unique" aspect by giving all 5473 // declarations semantically contained within an anonymous 5474 // namespace internal linkage. 5475 5476 if (!PrevNS) { 5477 UsingDirectiveDecl* UD 5478 = UsingDirectiveDecl::Create(Context, CurContext, 5479 /* 'using' */ LBrace, 5480 /* 'namespace' */ SourceLocation(), 5481 /* qualifier */ NestedNameSpecifierLoc(), 5482 /* identifier */ SourceLocation(), 5483 Namespc, 5484 /* Ancestor */ CurContext); 5485 UD->setImplicit(); 5486 CurContext->addDecl(UD); 5487 } 5488 } 5489 5490 ActOnDocumentableDecl(Namespc); 5491 5492 // Although we could have an invalid decl (i.e. the namespace name is a 5493 // redefinition), push it as current DeclContext and try to continue parsing. 5494 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5495 // for the namespace has the declarations that showed up in that particular 5496 // namespace definition. 5497 PushDeclContext(NamespcScope, Namespc); 5498 return Namespc; 5499} 5500 5501/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5502/// is a namespace alias, returns the namespace it points to. 5503static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5504 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5505 return AD->getNamespace(); 5506 return dyn_cast_or_null<NamespaceDecl>(D); 5507} 5508 5509/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5510/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5511void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5512 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5513 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5514 Namespc->setRBraceLoc(RBrace); 5515 PopDeclContext(); 5516 if (Namespc->hasAttr<VisibilityAttr>()) 5517 PopPragmaVisibility(true, RBrace); 5518} 5519 5520CXXRecordDecl *Sema::getStdBadAlloc() const { 5521 return cast_or_null<CXXRecordDecl>( 5522 StdBadAlloc.get(Context.getExternalSource())); 5523} 5524 5525NamespaceDecl *Sema::getStdNamespace() const { 5526 return cast_or_null<NamespaceDecl>( 5527 StdNamespace.get(Context.getExternalSource())); 5528} 5529 5530/// \brief Retrieve the special "std" namespace, which may require us to 5531/// implicitly define the namespace. 5532NamespaceDecl *Sema::getOrCreateStdNamespace() { 5533 if (!StdNamespace) { 5534 // The "std" namespace has not yet been defined, so build one implicitly. 5535 StdNamespace = NamespaceDecl::Create(Context, 5536 Context.getTranslationUnitDecl(), 5537 /*Inline=*/false, 5538 SourceLocation(), SourceLocation(), 5539 &PP.getIdentifierTable().get("std"), 5540 /*PrevDecl=*/0); 5541 getStdNamespace()->setImplicit(true); 5542 } 5543 5544 return getStdNamespace(); 5545} 5546 5547bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5548 assert(getLangOpts().CPlusPlus && 5549 "Looking for std::initializer_list outside of C++."); 5550 5551 // We're looking for implicit instantiations of 5552 // template <typename E> class std::initializer_list. 5553 5554 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5555 return false; 5556 5557 ClassTemplateDecl *Template = 0; 5558 const TemplateArgument *Arguments = 0; 5559 5560 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5561 5562 ClassTemplateSpecializationDecl *Specialization = 5563 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5564 if (!Specialization) 5565 return false; 5566 5567 Template = Specialization->getSpecializedTemplate(); 5568 Arguments = Specialization->getTemplateArgs().data(); 5569 } else if (const TemplateSpecializationType *TST = 5570 Ty->getAs<TemplateSpecializationType>()) { 5571 Template = dyn_cast_or_null<ClassTemplateDecl>( 5572 TST->getTemplateName().getAsTemplateDecl()); 5573 Arguments = TST->getArgs(); 5574 } 5575 if (!Template) 5576 return false; 5577 5578 if (!StdInitializerList) { 5579 // Haven't recognized std::initializer_list yet, maybe this is it. 5580 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5581 if (TemplateClass->getIdentifier() != 5582 &PP.getIdentifierTable().get("initializer_list") || 5583 !getStdNamespace()->InEnclosingNamespaceSetOf( 5584 TemplateClass->getDeclContext())) 5585 return false; 5586 // This is a template called std::initializer_list, but is it the right 5587 // template? 5588 TemplateParameterList *Params = Template->getTemplateParameters(); 5589 if (Params->getMinRequiredArguments() != 1) 5590 return false; 5591 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5592 return false; 5593 5594 // It's the right template. 5595 StdInitializerList = Template; 5596 } 5597 5598 if (Template != StdInitializerList) 5599 return false; 5600 5601 // This is an instance of std::initializer_list. Find the argument type. 5602 if (Element) 5603 *Element = Arguments[0].getAsType(); 5604 return true; 5605} 5606 5607static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5608 NamespaceDecl *Std = S.getStdNamespace(); 5609 if (!Std) { 5610 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5611 return 0; 5612 } 5613 5614 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5615 Loc, Sema::LookupOrdinaryName); 5616 if (!S.LookupQualifiedName(Result, Std)) { 5617 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5618 return 0; 5619 } 5620 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5621 if (!Template) { 5622 Result.suppressDiagnostics(); 5623 // We found something weird. Complain about the first thing we found. 5624 NamedDecl *Found = *Result.begin(); 5625 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5626 return 0; 5627 } 5628 5629 // We found some template called std::initializer_list. Now verify that it's 5630 // correct. 5631 TemplateParameterList *Params = Template->getTemplateParameters(); 5632 if (Params->getMinRequiredArguments() != 1 || 5633 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5634 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5635 return 0; 5636 } 5637 5638 return Template; 5639} 5640 5641QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5642 if (!StdInitializerList) { 5643 StdInitializerList = LookupStdInitializerList(*this, Loc); 5644 if (!StdInitializerList) 5645 return QualType(); 5646 } 5647 5648 TemplateArgumentListInfo Args(Loc, Loc); 5649 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5650 Context.getTrivialTypeSourceInfo(Element, 5651 Loc))); 5652 return Context.getCanonicalType( 5653 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5654} 5655 5656bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5657 // C++ [dcl.init.list]p2: 5658 // A constructor is an initializer-list constructor if its first parameter 5659 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5660 // std::initializer_list<E> for some type E, and either there are no other 5661 // parameters or else all other parameters have default arguments. 5662 if (Ctor->getNumParams() < 1 || 5663 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5664 return false; 5665 5666 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5667 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5668 ArgType = RT->getPointeeType().getUnqualifiedType(); 5669 5670 return isStdInitializerList(ArgType, 0); 5671} 5672 5673/// \brief Determine whether a using statement is in a context where it will be 5674/// apply in all contexts. 5675static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5676 switch (CurContext->getDeclKind()) { 5677 case Decl::TranslationUnit: 5678 return true; 5679 case Decl::LinkageSpec: 5680 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5681 default: 5682 return false; 5683 } 5684} 5685 5686namespace { 5687 5688// Callback to only accept typo corrections that are namespaces. 5689class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5690 public: 5691 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5692 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5693 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5694 } 5695 return false; 5696 } 5697}; 5698 5699} 5700 5701static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5702 CXXScopeSpec &SS, 5703 SourceLocation IdentLoc, 5704 IdentifierInfo *Ident) { 5705 NamespaceValidatorCCC Validator; 5706 R.clear(); 5707 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5708 R.getLookupKind(), Sc, &SS, 5709 Validator)) { 5710 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5711 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5712 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5713 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5714 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5715 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5716 else 5717 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5718 << Ident << CorrectedQuotedStr 5719 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5720 5721 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5722 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5723 5724 R.addDecl(Corrected.getCorrectionDecl()); 5725 return true; 5726 } 5727 return false; 5728} 5729 5730Decl *Sema::ActOnUsingDirective(Scope *S, 5731 SourceLocation UsingLoc, 5732 SourceLocation NamespcLoc, 5733 CXXScopeSpec &SS, 5734 SourceLocation IdentLoc, 5735 IdentifierInfo *NamespcName, 5736 AttributeList *AttrList) { 5737 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5738 assert(NamespcName && "Invalid NamespcName."); 5739 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5740 5741 // This can only happen along a recovery path. 5742 while (S->getFlags() & Scope::TemplateParamScope) 5743 S = S->getParent(); 5744 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5745 5746 UsingDirectiveDecl *UDir = 0; 5747 NestedNameSpecifier *Qualifier = 0; 5748 if (SS.isSet()) 5749 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5750 5751 // Lookup namespace name. 5752 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5753 LookupParsedName(R, S, &SS); 5754 if (R.isAmbiguous()) 5755 return 0; 5756 5757 if (R.empty()) { 5758 R.clear(); 5759 // Allow "using namespace std;" or "using namespace ::std;" even if 5760 // "std" hasn't been defined yet, for GCC compatibility. 5761 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5762 NamespcName->isStr("std")) { 5763 Diag(IdentLoc, diag::ext_using_undefined_std); 5764 R.addDecl(getOrCreateStdNamespace()); 5765 R.resolveKind(); 5766 } 5767 // Otherwise, attempt typo correction. 5768 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5769 } 5770 5771 if (!R.empty()) { 5772 NamedDecl *Named = R.getFoundDecl(); 5773 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5774 && "expected namespace decl"); 5775 // C++ [namespace.udir]p1: 5776 // A using-directive specifies that the names in the nominated 5777 // namespace can be used in the scope in which the 5778 // using-directive appears after the using-directive. During 5779 // unqualified name lookup (3.4.1), the names appear as if they 5780 // were declared in the nearest enclosing namespace which 5781 // contains both the using-directive and the nominated 5782 // namespace. [Note: in this context, "contains" means "contains 5783 // directly or indirectly". ] 5784 5785 // Find enclosing context containing both using-directive and 5786 // nominated namespace. 5787 NamespaceDecl *NS = getNamespaceDecl(Named); 5788 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5789 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5790 CommonAncestor = CommonAncestor->getParent(); 5791 5792 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5793 SS.getWithLocInContext(Context), 5794 IdentLoc, Named, CommonAncestor); 5795 5796 if (IsUsingDirectiveInToplevelContext(CurContext) && 5797 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5798 Diag(IdentLoc, diag::warn_using_directive_in_header); 5799 } 5800 5801 PushUsingDirective(S, UDir); 5802 } else { 5803 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5804 } 5805 5806 // FIXME: We ignore attributes for now. 5807 return UDir; 5808} 5809 5810void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5811 // If the scope has an associated entity and the using directive is at 5812 // namespace or translation unit scope, add the UsingDirectiveDecl into 5813 // its lookup structure so qualified name lookup can find it. 5814 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5815 if (Ctx && !Ctx->isFunctionOrMethod()) 5816 Ctx->addDecl(UDir); 5817 else 5818 // Otherwise, it is at block sope. The using-directives will affect lookup 5819 // only to the end of the scope. 5820 S->PushUsingDirective(UDir); 5821} 5822 5823 5824Decl *Sema::ActOnUsingDeclaration(Scope *S, 5825 AccessSpecifier AS, 5826 bool HasUsingKeyword, 5827 SourceLocation UsingLoc, 5828 CXXScopeSpec &SS, 5829 UnqualifiedId &Name, 5830 AttributeList *AttrList, 5831 bool IsTypeName, 5832 SourceLocation TypenameLoc) { 5833 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5834 5835 switch (Name.getKind()) { 5836 case UnqualifiedId::IK_ImplicitSelfParam: 5837 case UnqualifiedId::IK_Identifier: 5838 case UnqualifiedId::IK_OperatorFunctionId: 5839 case UnqualifiedId::IK_LiteralOperatorId: 5840 case UnqualifiedId::IK_ConversionFunctionId: 5841 break; 5842 5843 case UnqualifiedId::IK_ConstructorName: 5844 case UnqualifiedId::IK_ConstructorTemplateId: 5845 // C++11 inheriting constructors. 5846 Diag(Name.getLocStart(), 5847 getLangOpts().CPlusPlus0x ? 5848 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5849 // instead once inheriting constructors work. 5850 diag::err_using_decl_constructor_unsupported : 5851 diag::err_using_decl_constructor) 5852 << SS.getRange(); 5853 5854 if (getLangOpts().CPlusPlus0x) break; 5855 5856 return 0; 5857 5858 case UnqualifiedId::IK_DestructorName: 5859 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5860 << SS.getRange(); 5861 return 0; 5862 5863 case UnqualifiedId::IK_TemplateId: 5864 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5865 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5866 return 0; 5867 } 5868 5869 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5870 DeclarationName TargetName = TargetNameInfo.getName(); 5871 if (!TargetName) 5872 return 0; 5873 5874 // Warn about using declarations. 5875 // TODO: store that the declaration was written without 'using' and 5876 // talk about access decls instead of using decls in the 5877 // diagnostics. 5878 if (!HasUsingKeyword) { 5879 UsingLoc = Name.getLocStart(); 5880 5881 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5882 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5883 } 5884 5885 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5886 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5887 return 0; 5888 5889 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5890 TargetNameInfo, AttrList, 5891 /* IsInstantiation */ false, 5892 IsTypeName, TypenameLoc); 5893 if (UD) 5894 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5895 5896 return UD; 5897} 5898 5899/// \brief Determine whether a using declaration considers the given 5900/// declarations as "equivalent", e.g., if they are redeclarations of 5901/// the same entity or are both typedefs of the same type. 5902static bool 5903IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5904 bool &SuppressRedeclaration) { 5905 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5906 SuppressRedeclaration = false; 5907 return true; 5908 } 5909 5910 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5911 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5912 SuppressRedeclaration = true; 5913 return Context.hasSameType(TD1->getUnderlyingType(), 5914 TD2->getUnderlyingType()); 5915 } 5916 5917 return false; 5918} 5919 5920 5921/// Determines whether to create a using shadow decl for a particular 5922/// decl, given the set of decls existing prior to this using lookup. 5923bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5924 const LookupResult &Previous) { 5925 // Diagnose finding a decl which is not from a base class of the 5926 // current class. We do this now because there are cases where this 5927 // function will silently decide not to build a shadow decl, which 5928 // will pre-empt further diagnostics. 5929 // 5930 // We don't need to do this in C++0x because we do the check once on 5931 // the qualifier. 5932 // 5933 // FIXME: diagnose the following if we care enough: 5934 // struct A { int foo; }; 5935 // struct B : A { using A::foo; }; 5936 // template <class T> struct C : A {}; 5937 // template <class T> struct D : C<T> { using B::foo; } // <--- 5938 // This is invalid (during instantiation) in C++03 because B::foo 5939 // resolves to the using decl in B, which is not a base class of D<T>. 5940 // We can't diagnose it immediately because C<T> is an unknown 5941 // specialization. The UsingShadowDecl in D<T> then points directly 5942 // to A::foo, which will look well-formed when we instantiate. 5943 // The right solution is to not collapse the shadow-decl chain. 5944 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5945 DeclContext *OrigDC = Orig->getDeclContext(); 5946 5947 // Handle enums and anonymous structs. 5948 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5949 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5950 while (OrigRec->isAnonymousStructOrUnion()) 5951 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5952 5953 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5954 if (OrigDC == CurContext) { 5955 Diag(Using->getLocation(), 5956 diag::err_using_decl_nested_name_specifier_is_current_class) 5957 << Using->getQualifierLoc().getSourceRange(); 5958 Diag(Orig->getLocation(), diag::note_using_decl_target); 5959 return true; 5960 } 5961 5962 Diag(Using->getQualifierLoc().getBeginLoc(), 5963 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5964 << Using->getQualifier() 5965 << cast<CXXRecordDecl>(CurContext) 5966 << Using->getQualifierLoc().getSourceRange(); 5967 Diag(Orig->getLocation(), diag::note_using_decl_target); 5968 return true; 5969 } 5970 } 5971 5972 if (Previous.empty()) return false; 5973 5974 NamedDecl *Target = Orig; 5975 if (isa<UsingShadowDecl>(Target)) 5976 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5977 5978 // If the target happens to be one of the previous declarations, we 5979 // don't have a conflict. 5980 // 5981 // FIXME: but we might be increasing its access, in which case we 5982 // should redeclare it. 5983 NamedDecl *NonTag = 0, *Tag = 0; 5984 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5985 I != E; ++I) { 5986 NamedDecl *D = (*I)->getUnderlyingDecl(); 5987 bool Result; 5988 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5989 return Result; 5990 5991 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5992 } 5993 5994 if (Target->isFunctionOrFunctionTemplate()) { 5995 FunctionDecl *FD; 5996 if (isa<FunctionTemplateDecl>(Target)) 5997 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5998 else 5999 FD = cast<FunctionDecl>(Target); 6000 6001 NamedDecl *OldDecl = 0; 6002 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6003 case Ovl_Overload: 6004 return false; 6005 6006 case Ovl_NonFunction: 6007 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6008 break; 6009 6010 // We found a decl with the exact signature. 6011 case Ovl_Match: 6012 // If we're in a record, we want to hide the target, so we 6013 // return true (without a diagnostic) to tell the caller not to 6014 // build a shadow decl. 6015 if (CurContext->isRecord()) 6016 return true; 6017 6018 // If we're not in a record, this is an error. 6019 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6020 break; 6021 } 6022 6023 Diag(Target->getLocation(), diag::note_using_decl_target); 6024 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6025 return true; 6026 } 6027 6028 // Target is not a function. 6029 6030 if (isa<TagDecl>(Target)) { 6031 // No conflict between a tag and a non-tag. 6032 if (!Tag) return false; 6033 6034 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6035 Diag(Target->getLocation(), diag::note_using_decl_target); 6036 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6037 return true; 6038 } 6039 6040 // No conflict between a tag and a non-tag. 6041 if (!NonTag) return false; 6042 6043 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6044 Diag(Target->getLocation(), diag::note_using_decl_target); 6045 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6046 return true; 6047} 6048 6049/// Builds a shadow declaration corresponding to a 'using' declaration. 6050UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6051 UsingDecl *UD, 6052 NamedDecl *Orig) { 6053 6054 // If we resolved to another shadow declaration, just coalesce them. 6055 NamedDecl *Target = Orig; 6056 if (isa<UsingShadowDecl>(Target)) { 6057 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6058 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6059 } 6060 6061 UsingShadowDecl *Shadow 6062 = UsingShadowDecl::Create(Context, CurContext, 6063 UD->getLocation(), UD, Target); 6064 UD->addShadowDecl(Shadow); 6065 6066 Shadow->setAccess(UD->getAccess()); 6067 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6068 Shadow->setInvalidDecl(); 6069 6070 if (S) 6071 PushOnScopeChains(Shadow, S); 6072 else 6073 CurContext->addDecl(Shadow); 6074 6075 6076 return Shadow; 6077} 6078 6079/// Hides a using shadow declaration. This is required by the current 6080/// using-decl implementation when a resolvable using declaration in a 6081/// class is followed by a declaration which would hide or override 6082/// one or more of the using decl's targets; for example: 6083/// 6084/// struct Base { void foo(int); }; 6085/// struct Derived : Base { 6086/// using Base::foo; 6087/// void foo(int); 6088/// }; 6089/// 6090/// The governing language is C++03 [namespace.udecl]p12: 6091/// 6092/// When a using-declaration brings names from a base class into a 6093/// derived class scope, member functions in the derived class 6094/// override and/or hide member functions with the same name and 6095/// parameter types in a base class (rather than conflicting). 6096/// 6097/// There are two ways to implement this: 6098/// (1) optimistically create shadow decls when they're not hidden 6099/// by existing declarations, or 6100/// (2) don't create any shadow decls (or at least don't make them 6101/// visible) until we've fully parsed/instantiated the class. 6102/// The problem with (1) is that we might have to retroactively remove 6103/// a shadow decl, which requires several O(n) operations because the 6104/// decl structures are (very reasonably) not designed for removal. 6105/// (2) avoids this but is very fiddly and phase-dependent. 6106void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6107 if (Shadow->getDeclName().getNameKind() == 6108 DeclarationName::CXXConversionFunctionName) 6109 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6110 6111 // Remove it from the DeclContext... 6112 Shadow->getDeclContext()->removeDecl(Shadow); 6113 6114 // ...and the scope, if applicable... 6115 if (S) { 6116 S->RemoveDecl(Shadow); 6117 IdResolver.RemoveDecl(Shadow); 6118 } 6119 6120 // ...and the using decl. 6121 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6122 6123 // TODO: complain somehow if Shadow was used. It shouldn't 6124 // be possible for this to happen, because...? 6125} 6126 6127/// Builds a using declaration. 6128/// 6129/// \param IsInstantiation - Whether this call arises from an 6130/// instantiation of an unresolved using declaration. We treat 6131/// the lookup differently for these declarations. 6132NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6133 SourceLocation UsingLoc, 6134 CXXScopeSpec &SS, 6135 const DeclarationNameInfo &NameInfo, 6136 AttributeList *AttrList, 6137 bool IsInstantiation, 6138 bool IsTypeName, 6139 SourceLocation TypenameLoc) { 6140 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6141 SourceLocation IdentLoc = NameInfo.getLoc(); 6142 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6143 6144 // FIXME: We ignore attributes for now. 6145 6146 if (SS.isEmpty()) { 6147 Diag(IdentLoc, diag::err_using_requires_qualname); 6148 return 0; 6149 } 6150 6151 // Do the redeclaration lookup in the current scope. 6152 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6153 ForRedeclaration); 6154 Previous.setHideTags(false); 6155 if (S) { 6156 LookupName(Previous, S); 6157 6158 // It is really dumb that we have to do this. 6159 LookupResult::Filter F = Previous.makeFilter(); 6160 while (F.hasNext()) { 6161 NamedDecl *D = F.next(); 6162 if (!isDeclInScope(D, CurContext, S)) 6163 F.erase(); 6164 } 6165 F.done(); 6166 } else { 6167 assert(IsInstantiation && "no scope in non-instantiation"); 6168 assert(CurContext->isRecord() && "scope not record in instantiation"); 6169 LookupQualifiedName(Previous, CurContext); 6170 } 6171 6172 // Check for invalid redeclarations. 6173 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6174 return 0; 6175 6176 // Check for bad qualifiers. 6177 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6178 return 0; 6179 6180 DeclContext *LookupContext = computeDeclContext(SS); 6181 NamedDecl *D; 6182 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6183 if (!LookupContext) { 6184 if (IsTypeName) { 6185 // FIXME: not all declaration name kinds are legal here 6186 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6187 UsingLoc, TypenameLoc, 6188 QualifierLoc, 6189 IdentLoc, NameInfo.getName()); 6190 } else { 6191 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6192 QualifierLoc, NameInfo); 6193 } 6194 } else { 6195 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6196 NameInfo, IsTypeName); 6197 } 6198 D->setAccess(AS); 6199 CurContext->addDecl(D); 6200 6201 if (!LookupContext) return D; 6202 UsingDecl *UD = cast<UsingDecl>(D); 6203 6204 if (RequireCompleteDeclContext(SS, LookupContext)) { 6205 UD->setInvalidDecl(); 6206 return UD; 6207 } 6208 6209 // The normal rules do not apply to inheriting constructor declarations. 6210 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6211 if (CheckInheritingConstructorUsingDecl(UD)) 6212 UD->setInvalidDecl(); 6213 return UD; 6214 } 6215 6216 // Otherwise, look up the target name. 6217 6218 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6219 6220 // Unlike most lookups, we don't always want to hide tag 6221 // declarations: tag names are visible through the using declaration 6222 // even if hidden by ordinary names, *except* in a dependent context 6223 // where it's important for the sanity of two-phase lookup. 6224 if (!IsInstantiation) 6225 R.setHideTags(false); 6226 6227 // For the purposes of this lookup, we have a base object type 6228 // equal to that of the current context. 6229 if (CurContext->isRecord()) { 6230 R.setBaseObjectType( 6231 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6232 } 6233 6234 LookupQualifiedName(R, LookupContext); 6235 6236 if (R.empty()) { 6237 Diag(IdentLoc, diag::err_no_member) 6238 << NameInfo.getName() << LookupContext << SS.getRange(); 6239 UD->setInvalidDecl(); 6240 return UD; 6241 } 6242 6243 if (R.isAmbiguous()) { 6244 UD->setInvalidDecl(); 6245 return UD; 6246 } 6247 6248 if (IsTypeName) { 6249 // If we asked for a typename and got a non-type decl, error out. 6250 if (!R.getAsSingle<TypeDecl>()) { 6251 Diag(IdentLoc, diag::err_using_typename_non_type); 6252 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6253 Diag((*I)->getUnderlyingDecl()->getLocation(), 6254 diag::note_using_decl_target); 6255 UD->setInvalidDecl(); 6256 return UD; 6257 } 6258 } else { 6259 // If we asked for a non-typename and we got a type, error out, 6260 // but only if this is an instantiation of an unresolved using 6261 // decl. Otherwise just silently find the type name. 6262 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6263 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6264 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6265 UD->setInvalidDecl(); 6266 return UD; 6267 } 6268 } 6269 6270 // C++0x N2914 [namespace.udecl]p6: 6271 // A using-declaration shall not name a namespace. 6272 if (R.getAsSingle<NamespaceDecl>()) { 6273 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6274 << SS.getRange(); 6275 UD->setInvalidDecl(); 6276 return UD; 6277 } 6278 6279 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6280 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6281 BuildUsingShadowDecl(S, UD, *I); 6282 } 6283 6284 return UD; 6285} 6286 6287/// Additional checks for a using declaration referring to a constructor name. 6288bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6289 assert(!UD->isTypeName() && "expecting a constructor name"); 6290 6291 const Type *SourceType = UD->getQualifier()->getAsType(); 6292 assert(SourceType && 6293 "Using decl naming constructor doesn't have type in scope spec."); 6294 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6295 6296 // Check whether the named type is a direct base class. 6297 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6298 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6299 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6300 BaseIt != BaseE; ++BaseIt) { 6301 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6302 if (CanonicalSourceType == BaseType) 6303 break; 6304 if (BaseIt->getType()->isDependentType()) 6305 break; 6306 } 6307 6308 if (BaseIt == BaseE) { 6309 // Did not find SourceType in the bases. 6310 Diag(UD->getUsingLocation(), 6311 diag::err_using_decl_constructor_not_in_direct_base) 6312 << UD->getNameInfo().getSourceRange() 6313 << QualType(SourceType, 0) << TargetClass; 6314 return true; 6315 } 6316 6317 if (!CurContext->isDependentContext()) 6318 BaseIt->setInheritConstructors(); 6319 6320 return false; 6321} 6322 6323/// Checks that the given using declaration is not an invalid 6324/// redeclaration. Note that this is checking only for the using decl 6325/// itself, not for any ill-formedness among the UsingShadowDecls. 6326bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6327 bool isTypeName, 6328 const CXXScopeSpec &SS, 6329 SourceLocation NameLoc, 6330 const LookupResult &Prev) { 6331 // C++03 [namespace.udecl]p8: 6332 // C++0x [namespace.udecl]p10: 6333 // A using-declaration is a declaration and can therefore be used 6334 // repeatedly where (and only where) multiple declarations are 6335 // allowed. 6336 // 6337 // That's in non-member contexts. 6338 if (!CurContext->getRedeclContext()->isRecord()) 6339 return false; 6340 6341 NestedNameSpecifier *Qual 6342 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6343 6344 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6345 NamedDecl *D = *I; 6346 6347 bool DTypename; 6348 NestedNameSpecifier *DQual; 6349 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6350 DTypename = UD->isTypeName(); 6351 DQual = UD->getQualifier(); 6352 } else if (UnresolvedUsingValueDecl *UD 6353 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6354 DTypename = false; 6355 DQual = UD->getQualifier(); 6356 } else if (UnresolvedUsingTypenameDecl *UD 6357 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6358 DTypename = true; 6359 DQual = UD->getQualifier(); 6360 } else continue; 6361 6362 // using decls differ if one says 'typename' and the other doesn't. 6363 // FIXME: non-dependent using decls? 6364 if (isTypeName != DTypename) continue; 6365 6366 // using decls differ if they name different scopes (but note that 6367 // template instantiation can cause this check to trigger when it 6368 // didn't before instantiation). 6369 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6370 Context.getCanonicalNestedNameSpecifier(DQual)) 6371 continue; 6372 6373 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6374 Diag(D->getLocation(), diag::note_using_decl) << 1; 6375 return true; 6376 } 6377 6378 return false; 6379} 6380 6381 6382/// Checks that the given nested-name qualifier used in a using decl 6383/// in the current context is appropriately related to the current 6384/// scope. If an error is found, diagnoses it and returns true. 6385bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6386 const CXXScopeSpec &SS, 6387 SourceLocation NameLoc) { 6388 DeclContext *NamedContext = computeDeclContext(SS); 6389 6390 if (!CurContext->isRecord()) { 6391 // C++03 [namespace.udecl]p3: 6392 // C++0x [namespace.udecl]p8: 6393 // A using-declaration for a class member shall be a member-declaration. 6394 6395 // If we weren't able to compute a valid scope, it must be a 6396 // dependent class scope. 6397 if (!NamedContext || NamedContext->isRecord()) { 6398 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6399 << SS.getRange(); 6400 return true; 6401 } 6402 6403 // Otherwise, everything is known to be fine. 6404 return false; 6405 } 6406 6407 // The current scope is a record. 6408 6409 // If the named context is dependent, we can't decide much. 6410 if (!NamedContext) { 6411 // FIXME: in C++0x, we can diagnose if we can prove that the 6412 // nested-name-specifier does not refer to a base class, which is 6413 // still possible in some cases. 6414 6415 // Otherwise we have to conservatively report that things might be 6416 // okay. 6417 return false; 6418 } 6419 6420 if (!NamedContext->isRecord()) { 6421 // Ideally this would point at the last name in the specifier, 6422 // but we don't have that level of source info. 6423 Diag(SS.getRange().getBegin(), 6424 diag::err_using_decl_nested_name_specifier_is_not_class) 6425 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6426 return true; 6427 } 6428 6429 if (!NamedContext->isDependentContext() && 6430 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6431 return true; 6432 6433 if (getLangOpts().CPlusPlus0x) { 6434 // C++0x [namespace.udecl]p3: 6435 // In a using-declaration used as a member-declaration, the 6436 // nested-name-specifier shall name a base class of the class 6437 // being defined. 6438 6439 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6440 cast<CXXRecordDecl>(NamedContext))) { 6441 if (CurContext == NamedContext) { 6442 Diag(NameLoc, 6443 diag::err_using_decl_nested_name_specifier_is_current_class) 6444 << SS.getRange(); 6445 return true; 6446 } 6447 6448 Diag(SS.getRange().getBegin(), 6449 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6450 << (NestedNameSpecifier*) SS.getScopeRep() 6451 << cast<CXXRecordDecl>(CurContext) 6452 << SS.getRange(); 6453 return true; 6454 } 6455 6456 return false; 6457 } 6458 6459 // C++03 [namespace.udecl]p4: 6460 // A using-declaration used as a member-declaration shall refer 6461 // to a member of a base class of the class being defined [etc.]. 6462 6463 // Salient point: SS doesn't have to name a base class as long as 6464 // lookup only finds members from base classes. Therefore we can 6465 // diagnose here only if we can prove that that can't happen, 6466 // i.e. if the class hierarchies provably don't intersect. 6467 6468 // TODO: it would be nice if "definitely valid" results were cached 6469 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6470 // need to be repeated. 6471 6472 struct UserData { 6473 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6474 6475 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6476 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6477 Data->Bases.insert(Base); 6478 return true; 6479 } 6480 6481 bool hasDependentBases(const CXXRecordDecl *Class) { 6482 return !Class->forallBases(collect, this); 6483 } 6484 6485 /// Returns true if the base is dependent or is one of the 6486 /// accumulated base classes. 6487 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6488 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6489 return !Data->Bases.count(Base); 6490 } 6491 6492 bool mightShareBases(const CXXRecordDecl *Class) { 6493 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6494 } 6495 }; 6496 6497 UserData Data; 6498 6499 // Returns false if we find a dependent base. 6500 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6501 return false; 6502 6503 // Returns false if the class has a dependent base or if it or one 6504 // of its bases is present in the base set of the current context. 6505 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6506 return false; 6507 6508 Diag(SS.getRange().getBegin(), 6509 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6510 << (NestedNameSpecifier*) SS.getScopeRep() 6511 << cast<CXXRecordDecl>(CurContext) 6512 << SS.getRange(); 6513 6514 return true; 6515} 6516 6517Decl *Sema::ActOnAliasDeclaration(Scope *S, 6518 AccessSpecifier AS, 6519 MultiTemplateParamsArg TemplateParamLists, 6520 SourceLocation UsingLoc, 6521 UnqualifiedId &Name, 6522 TypeResult Type) { 6523 // Skip up to the relevant declaration scope. 6524 while (S->getFlags() & Scope::TemplateParamScope) 6525 S = S->getParent(); 6526 assert((S->getFlags() & Scope::DeclScope) && 6527 "got alias-declaration outside of declaration scope"); 6528 6529 if (Type.isInvalid()) 6530 return 0; 6531 6532 bool Invalid = false; 6533 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6534 TypeSourceInfo *TInfo = 0; 6535 GetTypeFromParser(Type.get(), &TInfo); 6536 6537 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6538 return 0; 6539 6540 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6541 UPPC_DeclarationType)) { 6542 Invalid = true; 6543 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6544 TInfo->getTypeLoc().getBeginLoc()); 6545 } 6546 6547 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6548 LookupName(Previous, S); 6549 6550 // Warn about shadowing the name of a template parameter. 6551 if (Previous.isSingleResult() && 6552 Previous.getFoundDecl()->isTemplateParameter()) { 6553 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6554 Previous.clear(); 6555 } 6556 6557 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6558 "name in alias declaration must be an identifier"); 6559 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6560 Name.StartLocation, 6561 Name.Identifier, TInfo); 6562 6563 NewTD->setAccess(AS); 6564 6565 if (Invalid) 6566 NewTD->setInvalidDecl(); 6567 6568 CheckTypedefForVariablyModifiedType(S, NewTD); 6569 Invalid |= NewTD->isInvalidDecl(); 6570 6571 bool Redeclaration = false; 6572 6573 NamedDecl *NewND; 6574 if (TemplateParamLists.size()) { 6575 TypeAliasTemplateDecl *OldDecl = 0; 6576 TemplateParameterList *OldTemplateParams = 0; 6577 6578 if (TemplateParamLists.size() != 1) { 6579 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6580 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6581 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6582 } 6583 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6584 6585 // Only consider previous declarations in the same scope. 6586 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6587 /*ExplicitInstantiationOrSpecialization*/false); 6588 if (!Previous.empty()) { 6589 Redeclaration = true; 6590 6591 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6592 if (!OldDecl && !Invalid) { 6593 Diag(UsingLoc, diag::err_redefinition_different_kind) 6594 << Name.Identifier; 6595 6596 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6597 if (OldD->getLocation().isValid()) 6598 Diag(OldD->getLocation(), diag::note_previous_definition); 6599 6600 Invalid = true; 6601 } 6602 6603 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6604 if (TemplateParameterListsAreEqual(TemplateParams, 6605 OldDecl->getTemplateParameters(), 6606 /*Complain=*/true, 6607 TPL_TemplateMatch)) 6608 OldTemplateParams = OldDecl->getTemplateParameters(); 6609 else 6610 Invalid = true; 6611 6612 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6613 if (!Invalid && 6614 !Context.hasSameType(OldTD->getUnderlyingType(), 6615 NewTD->getUnderlyingType())) { 6616 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6617 // but we can't reasonably accept it. 6618 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6619 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6620 if (OldTD->getLocation().isValid()) 6621 Diag(OldTD->getLocation(), diag::note_previous_definition); 6622 Invalid = true; 6623 } 6624 } 6625 } 6626 6627 // Merge any previous default template arguments into our parameters, 6628 // and check the parameter list. 6629 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6630 TPC_TypeAliasTemplate)) 6631 return 0; 6632 6633 TypeAliasTemplateDecl *NewDecl = 6634 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6635 Name.Identifier, TemplateParams, 6636 NewTD); 6637 6638 NewDecl->setAccess(AS); 6639 6640 if (Invalid) 6641 NewDecl->setInvalidDecl(); 6642 else if (OldDecl) 6643 NewDecl->setPreviousDeclaration(OldDecl); 6644 6645 NewND = NewDecl; 6646 } else { 6647 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6648 NewND = NewTD; 6649 } 6650 6651 if (!Redeclaration) 6652 PushOnScopeChains(NewND, S); 6653 6654 ActOnDocumentableDecl(NewND); 6655 return NewND; 6656} 6657 6658Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6659 SourceLocation NamespaceLoc, 6660 SourceLocation AliasLoc, 6661 IdentifierInfo *Alias, 6662 CXXScopeSpec &SS, 6663 SourceLocation IdentLoc, 6664 IdentifierInfo *Ident) { 6665 6666 // Lookup the namespace name. 6667 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6668 LookupParsedName(R, S, &SS); 6669 6670 // Check if we have a previous declaration with the same name. 6671 NamedDecl *PrevDecl 6672 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6673 ForRedeclaration); 6674 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6675 PrevDecl = 0; 6676 6677 if (PrevDecl) { 6678 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6679 // We already have an alias with the same name that points to the same 6680 // namespace, so don't create a new one. 6681 // FIXME: At some point, we'll want to create the (redundant) 6682 // declaration to maintain better source information. 6683 if (!R.isAmbiguous() && !R.empty() && 6684 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6685 return 0; 6686 } 6687 6688 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6689 diag::err_redefinition_different_kind; 6690 Diag(AliasLoc, DiagID) << Alias; 6691 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6692 return 0; 6693 } 6694 6695 if (R.isAmbiguous()) 6696 return 0; 6697 6698 if (R.empty()) { 6699 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6700 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6701 return 0; 6702 } 6703 } 6704 6705 NamespaceAliasDecl *AliasDecl = 6706 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6707 Alias, SS.getWithLocInContext(Context), 6708 IdentLoc, R.getFoundDecl()); 6709 6710 PushOnScopeChains(AliasDecl, S); 6711 return AliasDecl; 6712} 6713 6714namespace { 6715 /// \brief Scoped object used to handle the state changes required in Sema 6716 /// to implicitly define the body of a C++ member function; 6717 class ImplicitlyDefinedFunctionScope { 6718 Sema &S; 6719 Sema::ContextRAII SavedContext; 6720 6721 public: 6722 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6723 : S(S), SavedContext(S, Method) 6724 { 6725 S.PushFunctionScope(); 6726 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6727 } 6728 6729 ~ImplicitlyDefinedFunctionScope() { 6730 S.PopExpressionEvaluationContext(); 6731 S.PopFunctionScopeInfo(); 6732 } 6733 }; 6734} 6735 6736Sema::ImplicitExceptionSpecification 6737Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6738 CXXMethodDecl *MD) { 6739 CXXRecordDecl *ClassDecl = MD->getParent(); 6740 6741 // C++ [except.spec]p14: 6742 // An implicitly declared special member function (Clause 12) shall have an 6743 // exception-specification. [...] 6744 ImplicitExceptionSpecification ExceptSpec(*this); 6745 if (ClassDecl->isInvalidDecl()) 6746 return ExceptSpec; 6747 6748 // Direct base-class constructors. 6749 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6750 BEnd = ClassDecl->bases_end(); 6751 B != BEnd; ++B) { 6752 if (B->isVirtual()) // Handled below. 6753 continue; 6754 6755 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6756 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6757 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6758 // If this is a deleted function, add it anyway. This might be conformant 6759 // with the standard. This might not. I'm not sure. It might not matter. 6760 if (Constructor) 6761 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6762 } 6763 } 6764 6765 // Virtual base-class constructors. 6766 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6767 BEnd = ClassDecl->vbases_end(); 6768 B != BEnd; ++B) { 6769 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6770 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6771 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6772 // If this is a deleted function, add it anyway. This might be conformant 6773 // with the standard. This might not. I'm not sure. It might not matter. 6774 if (Constructor) 6775 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6776 } 6777 } 6778 6779 // Field constructors. 6780 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6781 FEnd = ClassDecl->field_end(); 6782 F != FEnd; ++F) { 6783 if (F->hasInClassInitializer()) { 6784 if (Expr *E = F->getInClassInitializer()) 6785 ExceptSpec.CalledExpr(E); 6786 else if (!F->isInvalidDecl()) 6787 // DR1351: 6788 // If the brace-or-equal-initializer of a non-static data member 6789 // invokes a defaulted default constructor of its class or of an 6790 // enclosing class in a potentially evaluated subexpression, the 6791 // program is ill-formed. 6792 // 6793 // This resolution is unworkable: the exception specification of the 6794 // default constructor can be needed in an unevaluated context, in 6795 // particular, in the operand of a noexcept-expression, and we can be 6796 // unable to compute an exception specification for an enclosed class. 6797 // 6798 // We do not allow an in-class initializer to require the evaluation 6799 // of the exception specification for any in-class initializer whose 6800 // definition is not lexically complete. 6801 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6802 } else if (const RecordType *RecordTy 6803 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6804 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6805 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6806 // If this is a deleted function, add it anyway. This might be conformant 6807 // with the standard. This might not. I'm not sure. It might not matter. 6808 // In particular, the problem is that this function never gets called. It 6809 // might just be ill-formed because this function attempts to refer to 6810 // a deleted function here. 6811 if (Constructor) 6812 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6813 } 6814 } 6815 6816 return ExceptSpec; 6817} 6818 6819CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6820 CXXRecordDecl *ClassDecl) { 6821 // C++ [class.ctor]p5: 6822 // A default constructor for a class X is a constructor of class X 6823 // that can be called without an argument. If there is no 6824 // user-declared constructor for class X, a default constructor is 6825 // implicitly declared. An implicitly-declared default constructor 6826 // is an inline public member of its class. 6827 assert(!ClassDecl->hasUserDeclaredConstructor() && 6828 "Should not build implicit default constructor!"); 6829 6830 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6831 CXXDefaultConstructor, 6832 false); 6833 6834 // Create the actual constructor declaration. 6835 CanQualType ClassType 6836 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6837 SourceLocation ClassLoc = ClassDecl->getLocation(); 6838 DeclarationName Name 6839 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6840 DeclarationNameInfo NameInfo(Name, ClassLoc); 6841 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6842 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6843 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6844 Constexpr); 6845 DefaultCon->setAccess(AS_public); 6846 DefaultCon->setDefaulted(); 6847 DefaultCon->setImplicit(); 6848 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6849 6850 // Build an exception specification pointing back at this constructor. 6851 FunctionProtoType::ExtProtoInfo EPI; 6852 EPI.ExceptionSpecType = EST_Unevaluated; 6853 EPI.ExceptionSpecDecl = DefaultCon; 6854 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6855 6856 // Note that we have declared this constructor. 6857 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6858 6859 if (Scope *S = getScopeForContext(ClassDecl)) 6860 PushOnScopeChains(DefaultCon, S, false); 6861 ClassDecl->addDecl(DefaultCon); 6862 6863 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6864 DefaultCon->setDeletedAsWritten(); 6865 6866 return DefaultCon; 6867} 6868 6869void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6870 CXXConstructorDecl *Constructor) { 6871 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6872 !Constructor->doesThisDeclarationHaveABody() && 6873 !Constructor->isDeleted()) && 6874 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6875 6876 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6877 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6878 6879 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6880 DiagnosticErrorTrap Trap(Diags); 6881 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6882 Trap.hasErrorOccurred()) { 6883 Diag(CurrentLocation, diag::note_member_synthesized_at) 6884 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6885 Constructor->setInvalidDecl(); 6886 return; 6887 } 6888 6889 SourceLocation Loc = Constructor->getLocation(); 6890 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6891 6892 Constructor->setUsed(); 6893 MarkVTableUsed(CurrentLocation, ClassDecl); 6894 6895 if (ASTMutationListener *L = getASTMutationListener()) { 6896 L->CompletedImplicitDefinition(Constructor); 6897 } 6898} 6899 6900void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6901 if (!D) return; 6902 AdjustDeclIfTemplate(D); 6903 6904 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6905 6906 if (!ClassDecl->isDependentType()) 6907 CheckExplicitlyDefaultedMethods(ClassDecl); 6908} 6909 6910void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6911 // We start with an initial pass over the base classes to collect those that 6912 // inherit constructors from. If there are none, we can forgo all further 6913 // processing. 6914 typedef SmallVector<const RecordType *, 4> BasesVector; 6915 BasesVector BasesToInheritFrom; 6916 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6917 BaseE = ClassDecl->bases_end(); 6918 BaseIt != BaseE; ++BaseIt) { 6919 if (BaseIt->getInheritConstructors()) { 6920 QualType Base = BaseIt->getType(); 6921 if (Base->isDependentType()) { 6922 // If we inherit constructors from anything that is dependent, just 6923 // abort processing altogether. We'll get another chance for the 6924 // instantiations. 6925 return; 6926 } 6927 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6928 } 6929 } 6930 if (BasesToInheritFrom.empty()) 6931 return; 6932 6933 // Now collect the constructors that we already have in the current class. 6934 // Those take precedence over inherited constructors. 6935 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6936 // unless there is a user-declared constructor with the same signature in 6937 // the class where the using-declaration appears. 6938 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6939 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6940 CtorE = ClassDecl->ctor_end(); 6941 CtorIt != CtorE; ++CtorIt) { 6942 ExistingConstructors.insert( 6943 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6944 } 6945 6946 DeclarationName CreatedCtorName = 6947 Context.DeclarationNames.getCXXConstructorName( 6948 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6949 6950 // Now comes the true work. 6951 // First, we keep a map from constructor types to the base that introduced 6952 // them. Needed for finding conflicting constructors. We also keep the 6953 // actually inserted declarations in there, for pretty diagnostics. 6954 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6955 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6956 ConstructorToSourceMap InheritedConstructors; 6957 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6958 BaseE = BasesToInheritFrom.end(); 6959 BaseIt != BaseE; ++BaseIt) { 6960 const RecordType *Base = *BaseIt; 6961 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6962 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6963 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6964 CtorE = BaseDecl->ctor_end(); 6965 CtorIt != CtorE; ++CtorIt) { 6966 // Find the using declaration for inheriting this base's constructors. 6967 // FIXME: Don't perform name lookup just to obtain a source location! 6968 DeclarationName Name = 6969 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6970 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6971 LookupQualifiedName(Result, CurContext); 6972 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6973 SourceLocation UsingLoc = UD ? UD->getLocation() : 6974 ClassDecl->getLocation(); 6975 6976 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6977 // from the class X named in the using-declaration consists of actual 6978 // constructors and notional constructors that result from the 6979 // transformation of defaulted parameters as follows: 6980 // - all non-template default constructors of X, and 6981 // - for each non-template constructor of X that has at least one 6982 // parameter with a default argument, the set of constructors that 6983 // results from omitting any ellipsis parameter specification and 6984 // successively omitting parameters with a default argument from the 6985 // end of the parameter-type-list. 6986 CXXConstructorDecl *BaseCtor = *CtorIt; 6987 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6988 const FunctionProtoType *BaseCtorType = 6989 BaseCtor->getType()->getAs<FunctionProtoType>(); 6990 6991 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6992 maxParams = BaseCtor->getNumParams(); 6993 params <= maxParams; ++params) { 6994 // Skip default constructors. They're never inherited. 6995 if (params == 0) 6996 continue; 6997 // Skip copy and move constructors for the same reason. 6998 if (CanBeCopyOrMove && params == 1) 6999 continue; 7000 7001 // Build up a function type for this particular constructor. 7002 // FIXME: The working paper does not consider that the exception spec 7003 // for the inheriting constructor might be larger than that of the 7004 // source. This code doesn't yet, either. When it does, this code will 7005 // need to be delayed until after exception specifications and in-class 7006 // member initializers are attached. 7007 const Type *NewCtorType; 7008 if (params == maxParams) 7009 NewCtorType = BaseCtorType; 7010 else { 7011 SmallVector<QualType, 16> Args; 7012 for (unsigned i = 0; i < params; ++i) { 7013 Args.push_back(BaseCtorType->getArgType(i)); 7014 } 7015 FunctionProtoType::ExtProtoInfo ExtInfo = 7016 BaseCtorType->getExtProtoInfo(); 7017 ExtInfo.Variadic = false; 7018 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7019 Args.data(), params, ExtInfo) 7020 .getTypePtr(); 7021 } 7022 const Type *CanonicalNewCtorType = 7023 Context.getCanonicalType(NewCtorType); 7024 7025 // Now that we have the type, first check if the class already has a 7026 // constructor with this signature. 7027 if (ExistingConstructors.count(CanonicalNewCtorType)) 7028 continue; 7029 7030 // Then we check if we have already declared an inherited constructor 7031 // with this signature. 7032 std::pair<ConstructorToSourceMap::iterator, bool> result = 7033 InheritedConstructors.insert(std::make_pair( 7034 CanonicalNewCtorType, 7035 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7036 if (!result.second) { 7037 // Already in the map. If it came from a different class, that's an 7038 // error. Not if it's from the same. 7039 CanQualType PreviousBase = result.first->second.first; 7040 if (CanonicalBase != PreviousBase) { 7041 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7042 const CXXConstructorDecl *PrevBaseCtor = 7043 PrevCtor->getInheritedConstructor(); 7044 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7045 7046 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7047 Diag(BaseCtor->getLocation(), 7048 diag::note_using_decl_constructor_conflict_current_ctor); 7049 Diag(PrevBaseCtor->getLocation(), 7050 diag::note_using_decl_constructor_conflict_previous_ctor); 7051 Diag(PrevCtor->getLocation(), 7052 diag::note_using_decl_constructor_conflict_previous_using); 7053 } 7054 continue; 7055 } 7056 7057 // OK, we're there, now add the constructor. 7058 // C++0x [class.inhctor]p8: [...] that would be performed by a 7059 // user-written inline constructor [...] 7060 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7061 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7062 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7063 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7064 /*ImplicitlyDeclared=*/true, 7065 // FIXME: Due to a defect in the standard, we treat inherited 7066 // constructors as constexpr even if that makes them ill-formed. 7067 /*Constexpr=*/BaseCtor->isConstexpr()); 7068 NewCtor->setAccess(BaseCtor->getAccess()); 7069 7070 // Build up the parameter decls and add them. 7071 SmallVector<ParmVarDecl *, 16> ParamDecls; 7072 for (unsigned i = 0; i < params; ++i) { 7073 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7074 UsingLoc, UsingLoc, 7075 /*IdentifierInfo=*/0, 7076 BaseCtorType->getArgType(i), 7077 /*TInfo=*/0, SC_None, 7078 SC_None, /*DefaultArg=*/0)); 7079 } 7080 NewCtor->setParams(ParamDecls); 7081 NewCtor->setInheritedConstructor(BaseCtor); 7082 7083 ClassDecl->addDecl(NewCtor); 7084 result.first->second.second = NewCtor; 7085 } 7086 } 7087 } 7088} 7089 7090Sema::ImplicitExceptionSpecification 7091Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7092 CXXRecordDecl *ClassDecl = MD->getParent(); 7093 7094 // C++ [except.spec]p14: 7095 // An implicitly declared special member function (Clause 12) shall have 7096 // an exception-specification. 7097 ImplicitExceptionSpecification ExceptSpec(*this); 7098 if (ClassDecl->isInvalidDecl()) 7099 return ExceptSpec; 7100 7101 // Direct base-class destructors. 7102 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7103 BEnd = ClassDecl->bases_end(); 7104 B != BEnd; ++B) { 7105 if (B->isVirtual()) // Handled below. 7106 continue; 7107 7108 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7109 ExceptSpec.CalledDecl(B->getLocStart(), 7110 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7111 } 7112 7113 // Virtual base-class destructors. 7114 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7115 BEnd = ClassDecl->vbases_end(); 7116 B != BEnd; ++B) { 7117 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7118 ExceptSpec.CalledDecl(B->getLocStart(), 7119 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7120 } 7121 7122 // Field destructors. 7123 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7124 FEnd = ClassDecl->field_end(); 7125 F != FEnd; ++F) { 7126 if (const RecordType *RecordTy 7127 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7128 ExceptSpec.CalledDecl(F->getLocation(), 7129 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7130 } 7131 7132 return ExceptSpec; 7133} 7134 7135CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7136 // C++ [class.dtor]p2: 7137 // If a class has no user-declared destructor, a destructor is 7138 // declared implicitly. An implicitly-declared destructor is an 7139 // inline public member of its class. 7140 7141 // Create the actual destructor declaration. 7142 CanQualType ClassType 7143 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7144 SourceLocation ClassLoc = ClassDecl->getLocation(); 7145 DeclarationName Name 7146 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7147 DeclarationNameInfo NameInfo(Name, ClassLoc); 7148 CXXDestructorDecl *Destructor 7149 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7150 QualType(), 0, /*isInline=*/true, 7151 /*isImplicitlyDeclared=*/true); 7152 Destructor->setAccess(AS_public); 7153 Destructor->setDefaulted(); 7154 Destructor->setImplicit(); 7155 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7156 7157 // Build an exception specification pointing back at this destructor. 7158 FunctionProtoType::ExtProtoInfo EPI; 7159 EPI.ExceptionSpecType = EST_Unevaluated; 7160 EPI.ExceptionSpecDecl = Destructor; 7161 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7162 7163 // Note that we have declared this destructor. 7164 ++ASTContext::NumImplicitDestructorsDeclared; 7165 7166 // Introduce this destructor into its scope. 7167 if (Scope *S = getScopeForContext(ClassDecl)) 7168 PushOnScopeChains(Destructor, S, false); 7169 ClassDecl->addDecl(Destructor); 7170 7171 AddOverriddenMethods(ClassDecl, Destructor); 7172 7173 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7174 Destructor->setDeletedAsWritten(); 7175 7176 return Destructor; 7177} 7178 7179void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7180 CXXDestructorDecl *Destructor) { 7181 assert((Destructor->isDefaulted() && 7182 !Destructor->doesThisDeclarationHaveABody() && 7183 !Destructor->isDeleted()) && 7184 "DefineImplicitDestructor - call it for implicit default dtor"); 7185 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7186 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7187 7188 if (Destructor->isInvalidDecl()) 7189 return; 7190 7191 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7192 7193 DiagnosticErrorTrap Trap(Diags); 7194 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7195 Destructor->getParent()); 7196 7197 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7198 Diag(CurrentLocation, diag::note_member_synthesized_at) 7199 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7200 7201 Destructor->setInvalidDecl(); 7202 return; 7203 } 7204 7205 SourceLocation Loc = Destructor->getLocation(); 7206 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7207 Destructor->setImplicitlyDefined(true); 7208 Destructor->setUsed(); 7209 MarkVTableUsed(CurrentLocation, ClassDecl); 7210 7211 if (ASTMutationListener *L = getASTMutationListener()) { 7212 L->CompletedImplicitDefinition(Destructor); 7213 } 7214} 7215 7216/// \brief Perform any semantic analysis which needs to be delayed until all 7217/// pending class member declarations have been parsed. 7218void Sema::ActOnFinishCXXMemberDecls() { 7219 // Perform any deferred checking of exception specifications for virtual 7220 // destructors. 7221 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7222 i != e; ++i) { 7223 const CXXDestructorDecl *Dtor = 7224 DelayedDestructorExceptionSpecChecks[i].first; 7225 assert(!Dtor->getParent()->isDependentType() && 7226 "Should not ever add destructors of templates into the list."); 7227 CheckOverridingFunctionExceptionSpec(Dtor, 7228 DelayedDestructorExceptionSpecChecks[i].second); 7229 } 7230 DelayedDestructorExceptionSpecChecks.clear(); 7231} 7232 7233void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7234 CXXDestructorDecl *Destructor) { 7235 assert(getLangOpts().CPlusPlus0x && 7236 "adjusting dtor exception specs was introduced in c++11"); 7237 7238 // C++11 [class.dtor]p3: 7239 // A declaration of a destructor that does not have an exception- 7240 // specification is implicitly considered to have the same exception- 7241 // specification as an implicit declaration. 7242 const FunctionProtoType *DtorType = Destructor->getType()-> 7243 getAs<FunctionProtoType>(); 7244 if (DtorType->hasExceptionSpec()) 7245 return; 7246 7247 // Replace the destructor's type, building off the existing one. Fortunately, 7248 // the only thing of interest in the destructor type is its extended info. 7249 // The return and arguments are fixed. 7250 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7251 EPI.ExceptionSpecType = EST_Unevaluated; 7252 EPI.ExceptionSpecDecl = Destructor; 7253 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7254 7255 // FIXME: If the destructor has a body that could throw, and the newly created 7256 // spec doesn't allow exceptions, we should emit a warning, because this 7257 // change in behavior can break conforming C++03 programs at runtime. 7258 // However, we don't have a body or an exception specification yet, so it 7259 // needs to be done somewhere else. 7260} 7261 7262/// \brief Builds a statement that copies/moves the given entity from \p From to 7263/// \c To. 7264/// 7265/// This routine is used to copy/move the members of a class with an 7266/// implicitly-declared copy/move assignment operator. When the entities being 7267/// copied are arrays, this routine builds for loops to copy them. 7268/// 7269/// \param S The Sema object used for type-checking. 7270/// 7271/// \param Loc The location where the implicit copy/move is being generated. 7272/// 7273/// \param T The type of the expressions being copied/moved. Both expressions 7274/// must have this type. 7275/// 7276/// \param To The expression we are copying/moving to. 7277/// 7278/// \param From The expression we are copying/moving from. 7279/// 7280/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7281/// Otherwise, it's a non-static member subobject. 7282/// 7283/// \param Copying Whether we're copying or moving. 7284/// 7285/// \param Depth Internal parameter recording the depth of the recursion. 7286/// 7287/// \returns A statement or a loop that copies the expressions. 7288static StmtResult 7289BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7290 Expr *To, Expr *From, 7291 bool CopyingBaseSubobject, bool Copying, 7292 unsigned Depth = 0) { 7293 // C++0x [class.copy]p28: 7294 // Each subobject is assigned in the manner appropriate to its type: 7295 // 7296 // - if the subobject is of class type, as if by a call to operator= with 7297 // the subobject as the object expression and the corresponding 7298 // subobject of x as a single function argument (as if by explicit 7299 // qualification; that is, ignoring any possible virtual overriding 7300 // functions in more derived classes); 7301 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7302 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7303 7304 // Look for operator=. 7305 DeclarationName Name 7306 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7307 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7308 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7309 7310 // Filter out any result that isn't a copy/move-assignment operator. 7311 LookupResult::Filter F = OpLookup.makeFilter(); 7312 while (F.hasNext()) { 7313 NamedDecl *D = F.next(); 7314 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7315 if (Method->isCopyAssignmentOperator() || 7316 (!Copying && Method->isMoveAssignmentOperator())) 7317 continue; 7318 7319 F.erase(); 7320 } 7321 F.done(); 7322 7323 // Suppress the protected check (C++ [class.protected]) for each of the 7324 // assignment operators we found. This strange dance is required when 7325 // we're assigning via a base classes's copy-assignment operator. To 7326 // ensure that we're getting the right base class subobject (without 7327 // ambiguities), we need to cast "this" to that subobject type; to 7328 // ensure that we don't go through the virtual call mechanism, we need 7329 // to qualify the operator= name with the base class (see below). However, 7330 // this means that if the base class has a protected copy assignment 7331 // operator, the protected member access check will fail. So, we 7332 // rewrite "protected" access to "public" access in this case, since we 7333 // know by construction that we're calling from a derived class. 7334 if (CopyingBaseSubobject) { 7335 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7336 L != LEnd; ++L) { 7337 if (L.getAccess() == AS_protected) 7338 L.setAccess(AS_public); 7339 } 7340 } 7341 7342 // Create the nested-name-specifier that will be used to qualify the 7343 // reference to operator=; this is required to suppress the virtual 7344 // call mechanism. 7345 CXXScopeSpec SS; 7346 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7347 SS.MakeTrivial(S.Context, 7348 NestedNameSpecifier::Create(S.Context, 0, false, 7349 CanonicalT), 7350 Loc); 7351 7352 // Create the reference to operator=. 7353 ExprResult OpEqualRef 7354 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7355 /*TemplateKWLoc=*/SourceLocation(), 7356 /*FirstQualifierInScope=*/0, 7357 OpLookup, 7358 /*TemplateArgs=*/0, 7359 /*SuppressQualifierCheck=*/true); 7360 if (OpEqualRef.isInvalid()) 7361 return StmtError(); 7362 7363 // Build the call to the assignment operator. 7364 7365 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7366 OpEqualRef.takeAs<Expr>(), 7367 Loc, &From, 1, Loc); 7368 if (Call.isInvalid()) 7369 return StmtError(); 7370 7371 return S.Owned(Call.takeAs<Stmt>()); 7372 } 7373 7374 // - if the subobject is of scalar type, the built-in assignment 7375 // operator is used. 7376 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7377 if (!ArrayTy) { 7378 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7379 if (Assignment.isInvalid()) 7380 return StmtError(); 7381 7382 return S.Owned(Assignment.takeAs<Stmt>()); 7383 } 7384 7385 // - if the subobject is an array, each element is assigned, in the 7386 // manner appropriate to the element type; 7387 7388 // Construct a loop over the array bounds, e.g., 7389 // 7390 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7391 // 7392 // that will copy each of the array elements. 7393 QualType SizeType = S.Context.getSizeType(); 7394 7395 // Create the iteration variable. 7396 IdentifierInfo *IterationVarName = 0; 7397 { 7398 SmallString<8> Str; 7399 llvm::raw_svector_ostream OS(Str); 7400 OS << "__i" << Depth; 7401 IterationVarName = &S.Context.Idents.get(OS.str()); 7402 } 7403 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7404 IterationVarName, SizeType, 7405 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7406 SC_None, SC_None); 7407 7408 // Initialize the iteration variable to zero. 7409 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7410 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7411 7412 // Create a reference to the iteration variable; we'll use this several 7413 // times throughout. 7414 Expr *IterationVarRef 7415 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7416 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7417 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7418 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7419 7420 // Create the DeclStmt that holds the iteration variable. 7421 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7422 7423 // Create the comparison against the array bound. 7424 llvm::APInt Upper 7425 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7426 Expr *Comparison 7427 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7428 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7429 BO_NE, S.Context.BoolTy, 7430 VK_RValue, OK_Ordinary, Loc); 7431 7432 // Create the pre-increment of the iteration variable. 7433 Expr *Increment 7434 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7435 VK_LValue, OK_Ordinary, Loc); 7436 7437 // Subscript the "from" and "to" expressions with the iteration variable. 7438 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7439 IterationVarRefRVal, 7440 Loc)); 7441 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7442 IterationVarRefRVal, 7443 Loc)); 7444 if (!Copying) // Cast to rvalue 7445 From = CastForMoving(S, From); 7446 7447 // Build the copy/move for an individual element of the array. 7448 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7449 To, From, CopyingBaseSubobject, 7450 Copying, Depth + 1); 7451 if (Copy.isInvalid()) 7452 return StmtError(); 7453 7454 // Construct the loop that copies all elements of this array. 7455 return S.ActOnForStmt(Loc, Loc, InitStmt, 7456 S.MakeFullExpr(Comparison), 7457 0, S.MakeFullExpr(Increment), 7458 Loc, Copy.take()); 7459} 7460 7461/// Determine whether an implicit copy assignment operator for ClassDecl has a 7462/// const argument. 7463/// FIXME: It ought to be possible to store this on the record. 7464static bool isImplicitCopyAssignmentArgConst(Sema &S, 7465 CXXRecordDecl *ClassDecl) { 7466 if (ClassDecl->isInvalidDecl()) 7467 return true; 7468 7469 // C++ [class.copy]p10: 7470 // If the class definition does not explicitly declare a copy 7471 // assignment operator, one is declared implicitly. 7472 // The implicitly-defined copy assignment operator for a class X 7473 // will have the form 7474 // 7475 // X& X::operator=(const X&) 7476 // 7477 // if 7478 // -- each direct base class B of X has a copy assignment operator 7479 // whose parameter is of type const B&, const volatile B& or B, 7480 // and 7481 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7482 BaseEnd = ClassDecl->bases_end(); 7483 Base != BaseEnd; ++Base) { 7484 // We'll handle this below 7485 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7486 continue; 7487 7488 assert(!Base->getType()->isDependentType() && 7489 "Cannot generate implicit members for class with dependent bases."); 7490 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7491 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7492 return false; 7493 } 7494 7495 // In C++11, the above citation has "or virtual" added 7496 if (S.getLangOpts().CPlusPlus0x) { 7497 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7498 BaseEnd = ClassDecl->vbases_end(); 7499 Base != BaseEnd; ++Base) { 7500 assert(!Base->getType()->isDependentType() && 7501 "Cannot generate implicit members for class with dependent bases."); 7502 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7503 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7504 false, 0)) 7505 return false; 7506 } 7507 } 7508 7509 // -- for all the nonstatic data members of X that are of a class 7510 // type M (or array thereof), each such class type has a copy 7511 // assignment operator whose parameter is of type const M&, 7512 // const volatile M& or M. 7513 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7514 FieldEnd = ClassDecl->field_end(); 7515 Field != FieldEnd; ++Field) { 7516 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7517 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7518 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7519 false, 0)) 7520 return false; 7521 } 7522 7523 // Otherwise, the implicitly declared copy assignment operator will 7524 // have the form 7525 // 7526 // X& X::operator=(X&) 7527 7528 return true; 7529} 7530 7531Sema::ImplicitExceptionSpecification 7532Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7533 CXXRecordDecl *ClassDecl = MD->getParent(); 7534 7535 ImplicitExceptionSpecification ExceptSpec(*this); 7536 if (ClassDecl->isInvalidDecl()) 7537 return ExceptSpec; 7538 7539 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7540 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7541 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7542 7543 // C++ [except.spec]p14: 7544 // An implicitly declared special member function (Clause 12) shall have an 7545 // exception-specification. [...] 7546 7547 // It is unspecified whether or not an implicit copy assignment operator 7548 // attempts to deduplicate calls to assignment operators of virtual bases are 7549 // made. As such, this exception specification is effectively unspecified. 7550 // Based on a similar decision made for constness in C++0x, we're erring on 7551 // the side of assuming such calls to be made regardless of whether they 7552 // actually happen. 7553 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7554 BaseEnd = ClassDecl->bases_end(); 7555 Base != BaseEnd; ++Base) { 7556 if (Base->isVirtual()) 7557 continue; 7558 7559 CXXRecordDecl *BaseClassDecl 7560 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7561 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7562 ArgQuals, false, 0)) 7563 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7564 } 7565 7566 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7567 BaseEnd = ClassDecl->vbases_end(); 7568 Base != BaseEnd; ++Base) { 7569 CXXRecordDecl *BaseClassDecl 7570 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7571 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7572 ArgQuals, false, 0)) 7573 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7574 } 7575 7576 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7577 FieldEnd = ClassDecl->field_end(); 7578 Field != FieldEnd; 7579 ++Field) { 7580 QualType FieldType = Context.getBaseElementType(Field->getType()); 7581 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7582 if (CXXMethodDecl *CopyAssign = 7583 LookupCopyingAssignment(FieldClassDecl, 7584 ArgQuals | FieldType.getCVRQualifiers(), 7585 false, 0)) 7586 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7587 } 7588 } 7589 7590 return ExceptSpec; 7591} 7592 7593CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7594 // Note: The following rules are largely analoguous to the copy 7595 // constructor rules. Note that virtual bases are not taken into account 7596 // for determining the argument type of the operator. Note also that 7597 // operators taking an object instead of a reference are allowed. 7598 7599 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7600 QualType RetType = Context.getLValueReferenceType(ArgType); 7601 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7602 ArgType = ArgType.withConst(); 7603 ArgType = Context.getLValueReferenceType(ArgType); 7604 7605 // An implicitly-declared copy assignment operator is an inline public 7606 // member of its class. 7607 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7608 SourceLocation ClassLoc = ClassDecl->getLocation(); 7609 DeclarationNameInfo NameInfo(Name, ClassLoc); 7610 CXXMethodDecl *CopyAssignment 7611 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7612 /*TInfo=*/0, /*isStatic=*/false, 7613 /*StorageClassAsWritten=*/SC_None, 7614 /*isInline=*/true, /*isConstexpr=*/false, 7615 SourceLocation()); 7616 CopyAssignment->setAccess(AS_public); 7617 CopyAssignment->setDefaulted(); 7618 CopyAssignment->setImplicit(); 7619 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7620 7621 // Build an exception specification pointing back at this member. 7622 FunctionProtoType::ExtProtoInfo EPI; 7623 EPI.ExceptionSpecType = EST_Unevaluated; 7624 EPI.ExceptionSpecDecl = CopyAssignment; 7625 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7626 7627 // Add the parameter to the operator. 7628 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7629 ClassLoc, ClassLoc, /*Id=*/0, 7630 ArgType, /*TInfo=*/0, 7631 SC_None, 7632 SC_None, 0); 7633 CopyAssignment->setParams(FromParam); 7634 7635 // Note that we have added this copy-assignment operator. 7636 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7637 7638 if (Scope *S = getScopeForContext(ClassDecl)) 7639 PushOnScopeChains(CopyAssignment, S, false); 7640 ClassDecl->addDecl(CopyAssignment); 7641 7642 // C++0x [class.copy]p19: 7643 // .... If the class definition does not explicitly declare a copy 7644 // assignment operator, there is no user-declared move constructor, and 7645 // there is no user-declared move assignment operator, a copy assignment 7646 // operator is implicitly declared as defaulted. 7647 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7648 CopyAssignment->setDeletedAsWritten(); 7649 7650 AddOverriddenMethods(ClassDecl, CopyAssignment); 7651 return CopyAssignment; 7652} 7653 7654void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7655 CXXMethodDecl *CopyAssignOperator) { 7656 assert((CopyAssignOperator->isDefaulted() && 7657 CopyAssignOperator->isOverloadedOperator() && 7658 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7659 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7660 !CopyAssignOperator->isDeleted()) && 7661 "DefineImplicitCopyAssignment called for wrong function"); 7662 7663 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7664 7665 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7666 CopyAssignOperator->setInvalidDecl(); 7667 return; 7668 } 7669 7670 CopyAssignOperator->setUsed(); 7671 7672 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7673 DiagnosticErrorTrap Trap(Diags); 7674 7675 // C++0x [class.copy]p30: 7676 // The implicitly-defined or explicitly-defaulted copy assignment operator 7677 // for a non-union class X performs memberwise copy assignment of its 7678 // subobjects. The direct base classes of X are assigned first, in the 7679 // order of their declaration in the base-specifier-list, and then the 7680 // immediate non-static data members of X are assigned, in the order in 7681 // which they were declared in the class definition. 7682 7683 // The statements that form the synthesized function body. 7684 SmallVector<Stmt*, 8> Statements; 7685 7686 // The parameter for the "other" object, which we are copying from. 7687 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7688 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7689 QualType OtherRefType = Other->getType(); 7690 if (const LValueReferenceType *OtherRef 7691 = OtherRefType->getAs<LValueReferenceType>()) { 7692 OtherRefType = OtherRef->getPointeeType(); 7693 OtherQuals = OtherRefType.getQualifiers(); 7694 } 7695 7696 // Our location for everything implicitly-generated. 7697 SourceLocation Loc = CopyAssignOperator->getLocation(); 7698 7699 // Construct a reference to the "other" object. We'll be using this 7700 // throughout the generated ASTs. 7701 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7702 assert(OtherRef && "Reference to parameter cannot fail!"); 7703 7704 // Construct the "this" pointer. We'll be using this throughout the generated 7705 // ASTs. 7706 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7707 assert(This && "Reference to this cannot fail!"); 7708 7709 // Assign base classes. 7710 bool Invalid = false; 7711 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7712 E = ClassDecl->bases_end(); Base != E; ++Base) { 7713 // Form the assignment: 7714 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7715 QualType BaseType = Base->getType().getUnqualifiedType(); 7716 if (!BaseType->isRecordType()) { 7717 Invalid = true; 7718 continue; 7719 } 7720 7721 CXXCastPath BasePath; 7722 BasePath.push_back(Base); 7723 7724 // Construct the "from" expression, which is an implicit cast to the 7725 // appropriately-qualified base type. 7726 Expr *From = OtherRef; 7727 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7728 CK_UncheckedDerivedToBase, 7729 VK_LValue, &BasePath).take(); 7730 7731 // Dereference "this". 7732 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7733 7734 // Implicitly cast "this" to the appropriately-qualified base type. 7735 To = ImpCastExprToType(To.take(), 7736 Context.getCVRQualifiedType(BaseType, 7737 CopyAssignOperator->getTypeQualifiers()), 7738 CK_UncheckedDerivedToBase, 7739 VK_LValue, &BasePath); 7740 7741 // Build the copy. 7742 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7743 To.get(), From, 7744 /*CopyingBaseSubobject=*/true, 7745 /*Copying=*/true); 7746 if (Copy.isInvalid()) { 7747 Diag(CurrentLocation, diag::note_member_synthesized_at) 7748 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7749 CopyAssignOperator->setInvalidDecl(); 7750 return; 7751 } 7752 7753 // Success! Record the copy. 7754 Statements.push_back(Copy.takeAs<Expr>()); 7755 } 7756 7757 // \brief Reference to the __builtin_memcpy function. 7758 Expr *BuiltinMemCpyRef = 0; 7759 // \brief Reference to the __builtin_objc_memmove_collectable function. 7760 Expr *CollectableMemCpyRef = 0; 7761 7762 // Assign non-static members. 7763 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7764 FieldEnd = ClassDecl->field_end(); 7765 Field != FieldEnd; ++Field) { 7766 if (Field->isUnnamedBitfield()) 7767 continue; 7768 7769 // Check for members of reference type; we can't copy those. 7770 if (Field->getType()->isReferenceType()) { 7771 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7772 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7773 Diag(Field->getLocation(), diag::note_declared_at); 7774 Diag(CurrentLocation, diag::note_member_synthesized_at) 7775 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7776 Invalid = true; 7777 continue; 7778 } 7779 7780 // Check for members of const-qualified, non-class type. 7781 QualType BaseType = Context.getBaseElementType(Field->getType()); 7782 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7783 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7784 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7785 Diag(Field->getLocation(), diag::note_declared_at); 7786 Diag(CurrentLocation, diag::note_member_synthesized_at) 7787 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7788 Invalid = true; 7789 continue; 7790 } 7791 7792 // Suppress assigning zero-width bitfields. 7793 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7794 continue; 7795 7796 QualType FieldType = Field->getType().getNonReferenceType(); 7797 if (FieldType->isIncompleteArrayType()) { 7798 assert(ClassDecl->hasFlexibleArrayMember() && 7799 "Incomplete array type is not valid"); 7800 continue; 7801 } 7802 7803 // Build references to the field in the object we're copying from and to. 7804 CXXScopeSpec SS; // Intentionally empty 7805 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7806 LookupMemberName); 7807 MemberLookup.addDecl(*Field); 7808 MemberLookup.resolveKind(); 7809 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7810 Loc, /*IsArrow=*/false, 7811 SS, SourceLocation(), 0, 7812 MemberLookup, 0); 7813 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7814 Loc, /*IsArrow=*/true, 7815 SS, SourceLocation(), 0, 7816 MemberLookup, 0); 7817 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7818 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7819 7820 // If the field should be copied with __builtin_memcpy rather than via 7821 // explicit assignments, do so. This optimization only applies for arrays 7822 // of scalars and arrays of class type with trivial copy-assignment 7823 // operators. 7824 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7825 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7826 // Compute the size of the memory buffer to be copied. 7827 QualType SizeType = Context.getSizeType(); 7828 llvm::APInt Size(Context.getTypeSize(SizeType), 7829 Context.getTypeSizeInChars(BaseType).getQuantity()); 7830 for (const ConstantArrayType *Array 7831 = Context.getAsConstantArrayType(FieldType); 7832 Array; 7833 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7834 llvm::APInt ArraySize 7835 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7836 Size *= ArraySize; 7837 } 7838 7839 // Take the address of the field references for "from" and "to". 7840 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7841 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7842 7843 bool NeedsCollectableMemCpy = 7844 (BaseType->isRecordType() && 7845 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7846 7847 if (NeedsCollectableMemCpy) { 7848 if (!CollectableMemCpyRef) { 7849 // Create a reference to the __builtin_objc_memmove_collectable function. 7850 LookupResult R(*this, 7851 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7852 Loc, LookupOrdinaryName); 7853 LookupName(R, TUScope, true); 7854 7855 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7856 if (!CollectableMemCpy) { 7857 // Something went horribly wrong earlier, and we will have 7858 // complained about it. 7859 Invalid = true; 7860 continue; 7861 } 7862 7863 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7864 Context.BuiltinFnTy, 7865 VK_RValue, Loc, 0).take(); 7866 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7867 } 7868 } 7869 // Create a reference to the __builtin_memcpy builtin function. 7870 else if (!BuiltinMemCpyRef) { 7871 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7872 LookupOrdinaryName); 7873 LookupName(R, TUScope, true); 7874 7875 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7876 if (!BuiltinMemCpy) { 7877 // Something went horribly wrong earlier, and we will have complained 7878 // about it. 7879 Invalid = true; 7880 continue; 7881 } 7882 7883 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7884 Context.BuiltinFnTy, 7885 VK_RValue, Loc, 0).take(); 7886 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7887 } 7888 7889 SmallVector<Expr*, 8> CallArgs; 7890 CallArgs.push_back(To.takeAs<Expr>()); 7891 CallArgs.push_back(From.takeAs<Expr>()); 7892 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7893 ExprResult Call = ExprError(); 7894 if (NeedsCollectableMemCpy) 7895 Call = ActOnCallExpr(/*Scope=*/0, 7896 CollectableMemCpyRef, 7897 Loc, CallArgs, 7898 Loc); 7899 else 7900 Call = ActOnCallExpr(/*Scope=*/0, 7901 BuiltinMemCpyRef, 7902 Loc, CallArgs, 7903 Loc); 7904 7905 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7906 Statements.push_back(Call.takeAs<Expr>()); 7907 continue; 7908 } 7909 7910 // Build the copy of this field. 7911 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7912 To.get(), From.get(), 7913 /*CopyingBaseSubobject=*/false, 7914 /*Copying=*/true); 7915 if (Copy.isInvalid()) { 7916 Diag(CurrentLocation, diag::note_member_synthesized_at) 7917 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7918 CopyAssignOperator->setInvalidDecl(); 7919 return; 7920 } 7921 7922 // Success! Record the copy. 7923 Statements.push_back(Copy.takeAs<Stmt>()); 7924 } 7925 7926 if (!Invalid) { 7927 // Add a "return *this;" 7928 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7929 7930 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7931 if (Return.isInvalid()) 7932 Invalid = true; 7933 else { 7934 Statements.push_back(Return.takeAs<Stmt>()); 7935 7936 if (Trap.hasErrorOccurred()) { 7937 Diag(CurrentLocation, diag::note_member_synthesized_at) 7938 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7939 Invalid = true; 7940 } 7941 } 7942 } 7943 7944 if (Invalid) { 7945 CopyAssignOperator->setInvalidDecl(); 7946 return; 7947 } 7948 7949 StmtResult Body; 7950 { 7951 CompoundScopeRAII CompoundScope(*this); 7952 Body = ActOnCompoundStmt(Loc, Loc, Statements, 7953 /*isStmtExpr=*/false); 7954 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7955 } 7956 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7957 7958 if (ASTMutationListener *L = getASTMutationListener()) { 7959 L->CompletedImplicitDefinition(CopyAssignOperator); 7960 } 7961} 7962 7963Sema::ImplicitExceptionSpecification 7964Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7965 CXXRecordDecl *ClassDecl = MD->getParent(); 7966 7967 ImplicitExceptionSpecification ExceptSpec(*this); 7968 if (ClassDecl->isInvalidDecl()) 7969 return ExceptSpec; 7970 7971 // C++0x [except.spec]p14: 7972 // An implicitly declared special member function (Clause 12) shall have an 7973 // exception-specification. [...] 7974 7975 // It is unspecified whether or not an implicit move assignment operator 7976 // attempts to deduplicate calls to assignment operators of virtual bases are 7977 // made. As such, this exception specification is effectively unspecified. 7978 // Based on a similar decision made for constness in C++0x, we're erring on 7979 // the side of assuming such calls to be made regardless of whether they 7980 // actually happen. 7981 // Note that a move constructor is not implicitly declared when there are 7982 // virtual bases, but it can still be user-declared and explicitly defaulted. 7983 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7984 BaseEnd = ClassDecl->bases_end(); 7985 Base != BaseEnd; ++Base) { 7986 if (Base->isVirtual()) 7987 continue; 7988 7989 CXXRecordDecl *BaseClassDecl 7990 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7991 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7992 0, false, 0)) 7993 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7994 } 7995 7996 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7997 BaseEnd = ClassDecl->vbases_end(); 7998 Base != BaseEnd; ++Base) { 7999 CXXRecordDecl *BaseClassDecl 8000 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8001 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8002 0, false, 0)) 8003 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8004 } 8005 8006 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8007 FieldEnd = ClassDecl->field_end(); 8008 Field != FieldEnd; 8009 ++Field) { 8010 QualType FieldType = Context.getBaseElementType(Field->getType()); 8011 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8012 if (CXXMethodDecl *MoveAssign = 8013 LookupMovingAssignment(FieldClassDecl, 8014 FieldType.getCVRQualifiers(), 8015 false, 0)) 8016 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8017 } 8018 } 8019 8020 return ExceptSpec; 8021} 8022 8023/// Determine whether the class type has any direct or indirect virtual base 8024/// classes which have a non-trivial move assignment operator. 8025static bool 8026hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8027 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8028 BaseEnd = ClassDecl->vbases_end(); 8029 Base != BaseEnd; ++Base) { 8030 CXXRecordDecl *BaseClass = 8031 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8032 8033 // Try to declare the move assignment. If it would be deleted, then the 8034 // class does not have a non-trivial move assignment. 8035 if (BaseClass->needsImplicitMoveAssignment()) 8036 S.DeclareImplicitMoveAssignment(BaseClass); 8037 8038 // If the class has both a trivial move assignment and a non-trivial move 8039 // assignment, hasTrivialMoveAssignment() is false. 8040 if (BaseClass->hasDeclaredMoveAssignment() && 8041 !BaseClass->hasTrivialMoveAssignment()) 8042 return true; 8043 } 8044 8045 return false; 8046} 8047 8048/// Determine whether the given type either has a move constructor or is 8049/// trivially copyable. 8050static bool 8051hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8052 Type = S.Context.getBaseElementType(Type); 8053 8054 // FIXME: Technically, non-trivially-copyable non-class types, such as 8055 // reference types, are supposed to return false here, but that appears 8056 // to be a standard defect. 8057 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8058 if (!ClassDecl || !ClassDecl->getDefinition()) 8059 return true; 8060 8061 if (Type.isTriviallyCopyableType(S.Context)) 8062 return true; 8063 8064 if (IsConstructor) { 8065 if (ClassDecl->needsImplicitMoveConstructor()) 8066 S.DeclareImplicitMoveConstructor(ClassDecl); 8067 return ClassDecl->hasDeclaredMoveConstructor(); 8068 } 8069 8070 if (ClassDecl->needsImplicitMoveAssignment()) 8071 S.DeclareImplicitMoveAssignment(ClassDecl); 8072 return ClassDecl->hasDeclaredMoveAssignment(); 8073} 8074 8075/// Determine whether all non-static data members and direct or virtual bases 8076/// of class \p ClassDecl have either a move operation, or are trivially 8077/// copyable. 8078static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8079 bool IsConstructor) { 8080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8081 BaseEnd = ClassDecl->bases_end(); 8082 Base != BaseEnd; ++Base) { 8083 if (Base->isVirtual()) 8084 continue; 8085 8086 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8087 return false; 8088 } 8089 8090 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8091 BaseEnd = ClassDecl->vbases_end(); 8092 Base != BaseEnd; ++Base) { 8093 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8094 return false; 8095 } 8096 8097 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8098 FieldEnd = ClassDecl->field_end(); 8099 Field != FieldEnd; ++Field) { 8100 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8101 return false; 8102 } 8103 8104 return true; 8105} 8106 8107CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8108 // C++11 [class.copy]p20: 8109 // If the definition of a class X does not explicitly declare a move 8110 // assignment operator, one will be implicitly declared as defaulted 8111 // if and only if: 8112 // 8113 // - [first 4 bullets] 8114 assert(ClassDecl->needsImplicitMoveAssignment()); 8115 8116 // [Checked after we build the declaration] 8117 // - the move assignment operator would not be implicitly defined as 8118 // deleted, 8119 8120 // [DR1402]: 8121 // - X has no direct or indirect virtual base class with a non-trivial 8122 // move assignment operator, and 8123 // - each of X's non-static data members and direct or virtual base classes 8124 // has a type that either has a move assignment operator or is trivially 8125 // copyable. 8126 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8127 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8128 ClassDecl->setFailedImplicitMoveAssignment(); 8129 return 0; 8130 } 8131 8132 // Note: The following rules are largely analoguous to the move 8133 // constructor rules. 8134 8135 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8136 QualType RetType = Context.getLValueReferenceType(ArgType); 8137 ArgType = Context.getRValueReferenceType(ArgType); 8138 8139 // An implicitly-declared move assignment operator is an inline public 8140 // member of its class. 8141 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8142 SourceLocation ClassLoc = ClassDecl->getLocation(); 8143 DeclarationNameInfo NameInfo(Name, ClassLoc); 8144 CXXMethodDecl *MoveAssignment 8145 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8146 /*TInfo=*/0, /*isStatic=*/false, 8147 /*StorageClassAsWritten=*/SC_None, 8148 /*isInline=*/true, 8149 /*isConstexpr=*/false, 8150 SourceLocation()); 8151 MoveAssignment->setAccess(AS_public); 8152 MoveAssignment->setDefaulted(); 8153 MoveAssignment->setImplicit(); 8154 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8155 8156 // Build an exception specification pointing back at this member. 8157 FunctionProtoType::ExtProtoInfo EPI; 8158 EPI.ExceptionSpecType = EST_Unevaluated; 8159 EPI.ExceptionSpecDecl = MoveAssignment; 8160 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8161 8162 // Add the parameter to the operator. 8163 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8164 ClassLoc, ClassLoc, /*Id=*/0, 8165 ArgType, /*TInfo=*/0, 8166 SC_None, 8167 SC_None, 0); 8168 MoveAssignment->setParams(FromParam); 8169 8170 // Note that we have added this copy-assignment operator. 8171 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8172 8173 // C++0x [class.copy]p9: 8174 // If the definition of a class X does not explicitly declare a move 8175 // assignment operator, one will be implicitly declared as defaulted if and 8176 // only if: 8177 // [...] 8178 // - the move assignment operator would not be implicitly defined as 8179 // deleted. 8180 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8181 // Cache this result so that we don't try to generate this over and over 8182 // on every lookup, leaking memory and wasting time. 8183 ClassDecl->setFailedImplicitMoveAssignment(); 8184 return 0; 8185 } 8186 8187 if (Scope *S = getScopeForContext(ClassDecl)) 8188 PushOnScopeChains(MoveAssignment, S, false); 8189 ClassDecl->addDecl(MoveAssignment); 8190 8191 AddOverriddenMethods(ClassDecl, MoveAssignment); 8192 return MoveAssignment; 8193} 8194 8195void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8196 CXXMethodDecl *MoveAssignOperator) { 8197 assert((MoveAssignOperator->isDefaulted() && 8198 MoveAssignOperator->isOverloadedOperator() && 8199 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8200 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8201 !MoveAssignOperator->isDeleted()) && 8202 "DefineImplicitMoveAssignment called for wrong function"); 8203 8204 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8205 8206 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8207 MoveAssignOperator->setInvalidDecl(); 8208 return; 8209 } 8210 8211 MoveAssignOperator->setUsed(); 8212 8213 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8214 DiagnosticErrorTrap Trap(Diags); 8215 8216 // C++0x [class.copy]p28: 8217 // The implicitly-defined or move assignment operator for a non-union class 8218 // X performs memberwise move assignment of its subobjects. The direct base 8219 // classes of X are assigned first, in the order of their declaration in the 8220 // base-specifier-list, and then the immediate non-static data members of X 8221 // are assigned, in the order in which they were declared in the class 8222 // definition. 8223 8224 // The statements that form the synthesized function body. 8225 SmallVector<Stmt*, 8> Statements; 8226 8227 // The parameter for the "other" object, which we are move from. 8228 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8229 QualType OtherRefType = Other->getType()-> 8230 getAs<RValueReferenceType>()->getPointeeType(); 8231 assert(OtherRefType.getQualifiers() == 0 && 8232 "Bad argument type of defaulted move assignment"); 8233 8234 // Our location for everything implicitly-generated. 8235 SourceLocation Loc = MoveAssignOperator->getLocation(); 8236 8237 // Construct a reference to the "other" object. We'll be using this 8238 // throughout the generated ASTs. 8239 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8240 assert(OtherRef && "Reference to parameter cannot fail!"); 8241 // Cast to rvalue. 8242 OtherRef = CastForMoving(*this, OtherRef); 8243 8244 // Construct the "this" pointer. We'll be using this throughout the generated 8245 // ASTs. 8246 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8247 assert(This && "Reference to this cannot fail!"); 8248 8249 // Assign base classes. 8250 bool Invalid = false; 8251 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8252 E = ClassDecl->bases_end(); Base != E; ++Base) { 8253 // Form the assignment: 8254 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8255 QualType BaseType = Base->getType().getUnqualifiedType(); 8256 if (!BaseType->isRecordType()) { 8257 Invalid = true; 8258 continue; 8259 } 8260 8261 CXXCastPath BasePath; 8262 BasePath.push_back(Base); 8263 8264 // Construct the "from" expression, which is an implicit cast to the 8265 // appropriately-qualified base type. 8266 Expr *From = OtherRef; 8267 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8268 VK_XValue, &BasePath).take(); 8269 8270 // Dereference "this". 8271 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8272 8273 // Implicitly cast "this" to the appropriately-qualified base type. 8274 To = ImpCastExprToType(To.take(), 8275 Context.getCVRQualifiedType(BaseType, 8276 MoveAssignOperator->getTypeQualifiers()), 8277 CK_UncheckedDerivedToBase, 8278 VK_LValue, &BasePath); 8279 8280 // Build the move. 8281 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8282 To.get(), From, 8283 /*CopyingBaseSubobject=*/true, 8284 /*Copying=*/false); 8285 if (Move.isInvalid()) { 8286 Diag(CurrentLocation, diag::note_member_synthesized_at) 8287 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8288 MoveAssignOperator->setInvalidDecl(); 8289 return; 8290 } 8291 8292 // Success! Record the move. 8293 Statements.push_back(Move.takeAs<Expr>()); 8294 } 8295 8296 // \brief Reference to the __builtin_memcpy function. 8297 Expr *BuiltinMemCpyRef = 0; 8298 // \brief Reference to the __builtin_objc_memmove_collectable function. 8299 Expr *CollectableMemCpyRef = 0; 8300 8301 // Assign non-static members. 8302 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8303 FieldEnd = ClassDecl->field_end(); 8304 Field != FieldEnd; ++Field) { 8305 if (Field->isUnnamedBitfield()) 8306 continue; 8307 8308 // Check for members of reference type; we can't move those. 8309 if (Field->getType()->isReferenceType()) { 8310 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8311 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8312 Diag(Field->getLocation(), diag::note_declared_at); 8313 Diag(CurrentLocation, diag::note_member_synthesized_at) 8314 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8315 Invalid = true; 8316 continue; 8317 } 8318 8319 // Check for members of const-qualified, non-class type. 8320 QualType BaseType = Context.getBaseElementType(Field->getType()); 8321 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8322 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8323 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8324 Diag(Field->getLocation(), diag::note_declared_at); 8325 Diag(CurrentLocation, diag::note_member_synthesized_at) 8326 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8327 Invalid = true; 8328 continue; 8329 } 8330 8331 // Suppress assigning zero-width bitfields. 8332 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8333 continue; 8334 8335 QualType FieldType = Field->getType().getNonReferenceType(); 8336 if (FieldType->isIncompleteArrayType()) { 8337 assert(ClassDecl->hasFlexibleArrayMember() && 8338 "Incomplete array type is not valid"); 8339 continue; 8340 } 8341 8342 // Build references to the field in the object we're copying from and to. 8343 CXXScopeSpec SS; // Intentionally empty 8344 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8345 LookupMemberName); 8346 MemberLookup.addDecl(*Field); 8347 MemberLookup.resolveKind(); 8348 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8349 Loc, /*IsArrow=*/false, 8350 SS, SourceLocation(), 0, 8351 MemberLookup, 0); 8352 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8353 Loc, /*IsArrow=*/true, 8354 SS, SourceLocation(), 0, 8355 MemberLookup, 0); 8356 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8357 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8358 8359 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8360 "Member reference with rvalue base must be rvalue except for reference " 8361 "members, which aren't allowed for move assignment."); 8362 8363 // If the field should be copied with __builtin_memcpy rather than via 8364 // explicit assignments, do so. This optimization only applies for arrays 8365 // of scalars and arrays of class type with trivial move-assignment 8366 // operators. 8367 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8368 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8369 // Compute the size of the memory buffer to be copied. 8370 QualType SizeType = Context.getSizeType(); 8371 llvm::APInt Size(Context.getTypeSize(SizeType), 8372 Context.getTypeSizeInChars(BaseType).getQuantity()); 8373 for (const ConstantArrayType *Array 8374 = Context.getAsConstantArrayType(FieldType); 8375 Array; 8376 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8377 llvm::APInt ArraySize 8378 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8379 Size *= ArraySize; 8380 } 8381 8382 // Take the address of the field references for "from" and "to". We 8383 // directly construct UnaryOperators here because semantic analysis 8384 // does not permit us to take the address of an xvalue. 8385 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8386 Context.getPointerType(From.get()->getType()), 8387 VK_RValue, OK_Ordinary, Loc); 8388 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8389 Context.getPointerType(To.get()->getType()), 8390 VK_RValue, OK_Ordinary, Loc); 8391 8392 bool NeedsCollectableMemCpy = 8393 (BaseType->isRecordType() && 8394 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8395 8396 if (NeedsCollectableMemCpy) { 8397 if (!CollectableMemCpyRef) { 8398 // Create a reference to the __builtin_objc_memmove_collectable function. 8399 LookupResult R(*this, 8400 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8401 Loc, LookupOrdinaryName); 8402 LookupName(R, TUScope, true); 8403 8404 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8405 if (!CollectableMemCpy) { 8406 // Something went horribly wrong earlier, and we will have 8407 // complained about it. 8408 Invalid = true; 8409 continue; 8410 } 8411 8412 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8413 Context.BuiltinFnTy, 8414 VK_RValue, Loc, 0).take(); 8415 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8416 } 8417 } 8418 // Create a reference to the __builtin_memcpy builtin function. 8419 else if (!BuiltinMemCpyRef) { 8420 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8421 LookupOrdinaryName); 8422 LookupName(R, TUScope, true); 8423 8424 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8425 if (!BuiltinMemCpy) { 8426 // Something went horribly wrong earlier, and we will have complained 8427 // about it. 8428 Invalid = true; 8429 continue; 8430 } 8431 8432 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8433 Context.BuiltinFnTy, 8434 VK_RValue, Loc, 0).take(); 8435 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8436 } 8437 8438 SmallVector<Expr*, 8> CallArgs; 8439 CallArgs.push_back(To.takeAs<Expr>()); 8440 CallArgs.push_back(From.takeAs<Expr>()); 8441 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8442 ExprResult Call = ExprError(); 8443 if (NeedsCollectableMemCpy) 8444 Call = ActOnCallExpr(/*Scope=*/0, 8445 CollectableMemCpyRef, 8446 Loc, CallArgs, 8447 Loc); 8448 else 8449 Call = ActOnCallExpr(/*Scope=*/0, 8450 BuiltinMemCpyRef, 8451 Loc, CallArgs, 8452 Loc); 8453 8454 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8455 Statements.push_back(Call.takeAs<Expr>()); 8456 continue; 8457 } 8458 8459 // Build the move of this field. 8460 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8461 To.get(), From.get(), 8462 /*CopyingBaseSubobject=*/false, 8463 /*Copying=*/false); 8464 if (Move.isInvalid()) { 8465 Diag(CurrentLocation, diag::note_member_synthesized_at) 8466 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8467 MoveAssignOperator->setInvalidDecl(); 8468 return; 8469 } 8470 8471 // Success! Record the copy. 8472 Statements.push_back(Move.takeAs<Stmt>()); 8473 } 8474 8475 if (!Invalid) { 8476 // Add a "return *this;" 8477 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8478 8479 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8480 if (Return.isInvalid()) 8481 Invalid = true; 8482 else { 8483 Statements.push_back(Return.takeAs<Stmt>()); 8484 8485 if (Trap.hasErrorOccurred()) { 8486 Diag(CurrentLocation, diag::note_member_synthesized_at) 8487 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8488 Invalid = true; 8489 } 8490 } 8491 } 8492 8493 if (Invalid) { 8494 MoveAssignOperator->setInvalidDecl(); 8495 return; 8496 } 8497 8498 StmtResult Body; 8499 { 8500 CompoundScopeRAII CompoundScope(*this); 8501 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8502 /*isStmtExpr=*/false); 8503 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8504 } 8505 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8506 8507 if (ASTMutationListener *L = getASTMutationListener()) { 8508 L->CompletedImplicitDefinition(MoveAssignOperator); 8509 } 8510} 8511 8512/// Determine whether an implicit copy constructor for ClassDecl has a const 8513/// argument. 8514/// FIXME: It ought to be possible to store this on the record. 8515static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8516 if (ClassDecl->isInvalidDecl()) 8517 return true; 8518 8519 // C++ [class.copy]p5: 8520 // The implicitly-declared copy constructor for a class X will 8521 // have the form 8522 // 8523 // X::X(const X&) 8524 // 8525 // if 8526 // -- each direct or virtual base class B of X has a copy 8527 // constructor whose first parameter is of type const B& or 8528 // const volatile B&, and 8529 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8530 BaseEnd = ClassDecl->bases_end(); 8531 Base != BaseEnd; ++Base) { 8532 // Virtual bases are handled below. 8533 if (Base->isVirtual()) 8534 continue; 8535 8536 CXXRecordDecl *BaseClassDecl 8537 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8538 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8539 // ambiguous, we should still produce a constructor with a const-qualified 8540 // parameter. 8541 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8542 return false; 8543 } 8544 8545 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8546 BaseEnd = ClassDecl->vbases_end(); 8547 Base != BaseEnd; ++Base) { 8548 CXXRecordDecl *BaseClassDecl 8549 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8550 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8551 return false; 8552 } 8553 8554 // -- for all the nonstatic data members of X that are of a 8555 // class type M (or array thereof), each such class type 8556 // has a copy constructor whose first parameter is of type 8557 // const M& or const volatile M&. 8558 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8559 FieldEnd = ClassDecl->field_end(); 8560 Field != FieldEnd; ++Field) { 8561 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8562 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8563 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8564 return false; 8565 } 8566 } 8567 8568 // Otherwise, the implicitly declared copy constructor will have 8569 // the form 8570 // 8571 // X::X(X&) 8572 8573 return true; 8574} 8575 8576Sema::ImplicitExceptionSpecification 8577Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8578 CXXRecordDecl *ClassDecl = MD->getParent(); 8579 8580 ImplicitExceptionSpecification ExceptSpec(*this); 8581 if (ClassDecl->isInvalidDecl()) 8582 return ExceptSpec; 8583 8584 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8585 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8586 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8587 8588 // C++ [except.spec]p14: 8589 // An implicitly declared special member function (Clause 12) shall have an 8590 // exception-specification. [...] 8591 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8592 BaseEnd = ClassDecl->bases_end(); 8593 Base != BaseEnd; 8594 ++Base) { 8595 // Virtual bases are handled below. 8596 if (Base->isVirtual()) 8597 continue; 8598 8599 CXXRecordDecl *BaseClassDecl 8600 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8601 if (CXXConstructorDecl *CopyConstructor = 8602 LookupCopyingConstructor(BaseClassDecl, Quals)) 8603 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8604 } 8605 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8606 BaseEnd = ClassDecl->vbases_end(); 8607 Base != BaseEnd; 8608 ++Base) { 8609 CXXRecordDecl *BaseClassDecl 8610 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8611 if (CXXConstructorDecl *CopyConstructor = 8612 LookupCopyingConstructor(BaseClassDecl, Quals)) 8613 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8614 } 8615 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8616 FieldEnd = ClassDecl->field_end(); 8617 Field != FieldEnd; 8618 ++Field) { 8619 QualType FieldType = Context.getBaseElementType(Field->getType()); 8620 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8621 if (CXXConstructorDecl *CopyConstructor = 8622 LookupCopyingConstructor(FieldClassDecl, 8623 Quals | FieldType.getCVRQualifiers())) 8624 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8625 } 8626 } 8627 8628 return ExceptSpec; 8629} 8630 8631CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8632 CXXRecordDecl *ClassDecl) { 8633 // C++ [class.copy]p4: 8634 // If the class definition does not explicitly declare a copy 8635 // constructor, one is declared implicitly. 8636 8637 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8638 QualType ArgType = ClassType; 8639 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8640 if (Const) 8641 ArgType = ArgType.withConst(); 8642 ArgType = Context.getLValueReferenceType(ArgType); 8643 8644 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8645 CXXCopyConstructor, 8646 Const); 8647 8648 DeclarationName Name 8649 = Context.DeclarationNames.getCXXConstructorName( 8650 Context.getCanonicalType(ClassType)); 8651 SourceLocation ClassLoc = ClassDecl->getLocation(); 8652 DeclarationNameInfo NameInfo(Name, ClassLoc); 8653 8654 // An implicitly-declared copy constructor is an inline public 8655 // member of its class. 8656 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8657 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8658 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8659 Constexpr); 8660 CopyConstructor->setAccess(AS_public); 8661 CopyConstructor->setDefaulted(); 8662 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8663 8664 // Build an exception specification pointing back at this member. 8665 FunctionProtoType::ExtProtoInfo EPI; 8666 EPI.ExceptionSpecType = EST_Unevaluated; 8667 EPI.ExceptionSpecDecl = CopyConstructor; 8668 CopyConstructor->setType( 8669 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8670 8671 // Note that we have declared this constructor. 8672 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8673 8674 // Add the parameter to the constructor. 8675 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8676 ClassLoc, ClassLoc, 8677 /*IdentifierInfo=*/0, 8678 ArgType, /*TInfo=*/0, 8679 SC_None, 8680 SC_None, 0); 8681 CopyConstructor->setParams(FromParam); 8682 8683 if (Scope *S = getScopeForContext(ClassDecl)) 8684 PushOnScopeChains(CopyConstructor, S, false); 8685 ClassDecl->addDecl(CopyConstructor); 8686 8687 // C++11 [class.copy]p8: 8688 // ... If the class definition does not explicitly declare a copy 8689 // constructor, there is no user-declared move constructor, and there is no 8690 // user-declared move assignment operator, a copy constructor is implicitly 8691 // declared as defaulted. 8692 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8693 CopyConstructor->setDeletedAsWritten(); 8694 8695 return CopyConstructor; 8696} 8697 8698void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8699 CXXConstructorDecl *CopyConstructor) { 8700 assert((CopyConstructor->isDefaulted() && 8701 CopyConstructor->isCopyConstructor() && 8702 !CopyConstructor->doesThisDeclarationHaveABody() && 8703 !CopyConstructor->isDeleted()) && 8704 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8705 8706 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8707 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8708 8709 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8710 DiagnosticErrorTrap Trap(Diags); 8711 8712 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8713 Trap.hasErrorOccurred()) { 8714 Diag(CurrentLocation, diag::note_member_synthesized_at) 8715 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8716 CopyConstructor->setInvalidDecl(); 8717 } else { 8718 Sema::CompoundScopeRAII CompoundScope(*this); 8719 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8720 CopyConstructor->getLocation(), 8721 MultiStmtArg(), 8722 /*isStmtExpr=*/false) 8723 .takeAs<Stmt>()); 8724 CopyConstructor->setImplicitlyDefined(true); 8725 } 8726 8727 CopyConstructor->setUsed(); 8728 if (ASTMutationListener *L = getASTMutationListener()) { 8729 L->CompletedImplicitDefinition(CopyConstructor); 8730 } 8731} 8732 8733Sema::ImplicitExceptionSpecification 8734Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8735 CXXRecordDecl *ClassDecl = MD->getParent(); 8736 8737 // C++ [except.spec]p14: 8738 // An implicitly declared special member function (Clause 12) shall have an 8739 // exception-specification. [...] 8740 ImplicitExceptionSpecification ExceptSpec(*this); 8741 if (ClassDecl->isInvalidDecl()) 8742 return ExceptSpec; 8743 8744 // Direct base-class constructors. 8745 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8746 BEnd = ClassDecl->bases_end(); 8747 B != BEnd; ++B) { 8748 if (B->isVirtual()) // Handled below. 8749 continue; 8750 8751 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8752 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8753 CXXConstructorDecl *Constructor = 8754 LookupMovingConstructor(BaseClassDecl, 0); 8755 // If this is a deleted function, add it anyway. This might be conformant 8756 // with the standard. This might not. I'm not sure. It might not matter. 8757 if (Constructor) 8758 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8759 } 8760 } 8761 8762 // Virtual base-class constructors. 8763 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8764 BEnd = ClassDecl->vbases_end(); 8765 B != BEnd; ++B) { 8766 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8767 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8768 CXXConstructorDecl *Constructor = 8769 LookupMovingConstructor(BaseClassDecl, 0); 8770 // If this is a deleted function, add it anyway. This might be conformant 8771 // with the standard. This might not. I'm not sure. It might not matter. 8772 if (Constructor) 8773 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8774 } 8775 } 8776 8777 // Field constructors. 8778 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8779 FEnd = ClassDecl->field_end(); 8780 F != FEnd; ++F) { 8781 QualType FieldType = Context.getBaseElementType(F->getType()); 8782 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8783 CXXConstructorDecl *Constructor = 8784 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8785 // If this is a deleted function, add it anyway. This might be conformant 8786 // with the standard. This might not. I'm not sure. It might not matter. 8787 // In particular, the problem is that this function never gets called. It 8788 // might just be ill-formed because this function attempts to refer to 8789 // a deleted function here. 8790 if (Constructor) 8791 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8792 } 8793 } 8794 8795 return ExceptSpec; 8796} 8797 8798CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8799 CXXRecordDecl *ClassDecl) { 8800 // C++11 [class.copy]p9: 8801 // If the definition of a class X does not explicitly declare a move 8802 // constructor, one will be implicitly declared as defaulted if and only if: 8803 // 8804 // - [first 4 bullets] 8805 assert(ClassDecl->needsImplicitMoveConstructor()); 8806 8807 // [Checked after we build the declaration] 8808 // - the move assignment operator would not be implicitly defined as 8809 // deleted, 8810 8811 // [DR1402]: 8812 // - each of X's non-static data members and direct or virtual base classes 8813 // has a type that either has a move constructor or is trivially copyable. 8814 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8815 ClassDecl->setFailedImplicitMoveConstructor(); 8816 return 0; 8817 } 8818 8819 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8820 QualType ArgType = Context.getRValueReferenceType(ClassType); 8821 8822 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8823 CXXMoveConstructor, 8824 false); 8825 8826 DeclarationName Name 8827 = Context.DeclarationNames.getCXXConstructorName( 8828 Context.getCanonicalType(ClassType)); 8829 SourceLocation ClassLoc = ClassDecl->getLocation(); 8830 DeclarationNameInfo NameInfo(Name, ClassLoc); 8831 8832 // C++0x [class.copy]p11: 8833 // An implicitly-declared copy/move constructor is an inline public 8834 // member of its class. 8835 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8836 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8837 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8838 Constexpr); 8839 MoveConstructor->setAccess(AS_public); 8840 MoveConstructor->setDefaulted(); 8841 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8842 8843 // Build an exception specification pointing back at this member. 8844 FunctionProtoType::ExtProtoInfo EPI; 8845 EPI.ExceptionSpecType = EST_Unevaluated; 8846 EPI.ExceptionSpecDecl = MoveConstructor; 8847 MoveConstructor->setType( 8848 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8849 8850 // Add the parameter to the constructor. 8851 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8852 ClassLoc, ClassLoc, 8853 /*IdentifierInfo=*/0, 8854 ArgType, /*TInfo=*/0, 8855 SC_None, 8856 SC_None, 0); 8857 MoveConstructor->setParams(FromParam); 8858 8859 // C++0x [class.copy]p9: 8860 // If the definition of a class X does not explicitly declare a move 8861 // constructor, one will be implicitly declared as defaulted if and only if: 8862 // [...] 8863 // - the move constructor would not be implicitly defined as deleted. 8864 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8865 // Cache this result so that we don't try to generate this over and over 8866 // on every lookup, leaking memory and wasting time. 8867 ClassDecl->setFailedImplicitMoveConstructor(); 8868 return 0; 8869 } 8870 8871 // Note that we have declared this constructor. 8872 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8873 8874 if (Scope *S = getScopeForContext(ClassDecl)) 8875 PushOnScopeChains(MoveConstructor, S, false); 8876 ClassDecl->addDecl(MoveConstructor); 8877 8878 return MoveConstructor; 8879} 8880 8881void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8882 CXXConstructorDecl *MoveConstructor) { 8883 assert((MoveConstructor->isDefaulted() && 8884 MoveConstructor->isMoveConstructor() && 8885 !MoveConstructor->doesThisDeclarationHaveABody() && 8886 !MoveConstructor->isDeleted()) && 8887 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8888 8889 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8890 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8891 8892 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8893 DiagnosticErrorTrap Trap(Diags); 8894 8895 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8896 Trap.hasErrorOccurred()) { 8897 Diag(CurrentLocation, diag::note_member_synthesized_at) 8898 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8899 MoveConstructor->setInvalidDecl(); 8900 } else { 8901 Sema::CompoundScopeRAII CompoundScope(*this); 8902 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8903 MoveConstructor->getLocation(), 8904 MultiStmtArg(), 8905 /*isStmtExpr=*/false) 8906 .takeAs<Stmt>()); 8907 MoveConstructor->setImplicitlyDefined(true); 8908 } 8909 8910 MoveConstructor->setUsed(); 8911 8912 if (ASTMutationListener *L = getASTMutationListener()) { 8913 L->CompletedImplicitDefinition(MoveConstructor); 8914 } 8915} 8916 8917bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8918 return FD->isDeleted() && 8919 (FD->isDefaulted() || FD->isImplicit()) && 8920 isa<CXXMethodDecl>(FD); 8921} 8922 8923/// \brief Mark the call operator of the given lambda closure type as "used". 8924static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8925 CXXMethodDecl *CallOperator 8926 = cast<CXXMethodDecl>( 8927 *Lambda->lookup( 8928 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8929 CallOperator->setReferenced(); 8930 CallOperator->setUsed(); 8931} 8932 8933void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8934 SourceLocation CurrentLocation, 8935 CXXConversionDecl *Conv) 8936{ 8937 CXXRecordDecl *Lambda = Conv->getParent(); 8938 8939 // Make sure that the lambda call operator is marked used. 8940 markLambdaCallOperatorUsed(*this, Lambda); 8941 8942 Conv->setUsed(); 8943 8944 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8945 DiagnosticErrorTrap Trap(Diags); 8946 8947 // Return the address of the __invoke function. 8948 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8949 CXXMethodDecl *Invoke 8950 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8951 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8952 VK_LValue, Conv->getLocation()).take(); 8953 assert(FunctionRef && "Can't refer to __invoke function?"); 8954 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8955 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8956 Conv->getLocation(), 8957 Conv->getLocation())); 8958 8959 // Fill in the __invoke function with a dummy implementation. IR generation 8960 // will fill in the actual details. 8961 Invoke->setUsed(); 8962 Invoke->setReferenced(); 8963 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8964 8965 if (ASTMutationListener *L = getASTMutationListener()) { 8966 L->CompletedImplicitDefinition(Conv); 8967 L->CompletedImplicitDefinition(Invoke); 8968 } 8969} 8970 8971void Sema::DefineImplicitLambdaToBlockPointerConversion( 8972 SourceLocation CurrentLocation, 8973 CXXConversionDecl *Conv) 8974{ 8975 Conv->setUsed(); 8976 8977 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8978 DiagnosticErrorTrap Trap(Diags); 8979 8980 // Copy-initialize the lambda object as needed to capture it. 8981 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8982 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8983 8984 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8985 Conv->getLocation(), 8986 Conv, DerefThis); 8987 8988 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8989 // behavior. Note that only the general conversion function does this 8990 // (since it's unusable otherwise); in the case where we inline the 8991 // block literal, it has block literal lifetime semantics. 8992 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8993 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8994 CK_CopyAndAutoreleaseBlockObject, 8995 BuildBlock.get(), 0, VK_RValue); 8996 8997 if (BuildBlock.isInvalid()) { 8998 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8999 Conv->setInvalidDecl(); 9000 return; 9001 } 9002 9003 // Create the return statement that returns the block from the conversion 9004 // function. 9005 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9006 if (Return.isInvalid()) { 9007 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9008 Conv->setInvalidDecl(); 9009 return; 9010 } 9011 9012 // Set the body of the conversion function. 9013 Stmt *ReturnS = Return.take(); 9014 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9015 Conv->getLocation(), 9016 Conv->getLocation())); 9017 9018 // We're done; notify the mutation listener, if any. 9019 if (ASTMutationListener *L = getASTMutationListener()) { 9020 L->CompletedImplicitDefinition(Conv); 9021 } 9022} 9023 9024/// \brief Determine whether the given list arguments contains exactly one 9025/// "real" (non-default) argument. 9026static bool hasOneRealArgument(MultiExprArg Args) { 9027 switch (Args.size()) { 9028 case 0: 9029 return false; 9030 9031 default: 9032 if (!Args[1]->isDefaultArgument()) 9033 return false; 9034 9035 // fall through 9036 case 1: 9037 return !Args[0]->isDefaultArgument(); 9038 } 9039 9040 return false; 9041} 9042 9043ExprResult 9044Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9045 CXXConstructorDecl *Constructor, 9046 MultiExprArg ExprArgs, 9047 bool HadMultipleCandidates, 9048 bool RequiresZeroInit, 9049 unsigned ConstructKind, 9050 SourceRange ParenRange) { 9051 bool Elidable = false; 9052 9053 // C++0x [class.copy]p34: 9054 // When certain criteria are met, an implementation is allowed to 9055 // omit the copy/move construction of a class object, even if the 9056 // copy/move constructor and/or destructor for the object have 9057 // side effects. [...] 9058 // - when a temporary class object that has not been bound to a 9059 // reference (12.2) would be copied/moved to a class object 9060 // with the same cv-unqualified type, the copy/move operation 9061 // can be omitted by constructing the temporary object 9062 // directly into the target of the omitted copy/move 9063 if (ConstructKind == CXXConstructExpr::CK_Complete && 9064 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9065 Expr *SubExpr = ExprArgs[0]; 9066 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9067 } 9068 9069 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9070 Elidable, ExprArgs, HadMultipleCandidates, 9071 RequiresZeroInit, ConstructKind, ParenRange); 9072} 9073 9074/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9075/// including handling of its default argument expressions. 9076ExprResult 9077Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9078 CXXConstructorDecl *Constructor, bool Elidable, 9079 MultiExprArg ExprArgs, 9080 bool HadMultipleCandidates, 9081 bool RequiresZeroInit, 9082 unsigned ConstructKind, 9083 SourceRange ParenRange) { 9084 MarkFunctionReferenced(ConstructLoc, Constructor); 9085 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9086 Constructor, Elidable, ExprArgs, 9087 HadMultipleCandidates, /*FIXME*/false, 9088 RequiresZeroInit, 9089 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9090 ParenRange)); 9091} 9092 9093bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9094 CXXConstructorDecl *Constructor, 9095 MultiExprArg Exprs, 9096 bool HadMultipleCandidates) { 9097 // FIXME: Provide the correct paren SourceRange when available. 9098 ExprResult TempResult = 9099 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9100 Exprs, HadMultipleCandidates, false, 9101 CXXConstructExpr::CK_Complete, SourceRange()); 9102 if (TempResult.isInvalid()) 9103 return true; 9104 9105 Expr *Temp = TempResult.takeAs<Expr>(); 9106 CheckImplicitConversions(Temp, VD->getLocation()); 9107 MarkFunctionReferenced(VD->getLocation(), Constructor); 9108 Temp = MaybeCreateExprWithCleanups(Temp); 9109 VD->setInit(Temp); 9110 9111 return false; 9112} 9113 9114void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9115 if (VD->isInvalidDecl()) return; 9116 9117 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9118 if (ClassDecl->isInvalidDecl()) return; 9119 if (ClassDecl->hasIrrelevantDestructor()) return; 9120 if (ClassDecl->isDependentContext()) return; 9121 9122 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9123 MarkFunctionReferenced(VD->getLocation(), Destructor); 9124 CheckDestructorAccess(VD->getLocation(), Destructor, 9125 PDiag(diag::err_access_dtor_var) 9126 << VD->getDeclName() 9127 << VD->getType()); 9128 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9129 9130 if (!VD->hasGlobalStorage()) return; 9131 9132 // Emit warning for non-trivial dtor in global scope (a real global, 9133 // class-static, function-static). 9134 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9135 9136 // TODO: this should be re-enabled for static locals by !CXAAtExit 9137 if (!VD->isStaticLocal()) 9138 Diag(VD->getLocation(), diag::warn_global_destructor); 9139} 9140 9141/// \brief Given a constructor and the set of arguments provided for the 9142/// constructor, convert the arguments and add any required default arguments 9143/// to form a proper call to this constructor. 9144/// 9145/// \returns true if an error occurred, false otherwise. 9146bool 9147Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9148 MultiExprArg ArgsPtr, 9149 SourceLocation Loc, 9150 SmallVectorImpl<Expr*> &ConvertedArgs, 9151 bool AllowExplicit) { 9152 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9153 unsigned NumArgs = ArgsPtr.size(); 9154 Expr **Args = ArgsPtr.data(); 9155 9156 const FunctionProtoType *Proto 9157 = Constructor->getType()->getAs<FunctionProtoType>(); 9158 assert(Proto && "Constructor without a prototype?"); 9159 unsigned NumArgsInProto = Proto->getNumArgs(); 9160 9161 // If too few arguments are available, we'll fill in the rest with defaults. 9162 if (NumArgs < NumArgsInProto) 9163 ConvertedArgs.reserve(NumArgsInProto); 9164 else 9165 ConvertedArgs.reserve(NumArgs); 9166 9167 VariadicCallType CallType = 9168 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9169 SmallVector<Expr *, 8> AllArgs; 9170 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9171 Proto, 0, Args, NumArgs, AllArgs, 9172 CallType, AllowExplicit); 9173 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9174 9175 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9176 9177 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9178 Proto, Loc); 9179 9180 return Invalid; 9181} 9182 9183static inline bool 9184CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9185 const FunctionDecl *FnDecl) { 9186 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9187 if (isa<NamespaceDecl>(DC)) { 9188 return SemaRef.Diag(FnDecl->getLocation(), 9189 diag::err_operator_new_delete_declared_in_namespace) 9190 << FnDecl->getDeclName(); 9191 } 9192 9193 if (isa<TranslationUnitDecl>(DC) && 9194 FnDecl->getStorageClass() == SC_Static) { 9195 return SemaRef.Diag(FnDecl->getLocation(), 9196 diag::err_operator_new_delete_declared_static) 9197 << FnDecl->getDeclName(); 9198 } 9199 9200 return false; 9201} 9202 9203static inline bool 9204CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9205 CanQualType ExpectedResultType, 9206 CanQualType ExpectedFirstParamType, 9207 unsigned DependentParamTypeDiag, 9208 unsigned InvalidParamTypeDiag) { 9209 QualType ResultType = 9210 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9211 9212 // Check that the result type is not dependent. 9213 if (ResultType->isDependentType()) 9214 return SemaRef.Diag(FnDecl->getLocation(), 9215 diag::err_operator_new_delete_dependent_result_type) 9216 << FnDecl->getDeclName() << ExpectedResultType; 9217 9218 // Check that the result type is what we expect. 9219 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9220 return SemaRef.Diag(FnDecl->getLocation(), 9221 diag::err_operator_new_delete_invalid_result_type) 9222 << FnDecl->getDeclName() << ExpectedResultType; 9223 9224 // A function template must have at least 2 parameters. 9225 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9226 return SemaRef.Diag(FnDecl->getLocation(), 9227 diag::err_operator_new_delete_template_too_few_parameters) 9228 << FnDecl->getDeclName(); 9229 9230 // The function decl must have at least 1 parameter. 9231 if (FnDecl->getNumParams() == 0) 9232 return SemaRef.Diag(FnDecl->getLocation(), 9233 diag::err_operator_new_delete_too_few_parameters) 9234 << FnDecl->getDeclName(); 9235 9236 // Check the first parameter type is not dependent. 9237 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9238 if (FirstParamType->isDependentType()) 9239 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9240 << FnDecl->getDeclName() << ExpectedFirstParamType; 9241 9242 // Check that the first parameter type is what we expect. 9243 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9244 ExpectedFirstParamType) 9245 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9246 << FnDecl->getDeclName() << ExpectedFirstParamType; 9247 9248 return false; 9249} 9250 9251static bool 9252CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9253 // C++ [basic.stc.dynamic.allocation]p1: 9254 // A program is ill-formed if an allocation function is declared in a 9255 // namespace scope other than global scope or declared static in global 9256 // scope. 9257 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9258 return true; 9259 9260 CanQualType SizeTy = 9261 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9262 9263 // C++ [basic.stc.dynamic.allocation]p1: 9264 // The return type shall be void*. The first parameter shall have type 9265 // std::size_t. 9266 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9267 SizeTy, 9268 diag::err_operator_new_dependent_param_type, 9269 diag::err_operator_new_param_type)) 9270 return true; 9271 9272 // C++ [basic.stc.dynamic.allocation]p1: 9273 // The first parameter shall not have an associated default argument. 9274 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9275 return SemaRef.Diag(FnDecl->getLocation(), 9276 diag::err_operator_new_default_arg) 9277 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9278 9279 return false; 9280} 9281 9282static bool 9283CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9284 // C++ [basic.stc.dynamic.deallocation]p1: 9285 // A program is ill-formed if deallocation functions are declared in a 9286 // namespace scope other than global scope or declared static in global 9287 // scope. 9288 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9289 return true; 9290 9291 // C++ [basic.stc.dynamic.deallocation]p2: 9292 // Each deallocation function shall return void and its first parameter 9293 // shall be void*. 9294 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9295 SemaRef.Context.VoidPtrTy, 9296 diag::err_operator_delete_dependent_param_type, 9297 diag::err_operator_delete_param_type)) 9298 return true; 9299 9300 return false; 9301} 9302 9303/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9304/// of this overloaded operator is well-formed. If so, returns false; 9305/// otherwise, emits appropriate diagnostics and returns true. 9306bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9307 assert(FnDecl && FnDecl->isOverloadedOperator() && 9308 "Expected an overloaded operator declaration"); 9309 9310 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9311 9312 // C++ [over.oper]p5: 9313 // The allocation and deallocation functions, operator new, 9314 // operator new[], operator delete and operator delete[], are 9315 // described completely in 3.7.3. The attributes and restrictions 9316 // found in the rest of this subclause do not apply to them unless 9317 // explicitly stated in 3.7.3. 9318 if (Op == OO_Delete || Op == OO_Array_Delete) 9319 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9320 9321 if (Op == OO_New || Op == OO_Array_New) 9322 return CheckOperatorNewDeclaration(*this, FnDecl); 9323 9324 // C++ [over.oper]p6: 9325 // An operator function shall either be a non-static member 9326 // function or be a non-member function and have at least one 9327 // parameter whose type is a class, a reference to a class, an 9328 // enumeration, or a reference to an enumeration. 9329 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9330 if (MethodDecl->isStatic()) 9331 return Diag(FnDecl->getLocation(), 9332 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9333 } else { 9334 bool ClassOrEnumParam = false; 9335 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9336 ParamEnd = FnDecl->param_end(); 9337 Param != ParamEnd; ++Param) { 9338 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9339 if (ParamType->isDependentType() || ParamType->isRecordType() || 9340 ParamType->isEnumeralType()) { 9341 ClassOrEnumParam = true; 9342 break; 9343 } 9344 } 9345 9346 if (!ClassOrEnumParam) 9347 return Diag(FnDecl->getLocation(), 9348 diag::err_operator_overload_needs_class_or_enum) 9349 << FnDecl->getDeclName(); 9350 } 9351 9352 // C++ [over.oper]p8: 9353 // An operator function cannot have default arguments (8.3.6), 9354 // except where explicitly stated below. 9355 // 9356 // Only the function-call operator allows default arguments 9357 // (C++ [over.call]p1). 9358 if (Op != OO_Call) { 9359 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9360 Param != FnDecl->param_end(); ++Param) { 9361 if ((*Param)->hasDefaultArg()) 9362 return Diag((*Param)->getLocation(), 9363 diag::err_operator_overload_default_arg) 9364 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9365 } 9366 } 9367 9368 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9369 { false, false, false } 9370#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9371 , { Unary, Binary, MemberOnly } 9372#include "clang/Basic/OperatorKinds.def" 9373 }; 9374 9375 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9376 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9377 bool MustBeMemberOperator = OperatorUses[Op][2]; 9378 9379 // C++ [over.oper]p8: 9380 // [...] Operator functions cannot have more or fewer parameters 9381 // than the number required for the corresponding operator, as 9382 // described in the rest of this subclause. 9383 unsigned NumParams = FnDecl->getNumParams() 9384 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9385 if (Op != OO_Call && 9386 ((NumParams == 1 && !CanBeUnaryOperator) || 9387 (NumParams == 2 && !CanBeBinaryOperator) || 9388 (NumParams < 1) || (NumParams > 2))) { 9389 // We have the wrong number of parameters. 9390 unsigned ErrorKind; 9391 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9392 ErrorKind = 2; // 2 -> unary or binary. 9393 } else if (CanBeUnaryOperator) { 9394 ErrorKind = 0; // 0 -> unary 9395 } else { 9396 assert(CanBeBinaryOperator && 9397 "All non-call overloaded operators are unary or binary!"); 9398 ErrorKind = 1; // 1 -> binary 9399 } 9400 9401 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9402 << FnDecl->getDeclName() << NumParams << ErrorKind; 9403 } 9404 9405 // Overloaded operators other than operator() cannot be variadic. 9406 if (Op != OO_Call && 9407 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9408 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9409 << FnDecl->getDeclName(); 9410 } 9411 9412 // Some operators must be non-static member functions. 9413 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9414 return Diag(FnDecl->getLocation(), 9415 diag::err_operator_overload_must_be_member) 9416 << FnDecl->getDeclName(); 9417 } 9418 9419 // C++ [over.inc]p1: 9420 // The user-defined function called operator++ implements the 9421 // prefix and postfix ++ operator. If this function is a member 9422 // function with no parameters, or a non-member function with one 9423 // parameter of class or enumeration type, it defines the prefix 9424 // increment operator ++ for objects of that type. If the function 9425 // is a member function with one parameter (which shall be of type 9426 // int) or a non-member function with two parameters (the second 9427 // of which shall be of type int), it defines the postfix 9428 // increment operator ++ for objects of that type. 9429 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9430 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9431 bool ParamIsInt = false; 9432 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9433 ParamIsInt = BT->getKind() == BuiltinType::Int; 9434 9435 if (!ParamIsInt) 9436 return Diag(LastParam->getLocation(), 9437 diag::err_operator_overload_post_incdec_must_be_int) 9438 << LastParam->getType() << (Op == OO_MinusMinus); 9439 } 9440 9441 return false; 9442} 9443 9444/// CheckLiteralOperatorDeclaration - Check whether the declaration 9445/// of this literal operator function is well-formed. If so, returns 9446/// false; otherwise, emits appropriate diagnostics and returns true. 9447bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9448 if (isa<CXXMethodDecl>(FnDecl)) { 9449 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9450 << FnDecl->getDeclName(); 9451 return true; 9452 } 9453 9454 if (FnDecl->isExternC()) { 9455 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9456 return true; 9457 } 9458 9459 bool Valid = false; 9460 9461 // This might be the definition of a literal operator template. 9462 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9463 // This might be a specialization of a literal operator template. 9464 if (!TpDecl) 9465 TpDecl = FnDecl->getPrimaryTemplate(); 9466 9467 // template <char...> type operator "" name() is the only valid template 9468 // signature, and the only valid signature with no parameters. 9469 if (TpDecl) { 9470 if (FnDecl->param_size() == 0) { 9471 // Must have only one template parameter 9472 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9473 if (Params->size() == 1) { 9474 NonTypeTemplateParmDecl *PmDecl = 9475 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9476 9477 // The template parameter must be a char parameter pack. 9478 if (PmDecl && PmDecl->isTemplateParameterPack() && 9479 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9480 Valid = true; 9481 } 9482 } 9483 } else if (FnDecl->param_size()) { 9484 // Check the first parameter 9485 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9486 9487 QualType T = (*Param)->getType().getUnqualifiedType(); 9488 9489 // unsigned long long int, long double, and any character type are allowed 9490 // as the only parameters. 9491 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9492 Context.hasSameType(T, Context.LongDoubleTy) || 9493 Context.hasSameType(T, Context.CharTy) || 9494 Context.hasSameType(T, Context.WCharTy) || 9495 Context.hasSameType(T, Context.Char16Ty) || 9496 Context.hasSameType(T, Context.Char32Ty)) { 9497 if (++Param == FnDecl->param_end()) 9498 Valid = true; 9499 goto FinishedParams; 9500 } 9501 9502 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9503 const PointerType *PT = T->getAs<PointerType>(); 9504 if (!PT) 9505 goto FinishedParams; 9506 T = PT->getPointeeType(); 9507 if (!T.isConstQualified() || T.isVolatileQualified()) 9508 goto FinishedParams; 9509 T = T.getUnqualifiedType(); 9510 9511 // Move on to the second parameter; 9512 ++Param; 9513 9514 // If there is no second parameter, the first must be a const char * 9515 if (Param == FnDecl->param_end()) { 9516 if (Context.hasSameType(T, Context.CharTy)) 9517 Valid = true; 9518 goto FinishedParams; 9519 } 9520 9521 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9522 // are allowed as the first parameter to a two-parameter function 9523 if (!(Context.hasSameType(T, Context.CharTy) || 9524 Context.hasSameType(T, Context.WCharTy) || 9525 Context.hasSameType(T, Context.Char16Ty) || 9526 Context.hasSameType(T, Context.Char32Ty))) 9527 goto FinishedParams; 9528 9529 // The second and final parameter must be an std::size_t 9530 T = (*Param)->getType().getUnqualifiedType(); 9531 if (Context.hasSameType(T, Context.getSizeType()) && 9532 ++Param == FnDecl->param_end()) 9533 Valid = true; 9534 } 9535 9536 // FIXME: This diagnostic is absolutely terrible. 9537FinishedParams: 9538 if (!Valid) { 9539 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9540 << FnDecl->getDeclName(); 9541 return true; 9542 } 9543 9544 // A parameter-declaration-clause containing a default argument is not 9545 // equivalent to any of the permitted forms. 9546 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9547 ParamEnd = FnDecl->param_end(); 9548 Param != ParamEnd; ++Param) { 9549 if ((*Param)->hasDefaultArg()) { 9550 Diag((*Param)->getDefaultArgRange().getBegin(), 9551 diag::err_literal_operator_default_argument) 9552 << (*Param)->getDefaultArgRange(); 9553 break; 9554 } 9555 } 9556 9557 StringRef LiteralName 9558 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9559 if (LiteralName[0] != '_') { 9560 // C++11 [usrlit.suffix]p1: 9561 // Literal suffix identifiers that do not start with an underscore 9562 // are reserved for future standardization. 9563 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9564 } 9565 9566 return false; 9567} 9568 9569/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9570/// linkage specification, including the language and (if present) 9571/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9572/// the location of the language string literal, which is provided 9573/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9574/// the '{' brace. Otherwise, this linkage specification does not 9575/// have any braces. 9576Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9577 SourceLocation LangLoc, 9578 StringRef Lang, 9579 SourceLocation LBraceLoc) { 9580 LinkageSpecDecl::LanguageIDs Language; 9581 if (Lang == "\"C\"") 9582 Language = LinkageSpecDecl::lang_c; 9583 else if (Lang == "\"C++\"") 9584 Language = LinkageSpecDecl::lang_cxx; 9585 else { 9586 Diag(LangLoc, diag::err_bad_language); 9587 return 0; 9588 } 9589 9590 // FIXME: Add all the various semantics of linkage specifications 9591 9592 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9593 ExternLoc, LangLoc, Language); 9594 CurContext->addDecl(D); 9595 PushDeclContext(S, D); 9596 return D; 9597} 9598 9599/// ActOnFinishLinkageSpecification - Complete the definition of 9600/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9601/// valid, it's the position of the closing '}' brace in a linkage 9602/// specification that uses braces. 9603Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9604 Decl *LinkageSpec, 9605 SourceLocation RBraceLoc) { 9606 if (LinkageSpec) { 9607 if (RBraceLoc.isValid()) { 9608 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9609 LSDecl->setRBraceLoc(RBraceLoc); 9610 } 9611 PopDeclContext(); 9612 } 9613 return LinkageSpec; 9614} 9615 9616/// \brief Perform semantic analysis for the variable declaration that 9617/// occurs within a C++ catch clause, returning the newly-created 9618/// variable. 9619VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9620 TypeSourceInfo *TInfo, 9621 SourceLocation StartLoc, 9622 SourceLocation Loc, 9623 IdentifierInfo *Name) { 9624 bool Invalid = false; 9625 QualType ExDeclType = TInfo->getType(); 9626 9627 // Arrays and functions decay. 9628 if (ExDeclType->isArrayType()) 9629 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9630 else if (ExDeclType->isFunctionType()) 9631 ExDeclType = Context.getPointerType(ExDeclType); 9632 9633 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9634 // The exception-declaration shall not denote a pointer or reference to an 9635 // incomplete type, other than [cv] void*. 9636 // N2844 forbids rvalue references. 9637 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9638 Diag(Loc, diag::err_catch_rvalue_ref); 9639 Invalid = true; 9640 } 9641 9642 QualType BaseType = ExDeclType; 9643 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9644 unsigned DK = diag::err_catch_incomplete; 9645 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9646 BaseType = Ptr->getPointeeType(); 9647 Mode = 1; 9648 DK = diag::err_catch_incomplete_ptr; 9649 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9650 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9651 BaseType = Ref->getPointeeType(); 9652 Mode = 2; 9653 DK = diag::err_catch_incomplete_ref; 9654 } 9655 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9656 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9657 Invalid = true; 9658 9659 if (!Invalid && !ExDeclType->isDependentType() && 9660 RequireNonAbstractType(Loc, ExDeclType, 9661 diag::err_abstract_type_in_decl, 9662 AbstractVariableType)) 9663 Invalid = true; 9664 9665 // Only the non-fragile NeXT runtime currently supports C++ catches 9666 // of ObjC types, and no runtime supports catching ObjC types by value. 9667 if (!Invalid && getLangOpts().ObjC1) { 9668 QualType T = ExDeclType; 9669 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9670 T = RT->getPointeeType(); 9671 9672 if (T->isObjCObjectType()) { 9673 Diag(Loc, diag::err_objc_object_catch); 9674 Invalid = true; 9675 } else if (T->isObjCObjectPointerType()) { 9676 // FIXME: should this be a test for macosx-fragile specifically? 9677 if (getLangOpts().ObjCRuntime.isFragile()) 9678 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9679 } 9680 } 9681 9682 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9683 ExDeclType, TInfo, SC_None, SC_None); 9684 ExDecl->setExceptionVariable(true); 9685 9686 // In ARC, infer 'retaining' for variables of retainable type. 9687 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9688 Invalid = true; 9689 9690 if (!Invalid && !ExDeclType->isDependentType()) { 9691 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9692 // C++ [except.handle]p16: 9693 // The object declared in an exception-declaration or, if the 9694 // exception-declaration does not specify a name, a temporary (12.2) is 9695 // copy-initialized (8.5) from the exception object. [...] 9696 // The object is destroyed when the handler exits, after the destruction 9697 // of any automatic objects initialized within the handler. 9698 // 9699 // We just pretend to initialize the object with itself, then make sure 9700 // it can be destroyed later. 9701 QualType initType = ExDeclType; 9702 9703 InitializedEntity entity = 9704 InitializedEntity::InitializeVariable(ExDecl); 9705 InitializationKind initKind = 9706 InitializationKind::CreateCopy(Loc, SourceLocation()); 9707 9708 Expr *opaqueValue = 9709 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9710 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9711 ExprResult result = sequence.Perform(*this, entity, initKind, 9712 MultiExprArg(&opaqueValue, 1)); 9713 if (result.isInvalid()) 9714 Invalid = true; 9715 else { 9716 // If the constructor used was non-trivial, set this as the 9717 // "initializer". 9718 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9719 if (!construct->getConstructor()->isTrivial()) { 9720 Expr *init = MaybeCreateExprWithCleanups(construct); 9721 ExDecl->setInit(init); 9722 } 9723 9724 // And make sure it's destructable. 9725 FinalizeVarWithDestructor(ExDecl, recordType); 9726 } 9727 } 9728 } 9729 9730 if (Invalid) 9731 ExDecl->setInvalidDecl(); 9732 9733 return ExDecl; 9734} 9735 9736/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9737/// handler. 9738Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9739 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9740 bool Invalid = D.isInvalidType(); 9741 9742 // Check for unexpanded parameter packs. 9743 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9744 UPPC_ExceptionType)) { 9745 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9746 D.getIdentifierLoc()); 9747 Invalid = true; 9748 } 9749 9750 IdentifierInfo *II = D.getIdentifier(); 9751 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9752 LookupOrdinaryName, 9753 ForRedeclaration)) { 9754 // The scope should be freshly made just for us. There is just no way 9755 // it contains any previous declaration. 9756 assert(!S->isDeclScope(PrevDecl)); 9757 if (PrevDecl->isTemplateParameter()) { 9758 // Maybe we will complain about the shadowed template parameter. 9759 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9760 PrevDecl = 0; 9761 } 9762 } 9763 9764 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9765 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9766 << D.getCXXScopeSpec().getRange(); 9767 Invalid = true; 9768 } 9769 9770 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9771 D.getLocStart(), 9772 D.getIdentifierLoc(), 9773 D.getIdentifier()); 9774 if (Invalid) 9775 ExDecl->setInvalidDecl(); 9776 9777 // Add the exception declaration into this scope. 9778 if (II) 9779 PushOnScopeChains(ExDecl, S); 9780 else 9781 CurContext->addDecl(ExDecl); 9782 9783 ProcessDeclAttributes(S, ExDecl, D); 9784 return ExDecl; 9785} 9786 9787Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9788 Expr *AssertExpr, 9789 Expr *AssertMessageExpr, 9790 SourceLocation RParenLoc) { 9791 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9792 9793 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9794 return 0; 9795 9796 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9797 AssertMessage, RParenLoc, false); 9798} 9799 9800Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9801 Expr *AssertExpr, 9802 StringLiteral *AssertMessage, 9803 SourceLocation RParenLoc, 9804 bool Failed) { 9805 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9806 !Failed) { 9807 // In a static_assert-declaration, the constant-expression shall be a 9808 // constant expression that can be contextually converted to bool. 9809 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9810 if (Converted.isInvalid()) 9811 Failed = true; 9812 9813 llvm::APSInt Cond; 9814 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9815 diag::err_static_assert_expression_is_not_constant, 9816 /*AllowFold=*/false).isInvalid()) 9817 Failed = true; 9818 9819 if (!Failed && !Cond) { 9820 llvm::SmallString<256> MsgBuffer; 9821 llvm::raw_svector_ostream Msg(MsgBuffer); 9822 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9823 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9824 << Msg.str() << AssertExpr->getSourceRange(); 9825 Failed = true; 9826 } 9827 } 9828 9829 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9830 AssertExpr, AssertMessage, RParenLoc, 9831 Failed); 9832 9833 CurContext->addDecl(Decl); 9834 return Decl; 9835} 9836 9837/// \brief Perform semantic analysis of the given friend type declaration. 9838/// 9839/// \returns A friend declaration that. 9840FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9841 SourceLocation FriendLoc, 9842 TypeSourceInfo *TSInfo) { 9843 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9844 9845 QualType T = TSInfo->getType(); 9846 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9847 9848 // C++03 [class.friend]p2: 9849 // An elaborated-type-specifier shall be used in a friend declaration 9850 // for a class.* 9851 // 9852 // * The class-key of the elaborated-type-specifier is required. 9853 if (!ActiveTemplateInstantiations.empty()) { 9854 // Do not complain about the form of friend template types during 9855 // template instantiation; we will already have complained when the 9856 // template was declared. 9857 } else if (!T->isElaboratedTypeSpecifier()) { 9858 // If we evaluated the type to a record type, suggest putting 9859 // a tag in front. 9860 if (const RecordType *RT = T->getAs<RecordType>()) { 9861 RecordDecl *RD = RT->getDecl(); 9862 9863 std::string InsertionText = std::string(" ") + RD->getKindName(); 9864 9865 Diag(TypeRange.getBegin(), 9866 getLangOpts().CPlusPlus0x ? 9867 diag::warn_cxx98_compat_unelaborated_friend_type : 9868 diag::ext_unelaborated_friend_type) 9869 << (unsigned) RD->getTagKind() 9870 << T 9871 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9872 InsertionText); 9873 } else { 9874 Diag(FriendLoc, 9875 getLangOpts().CPlusPlus0x ? 9876 diag::warn_cxx98_compat_nonclass_type_friend : 9877 diag::ext_nonclass_type_friend) 9878 << T 9879 << SourceRange(FriendLoc, TypeRange.getEnd()); 9880 } 9881 } else if (T->getAs<EnumType>()) { 9882 Diag(FriendLoc, 9883 getLangOpts().CPlusPlus0x ? 9884 diag::warn_cxx98_compat_enum_friend : 9885 diag::ext_enum_friend) 9886 << T 9887 << SourceRange(FriendLoc, TypeRange.getEnd()); 9888 } 9889 9890 // C++0x [class.friend]p3: 9891 // If the type specifier in a friend declaration designates a (possibly 9892 // cv-qualified) class type, that class is declared as a friend; otherwise, 9893 // the friend declaration is ignored. 9894 9895 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9896 // in [class.friend]p3 that we do not implement. 9897 9898 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9899} 9900 9901/// Handle a friend tag declaration where the scope specifier was 9902/// templated. 9903Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9904 unsigned TagSpec, SourceLocation TagLoc, 9905 CXXScopeSpec &SS, 9906 IdentifierInfo *Name, SourceLocation NameLoc, 9907 AttributeList *Attr, 9908 MultiTemplateParamsArg TempParamLists) { 9909 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9910 9911 bool isExplicitSpecialization = false; 9912 bool Invalid = false; 9913 9914 if (TemplateParameterList *TemplateParams 9915 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9916 TempParamLists.data(), 9917 TempParamLists.size(), 9918 /*friend*/ true, 9919 isExplicitSpecialization, 9920 Invalid)) { 9921 if (TemplateParams->size() > 0) { 9922 // This is a declaration of a class template. 9923 if (Invalid) 9924 return 0; 9925 9926 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9927 SS, Name, NameLoc, Attr, 9928 TemplateParams, AS_public, 9929 /*ModulePrivateLoc=*/SourceLocation(), 9930 TempParamLists.size() - 1, 9931 TempParamLists.data()).take(); 9932 } else { 9933 // The "template<>" header is extraneous. 9934 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9935 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9936 isExplicitSpecialization = true; 9937 } 9938 } 9939 9940 if (Invalid) return 0; 9941 9942 bool isAllExplicitSpecializations = true; 9943 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9944 if (TempParamLists[I]->size()) { 9945 isAllExplicitSpecializations = false; 9946 break; 9947 } 9948 } 9949 9950 // FIXME: don't ignore attributes. 9951 9952 // If it's explicit specializations all the way down, just forget 9953 // about the template header and build an appropriate non-templated 9954 // friend. TODO: for source fidelity, remember the headers. 9955 if (isAllExplicitSpecializations) { 9956 if (SS.isEmpty()) { 9957 bool Owned = false; 9958 bool IsDependent = false; 9959 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9960 Attr, AS_public, 9961 /*ModulePrivateLoc=*/SourceLocation(), 9962 MultiTemplateParamsArg(), Owned, IsDependent, 9963 /*ScopedEnumKWLoc=*/SourceLocation(), 9964 /*ScopedEnumUsesClassTag=*/false, 9965 /*UnderlyingType=*/TypeResult()); 9966 } 9967 9968 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9969 ElaboratedTypeKeyword Keyword 9970 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9971 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9972 *Name, NameLoc); 9973 if (T.isNull()) 9974 return 0; 9975 9976 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9977 if (isa<DependentNameType>(T)) { 9978 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9979 TL.setElaboratedKeywordLoc(TagLoc); 9980 TL.setQualifierLoc(QualifierLoc); 9981 TL.setNameLoc(NameLoc); 9982 } else { 9983 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9984 TL.setElaboratedKeywordLoc(TagLoc); 9985 TL.setQualifierLoc(QualifierLoc); 9986 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9987 } 9988 9989 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9990 TSI, FriendLoc); 9991 Friend->setAccess(AS_public); 9992 CurContext->addDecl(Friend); 9993 return Friend; 9994 } 9995 9996 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9997 9998 9999 10000 // Handle the case of a templated-scope friend class. e.g. 10001 // template <class T> class A<T>::B; 10002 // FIXME: we don't support these right now. 10003 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10004 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10005 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10006 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10007 TL.setElaboratedKeywordLoc(TagLoc); 10008 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10009 TL.setNameLoc(NameLoc); 10010 10011 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10012 TSI, FriendLoc); 10013 Friend->setAccess(AS_public); 10014 Friend->setUnsupportedFriend(true); 10015 CurContext->addDecl(Friend); 10016 return Friend; 10017} 10018 10019 10020/// Handle a friend type declaration. This works in tandem with 10021/// ActOnTag. 10022/// 10023/// Notes on friend class templates: 10024/// 10025/// We generally treat friend class declarations as if they were 10026/// declaring a class. So, for example, the elaborated type specifier 10027/// in a friend declaration is required to obey the restrictions of a 10028/// class-head (i.e. no typedefs in the scope chain), template 10029/// parameters are required to match up with simple template-ids, &c. 10030/// However, unlike when declaring a template specialization, it's 10031/// okay to refer to a template specialization without an empty 10032/// template parameter declaration, e.g. 10033/// friend class A<T>::B<unsigned>; 10034/// We permit this as a special case; if there are any template 10035/// parameters present at all, require proper matching, i.e. 10036/// template <> template \<class T> friend class A<int>::B; 10037Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10038 MultiTemplateParamsArg TempParams) { 10039 SourceLocation Loc = DS.getLocStart(); 10040 10041 assert(DS.isFriendSpecified()); 10042 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10043 10044 // Try to convert the decl specifier to a type. This works for 10045 // friend templates because ActOnTag never produces a ClassTemplateDecl 10046 // for a TUK_Friend. 10047 Declarator TheDeclarator(DS, Declarator::MemberContext); 10048 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10049 QualType T = TSI->getType(); 10050 if (TheDeclarator.isInvalidType()) 10051 return 0; 10052 10053 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10054 return 0; 10055 10056 // This is definitely an error in C++98. It's probably meant to 10057 // be forbidden in C++0x, too, but the specification is just 10058 // poorly written. 10059 // 10060 // The problem is with declarations like the following: 10061 // template <T> friend A<T>::foo; 10062 // where deciding whether a class C is a friend or not now hinges 10063 // on whether there exists an instantiation of A that causes 10064 // 'foo' to equal C. There are restrictions on class-heads 10065 // (which we declare (by fiat) elaborated friend declarations to 10066 // be) that makes this tractable. 10067 // 10068 // FIXME: handle "template <> friend class A<T>;", which 10069 // is possibly well-formed? Who even knows? 10070 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10071 Diag(Loc, diag::err_tagless_friend_type_template) 10072 << DS.getSourceRange(); 10073 return 0; 10074 } 10075 10076 // C++98 [class.friend]p1: A friend of a class is a function 10077 // or class that is not a member of the class . . . 10078 // This is fixed in DR77, which just barely didn't make the C++03 10079 // deadline. It's also a very silly restriction that seriously 10080 // affects inner classes and which nobody else seems to implement; 10081 // thus we never diagnose it, not even in -pedantic. 10082 // 10083 // But note that we could warn about it: it's always useless to 10084 // friend one of your own members (it's not, however, worthless to 10085 // friend a member of an arbitrary specialization of your template). 10086 10087 Decl *D; 10088 if (unsigned NumTempParamLists = TempParams.size()) 10089 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10090 NumTempParamLists, 10091 TempParams.data(), 10092 TSI, 10093 DS.getFriendSpecLoc()); 10094 else 10095 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10096 10097 if (!D) 10098 return 0; 10099 10100 D->setAccess(AS_public); 10101 CurContext->addDecl(D); 10102 10103 return D; 10104} 10105 10106Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10107 MultiTemplateParamsArg TemplateParams) { 10108 const DeclSpec &DS = D.getDeclSpec(); 10109 10110 assert(DS.isFriendSpecified()); 10111 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10112 10113 SourceLocation Loc = D.getIdentifierLoc(); 10114 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10115 10116 // C++ [class.friend]p1 10117 // A friend of a class is a function or class.... 10118 // Note that this sees through typedefs, which is intended. 10119 // It *doesn't* see through dependent types, which is correct 10120 // according to [temp.arg.type]p3: 10121 // If a declaration acquires a function type through a 10122 // type dependent on a template-parameter and this causes 10123 // a declaration that does not use the syntactic form of a 10124 // function declarator to have a function type, the program 10125 // is ill-formed. 10126 if (!TInfo->getType()->isFunctionType()) { 10127 Diag(Loc, diag::err_unexpected_friend); 10128 10129 // It might be worthwhile to try to recover by creating an 10130 // appropriate declaration. 10131 return 0; 10132 } 10133 10134 // C++ [namespace.memdef]p3 10135 // - If a friend declaration in a non-local class first declares a 10136 // class or function, the friend class or function is a member 10137 // of the innermost enclosing namespace. 10138 // - The name of the friend is not found by simple name lookup 10139 // until a matching declaration is provided in that namespace 10140 // scope (either before or after the class declaration granting 10141 // friendship). 10142 // - If a friend function is called, its name may be found by the 10143 // name lookup that considers functions from namespaces and 10144 // classes associated with the types of the function arguments. 10145 // - When looking for a prior declaration of a class or a function 10146 // declared as a friend, scopes outside the innermost enclosing 10147 // namespace scope are not considered. 10148 10149 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10150 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10151 DeclarationName Name = NameInfo.getName(); 10152 assert(Name); 10153 10154 // Check for unexpanded parameter packs. 10155 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10156 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10157 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10158 return 0; 10159 10160 // The context we found the declaration in, or in which we should 10161 // create the declaration. 10162 DeclContext *DC; 10163 Scope *DCScope = S; 10164 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10165 ForRedeclaration); 10166 10167 // FIXME: there are different rules in local classes 10168 10169 // There are four cases here. 10170 // - There's no scope specifier, in which case we just go to the 10171 // appropriate scope and look for a function or function template 10172 // there as appropriate. 10173 // Recover from invalid scope qualifiers as if they just weren't there. 10174 if (SS.isInvalid() || !SS.isSet()) { 10175 // C++0x [namespace.memdef]p3: 10176 // If the name in a friend declaration is neither qualified nor 10177 // a template-id and the declaration is a function or an 10178 // elaborated-type-specifier, the lookup to determine whether 10179 // the entity has been previously declared shall not consider 10180 // any scopes outside the innermost enclosing namespace. 10181 // C++0x [class.friend]p11: 10182 // If a friend declaration appears in a local class and the name 10183 // specified is an unqualified name, a prior declaration is 10184 // looked up without considering scopes that are outside the 10185 // innermost enclosing non-class scope. For a friend function 10186 // declaration, if there is no prior declaration, the program is 10187 // ill-formed. 10188 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10189 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10190 10191 // Find the appropriate context according to the above. 10192 DC = CurContext; 10193 while (true) { 10194 // Skip class contexts. If someone can cite chapter and verse 10195 // for this behavior, that would be nice --- it's what GCC and 10196 // EDG do, and it seems like a reasonable intent, but the spec 10197 // really only says that checks for unqualified existing 10198 // declarations should stop at the nearest enclosing namespace, 10199 // not that they should only consider the nearest enclosing 10200 // namespace. 10201 while (DC->isRecord() || DC->isTransparentContext()) 10202 DC = DC->getParent(); 10203 10204 LookupQualifiedName(Previous, DC); 10205 10206 // TODO: decide what we think about using declarations. 10207 if (isLocal || !Previous.empty()) 10208 break; 10209 10210 if (isTemplateId) { 10211 if (isa<TranslationUnitDecl>(DC)) break; 10212 } else { 10213 if (DC->isFileContext()) break; 10214 } 10215 DC = DC->getParent(); 10216 } 10217 10218 // C++ [class.friend]p1: A friend of a class is a function or 10219 // class that is not a member of the class . . . 10220 // C++11 changes this for both friend types and functions. 10221 // Most C++ 98 compilers do seem to give an error here, so 10222 // we do, too. 10223 if (!Previous.empty() && DC->Equals(CurContext)) 10224 Diag(DS.getFriendSpecLoc(), 10225 getLangOpts().CPlusPlus0x ? 10226 diag::warn_cxx98_compat_friend_is_member : 10227 diag::err_friend_is_member); 10228 10229 DCScope = getScopeForDeclContext(S, DC); 10230 10231 // C++ [class.friend]p6: 10232 // A function can be defined in a friend declaration of a class if and 10233 // only if the class is a non-local class (9.8), the function name is 10234 // unqualified, and the function has namespace scope. 10235 if (isLocal && D.isFunctionDefinition()) { 10236 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10237 } 10238 10239 // - There's a non-dependent scope specifier, in which case we 10240 // compute it and do a previous lookup there for a function 10241 // or function template. 10242 } else if (!SS.getScopeRep()->isDependent()) { 10243 DC = computeDeclContext(SS); 10244 if (!DC) return 0; 10245 10246 if (RequireCompleteDeclContext(SS, DC)) return 0; 10247 10248 LookupQualifiedName(Previous, DC); 10249 10250 // Ignore things found implicitly in the wrong scope. 10251 // TODO: better diagnostics for this case. Suggesting the right 10252 // qualified scope would be nice... 10253 LookupResult::Filter F = Previous.makeFilter(); 10254 while (F.hasNext()) { 10255 NamedDecl *D = F.next(); 10256 if (!DC->InEnclosingNamespaceSetOf( 10257 D->getDeclContext()->getRedeclContext())) 10258 F.erase(); 10259 } 10260 F.done(); 10261 10262 if (Previous.empty()) { 10263 D.setInvalidType(); 10264 Diag(Loc, diag::err_qualified_friend_not_found) 10265 << Name << TInfo->getType(); 10266 return 0; 10267 } 10268 10269 // C++ [class.friend]p1: A friend of a class is a function or 10270 // class that is not a member of the class . . . 10271 if (DC->Equals(CurContext)) 10272 Diag(DS.getFriendSpecLoc(), 10273 getLangOpts().CPlusPlus0x ? 10274 diag::warn_cxx98_compat_friend_is_member : 10275 diag::err_friend_is_member); 10276 10277 if (D.isFunctionDefinition()) { 10278 // C++ [class.friend]p6: 10279 // A function can be defined in a friend declaration of a class if and 10280 // only if the class is a non-local class (9.8), the function name is 10281 // unqualified, and the function has namespace scope. 10282 SemaDiagnosticBuilder DB 10283 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10284 10285 DB << SS.getScopeRep(); 10286 if (DC->isFileContext()) 10287 DB << FixItHint::CreateRemoval(SS.getRange()); 10288 SS.clear(); 10289 } 10290 10291 // - There's a scope specifier that does not match any template 10292 // parameter lists, in which case we use some arbitrary context, 10293 // create a method or method template, and wait for instantiation. 10294 // - There's a scope specifier that does match some template 10295 // parameter lists, which we don't handle right now. 10296 } else { 10297 if (D.isFunctionDefinition()) { 10298 // C++ [class.friend]p6: 10299 // A function can be defined in a friend declaration of a class if and 10300 // only if the class is a non-local class (9.8), the function name is 10301 // unqualified, and the function has namespace scope. 10302 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10303 << SS.getScopeRep(); 10304 } 10305 10306 DC = CurContext; 10307 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10308 } 10309 10310 if (!DC->isRecord()) { 10311 // This implies that it has to be an operator or function. 10312 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10313 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10314 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10315 Diag(Loc, diag::err_introducing_special_friend) << 10316 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10317 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10318 return 0; 10319 } 10320 } 10321 10322 // FIXME: This is an egregious hack to cope with cases where the scope stack 10323 // does not contain the declaration context, i.e., in an out-of-line 10324 // definition of a class. 10325 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10326 if (!DCScope) { 10327 FakeDCScope.setEntity(DC); 10328 DCScope = &FakeDCScope; 10329 } 10330 10331 bool AddToScope = true; 10332 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10333 TemplateParams, AddToScope); 10334 if (!ND) return 0; 10335 10336 assert(ND->getDeclContext() == DC); 10337 assert(ND->getLexicalDeclContext() == CurContext); 10338 10339 // Add the function declaration to the appropriate lookup tables, 10340 // adjusting the redeclarations list as necessary. We don't 10341 // want to do this yet if the friending class is dependent. 10342 // 10343 // Also update the scope-based lookup if the target context's 10344 // lookup context is in lexical scope. 10345 if (!CurContext->isDependentContext()) { 10346 DC = DC->getRedeclContext(); 10347 DC->makeDeclVisibleInContext(ND); 10348 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10349 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10350 } 10351 10352 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10353 D.getIdentifierLoc(), ND, 10354 DS.getFriendSpecLoc()); 10355 FrD->setAccess(AS_public); 10356 CurContext->addDecl(FrD); 10357 10358 if (ND->isInvalidDecl()) { 10359 FrD->setInvalidDecl(); 10360 } else { 10361 if (DC->isRecord()) CheckFriendAccess(ND); 10362 10363 FunctionDecl *FD; 10364 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10365 FD = FTD->getTemplatedDecl(); 10366 else 10367 FD = cast<FunctionDecl>(ND); 10368 10369 // Mark templated-scope function declarations as unsupported. 10370 if (FD->getNumTemplateParameterLists()) 10371 FrD->setUnsupportedFriend(true); 10372 } 10373 10374 return ND; 10375} 10376 10377void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10378 AdjustDeclIfTemplate(Dcl); 10379 10380 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10381 if (!Fn) { 10382 Diag(DelLoc, diag::err_deleted_non_function); 10383 return; 10384 } 10385 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10386 // Don't consider the implicit declaration we generate for explicit 10387 // specializations. FIXME: Do not generate these implicit declarations. 10388 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10389 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10390 Diag(DelLoc, diag::err_deleted_decl_not_first); 10391 Diag(Prev->getLocation(), diag::note_previous_declaration); 10392 } 10393 // If the declaration wasn't the first, we delete the function anyway for 10394 // recovery. 10395 } 10396 Fn->setDeletedAsWritten(); 10397 10398 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10399 if (!MD) 10400 return; 10401 10402 // A deleted special member function is trivial if the corresponding 10403 // implicitly-declared function would have been. 10404 switch (getSpecialMember(MD)) { 10405 case CXXInvalid: 10406 break; 10407 case CXXDefaultConstructor: 10408 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10409 break; 10410 case CXXCopyConstructor: 10411 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10412 break; 10413 case CXXMoveConstructor: 10414 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10415 break; 10416 case CXXCopyAssignment: 10417 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10418 break; 10419 case CXXMoveAssignment: 10420 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10421 break; 10422 case CXXDestructor: 10423 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10424 break; 10425 } 10426} 10427 10428void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10429 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10430 10431 if (MD) { 10432 if (MD->getParent()->isDependentType()) { 10433 MD->setDefaulted(); 10434 MD->setExplicitlyDefaulted(); 10435 return; 10436 } 10437 10438 CXXSpecialMember Member = getSpecialMember(MD); 10439 if (Member == CXXInvalid) { 10440 Diag(DefaultLoc, diag::err_default_special_members); 10441 return; 10442 } 10443 10444 MD->setDefaulted(); 10445 MD->setExplicitlyDefaulted(); 10446 10447 // If this definition appears within the record, do the checking when 10448 // the record is complete. 10449 const FunctionDecl *Primary = MD; 10450 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10451 // Find the uninstantiated declaration that actually had the '= default' 10452 // on it. 10453 Pattern->isDefined(Primary); 10454 10455 if (Primary == Primary->getCanonicalDecl()) 10456 return; 10457 10458 CheckExplicitlyDefaultedSpecialMember(MD); 10459 10460 switch (Member) { 10461 case CXXDefaultConstructor: { 10462 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10463 if (!CD->isInvalidDecl()) 10464 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10465 break; 10466 } 10467 10468 case CXXCopyConstructor: { 10469 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10470 if (!CD->isInvalidDecl()) 10471 DefineImplicitCopyConstructor(DefaultLoc, CD); 10472 break; 10473 } 10474 10475 case CXXCopyAssignment: { 10476 if (!MD->isInvalidDecl()) 10477 DefineImplicitCopyAssignment(DefaultLoc, MD); 10478 break; 10479 } 10480 10481 case CXXDestructor: { 10482 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10483 if (!DD->isInvalidDecl()) 10484 DefineImplicitDestructor(DefaultLoc, DD); 10485 break; 10486 } 10487 10488 case CXXMoveConstructor: { 10489 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10490 if (!CD->isInvalidDecl()) 10491 DefineImplicitMoveConstructor(DefaultLoc, CD); 10492 break; 10493 } 10494 10495 case CXXMoveAssignment: { 10496 if (!MD->isInvalidDecl()) 10497 DefineImplicitMoveAssignment(DefaultLoc, MD); 10498 break; 10499 } 10500 10501 case CXXInvalid: 10502 llvm_unreachable("Invalid special member."); 10503 } 10504 } else { 10505 Diag(DefaultLoc, diag::err_default_special_members); 10506 } 10507} 10508 10509static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10510 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10511 Stmt *SubStmt = *CI; 10512 if (!SubStmt) 10513 continue; 10514 if (isa<ReturnStmt>(SubStmt)) 10515 Self.Diag(SubStmt->getLocStart(), 10516 diag::err_return_in_constructor_handler); 10517 if (!isa<Expr>(SubStmt)) 10518 SearchForReturnInStmt(Self, SubStmt); 10519 } 10520} 10521 10522void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10523 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10524 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10525 SearchForReturnInStmt(*this, Handler); 10526 } 10527} 10528 10529bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10530 const CXXMethodDecl *Old) { 10531 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10532 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10533 10534 if (Context.hasSameType(NewTy, OldTy) || 10535 NewTy->isDependentType() || OldTy->isDependentType()) 10536 return false; 10537 10538 // Check if the return types are covariant 10539 QualType NewClassTy, OldClassTy; 10540 10541 /// Both types must be pointers or references to classes. 10542 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10543 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10544 NewClassTy = NewPT->getPointeeType(); 10545 OldClassTy = OldPT->getPointeeType(); 10546 } 10547 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10548 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10549 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10550 NewClassTy = NewRT->getPointeeType(); 10551 OldClassTy = OldRT->getPointeeType(); 10552 } 10553 } 10554 } 10555 10556 // The return types aren't either both pointers or references to a class type. 10557 if (NewClassTy.isNull()) { 10558 Diag(New->getLocation(), 10559 diag::err_different_return_type_for_overriding_virtual_function) 10560 << New->getDeclName() << NewTy << OldTy; 10561 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10562 10563 return true; 10564 } 10565 10566 // C++ [class.virtual]p6: 10567 // If the return type of D::f differs from the return type of B::f, the 10568 // class type in the return type of D::f shall be complete at the point of 10569 // declaration of D::f or shall be the class type D. 10570 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10571 if (!RT->isBeingDefined() && 10572 RequireCompleteType(New->getLocation(), NewClassTy, 10573 diag::err_covariant_return_incomplete, 10574 New->getDeclName())) 10575 return true; 10576 } 10577 10578 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10579 // Check if the new class derives from the old class. 10580 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10581 Diag(New->getLocation(), 10582 diag::err_covariant_return_not_derived) 10583 << New->getDeclName() << NewTy << OldTy; 10584 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10585 return true; 10586 } 10587 10588 // Check if we the conversion from derived to base is valid. 10589 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10590 diag::err_covariant_return_inaccessible_base, 10591 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10592 // FIXME: Should this point to the return type? 10593 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10594 // FIXME: this note won't trigger for delayed access control 10595 // diagnostics, and it's impossible to get an undelayed error 10596 // here from access control during the original parse because 10597 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10598 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10599 return true; 10600 } 10601 } 10602 10603 // The qualifiers of the return types must be the same. 10604 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10605 Diag(New->getLocation(), 10606 diag::err_covariant_return_type_different_qualifications) 10607 << New->getDeclName() << NewTy << OldTy; 10608 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10609 return true; 10610 }; 10611 10612 10613 // The new class type must have the same or less qualifiers as the old type. 10614 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10615 Diag(New->getLocation(), 10616 diag::err_covariant_return_type_class_type_more_qualified) 10617 << New->getDeclName() << NewTy << OldTy; 10618 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10619 return true; 10620 }; 10621 10622 return false; 10623} 10624 10625/// \brief Mark the given method pure. 10626/// 10627/// \param Method the method to be marked pure. 10628/// 10629/// \param InitRange the source range that covers the "0" initializer. 10630bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10631 SourceLocation EndLoc = InitRange.getEnd(); 10632 if (EndLoc.isValid()) 10633 Method->setRangeEnd(EndLoc); 10634 10635 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10636 Method->setPure(); 10637 return false; 10638 } 10639 10640 if (!Method->isInvalidDecl()) 10641 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10642 << Method->getDeclName() << InitRange; 10643 return true; 10644} 10645 10646/// \brief Determine whether the given declaration is a static data member. 10647static bool isStaticDataMember(Decl *D) { 10648 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10649 if (!Var) 10650 return false; 10651 10652 return Var->isStaticDataMember(); 10653} 10654/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10655/// an initializer for the out-of-line declaration 'Dcl'. The scope 10656/// is a fresh scope pushed for just this purpose. 10657/// 10658/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10659/// static data member of class X, names should be looked up in the scope of 10660/// class X. 10661void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10662 // If there is no declaration, there was an error parsing it. 10663 if (D == 0 || D->isInvalidDecl()) return; 10664 10665 // We should only get called for declarations with scope specifiers, like: 10666 // int foo::bar; 10667 assert(D->isOutOfLine()); 10668 EnterDeclaratorContext(S, D->getDeclContext()); 10669 10670 // If we are parsing the initializer for a static data member, push a 10671 // new expression evaluation context that is associated with this static 10672 // data member. 10673 if (isStaticDataMember(D)) 10674 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10675} 10676 10677/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10678/// initializer for the out-of-line declaration 'D'. 10679void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10680 // If there is no declaration, there was an error parsing it. 10681 if (D == 0 || D->isInvalidDecl()) return; 10682 10683 if (isStaticDataMember(D)) 10684 PopExpressionEvaluationContext(); 10685 10686 assert(D->isOutOfLine()); 10687 ExitDeclaratorContext(S); 10688} 10689 10690/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10691/// C++ if/switch/while/for statement. 10692/// e.g: "if (int x = f()) {...}" 10693DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10694 // C++ 6.4p2: 10695 // The declarator shall not specify a function or an array. 10696 // The type-specifier-seq shall not contain typedef and shall not declare a 10697 // new class or enumeration. 10698 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10699 "Parser allowed 'typedef' as storage class of condition decl."); 10700 10701 Decl *Dcl = ActOnDeclarator(S, D); 10702 if (!Dcl) 10703 return true; 10704 10705 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10706 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10707 << D.getSourceRange(); 10708 return true; 10709 } 10710 10711 return Dcl; 10712} 10713 10714void Sema::LoadExternalVTableUses() { 10715 if (!ExternalSource) 10716 return; 10717 10718 SmallVector<ExternalVTableUse, 4> VTables; 10719 ExternalSource->ReadUsedVTables(VTables); 10720 SmallVector<VTableUse, 4> NewUses; 10721 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10722 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10723 = VTablesUsed.find(VTables[I].Record); 10724 // Even if a definition wasn't required before, it may be required now. 10725 if (Pos != VTablesUsed.end()) { 10726 if (!Pos->second && VTables[I].DefinitionRequired) 10727 Pos->second = true; 10728 continue; 10729 } 10730 10731 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10732 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10733 } 10734 10735 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10736} 10737 10738void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10739 bool DefinitionRequired) { 10740 // Ignore any vtable uses in unevaluated operands or for classes that do 10741 // not have a vtable. 10742 if (!Class->isDynamicClass() || Class->isDependentContext() || 10743 CurContext->isDependentContext() || 10744 ExprEvalContexts.back().Context == Unevaluated) 10745 return; 10746 10747 // Try to insert this class into the map. 10748 LoadExternalVTableUses(); 10749 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10750 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10751 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10752 if (!Pos.second) { 10753 // If we already had an entry, check to see if we are promoting this vtable 10754 // to required a definition. If so, we need to reappend to the VTableUses 10755 // list, since we may have already processed the first entry. 10756 if (DefinitionRequired && !Pos.first->second) { 10757 Pos.first->second = true; 10758 } else { 10759 // Otherwise, we can early exit. 10760 return; 10761 } 10762 } 10763 10764 // Local classes need to have their virtual members marked 10765 // immediately. For all other classes, we mark their virtual members 10766 // at the end of the translation unit. 10767 if (Class->isLocalClass()) 10768 MarkVirtualMembersReferenced(Loc, Class); 10769 else 10770 VTableUses.push_back(std::make_pair(Class, Loc)); 10771} 10772 10773bool Sema::DefineUsedVTables() { 10774 LoadExternalVTableUses(); 10775 if (VTableUses.empty()) 10776 return false; 10777 10778 // Note: The VTableUses vector could grow as a result of marking 10779 // the members of a class as "used", so we check the size each 10780 // time through the loop and prefer indices (which are stable) to 10781 // iterators (which are not). 10782 bool DefinedAnything = false; 10783 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10784 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10785 if (!Class) 10786 continue; 10787 10788 SourceLocation Loc = VTableUses[I].second; 10789 10790 bool DefineVTable = true; 10791 10792 // If this class has a key function, but that key function is 10793 // defined in another translation unit, we don't need to emit the 10794 // vtable even though we're using it. 10795 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10796 if (KeyFunction && !KeyFunction->hasBody()) { 10797 switch (KeyFunction->getTemplateSpecializationKind()) { 10798 case TSK_Undeclared: 10799 case TSK_ExplicitSpecialization: 10800 case TSK_ExplicitInstantiationDeclaration: 10801 // The key function is in another translation unit. 10802 DefineVTable = false; 10803 break; 10804 10805 case TSK_ExplicitInstantiationDefinition: 10806 case TSK_ImplicitInstantiation: 10807 // We will be instantiating the key function. 10808 break; 10809 } 10810 } else if (!KeyFunction) { 10811 // If we have a class with no key function that is the subject 10812 // of an explicit instantiation declaration, suppress the 10813 // vtable; it will live with the explicit instantiation 10814 // definition. 10815 bool IsExplicitInstantiationDeclaration 10816 = Class->getTemplateSpecializationKind() 10817 == TSK_ExplicitInstantiationDeclaration; 10818 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10819 REnd = Class->redecls_end(); 10820 R != REnd; ++R) { 10821 TemplateSpecializationKind TSK 10822 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10823 if (TSK == TSK_ExplicitInstantiationDeclaration) 10824 IsExplicitInstantiationDeclaration = true; 10825 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10826 IsExplicitInstantiationDeclaration = false; 10827 break; 10828 } 10829 } 10830 10831 if (IsExplicitInstantiationDeclaration) 10832 DefineVTable = false; 10833 } 10834 10835 // The exception specifications for all virtual members may be needed even 10836 // if we are not providing an authoritative form of the vtable in this TU. 10837 // We may choose to emit it available_externally anyway. 10838 if (!DefineVTable) { 10839 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10840 continue; 10841 } 10842 10843 // Mark all of the virtual members of this class as referenced, so 10844 // that we can build a vtable. Then, tell the AST consumer that a 10845 // vtable for this class is required. 10846 DefinedAnything = true; 10847 MarkVirtualMembersReferenced(Loc, Class); 10848 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10849 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10850 10851 // Optionally warn if we're emitting a weak vtable. 10852 if (Class->getLinkage() == ExternalLinkage && 10853 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10854 const FunctionDecl *KeyFunctionDef = 0; 10855 if (!KeyFunction || 10856 (KeyFunction->hasBody(KeyFunctionDef) && 10857 KeyFunctionDef->isInlined())) 10858 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10859 TSK_ExplicitInstantiationDefinition 10860 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10861 << Class; 10862 } 10863 } 10864 VTableUses.clear(); 10865 10866 return DefinedAnything; 10867} 10868 10869void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10870 const CXXRecordDecl *RD) { 10871 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10872 E = RD->method_end(); I != E; ++I) 10873 if ((*I)->isVirtual() && !(*I)->isPure()) 10874 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10875} 10876 10877void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10878 const CXXRecordDecl *RD) { 10879 // Mark all functions which will appear in RD's vtable as used. 10880 CXXFinalOverriderMap FinalOverriders; 10881 RD->getFinalOverriders(FinalOverriders); 10882 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10883 E = FinalOverriders.end(); 10884 I != E; ++I) { 10885 for (OverridingMethods::const_iterator OI = I->second.begin(), 10886 OE = I->second.end(); 10887 OI != OE; ++OI) { 10888 assert(OI->second.size() > 0 && "no final overrider"); 10889 CXXMethodDecl *Overrider = OI->second.front().Method; 10890 10891 // C++ [basic.def.odr]p2: 10892 // [...] A virtual member function is used if it is not pure. [...] 10893 if (!Overrider->isPure()) 10894 MarkFunctionReferenced(Loc, Overrider); 10895 } 10896 } 10897 10898 // Only classes that have virtual bases need a VTT. 10899 if (RD->getNumVBases() == 0) 10900 return; 10901 10902 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10903 e = RD->bases_end(); i != e; ++i) { 10904 const CXXRecordDecl *Base = 10905 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10906 if (Base->getNumVBases() == 0) 10907 continue; 10908 MarkVirtualMembersReferenced(Loc, Base); 10909 } 10910} 10911 10912/// SetIvarInitializers - This routine builds initialization ASTs for the 10913/// Objective-C implementation whose ivars need be initialized. 10914void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10915 if (!getLangOpts().CPlusPlus) 10916 return; 10917 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10918 SmallVector<ObjCIvarDecl*, 8> ivars; 10919 CollectIvarsToConstructOrDestruct(OID, ivars); 10920 if (ivars.empty()) 10921 return; 10922 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10923 for (unsigned i = 0; i < ivars.size(); i++) { 10924 FieldDecl *Field = ivars[i]; 10925 if (Field->isInvalidDecl()) 10926 continue; 10927 10928 CXXCtorInitializer *Member; 10929 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10930 InitializationKind InitKind = 10931 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10932 10933 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10934 ExprResult MemberInit = 10935 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10936 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10937 // Note, MemberInit could actually come back empty if no initialization 10938 // is required (e.g., because it would call a trivial default constructor) 10939 if (!MemberInit.get() || MemberInit.isInvalid()) 10940 continue; 10941 10942 Member = 10943 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10944 SourceLocation(), 10945 MemberInit.takeAs<Expr>(), 10946 SourceLocation()); 10947 AllToInit.push_back(Member); 10948 10949 // Be sure that the destructor is accessible and is marked as referenced. 10950 if (const RecordType *RecordTy 10951 = Context.getBaseElementType(Field->getType()) 10952 ->getAs<RecordType>()) { 10953 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10954 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10955 MarkFunctionReferenced(Field->getLocation(), Destructor); 10956 CheckDestructorAccess(Field->getLocation(), Destructor, 10957 PDiag(diag::err_access_dtor_ivar) 10958 << Context.getBaseElementType(Field->getType())); 10959 } 10960 } 10961 } 10962 ObjCImplementation->setIvarInitializers(Context, 10963 AllToInit.data(), AllToInit.size()); 10964 } 10965} 10966 10967static 10968void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10969 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10970 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10971 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10972 Sema &S) { 10973 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10974 CE = Current.end(); 10975 if (Ctor->isInvalidDecl()) 10976 return; 10977 10978 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 10979 10980 // Target may not be determinable yet, for instance if this is a dependent 10981 // call in an uninstantiated template. 10982 if (Target) { 10983 const FunctionDecl *FNTarget = 0; 10984 (void)Target->hasBody(FNTarget); 10985 Target = const_cast<CXXConstructorDecl*>( 10986 cast_or_null<CXXConstructorDecl>(FNTarget)); 10987 } 10988 10989 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10990 // Avoid dereferencing a null pointer here. 10991 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10992 10993 if (!Current.insert(Canonical)) 10994 return; 10995 10996 // We know that beyond here, we aren't chaining into a cycle. 10997 if (!Target || !Target->isDelegatingConstructor() || 10998 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10999 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11000 Valid.insert(*CI); 11001 Current.clear(); 11002 // We've hit a cycle. 11003 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11004 Current.count(TCanonical)) { 11005 // If we haven't diagnosed this cycle yet, do so now. 11006 if (!Invalid.count(TCanonical)) { 11007 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11008 diag::warn_delegating_ctor_cycle) 11009 << Ctor; 11010 11011 // Don't add a note for a function delegating directly to itself. 11012 if (TCanonical != Canonical) 11013 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11014 11015 CXXConstructorDecl *C = Target; 11016 while (C->getCanonicalDecl() != Canonical) { 11017 const FunctionDecl *FNTarget = 0; 11018 (void)C->getTargetConstructor()->hasBody(FNTarget); 11019 assert(FNTarget && "Ctor cycle through bodiless function"); 11020 11021 C = const_cast<CXXConstructorDecl*>( 11022 cast<CXXConstructorDecl>(FNTarget)); 11023 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11024 } 11025 } 11026 11027 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11028 Invalid.insert(*CI); 11029 Current.clear(); 11030 } else { 11031 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11032 } 11033} 11034 11035 11036void Sema::CheckDelegatingCtorCycles() { 11037 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11038 11039 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11040 CE = Current.end(); 11041 11042 for (DelegatingCtorDeclsType::iterator 11043 I = DelegatingCtorDecls.begin(ExternalSource), 11044 E = DelegatingCtorDecls.end(); 11045 I != E; ++I) 11046 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11047 11048 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11049 (*CI)->setInvalidDecl(); 11050} 11051 11052namespace { 11053 /// \brief AST visitor that finds references to the 'this' expression. 11054 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11055 Sema &S; 11056 11057 public: 11058 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11059 11060 bool VisitCXXThisExpr(CXXThisExpr *E) { 11061 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11062 << E->isImplicit(); 11063 return false; 11064 } 11065 }; 11066} 11067 11068bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11069 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11070 if (!TSInfo) 11071 return false; 11072 11073 TypeLoc TL = TSInfo->getTypeLoc(); 11074 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11075 if (!ProtoTL) 11076 return false; 11077 11078 // C++11 [expr.prim.general]p3: 11079 // [The expression this] shall not appear before the optional 11080 // cv-qualifier-seq and it shall not appear within the declaration of a 11081 // static member function (although its type and value category are defined 11082 // within a static member function as they are within a non-static member 11083 // function). [ Note: this is because declaration matching does not occur 11084 // until the complete declarator is known. - end note ] 11085 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11086 FindCXXThisExpr Finder(*this); 11087 11088 // If the return type came after the cv-qualifier-seq, check it now. 11089 if (Proto->hasTrailingReturn() && 11090 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11091 return true; 11092 11093 // Check the exception specification. 11094 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11095 return true; 11096 11097 return checkThisInStaticMemberFunctionAttributes(Method); 11098} 11099 11100bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11101 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11102 if (!TSInfo) 11103 return false; 11104 11105 TypeLoc TL = TSInfo->getTypeLoc(); 11106 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11107 if (!ProtoTL) 11108 return false; 11109 11110 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11111 FindCXXThisExpr Finder(*this); 11112 11113 switch (Proto->getExceptionSpecType()) { 11114 case EST_Uninstantiated: 11115 case EST_Unevaluated: 11116 case EST_BasicNoexcept: 11117 case EST_DynamicNone: 11118 case EST_MSAny: 11119 case EST_None: 11120 break; 11121 11122 case EST_ComputedNoexcept: 11123 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11124 return true; 11125 11126 case EST_Dynamic: 11127 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11128 EEnd = Proto->exception_end(); 11129 E != EEnd; ++E) { 11130 if (!Finder.TraverseType(*E)) 11131 return true; 11132 } 11133 break; 11134 } 11135 11136 return false; 11137} 11138 11139bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11140 FindCXXThisExpr Finder(*this); 11141 11142 // Check attributes. 11143 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11144 A != AEnd; ++A) { 11145 // FIXME: This should be emitted by tblgen. 11146 Expr *Arg = 0; 11147 ArrayRef<Expr *> Args; 11148 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11149 Arg = G->getArg(); 11150 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11151 Arg = G->getArg(); 11152 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11153 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11154 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11155 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11156 else if (ExclusiveLockFunctionAttr *ELF 11157 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11158 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11159 else if (SharedLockFunctionAttr *SLF 11160 = dyn_cast<SharedLockFunctionAttr>(*A)) 11161 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11162 else if (ExclusiveTrylockFunctionAttr *ETLF 11163 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11164 Arg = ETLF->getSuccessValue(); 11165 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11166 } else if (SharedTrylockFunctionAttr *STLF 11167 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11168 Arg = STLF->getSuccessValue(); 11169 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11170 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11171 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11172 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11173 Arg = LR->getArg(); 11174 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11175 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11176 else if (ExclusiveLocksRequiredAttr *ELR 11177 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11178 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11179 else if (SharedLocksRequiredAttr *SLR 11180 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11181 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11182 11183 if (Arg && !Finder.TraverseStmt(Arg)) 11184 return true; 11185 11186 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11187 if (!Finder.TraverseStmt(Args[I])) 11188 return true; 11189 } 11190 } 11191 11192 return false; 11193} 11194 11195void 11196Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11197 ArrayRef<ParsedType> DynamicExceptions, 11198 ArrayRef<SourceRange> DynamicExceptionRanges, 11199 Expr *NoexceptExpr, 11200 llvm::SmallVectorImpl<QualType> &Exceptions, 11201 FunctionProtoType::ExtProtoInfo &EPI) { 11202 Exceptions.clear(); 11203 EPI.ExceptionSpecType = EST; 11204 if (EST == EST_Dynamic) { 11205 Exceptions.reserve(DynamicExceptions.size()); 11206 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11207 // FIXME: Preserve type source info. 11208 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11209 11210 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11211 collectUnexpandedParameterPacks(ET, Unexpanded); 11212 if (!Unexpanded.empty()) { 11213 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11214 UPPC_ExceptionType, 11215 Unexpanded); 11216 continue; 11217 } 11218 11219 // Check that the type is valid for an exception spec, and 11220 // drop it if not. 11221 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11222 Exceptions.push_back(ET); 11223 } 11224 EPI.NumExceptions = Exceptions.size(); 11225 EPI.Exceptions = Exceptions.data(); 11226 return; 11227 } 11228 11229 if (EST == EST_ComputedNoexcept) { 11230 // If an error occurred, there's no expression here. 11231 if (NoexceptExpr) { 11232 assert((NoexceptExpr->isTypeDependent() || 11233 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11234 Context.BoolTy) && 11235 "Parser should have made sure that the expression is boolean"); 11236 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11237 EPI.ExceptionSpecType = EST_BasicNoexcept; 11238 return; 11239 } 11240 11241 if (!NoexceptExpr->isValueDependent()) 11242 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11243 diag::err_noexcept_needs_constant_expression, 11244 /*AllowFold*/ false).take(); 11245 EPI.NoexceptExpr = NoexceptExpr; 11246 } 11247 return; 11248 } 11249} 11250 11251/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11252Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11253 // Implicitly declared functions (e.g. copy constructors) are 11254 // __host__ __device__ 11255 if (D->isImplicit()) 11256 return CFT_HostDevice; 11257 11258 if (D->hasAttr<CUDAGlobalAttr>()) 11259 return CFT_Global; 11260 11261 if (D->hasAttr<CUDADeviceAttr>()) { 11262 if (D->hasAttr<CUDAHostAttr>()) 11263 return CFT_HostDevice; 11264 else 11265 return CFT_Device; 11266 } 11267 11268 return CFT_Host; 11269} 11270 11271bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11272 CUDAFunctionTarget CalleeTarget) { 11273 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11274 // Callable from the device only." 11275 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11276 return true; 11277 11278 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11279 // Callable from the host only." 11280 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11281 // Callable from the host only." 11282 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11283 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11284 return true; 11285 11286 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11287 return true; 11288 11289 return false; 11290} 11291