SemaDeclCXX.cpp revision 9a30c9946e898e595eb71f23dc9a60303428998b
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().Microsoft) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 if (CheckEquivalentExceptionSpec(Old, New)) 506 Invalid = true; 507 508 return Invalid; 509} 510 511/// \brief Merge the exception specifications of two variable declarations. 512/// 513/// This is called when there's a redeclaration of a VarDecl. The function 514/// checks if the redeclaration might have an exception specification and 515/// validates compatibility and merges the specs if necessary. 516void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 517 // Shortcut if exceptions are disabled. 518 if (!getLangOptions().CXXExceptions) 519 return; 520 521 assert(Context.hasSameType(New->getType(), Old->getType()) && 522 "Should only be called if types are otherwise the same."); 523 524 QualType NewType = New->getType(); 525 QualType OldType = Old->getType(); 526 527 // We're only interested in pointers and references to functions, as well 528 // as pointers to member functions. 529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 530 NewType = R->getPointeeType(); 531 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 532 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 533 NewType = P->getPointeeType(); 534 OldType = OldType->getAs<PointerType>()->getPointeeType(); 535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 536 NewType = M->getPointeeType(); 537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 538 } 539 540 if (!NewType->isFunctionProtoType()) 541 return; 542 543 // There's lots of special cases for functions. For function pointers, system 544 // libraries are hopefully not as broken so that we don't need these 545 // workarounds. 546 if (CheckEquivalentExceptionSpec( 547 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 548 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 549 New->setInvalidDecl(); 550 } 551} 552 553/// CheckCXXDefaultArguments - Verify that the default arguments for a 554/// function declaration are well-formed according to C++ 555/// [dcl.fct.default]. 556void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 557 unsigned NumParams = FD->getNumParams(); 558 unsigned p; 559 560 // Find first parameter with a default argument 561 for (p = 0; p < NumParams; ++p) { 562 ParmVarDecl *Param = FD->getParamDecl(p); 563 if (Param->hasDefaultArg()) 564 break; 565 } 566 567 // C++ [dcl.fct.default]p4: 568 // In a given function declaration, all parameters 569 // subsequent to a parameter with a default argument shall 570 // have default arguments supplied in this or previous 571 // declarations. A default argument shall not be redefined 572 // by a later declaration (not even to the same value). 573 unsigned LastMissingDefaultArg = 0; 574 for (; p < NumParams; ++p) { 575 ParmVarDecl *Param = FD->getParamDecl(p); 576 if (!Param->hasDefaultArg()) { 577 if (Param->isInvalidDecl()) 578 /* We already complained about this parameter. */; 579 else if (Param->getIdentifier()) 580 Diag(Param->getLocation(), 581 diag::err_param_default_argument_missing_name) 582 << Param->getIdentifier(); 583 else 584 Diag(Param->getLocation(), 585 diag::err_param_default_argument_missing); 586 587 LastMissingDefaultArg = p; 588 } 589 } 590 591 if (LastMissingDefaultArg > 0) { 592 // Some default arguments were missing. Clear out all of the 593 // default arguments up to (and including) the last missing 594 // default argument, so that we leave the function parameters 595 // in a semantically valid state. 596 for (p = 0; p <= LastMissingDefaultArg; ++p) { 597 ParmVarDecl *Param = FD->getParamDecl(p); 598 if (Param->hasDefaultArg()) { 599 Param->setDefaultArg(0); 600 } 601 } 602 } 603} 604 605/// isCurrentClassName - Determine whether the identifier II is the 606/// name of the class type currently being defined. In the case of 607/// nested classes, this will only return true if II is the name of 608/// the innermost class. 609bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 610 const CXXScopeSpec *SS) { 611 assert(getLangOptions().CPlusPlus && "No class names in C!"); 612 613 CXXRecordDecl *CurDecl; 614 if (SS && SS->isSet() && !SS->isInvalid()) { 615 DeclContext *DC = computeDeclContext(*SS, true); 616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 617 } else 618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 619 620 if (CurDecl && CurDecl->getIdentifier()) 621 return &II == CurDecl->getIdentifier(); 622 else 623 return false; 624} 625 626/// \brief Check the validity of a C++ base class specifier. 627/// 628/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 629/// and returns NULL otherwise. 630CXXBaseSpecifier * 631Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 632 SourceRange SpecifierRange, 633 bool Virtual, AccessSpecifier Access, 634 TypeSourceInfo *TInfo, 635 SourceLocation EllipsisLoc) { 636 QualType BaseType = TInfo->getType(); 637 638 // C++ [class.union]p1: 639 // A union shall not have base classes. 640 if (Class->isUnion()) { 641 Diag(Class->getLocation(), diag::err_base_clause_on_union) 642 << SpecifierRange; 643 return 0; 644 } 645 646 if (EllipsisLoc.isValid() && 647 !TInfo->getType()->containsUnexpandedParameterPack()) { 648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 649 << TInfo->getTypeLoc().getSourceRange(); 650 EllipsisLoc = SourceLocation(); 651 } 652 653 if (BaseType->isDependentType()) 654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 655 Class->getTagKind() == TTK_Class, 656 Access, TInfo, EllipsisLoc); 657 658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 659 660 // Base specifiers must be record types. 661 if (!BaseType->isRecordType()) { 662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 663 return 0; 664 } 665 666 // C++ [class.union]p1: 667 // A union shall not be used as a base class. 668 if (BaseType->isUnionType()) { 669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 670 return 0; 671 } 672 673 // C++ [class.derived]p2: 674 // The class-name in a base-specifier shall not be an incompletely 675 // defined class. 676 if (RequireCompleteType(BaseLoc, BaseType, 677 PDiag(diag::err_incomplete_base_class) 678 << SpecifierRange)) { 679 Class->setInvalidDecl(); 680 return 0; 681 } 682 683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 685 assert(BaseDecl && "Record type has no declaration"); 686 BaseDecl = BaseDecl->getDefinition(); 687 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 689 assert(CXXBaseDecl && "Base type is not a C++ type"); 690 691 // C++ [class]p3: 692 // If a class is marked final and it appears as a base-type-specifier in 693 // base-clause, the program is ill-formed. 694 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 696 << CXXBaseDecl->getDeclName(); 697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 698 << CXXBaseDecl->getDeclName(); 699 return 0; 700 } 701 702 if (BaseDecl->isInvalidDecl()) 703 Class->setInvalidDecl(); 704 705 // Create the base specifier. 706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 707 Class->getTagKind() == TTK_Class, 708 Access, TInfo, EllipsisLoc); 709} 710 711/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 712/// one entry in the base class list of a class specifier, for 713/// example: 714/// class foo : public bar, virtual private baz { 715/// 'public bar' and 'virtual private baz' are each base-specifiers. 716BaseResult 717Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 718 bool Virtual, AccessSpecifier Access, 719 ParsedType basetype, SourceLocation BaseLoc, 720 SourceLocation EllipsisLoc) { 721 if (!classdecl) 722 return true; 723 724 AdjustDeclIfTemplate(classdecl); 725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 726 if (!Class) 727 return true; 728 729 TypeSourceInfo *TInfo = 0; 730 GetTypeFromParser(basetype, &TInfo); 731 732 if (EllipsisLoc.isInvalid() && 733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 734 UPPC_BaseType)) 735 return true; 736 737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 738 Virtual, Access, TInfo, 739 EllipsisLoc)) 740 return BaseSpec; 741 742 return true; 743} 744 745/// \brief Performs the actual work of attaching the given base class 746/// specifiers to a C++ class. 747bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 748 unsigned NumBases) { 749 if (NumBases == 0) 750 return false; 751 752 // Used to keep track of which base types we have already seen, so 753 // that we can properly diagnose redundant direct base types. Note 754 // that the key is always the unqualified canonical type of the base 755 // class. 756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 757 758 // Copy non-redundant base specifiers into permanent storage. 759 unsigned NumGoodBases = 0; 760 bool Invalid = false; 761 for (unsigned idx = 0; idx < NumBases; ++idx) { 762 QualType NewBaseType 763 = Context.getCanonicalType(Bases[idx]->getType()); 764 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 765 if (KnownBaseTypes[NewBaseType]) { 766 // C++ [class.mi]p3: 767 // A class shall not be specified as a direct base class of a 768 // derived class more than once. 769 Diag(Bases[idx]->getSourceRange().getBegin(), 770 diag::err_duplicate_base_class) 771 << KnownBaseTypes[NewBaseType]->getType() 772 << Bases[idx]->getSourceRange(); 773 774 // Delete the duplicate base class specifier; we're going to 775 // overwrite its pointer later. 776 Context.Deallocate(Bases[idx]); 777 778 Invalid = true; 779 } else { 780 // Okay, add this new base class. 781 KnownBaseTypes[NewBaseType] = Bases[idx]; 782 Bases[NumGoodBases++] = Bases[idx]; 783 } 784 } 785 786 // Attach the remaining base class specifiers to the derived class. 787 Class->setBases(Bases, NumGoodBases); 788 789 // Delete the remaining (good) base class specifiers, since their 790 // data has been copied into the CXXRecordDecl. 791 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 792 Context.Deallocate(Bases[idx]); 793 794 return Invalid; 795} 796 797/// ActOnBaseSpecifiers - Attach the given base specifiers to the 798/// class, after checking whether there are any duplicate base 799/// classes. 800void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 801 unsigned NumBases) { 802 if (!ClassDecl || !Bases || !NumBases) 803 return; 804 805 AdjustDeclIfTemplate(ClassDecl); 806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 807 (CXXBaseSpecifier**)(Bases), NumBases); 808} 809 810static CXXRecordDecl *GetClassForType(QualType T) { 811 if (const RecordType *RT = T->getAs<RecordType>()) 812 return cast<CXXRecordDecl>(RT->getDecl()); 813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 814 return ICT->getDecl(); 815 else 816 return 0; 817} 818 819/// \brief Determine whether the type \p Derived is a C++ class that is 820/// derived from the type \p Base. 821bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 822 if (!getLangOptions().CPlusPlus) 823 return false; 824 825 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 826 if (!DerivedRD) 827 return false; 828 829 CXXRecordDecl *BaseRD = GetClassForType(Base); 830 if (!BaseRD) 831 return false; 832 833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 835} 836 837/// \brief Determine whether the type \p Derived is a C++ class that is 838/// derived from the type \p Base. 839bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 840 if (!getLangOptions().CPlusPlus) 841 return false; 842 843 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 844 if (!DerivedRD) 845 return false; 846 847 CXXRecordDecl *BaseRD = GetClassForType(Base); 848 if (!BaseRD) 849 return false; 850 851 return DerivedRD->isDerivedFrom(BaseRD, Paths); 852} 853 854void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 855 CXXCastPath &BasePathArray) { 856 assert(BasePathArray.empty() && "Base path array must be empty!"); 857 assert(Paths.isRecordingPaths() && "Must record paths!"); 858 859 const CXXBasePath &Path = Paths.front(); 860 861 // We first go backward and check if we have a virtual base. 862 // FIXME: It would be better if CXXBasePath had the base specifier for 863 // the nearest virtual base. 864 unsigned Start = 0; 865 for (unsigned I = Path.size(); I != 0; --I) { 866 if (Path[I - 1].Base->isVirtual()) { 867 Start = I - 1; 868 break; 869 } 870 } 871 872 // Now add all bases. 873 for (unsigned I = Start, E = Path.size(); I != E; ++I) 874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 875} 876 877/// \brief Determine whether the given base path includes a virtual 878/// base class. 879bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 880 for (CXXCastPath::const_iterator B = BasePath.begin(), 881 BEnd = BasePath.end(); 882 B != BEnd; ++B) 883 if ((*B)->isVirtual()) 884 return true; 885 886 return false; 887} 888 889/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 890/// conversion (where Derived and Base are class types) is 891/// well-formed, meaning that the conversion is unambiguous (and 892/// that all of the base classes are accessible). Returns true 893/// and emits a diagnostic if the code is ill-formed, returns false 894/// otherwise. Loc is the location where this routine should point to 895/// if there is an error, and Range is the source range to highlight 896/// if there is an error. 897bool 898Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 899 unsigned InaccessibleBaseID, 900 unsigned AmbigiousBaseConvID, 901 SourceLocation Loc, SourceRange Range, 902 DeclarationName Name, 903 CXXCastPath *BasePath) { 904 // First, determine whether the path from Derived to Base is 905 // ambiguous. This is slightly more expensive than checking whether 906 // the Derived to Base conversion exists, because here we need to 907 // explore multiple paths to determine if there is an ambiguity. 908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 909 /*DetectVirtual=*/false); 910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 911 assert(DerivationOkay && 912 "Can only be used with a derived-to-base conversion"); 913 (void)DerivationOkay; 914 915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 916 if (InaccessibleBaseID) { 917 // Check that the base class can be accessed. 918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 919 InaccessibleBaseID)) { 920 case AR_inaccessible: 921 return true; 922 case AR_accessible: 923 case AR_dependent: 924 case AR_delayed: 925 break; 926 } 927 } 928 929 // Build a base path if necessary. 930 if (BasePath) 931 BuildBasePathArray(Paths, *BasePath); 932 return false; 933 } 934 935 // We know that the derived-to-base conversion is ambiguous, and 936 // we're going to produce a diagnostic. Perform the derived-to-base 937 // search just one more time to compute all of the possible paths so 938 // that we can print them out. This is more expensive than any of 939 // the previous derived-to-base checks we've done, but at this point 940 // performance isn't as much of an issue. 941 Paths.clear(); 942 Paths.setRecordingPaths(true); 943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 944 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 945 (void)StillOkay; 946 947 // Build up a textual representation of the ambiguous paths, e.g., 948 // D -> B -> A, that will be used to illustrate the ambiguous 949 // conversions in the diagnostic. We only print one of the paths 950 // to each base class subobject. 951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 952 953 Diag(Loc, AmbigiousBaseConvID) 954 << Derived << Base << PathDisplayStr << Range << Name; 955 return true; 956} 957 958bool 959Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 960 SourceLocation Loc, SourceRange Range, 961 CXXCastPath *BasePath, 962 bool IgnoreAccess) { 963 return CheckDerivedToBaseConversion(Derived, Base, 964 IgnoreAccess ? 0 965 : diag::err_upcast_to_inaccessible_base, 966 diag::err_ambiguous_derived_to_base_conv, 967 Loc, Range, DeclarationName(), 968 BasePath); 969} 970 971 972/// @brief Builds a string representing ambiguous paths from a 973/// specific derived class to different subobjects of the same base 974/// class. 975/// 976/// This function builds a string that can be used in error messages 977/// to show the different paths that one can take through the 978/// inheritance hierarchy to go from the derived class to different 979/// subobjects of a base class. The result looks something like this: 980/// @code 981/// struct D -> struct B -> struct A 982/// struct D -> struct C -> struct A 983/// @endcode 984std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 985 std::string PathDisplayStr; 986 std::set<unsigned> DisplayedPaths; 987 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 988 Path != Paths.end(); ++Path) { 989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 990 // We haven't displayed a path to this particular base 991 // class subobject yet. 992 PathDisplayStr += "\n "; 993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 994 for (CXXBasePath::const_iterator Element = Path->begin(); 995 Element != Path->end(); ++Element) 996 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 997 } 998 } 999 1000 return PathDisplayStr; 1001} 1002 1003//===----------------------------------------------------------------------===// 1004// C++ class member Handling 1005//===----------------------------------------------------------------------===// 1006 1007/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1008Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1009 SourceLocation ASLoc, 1010 SourceLocation ColonLoc) { 1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1013 ASLoc, ColonLoc); 1014 CurContext->addHiddenDecl(ASDecl); 1015 return ASDecl; 1016} 1017 1018/// CheckOverrideControl - Check C++0x override control semantics. 1019void Sema::CheckOverrideControl(const Decl *D) { 1020 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 1021 if (!MD || !MD->isVirtual()) 1022 return; 1023 1024 if (MD->isDependentContext()) 1025 return; 1026 1027 // C++0x [class.virtual]p3: 1028 // If a virtual function is marked with the virt-specifier override and does 1029 // not override a member function of a base class, 1030 // the program is ill-formed. 1031 bool HasOverriddenMethods = 1032 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1034 Diag(MD->getLocation(), 1035 diag::err_function_marked_override_not_overriding) 1036 << MD->getDeclName(); 1037 return; 1038 } 1039} 1040 1041/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1042/// function overrides a virtual member function marked 'final', according to 1043/// C++0x [class.virtual]p3. 1044bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1045 const CXXMethodDecl *Old) { 1046 if (!Old->hasAttr<FinalAttr>()) 1047 return false; 1048 1049 Diag(New->getLocation(), diag::err_final_function_overridden) 1050 << New->getDeclName(); 1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1052 return true; 1053} 1054 1055/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1056/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1057/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1058/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1059/// present but parsing it has been deferred. 1060Decl * 1061Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1062 MultiTemplateParamsArg TemplateParameterLists, 1063 ExprTy *BW, const VirtSpecifiers &VS, 1064 ExprTy *InitExpr, bool HasDeferredInit, 1065 bool IsDefinition) { 1066 const DeclSpec &DS = D.getDeclSpec(); 1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1068 DeclarationName Name = NameInfo.getName(); 1069 SourceLocation Loc = NameInfo.getLoc(); 1070 1071 // For anonymous bitfields, the location should point to the type. 1072 if (Loc.isInvalid()) 1073 Loc = D.getSourceRange().getBegin(); 1074 1075 Expr *BitWidth = static_cast<Expr*>(BW); 1076 Expr *Init = static_cast<Expr*>(InitExpr); 1077 1078 assert(isa<CXXRecordDecl>(CurContext)); 1079 assert(!DS.isFriendSpecified()); 1080 assert(!Init || !HasDeferredInit); 1081 1082 bool isFunc = D.isDeclarationOfFunction(); 1083 1084 // C++ 9.2p6: A member shall not be declared to have automatic storage 1085 // duration (auto, register) or with the extern storage-class-specifier. 1086 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1087 // data members and cannot be applied to names declared const or static, 1088 // and cannot be applied to reference members. 1089 switch (DS.getStorageClassSpec()) { 1090 case DeclSpec::SCS_unspecified: 1091 case DeclSpec::SCS_typedef: 1092 case DeclSpec::SCS_static: 1093 // FALL THROUGH. 1094 break; 1095 case DeclSpec::SCS_mutable: 1096 if (isFunc) { 1097 if (DS.getStorageClassSpecLoc().isValid()) 1098 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1099 else 1100 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1101 1102 // FIXME: It would be nicer if the keyword was ignored only for this 1103 // declarator. Otherwise we could get follow-up errors. 1104 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1105 } 1106 break; 1107 default: 1108 if (DS.getStorageClassSpecLoc().isValid()) 1109 Diag(DS.getStorageClassSpecLoc(), 1110 diag::err_storageclass_invalid_for_member); 1111 else 1112 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1113 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1114 } 1115 1116 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1117 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1118 !isFunc); 1119 1120 Decl *Member; 1121 if (isInstField) { 1122 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1123 1124 if (SS.isSet() && !SS.isInvalid()) { 1125 // The user provided a superfluous scope specifier inside a class 1126 // definition: 1127 // 1128 // class X { 1129 // int X::member; 1130 // }; 1131 DeclContext *DC = 0; 1132 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1133 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1134 << Name << FixItHint::CreateRemoval(SS.getRange()); 1135 else 1136 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1137 << Name << SS.getRange(); 1138 1139 SS.clear(); 1140 } 1141 1142 // FIXME: Check for template parameters! 1143 // FIXME: Check that the name is an identifier! 1144 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1145 HasDeferredInit, AS); 1146 assert(Member && "HandleField never returns null"); 1147 } else { 1148 assert(!HasDeferredInit); 1149 1150 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1151 if (!Member) { 1152 return 0; 1153 } 1154 1155 // Non-instance-fields can't have a bitfield. 1156 if (BitWidth) { 1157 if (Member->isInvalidDecl()) { 1158 // don't emit another diagnostic. 1159 } else if (isa<VarDecl>(Member)) { 1160 // C++ 9.6p3: A bit-field shall not be a static member. 1161 // "static member 'A' cannot be a bit-field" 1162 Diag(Loc, diag::err_static_not_bitfield) 1163 << Name << BitWidth->getSourceRange(); 1164 } else if (isa<TypedefDecl>(Member)) { 1165 // "typedef member 'x' cannot be a bit-field" 1166 Diag(Loc, diag::err_typedef_not_bitfield) 1167 << Name << BitWidth->getSourceRange(); 1168 } else { 1169 // A function typedef ("typedef int f(); f a;"). 1170 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1171 Diag(Loc, diag::err_not_integral_type_bitfield) 1172 << Name << cast<ValueDecl>(Member)->getType() 1173 << BitWidth->getSourceRange(); 1174 } 1175 1176 BitWidth = 0; 1177 Member->setInvalidDecl(); 1178 } 1179 1180 Member->setAccess(AS); 1181 1182 // If we have declared a member function template, set the access of the 1183 // templated declaration as well. 1184 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1185 FunTmpl->getTemplatedDecl()->setAccess(AS); 1186 } 1187 1188 if (VS.isOverrideSpecified()) { 1189 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1190 if (!MD || !MD->isVirtual()) { 1191 Diag(Member->getLocStart(), 1192 diag::override_keyword_only_allowed_on_virtual_member_functions) 1193 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1194 } else 1195 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1196 } 1197 if (VS.isFinalSpecified()) { 1198 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1199 if (!MD || !MD->isVirtual()) { 1200 Diag(Member->getLocStart(), 1201 diag::override_keyword_only_allowed_on_virtual_member_functions) 1202 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1203 } else 1204 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1205 } 1206 1207 if (VS.getLastLocation().isValid()) { 1208 // Update the end location of a method that has a virt-specifiers. 1209 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1210 MD->setRangeEnd(VS.getLastLocation()); 1211 } 1212 1213 CheckOverrideControl(Member); 1214 1215 assert((Name || isInstField) && "No identifier for non-field ?"); 1216 1217 if (Init) 1218 AddInitializerToDecl(Member, Init, false, 1219 DS.getTypeSpecType() == DeclSpec::TST_auto); 1220 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1221 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1222 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1223 // data member if a brace-or-equal-initializer is provided. 1224 Diag(Loc, diag::err_auto_var_requires_init) 1225 << Name << cast<ValueDecl>(Member)->getType(); 1226 Member->setInvalidDecl(); 1227 } 1228 1229 FinalizeDeclaration(Member); 1230 1231 if (isInstField) 1232 FieldCollector->Add(cast<FieldDecl>(Member)); 1233 return Member; 1234} 1235 1236/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1237/// in-class initializer for a non-static C++ class member. Such parsing 1238/// is deferred until the class is complete. 1239void 1240Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1241 Expr *InitExpr) { 1242 FieldDecl *FD = cast<FieldDecl>(D); 1243 1244 if (!InitExpr) { 1245 FD->setInvalidDecl(); 1246 FD->removeInClassInitializer(); 1247 return; 1248 } 1249 1250 ExprResult Init = InitExpr; 1251 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1252 // FIXME: if there is no EqualLoc, this is list-initialization. 1253 Init = PerformCopyInitialization( 1254 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1255 if (Init.isInvalid()) { 1256 FD->setInvalidDecl(); 1257 return; 1258 } 1259 1260 CheckImplicitConversions(Init.get(), EqualLoc); 1261 } 1262 1263 // C++0x [class.base.init]p7: 1264 // The initialization of each base and member constitutes a 1265 // full-expression. 1266 Init = MaybeCreateExprWithCleanups(Init); 1267 if (Init.isInvalid()) { 1268 FD->setInvalidDecl(); 1269 return; 1270 } 1271 1272 InitExpr = Init.release(); 1273 1274 FD->setInClassInitializer(InitExpr); 1275} 1276 1277/// \brief Find the direct and/or virtual base specifiers that 1278/// correspond to the given base type, for use in base initialization 1279/// within a constructor. 1280static bool FindBaseInitializer(Sema &SemaRef, 1281 CXXRecordDecl *ClassDecl, 1282 QualType BaseType, 1283 const CXXBaseSpecifier *&DirectBaseSpec, 1284 const CXXBaseSpecifier *&VirtualBaseSpec) { 1285 // First, check for a direct base class. 1286 DirectBaseSpec = 0; 1287 for (CXXRecordDecl::base_class_const_iterator Base 1288 = ClassDecl->bases_begin(); 1289 Base != ClassDecl->bases_end(); ++Base) { 1290 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1291 // We found a direct base of this type. That's what we're 1292 // initializing. 1293 DirectBaseSpec = &*Base; 1294 break; 1295 } 1296 } 1297 1298 // Check for a virtual base class. 1299 // FIXME: We might be able to short-circuit this if we know in advance that 1300 // there are no virtual bases. 1301 VirtualBaseSpec = 0; 1302 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1303 // We haven't found a base yet; search the class hierarchy for a 1304 // virtual base class. 1305 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1306 /*DetectVirtual=*/false); 1307 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1308 BaseType, Paths)) { 1309 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1310 Path != Paths.end(); ++Path) { 1311 if (Path->back().Base->isVirtual()) { 1312 VirtualBaseSpec = Path->back().Base; 1313 break; 1314 } 1315 } 1316 } 1317 } 1318 1319 return DirectBaseSpec || VirtualBaseSpec; 1320} 1321 1322/// ActOnMemInitializer - Handle a C++ member initializer. 1323MemInitResult 1324Sema::ActOnMemInitializer(Decl *ConstructorD, 1325 Scope *S, 1326 CXXScopeSpec &SS, 1327 IdentifierInfo *MemberOrBase, 1328 ParsedType TemplateTypeTy, 1329 SourceLocation IdLoc, 1330 SourceLocation LParenLoc, 1331 ExprTy **Args, unsigned NumArgs, 1332 SourceLocation RParenLoc, 1333 SourceLocation EllipsisLoc) { 1334 if (!ConstructorD) 1335 return true; 1336 1337 AdjustDeclIfTemplate(ConstructorD); 1338 1339 CXXConstructorDecl *Constructor 1340 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1341 if (!Constructor) { 1342 // The user wrote a constructor initializer on a function that is 1343 // not a C++ constructor. Ignore the error for now, because we may 1344 // have more member initializers coming; we'll diagnose it just 1345 // once in ActOnMemInitializers. 1346 return true; 1347 } 1348 1349 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1350 1351 // C++ [class.base.init]p2: 1352 // Names in a mem-initializer-id are looked up in the scope of the 1353 // constructor's class and, if not found in that scope, are looked 1354 // up in the scope containing the constructor's definition. 1355 // [Note: if the constructor's class contains a member with the 1356 // same name as a direct or virtual base class of the class, a 1357 // mem-initializer-id naming the member or base class and composed 1358 // of a single identifier refers to the class member. A 1359 // mem-initializer-id for the hidden base class may be specified 1360 // using a qualified name. ] 1361 if (!SS.getScopeRep() && !TemplateTypeTy) { 1362 // Look for a member, first. 1363 FieldDecl *Member = 0; 1364 DeclContext::lookup_result Result 1365 = ClassDecl->lookup(MemberOrBase); 1366 if (Result.first != Result.second) { 1367 Member = dyn_cast<FieldDecl>(*Result.first); 1368 1369 if (Member) { 1370 if (EllipsisLoc.isValid()) 1371 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1372 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1373 1374 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1375 LParenLoc, RParenLoc); 1376 } 1377 1378 // Handle anonymous union case. 1379 if (IndirectFieldDecl* IndirectField 1380 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1381 if (EllipsisLoc.isValid()) 1382 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1383 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1384 1385 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1386 NumArgs, IdLoc, 1387 LParenLoc, RParenLoc); 1388 } 1389 } 1390 } 1391 // It didn't name a member, so see if it names a class. 1392 QualType BaseType; 1393 TypeSourceInfo *TInfo = 0; 1394 1395 if (TemplateTypeTy) { 1396 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1397 } else { 1398 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1399 LookupParsedName(R, S, &SS); 1400 1401 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1402 if (!TyD) { 1403 if (R.isAmbiguous()) return true; 1404 1405 // We don't want access-control diagnostics here. 1406 R.suppressDiagnostics(); 1407 1408 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1409 bool NotUnknownSpecialization = false; 1410 DeclContext *DC = computeDeclContext(SS, false); 1411 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1412 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1413 1414 if (!NotUnknownSpecialization) { 1415 // When the scope specifier can refer to a member of an unknown 1416 // specialization, we take it as a type name. 1417 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1418 SS.getWithLocInContext(Context), 1419 *MemberOrBase, IdLoc); 1420 if (BaseType.isNull()) 1421 return true; 1422 1423 R.clear(); 1424 R.setLookupName(MemberOrBase); 1425 } 1426 } 1427 1428 // If no results were found, try to correct typos. 1429 TypoCorrection Corr; 1430 if (R.empty() && BaseType.isNull() && 1431 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1432 ClassDecl, false, CTC_NoKeywords))) { 1433 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1434 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1435 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1436 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1437 // We have found a non-static data member with a similar 1438 // name to what was typed; complain and initialize that 1439 // member. 1440 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1441 << MemberOrBase << true << CorrectedQuotedStr 1442 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1443 Diag(Member->getLocation(), diag::note_previous_decl) 1444 << CorrectedQuotedStr; 1445 1446 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1447 LParenLoc, RParenLoc); 1448 } 1449 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1450 const CXXBaseSpecifier *DirectBaseSpec; 1451 const CXXBaseSpecifier *VirtualBaseSpec; 1452 if (FindBaseInitializer(*this, ClassDecl, 1453 Context.getTypeDeclType(Type), 1454 DirectBaseSpec, VirtualBaseSpec)) { 1455 // We have found a direct or virtual base class with a 1456 // similar name to what was typed; complain and initialize 1457 // that base class. 1458 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1459 << MemberOrBase << false << CorrectedQuotedStr 1460 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1461 1462 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1463 : VirtualBaseSpec; 1464 Diag(BaseSpec->getSourceRange().getBegin(), 1465 diag::note_base_class_specified_here) 1466 << BaseSpec->getType() 1467 << BaseSpec->getSourceRange(); 1468 1469 TyD = Type; 1470 } 1471 } 1472 } 1473 1474 if (!TyD && BaseType.isNull()) { 1475 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1476 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1477 return true; 1478 } 1479 } 1480 1481 if (BaseType.isNull()) { 1482 BaseType = Context.getTypeDeclType(TyD); 1483 if (SS.isSet()) { 1484 NestedNameSpecifier *Qualifier = 1485 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1486 1487 // FIXME: preserve source range information 1488 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1489 } 1490 } 1491 } 1492 1493 if (!TInfo) 1494 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1495 1496 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1497 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1498} 1499 1500/// Checks an initializer expression for use of uninitialized fields, such as 1501/// containing the field that is being initialized. Returns true if there is an 1502/// uninitialized field was used an updates the SourceLocation parameter; false 1503/// otherwise. 1504static bool InitExprContainsUninitializedFields(const Stmt *S, 1505 const ValueDecl *LhsField, 1506 SourceLocation *L) { 1507 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1508 1509 if (isa<CallExpr>(S)) { 1510 // Do not descend into function calls or constructors, as the use 1511 // of an uninitialized field may be valid. One would have to inspect 1512 // the contents of the function/ctor to determine if it is safe or not. 1513 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1514 // may be safe, depending on what the function/ctor does. 1515 return false; 1516 } 1517 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1518 const NamedDecl *RhsField = ME->getMemberDecl(); 1519 1520 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1521 // The member expression points to a static data member. 1522 assert(VD->isStaticDataMember() && 1523 "Member points to non-static data member!"); 1524 (void)VD; 1525 return false; 1526 } 1527 1528 if (isa<EnumConstantDecl>(RhsField)) { 1529 // The member expression points to an enum. 1530 return false; 1531 } 1532 1533 if (RhsField == LhsField) { 1534 // Initializing a field with itself. Throw a warning. 1535 // But wait; there are exceptions! 1536 // Exception #1: The field may not belong to this record. 1537 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1538 const Expr *base = ME->getBase(); 1539 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1540 // Even though the field matches, it does not belong to this record. 1541 return false; 1542 } 1543 // None of the exceptions triggered; return true to indicate an 1544 // uninitialized field was used. 1545 *L = ME->getMemberLoc(); 1546 return true; 1547 } 1548 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1549 // sizeof/alignof doesn't reference contents, do not warn. 1550 return false; 1551 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1552 // address-of doesn't reference contents (the pointer may be dereferenced 1553 // in the same expression but it would be rare; and weird). 1554 if (UOE->getOpcode() == UO_AddrOf) 1555 return false; 1556 } 1557 for (Stmt::const_child_range it = S->children(); it; ++it) { 1558 if (!*it) { 1559 // An expression such as 'member(arg ?: "")' may trigger this. 1560 continue; 1561 } 1562 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1563 return true; 1564 } 1565 return false; 1566} 1567 1568MemInitResult 1569Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1570 unsigned NumArgs, SourceLocation IdLoc, 1571 SourceLocation LParenLoc, 1572 SourceLocation RParenLoc) { 1573 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1574 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1575 assert((DirectMember || IndirectMember) && 1576 "Member must be a FieldDecl or IndirectFieldDecl"); 1577 1578 if (Member->isInvalidDecl()) 1579 return true; 1580 1581 // Diagnose value-uses of fields to initialize themselves, e.g. 1582 // foo(foo) 1583 // where foo is not also a parameter to the constructor. 1584 // TODO: implement -Wuninitialized and fold this into that framework. 1585 for (unsigned i = 0; i < NumArgs; ++i) { 1586 SourceLocation L; 1587 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1588 // FIXME: Return true in the case when other fields are used before being 1589 // uninitialized. For example, let this field be the i'th field. When 1590 // initializing the i'th field, throw a warning if any of the >= i'th 1591 // fields are used, as they are not yet initialized. 1592 // Right now we are only handling the case where the i'th field uses 1593 // itself in its initializer. 1594 Diag(L, diag::warn_field_is_uninit); 1595 } 1596 } 1597 1598 bool HasDependentArg = false; 1599 for (unsigned i = 0; i < NumArgs; i++) 1600 HasDependentArg |= Args[i]->isTypeDependent(); 1601 1602 Expr *Init; 1603 if (Member->getType()->isDependentType() || HasDependentArg) { 1604 // Can't check initialization for a member of dependent type or when 1605 // any of the arguments are type-dependent expressions. 1606 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1607 RParenLoc, 1608 Member->getType().getNonReferenceType()); 1609 1610 DiscardCleanupsInEvaluationContext(); 1611 } else { 1612 // Initialize the member. 1613 InitializedEntity MemberEntity = 1614 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1615 : InitializedEntity::InitializeMember(IndirectMember, 0); 1616 InitializationKind Kind = 1617 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1618 1619 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1620 1621 ExprResult MemberInit = 1622 InitSeq.Perform(*this, MemberEntity, Kind, 1623 MultiExprArg(*this, Args, NumArgs), 0); 1624 if (MemberInit.isInvalid()) 1625 return true; 1626 1627 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1628 1629 // C++0x [class.base.init]p7: 1630 // The initialization of each base and member constitutes a 1631 // full-expression. 1632 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1633 if (MemberInit.isInvalid()) 1634 return true; 1635 1636 // If we are in a dependent context, template instantiation will 1637 // perform this type-checking again. Just save the arguments that we 1638 // received in a ParenListExpr. 1639 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1640 // of the information that we have about the member 1641 // initializer. However, deconstructing the ASTs is a dicey process, 1642 // and this approach is far more likely to get the corner cases right. 1643 if (CurContext->isDependentContext()) 1644 Init = new (Context) ParenListExpr( 1645 Context, LParenLoc, Args, NumArgs, RParenLoc, 1646 Member->getType().getNonReferenceType()); 1647 else 1648 Init = MemberInit.get(); 1649 } 1650 1651 if (DirectMember) { 1652 return new (Context) CXXCtorInitializer(Context, DirectMember, 1653 IdLoc, LParenLoc, Init, 1654 RParenLoc); 1655 } else { 1656 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1657 IdLoc, LParenLoc, Init, 1658 RParenLoc); 1659 } 1660} 1661 1662MemInitResult 1663Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1664 Expr **Args, unsigned NumArgs, 1665 SourceLocation NameLoc, 1666 SourceLocation LParenLoc, 1667 SourceLocation RParenLoc, 1668 CXXRecordDecl *ClassDecl) { 1669 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1670 if (!LangOpts.CPlusPlus0x) 1671 return Diag(Loc, diag::err_delegation_0x_only) 1672 << TInfo->getTypeLoc().getLocalSourceRange(); 1673 1674 // Initialize the object. 1675 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1676 QualType(ClassDecl->getTypeForDecl(), 0)); 1677 InitializationKind Kind = 1678 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1679 1680 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1681 1682 ExprResult DelegationInit = 1683 InitSeq.Perform(*this, DelegationEntity, Kind, 1684 MultiExprArg(*this, Args, NumArgs), 0); 1685 if (DelegationInit.isInvalid()) 1686 return true; 1687 1688 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1689 CXXConstructorDecl *Constructor 1690 = ConExpr->getConstructor(); 1691 assert(Constructor && "Delegating constructor with no target?"); 1692 1693 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1694 1695 // C++0x [class.base.init]p7: 1696 // The initialization of each base and member constitutes a 1697 // full-expression. 1698 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1699 if (DelegationInit.isInvalid()) 1700 return true; 1701 1702 assert(!CurContext->isDependentContext()); 1703 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1704 DelegationInit.takeAs<Expr>(), 1705 RParenLoc); 1706} 1707 1708MemInitResult 1709Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1710 Expr **Args, unsigned NumArgs, 1711 SourceLocation LParenLoc, SourceLocation RParenLoc, 1712 CXXRecordDecl *ClassDecl, 1713 SourceLocation EllipsisLoc) { 1714 bool HasDependentArg = false; 1715 for (unsigned i = 0; i < NumArgs; i++) 1716 HasDependentArg |= Args[i]->isTypeDependent(); 1717 1718 SourceLocation BaseLoc 1719 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1720 1721 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1722 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1723 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1724 1725 // C++ [class.base.init]p2: 1726 // [...] Unless the mem-initializer-id names a nonstatic data 1727 // member of the constructor's class or a direct or virtual base 1728 // of that class, the mem-initializer is ill-formed. A 1729 // mem-initializer-list can initialize a base class using any 1730 // name that denotes that base class type. 1731 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1732 1733 if (EllipsisLoc.isValid()) { 1734 // This is a pack expansion. 1735 if (!BaseType->containsUnexpandedParameterPack()) { 1736 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1737 << SourceRange(BaseLoc, RParenLoc); 1738 1739 EllipsisLoc = SourceLocation(); 1740 } 1741 } else { 1742 // Check for any unexpanded parameter packs. 1743 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1744 return true; 1745 1746 for (unsigned I = 0; I != NumArgs; ++I) 1747 if (DiagnoseUnexpandedParameterPack(Args[I])) 1748 return true; 1749 } 1750 1751 // Check for direct and virtual base classes. 1752 const CXXBaseSpecifier *DirectBaseSpec = 0; 1753 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1754 if (!Dependent) { 1755 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1756 BaseType)) 1757 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1758 LParenLoc, RParenLoc, ClassDecl); 1759 1760 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1761 VirtualBaseSpec); 1762 1763 // C++ [base.class.init]p2: 1764 // Unless the mem-initializer-id names a nonstatic data member of the 1765 // constructor's class or a direct or virtual base of that class, the 1766 // mem-initializer is ill-formed. 1767 if (!DirectBaseSpec && !VirtualBaseSpec) { 1768 // If the class has any dependent bases, then it's possible that 1769 // one of those types will resolve to the same type as 1770 // BaseType. Therefore, just treat this as a dependent base 1771 // class initialization. FIXME: Should we try to check the 1772 // initialization anyway? It seems odd. 1773 if (ClassDecl->hasAnyDependentBases()) 1774 Dependent = true; 1775 else 1776 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1777 << BaseType << Context.getTypeDeclType(ClassDecl) 1778 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1779 } 1780 } 1781 1782 if (Dependent) { 1783 // Can't check initialization for a base of dependent type or when 1784 // any of the arguments are type-dependent expressions. 1785 ExprResult BaseInit 1786 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1787 RParenLoc, BaseType)); 1788 1789 DiscardCleanupsInEvaluationContext(); 1790 1791 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1792 /*IsVirtual=*/false, 1793 LParenLoc, 1794 BaseInit.takeAs<Expr>(), 1795 RParenLoc, 1796 EllipsisLoc); 1797 } 1798 1799 // C++ [base.class.init]p2: 1800 // If a mem-initializer-id is ambiguous because it designates both 1801 // a direct non-virtual base class and an inherited virtual base 1802 // class, the mem-initializer is ill-formed. 1803 if (DirectBaseSpec && VirtualBaseSpec) 1804 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1805 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1806 1807 CXXBaseSpecifier *BaseSpec 1808 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1809 if (!BaseSpec) 1810 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1811 1812 // Initialize the base. 1813 InitializedEntity BaseEntity = 1814 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1815 InitializationKind Kind = 1816 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1817 1818 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1819 1820 ExprResult BaseInit = 1821 InitSeq.Perform(*this, BaseEntity, Kind, 1822 MultiExprArg(*this, Args, NumArgs), 0); 1823 if (BaseInit.isInvalid()) 1824 return true; 1825 1826 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1827 1828 // C++0x [class.base.init]p7: 1829 // The initialization of each base and member constitutes a 1830 // full-expression. 1831 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1832 if (BaseInit.isInvalid()) 1833 return true; 1834 1835 // If we are in a dependent context, template instantiation will 1836 // perform this type-checking again. Just save the arguments that we 1837 // received in a ParenListExpr. 1838 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1839 // of the information that we have about the base 1840 // initializer. However, deconstructing the ASTs is a dicey process, 1841 // and this approach is far more likely to get the corner cases right. 1842 if (CurContext->isDependentContext()) { 1843 ExprResult Init 1844 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1845 RParenLoc, BaseType)); 1846 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1847 BaseSpec->isVirtual(), 1848 LParenLoc, 1849 Init.takeAs<Expr>(), 1850 RParenLoc, 1851 EllipsisLoc); 1852 } 1853 1854 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1855 BaseSpec->isVirtual(), 1856 LParenLoc, 1857 BaseInit.takeAs<Expr>(), 1858 RParenLoc, 1859 EllipsisLoc); 1860} 1861 1862/// ImplicitInitializerKind - How an implicit base or member initializer should 1863/// initialize its base or member. 1864enum ImplicitInitializerKind { 1865 IIK_Default, 1866 IIK_Copy, 1867 IIK_Move 1868}; 1869 1870static bool 1871BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1872 ImplicitInitializerKind ImplicitInitKind, 1873 CXXBaseSpecifier *BaseSpec, 1874 bool IsInheritedVirtualBase, 1875 CXXCtorInitializer *&CXXBaseInit) { 1876 InitializedEntity InitEntity 1877 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1878 IsInheritedVirtualBase); 1879 1880 ExprResult BaseInit; 1881 1882 switch (ImplicitInitKind) { 1883 case IIK_Default: { 1884 InitializationKind InitKind 1885 = InitializationKind::CreateDefault(Constructor->getLocation()); 1886 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1887 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1888 MultiExprArg(SemaRef, 0, 0)); 1889 break; 1890 } 1891 1892 case IIK_Copy: { 1893 ParmVarDecl *Param = Constructor->getParamDecl(0); 1894 QualType ParamType = Param->getType().getNonReferenceType(); 1895 1896 Expr *CopyCtorArg = 1897 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1898 Constructor->getLocation(), ParamType, 1899 VK_LValue, 0); 1900 1901 // Cast to the base class to avoid ambiguities. 1902 QualType ArgTy = 1903 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1904 ParamType.getQualifiers()); 1905 1906 CXXCastPath BasePath; 1907 BasePath.push_back(BaseSpec); 1908 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1909 CK_UncheckedDerivedToBase, 1910 VK_LValue, &BasePath).take(); 1911 1912 InitializationKind InitKind 1913 = InitializationKind::CreateDirect(Constructor->getLocation(), 1914 SourceLocation(), SourceLocation()); 1915 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1916 &CopyCtorArg, 1); 1917 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1918 MultiExprArg(&CopyCtorArg, 1)); 1919 break; 1920 } 1921 1922 case IIK_Move: 1923 assert(false && "Unhandled initializer kind!"); 1924 } 1925 1926 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1927 if (BaseInit.isInvalid()) 1928 return true; 1929 1930 CXXBaseInit = 1931 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1932 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1933 SourceLocation()), 1934 BaseSpec->isVirtual(), 1935 SourceLocation(), 1936 BaseInit.takeAs<Expr>(), 1937 SourceLocation(), 1938 SourceLocation()); 1939 1940 return false; 1941} 1942 1943static bool 1944BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1945 ImplicitInitializerKind ImplicitInitKind, 1946 FieldDecl *Field, 1947 CXXCtorInitializer *&CXXMemberInit) { 1948 if (Field->isInvalidDecl()) 1949 return true; 1950 1951 SourceLocation Loc = Constructor->getLocation(); 1952 1953 if (ImplicitInitKind == IIK_Copy) { 1954 ParmVarDecl *Param = Constructor->getParamDecl(0); 1955 QualType ParamType = Param->getType().getNonReferenceType(); 1956 1957 // Suppress copying zero-width bitfields. 1958 if (const Expr *Width = Field->getBitWidth()) 1959 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 1960 return false; 1961 1962 Expr *MemberExprBase = 1963 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1964 Loc, ParamType, VK_LValue, 0); 1965 1966 // Build a reference to this field within the parameter. 1967 CXXScopeSpec SS; 1968 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1969 Sema::LookupMemberName); 1970 MemberLookup.addDecl(Field, AS_public); 1971 MemberLookup.resolveKind(); 1972 ExprResult CopyCtorArg 1973 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1974 ParamType, Loc, 1975 /*IsArrow=*/false, 1976 SS, 1977 /*FirstQualifierInScope=*/0, 1978 MemberLookup, 1979 /*TemplateArgs=*/0); 1980 if (CopyCtorArg.isInvalid()) 1981 return true; 1982 1983 // When the field we are copying is an array, create index variables for 1984 // each dimension of the array. We use these index variables to subscript 1985 // the source array, and other clients (e.g., CodeGen) will perform the 1986 // necessary iteration with these index variables. 1987 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1988 QualType BaseType = Field->getType(); 1989 QualType SizeType = SemaRef.Context.getSizeType(); 1990 while (const ConstantArrayType *Array 1991 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1992 // Create the iteration variable for this array index. 1993 IdentifierInfo *IterationVarName = 0; 1994 { 1995 llvm::SmallString<8> Str; 1996 llvm::raw_svector_ostream OS(Str); 1997 OS << "__i" << IndexVariables.size(); 1998 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1999 } 2000 VarDecl *IterationVar 2001 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2002 IterationVarName, SizeType, 2003 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2004 SC_None, SC_None); 2005 IndexVariables.push_back(IterationVar); 2006 2007 // Create a reference to the iteration variable. 2008 ExprResult IterationVarRef 2009 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2010 assert(!IterationVarRef.isInvalid() && 2011 "Reference to invented variable cannot fail!"); 2012 2013 // Subscript the array with this iteration variable. 2014 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2015 Loc, 2016 IterationVarRef.take(), 2017 Loc); 2018 if (CopyCtorArg.isInvalid()) 2019 return true; 2020 2021 BaseType = Array->getElementType(); 2022 } 2023 2024 // Construct the entity that we will be initializing. For an array, this 2025 // will be first element in the array, which may require several levels 2026 // of array-subscript entities. 2027 llvm::SmallVector<InitializedEntity, 4> Entities; 2028 Entities.reserve(1 + IndexVariables.size()); 2029 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2030 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2031 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2032 0, 2033 Entities.back())); 2034 2035 // Direct-initialize to use the copy constructor. 2036 InitializationKind InitKind = 2037 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2038 2039 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2040 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2041 &CopyCtorArgE, 1); 2042 2043 ExprResult MemberInit 2044 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2045 MultiExprArg(&CopyCtorArgE, 1)); 2046 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2047 if (MemberInit.isInvalid()) 2048 return true; 2049 2050 CXXMemberInit 2051 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 2052 MemberInit.takeAs<Expr>(), Loc, 2053 IndexVariables.data(), 2054 IndexVariables.size()); 2055 return false; 2056 } 2057 2058 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2059 2060 QualType FieldBaseElementType = 2061 SemaRef.Context.getBaseElementType(Field->getType()); 2062 2063 if (FieldBaseElementType->isRecordType()) { 2064 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2065 InitializationKind InitKind = 2066 InitializationKind::CreateDefault(Loc); 2067 2068 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2069 ExprResult MemberInit = 2070 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2071 2072 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2073 if (MemberInit.isInvalid()) 2074 return true; 2075 2076 CXXMemberInit = 2077 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2078 Field, Loc, Loc, 2079 MemberInit.get(), 2080 Loc); 2081 return false; 2082 } 2083 2084 if (!Field->getParent()->isUnion()) { 2085 if (FieldBaseElementType->isReferenceType()) { 2086 SemaRef.Diag(Constructor->getLocation(), 2087 diag::err_uninitialized_member_in_ctor) 2088 << (int)Constructor->isImplicit() 2089 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2090 << 0 << Field->getDeclName(); 2091 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2092 return true; 2093 } 2094 2095 if (FieldBaseElementType.isConstQualified()) { 2096 SemaRef.Diag(Constructor->getLocation(), 2097 diag::err_uninitialized_member_in_ctor) 2098 << (int)Constructor->isImplicit() 2099 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2100 << 1 << Field->getDeclName(); 2101 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2102 return true; 2103 } 2104 } 2105 2106 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2107 FieldBaseElementType->isObjCRetainableType() && 2108 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2109 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2110 // Instant objects: 2111 // Default-initialize Objective-C pointers to NULL. 2112 CXXMemberInit 2113 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2114 Loc, Loc, 2115 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2116 Loc); 2117 return false; 2118 } 2119 2120 // Nothing to initialize. 2121 CXXMemberInit = 0; 2122 return false; 2123} 2124 2125namespace { 2126struct BaseAndFieldInfo { 2127 Sema &S; 2128 CXXConstructorDecl *Ctor; 2129 bool AnyErrorsInInits; 2130 ImplicitInitializerKind IIK; 2131 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2132 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2133 2134 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2135 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2136 // FIXME: Handle implicit move constructors. 2137 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2138 IIK = IIK_Copy; 2139 else 2140 IIK = IIK_Default; 2141 } 2142}; 2143} 2144 2145static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2146 FieldDecl *Top, FieldDecl *Field) { 2147 2148 // Overwhelmingly common case: we have a direct initializer for this field. 2149 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2150 Info.AllToInit.push_back(Init); 2151 return false; 2152 } 2153 2154 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2155 // has a brace-or-equal-initializer, the entity is initialized as specified 2156 // in [dcl.init]. 2157 if (Field->hasInClassInitializer()) { 2158 Info.AllToInit.push_back( 2159 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2160 SourceLocation(), 2161 SourceLocation(), 0, 2162 SourceLocation())); 2163 return false; 2164 } 2165 2166 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2167 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2168 assert(FieldClassType && "anonymous struct/union without record type"); 2169 CXXRecordDecl *FieldClassDecl 2170 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2171 2172 // Even though union members never have non-trivial default 2173 // constructions in C++03, we still build member initializers for aggregate 2174 // record types which can be union members, and C++0x allows non-trivial 2175 // default constructors for union members, so we ensure that only one 2176 // member is initialized for these. 2177 if (FieldClassDecl->isUnion()) { 2178 // First check for an explicit initializer for one field. 2179 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2180 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2181 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2182 Info.AllToInit.push_back(Init); 2183 2184 // Once we've initialized a field of an anonymous union, the union 2185 // field in the class is also initialized, so exit immediately. 2186 return false; 2187 } else if ((*FA)->isAnonymousStructOrUnion()) { 2188 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2189 return true; 2190 } 2191 } 2192 2193 // Fallthrough and construct a default initializer for the union as 2194 // a whole, which can call its default constructor if such a thing exists 2195 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2196 // behavior going forward with C++0x, when anonymous unions there are 2197 // finalized, we should revisit this. 2198 } else { 2199 // For structs, we simply descend through to initialize all members where 2200 // necessary. 2201 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2202 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2203 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2204 return true; 2205 } 2206 } 2207 } 2208 2209 // Don't try to build an implicit initializer if there were semantic 2210 // errors in any of the initializers (and therefore we might be 2211 // missing some that the user actually wrote). 2212 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2213 return false; 2214 2215 CXXCtorInitializer *Init = 0; 2216 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2217 return true; 2218 2219 if (Init) 2220 Info.AllToInit.push_back(Init); 2221 2222 return false; 2223} 2224 2225bool 2226Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2227 CXXCtorInitializer *Initializer) { 2228 assert(Initializer->isDelegatingInitializer()); 2229 Constructor->setNumCtorInitializers(1); 2230 CXXCtorInitializer **initializer = 2231 new (Context) CXXCtorInitializer*[1]; 2232 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2233 Constructor->setCtorInitializers(initializer); 2234 2235 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2236 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2237 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2238 } 2239 2240 DelegatingCtorDecls.push_back(Constructor); 2241 2242 return false; 2243} 2244 2245bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2246 CXXCtorInitializer **Initializers, 2247 unsigned NumInitializers, 2248 bool AnyErrors) { 2249 if (Constructor->getDeclContext()->isDependentContext()) { 2250 // Just store the initializers as written, they will be checked during 2251 // instantiation. 2252 if (NumInitializers > 0) { 2253 Constructor->setNumCtorInitializers(NumInitializers); 2254 CXXCtorInitializer **baseOrMemberInitializers = 2255 new (Context) CXXCtorInitializer*[NumInitializers]; 2256 memcpy(baseOrMemberInitializers, Initializers, 2257 NumInitializers * sizeof(CXXCtorInitializer*)); 2258 Constructor->setCtorInitializers(baseOrMemberInitializers); 2259 } 2260 2261 return false; 2262 } 2263 2264 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2265 2266 // We need to build the initializer AST according to order of construction 2267 // and not what user specified in the Initializers list. 2268 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2269 if (!ClassDecl) 2270 return true; 2271 2272 bool HadError = false; 2273 2274 for (unsigned i = 0; i < NumInitializers; i++) { 2275 CXXCtorInitializer *Member = Initializers[i]; 2276 2277 if (Member->isBaseInitializer()) 2278 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2279 else 2280 Info.AllBaseFields[Member->getAnyMember()] = Member; 2281 } 2282 2283 // Keep track of the direct virtual bases. 2284 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2285 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2286 E = ClassDecl->bases_end(); I != E; ++I) { 2287 if (I->isVirtual()) 2288 DirectVBases.insert(I); 2289 } 2290 2291 // Push virtual bases before others. 2292 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2293 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2294 2295 if (CXXCtorInitializer *Value 2296 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2297 Info.AllToInit.push_back(Value); 2298 } else if (!AnyErrors) { 2299 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2300 CXXCtorInitializer *CXXBaseInit; 2301 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2302 VBase, IsInheritedVirtualBase, 2303 CXXBaseInit)) { 2304 HadError = true; 2305 continue; 2306 } 2307 2308 Info.AllToInit.push_back(CXXBaseInit); 2309 } 2310 } 2311 2312 // Non-virtual bases. 2313 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2314 E = ClassDecl->bases_end(); Base != E; ++Base) { 2315 // Virtuals are in the virtual base list and already constructed. 2316 if (Base->isVirtual()) 2317 continue; 2318 2319 if (CXXCtorInitializer *Value 2320 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2321 Info.AllToInit.push_back(Value); 2322 } else if (!AnyErrors) { 2323 CXXCtorInitializer *CXXBaseInit; 2324 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2325 Base, /*IsInheritedVirtualBase=*/false, 2326 CXXBaseInit)) { 2327 HadError = true; 2328 continue; 2329 } 2330 2331 Info.AllToInit.push_back(CXXBaseInit); 2332 } 2333 } 2334 2335 // Fields. 2336 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2337 E = ClassDecl->field_end(); Field != E; ++Field) { 2338 if ((*Field)->getType()->isIncompleteArrayType()) { 2339 assert(ClassDecl->hasFlexibleArrayMember() && 2340 "Incomplete array type is not valid"); 2341 continue; 2342 } 2343 if (CollectFieldInitializer(*this, Info, *Field, *Field)) 2344 HadError = true; 2345 } 2346 2347 NumInitializers = Info.AllToInit.size(); 2348 if (NumInitializers > 0) { 2349 Constructor->setNumCtorInitializers(NumInitializers); 2350 CXXCtorInitializer **baseOrMemberInitializers = 2351 new (Context) CXXCtorInitializer*[NumInitializers]; 2352 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2353 NumInitializers * sizeof(CXXCtorInitializer*)); 2354 Constructor->setCtorInitializers(baseOrMemberInitializers); 2355 2356 // Constructors implicitly reference the base and member 2357 // destructors. 2358 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2359 Constructor->getParent()); 2360 } 2361 2362 return HadError; 2363} 2364 2365static void *GetKeyForTopLevelField(FieldDecl *Field) { 2366 // For anonymous unions, use the class declaration as the key. 2367 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2368 if (RT->getDecl()->isAnonymousStructOrUnion()) 2369 return static_cast<void *>(RT->getDecl()); 2370 } 2371 return static_cast<void *>(Field); 2372} 2373 2374static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2375 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2376} 2377 2378static void *GetKeyForMember(ASTContext &Context, 2379 CXXCtorInitializer *Member) { 2380 if (!Member->isAnyMemberInitializer()) 2381 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2382 2383 // For fields injected into the class via declaration of an anonymous union, 2384 // use its anonymous union class declaration as the unique key. 2385 FieldDecl *Field = Member->getAnyMember(); 2386 2387 // If the field is a member of an anonymous struct or union, our key 2388 // is the anonymous record decl that's a direct child of the class. 2389 RecordDecl *RD = Field->getParent(); 2390 if (RD->isAnonymousStructOrUnion()) { 2391 while (true) { 2392 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2393 if (Parent->isAnonymousStructOrUnion()) 2394 RD = Parent; 2395 else 2396 break; 2397 } 2398 2399 return static_cast<void *>(RD); 2400 } 2401 2402 return static_cast<void *>(Field); 2403} 2404 2405static void 2406DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2407 const CXXConstructorDecl *Constructor, 2408 CXXCtorInitializer **Inits, 2409 unsigned NumInits) { 2410 if (Constructor->getDeclContext()->isDependentContext()) 2411 return; 2412 2413 // Don't check initializers order unless the warning is enabled at the 2414 // location of at least one initializer. 2415 bool ShouldCheckOrder = false; 2416 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2417 CXXCtorInitializer *Init = Inits[InitIndex]; 2418 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2419 Init->getSourceLocation()) 2420 != Diagnostic::Ignored) { 2421 ShouldCheckOrder = true; 2422 break; 2423 } 2424 } 2425 if (!ShouldCheckOrder) 2426 return; 2427 2428 // Build the list of bases and members in the order that they'll 2429 // actually be initialized. The explicit initializers should be in 2430 // this same order but may be missing things. 2431 llvm::SmallVector<const void*, 32> IdealInitKeys; 2432 2433 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2434 2435 // 1. Virtual bases. 2436 for (CXXRecordDecl::base_class_const_iterator VBase = 2437 ClassDecl->vbases_begin(), 2438 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2439 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2440 2441 // 2. Non-virtual bases. 2442 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2443 E = ClassDecl->bases_end(); Base != E; ++Base) { 2444 if (Base->isVirtual()) 2445 continue; 2446 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2447 } 2448 2449 // 3. Direct fields. 2450 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2451 E = ClassDecl->field_end(); Field != E; ++Field) 2452 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2453 2454 unsigned NumIdealInits = IdealInitKeys.size(); 2455 unsigned IdealIndex = 0; 2456 2457 CXXCtorInitializer *PrevInit = 0; 2458 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2459 CXXCtorInitializer *Init = Inits[InitIndex]; 2460 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2461 2462 // Scan forward to try to find this initializer in the idealized 2463 // initializers list. 2464 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2465 if (InitKey == IdealInitKeys[IdealIndex]) 2466 break; 2467 2468 // If we didn't find this initializer, it must be because we 2469 // scanned past it on a previous iteration. That can only 2470 // happen if we're out of order; emit a warning. 2471 if (IdealIndex == NumIdealInits && PrevInit) { 2472 Sema::SemaDiagnosticBuilder D = 2473 SemaRef.Diag(PrevInit->getSourceLocation(), 2474 diag::warn_initializer_out_of_order); 2475 2476 if (PrevInit->isAnyMemberInitializer()) 2477 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2478 else 2479 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2480 2481 if (Init->isAnyMemberInitializer()) 2482 D << 0 << Init->getAnyMember()->getDeclName(); 2483 else 2484 D << 1 << Init->getBaseClassInfo()->getType(); 2485 2486 // Move back to the initializer's location in the ideal list. 2487 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2488 if (InitKey == IdealInitKeys[IdealIndex]) 2489 break; 2490 2491 assert(IdealIndex != NumIdealInits && 2492 "initializer not found in initializer list"); 2493 } 2494 2495 PrevInit = Init; 2496 } 2497} 2498 2499namespace { 2500bool CheckRedundantInit(Sema &S, 2501 CXXCtorInitializer *Init, 2502 CXXCtorInitializer *&PrevInit) { 2503 if (!PrevInit) { 2504 PrevInit = Init; 2505 return false; 2506 } 2507 2508 if (FieldDecl *Field = Init->getMember()) 2509 S.Diag(Init->getSourceLocation(), 2510 diag::err_multiple_mem_initialization) 2511 << Field->getDeclName() 2512 << Init->getSourceRange(); 2513 else { 2514 const Type *BaseClass = Init->getBaseClass(); 2515 assert(BaseClass && "neither field nor base"); 2516 S.Diag(Init->getSourceLocation(), 2517 diag::err_multiple_base_initialization) 2518 << QualType(BaseClass, 0) 2519 << Init->getSourceRange(); 2520 } 2521 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2522 << 0 << PrevInit->getSourceRange(); 2523 2524 return true; 2525} 2526 2527typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2528typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2529 2530bool CheckRedundantUnionInit(Sema &S, 2531 CXXCtorInitializer *Init, 2532 RedundantUnionMap &Unions) { 2533 FieldDecl *Field = Init->getAnyMember(); 2534 RecordDecl *Parent = Field->getParent(); 2535 if (!Parent->isAnonymousStructOrUnion()) 2536 return false; 2537 2538 NamedDecl *Child = Field; 2539 do { 2540 if (Parent->isUnion()) { 2541 UnionEntry &En = Unions[Parent]; 2542 if (En.first && En.first != Child) { 2543 S.Diag(Init->getSourceLocation(), 2544 diag::err_multiple_mem_union_initialization) 2545 << Field->getDeclName() 2546 << Init->getSourceRange(); 2547 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2548 << 0 << En.second->getSourceRange(); 2549 return true; 2550 } else if (!En.first) { 2551 En.first = Child; 2552 En.second = Init; 2553 } 2554 } 2555 2556 Child = Parent; 2557 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2558 } while (Parent->isAnonymousStructOrUnion()); 2559 2560 return false; 2561} 2562} 2563 2564/// ActOnMemInitializers - Handle the member initializers for a constructor. 2565void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2566 SourceLocation ColonLoc, 2567 MemInitTy **meminits, unsigned NumMemInits, 2568 bool AnyErrors) { 2569 if (!ConstructorDecl) 2570 return; 2571 2572 AdjustDeclIfTemplate(ConstructorDecl); 2573 2574 CXXConstructorDecl *Constructor 2575 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2576 2577 if (!Constructor) { 2578 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2579 return; 2580 } 2581 2582 CXXCtorInitializer **MemInits = 2583 reinterpret_cast<CXXCtorInitializer **>(meminits); 2584 2585 // Mapping for the duplicate initializers check. 2586 // For member initializers, this is keyed with a FieldDecl*. 2587 // For base initializers, this is keyed with a Type*. 2588 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2589 2590 // Mapping for the inconsistent anonymous-union initializers check. 2591 RedundantUnionMap MemberUnions; 2592 2593 bool HadError = false; 2594 for (unsigned i = 0; i < NumMemInits; i++) { 2595 CXXCtorInitializer *Init = MemInits[i]; 2596 2597 // Set the source order index. 2598 Init->setSourceOrder(i); 2599 2600 if (Init->isAnyMemberInitializer()) { 2601 FieldDecl *Field = Init->getAnyMember(); 2602 if (CheckRedundantInit(*this, Init, Members[Field]) || 2603 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2604 HadError = true; 2605 } else if (Init->isBaseInitializer()) { 2606 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2607 if (CheckRedundantInit(*this, Init, Members[Key])) 2608 HadError = true; 2609 } else { 2610 assert(Init->isDelegatingInitializer()); 2611 // This must be the only initializer 2612 if (i != 0 || NumMemInits > 1) { 2613 Diag(MemInits[0]->getSourceLocation(), 2614 diag::err_delegating_initializer_alone) 2615 << MemInits[0]->getSourceRange(); 2616 HadError = true; 2617 // We will treat this as being the only initializer. 2618 } 2619 SetDelegatingInitializer(Constructor, MemInits[i]); 2620 // Return immediately as the initializer is set. 2621 return; 2622 } 2623 } 2624 2625 if (HadError) 2626 return; 2627 2628 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2629 2630 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2631} 2632 2633void 2634Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2635 CXXRecordDecl *ClassDecl) { 2636 // Ignore dependent contexts. 2637 if (ClassDecl->isDependentContext()) 2638 return; 2639 2640 // FIXME: all the access-control diagnostics are positioned on the 2641 // field/base declaration. That's probably good; that said, the 2642 // user might reasonably want to know why the destructor is being 2643 // emitted, and we currently don't say. 2644 2645 // Non-static data members. 2646 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2647 E = ClassDecl->field_end(); I != E; ++I) { 2648 FieldDecl *Field = *I; 2649 if (Field->isInvalidDecl()) 2650 continue; 2651 QualType FieldType = Context.getBaseElementType(Field->getType()); 2652 2653 const RecordType* RT = FieldType->getAs<RecordType>(); 2654 if (!RT) 2655 continue; 2656 2657 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2658 if (FieldClassDecl->isInvalidDecl()) 2659 continue; 2660 if (FieldClassDecl->hasTrivialDestructor()) 2661 continue; 2662 2663 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2664 assert(Dtor && "No dtor found for FieldClassDecl!"); 2665 CheckDestructorAccess(Field->getLocation(), Dtor, 2666 PDiag(diag::err_access_dtor_field) 2667 << Field->getDeclName() 2668 << FieldType); 2669 2670 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2671 } 2672 2673 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2674 2675 // Bases. 2676 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2677 E = ClassDecl->bases_end(); Base != E; ++Base) { 2678 // Bases are always records in a well-formed non-dependent class. 2679 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2680 2681 // Remember direct virtual bases. 2682 if (Base->isVirtual()) 2683 DirectVirtualBases.insert(RT); 2684 2685 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2686 // If our base class is invalid, we probably can't get its dtor anyway. 2687 if (BaseClassDecl->isInvalidDecl()) 2688 continue; 2689 // Ignore trivial destructors. 2690 if (BaseClassDecl->hasTrivialDestructor()) 2691 continue; 2692 2693 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2694 assert(Dtor && "No dtor found for BaseClassDecl!"); 2695 2696 // FIXME: caret should be on the start of the class name 2697 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2698 PDiag(diag::err_access_dtor_base) 2699 << Base->getType() 2700 << Base->getSourceRange()); 2701 2702 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2703 } 2704 2705 // Virtual bases. 2706 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2707 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2708 2709 // Bases are always records in a well-formed non-dependent class. 2710 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2711 2712 // Ignore direct virtual bases. 2713 if (DirectVirtualBases.count(RT)) 2714 continue; 2715 2716 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2717 // If our base class is invalid, we probably can't get its dtor anyway. 2718 if (BaseClassDecl->isInvalidDecl()) 2719 continue; 2720 // Ignore trivial destructors. 2721 if (BaseClassDecl->hasTrivialDestructor()) 2722 continue; 2723 2724 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2725 assert(Dtor && "No dtor found for BaseClassDecl!"); 2726 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2727 PDiag(diag::err_access_dtor_vbase) 2728 << VBase->getType()); 2729 2730 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2731 } 2732} 2733 2734void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2735 if (!CDtorDecl) 2736 return; 2737 2738 if (CXXConstructorDecl *Constructor 2739 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2740 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2741} 2742 2743bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2744 unsigned DiagID, AbstractDiagSelID SelID) { 2745 if (SelID == -1) 2746 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2747 else 2748 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2749} 2750 2751bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2752 const PartialDiagnostic &PD) { 2753 if (!getLangOptions().CPlusPlus) 2754 return false; 2755 2756 if (const ArrayType *AT = Context.getAsArrayType(T)) 2757 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2758 2759 if (const PointerType *PT = T->getAs<PointerType>()) { 2760 // Find the innermost pointer type. 2761 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2762 PT = T; 2763 2764 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2765 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2766 } 2767 2768 const RecordType *RT = T->getAs<RecordType>(); 2769 if (!RT) 2770 return false; 2771 2772 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2773 2774 // We can't answer whether something is abstract until it has a 2775 // definition. If it's currently being defined, we'll walk back 2776 // over all the declarations when we have a full definition. 2777 const CXXRecordDecl *Def = RD->getDefinition(); 2778 if (!Def || Def->isBeingDefined()) 2779 return false; 2780 2781 if (!RD->isAbstract()) 2782 return false; 2783 2784 Diag(Loc, PD) << RD->getDeclName(); 2785 DiagnoseAbstractType(RD); 2786 2787 return true; 2788} 2789 2790void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2791 // Check if we've already emitted the list of pure virtual functions 2792 // for this class. 2793 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2794 return; 2795 2796 CXXFinalOverriderMap FinalOverriders; 2797 RD->getFinalOverriders(FinalOverriders); 2798 2799 // Keep a set of seen pure methods so we won't diagnose the same method 2800 // more than once. 2801 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2802 2803 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2804 MEnd = FinalOverriders.end(); 2805 M != MEnd; 2806 ++M) { 2807 for (OverridingMethods::iterator SO = M->second.begin(), 2808 SOEnd = M->second.end(); 2809 SO != SOEnd; ++SO) { 2810 // C++ [class.abstract]p4: 2811 // A class is abstract if it contains or inherits at least one 2812 // pure virtual function for which the final overrider is pure 2813 // virtual. 2814 2815 // 2816 if (SO->second.size() != 1) 2817 continue; 2818 2819 if (!SO->second.front().Method->isPure()) 2820 continue; 2821 2822 if (!SeenPureMethods.insert(SO->second.front().Method)) 2823 continue; 2824 2825 Diag(SO->second.front().Method->getLocation(), 2826 diag::note_pure_virtual_function) 2827 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2828 } 2829 } 2830 2831 if (!PureVirtualClassDiagSet) 2832 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2833 PureVirtualClassDiagSet->insert(RD); 2834} 2835 2836namespace { 2837struct AbstractUsageInfo { 2838 Sema &S; 2839 CXXRecordDecl *Record; 2840 CanQualType AbstractType; 2841 bool Invalid; 2842 2843 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2844 : S(S), Record(Record), 2845 AbstractType(S.Context.getCanonicalType( 2846 S.Context.getTypeDeclType(Record))), 2847 Invalid(false) {} 2848 2849 void DiagnoseAbstractType() { 2850 if (Invalid) return; 2851 S.DiagnoseAbstractType(Record); 2852 Invalid = true; 2853 } 2854 2855 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2856}; 2857 2858struct CheckAbstractUsage { 2859 AbstractUsageInfo &Info; 2860 const NamedDecl *Ctx; 2861 2862 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2863 : Info(Info), Ctx(Ctx) {} 2864 2865 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2866 switch (TL.getTypeLocClass()) { 2867#define ABSTRACT_TYPELOC(CLASS, PARENT) 2868#define TYPELOC(CLASS, PARENT) \ 2869 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2870#include "clang/AST/TypeLocNodes.def" 2871 } 2872 } 2873 2874 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2875 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2876 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2877 if (!TL.getArg(I)) 2878 continue; 2879 2880 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2881 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2882 } 2883 } 2884 2885 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2886 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2887 } 2888 2889 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2890 // Visit the type parameters from a permissive context. 2891 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2892 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2893 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2894 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2895 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2896 // TODO: other template argument types? 2897 } 2898 } 2899 2900 // Visit pointee types from a permissive context. 2901#define CheckPolymorphic(Type) \ 2902 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2903 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2904 } 2905 CheckPolymorphic(PointerTypeLoc) 2906 CheckPolymorphic(ReferenceTypeLoc) 2907 CheckPolymorphic(MemberPointerTypeLoc) 2908 CheckPolymorphic(BlockPointerTypeLoc) 2909 2910 /// Handle all the types we haven't given a more specific 2911 /// implementation for above. 2912 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2913 // Every other kind of type that we haven't called out already 2914 // that has an inner type is either (1) sugar or (2) contains that 2915 // inner type in some way as a subobject. 2916 if (TypeLoc Next = TL.getNextTypeLoc()) 2917 return Visit(Next, Sel); 2918 2919 // If there's no inner type and we're in a permissive context, 2920 // don't diagnose. 2921 if (Sel == Sema::AbstractNone) return; 2922 2923 // Check whether the type matches the abstract type. 2924 QualType T = TL.getType(); 2925 if (T->isArrayType()) { 2926 Sel = Sema::AbstractArrayType; 2927 T = Info.S.Context.getBaseElementType(T); 2928 } 2929 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2930 if (CT != Info.AbstractType) return; 2931 2932 // It matched; do some magic. 2933 if (Sel == Sema::AbstractArrayType) { 2934 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2935 << T << TL.getSourceRange(); 2936 } else { 2937 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2938 << Sel << T << TL.getSourceRange(); 2939 } 2940 Info.DiagnoseAbstractType(); 2941 } 2942}; 2943 2944void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2945 Sema::AbstractDiagSelID Sel) { 2946 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2947} 2948 2949} 2950 2951/// Check for invalid uses of an abstract type in a method declaration. 2952static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2953 CXXMethodDecl *MD) { 2954 // No need to do the check on definitions, which require that 2955 // the return/param types be complete. 2956 if (MD->doesThisDeclarationHaveABody()) 2957 return; 2958 2959 // For safety's sake, just ignore it if we don't have type source 2960 // information. This should never happen for non-implicit methods, 2961 // but... 2962 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2963 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2964} 2965 2966/// Check for invalid uses of an abstract type within a class definition. 2967static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2968 CXXRecordDecl *RD) { 2969 for (CXXRecordDecl::decl_iterator 2970 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2971 Decl *D = *I; 2972 if (D->isImplicit()) continue; 2973 2974 // Methods and method templates. 2975 if (isa<CXXMethodDecl>(D)) { 2976 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2977 } else if (isa<FunctionTemplateDecl>(D)) { 2978 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2979 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2980 2981 // Fields and static variables. 2982 } else if (isa<FieldDecl>(D)) { 2983 FieldDecl *FD = cast<FieldDecl>(D); 2984 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2985 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2986 } else if (isa<VarDecl>(D)) { 2987 VarDecl *VD = cast<VarDecl>(D); 2988 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2989 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2990 2991 // Nested classes and class templates. 2992 } else if (isa<CXXRecordDecl>(D)) { 2993 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2994 } else if (isa<ClassTemplateDecl>(D)) { 2995 CheckAbstractClassUsage(Info, 2996 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2997 } 2998 } 2999} 3000 3001/// \brief Perform semantic checks on a class definition that has been 3002/// completing, introducing implicitly-declared members, checking for 3003/// abstract types, etc. 3004void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3005 if (!Record) 3006 return; 3007 3008 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3009 AbstractUsageInfo Info(*this, Record); 3010 CheckAbstractClassUsage(Info, Record); 3011 } 3012 3013 // If this is not an aggregate type and has no user-declared constructor, 3014 // complain about any non-static data members of reference or const scalar 3015 // type, since they will never get initializers. 3016 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3017 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3018 bool Complained = false; 3019 for (RecordDecl::field_iterator F = Record->field_begin(), 3020 FEnd = Record->field_end(); 3021 F != FEnd; ++F) { 3022 if (F->hasInClassInitializer()) 3023 continue; 3024 3025 if (F->getType()->isReferenceType() || 3026 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3027 if (!Complained) { 3028 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3029 << Record->getTagKind() << Record; 3030 Complained = true; 3031 } 3032 3033 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3034 << F->getType()->isReferenceType() 3035 << F->getDeclName(); 3036 } 3037 } 3038 } 3039 3040 if (Record->isDynamicClass() && !Record->isDependentType()) 3041 DynamicClasses.push_back(Record); 3042 3043 if (Record->getIdentifier()) { 3044 // C++ [class.mem]p13: 3045 // If T is the name of a class, then each of the following shall have a 3046 // name different from T: 3047 // - every member of every anonymous union that is a member of class T. 3048 // 3049 // C++ [class.mem]p14: 3050 // In addition, if class T has a user-declared constructor (12.1), every 3051 // non-static data member of class T shall have a name different from T. 3052 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3053 R.first != R.second; ++R.first) { 3054 NamedDecl *D = *R.first; 3055 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3056 isa<IndirectFieldDecl>(D)) { 3057 Diag(D->getLocation(), diag::err_member_name_of_class) 3058 << D->getDeclName(); 3059 break; 3060 } 3061 } 3062 } 3063 3064 // Warn if the class has virtual methods but non-virtual public destructor. 3065 if (Record->isPolymorphic() && !Record->isDependentType()) { 3066 CXXDestructorDecl *dtor = Record->getDestructor(); 3067 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3068 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3069 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3070 } 3071 3072 // See if a method overloads virtual methods in a base 3073 /// class without overriding any. 3074 if (!Record->isDependentType()) { 3075 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3076 MEnd = Record->method_end(); 3077 M != MEnd; ++M) { 3078 if (!(*M)->isStatic()) 3079 DiagnoseHiddenVirtualMethods(Record, *M); 3080 } 3081 } 3082 3083 // Declare inherited constructors. We do this eagerly here because: 3084 // - The standard requires an eager diagnostic for conflicting inherited 3085 // constructors from different classes. 3086 // - The lazy declaration of the other implicit constructors is so as to not 3087 // waste space and performance on classes that are not meant to be 3088 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3089 // have inherited constructors. 3090 DeclareInheritedConstructors(Record); 3091 3092 if (!Record->isDependentType()) 3093 CheckExplicitlyDefaultedMethods(Record); 3094} 3095 3096void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3097 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3098 ME = Record->method_end(); 3099 MI != ME; ++MI) { 3100 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3101 switch (getSpecialMember(*MI)) { 3102 case CXXDefaultConstructor: 3103 CheckExplicitlyDefaultedDefaultConstructor( 3104 cast<CXXConstructorDecl>(*MI)); 3105 break; 3106 3107 case CXXDestructor: 3108 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3109 break; 3110 3111 case CXXCopyConstructor: 3112 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3113 break; 3114 3115 case CXXCopyAssignment: 3116 CheckExplicitlyDefaultedCopyAssignment(*MI); 3117 break; 3118 3119 case CXXMoveConstructor: 3120 case CXXMoveAssignment: 3121 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3122 break; 3123 3124 default: 3125 // FIXME: Do moves once they exist 3126 llvm_unreachable("non-special member explicitly defaulted!"); 3127 } 3128 } 3129 } 3130 3131} 3132 3133void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3134 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3135 3136 // Whether this was the first-declared instance of the constructor. 3137 // This affects whether we implicitly add an exception spec (and, eventually, 3138 // constexpr). It is also ill-formed to explicitly default a constructor such 3139 // that it would be deleted. (C++0x [decl.fct.def.default]) 3140 bool First = CD == CD->getCanonicalDecl(); 3141 3142 bool HadError = false; 3143 if (CD->getNumParams() != 0) { 3144 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3145 << CD->getSourceRange(); 3146 HadError = true; 3147 } 3148 3149 ImplicitExceptionSpecification Spec 3150 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3151 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3152 if (EPI.ExceptionSpecType == EST_Delayed) { 3153 // Exception specification depends on some deferred part of the class. We'll 3154 // try again when the class's definition has been fully processed. 3155 return; 3156 } 3157 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3158 *ExceptionType = Context.getFunctionType( 3159 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3160 3161 if (CtorType->hasExceptionSpec()) { 3162 if (CheckEquivalentExceptionSpec( 3163 PDiag(diag::err_incorrect_defaulted_exception_spec) 3164 << CXXDefaultConstructor, 3165 PDiag(), 3166 ExceptionType, SourceLocation(), 3167 CtorType, CD->getLocation())) { 3168 HadError = true; 3169 } 3170 } else if (First) { 3171 // We set the declaration to have the computed exception spec here. 3172 // We know there are no parameters. 3173 EPI.ExtInfo = CtorType->getExtInfo(); 3174 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3175 } 3176 3177 if (HadError) { 3178 CD->setInvalidDecl(); 3179 return; 3180 } 3181 3182 if (ShouldDeleteDefaultConstructor(CD)) { 3183 if (First) { 3184 CD->setDeletedAsWritten(); 3185 } else { 3186 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3187 << CXXDefaultConstructor; 3188 CD->setInvalidDecl(); 3189 } 3190 } 3191} 3192 3193void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3194 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3195 3196 // Whether this was the first-declared instance of the constructor. 3197 bool First = CD == CD->getCanonicalDecl(); 3198 3199 bool HadError = false; 3200 if (CD->getNumParams() != 1) { 3201 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3202 << CD->getSourceRange(); 3203 HadError = true; 3204 } 3205 3206 ImplicitExceptionSpecification Spec(Context); 3207 bool Const; 3208 llvm::tie(Spec, Const) = 3209 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3210 3211 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3212 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3213 *ExceptionType = Context.getFunctionType( 3214 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3215 3216 // Check for parameter type matching. 3217 // This is a copy ctor so we know it's a cv-qualified reference to T. 3218 QualType ArgType = CtorType->getArgType(0); 3219 if (ArgType->getPointeeType().isVolatileQualified()) { 3220 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3221 HadError = true; 3222 } 3223 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3224 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3225 HadError = true; 3226 } 3227 3228 if (CtorType->hasExceptionSpec()) { 3229 if (CheckEquivalentExceptionSpec( 3230 PDiag(diag::err_incorrect_defaulted_exception_spec) 3231 << CXXCopyConstructor, 3232 PDiag(), 3233 ExceptionType, SourceLocation(), 3234 CtorType, CD->getLocation())) { 3235 HadError = true; 3236 } 3237 } else if (First) { 3238 // We set the declaration to have the computed exception spec here. 3239 // We duplicate the one parameter type. 3240 EPI.ExtInfo = CtorType->getExtInfo(); 3241 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3242 } 3243 3244 if (HadError) { 3245 CD->setInvalidDecl(); 3246 return; 3247 } 3248 3249 if (ShouldDeleteCopyConstructor(CD)) { 3250 if (First) { 3251 CD->setDeletedAsWritten(); 3252 } else { 3253 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3254 << CXXCopyConstructor; 3255 CD->setInvalidDecl(); 3256 } 3257 } 3258} 3259 3260void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3261 assert(MD->isExplicitlyDefaulted()); 3262 3263 // Whether this was the first-declared instance of the operator 3264 bool First = MD == MD->getCanonicalDecl(); 3265 3266 bool HadError = false; 3267 if (MD->getNumParams() != 1) { 3268 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3269 << MD->getSourceRange(); 3270 HadError = true; 3271 } 3272 3273 QualType ReturnType = 3274 MD->getType()->getAs<FunctionType>()->getResultType(); 3275 if (!ReturnType->isLValueReferenceType() || 3276 !Context.hasSameType( 3277 Context.getCanonicalType(ReturnType->getPointeeType()), 3278 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3279 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3280 HadError = true; 3281 } 3282 3283 ImplicitExceptionSpecification Spec(Context); 3284 bool Const; 3285 llvm::tie(Spec, Const) = 3286 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3287 3288 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3289 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3290 *ExceptionType = Context.getFunctionType( 3291 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3292 3293 QualType ArgType = OperType->getArgType(0); 3294 if (!ArgType->isReferenceType()) { 3295 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3296 HadError = true; 3297 } else { 3298 if (ArgType->getPointeeType().isVolatileQualified()) { 3299 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3300 HadError = true; 3301 } 3302 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3303 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3304 HadError = true; 3305 } 3306 } 3307 3308 if (OperType->getTypeQuals()) { 3309 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3310 HadError = true; 3311 } 3312 3313 if (OperType->hasExceptionSpec()) { 3314 if (CheckEquivalentExceptionSpec( 3315 PDiag(diag::err_incorrect_defaulted_exception_spec) 3316 << CXXCopyAssignment, 3317 PDiag(), 3318 ExceptionType, SourceLocation(), 3319 OperType, MD->getLocation())) { 3320 HadError = true; 3321 } 3322 } else if (First) { 3323 // We set the declaration to have the computed exception spec here. 3324 // We duplicate the one parameter type. 3325 EPI.RefQualifier = OperType->getRefQualifier(); 3326 EPI.ExtInfo = OperType->getExtInfo(); 3327 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3328 } 3329 3330 if (HadError) { 3331 MD->setInvalidDecl(); 3332 return; 3333 } 3334 3335 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3336 if (First) { 3337 MD->setDeletedAsWritten(); 3338 } else { 3339 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3340 << CXXCopyAssignment; 3341 MD->setInvalidDecl(); 3342 } 3343 } 3344} 3345 3346void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3347 assert(DD->isExplicitlyDefaulted()); 3348 3349 // Whether this was the first-declared instance of the destructor. 3350 bool First = DD == DD->getCanonicalDecl(); 3351 3352 ImplicitExceptionSpecification Spec 3353 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3354 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3355 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3356 *ExceptionType = Context.getFunctionType( 3357 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3358 3359 if (DtorType->hasExceptionSpec()) { 3360 if (CheckEquivalentExceptionSpec( 3361 PDiag(diag::err_incorrect_defaulted_exception_spec) 3362 << CXXDestructor, 3363 PDiag(), 3364 ExceptionType, SourceLocation(), 3365 DtorType, DD->getLocation())) { 3366 DD->setInvalidDecl(); 3367 return; 3368 } 3369 } else if (First) { 3370 // We set the declaration to have the computed exception spec here. 3371 // There are no parameters. 3372 EPI.ExtInfo = DtorType->getExtInfo(); 3373 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3374 } 3375 3376 if (ShouldDeleteDestructor(DD)) { 3377 if (First) { 3378 DD->setDeletedAsWritten(); 3379 } else { 3380 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3381 << CXXDestructor; 3382 DD->setInvalidDecl(); 3383 } 3384 } 3385} 3386 3387bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3388 CXXRecordDecl *RD = CD->getParent(); 3389 assert(!RD->isDependentType() && "do deletion after instantiation"); 3390 if (!LangOpts.CPlusPlus0x) 3391 return false; 3392 3393 SourceLocation Loc = CD->getLocation(); 3394 3395 // Do access control from the constructor 3396 ContextRAII CtorContext(*this, CD); 3397 3398 bool Union = RD->isUnion(); 3399 bool AllConst = true; 3400 3401 // We do this because we should never actually use an anonymous 3402 // union's constructor. 3403 if (Union && RD->isAnonymousStructOrUnion()) 3404 return false; 3405 3406 // FIXME: We should put some diagnostic logic right into this function. 3407 3408 // C++0x [class.ctor]/5 3409 // A defaulted default constructor for class X is defined as deleted if: 3410 3411 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3412 BE = RD->bases_end(); 3413 BI != BE; ++BI) { 3414 // We'll handle this one later 3415 if (BI->isVirtual()) 3416 continue; 3417 3418 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3419 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3420 3421 // -- any [direct base class] has a type with a destructor that is 3422 // deleted or inaccessible from the defaulted default constructor 3423 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3424 if (BaseDtor->isDeleted()) 3425 return true; 3426 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3427 AR_accessible) 3428 return true; 3429 3430 // -- any [direct base class either] has no default constructor or 3431 // overload resolution as applied to [its] default constructor 3432 // results in an ambiguity or in a function that is deleted or 3433 // inaccessible from the defaulted default constructor 3434 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3435 if (!BaseDefault || BaseDefault->isDeleted()) 3436 return true; 3437 3438 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3439 PDiag()) != AR_accessible) 3440 return true; 3441 } 3442 3443 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3444 BE = RD->vbases_end(); 3445 BI != BE; ++BI) { 3446 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3447 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3448 3449 // -- any [virtual base class] has a type with a destructor that is 3450 // delete or inaccessible from the defaulted default constructor 3451 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3452 if (BaseDtor->isDeleted()) 3453 return true; 3454 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3455 AR_accessible) 3456 return true; 3457 3458 // -- any [virtual base class either] has no default constructor or 3459 // overload resolution as applied to [its] default constructor 3460 // results in an ambiguity or in a function that is deleted or 3461 // inaccessible from the defaulted default constructor 3462 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3463 if (!BaseDefault || BaseDefault->isDeleted()) 3464 return true; 3465 3466 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3467 PDiag()) != AR_accessible) 3468 return true; 3469 } 3470 3471 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3472 FE = RD->field_end(); 3473 FI != FE; ++FI) { 3474 if (FI->isInvalidDecl()) 3475 continue; 3476 3477 QualType FieldType = Context.getBaseElementType(FI->getType()); 3478 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3479 3480 // -- any non-static data member with no brace-or-equal-initializer is of 3481 // reference type 3482 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3483 return true; 3484 3485 // -- X is a union and all its variant members are of const-qualified type 3486 // (or array thereof) 3487 if (Union && !FieldType.isConstQualified()) 3488 AllConst = false; 3489 3490 if (FieldRecord) { 3491 // -- X is a union-like class that has a variant member with a non-trivial 3492 // default constructor 3493 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3494 return true; 3495 3496 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3497 if (FieldDtor->isDeleted()) 3498 return true; 3499 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3500 AR_accessible) 3501 return true; 3502 3503 // -- any non-variant non-static data member of const-qualified type (or 3504 // array thereof) with no brace-or-equal-initializer does not have a 3505 // user-provided default constructor 3506 if (FieldType.isConstQualified() && 3507 !FI->hasInClassInitializer() && 3508 !FieldRecord->hasUserProvidedDefaultConstructor()) 3509 return true; 3510 3511 if (!Union && FieldRecord->isUnion() && 3512 FieldRecord->isAnonymousStructOrUnion()) { 3513 // We're okay to reuse AllConst here since we only care about the 3514 // value otherwise if we're in a union. 3515 AllConst = true; 3516 3517 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3518 UE = FieldRecord->field_end(); 3519 UI != UE; ++UI) { 3520 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3521 CXXRecordDecl *UnionFieldRecord = 3522 UnionFieldType->getAsCXXRecordDecl(); 3523 3524 if (!UnionFieldType.isConstQualified()) 3525 AllConst = false; 3526 3527 if (UnionFieldRecord && 3528 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3529 return true; 3530 } 3531 3532 if (AllConst) 3533 return true; 3534 3535 // Don't try to initialize the anonymous union 3536 // This is technically non-conformant, but sanity demands it. 3537 continue; 3538 } 3539 3540 // -- any non-static data member with no brace-or-equal-initializer has 3541 // class type M (or array thereof) and either M has no default 3542 // constructor or overload resolution as applied to M's default 3543 // constructor results in an ambiguity or in a function that is deleted 3544 // or inaccessible from the defaulted default constructor. 3545 if (!FI->hasInClassInitializer()) { 3546 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3547 if (!FieldDefault || FieldDefault->isDeleted()) 3548 return true; 3549 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3550 PDiag()) != AR_accessible) 3551 return true; 3552 } 3553 } else if (!Union && FieldType.isConstQualified() && 3554 !FI->hasInClassInitializer()) { 3555 // -- any non-variant non-static data member of const-qualified type (or 3556 // array thereof) with no brace-or-equal-initializer does not have a 3557 // user-provided default constructor 3558 return true; 3559 } 3560 } 3561 3562 if (Union && AllConst) 3563 return true; 3564 3565 return false; 3566} 3567 3568bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3569 CXXRecordDecl *RD = CD->getParent(); 3570 assert(!RD->isDependentType() && "do deletion after instantiation"); 3571 if (!LangOpts.CPlusPlus0x) 3572 return false; 3573 3574 SourceLocation Loc = CD->getLocation(); 3575 3576 // Do access control from the constructor 3577 ContextRAII CtorContext(*this, CD); 3578 3579 bool Union = RD->isUnion(); 3580 3581 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3582 "copy assignment arg has no pointee type"); 3583 unsigned ArgQuals = 3584 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3585 Qualifiers::Const : 0; 3586 3587 // We do this because we should never actually use an anonymous 3588 // union's constructor. 3589 if (Union && RD->isAnonymousStructOrUnion()) 3590 return false; 3591 3592 // FIXME: We should put some diagnostic logic right into this function. 3593 3594 // C++0x [class.copy]/11 3595 // A defaulted [copy] constructor for class X is defined as delete if X has: 3596 3597 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3598 BE = RD->bases_end(); 3599 BI != BE; ++BI) { 3600 // We'll handle this one later 3601 if (BI->isVirtual()) 3602 continue; 3603 3604 QualType BaseType = BI->getType(); 3605 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3606 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3607 3608 // -- any [direct base class] of a type with a destructor that is deleted or 3609 // inaccessible from the defaulted constructor 3610 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3611 if (BaseDtor->isDeleted()) 3612 return true; 3613 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3614 AR_accessible) 3615 return true; 3616 3617 // -- a [direct base class] B that cannot be [copied] because overload 3618 // resolution, as applied to B's [copy] constructor, results in an 3619 // ambiguity or a function that is deleted or inaccessible from the 3620 // defaulted constructor 3621 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3622 if (!BaseCtor || BaseCtor->isDeleted()) 3623 return true; 3624 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3625 AR_accessible) 3626 return true; 3627 } 3628 3629 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3630 BE = RD->vbases_end(); 3631 BI != BE; ++BI) { 3632 QualType BaseType = BI->getType(); 3633 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3634 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3635 3636 // -- any [virtual base class] of a type with a destructor that is deleted or 3637 // inaccessible from the defaulted constructor 3638 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3639 if (BaseDtor->isDeleted()) 3640 return true; 3641 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3642 AR_accessible) 3643 return true; 3644 3645 // -- a [virtual base class] B that cannot be [copied] because overload 3646 // resolution, as applied to B's [copy] constructor, results in an 3647 // ambiguity or a function that is deleted or inaccessible from the 3648 // defaulted constructor 3649 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3650 if (!BaseCtor || BaseCtor->isDeleted()) 3651 return true; 3652 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3653 AR_accessible) 3654 return true; 3655 } 3656 3657 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3658 FE = RD->field_end(); 3659 FI != FE; ++FI) { 3660 QualType FieldType = Context.getBaseElementType(FI->getType()); 3661 3662 // -- for a copy constructor, a non-static data member of rvalue reference 3663 // type 3664 if (FieldType->isRValueReferenceType()) 3665 return true; 3666 3667 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3668 3669 if (FieldRecord) { 3670 // This is an anonymous union 3671 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3672 // Anonymous unions inside unions do not variant members create 3673 if (!Union) { 3674 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3675 UE = FieldRecord->field_end(); 3676 UI != UE; ++UI) { 3677 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3678 CXXRecordDecl *UnionFieldRecord = 3679 UnionFieldType->getAsCXXRecordDecl(); 3680 3681 // -- a variant member with a non-trivial [copy] constructor and X 3682 // is a union-like class 3683 if (UnionFieldRecord && 3684 !UnionFieldRecord->hasTrivialCopyConstructor()) 3685 return true; 3686 } 3687 } 3688 3689 // Don't try to initalize an anonymous union 3690 continue; 3691 } else { 3692 // -- a variant member with a non-trivial [copy] constructor and X is a 3693 // union-like class 3694 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3695 return true; 3696 3697 // -- any [non-static data member] of a type with a destructor that is 3698 // deleted or inaccessible from the defaulted constructor 3699 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3700 if (FieldDtor->isDeleted()) 3701 return true; 3702 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3703 AR_accessible) 3704 return true; 3705 } 3706 3707 // -- a [non-static data member of class type (or array thereof)] B that 3708 // cannot be [copied] because overload resolution, as applied to B's 3709 // [copy] constructor, results in an ambiguity or a function that is 3710 // deleted or inaccessible from the defaulted constructor 3711 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3712 ArgQuals); 3713 if (!FieldCtor || FieldCtor->isDeleted()) 3714 return true; 3715 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3716 PDiag()) != AR_accessible) 3717 return true; 3718 } 3719 } 3720 3721 return false; 3722} 3723 3724bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3725 CXXRecordDecl *RD = MD->getParent(); 3726 assert(!RD->isDependentType() && "do deletion after instantiation"); 3727 if (!LangOpts.CPlusPlus0x) 3728 return false; 3729 3730 SourceLocation Loc = MD->getLocation(); 3731 3732 // Do access control from the constructor 3733 ContextRAII MethodContext(*this, MD); 3734 3735 bool Union = RD->isUnion(); 3736 3737 unsigned ArgQuals = 3738 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3739 Qualifiers::Const : 0; 3740 3741 // We do this because we should never actually use an anonymous 3742 // union's constructor. 3743 if (Union && RD->isAnonymousStructOrUnion()) 3744 return false; 3745 3746 // FIXME: We should put some diagnostic logic right into this function. 3747 3748 // C++0x [class.copy]/11 3749 // A defaulted [copy] assignment operator for class X is defined as deleted 3750 // if X has: 3751 3752 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3753 BE = RD->bases_end(); 3754 BI != BE; ++BI) { 3755 // We'll handle this one later 3756 if (BI->isVirtual()) 3757 continue; 3758 3759 QualType BaseType = BI->getType(); 3760 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3761 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3762 3763 // -- a [direct base class] B that cannot be [copied] because overload 3764 // resolution, as applied to B's [copy] assignment operator, results in 3765 // an ambiguity or a function that is deleted or inaccessible from the 3766 // assignment operator 3767 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3768 0); 3769 if (!CopyOper || CopyOper->isDeleted()) 3770 return true; 3771 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3772 return true; 3773 } 3774 3775 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3776 BE = RD->vbases_end(); 3777 BI != BE; ++BI) { 3778 QualType BaseType = BI->getType(); 3779 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3780 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3781 3782 // -- a [virtual base class] B that cannot be [copied] because overload 3783 // resolution, as applied to B's [copy] assignment operator, results in 3784 // an ambiguity or a function that is deleted or inaccessible from the 3785 // assignment operator 3786 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3787 0); 3788 if (!CopyOper || CopyOper->isDeleted()) 3789 return true; 3790 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3791 return true; 3792 } 3793 3794 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3795 FE = RD->field_end(); 3796 FI != FE; ++FI) { 3797 QualType FieldType = Context.getBaseElementType(FI->getType()); 3798 3799 // -- a non-static data member of reference type 3800 if (FieldType->isReferenceType()) 3801 return true; 3802 3803 // -- a non-static data member of const non-class type (or array thereof) 3804 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3805 return true; 3806 3807 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3808 3809 if (FieldRecord) { 3810 // This is an anonymous union 3811 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3812 // Anonymous unions inside unions do not variant members create 3813 if (!Union) { 3814 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3815 UE = FieldRecord->field_end(); 3816 UI != UE; ++UI) { 3817 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3818 CXXRecordDecl *UnionFieldRecord = 3819 UnionFieldType->getAsCXXRecordDecl(); 3820 3821 // -- a variant member with a non-trivial [copy] assignment operator 3822 // and X is a union-like class 3823 if (UnionFieldRecord && 3824 !UnionFieldRecord->hasTrivialCopyAssignment()) 3825 return true; 3826 } 3827 } 3828 3829 // Don't try to initalize an anonymous union 3830 continue; 3831 // -- a variant member with a non-trivial [copy] assignment operator 3832 // and X is a union-like class 3833 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3834 return true; 3835 } 3836 3837 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 3838 false, 0); 3839 if (!CopyOper || CopyOper->isDeleted()) 3840 return false; 3841 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3842 return false; 3843 } 3844 } 3845 3846 return false; 3847} 3848 3849bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3850 CXXRecordDecl *RD = DD->getParent(); 3851 assert(!RD->isDependentType() && "do deletion after instantiation"); 3852 if (!LangOpts.CPlusPlus0x) 3853 return false; 3854 3855 SourceLocation Loc = DD->getLocation(); 3856 3857 // Do access control from the destructor 3858 ContextRAII CtorContext(*this, DD); 3859 3860 bool Union = RD->isUnion(); 3861 3862 // We do this because we should never actually use an anonymous 3863 // union's destructor. 3864 if (Union && RD->isAnonymousStructOrUnion()) 3865 return false; 3866 3867 // C++0x [class.dtor]p5 3868 // A defaulted destructor for a class X is defined as deleted if: 3869 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3870 BE = RD->bases_end(); 3871 BI != BE; ++BI) { 3872 // We'll handle this one later 3873 if (BI->isVirtual()) 3874 continue; 3875 3876 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3877 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3878 assert(BaseDtor && "base has no destructor"); 3879 3880 // -- any direct or virtual base class has a deleted destructor or 3881 // a destructor that is inaccessible from the defaulted destructor 3882 if (BaseDtor->isDeleted()) 3883 return true; 3884 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3885 AR_accessible) 3886 return true; 3887 } 3888 3889 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3890 BE = RD->vbases_end(); 3891 BI != BE; ++BI) { 3892 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3893 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3894 assert(BaseDtor && "base has no destructor"); 3895 3896 // -- any direct or virtual base class has a deleted destructor or 3897 // a destructor that is inaccessible from the defaulted destructor 3898 if (BaseDtor->isDeleted()) 3899 return true; 3900 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3901 AR_accessible) 3902 return true; 3903 } 3904 3905 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3906 FE = RD->field_end(); 3907 FI != FE; ++FI) { 3908 QualType FieldType = Context.getBaseElementType(FI->getType()); 3909 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3910 if (FieldRecord) { 3911 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3912 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3913 UE = FieldRecord->field_end(); 3914 UI != UE; ++UI) { 3915 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3916 CXXRecordDecl *UnionFieldRecord = 3917 UnionFieldType->getAsCXXRecordDecl(); 3918 3919 // -- X is a union-like class that has a variant member with a non- 3920 // trivial destructor. 3921 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3922 return true; 3923 } 3924 // Technically we are supposed to do this next check unconditionally. 3925 // But that makes absolutely no sense. 3926 } else { 3927 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3928 3929 // -- any of the non-static data members has class type M (or array 3930 // thereof) and M has a deleted destructor or a destructor that is 3931 // inaccessible from the defaulted destructor 3932 if (FieldDtor->isDeleted()) 3933 return true; 3934 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3935 AR_accessible) 3936 return true; 3937 3938 // -- X is a union-like class that has a variant member with a non- 3939 // trivial destructor. 3940 if (Union && !FieldDtor->isTrivial()) 3941 return true; 3942 } 3943 } 3944 } 3945 3946 if (DD->isVirtual()) { 3947 FunctionDecl *OperatorDelete = 0; 3948 DeclarationName Name = 3949 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3950 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3951 false)) 3952 return true; 3953 } 3954 3955 3956 return false; 3957} 3958 3959/// \brief Data used with FindHiddenVirtualMethod 3960namespace { 3961 struct FindHiddenVirtualMethodData { 3962 Sema *S; 3963 CXXMethodDecl *Method; 3964 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3965 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3966 }; 3967} 3968 3969/// \brief Member lookup function that determines whether a given C++ 3970/// method overloads virtual methods in a base class without overriding any, 3971/// to be used with CXXRecordDecl::lookupInBases(). 3972static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3973 CXXBasePath &Path, 3974 void *UserData) { 3975 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3976 3977 FindHiddenVirtualMethodData &Data 3978 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3979 3980 DeclarationName Name = Data.Method->getDeclName(); 3981 assert(Name.getNameKind() == DeclarationName::Identifier); 3982 3983 bool foundSameNameMethod = false; 3984 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3985 for (Path.Decls = BaseRecord->lookup(Name); 3986 Path.Decls.first != Path.Decls.second; 3987 ++Path.Decls.first) { 3988 NamedDecl *D = *Path.Decls.first; 3989 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3990 MD = MD->getCanonicalDecl(); 3991 foundSameNameMethod = true; 3992 // Interested only in hidden virtual methods. 3993 if (!MD->isVirtual()) 3994 continue; 3995 // If the method we are checking overrides a method from its base 3996 // don't warn about the other overloaded methods. 3997 if (!Data.S->IsOverload(Data.Method, MD, false)) 3998 return true; 3999 // Collect the overload only if its hidden. 4000 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4001 overloadedMethods.push_back(MD); 4002 } 4003 } 4004 4005 if (foundSameNameMethod) 4006 Data.OverloadedMethods.append(overloadedMethods.begin(), 4007 overloadedMethods.end()); 4008 return foundSameNameMethod; 4009} 4010 4011/// \brief See if a method overloads virtual methods in a base class without 4012/// overriding any. 4013void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4014 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4015 MD->getLocation()) == Diagnostic::Ignored) 4016 return; 4017 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4018 return; 4019 4020 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4021 /*bool RecordPaths=*/false, 4022 /*bool DetectVirtual=*/false); 4023 FindHiddenVirtualMethodData Data; 4024 Data.Method = MD; 4025 Data.S = this; 4026 4027 // Keep the base methods that were overriden or introduced in the subclass 4028 // by 'using' in a set. A base method not in this set is hidden. 4029 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4030 res.first != res.second; ++res.first) { 4031 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4032 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4033 E = MD->end_overridden_methods(); 4034 I != E; ++I) 4035 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4036 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4037 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4038 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4039 } 4040 4041 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4042 !Data.OverloadedMethods.empty()) { 4043 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4044 << MD << (Data.OverloadedMethods.size() > 1); 4045 4046 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4047 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4048 Diag(overloadedMD->getLocation(), 4049 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4050 } 4051 } 4052} 4053 4054void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4055 Decl *TagDecl, 4056 SourceLocation LBrac, 4057 SourceLocation RBrac, 4058 AttributeList *AttrList) { 4059 if (!TagDecl) 4060 return; 4061 4062 AdjustDeclIfTemplate(TagDecl); 4063 4064 ActOnFields(S, RLoc, TagDecl, 4065 // strict aliasing violation! 4066 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4067 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4068 4069 CheckCompletedCXXClass( 4070 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4071} 4072 4073/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4074/// special functions, such as the default constructor, copy 4075/// constructor, or destructor, to the given C++ class (C++ 4076/// [special]p1). This routine can only be executed just before the 4077/// definition of the class is complete. 4078void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4079 if (!ClassDecl->hasUserDeclaredConstructor()) 4080 ++ASTContext::NumImplicitDefaultConstructors; 4081 4082 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4083 ++ASTContext::NumImplicitCopyConstructors; 4084 4085 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4086 ++ASTContext::NumImplicitCopyAssignmentOperators; 4087 4088 // If we have a dynamic class, then the copy assignment operator may be 4089 // virtual, so we have to declare it immediately. This ensures that, e.g., 4090 // it shows up in the right place in the vtable and that we diagnose 4091 // problems with the implicit exception specification. 4092 if (ClassDecl->isDynamicClass()) 4093 DeclareImplicitCopyAssignment(ClassDecl); 4094 } 4095 4096 if (!ClassDecl->hasUserDeclaredDestructor()) { 4097 ++ASTContext::NumImplicitDestructors; 4098 4099 // If we have a dynamic class, then the destructor may be virtual, so we 4100 // have to declare the destructor immediately. This ensures that, e.g., it 4101 // shows up in the right place in the vtable and that we diagnose problems 4102 // with the implicit exception specification. 4103 if (ClassDecl->isDynamicClass()) 4104 DeclareImplicitDestructor(ClassDecl); 4105 } 4106} 4107 4108void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4109 if (!D) 4110 return; 4111 4112 int NumParamList = D->getNumTemplateParameterLists(); 4113 for (int i = 0; i < NumParamList; i++) { 4114 TemplateParameterList* Params = D->getTemplateParameterList(i); 4115 for (TemplateParameterList::iterator Param = Params->begin(), 4116 ParamEnd = Params->end(); 4117 Param != ParamEnd; ++Param) { 4118 NamedDecl *Named = cast<NamedDecl>(*Param); 4119 if (Named->getDeclName()) { 4120 S->AddDecl(Named); 4121 IdResolver.AddDecl(Named); 4122 } 4123 } 4124 } 4125} 4126 4127void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4128 if (!D) 4129 return; 4130 4131 TemplateParameterList *Params = 0; 4132 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4133 Params = Template->getTemplateParameters(); 4134 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4135 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4136 Params = PartialSpec->getTemplateParameters(); 4137 else 4138 return; 4139 4140 for (TemplateParameterList::iterator Param = Params->begin(), 4141 ParamEnd = Params->end(); 4142 Param != ParamEnd; ++Param) { 4143 NamedDecl *Named = cast<NamedDecl>(*Param); 4144 if (Named->getDeclName()) { 4145 S->AddDecl(Named); 4146 IdResolver.AddDecl(Named); 4147 } 4148 } 4149} 4150 4151void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4152 if (!RecordD) return; 4153 AdjustDeclIfTemplate(RecordD); 4154 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4155 PushDeclContext(S, Record); 4156} 4157 4158void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4159 if (!RecordD) return; 4160 PopDeclContext(); 4161} 4162 4163/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4164/// parsing a top-level (non-nested) C++ class, and we are now 4165/// parsing those parts of the given Method declaration that could 4166/// not be parsed earlier (C++ [class.mem]p2), such as default 4167/// arguments. This action should enter the scope of the given 4168/// Method declaration as if we had just parsed the qualified method 4169/// name. However, it should not bring the parameters into scope; 4170/// that will be performed by ActOnDelayedCXXMethodParameter. 4171void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4172} 4173 4174/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4175/// C++ method declaration. We're (re-)introducing the given 4176/// function parameter into scope for use in parsing later parts of 4177/// the method declaration. For example, we could see an 4178/// ActOnParamDefaultArgument event for this parameter. 4179void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4180 if (!ParamD) 4181 return; 4182 4183 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4184 4185 // If this parameter has an unparsed default argument, clear it out 4186 // to make way for the parsed default argument. 4187 if (Param->hasUnparsedDefaultArg()) 4188 Param->setDefaultArg(0); 4189 4190 S->AddDecl(Param); 4191 if (Param->getDeclName()) 4192 IdResolver.AddDecl(Param); 4193} 4194 4195/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4196/// processing the delayed method declaration for Method. The method 4197/// declaration is now considered finished. There may be a separate 4198/// ActOnStartOfFunctionDef action later (not necessarily 4199/// immediately!) for this method, if it was also defined inside the 4200/// class body. 4201void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4202 if (!MethodD) 4203 return; 4204 4205 AdjustDeclIfTemplate(MethodD); 4206 4207 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4208 4209 // Now that we have our default arguments, check the constructor 4210 // again. It could produce additional diagnostics or affect whether 4211 // the class has implicitly-declared destructors, among other 4212 // things. 4213 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4214 CheckConstructor(Constructor); 4215 4216 // Check the default arguments, which we may have added. 4217 if (!Method->isInvalidDecl()) 4218 CheckCXXDefaultArguments(Method); 4219} 4220 4221/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4222/// the well-formedness of the constructor declarator @p D with type @p 4223/// R. If there are any errors in the declarator, this routine will 4224/// emit diagnostics and set the invalid bit to true. In any case, the type 4225/// will be updated to reflect a well-formed type for the constructor and 4226/// returned. 4227QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4228 StorageClass &SC) { 4229 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4230 4231 // C++ [class.ctor]p3: 4232 // A constructor shall not be virtual (10.3) or static (9.4). A 4233 // constructor can be invoked for a const, volatile or const 4234 // volatile object. A constructor shall not be declared const, 4235 // volatile, or const volatile (9.3.2). 4236 if (isVirtual) { 4237 if (!D.isInvalidType()) 4238 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4239 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4240 << SourceRange(D.getIdentifierLoc()); 4241 D.setInvalidType(); 4242 } 4243 if (SC == SC_Static) { 4244 if (!D.isInvalidType()) 4245 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4246 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4247 << SourceRange(D.getIdentifierLoc()); 4248 D.setInvalidType(); 4249 SC = SC_None; 4250 } 4251 4252 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4253 if (FTI.TypeQuals != 0) { 4254 if (FTI.TypeQuals & Qualifiers::Const) 4255 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4256 << "const" << SourceRange(D.getIdentifierLoc()); 4257 if (FTI.TypeQuals & Qualifiers::Volatile) 4258 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4259 << "volatile" << SourceRange(D.getIdentifierLoc()); 4260 if (FTI.TypeQuals & Qualifiers::Restrict) 4261 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4262 << "restrict" << SourceRange(D.getIdentifierLoc()); 4263 D.setInvalidType(); 4264 } 4265 4266 // C++0x [class.ctor]p4: 4267 // A constructor shall not be declared with a ref-qualifier. 4268 if (FTI.hasRefQualifier()) { 4269 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4270 << FTI.RefQualifierIsLValueRef 4271 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4272 D.setInvalidType(); 4273 } 4274 4275 // Rebuild the function type "R" without any type qualifiers (in 4276 // case any of the errors above fired) and with "void" as the 4277 // return type, since constructors don't have return types. 4278 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4279 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4280 return R; 4281 4282 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4283 EPI.TypeQuals = 0; 4284 EPI.RefQualifier = RQ_None; 4285 4286 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4287 Proto->getNumArgs(), EPI); 4288} 4289 4290/// CheckConstructor - Checks a fully-formed constructor for 4291/// well-formedness, issuing any diagnostics required. Returns true if 4292/// the constructor declarator is invalid. 4293void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4294 CXXRecordDecl *ClassDecl 4295 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4296 if (!ClassDecl) 4297 return Constructor->setInvalidDecl(); 4298 4299 // C++ [class.copy]p3: 4300 // A declaration of a constructor for a class X is ill-formed if 4301 // its first parameter is of type (optionally cv-qualified) X and 4302 // either there are no other parameters or else all other 4303 // parameters have default arguments. 4304 if (!Constructor->isInvalidDecl() && 4305 ((Constructor->getNumParams() == 1) || 4306 (Constructor->getNumParams() > 1 && 4307 Constructor->getParamDecl(1)->hasDefaultArg())) && 4308 Constructor->getTemplateSpecializationKind() 4309 != TSK_ImplicitInstantiation) { 4310 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4311 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4312 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4313 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4314 const char *ConstRef 4315 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4316 : " const &"; 4317 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4318 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4319 4320 // FIXME: Rather that making the constructor invalid, we should endeavor 4321 // to fix the type. 4322 Constructor->setInvalidDecl(); 4323 } 4324 } 4325} 4326 4327/// CheckDestructor - Checks a fully-formed destructor definition for 4328/// well-formedness, issuing any diagnostics required. Returns true 4329/// on error. 4330bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4331 CXXRecordDecl *RD = Destructor->getParent(); 4332 4333 if (Destructor->isVirtual()) { 4334 SourceLocation Loc; 4335 4336 if (!Destructor->isImplicit()) 4337 Loc = Destructor->getLocation(); 4338 else 4339 Loc = RD->getLocation(); 4340 4341 // If we have a virtual destructor, look up the deallocation function 4342 FunctionDecl *OperatorDelete = 0; 4343 DeclarationName Name = 4344 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4345 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4346 return true; 4347 4348 MarkDeclarationReferenced(Loc, OperatorDelete); 4349 4350 Destructor->setOperatorDelete(OperatorDelete); 4351 } 4352 4353 return false; 4354} 4355 4356static inline bool 4357FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4358 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4359 FTI.ArgInfo[0].Param && 4360 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4361} 4362 4363/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4364/// the well-formednes of the destructor declarator @p D with type @p 4365/// R. If there are any errors in the declarator, this routine will 4366/// emit diagnostics and set the declarator to invalid. Even if this happens, 4367/// will be updated to reflect a well-formed type for the destructor and 4368/// returned. 4369QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4370 StorageClass& SC) { 4371 // C++ [class.dtor]p1: 4372 // [...] A typedef-name that names a class is a class-name 4373 // (7.1.3); however, a typedef-name that names a class shall not 4374 // be used as the identifier in the declarator for a destructor 4375 // declaration. 4376 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4377 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4378 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4379 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4380 else if (const TemplateSpecializationType *TST = 4381 DeclaratorType->getAs<TemplateSpecializationType>()) 4382 if (TST->isTypeAlias()) 4383 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4384 << DeclaratorType << 1; 4385 4386 // C++ [class.dtor]p2: 4387 // A destructor is used to destroy objects of its class type. A 4388 // destructor takes no parameters, and no return type can be 4389 // specified for it (not even void). The address of a destructor 4390 // shall not be taken. A destructor shall not be static. A 4391 // destructor can be invoked for a const, volatile or const 4392 // volatile object. A destructor shall not be declared const, 4393 // volatile or const volatile (9.3.2). 4394 if (SC == SC_Static) { 4395 if (!D.isInvalidType()) 4396 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4397 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4398 << SourceRange(D.getIdentifierLoc()) 4399 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4400 4401 SC = SC_None; 4402 } 4403 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4404 // Destructors don't have return types, but the parser will 4405 // happily parse something like: 4406 // 4407 // class X { 4408 // float ~X(); 4409 // }; 4410 // 4411 // The return type will be eliminated later. 4412 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4413 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4414 << SourceRange(D.getIdentifierLoc()); 4415 } 4416 4417 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4418 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4419 if (FTI.TypeQuals & Qualifiers::Const) 4420 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4421 << "const" << SourceRange(D.getIdentifierLoc()); 4422 if (FTI.TypeQuals & Qualifiers::Volatile) 4423 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4424 << "volatile" << SourceRange(D.getIdentifierLoc()); 4425 if (FTI.TypeQuals & Qualifiers::Restrict) 4426 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4427 << "restrict" << SourceRange(D.getIdentifierLoc()); 4428 D.setInvalidType(); 4429 } 4430 4431 // C++0x [class.dtor]p2: 4432 // A destructor shall not be declared with a ref-qualifier. 4433 if (FTI.hasRefQualifier()) { 4434 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4435 << FTI.RefQualifierIsLValueRef 4436 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4437 D.setInvalidType(); 4438 } 4439 4440 // Make sure we don't have any parameters. 4441 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4442 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4443 4444 // Delete the parameters. 4445 FTI.freeArgs(); 4446 D.setInvalidType(); 4447 } 4448 4449 // Make sure the destructor isn't variadic. 4450 if (FTI.isVariadic) { 4451 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4452 D.setInvalidType(); 4453 } 4454 4455 // Rebuild the function type "R" without any type qualifiers or 4456 // parameters (in case any of the errors above fired) and with 4457 // "void" as the return type, since destructors don't have return 4458 // types. 4459 if (!D.isInvalidType()) 4460 return R; 4461 4462 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4463 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4464 EPI.Variadic = false; 4465 EPI.TypeQuals = 0; 4466 EPI.RefQualifier = RQ_None; 4467 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4468} 4469 4470/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4471/// well-formednes of the conversion function declarator @p D with 4472/// type @p R. If there are any errors in the declarator, this routine 4473/// will emit diagnostics and return true. Otherwise, it will return 4474/// false. Either way, the type @p R will be updated to reflect a 4475/// well-formed type for the conversion operator. 4476void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4477 StorageClass& SC) { 4478 // C++ [class.conv.fct]p1: 4479 // Neither parameter types nor return type can be specified. The 4480 // type of a conversion function (8.3.5) is "function taking no 4481 // parameter returning conversion-type-id." 4482 if (SC == SC_Static) { 4483 if (!D.isInvalidType()) 4484 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4485 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4486 << SourceRange(D.getIdentifierLoc()); 4487 D.setInvalidType(); 4488 SC = SC_None; 4489 } 4490 4491 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4492 4493 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4494 // Conversion functions don't have return types, but the parser will 4495 // happily parse something like: 4496 // 4497 // class X { 4498 // float operator bool(); 4499 // }; 4500 // 4501 // The return type will be changed later anyway. 4502 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4503 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4504 << SourceRange(D.getIdentifierLoc()); 4505 D.setInvalidType(); 4506 } 4507 4508 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4509 4510 // Make sure we don't have any parameters. 4511 if (Proto->getNumArgs() > 0) { 4512 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4513 4514 // Delete the parameters. 4515 D.getFunctionTypeInfo().freeArgs(); 4516 D.setInvalidType(); 4517 } else if (Proto->isVariadic()) { 4518 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4519 D.setInvalidType(); 4520 } 4521 4522 // Diagnose "&operator bool()" and other such nonsense. This 4523 // is actually a gcc extension which we don't support. 4524 if (Proto->getResultType() != ConvType) { 4525 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4526 << Proto->getResultType(); 4527 D.setInvalidType(); 4528 ConvType = Proto->getResultType(); 4529 } 4530 4531 // C++ [class.conv.fct]p4: 4532 // The conversion-type-id shall not represent a function type nor 4533 // an array type. 4534 if (ConvType->isArrayType()) { 4535 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4536 ConvType = Context.getPointerType(ConvType); 4537 D.setInvalidType(); 4538 } else if (ConvType->isFunctionType()) { 4539 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4540 ConvType = Context.getPointerType(ConvType); 4541 D.setInvalidType(); 4542 } 4543 4544 // Rebuild the function type "R" without any parameters (in case any 4545 // of the errors above fired) and with the conversion type as the 4546 // return type. 4547 if (D.isInvalidType()) 4548 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4549 4550 // C++0x explicit conversion operators. 4551 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4552 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4553 diag::warn_explicit_conversion_functions) 4554 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4555} 4556 4557/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4558/// the declaration of the given C++ conversion function. This routine 4559/// is responsible for recording the conversion function in the C++ 4560/// class, if possible. 4561Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4562 assert(Conversion && "Expected to receive a conversion function declaration"); 4563 4564 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4565 4566 // Make sure we aren't redeclaring the conversion function. 4567 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4568 4569 // C++ [class.conv.fct]p1: 4570 // [...] A conversion function is never used to convert a 4571 // (possibly cv-qualified) object to the (possibly cv-qualified) 4572 // same object type (or a reference to it), to a (possibly 4573 // cv-qualified) base class of that type (or a reference to it), 4574 // or to (possibly cv-qualified) void. 4575 // FIXME: Suppress this warning if the conversion function ends up being a 4576 // virtual function that overrides a virtual function in a base class. 4577 QualType ClassType 4578 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4579 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4580 ConvType = ConvTypeRef->getPointeeType(); 4581 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4582 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4583 /* Suppress diagnostics for instantiations. */; 4584 else if (ConvType->isRecordType()) { 4585 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4586 if (ConvType == ClassType) 4587 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4588 << ClassType; 4589 else if (IsDerivedFrom(ClassType, ConvType)) 4590 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4591 << ClassType << ConvType; 4592 } else if (ConvType->isVoidType()) { 4593 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4594 << ClassType << ConvType; 4595 } 4596 4597 if (FunctionTemplateDecl *ConversionTemplate 4598 = Conversion->getDescribedFunctionTemplate()) 4599 return ConversionTemplate; 4600 4601 return Conversion; 4602} 4603 4604//===----------------------------------------------------------------------===// 4605// Namespace Handling 4606//===----------------------------------------------------------------------===// 4607 4608 4609 4610/// ActOnStartNamespaceDef - This is called at the start of a namespace 4611/// definition. 4612Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4613 SourceLocation InlineLoc, 4614 SourceLocation NamespaceLoc, 4615 SourceLocation IdentLoc, 4616 IdentifierInfo *II, 4617 SourceLocation LBrace, 4618 AttributeList *AttrList) { 4619 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4620 // For anonymous namespace, take the location of the left brace. 4621 SourceLocation Loc = II ? IdentLoc : LBrace; 4622 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4623 StartLoc, Loc, II); 4624 Namespc->setInline(InlineLoc.isValid()); 4625 4626 Scope *DeclRegionScope = NamespcScope->getParent(); 4627 4628 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4629 4630 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4631 PushNamespaceVisibilityAttr(Attr); 4632 4633 if (II) { 4634 // C++ [namespace.def]p2: 4635 // The identifier in an original-namespace-definition shall not 4636 // have been previously defined in the declarative region in 4637 // which the original-namespace-definition appears. The 4638 // identifier in an original-namespace-definition is the name of 4639 // the namespace. Subsequently in that declarative region, it is 4640 // treated as an original-namespace-name. 4641 // 4642 // Since namespace names are unique in their scope, and we don't 4643 // look through using directives, just look for any ordinary names. 4644 4645 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4646 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4647 Decl::IDNS_Namespace; 4648 NamedDecl *PrevDecl = 0; 4649 for (DeclContext::lookup_result R 4650 = CurContext->getRedeclContext()->lookup(II); 4651 R.first != R.second; ++R.first) { 4652 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4653 PrevDecl = *R.first; 4654 break; 4655 } 4656 } 4657 4658 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4659 // This is an extended namespace definition. 4660 if (Namespc->isInline() != OrigNS->isInline()) { 4661 // inline-ness must match 4662 if (OrigNS->isInline()) { 4663 // The user probably just forgot the 'inline', so suggest that it 4664 // be added back. 4665 Diag(Namespc->getLocation(), 4666 diag::warn_inline_namespace_reopened_noninline) 4667 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4668 } else { 4669 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4670 << Namespc->isInline(); 4671 } 4672 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4673 4674 // Recover by ignoring the new namespace's inline status. 4675 Namespc->setInline(OrigNS->isInline()); 4676 } 4677 4678 // Attach this namespace decl to the chain of extended namespace 4679 // definitions. 4680 OrigNS->setNextNamespace(Namespc); 4681 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4682 4683 // Remove the previous declaration from the scope. 4684 if (DeclRegionScope->isDeclScope(OrigNS)) { 4685 IdResolver.RemoveDecl(OrigNS); 4686 DeclRegionScope->RemoveDecl(OrigNS); 4687 } 4688 } else if (PrevDecl) { 4689 // This is an invalid name redefinition. 4690 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4691 << Namespc->getDeclName(); 4692 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4693 Namespc->setInvalidDecl(); 4694 // Continue on to push Namespc as current DeclContext and return it. 4695 } else if (II->isStr("std") && 4696 CurContext->getRedeclContext()->isTranslationUnit()) { 4697 // This is the first "real" definition of the namespace "std", so update 4698 // our cache of the "std" namespace to point at this definition. 4699 if (NamespaceDecl *StdNS = getStdNamespace()) { 4700 // We had already defined a dummy namespace "std". Link this new 4701 // namespace definition to the dummy namespace "std". 4702 StdNS->setNextNamespace(Namespc); 4703 StdNS->setLocation(IdentLoc); 4704 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4705 } 4706 4707 // Make our StdNamespace cache point at the first real definition of the 4708 // "std" namespace. 4709 StdNamespace = Namespc; 4710 4711 // Add this instance of "std" to the set of known namespaces 4712 KnownNamespaces[Namespc] = false; 4713 } else if (!Namespc->isInline()) { 4714 // Since this is an "original" namespace, add it to the known set of 4715 // namespaces if it is not an inline namespace. 4716 KnownNamespaces[Namespc] = false; 4717 } 4718 4719 PushOnScopeChains(Namespc, DeclRegionScope); 4720 } else { 4721 // Anonymous namespaces. 4722 assert(Namespc->isAnonymousNamespace()); 4723 4724 // Link the anonymous namespace into its parent. 4725 NamespaceDecl *PrevDecl; 4726 DeclContext *Parent = CurContext->getRedeclContext(); 4727 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4728 PrevDecl = TU->getAnonymousNamespace(); 4729 TU->setAnonymousNamespace(Namespc); 4730 } else { 4731 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4732 PrevDecl = ND->getAnonymousNamespace(); 4733 ND->setAnonymousNamespace(Namespc); 4734 } 4735 4736 // Link the anonymous namespace with its previous declaration. 4737 if (PrevDecl) { 4738 assert(PrevDecl->isAnonymousNamespace()); 4739 assert(!PrevDecl->getNextNamespace()); 4740 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4741 PrevDecl->setNextNamespace(Namespc); 4742 4743 if (Namespc->isInline() != PrevDecl->isInline()) { 4744 // inline-ness must match 4745 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4746 << Namespc->isInline(); 4747 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4748 Namespc->setInvalidDecl(); 4749 // Recover by ignoring the new namespace's inline status. 4750 Namespc->setInline(PrevDecl->isInline()); 4751 } 4752 } 4753 4754 CurContext->addDecl(Namespc); 4755 4756 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4757 // behaves as if it were replaced by 4758 // namespace unique { /* empty body */ } 4759 // using namespace unique; 4760 // namespace unique { namespace-body } 4761 // where all occurrences of 'unique' in a translation unit are 4762 // replaced by the same identifier and this identifier differs 4763 // from all other identifiers in the entire program. 4764 4765 // We just create the namespace with an empty name and then add an 4766 // implicit using declaration, just like the standard suggests. 4767 // 4768 // CodeGen enforces the "universally unique" aspect by giving all 4769 // declarations semantically contained within an anonymous 4770 // namespace internal linkage. 4771 4772 if (!PrevDecl) { 4773 UsingDirectiveDecl* UD 4774 = UsingDirectiveDecl::Create(Context, CurContext, 4775 /* 'using' */ LBrace, 4776 /* 'namespace' */ SourceLocation(), 4777 /* qualifier */ NestedNameSpecifierLoc(), 4778 /* identifier */ SourceLocation(), 4779 Namespc, 4780 /* Ancestor */ CurContext); 4781 UD->setImplicit(); 4782 CurContext->addDecl(UD); 4783 } 4784 } 4785 4786 // Although we could have an invalid decl (i.e. the namespace name is a 4787 // redefinition), push it as current DeclContext and try to continue parsing. 4788 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4789 // for the namespace has the declarations that showed up in that particular 4790 // namespace definition. 4791 PushDeclContext(NamespcScope, Namespc); 4792 return Namespc; 4793} 4794 4795/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4796/// is a namespace alias, returns the namespace it points to. 4797static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4798 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4799 return AD->getNamespace(); 4800 return dyn_cast_or_null<NamespaceDecl>(D); 4801} 4802 4803/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4804/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4805void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4806 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4807 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4808 Namespc->setRBraceLoc(RBrace); 4809 PopDeclContext(); 4810 if (Namespc->hasAttr<VisibilityAttr>()) 4811 PopPragmaVisibility(); 4812} 4813 4814CXXRecordDecl *Sema::getStdBadAlloc() const { 4815 return cast_or_null<CXXRecordDecl>( 4816 StdBadAlloc.get(Context.getExternalSource())); 4817} 4818 4819NamespaceDecl *Sema::getStdNamespace() const { 4820 return cast_or_null<NamespaceDecl>( 4821 StdNamespace.get(Context.getExternalSource())); 4822} 4823 4824/// \brief Retrieve the special "std" namespace, which may require us to 4825/// implicitly define the namespace. 4826NamespaceDecl *Sema::getOrCreateStdNamespace() { 4827 if (!StdNamespace) { 4828 // The "std" namespace has not yet been defined, so build one implicitly. 4829 StdNamespace = NamespaceDecl::Create(Context, 4830 Context.getTranslationUnitDecl(), 4831 SourceLocation(), SourceLocation(), 4832 &PP.getIdentifierTable().get("std")); 4833 getStdNamespace()->setImplicit(true); 4834 } 4835 4836 return getStdNamespace(); 4837} 4838 4839/// \brief Determine whether a using statement is in a context where it will be 4840/// apply in all contexts. 4841static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4842 switch (CurContext->getDeclKind()) { 4843 case Decl::TranslationUnit: 4844 return true; 4845 case Decl::LinkageSpec: 4846 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4847 default: 4848 return false; 4849 } 4850} 4851 4852static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 4853 CXXScopeSpec &SS, 4854 SourceLocation IdentLoc, 4855 IdentifierInfo *Ident) { 4856 R.clear(); 4857 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 4858 R.getLookupKind(), Sc, &SS, NULL, 4859 false, S.CTC_NoKeywords, NULL)) { 4860 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 4861 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 4862 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 4863 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 4864 if (DeclContext *DC = S.computeDeclContext(SS, false)) 4865 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 4866 << Ident << DC << CorrectedQuotedStr << SS.getRange() 4867 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4868 else 4869 S.Diag(IdentLoc, diag::err_using_directive_suggest) 4870 << Ident << CorrectedQuotedStr 4871 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4872 4873 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 4874 diag::note_namespace_defined_here) << CorrectedQuotedStr; 4875 4876 Ident = Corrected.getCorrectionAsIdentifierInfo(); 4877 R.addDecl(Corrected.getCorrectionDecl()); 4878 return true; 4879 } 4880 R.setLookupName(Ident); 4881 } 4882 return false; 4883} 4884 4885Decl *Sema::ActOnUsingDirective(Scope *S, 4886 SourceLocation UsingLoc, 4887 SourceLocation NamespcLoc, 4888 CXXScopeSpec &SS, 4889 SourceLocation IdentLoc, 4890 IdentifierInfo *NamespcName, 4891 AttributeList *AttrList) { 4892 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4893 assert(NamespcName && "Invalid NamespcName."); 4894 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4895 4896 // This can only happen along a recovery path. 4897 while (S->getFlags() & Scope::TemplateParamScope) 4898 S = S->getParent(); 4899 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4900 4901 UsingDirectiveDecl *UDir = 0; 4902 NestedNameSpecifier *Qualifier = 0; 4903 if (SS.isSet()) 4904 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4905 4906 // Lookup namespace name. 4907 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4908 LookupParsedName(R, S, &SS); 4909 if (R.isAmbiguous()) 4910 return 0; 4911 4912 if (R.empty()) { 4913 R.clear(); 4914 // Allow "using namespace std;" or "using namespace ::std;" even if 4915 // "std" hasn't been defined yet, for GCC compatibility. 4916 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4917 NamespcName->isStr("std")) { 4918 Diag(IdentLoc, diag::ext_using_undefined_std); 4919 R.addDecl(getOrCreateStdNamespace()); 4920 R.resolveKind(); 4921 } 4922 // Otherwise, attempt typo correction. 4923 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 4924 } 4925 4926 if (!R.empty()) { 4927 NamedDecl *Named = R.getFoundDecl(); 4928 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4929 && "expected namespace decl"); 4930 // C++ [namespace.udir]p1: 4931 // A using-directive specifies that the names in the nominated 4932 // namespace can be used in the scope in which the 4933 // using-directive appears after the using-directive. During 4934 // unqualified name lookup (3.4.1), the names appear as if they 4935 // were declared in the nearest enclosing namespace which 4936 // contains both the using-directive and the nominated 4937 // namespace. [Note: in this context, "contains" means "contains 4938 // directly or indirectly". ] 4939 4940 // Find enclosing context containing both using-directive and 4941 // nominated namespace. 4942 NamespaceDecl *NS = getNamespaceDecl(Named); 4943 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4944 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4945 CommonAncestor = CommonAncestor->getParent(); 4946 4947 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4948 SS.getWithLocInContext(Context), 4949 IdentLoc, Named, CommonAncestor); 4950 4951 if (IsUsingDirectiveInToplevelContext(CurContext) && 4952 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4953 Diag(IdentLoc, diag::warn_using_directive_in_header); 4954 } 4955 4956 PushUsingDirective(S, UDir); 4957 } else { 4958 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4959 } 4960 4961 // FIXME: We ignore attributes for now. 4962 return UDir; 4963} 4964 4965void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4966 // If scope has associated entity, then using directive is at namespace 4967 // or translation unit scope. We add UsingDirectiveDecls, into 4968 // it's lookup structure. 4969 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4970 Ctx->addDecl(UDir); 4971 else 4972 // Otherwise it is block-sope. using-directives will affect lookup 4973 // only to the end of scope. 4974 S->PushUsingDirective(UDir); 4975} 4976 4977 4978Decl *Sema::ActOnUsingDeclaration(Scope *S, 4979 AccessSpecifier AS, 4980 bool HasUsingKeyword, 4981 SourceLocation UsingLoc, 4982 CXXScopeSpec &SS, 4983 UnqualifiedId &Name, 4984 AttributeList *AttrList, 4985 bool IsTypeName, 4986 SourceLocation TypenameLoc) { 4987 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4988 4989 switch (Name.getKind()) { 4990 case UnqualifiedId::IK_Identifier: 4991 case UnqualifiedId::IK_OperatorFunctionId: 4992 case UnqualifiedId::IK_LiteralOperatorId: 4993 case UnqualifiedId::IK_ConversionFunctionId: 4994 break; 4995 4996 case UnqualifiedId::IK_ConstructorName: 4997 case UnqualifiedId::IK_ConstructorTemplateId: 4998 // C++0x inherited constructors. 4999 if (getLangOptions().CPlusPlus0x) break; 5000 5001 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5002 << SS.getRange(); 5003 return 0; 5004 5005 case UnqualifiedId::IK_DestructorName: 5006 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5007 << SS.getRange(); 5008 return 0; 5009 5010 case UnqualifiedId::IK_TemplateId: 5011 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5012 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5013 return 0; 5014 } 5015 5016 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5017 DeclarationName TargetName = TargetNameInfo.getName(); 5018 if (!TargetName) 5019 return 0; 5020 5021 // Warn about using declarations. 5022 // TODO: store that the declaration was written without 'using' and 5023 // talk about access decls instead of using decls in the 5024 // diagnostics. 5025 if (!HasUsingKeyword) { 5026 UsingLoc = Name.getSourceRange().getBegin(); 5027 5028 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5029 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5030 } 5031 5032 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5033 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5034 return 0; 5035 5036 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5037 TargetNameInfo, AttrList, 5038 /* IsInstantiation */ false, 5039 IsTypeName, TypenameLoc); 5040 if (UD) 5041 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5042 5043 return UD; 5044} 5045 5046/// \brief Determine whether a using declaration considers the given 5047/// declarations as "equivalent", e.g., if they are redeclarations of 5048/// the same entity or are both typedefs of the same type. 5049static bool 5050IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5051 bool &SuppressRedeclaration) { 5052 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5053 SuppressRedeclaration = false; 5054 return true; 5055 } 5056 5057 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5058 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5059 SuppressRedeclaration = true; 5060 return Context.hasSameType(TD1->getUnderlyingType(), 5061 TD2->getUnderlyingType()); 5062 } 5063 5064 return false; 5065} 5066 5067 5068/// Determines whether to create a using shadow decl for a particular 5069/// decl, given the set of decls existing prior to this using lookup. 5070bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5071 const LookupResult &Previous) { 5072 // Diagnose finding a decl which is not from a base class of the 5073 // current class. We do this now because there are cases where this 5074 // function will silently decide not to build a shadow decl, which 5075 // will pre-empt further diagnostics. 5076 // 5077 // We don't need to do this in C++0x because we do the check once on 5078 // the qualifier. 5079 // 5080 // FIXME: diagnose the following if we care enough: 5081 // struct A { int foo; }; 5082 // struct B : A { using A::foo; }; 5083 // template <class T> struct C : A {}; 5084 // template <class T> struct D : C<T> { using B::foo; } // <--- 5085 // This is invalid (during instantiation) in C++03 because B::foo 5086 // resolves to the using decl in B, which is not a base class of D<T>. 5087 // We can't diagnose it immediately because C<T> is an unknown 5088 // specialization. The UsingShadowDecl in D<T> then points directly 5089 // to A::foo, which will look well-formed when we instantiate. 5090 // The right solution is to not collapse the shadow-decl chain. 5091 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5092 DeclContext *OrigDC = Orig->getDeclContext(); 5093 5094 // Handle enums and anonymous structs. 5095 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5096 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5097 while (OrigRec->isAnonymousStructOrUnion()) 5098 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5099 5100 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5101 if (OrigDC == CurContext) { 5102 Diag(Using->getLocation(), 5103 diag::err_using_decl_nested_name_specifier_is_current_class) 5104 << Using->getQualifierLoc().getSourceRange(); 5105 Diag(Orig->getLocation(), diag::note_using_decl_target); 5106 return true; 5107 } 5108 5109 Diag(Using->getQualifierLoc().getBeginLoc(), 5110 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5111 << Using->getQualifier() 5112 << cast<CXXRecordDecl>(CurContext) 5113 << Using->getQualifierLoc().getSourceRange(); 5114 Diag(Orig->getLocation(), diag::note_using_decl_target); 5115 return true; 5116 } 5117 } 5118 5119 if (Previous.empty()) return false; 5120 5121 NamedDecl *Target = Orig; 5122 if (isa<UsingShadowDecl>(Target)) 5123 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5124 5125 // If the target happens to be one of the previous declarations, we 5126 // don't have a conflict. 5127 // 5128 // FIXME: but we might be increasing its access, in which case we 5129 // should redeclare it. 5130 NamedDecl *NonTag = 0, *Tag = 0; 5131 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5132 I != E; ++I) { 5133 NamedDecl *D = (*I)->getUnderlyingDecl(); 5134 bool Result; 5135 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5136 return Result; 5137 5138 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5139 } 5140 5141 if (Target->isFunctionOrFunctionTemplate()) { 5142 FunctionDecl *FD; 5143 if (isa<FunctionTemplateDecl>(Target)) 5144 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5145 else 5146 FD = cast<FunctionDecl>(Target); 5147 5148 NamedDecl *OldDecl = 0; 5149 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5150 case Ovl_Overload: 5151 return false; 5152 5153 case Ovl_NonFunction: 5154 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5155 break; 5156 5157 // We found a decl with the exact signature. 5158 case Ovl_Match: 5159 // If we're in a record, we want to hide the target, so we 5160 // return true (without a diagnostic) to tell the caller not to 5161 // build a shadow decl. 5162 if (CurContext->isRecord()) 5163 return true; 5164 5165 // If we're not in a record, this is an error. 5166 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5167 break; 5168 } 5169 5170 Diag(Target->getLocation(), diag::note_using_decl_target); 5171 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5172 return true; 5173 } 5174 5175 // Target is not a function. 5176 5177 if (isa<TagDecl>(Target)) { 5178 // No conflict between a tag and a non-tag. 5179 if (!Tag) return false; 5180 5181 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5182 Diag(Target->getLocation(), diag::note_using_decl_target); 5183 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5184 return true; 5185 } 5186 5187 // No conflict between a tag and a non-tag. 5188 if (!NonTag) return false; 5189 5190 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5191 Diag(Target->getLocation(), diag::note_using_decl_target); 5192 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5193 return true; 5194} 5195 5196/// Builds a shadow declaration corresponding to a 'using' declaration. 5197UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5198 UsingDecl *UD, 5199 NamedDecl *Orig) { 5200 5201 // If we resolved to another shadow declaration, just coalesce them. 5202 NamedDecl *Target = Orig; 5203 if (isa<UsingShadowDecl>(Target)) { 5204 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5205 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5206 } 5207 5208 UsingShadowDecl *Shadow 5209 = UsingShadowDecl::Create(Context, CurContext, 5210 UD->getLocation(), UD, Target); 5211 UD->addShadowDecl(Shadow); 5212 5213 Shadow->setAccess(UD->getAccess()); 5214 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5215 Shadow->setInvalidDecl(); 5216 5217 if (S) 5218 PushOnScopeChains(Shadow, S); 5219 else 5220 CurContext->addDecl(Shadow); 5221 5222 5223 return Shadow; 5224} 5225 5226/// Hides a using shadow declaration. This is required by the current 5227/// using-decl implementation when a resolvable using declaration in a 5228/// class is followed by a declaration which would hide or override 5229/// one or more of the using decl's targets; for example: 5230/// 5231/// struct Base { void foo(int); }; 5232/// struct Derived : Base { 5233/// using Base::foo; 5234/// void foo(int); 5235/// }; 5236/// 5237/// The governing language is C++03 [namespace.udecl]p12: 5238/// 5239/// When a using-declaration brings names from a base class into a 5240/// derived class scope, member functions in the derived class 5241/// override and/or hide member functions with the same name and 5242/// parameter types in a base class (rather than conflicting). 5243/// 5244/// There are two ways to implement this: 5245/// (1) optimistically create shadow decls when they're not hidden 5246/// by existing declarations, or 5247/// (2) don't create any shadow decls (or at least don't make them 5248/// visible) until we've fully parsed/instantiated the class. 5249/// The problem with (1) is that we might have to retroactively remove 5250/// a shadow decl, which requires several O(n) operations because the 5251/// decl structures are (very reasonably) not designed for removal. 5252/// (2) avoids this but is very fiddly and phase-dependent. 5253void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5254 if (Shadow->getDeclName().getNameKind() == 5255 DeclarationName::CXXConversionFunctionName) 5256 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5257 5258 // Remove it from the DeclContext... 5259 Shadow->getDeclContext()->removeDecl(Shadow); 5260 5261 // ...and the scope, if applicable... 5262 if (S) { 5263 S->RemoveDecl(Shadow); 5264 IdResolver.RemoveDecl(Shadow); 5265 } 5266 5267 // ...and the using decl. 5268 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5269 5270 // TODO: complain somehow if Shadow was used. It shouldn't 5271 // be possible for this to happen, because...? 5272} 5273 5274/// Builds a using declaration. 5275/// 5276/// \param IsInstantiation - Whether this call arises from an 5277/// instantiation of an unresolved using declaration. We treat 5278/// the lookup differently for these declarations. 5279NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5280 SourceLocation UsingLoc, 5281 CXXScopeSpec &SS, 5282 const DeclarationNameInfo &NameInfo, 5283 AttributeList *AttrList, 5284 bool IsInstantiation, 5285 bool IsTypeName, 5286 SourceLocation TypenameLoc) { 5287 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5288 SourceLocation IdentLoc = NameInfo.getLoc(); 5289 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5290 5291 // FIXME: We ignore attributes for now. 5292 5293 if (SS.isEmpty()) { 5294 Diag(IdentLoc, diag::err_using_requires_qualname); 5295 return 0; 5296 } 5297 5298 // Do the redeclaration lookup in the current scope. 5299 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5300 ForRedeclaration); 5301 Previous.setHideTags(false); 5302 if (S) { 5303 LookupName(Previous, S); 5304 5305 // It is really dumb that we have to do this. 5306 LookupResult::Filter F = Previous.makeFilter(); 5307 while (F.hasNext()) { 5308 NamedDecl *D = F.next(); 5309 if (!isDeclInScope(D, CurContext, S)) 5310 F.erase(); 5311 } 5312 F.done(); 5313 } else { 5314 assert(IsInstantiation && "no scope in non-instantiation"); 5315 assert(CurContext->isRecord() && "scope not record in instantiation"); 5316 LookupQualifiedName(Previous, CurContext); 5317 } 5318 5319 // Check for invalid redeclarations. 5320 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5321 return 0; 5322 5323 // Check for bad qualifiers. 5324 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5325 return 0; 5326 5327 DeclContext *LookupContext = computeDeclContext(SS); 5328 NamedDecl *D; 5329 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5330 if (!LookupContext) { 5331 if (IsTypeName) { 5332 // FIXME: not all declaration name kinds are legal here 5333 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5334 UsingLoc, TypenameLoc, 5335 QualifierLoc, 5336 IdentLoc, NameInfo.getName()); 5337 } else { 5338 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5339 QualifierLoc, NameInfo); 5340 } 5341 } else { 5342 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5343 NameInfo, IsTypeName); 5344 } 5345 D->setAccess(AS); 5346 CurContext->addDecl(D); 5347 5348 if (!LookupContext) return D; 5349 UsingDecl *UD = cast<UsingDecl>(D); 5350 5351 if (RequireCompleteDeclContext(SS, LookupContext)) { 5352 UD->setInvalidDecl(); 5353 return UD; 5354 } 5355 5356 // Constructor inheriting using decls get special treatment. 5357 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5358 if (CheckInheritedConstructorUsingDecl(UD)) 5359 UD->setInvalidDecl(); 5360 return UD; 5361 } 5362 5363 // Otherwise, look up the target name. 5364 5365 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5366 R.setUsingDeclaration(true); 5367 5368 // Unlike most lookups, we don't always want to hide tag 5369 // declarations: tag names are visible through the using declaration 5370 // even if hidden by ordinary names, *except* in a dependent context 5371 // where it's important for the sanity of two-phase lookup. 5372 if (!IsInstantiation) 5373 R.setHideTags(false); 5374 5375 LookupQualifiedName(R, LookupContext); 5376 5377 if (R.empty()) { 5378 Diag(IdentLoc, diag::err_no_member) 5379 << NameInfo.getName() << LookupContext << SS.getRange(); 5380 UD->setInvalidDecl(); 5381 return UD; 5382 } 5383 5384 if (R.isAmbiguous()) { 5385 UD->setInvalidDecl(); 5386 return UD; 5387 } 5388 5389 if (IsTypeName) { 5390 // If we asked for a typename and got a non-type decl, error out. 5391 if (!R.getAsSingle<TypeDecl>()) { 5392 Diag(IdentLoc, diag::err_using_typename_non_type); 5393 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5394 Diag((*I)->getUnderlyingDecl()->getLocation(), 5395 diag::note_using_decl_target); 5396 UD->setInvalidDecl(); 5397 return UD; 5398 } 5399 } else { 5400 // If we asked for a non-typename and we got a type, error out, 5401 // but only if this is an instantiation of an unresolved using 5402 // decl. Otherwise just silently find the type name. 5403 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5404 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5405 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5406 UD->setInvalidDecl(); 5407 return UD; 5408 } 5409 } 5410 5411 // C++0x N2914 [namespace.udecl]p6: 5412 // A using-declaration shall not name a namespace. 5413 if (R.getAsSingle<NamespaceDecl>()) { 5414 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5415 << SS.getRange(); 5416 UD->setInvalidDecl(); 5417 return UD; 5418 } 5419 5420 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5421 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5422 BuildUsingShadowDecl(S, UD, *I); 5423 } 5424 5425 return UD; 5426} 5427 5428/// Additional checks for a using declaration referring to a constructor name. 5429bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5430 if (UD->isTypeName()) { 5431 // FIXME: Cannot specify typename when specifying constructor 5432 return true; 5433 } 5434 5435 const Type *SourceType = UD->getQualifier()->getAsType(); 5436 assert(SourceType && 5437 "Using decl naming constructor doesn't have type in scope spec."); 5438 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5439 5440 // Check whether the named type is a direct base class. 5441 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5442 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5443 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5444 BaseIt != BaseE; ++BaseIt) { 5445 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5446 if (CanonicalSourceType == BaseType) 5447 break; 5448 } 5449 5450 if (BaseIt == BaseE) { 5451 // Did not find SourceType in the bases. 5452 Diag(UD->getUsingLocation(), 5453 diag::err_using_decl_constructor_not_in_direct_base) 5454 << UD->getNameInfo().getSourceRange() 5455 << QualType(SourceType, 0) << TargetClass; 5456 return true; 5457 } 5458 5459 BaseIt->setInheritConstructors(); 5460 5461 return false; 5462} 5463 5464/// Checks that the given using declaration is not an invalid 5465/// redeclaration. Note that this is checking only for the using decl 5466/// itself, not for any ill-formedness among the UsingShadowDecls. 5467bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5468 bool isTypeName, 5469 const CXXScopeSpec &SS, 5470 SourceLocation NameLoc, 5471 const LookupResult &Prev) { 5472 // C++03 [namespace.udecl]p8: 5473 // C++0x [namespace.udecl]p10: 5474 // A using-declaration is a declaration and can therefore be used 5475 // repeatedly where (and only where) multiple declarations are 5476 // allowed. 5477 // 5478 // That's in non-member contexts. 5479 if (!CurContext->getRedeclContext()->isRecord()) 5480 return false; 5481 5482 NestedNameSpecifier *Qual 5483 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5484 5485 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5486 NamedDecl *D = *I; 5487 5488 bool DTypename; 5489 NestedNameSpecifier *DQual; 5490 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5491 DTypename = UD->isTypeName(); 5492 DQual = UD->getQualifier(); 5493 } else if (UnresolvedUsingValueDecl *UD 5494 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5495 DTypename = false; 5496 DQual = UD->getQualifier(); 5497 } else if (UnresolvedUsingTypenameDecl *UD 5498 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5499 DTypename = true; 5500 DQual = UD->getQualifier(); 5501 } else continue; 5502 5503 // using decls differ if one says 'typename' and the other doesn't. 5504 // FIXME: non-dependent using decls? 5505 if (isTypeName != DTypename) continue; 5506 5507 // using decls differ if they name different scopes (but note that 5508 // template instantiation can cause this check to trigger when it 5509 // didn't before instantiation). 5510 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5511 Context.getCanonicalNestedNameSpecifier(DQual)) 5512 continue; 5513 5514 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5515 Diag(D->getLocation(), diag::note_using_decl) << 1; 5516 return true; 5517 } 5518 5519 return false; 5520} 5521 5522 5523/// Checks that the given nested-name qualifier used in a using decl 5524/// in the current context is appropriately related to the current 5525/// scope. If an error is found, diagnoses it and returns true. 5526bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5527 const CXXScopeSpec &SS, 5528 SourceLocation NameLoc) { 5529 DeclContext *NamedContext = computeDeclContext(SS); 5530 5531 if (!CurContext->isRecord()) { 5532 // C++03 [namespace.udecl]p3: 5533 // C++0x [namespace.udecl]p8: 5534 // A using-declaration for a class member shall be a member-declaration. 5535 5536 // If we weren't able to compute a valid scope, it must be a 5537 // dependent class scope. 5538 if (!NamedContext || NamedContext->isRecord()) { 5539 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5540 << SS.getRange(); 5541 return true; 5542 } 5543 5544 // Otherwise, everything is known to be fine. 5545 return false; 5546 } 5547 5548 // The current scope is a record. 5549 5550 // If the named context is dependent, we can't decide much. 5551 if (!NamedContext) { 5552 // FIXME: in C++0x, we can diagnose if we can prove that the 5553 // nested-name-specifier does not refer to a base class, which is 5554 // still possible in some cases. 5555 5556 // Otherwise we have to conservatively report that things might be 5557 // okay. 5558 return false; 5559 } 5560 5561 if (!NamedContext->isRecord()) { 5562 // Ideally this would point at the last name in the specifier, 5563 // but we don't have that level of source info. 5564 Diag(SS.getRange().getBegin(), 5565 diag::err_using_decl_nested_name_specifier_is_not_class) 5566 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5567 return true; 5568 } 5569 5570 if (!NamedContext->isDependentContext() && 5571 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5572 return true; 5573 5574 if (getLangOptions().CPlusPlus0x) { 5575 // C++0x [namespace.udecl]p3: 5576 // In a using-declaration used as a member-declaration, the 5577 // nested-name-specifier shall name a base class of the class 5578 // being defined. 5579 5580 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5581 cast<CXXRecordDecl>(NamedContext))) { 5582 if (CurContext == NamedContext) { 5583 Diag(NameLoc, 5584 diag::err_using_decl_nested_name_specifier_is_current_class) 5585 << SS.getRange(); 5586 return true; 5587 } 5588 5589 Diag(SS.getRange().getBegin(), 5590 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5591 << (NestedNameSpecifier*) SS.getScopeRep() 5592 << cast<CXXRecordDecl>(CurContext) 5593 << SS.getRange(); 5594 return true; 5595 } 5596 5597 return false; 5598 } 5599 5600 // C++03 [namespace.udecl]p4: 5601 // A using-declaration used as a member-declaration shall refer 5602 // to a member of a base class of the class being defined [etc.]. 5603 5604 // Salient point: SS doesn't have to name a base class as long as 5605 // lookup only finds members from base classes. Therefore we can 5606 // diagnose here only if we can prove that that can't happen, 5607 // i.e. if the class hierarchies provably don't intersect. 5608 5609 // TODO: it would be nice if "definitely valid" results were cached 5610 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5611 // need to be repeated. 5612 5613 struct UserData { 5614 llvm::DenseSet<const CXXRecordDecl*> Bases; 5615 5616 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5617 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5618 Data->Bases.insert(Base); 5619 return true; 5620 } 5621 5622 bool hasDependentBases(const CXXRecordDecl *Class) { 5623 return !Class->forallBases(collect, this); 5624 } 5625 5626 /// Returns true if the base is dependent or is one of the 5627 /// accumulated base classes. 5628 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5629 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5630 return !Data->Bases.count(Base); 5631 } 5632 5633 bool mightShareBases(const CXXRecordDecl *Class) { 5634 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5635 } 5636 }; 5637 5638 UserData Data; 5639 5640 // Returns false if we find a dependent base. 5641 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5642 return false; 5643 5644 // Returns false if the class has a dependent base or if it or one 5645 // of its bases is present in the base set of the current context. 5646 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5647 return false; 5648 5649 Diag(SS.getRange().getBegin(), 5650 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5651 << (NestedNameSpecifier*) SS.getScopeRep() 5652 << cast<CXXRecordDecl>(CurContext) 5653 << SS.getRange(); 5654 5655 return true; 5656} 5657 5658Decl *Sema::ActOnAliasDeclaration(Scope *S, 5659 AccessSpecifier AS, 5660 MultiTemplateParamsArg TemplateParamLists, 5661 SourceLocation UsingLoc, 5662 UnqualifiedId &Name, 5663 TypeResult Type) { 5664 // Skip up to the relevant declaration scope. 5665 while (S->getFlags() & Scope::TemplateParamScope) 5666 S = S->getParent(); 5667 assert((S->getFlags() & Scope::DeclScope) && 5668 "got alias-declaration outside of declaration scope"); 5669 5670 if (Type.isInvalid()) 5671 return 0; 5672 5673 bool Invalid = false; 5674 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5675 TypeSourceInfo *TInfo = 0; 5676 GetTypeFromParser(Type.get(), &TInfo); 5677 5678 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5679 return 0; 5680 5681 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5682 UPPC_DeclarationType)) { 5683 Invalid = true; 5684 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5685 TInfo->getTypeLoc().getBeginLoc()); 5686 } 5687 5688 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5689 LookupName(Previous, S); 5690 5691 // Warn about shadowing the name of a template parameter. 5692 if (Previous.isSingleResult() && 5693 Previous.getFoundDecl()->isTemplateParameter()) { 5694 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5695 Previous.getFoundDecl())) 5696 Invalid = true; 5697 Previous.clear(); 5698 } 5699 5700 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5701 "name in alias declaration must be an identifier"); 5702 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5703 Name.StartLocation, 5704 Name.Identifier, TInfo); 5705 5706 NewTD->setAccess(AS); 5707 5708 if (Invalid) 5709 NewTD->setInvalidDecl(); 5710 5711 CheckTypedefForVariablyModifiedType(S, NewTD); 5712 Invalid |= NewTD->isInvalidDecl(); 5713 5714 bool Redeclaration = false; 5715 5716 NamedDecl *NewND; 5717 if (TemplateParamLists.size()) { 5718 TypeAliasTemplateDecl *OldDecl = 0; 5719 TemplateParameterList *OldTemplateParams = 0; 5720 5721 if (TemplateParamLists.size() != 1) { 5722 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5723 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5724 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5725 } 5726 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5727 5728 // Only consider previous declarations in the same scope. 5729 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5730 /*ExplicitInstantiationOrSpecialization*/false); 5731 if (!Previous.empty()) { 5732 Redeclaration = true; 5733 5734 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5735 if (!OldDecl && !Invalid) { 5736 Diag(UsingLoc, diag::err_redefinition_different_kind) 5737 << Name.Identifier; 5738 5739 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5740 if (OldD->getLocation().isValid()) 5741 Diag(OldD->getLocation(), diag::note_previous_definition); 5742 5743 Invalid = true; 5744 } 5745 5746 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5747 if (TemplateParameterListsAreEqual(TemplateParams, 5748 OldDecl->getTemplateParameters(), 5749 /*Complain=*/true, 5750 TPL_TemplateMatch)) 5751 OldTemplateParams = OldDecl->getTemplateParameters(); 5752 else 5753 Invalid = true; 5754 5755 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5756 if (!Invalid && 5757 !Context.hasSameType(OldTD->getUnderlyingType(), 5758 NewTD->getUnderlyingType())) { 5759 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5760 // but we can't reasonably accept it. 5761 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5762 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5763 if (OldTD->getLocation().isValid()) 5764 Diag(OldTD->getLocation(), diag::note_previous_definition); 5765 Invalid = true; 5766 } 5767 } 5768 } 5769 5770 // Merge any previous default template arguments into our parameters, 5771 // and check the parameter list. 5772 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5773 TPC_TypeAliasTemplate)) 5774 return 0; 5775 5776 TypeAliasTemplateDecl *NewDecl = 5777 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5778 Name.Identifier, TemplateParams, 5779 NewTD); 5780 5781 NewDecl->setAccess(AS); 5782 5783 if (Invalid) 5784 NewDecl->setInvalidDecl(); 5785 else if (OldDecl) 5786 NewDecl->setPreviousDeclaration(OldDecl); 5787 5788 NewND = NewDecl; 5789 } else { 5790 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5791 NewND = NewTD; 5792 } 5793 5794 if (!Redeclaration) 5795 PushOnScopeChains(NewND, S); 5796 5797 return NewND; 5798} 5799 5800Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5801 SourceLocation NamespaceLoc, 5802 SourceLocation AliasLoc, 5803 IdentifierInfo *Alias, 5804 CXXScopeSpec &SS, 5805 SourceLocation IdentLoc, 5806 IdentifierInfo *Ident) { 5807 5808 // Lookup the namespace name. 5809 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5810 LookupParsedName(R, S, &SS); 5811 5812 // Check if we have a previous declaration with the same name. 5813 NamedDecl *PrevDecl 5814 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5815 ForRedeclaration); 5816 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5817 PrevDecl = 0; 5818 5819 if (PrevDecl) { 5820 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5821 // We already have an alias with the same name that points to the same 5822 // namespace, so don't create a new one. 5823 // FIXME: At some point, we'll want to create the (redundant) 5824 // declaration to maintain better source information. 5825 if (!R.isAmbiguous() && !R.empty() && 5826 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5827 return 0; 5828 } 5829 5830 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5831 diag::err_redefinition_different_kind; 5832 Diag(AliasLoc, DiagID) << Alias; 5833 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5834 return 0; 5835 } 5836 5837 if (R.isAmbiguous()) 5838 return 0; 5839 5840 if (R.empty()) { 5841 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 5842 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5843 return 0; 5844 } 5845 } 5846 5847 NamespaceAliasDecl *AliasDecl = 5848 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5849 Alias, SS.getWithLocInContext(Context), 5850 IdentLoc, R.getFoundDecl()); 5851 5852 PushOnScopeChains(AliasDecl, S); 5853 return AliasDecl; 5854} 5855 5856namespace { 5857 /// \brief Scoped object used to handle the state changes required in Sema 5858 /// to implicitly define the body of a C++ member function; 5859 class ImplicitlyDefinedFunctionScope { 5860 Sema &S; 5861 Sema::ContextRAII SavedContext; 5862 5863 public: 5864 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5865 : S(S), SavedContext(S, Method) 5866 { 5867 S.PushFunctionScope(); 5868 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5869 } 5870 5871 ~ImplicitlyDefinedFunctionScope() { 5872 S.PopExpressionEvaluationContext(); 5873 S.PopFunctionOrBlockScope(); 5874 } 5875 }; 5876} 5877 5878Sema::ImplicitExceptionSpecification 5879Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5880 // C++ [except.spec]p14: 5881 // An implicitly declared special member function (Clause 12) shall have an 5882 // exception-specification. [...] 5883 ImplicitExceptionSpecification ExceptSpec(Context); 5884 5885 // Direct base-class constructors. 5886 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5887 BEnd = ClassDecl->bases_end(); 5888 B != BEnd; ++B) { 5889 if (B->isVirtual()) // Handled below. 5890 continue; 5891 5892 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5893 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5894 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5895 // If this is a deleted function, add it anyway. This might be conformant 5896 // with the standard. This might not. I'm not sure. It might not matter. 5897 if (Constructor) 5898 ExceptSpec.CalledDecl(Constructor); 5899 } 5900 } 5901 5902 // Virtual base-class constructors. 5903 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5904 BEnd = ClassDecl->vbases_end(); 5905 B != BEnd; ++B) { 5906 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5907 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5908 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5909 // If this is a deleted function, add it anyway. This might be conformant 5910 // with the standard. This might not. I'm not sure. It might not matter. 5911 if (Constructor) 5912 ExceptSpec.CalledDecl(Constructor); 5913 } 5914 } 5915 5916 // Field constructors. 5917 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5918 FEnd = ClassDecl->field_end(); 5919 F != FEnd; ++F) { 5920 if (F->hasInClassInitializer()) { 5921 if (Expr *E = F->getInClassInitializer()) 5922 ExceptSpec.CalledExpr(E); 5923 else if (!F->isInvalidDecl()) 5924 ExceptSpec.SetDelayed(); 5925 } else if (const RecordType *RecordTy 5926 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5927 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5928 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 5929 // If this is a deleted function, add it anyway. This might be conformant 5930 // with the standard. This might not. I'm not sure. It might not matter. 5931 // In particular, the problem is that this function never gets called. It 5932 // might just be ill-formed because this function attempts to refer to 5933 // a deleted function here. 5934 if (Constructor) 5935 ExceptSpec.CalledDecl(Constructor); 5936 } 5937 } 5938 5939 return ExceptSpec; 5940} 5941 5942CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5943 CXXRecordDecl *ClassDecl) { 5944 // C++ [class.ctor]p5: 5945 // A default constructor for a class X is a constructor of class X 5946 // that can be called without an argument. If there is no 5947 // user-declared constructor for class X, a default constructor is 5948 // implicitly declared. An implicitly-declared default constructor 5949 // is an inline public member of its class. 5950 assert(!ClassDecl->hasUserDeclaredConstructor() && 5951 "Should not build implicit default constructor!"); 5952 5953 ImplicitExceptionSpecification Spec = 5954 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5955 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5956 5957 // Create the actual constructor declaration. 5958 CanQualType ClassType 5959 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5960 SourceLocation ClassLoc = ClassDecl->getLocation(); 5961 DeclarationName Name 5962 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5963 DeclarationNameInfo NameInfo(Name, ClassLoc); 5964 CXXConstructorDecl *DefaultCon 5965 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5966 Context.getFunctionType(Context.VoidTy, 5967 0, 0, EPI), 5968 /*TInfo=*/0, 5969 /*isExplicit=*/false, 5970 /*isInline=*/true, 5971 /*isImplicitlyDeclared=*/true); 5972 DefaultCon->setAccess(AS_public); 5973 DefaultCon->setDefaulted(); 5974 DefaultCon->setImplicit(); 5975 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5976 5977 // Note that we have declared this constructor. 5978 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5979 5980 if (Scope *S = getScopeForContext(ClassDecl)) 5981 PushOnScopeChains(DefaultCon, S, false); 5982 ClassDecl->addDecl(DefaultCon); 5983 5984 if (ShouldDeleteDefaultConstructor(DefaultCon)) 5985 DefaultCon->setDeletedAsWritten(); 5986 5987 return DefaultCon; 5988} 5989 5990void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5991 CXXConstructorDecl *Constructor) { 5992 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 5993 !Constructor->doesThisDeclarationHaveABody() && 5994 !Constructor->isDeleted()) && 5995 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5996 5997 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5998 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5999 6000 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6001 DiagnosticErrorTrap Trap(Diags); 6002 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6003 Trap.hasErrorOccurred()) { 6004 Diag(CurrentLocation, diag::note_member_synthesized_at) 6005 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6006 Constructor->setInvalidDecl(); 6007 return; 6008 } 6009 6010 SourceLocation Loc = Constructor->getLocation(); 6011 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6012 6013 Constructor->setUsed(); 6014 MarkVTableUsed(CurrentLocation, ClassDecl); 6015 6016 if (ASTMutationListener *L = getASTMutationListener()) { 6017 L->CompletedImplicitDefinition(Constructor); 6018 } 6019} 6020 6021/// Get any existing defaulted default constructor for the given class. Do not 6022/// implicitly define one if it does not exist. 6023static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6024 CXXRecordDecl *D) { 6025 ASTContext &Context = Self.Context; 6026 QualType ClassType = Context.getTypeDeclType(D); 6027 DeclarationName ConstructorName 6028 = Context.DeclarationNames.getCXXConstructorName( 6029 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6030 6031 DeclContext::lookup_const_iterator Con, ConEnd; 6032 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6033 Con != ConEnd; ++Con) { 6034 // A function template cannot be defaulted. 6035 if (isa<FunctionTemplateDecl>(*Con)) 6036 continue; 6037 6038 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6039 if (Constructor->isDefaultConstructor()) 6040 return Constructor->isDefaulted() ? Constructor : 0; 6041 } 6042 return 0; 6043} 6044 6045void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6046 if (!D) return; 6047 AdjustDeclIfTemplate(D); 6048 6049 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6050 CXXConstructorDecl *CtorDecl 6051 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6052 6053 if (!CtorDecl) return; 6054 6055 // Compute the exception specification for the default constructor. 6056 const FunctionProtoType *CtorTy = 6057 CtorDecl->getType()->castAs<FunctionProtoType>(); 6058 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6059 ImplicitExceptionSpecification Spec = 6060 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6061 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6062 assert(EPI.ExceptionSpecType != EST_Delayed); 6063 6064 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6065 } 6066 6067 // If the default constructor is explicitly defaulted, checking the exception 6068 // specification is deferred until now. 6069 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6070 !ClassDecl->isDependentType()) 6071 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6072} 6073 6074void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6075 // We start with an initial pass over the base classes to collect those that 6076 // inherit constructors from. If there are none, we can forgo all further 6077 // processing. 6078 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6079 BasesVector BasesToInheritFrom; 6080 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6081 BaseE = ClassDecl->bases_end(); 6082 BaseIt != BaseE; ++BaseIt) { 6083 if (BaseIt->getInheritConstructors()) { 6084 QualType Base = BaseIt->getType(); 6085 if (Base->isDependentType()) { 6086 // If we inherit constructors from anything that is dependent, just 6087 // abort processing altogether. We'll get another chance for the 6088 // instantiations. 6089 return; 6090 } 6091 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6092 } 6093 } 6094 if (BasesToInheritFrom.empty()) 6095 return; 6096 6097 // Now collect the constructors that we already have in the current class. 6098 // Those take precedence over inherited constructors. 6099 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6100 // unless there is a user-declared constructor with the same signature in 6101 // the class where the using-declaration appears. 6102 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6103 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6104 CtorE = ClassDecl->ctor_end(); 6105 CtorIt != CtorE; ++CtorIt) { 6106 ExistingConstructors.insert( 6107 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6108 } 6109 6110 Scope *S = getScopeForContext(ClassDecl); 6111 DeclarationName CreatedCtorName = 6112 Context.DeclarationNames.getCXXConstructorName( 6113 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6114 6115 // Now comes the true work. 6116 // First, we keep a map from constructor types to the base that introduced 6117 // them. Needed for finding conflicting constructors. We also keep the 6118 // actually inserted declarations in there, for pretty diagnostics. 6119 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6120 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6121 ConstructorToSourceMap InheritedConstructors; 6122 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6123 BaseE = BasesToInheritFrom.end(); 6124 BaseIt != BaseE; ++BaseIt) { 6125 const RecordType *Base = *BaseIt; 6126 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6127 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6128 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6129 CtorE = BaseDecl->ctor_end(); 6130 CtorIt != CtorE; ++CtorIt) { 6131 // Find the using declaration for inheriting this base's constructors. 6132 DeclarationName Name = 6133 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6134 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6135 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6136 SourceLocation UsingLoc = UD ? UD->getLocation() : 6137 ClassDecl->getLocation(); 6138 6139 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6140 // from the class X named in the using-declaration consists of actual 6141 // constructors and notional constructors that result from the 6142 // transformation of defaulted parameters as follows: 6143 // - all non-template default constructors of X, and 6144 // - for each non-template constructor of X that has at least one 6145 // parameter with a default argument, the set of constructors that 6146 // results from omitting any ellipsis parameter specification and 6147 // successively omitting parameters with a default argument from the 6148 // end of the parameter-type-list. 6149 CXXConstructorDecl *BaseCtor = *CtorIt; 6150 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6151 const FunctionProtoType *BaseCtorType = 6152 BaseCtor->getType()->getAs<FunctionProtoType>(); 6153 6154 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6155 maxParams = BaseCtor->getNumParams(); 6156 params <= maxParams; ++params) { 6157 // Skip default constructors. They're never inherited. 6158 if (params == 0) 6159 continue; 6160 // Skip copy and move constructors for the same reason. 6161 if (CanBeCopyOrMove && params == 1) 6162 continue; 6163 6164 // Build up a function type for this particular constructor. 6165 // FIXME: The working paper does not consider that the exception spec 6166 // for the inheriting constructor might be larger than that of the 6167 // source. This code doesn't yet, either. When it does, this code will 6168 // need to be delayed until after exception specifications and in-class 6169 // member initializers are attached. 6170 const Type *NewCtorType; 6171 if (params == maxParams) 6172 NewCtorType = BaseCtorType; 6173 else { 6174 llvm::SmallVector<QualType, 16> Args; 6175 for (unsigned i = 0; i < params; ++i) { 6176 Args.push_back(BaseCtorType->getArgType(i)); 6177 } 6178 FunctionProtoType::ExtProtoInfo ExtInfo = 6179 BaseCtorType->getExtProtoInfo(); 6180 ExtInfo.Variadic = false; 6181 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6182 Args.data(), params, ExtInfo) 6183 .getTypePtr(); 6184 } 6185 const Type *CanonicalNewCtorType = 6186 Context.getCanonicalType(NewCtorType); 6187 6188 // Now that we have the type, first check if the class already has a 6189 // constructor with this signature. 6190 if (ExistingConstructors.count(CanonicalNewCtorType)) 6191 continue; 6192 6193 // Then we check if we have already declared an inherited constructor 6194 // with this signature. 6195 std::pair<ConstructorToSourceMap::iterator, bool> result = 6196 InheritedConstructors.insert(std::make_pair( 6197 CanonicalNewCtorType, 6198 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6199 if (!result.second) { 6200 // Already in the map. If it came from a different class, that's an 6201 // error. Not if it's from the same. 6202 CanQualType PreviousBase = result.first->second.first; 6203 if (CanonicalBase != PreviousBase) { 6204 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6205 const CXXConstructorDecl *PrevBaseCtor = 6206 PrevCtor->getInheritedConstructor(); 6207 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6208 6209 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6210 Diag(BaseCtor->getLocation(), 6211 diag::note_using_decl_constructor_conflict_current_ctor); 6212 Diag(PrevBaseCtor->getLocation(), 6213 diag::note_using_decl_constructor_conflict_previous_ctor); 6214 Diag(PrevCtor->getLocation(), 6215 diag::note_using_decl_constructor_conflict_previous_using); 6216 } 6217 continue; 6218 } 6219 6220 // OK, we're there, now add the constructor. 6221 // C++0x [class.inhctor]p8: [...] that would be performed by a 6222 // user-writtern inline constructor [...] 6223 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6224 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6225 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6226 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6227 /*ImplicitlyDeclared=*/true); 6228 NewCtor->setAccess(BaseCtor->getAccess()); 6229 6230 // Build up the parameter decls and add them. 6231 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6232 for (unsigned i = 0; i < params; ++i) { 6233 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6234 UsingLoc, UsingLoc, 6235 /*IdentifierInfo=*/0, 6236 BaseCtorType->getArgType(i), 6237 /*TInfo=*/0, SC_None, 6238 SC_None, /*DefaultArg=*/0)); 6239 } 6240 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6241 NewCtor->setInheritedConstructor(BaseCtor); 6242 6243 PushOnScopeChains(NewCtor, S, false); 6244 ClassDecl->addDecl(NewCtor); 6245 result.first->second.second = NewCtor; 6246 } 6247 } 6248 } 6249} 6250 6251Sema::ImplicitExceptionSpecification 6252Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6253 // C++ [except.spec]p14: 6254 // An implicitly declared special member function (Clause 12) shall have 6255 // an exception-specification. 6256 ImplicitExceptionSpecification ExceptSpec(Context); 6257 6258 // Direct base-class destructors. 6259 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6260 BEnd = ClassDecl->bases_end(); 6261 B != BEnd; ++B) { 6262 if (B->isVirtual()) // Handled below. 6263 continue; 6264 6265 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6266 ExceptSpec.CalledDecl( 6267 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6268 } 6269 6270 // Virtual base-class destructors. 6271 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6272 BEnd = ClassDecl->vbases_end(); 6273 B != BEnd; ++B) { 6274 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6275 ExceptSpec.CalledDecl( 6276 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6277 } 6278 6279 // Field destructors. 6280 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6281 FEnd = ClassDecl->field_end(); 6282 F != FEnd; ++F) { 6283 if (const RecordType *RecordTy 6284 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6285 ExceptSpec.CalledDecl( 6286 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6287 } 6288 6289 return ExceptSpec; 6290} 6291 6292CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6293 // C++ [class.dtor]p2: 6294 // If a class has no user-declared destructor, a destructor is 6295 // declared implicitly. An implicitly-declared destructor is an 6296 // inline public member of its class. 6297 6298 ImplicitExceptionSpecification Spec = 6299 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6300 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6301 6302 // Create the actual destructor declaration. 6303 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6304 6305 CanQualType ClassType 6306 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6307 SourceLocation ClassLoc = ClassDecl->getLocation(); 6308 DeclarationName Name 6309 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6310 DeclarationNameInfo NameInfo(Name, ClassLoc); 6311 CXXDestructorDecl *Destructor 6312 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6313 /*isInline=*/true, 6314 /*isImplicitlyDeclared=*/true); 6315 Destructor->setAccess(AS_public); 6316 Destructor->setDefaulted(); 6317 Destructor->setImplicit(); 6318 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6319 6320 // Note that we have declared this destructor. 6321 ++ASTContext::NumImplicitDestructorsDeclared; 6322 6323 // Introduce this destructor into its scope. 6324 if (Scope *S = getScopeForContext(ClassDecl)) 6325 PushOnScopeChains(Destructor, S, false); 6326 ClassDecl->addDecl(Destructor); 6327 6328 // This could be uniqued if it ever proves significant. 6329 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6330 6331 if (ShouldDeleteDestructor(Destructor)) 6332 Destructor->setDeletedAsWritten(); 6333 6334 AddOverriddenMethods(ClassDecl, Destructor); 6335 6336 return Destructor; 6337} 6338 6339void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6340 CXXDestructorDecl *Destructor) { 6341 assert((Destructor->isDefaulted() && 6342 !Destructor->doesThisDeclarationHaveABody()) && 6343 "DefineImplicitDestructor - call it for implicit default dtor"); 6344 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6345 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6346 6347 if (Destructor->isInvalidDecl()) 6348 return; 6349 6350 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6351 6352 DiagnosticErrorTrap Trap(Diags); 6353 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6354 Destructor->getParent()); 6355 6356 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6357 Diag(CurrentLocation, diag::note_member_synthesized_at) 6358 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6359 6360 Destructor->setInvalidDecl(); 6361 return; 6362 } 6363 6364 SourceLocation Loc = Destructor->getLocation(); 6365 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6366 6367 Destructor->setUsed(); 6368 MarkVTableUsed(CurrentLocation, ClassDecl); 6369 6370 if (ASTMutationListener *L = getASTMutationListener()) { 6371 L->CompletedImplicitDefinition(Destructor); 6372 } 6373} 6374 6375void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6376 CXXDestructorDecl *destructor) { 6377 // C++11 [class.dtor]p3: 6378 // A declaration of a destructor that does not have an exception- 6379 // specification is implicitly considered to have the same exception- 6380 // specification as an implicit declaration. 6381 const FunctionProtoType *dtorType = destructor->getType()-> 6382 getAs<FunctionProtoType>(); 6383 if (dtorType->hasExceptionSpec()) 6384 return; 6385 6386 ImplicitExceptionSpecification exceptSpec = 6387 ComputeDefaultedDtorExceptionSpec(classDecl); 6388 6389 // Replace the destructor's type. 6390 FunctionProtoType::ExtProtoInfo epi; 6391 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6392 epi.NumExceptions = exceptSpec.size(); 6393 epi.Exceptions = exceptSpec.data(); 6394 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6395 6396 destructor->setType(ty); 6397 6398 // FIXME: If the destructor has a body that could throw, and the newly created 6399 // spec doesn't allow exceptions, we should emit a warning, because this 6400 // change in behavior can break conforming C++03 programs at runtime. 6401 // However, we don't have a body yet, so it needs to be done somewhere else. 6402} 6403 6404/// \brief Builds a statement that copies the given entity from \p From to 6405/// \c To. 6406/// 6407/// This routine is used to copy the members of a class with an 6408/// implicitly-declared copy assignment operator. When the entities being 6409/// copied are arrays, this routine builds for loops to copy them. 6410/// 6411/// \param S The Sema object used for type-checking. 6412/// 6413/// \param Loc The location where the implicit copy is being generated. 6414/// 6415/// \param T The type of the expressions being copied. Both expressions must 6416/// have this type. 6417/// 6418/// \param To The expression we are copying to. 6419/// 6420/// \param From The expression we are copying from. 6421/// 6422/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6423/// Otherwise, it's a non-static member subobject. 6424/// 6425/// \param Depth Internal parameter recording the depth of the recursion. 6426/// 6427/// \returns A statement or a loop that copies the expressions. 6428static StmtResult 6429BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6430 Expr *To, Expr *From, 6431 bool CopyingBaseSubobject, unsigned Depth = 0) { 6432 // C++0x [class.copy]p30: 6433 // Each subobject is assigned in the manner appropriate to its type: 6434 // 6435 // - if the subobject is of class type, the copy assignment operator 6436 // for the class is used (as if by explicit qualification; that is, 6437 // ignoring any possible virtual overriding functions in more derived 6438 // classes); 6439 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6440 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6441 6442 // Look for operator=. 6443 DeclarationName Name 6444 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6445 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6446 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6447 6448 // Filter out any result that isn't a copy-assignment operator. 6449 LookupResult::Filter F = OpLookup.makeFilter(); 6450 while (F.hasNext()) { 6451 NamedDecl *D = F.next(); 6452 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6453 if (Method->isCopyAssignmentOperator()) 6454 continue; 6455 6456 F.erase(); 6457 } 6458 F.done(); 6459 6460 // Suppress the protected check (C++ [class.protected]) for each of the 6461 // assignment operators we found. This strange dance is required when 6462 // we're assigning via a base classes's copy-assignment operator. To 6463 // ensure that we're getting the right base class subobject (without 6464 // ambiguities), we need to cast "this" to that subobject type; to 6465 // ensure that we don't go through the virtual call mechanism, we need 6466 // to qualify the operator= name with the base class (see below). However, 6467 // this means that if the base class has a protected copy assignment 6468 // operator, the protected member access check will fail. So, we 6469 // rewrite "protected" access to "public" access in this case, since we 6470 // know by construction that we're calling from a derived class. 6471 if (CopyingBaseSubobject) { 6472 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6473 L != LEnd; ++L) { 6474 if (L.getAccess() == AS_protected) 6475 L.setAccess(AS_public); 6476 } 6477 } 6478 6479 // Create the nested-name-specifier that will be used to qualify the 6480 // reference to operator=; this is required to suppress the virtual 6481 // call mechanism. 6482 CXXScopeSpec SS; 6483 SS.MakeTrivial(S.Context, 6484 NestedNameSpecifier::Create(S.Context, 0, false, 6485 T.getTypePtr()), 6486 Loc); 6487 6488 // Create the reference to operator=. 6489 ExprResult OpEqualRef 6490 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6491 /*FirstQualifierInScope=*/0, OpLookup, 6492 /*TemplateArgs=*/0, 6493 /*SuppressQualifierCheck=*/true); 6494 if (OpEqualRef.isInvalid()) 6495 return StmtError(); 6496 6497 // Build the call to the assignment operator. 6498 6499 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6500 OpEqualRef.takeAs<Expr>(), 6501 Loc, &From, 1, Loc); 6502 if (Call.isInvalid()) 6503 return StmtError(); 6504 6505 return S.Owned(Call.takeAs<Stmt>()); 6506 } 6507 6508 // - if the subobject is of scalar type, the built-in assignment 6509 // operator is used. 6510 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6511 if (!ArrayTy) { 6512 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6513 if (Assignment.isInvalid()) 6514 return StmtError(); 6515 6516 return S.Owned(Assignment.takeAs<Stmt>()); 6517 } 6518 6519 // - if the subobject is an array, each element is assigned, in the 6520 // manner appropriate to the element type; 6521 6522 // Construct a loop over the array bounds, e.g., 6523 // 6524 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6525 // 6526 // that will copy each of the array elements. 6527 QualType SizeType = S.Context.getSizeType(); 6528 6529 // Create the iteration variable. 6530 IdentifierInfo *IterationVarName = 0; 6531 { 6532 llvm::SmallString<8> Str; 6533 llvm::raw_svector_ostream OS(Str); 6534 OS << "__i" << Depth; 6535 IterationVarName = &S.Context.Idents.get(OS.str()); 6536 } 6537 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6538 IterationVarName, SizeType, 6539 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6540 SC_None, SC_None); 6541 6542 // Initialize the iteration variable to zero. 6543 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6544 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6545 6546 // Create a reference to the iteration variable; we'll use this several 6547 // times throughout. 6548 Expr *IterationVarRef 6549 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6550 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6551 6552 // Create the DeclStmt that holds the iteration variable. 6553 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6554 6555 // Create the comparison against the array bound. 6556 llvm::APInt Upper 6557 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6558 Expr *Comparison 6559 = new (S.Context) BinaryOperator(IterationVarRef, 6560 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6561 BO_NE, S.Context.BoolTy, 6562 VK_RValue, OK_Ordinary, Loc); 6563 6564 // Create the pre-increment of the iteration variable. 6565 Expr *Increment 6566 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6567 VK_LValue, OK_Ordinary, Loc); 6568 6569 // Subscript the "from" and "to" expressions with the iteration variable. 6570 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6571 IterationVarRef, Loc)); 6572 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6573 IterationVarRef, Loc)); 6574 6575 // Build the copy for an individual element of the array. 6576 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6577 To, From, CopyingBaseSubobject, 6578 Depth + 1); 6579 if (Copy.isInvalid()) 6580 return StmtError(); 6581 6582 // Construct the loop that copies all elements of this array. 6583 return S.ActOnForStmt(Loc, Loc, InitStmt, 6584 S.MakeFullExpr(Comparison), 6585 0, S.MakeFullExpr(Increment), 6586 Loc, Copy.take()); 6587} 6588 6589std::pair<Sema::ImplicitExceptionSpecification, bool> 6590Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6591 CXXRecordDecl *ClassDecl) { 6592 // C++ [class.copy]p10: 6593 // If the class definition does not explicitly declare a copy 6594 // assignment operator, one is declared implicitly. 6595 // The implicitly-defined copy assignment operator for a class X 6596 // will have the form 6597 // 6598 // X& X::operator=(const X&) 6599 // 6600 // if 6601 bool HasConstCopyAssignment = true; 6602 6603 // -- each direct base class B of X has a copy assignment operator 6604 // whose parameter is of type const B&, const volatile B& or B, 6605 // and 6606 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6607 BaseEnd = ClassDecl->bases_end(); 6608 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6609 // We'll handle this below 6610 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 6611 continue; 6612 6613 assert(!Base->getType()->isDependentType() && 6614 "Cannot generate implicit members for class with dependent bases."); 6615 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6616 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6617 &HasConstCopyAssignment); 6618 } 6619 6620 // In C++0x, the above citation has "or virtual added" 6621 if (LangOpts.CPlusPlus0x) { 6622 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6623 BaseEnd = ClassDecl->vbases_end(); 6624 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6625 assert(!Base->getType()->isDependentType() && 6626 "Cannot generate implicit members for class with dependent bases."); 6627 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6628 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6629 &HasConstCopyAssignment); 6630 } 6631 } 6632 6633 // -- for all the nonstatic data members of X that are of a class 6634 // type M (or array thereof), each such class type has a copy 6635 // assignment operator whose parameter is of type const M&, 6636 // const volatile M& or M. 6637 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6638 FieldEnd = ClassDecl->field_end(); 6639 HasConstCopyAssignment && Field != FieldEnd; 6640 ++Field) { 6641 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6642 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6643 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 6644 &HasConstCopyAssignment); 6645 } 6646 } 6647 6648 // Otherwise, the implicitly declared copy assignment operator will 6649 // have the form 6650 // 6651 // X& X::operator=(X&) 6652 6653 // C++ [except.spec]p14: 6654 // An implicitly declared special member function (Clause 12) shall have an 6655 // exception-specification. [...] 6656 6657 // It is unspecified whether or not an implicit copy assignment operator 6658 // attempts to deduplicate calls to assignment operators of virtual bases are 6659 // made. As such, this exception specification is effectively unspecified. 6660 // Based on a similar decision made for constness in C++0x, we're erring on 6661 // the side of assuming such calls to be made regardless of whether they 6662 // actually happen. 6663 ImplicitExceptionSpecification ExceptSpec(Context); 6664 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 6665 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6666 BaseEnd = ClassDecl->bases_end(); 6667 Base != BaseEnd; ++Base) { 6668 if (Base->isVirtual()) 6669 continue; 6670 6671 CXXRecordDecl *BaseClassDecl 6672 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6673 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6674 ArgQuals, false, 0)) 6675 ExceptSpec.CalledDecl(CopyAssign); 6676 } 6677 6678 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6679 BaseEnd = ClassDecl->vbases_end(); 6680 Base != BaseEnd; ++Base) { 6681 CXXRecordDecl *BaseClassDecl 6682 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6683 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6684 ArgQuals, false, 0)) 6685 ExceptSpec.CalledDecl(CopyAssign); 6686 } 6687 6688 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6689 FieldEnd = ClassDecl->field_end(); 6690 Field != FieldEnd; 6691 ++Field) { 6692 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6693 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6694 if (CXXMethodDecl *CopyAssign = 6695 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 6696 ExceptSpec.CalledDecl(CopyAssign); 6697 } 6698 } 6699 6700 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6701} 6702 6703CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6704 // Note: The following rules are largely analoguous to the copy 6705 // constructor rules. Note that virtual bases are not taken into account 6706 // for determining the argument type of the operator. Note also that 6707 // operators taking an object instead of a reference are allowed. 6708 6709 ImplicitExceptionSpecification Spec(Context); 6710 bool Const; 6711 llvm::tie(Spec, Const) = 6712 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6713 6714 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6715 QualType RetType = Context.getLValueReferenceType(ArgType); 6716 if (Const) 6717 ArgType = ArgType.withConst(); 6718 ArgType = Context.getLValueReferenceType(ArgType); 6719 6720 // An implicitly-declared copy assignment operator is an inline public 6721 // member of its class. 6722 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6723 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6724 SourceLocation ClassLoc = ClassDecl->getLocation(); 6725 DeclarationNameInfo NameInfo(Name, ClassLoc); 6726 CXXMethodDecl *CopyAssignment 6727 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6728 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6729 /*TInfo=*/0, /*isStatic=*/false, 6730 /*StorageClassAsWritten=*/SC_None, 6731 /*isInline=*/true, 6732 SourceLocation()); 6733 CopyAssignment->setAccess(AS_public); 6734 CopyAssignment->setDefaulted(); 6735 CopyAssignment->setImplicit(); 6736 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6737 6738 // Add the parameter to the operator. 6739 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6740 ClassLoc, ClassLoc, /*Id=*/0, 6741 ArgType, /*TInfo=*/0, 6742 SC_None, 6743 SC_None, 0); 6744 CopyAssignment->setParams(&FromParam, 1); 6745 6746 // Note that we have added this copy-assignment operator. 6747 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6748 6749 if (Scope *S = getScopeForContext(ClassDecl)) 6750 PushOnScopeChains(CopyAssignment, S, false); 6751 ClassDecl->addDecl(CopyAssignment); 6752 6753 // C++0x [class.copy]p18: 6754 // ... If the class definition declares a move constructor or move 6755 // assignment operator, the implicitly declared copy assignment operator is 6756 // defined as deleted; ... 6757 if (ClassDecl->hasUserDeclaredMoveConstructor() || 6758 ClassDecl->hasUserDeclaredMoveAssignment() || 6759 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6760 CopyAssignment->setDeletedAsWritten(); 6761 6762 AddOverriddenMethods(ClassDecl, CopyAssignment); 6763 return CopyAssignment; 6764} 6765 6766void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6767 CXXMethodDecl *CopyAssignOperator) { 6768 assert((CopyAssignOperator->isDefaulted() && 6769 CopyAssignOperator->isOverloadedOperator() && 6770 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6771 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6772 "DefineImplicitCopyAssignment called for wrong function"); 6773 6774 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6775 6776 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6777 CopyAssignOperator->setInvalidDecl(); 6778 return; 6779 } 6780 6781 CopyAssignOperator->setUsed(); 6782 6783 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6784 DiagnosticErrorTrap Trap(Diags); 6785 6786 // C++0x [class.copy]p30: 6787 // The implicitly-defined or explicitly-defaulted copy assignment operator 6788 // for a non-union class X performs memberwise copy assignment of its 6789 // subobjects. The direct base classes of X are assigned first, in the 6790 // order of their declaration in the base-specifier-list, and then the 6791 // immediate non-static data members of X are assigned, in the order in 6792 // which they were declared in the class definition. 6793 6794 // The statements that form the synthesized function body. 6795 ASTOwningVector<Stmt*> Statements(*this); 6796 6797 // The parameter for the "other" object, which we are copying from. 6798 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6799 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6800 QualType OtherRefType = Other->getType(); 6801 if (const LValueReferenceType *OtherRef 6802 = OtherRefType->getAs<LValueReferenceType>()) { 6803 OtherRefType = OtherRef->getPointeeType(); 6804 OtherQuals = OtherRefType.getQualifiers(); 6805 } 6806 6807 // Our location for everything implicitly-generated. 6808 SourceLocation Loc = CopyAssignOperator->getLocation(); 6809 6810 // Construct a reference to the "other" object. We'll be using this 6811 // throughout the generated ASTs. 6812 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6813 assert(OtherRef && "Reference to parameter cannot fail!"); 6814 6815 // Construct the "this" pointer. We'll be using this throughout the generated 6816 // ASTs. 6817 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6818 assert(This && "Reference to this cannot fail!"); 6819 6820 // Assign base classes. 6821 bool Invalid = false; 6822 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6823 E = ClassDecl->bases_end(); Base != E; ++Base) { 6824 // Form the assignment: 6825 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6826 QualType BaseType = Base->getType().getUnqualifiedType(); 6827 if (!BaseType->isRecordType()) { 6828 Invalid = true; 6829 continue; 6830 } 6831 6832 CXXCastPath BasePath; 6833 BasePath.push_back(Base); 6834 6835 // Construct the "from" expression, which is an implicit cast to the 6836 // appropriately-qualified base type. 6837 Expr *From = OtherRef; 6838 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6839 CK_UncheckedDerivedToBase, 6840 VK_LValue, &BasePath).take(); 6841 6842 // Dereference "this". 6843 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6844 6845 // Implicitly cast "this" to the appropriately-qualified base type. 6846 To = ImpCastExprToType(To.take(), 6847 Context.getCVRQualifiedType(BaseType, 6848 CopyAssignOperator->getTypeQualifiers()), 6849 CK_UncheckedDerivedToBase, 6850 VK_LValue, &BasePath); 6851 6852 // Build the copy. 6853 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6854 To.get(), From, 6855 /*CopyingBaseSubobject=*/true); 6856 if (Copy.isInvalid()) { 6857 Diag(CurrentLocation, diag::note_member_synthesized_at) 6858 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6859 CopyAssignOperator->setInvalidDecl(); 6860 return; 6861 } 6862 6863 // Success! Record the copy. 6864 Statements.push_back(Copy.takeAs<Expr>()); 6865 } 6866 6867 // \brief Reference to the __builtin_memcpy function. 6868 Expr *BuiltinMemCpyRef = 0; 6869 // \brief Reference to the __builtin_objc_memmove_collectable function. 6870 Expr *CollectableMemCpyRef = 0; 6871 6872 // Assign non-static members. 6873 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6874 FieldEnd = ClassDecl->field_end(); 6875 Field != FieldEnd; ++Field) { 6876 // Check for members of reference type; we can't copy those. 6877 if (Field->getType()->isReferenceType()) { 6878 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6879 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6880 Diag(Field->getLocation(), diag::note_declared_at); 6881 Diag(CurrentLocation, diag::note_member_synthesized_at) 6882 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6883 Invalid = true; 6884 continue; 6885 } 6886 6887 // Check for members of const-qualified, non-class type. 6888 QualType BaseType = Context.getBaseElementType(Field->getType()); 6889 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6890 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6891 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6892 Diag(Field->getLocation(), diag::note_declared_at); 6893 Diag(CurrentLocation, diag::note_member_synthesized_at) 6894 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6895 Invalid = true; 6896 continue; 6897 } 6898 6899 // Suppress assigning zero-width bitfields. 6900 if (const Expr *Width = Field->getBitWidth()) 6901 if (Width->EvaluateAsInt(Context) == 0) 6902 continue; 6903 6904 QualType FieldType = Field->getType().getNonReferenceType(); 6905 if (FieldType->isIncompleteArrayType()) { 6906 assert(ClassDecl->hasFlexibleArrayMember() && 6907 "Incomplete array type is not valid"); 6908 continue; 6909 } 6910 6911 // Build references to the field in the object we're copying from and to. 6912 CXXScopeSpec SS; // Intentionally empty 6913 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6914 LookupMemberName); 6915 MemberLookup.addDecl(*Field); 6916 MemberLookup.resolveKind(); 6917 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6918 Loc, /*IsArrow=*/false, 6919 SS, 0, MemberLookup, 0); 6920 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6921 Loc, /*IsArrow=*/true, 6922 SS, 0, MemberLookup, 0); 6923 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6924 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6925 6926 // If the field should be copied with __builtin_memcpy rather than via 6927 // explicit assignments, do so. This optimization only applies for arrays 6928 // of scalars and arrays of class type with trivial copy-assignment 6929 // operators. 6930 if (FieldType->isArrayType() && 6931 BaseType.hasTrivialCopyAssignment(Context)) { 6932 // Compute the size of the memory buffer to be copied. 6933 QualType SizeType = Context.getSizeType(); 6934 llvm::APInt Size(Context.getTypeSize(SizeType), 6935 Context.getTypeSizeInChars(BaseType).getQuantity()); 6936 for (const ConstantArrayType *Array 6937 = Context.getAsConstantArrayType(FieldType); 6938 Array; 6939 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6940 llvm::APInt ArraySize 6941 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6942 Size *= ArraySize; 6943 } 6944 6945 // Take the address of the field references for "from" and "to". 6946 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6947 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6948 6949 bool NeedsCollectableMemCpy = 6950 (BaseType->isRecordType() && 6951 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6952 6953 if (NeedsCollectableMemCpy) { 6954 if (!CollectableMemCpyRef) { 6955 // Create a reference to the __builtin_objc_memmove_collectable function. 6956 LookupResult R(*this, 6957 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6958 Loc, LookupOrdinaryName); 6959 LookupName(R, TUScope, true); 6960 6961 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6962 if (!CollectableMemCpy) { 6963 // Something went horribly wrong earlier, and we will have 6964 // complained about it. 6965 Invalid = true; 6966 continue; 6967 } 6968 6969 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6970 CollectableMemCpy->getType(), 6971 VK_LValue, Loc, 0).take(); 6972 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6973 } 6974 } 6975 // Create a reference to the __builtin_memcpy builtin function. 6976 else if (!BuiltinMemCpyRef) { 6977 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6978 LookupOrdinaryName); 6979 LookupName(R, TUScope, true); 6980 6981 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6982 if (!BuiltinMemCpy) { 6983 // Something went horribly wrong earlier, and we will have complained 6984 // about it. 6985 Invalid = true; 6986 continue; 6987 } 6988 6989 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6990 BuiltinMemCpy->getType(), 6991 VK_LValue, Loc, 0).take(); 6992 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6993 } 6994 6995 ASTOwningVector<Expr*> CallArgs(*this); 6996 CallArgs.push_back(To.takeAs<Expr>()); 6997 CallArgs.push_back(From.takeAs<Expr>()); 6998 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6999 ExprResult Call = ExprError(); 7000 if (NeedsCollectableMemCpy) 7001 Call = ActOnCallExpr(/*Scope=*/0, 7002 CollectableMemCpyRef, 7003 Loc, move_arg(CallArgs), 7004 Loc); 7005 else 7006 Call = ActOnCallExpr(/*Scope=*/0, 7007 BuiltinMemCpyRef, 7008 Loc, move_arg(CallArgs), 7009 Loc); 7010 7011 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7012 Statements.push_back(Call.takeAs<Expr>()); 7013 continue; 7014 } 7015 7016 // Build the copy of this field. 7017 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7018 To.get(), From.get(), 7019 /*CopyingBaseSubobject=*/false); 7020 if (Copy.isInvalid()) { 7021 Diag(CurrentLocation, diag::note_member_synthesized_at) 7022 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7023 CopyAssignOperator->setInvalidDecl(); 7024 return; 7025 } 7026 7027 // Success! Record the copy. 7028 Statements.push_back(Copy.takeAs<Stmt>()); 7029 } 7030 7031 if (!Invalid) { 7032 // Add a "return *this;" 7033 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7034 7035 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7036 if (Return.isInvalid()) 7037 Invalid = true; 7038 else { 7039 Statements.push_back(Return.takeAs<Stmt>()); 7040 7041 if (Trap.hasErrorOccurred()) { 7042 Diag(CurrentLocation, diag::note_member_synthesized_at) 7043 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7044 Invalid = true; 7045 } 7046 } 7047 } 7048 7049 if (Invalid) { 7050 CopyAssignOperator->setInvalidDecl(); 7051 return; 7052 } 7053 7054 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7055 /*isStmtExpr=*/false); 7056 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7057 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7058 7059 if (ASTMutationListener *L = getASTMutationListener()) { 7060 L->CompletedImplicitDefinition(CopyAssignOperator); 7061 } 7062} 7063 7064std::pair<Sema::ImplicitExceptionSpecification, bool> 7065Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7066 // C++ [class.copy]p5: 7067 // The implicitly-declared copy constructor for a class X will 7068 // have the form 7069 // 7070 // X::X(const X&) 7071 // 7072 // if 7073 // FIXME: It ought to be possible to store this on the record. 7074 bool HasConstCopyConstructor = true; 7075 7076 // -- each direct or virtual base class B of X has a copy 7077 // constructor whose first parameter is of type const B& or 7078 // const volatile B&, and 7079 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7080 BaseEnd = ClassDecl->bases_end(); 7081 HasConstCopyConstructor && Base != BaseEnd; 7082 ++Base) { 7083 // Virtual bases are handled below. 7084 if (Base->isVirtual()) 7085 continue; 7086 7087 CXXRecordDecl *BaseClassDecl 7088 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7089 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7090 &HasConstCopyConstructor); 7091 } 7092 7093 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7094 BaseEnd = ClassDecl->vbases_end(); 7095 HasConstCopyConstructor && Base != BaseEnd; 7096 ++Base) { 7097 CXXRecordDecl *BaseClassDecl 7098 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7099 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7100 &HasConstCopyConstructor); 7101 } 7102 7103 // -- for all the nonstatic data members of X that are of a 7104 // class type M (or array thereof), each such class type 7105 // has a copy constructor whose first parameter is of type 7106 // const M& or const volatile M&. 7107 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7108 FieldEnd = ClassDecl->field_end(); 7109 HasConstCopyConstructor && Field != FieldEnd; 7110 ++Field) { 7111 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7112 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7113 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 7114 &HasConstCopyConstructor); 7115 } 7116 } 7117 // Otherwise, the implicitly declared copy constructor will have 7118 // the form 7119 // 7120 // X::X(X&) 7121 7122 // C++ [except.spec]p14: 7123 // An implicitly declared special member function (Clause 12) shall have an 7124 // exception-specification. [...] 7125 ImplicitExceptionSpecification ExceptSpec(Context); 7126 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7127 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7128 BaseEnd = ClassDecl->bases_end(); 7129 Base != BaseEnd; 7130 ++Base) { 7131 // Virtual bases are handled below. 7132 if (Base->isVirtual()) 7133 continue; 7134 7135 CXXRecordDecl *BaseClassDecl 7136 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7137 if (CXXConstructorDecl *CopyConstructor = 7138 LookupCopyingConstructor(BaseClassDecl, Quals)) 7139 ExceptSpec.CalledDecl(CopyConstructor); 7140 } 7141 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7142 BaseEnd = ClassDecl->vbases_end(); 7143 Base != BaseEnd; 7144 ++Base) { 7145 CXXRecordDecl *BaseClassDecl 7146 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7147 if (CXXConstructorDecl *CopyConstructor = 7148 LookupCopyingConstructor(BaseClassDecl, Quals)) 7149 ExceptSpec.CalledDecl(CopyConstructor); 7150 } 7151 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7152 FieldEnd = ClassDecl->field_end(); 7153 Field != FieldEnd; 7154 ++Field) { 7155 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7156 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7157 if (CXXConstructorDecl *CopyConstructor = 7158 LookupCopyingConstructor(FieldClassDecl, Quals)) 7159 ExceptSpec.CalledDecl(CopyConstructor); 7160 } 7161 } 7162 7163 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7164} 7165 7166CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7167 CXXRecordDecl *ClassDecl) { 7168 // C++ [class.copy]p4: 7169 // If the class definition does not explicitly declare a copy 7170 // constructor, one is declared implicitly. 7171 7172 ImplicitExceptionSpecification Spec(Context); 7173 bool Const; 7174 llvm::tie(Spec, Const) = 7175 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7176 7177 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7178 QualType ArgType = ClassType; 7179 if (Const) 7180 ArgType = ArgType.withConst(); 7181 ArgType = Context.getLValueReferenceType(ArgType); 7182 7183 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7184 7185 DeclarationName Name 7186 = Context.DeclarationNames.getCXXConstructorName( 7187 Context.getCanonicalType(ClassType)); 7188 SourceLocation ClassLoc = ClassDecl->getLocation(); 7189 DeclarationNameInfo NameInfo(Name, ClassLoc); 7190 7191 // An implicitly-declared copy constructor is an inline public 7192 // member of its class. 7193 CXXConstructorDecl *CopyConstructor 7194 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7195 Context.getFunctionType(Context.VoidTy, 7196 &ArgType, 1, EPI), 7197 /*TInfo=*/0, 7198 /*isExplicit=*/false, 7199 /*isInline=*/true, 7200 /*isImplicitlyDeclared=*/true); 7201 CopyConstructor->setAccess(AS_public); 7202 CopyConstructor->setDefaulted(); 7203 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7204 7205 // Note that we have declared this constructor. 7206 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7207 7208 // Add the parameter to the constructor. 7209 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7210 ClassLoc, ClassLoc, 7211 /*IdentifierInfo=*/0, 7212 ArgType, /*TInfo=*/0, 7213 SC_None, 7214 SC_None, 0); 7215 CopyConstructor->setParams(&FromParam, 1); 7216 7217 if (Scope *S = getScopeForContext(ClassDecl)) 7218 PushOnScopeChains(CopyConstructor, S, false); 7219 ClassDecl->addDecl(CopyConstructor); 7220 7221 // C++0x [class.copy]p7: 7222 // ... If the class definition declares a move constructor or move 7223 // assignment operator, the implicitly declared constructor is defined as 7224 // deleted; ... 7225 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7226 ClassDecl->hasUserDeclaredMoveAssignment() || 7227 ShouldDeleteCopyConstructor(CopyConstructor)) 7228 CopyConstructor->setDeletedAsWritten(); 7229 7230 return CopyConstructor; 7231} 7232 7233void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7234 CXXConstructorDecl *CopyConstructor) { 7235 assert((CopyConstructor->isDefaulted() && 7236 CopyConstructor->isCopyConstructor() && 7237 !CopyConstructor->doesThisDeclarationHaveABody()) && 7238 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7239 7240 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7241 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7242 7243 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7244 DiagnosticErrorTrap Trap(Diags); 7245 7246 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7247 Trap.hasErrorOccurred()) { 7248 Diag(CurrentLocation, diag::note_member_synthesized_at) 7249 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7250 CopyConstructor->setInvalidDecl(); 7251 } else { 7252 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7253 CopyConstructor->getLocation(), 7254 MultiStmtArg(*this, 0, 0), 7255 /*isStmtExpr=*/false) 7256 .takeAs<Stmt>()); 7257 } 7258 7259 CopyConstructor->setUsed(); 7260 7261 if (ASTMutationListener *L = getASTMutationListener()) { 7262 L->CompletedImplicitDefinition(CopyConstructor); 7263 } 7264} 7265 7266ExprResult 7267Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7268 CXXConstructorDecl *Constructor, 7269 MultiExprArg ExprArgs, 7270 bool RequiresZeroInit, 7271 unsigned ConstructKind, 7272 SourceRange ParenRange) { 7273 bool Elidable = false; 7274 7275 // C++0x [class.copy]p34: 7276 // When certain criteria are met, an implementation is allowed to 7277 // omit the copy/move construction of a class object, even if the 7278 // copy/move constructor and/or destructor for the object have 7279 // side effects. [...] 7280 // - when a temporary class object that has not been bound to a 7281 // reference (12.2) would be copied/moved to a class object 7282 // with the same cv-unqualified type, the copy/move operation 7283 // can be omitted by constructing the temporary object 7284 // directly into the target of the omitted copy/move 7285 if (ConstructKind == CXXConstructExpr::CK_Complete && 7286 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7287 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7288 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7289 } 7290 7291 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7292 Elidable, move(ExprArgs), RequiresZeroInit, 7293 ConstructKind, ParenRange); 7294} 7295 7296/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7297/// including handling of its default argument expressions. 7298ExprResult 7299Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7300 CXXConstructorDecl *Constructor, bool Elidable, 7301 MultiExprArg ExprArgs, 7302 bool RequiresZeroInit, 7303 unsigned ConstructKind, 7304 SourceRange ParenRange) { 7305 unsigned NumExprs = ExprArgs.size(); 7306 Expr **Exprs = (Expr **)ExprArgs.release(); 7307 7308 for (specific_attr_iterator<NonNullAttr> 7309 i = Constructor->specific_attr_begin<NonNullAttr>(), 7310 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7311 const NonNullAttr *NonNull = *i; 7312 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7313 } 7314 7315 MarkDeclarationReferenced(ConstructLoc, Constructor); 7316 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7317 Constructor, Elidable, Exprs, NumExprs, 7318 RequiresZeroInit, 7319 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7320 ParenRange)); 7321} 7322 7323bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7324 CXXConstructorDecl *Constructor, 7325 MultiExprArg Exprs) { 7326 // FIXME: Provide the correct paren SourceRange when available. 7327 ExprResult TempResult = 7328 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7329 move(Exprs), false, CXXConstructExpr::CK_Complete, 7330 SourceRange()); 7331 if (TempResult.isInvalid()) 7332 return true; 7333 7334 Expr *Temp = TempResult.takeAs<Expr>(); 7335 CheckImplicitConversions(Temp, VD->getLocation()); 7336 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7337 Temp = MaybeCreateExprWithCleanups(Temp); 7338 VD->setInit(Temp); 7339 7340 return false; 7341} 7342 7343void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7344 if (VD->isInvalidDecl()) return; 7345 7346 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7347 if (ClassDecl->isInvalidDecl()) return; 7348 if (ClassDecl->hasTrivialDestructor()) return; 7349 if (ClassDecl->isDependentContext()) return; 7350 7351 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7352 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7353 CheckDestructorAccess(VD->getLocation(), Destructor, 7354 PDiag(diag::err_access_dtor_var) 7355 << VD->getDeclName() 7356 << VD->getType()); 7357 7358 if (!VD->hasGlobalStorage()) return; 7359 7360 // Emit warning for non-trivial dtor in global scope (a real global, 7361 // class-static, function-static). 7362 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7363 7364 // TODO: this should be re-enabled for static locals by !CXAAtExit 7365 if (!VD->isStaticLocal()) 7366 Diag(VD->getLocation(), diag::warn_global_destructor); 7367} 7368 7369/// AddCXXDirectInitializerToDecl - This action is called immediately after 7370/// ActOnDeclarator, when a C++ direct initializer is present. 7371/// e.g: "int x(1);" 7372void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7373 SourceLocation LParenLoc, 7374 MultiExprArg Exprs, 7375 SourceLocation RParenLoc, 7376 bool TypeMayContainAuto) { 7377 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7378 7379 // If there is no declaration, there was an error parsing it. Just ignore 7380 // the initializer. 7381 if (RealDecl == 0) 7382 return; 7383 7384 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7385 if (!VDecl) { 7386 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7387 RealDecl->setInvalidDecl(); 7388 return; 7389 } 7390 7391 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7392 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7393 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7394 if (Exprs.size() > 1) { 7395 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7396 diag::err_auto_var_init_multiple_expressions) 7397 << VDecl->getDeclName() << VDecl->getType() 7398 << VDecl->getSourceRange(); 7399 RealDecl->setInvalidDecl(); 7400 return; 7401 } 7402 7403 Expr *Init = Exprs.get()[0]; 7404 TypeSourceInfo *DeducedType = 0; 7405 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7406 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7407 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7408 << Init->getSourceRange(); 7409 if (!DeducedType) { 7410 RealDecl->setInvalidDecl(); 7411 return; 7412 } 7413 VDecl->setTypeSourceInfo(DeducedType); 7414 VDecl->setType(DeducedType->getType()); 7415 7416 // In ARC, infer lifetime. 7417 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 7418 VDecl->setInvalidDecl(); 7419 7420 // If this is a redeclaration, check that the type we just deduced matches 7421 // the previously declared type. 7422 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7423 MergeVarDeclTypes(VDecl, Old); 7424 } 7425 7426 // We will represent direct-initialization similarly to copy-initialization: 7427 // int x(1); -as-> int x = 1; 7428 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7429 // 7430 // Clients that want to distinguish between the two forms, can check for 7431 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7432 // A major benefit is that clients that don't particularly care about which 7433 // exactly form was it (like the CodeGen) can handle both cases without 7434 // special case code. 7435 7436 // C++ 8.5p11: 7437 // The form of initialization (using parentheses or '=') is generally 7438 // insignificant, but does matter when the entity being initialized has a 7439 // class type. 7440 7441 if (!VDecl->getType()->isDependentType() && 7442 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7443 diag::err_typecheck_decl_incomplete_type)) { 7444 VDecl->setInvalidDecl(); 7445 return; 7446 } 7447 7448 // The variable can not have an abstract class type. 7449 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7450 diag::err_abstract_type_in_decl, 7451 AbstractVariableType)) 7452 VDecl->setInvalidDecl(); 7453 7454 const VarDecl *Def; 7455 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7456 Diag(VDecl->getLocation(), diag::err_redefinition) 7457 << VDecl->getDeclName(); 7458 Diag(Def->getLocation(), diag::note_previous_definition); 7459 VDecl->setInvalidDecl(); 7460 return; 7461 } 7462 7463 // C++ [class.static.data]p4 7464 // If a static data member is of const integral or const 7465 // enumeration type, its declaration in the class definition can 7466 // specify a constant-initializer which shall be an integral 7467 // constant expression (5.19). In that case, the member can appear 7468 // in integral constant expressions. The member shall still be 7469 // defined in a namespace scope if it is used in the program and the 7470 // namespace scope definition shall not contain an initializer. 7471 // 7472 // We already performed a redefinition check above, but for static 7473 // data members we also need to check whether there was an in-class 7474 // declaration with an initializer. 7475 const VarDecl* PrevInit = 0; 7476 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7477 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7478 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7479 return; 7480 } 7481 7482 bool IsDependent = false; 7483 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7484 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7485 VDecl->setInvalidDecl(); 7486 return; 7487 } 7488 7489 if (Exprs.get()[I]->isTypeDependent()) 7490 IsDependent = true; 7491 } 7492 7493 // If either the declaration has a dependent type or if any of the 7494 // expressions is type-dependent, we represent the initialization 7495 // via a ParenListExpr for later use during template instantiation. 7496 if (VDecl->getType()->isDependentType() || IsDependent) { 7497 // Let clients know that initialization was done with a direct initializer. 7498 VDecl->setCXXDirectInitializer(true); 7499 7500 // Store the initialization expressions as a ParenListExpr. 7501 unsigned NumExprs = Exprs.size(); 7502 VDecl->setInit(new (Context) ParenListExpr( 7503 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 7504 VDecl->getType().getNonReferenceType())); 7505 return; 7506 } 7507 7508 // Capture the variable that is being initialized and the style of 7509 // initialization. 7510 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7511 7512 // FIXME: Poor source location information. 7513 InitializationKind Kind 7514 = InitializationKind::CreateDirect(VDecl->getLocation(), 7515 LParenLoc, RParenLoc); 7516 7517 InitializationSequence InitSeq(*this, Entity, Kind, 7518 Exprs.get(), Exprs.size()); 7519 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7520 if (Result.isInvalid()) { 7521 VDecl->setInvalidDecl(); 7522 return; 7523 } 7524 7525 CheckImplicitConversions(Result.get(), LParenLoc); 7526 7527 Result = MaybeCreateExprWithCleanups(Result); 7528 VDecl->setInit(Result.takeAs<Expr>()); 7529 VDecl->setCXXDirectInitializer(true); 7530 7531 CheckCompleteVariableDeclaration(VDecl); 7532} 7533 7534/// \brief Given a constructor and the set of arguments provided for the 7535/// constructor, convert the arguments and add any required default arguments 7536/// to form a proper call to this constructor. 7537/// 7538/// \returns true if an error occurred, false otherwise. 7539bool 7540Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7541 MultiExprArg ArgsPtr, 7542 SourceLocation Loc, 7543 ASTOwningVector<Expr*> &ConvertedArgs) { 7544 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7545 unsigned NumArgs = ArgsPtr.size(); 7546 Expr **Args = (Expr **)ArgsPtr.get(); 7547 7548 const FunctionProtoType *Proto 7549 = Constructor->getType()->getAs<FunctionProtoType>(); 7550 assert(Proto && "Constructor without a prototype?"); 7551 unsigned NumArgsInProto = Proto->getNumArgs(); 7552 7553 // If too few arguments are available, we'll fill in the rest with defaults. 7554 if (NumArgs < NumArgsInProto) 7555 ConvertedArgs.reserve(NumArgsInProto); 7556 else 7557 ConvertedArgs.reserve(NumArgs); 7558 7559 VariadicCallType CallType = 7560 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7561 llvm::SmallVector<Expr *, 8> AllArgs; 7562 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7563 Proto, 0, Args, NumArgs, AllArgs, 7564 CallType); 7565 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7566 ConvertedArgs.push_back(AllArgs[i]); 7567 return Invalid; 7568} 7569 7570static inline bool 7571CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7572 const FunctionDecl *FnDecl) { 7573 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7574 if (isa<NamespaceDecl>(DC)) { 7575 return SemaRef.Diag(FnDecl->getLocation(), 7576 diag::err_operator_new_delete_declared_in_namespace) 7577 << FnDecl->getDeclName(); 7578 } 7579 7580 if (isa<TranslationUnitDecl>(DC) && 7581 FnDecl->getStorageClass() == SC_Static) { 7582 return SemaRef.Diag(FnDecl->getLocation(), 7583 diag::err_operator_new_delete_declared_static) 7584 << FnDecl->getDeclName(); 7585 } 7586 7587 return false; 7588} 7589 7590static inline bool 7591CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7592 CanQualType ExpectedResultType, 7593 CanQualType ExpectedFirstParamType, 7594 unsigned DependentParamTypeDiag, 7595 unsigned InvalidParamTypeDiag) { 7596 QualType ResultType = 7597 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7598 7599 // Check that the result type is not dependent. 7600 if (ResultType->isDependentType()) 7601 return SemaRef.Diag(FnDecl->getLocation(), 7602 diag::err_operator_new_delete_dependent_result_type) 7603 << FnDecl->getDeclName() << ExpectedResultType; 7604 7605 // Check that the result type is what we expect. 7606 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7607 return SemaRef.Diag(FnDecl->getLocation(), 7608 diag::err_operator_new_delete_invalid_result_type) 7609 << FnDecl->getDeclName() << ExpectedResultType; 7610 7611 // A function template must have at least 2 parameters. 7612 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7613 return SemaRef.Diag(FnDecl->getLocation(), 7614 diag::err_operator_new_delete_template_too_few_parameters) 7615 << FnDecl->getDeclName(); 7616 7617 // The function decl must have at least 1 parameter. 7618 if (FnDecl->getNumParams() == 0) 7619 return SemaRef.Diag(FnDecl->getLocation(), 7620 diag::err_operator_new_delete_too_few_parameters) 7621 << FnDecl->getDeclName(); 7622 7623 // Check the the first parameter type is not dependent. 7624 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7625 if (FirstParamType->isDependentType()) 7626 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7627 << FnDecl->getDeclName() << ExpectedFirstParamType; 7628 7629 // Check that the first parameter type is what we expect. 7630 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7631 ExpectedFirstParamType) 7632 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7633 << FnDecl->getDeclName() << ExpectedFirstParamType; 7634 7635 return false; 7636} 7637 7638static bool 7639CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7640 // C++ [basic.stc.dynamic.allocation]p1: 7641 // A program is ill-formed if an allocation function is declared in a 7642 // namespace scope other than global scope or declared static in global 7643 // scope. 7644 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7645 return true; 7646 7647 CanQualType SizeTy = 7648 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7649 7650 // C++ [basic.stc.dynamic.allocation]p1: 7651 // The return type shall be void*. The first parameter shall have type 7652 // std::size_t. 7653 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7654 SizeTy, 7655 diag::err_operator_new_dependent_param_type, 7656 diag::err_operator_new_param_type)) 7657 return true; 7658 7659 // C++ [basic.stc.dynamic.allocation]p1: 7660 // The first parameter shall not have an associated default argument. 7661 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7662 return SemaRef.Diag(FnDecl->getLocation(), 7663 diag::err_operator_new_default_arg) 7664 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7665 7666 return false; 7667} 7668 7669static bool 7670CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7671 // C++ [basic.stc.dynamic.deallocation]p1: 7672 // A program is ill-formed if deallocation functions are declared in a 7673 // namespace scope other than global scope or declared static in global 7674 // scope. 7675 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7676 return true; 7677 7678 // C++ [basic.stc.dynamic.deallocation]p2: 7679 // Each deallocation function shall return void and its first parameter 7680 // shall be void*. 7681 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7682 SemaRef.Context.VoidPtrTy, 7683 diag::err_operator_delete_dependent_param_type, 7684 diag::err_operator_delete_param_type)) 7685 return true; 7686 7687 return false; 7688} 7689 7690/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7691/// of this overloaded operator is well-formed. If so, returns false; 7692/// otherwise, emits appropriate diagnostics and returns true. 7693bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7694 assert(FnDecl && FnDecl->isOverloadedOperator() && 7695 "Expected an overloaded operator declaration"); 7696 7697 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7698 7699 // C++ [over.oper]p5: 7700 // The allocation and deallocation functions, operator new, 7701 // operator new[], operator delete and operator delete[], are 7702 // described completely in 3.7.3. The attributes and restrictions 7703 // found in the rest of this subclause do not apply to them unless 7704 // explicitly stated in 3.7.3. 7705 if (Op == OO_Delete || Op == OO_Array_Delete) 7706 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7707 7708 if (Op == OO_New || Op == OO_Array_New) 7709 return CheckOperatorNewDeclaration(*this, FnDecl); 7710 7711 // C++ [over.oper]p6: 7712 // An operator function shall either be a non-static member 7713 // function or be a non-member function and have at least one 7714 // parameter whose type is a class, a reference to a class, an 7715 // enumeration, or a reference to an enumeration. 7716 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7717 if (MethodDecl->isStatic()) 7718 return Diag(FnDecl->getLocation(), 7719 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7720 } else { 7721 bool ClassOrEnumParam = false; 7722 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7723 ParamEnd = FnDecl->param_end(); 7724 Param != ParamEnd; ++Param) { 7725 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7726 if (ParamType->isDependentType() || ParamType->isRecordType() || 7727 ParamType->isEnumeralType()) { 7728 ClassOrEnumParam = true; 7729 break; 7730 } 7731 } 7732 7733 if (!ClassOrEnumParam) 7734 return Diag(FnDecl->getLocation(), 7735 diag::err_operator_overload_needs_class_or_enum) 7736 << FnDecl->getDeclName(); 7737 } 7738 7739 // C++ [over.oper]p8: 7740 // An operator function cannot have default arguments (8.3.6), 7741 // except where explicitly stated below. 7742 // 7743 // Only the function-call operator allows default arguments 7744 // (C++ [over.call]p1). 7745 if (Op != OO_Call) { 7746 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7747 Param != FnDecl->param_end(); ++Param) { 7748 if ((*Param)->hasDefaultArg()) 7749 return Diag((*Param)->getLocation(), 7750 diag::err_operator_overload_default_arg) 7751 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7752 } 7753 } 7754 7755 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7756 { false, false, false } 7757#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7758 , { Unary, Binary, MemberOnly } 7759#include "clang/Basic/OperatorKinds.def" 7760 }; 7761 7762 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7763 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7764 bool MustBeMemberOperator = OperatorUses[Op][2]; 7765 7766 // C++ [over.oper]p8: 7767 // [...] Operator functions cannot have more or fewer parameters 7768 // than the number required for the corresponding operator, as 7769 // described in the rest of this subclause. 7770 unsigned NumParams = FnDecl->getNumParams() 7771 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7772 if (Op != OO_Call && 7773 ((NumParams == 1 && !CanBeUnaryOperator) || 7774 (NumParams == 2 && !CanBeBinaryOperator) || 7775 (NumParams < 1) || (NumParams > 2))) { 7776 // We have the wrong number of parameters. 7777 unsigned ErrorKind; 7778 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7779 ErrorKind = 2; // 2 -> unary or binary. 7780 } else if (CanBeUnaryOperator) { 7781 ErrorKind = 0; // 0 -> unary 7782 } else { 7783 assert(CanBeBinaryOperator && 7784 "All non-call overloaded operators are unary or binary!"); 7785 ErrorKind = 1; // 1 -> binary 7786 } 7787 7788 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7789 << FnDecl->getDeclName() << NumParams << ErrorKind; 7790 } 7791 7792 // Overloaded operators other than operator() cannot be variadic. 7793 if (Op != OO_Call && 7794 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7795 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7796 << FnDecl->getDeclName(); 7797 } 7798 7799 // Some operators must be non-static member functions. 7800 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7801 return Diag(FnDecl->getLocation(), 7802 diag::err_operator_overload_must_be_member) 7803 << FnDecl->getDeclName(); 7804 } 7805 7806 // C++ [over.inc]p1: 7807 // The user-defined function called operator++ implements the 7808 // prefix and postfix ++ operator. If this function is a member 7809 // function with no parameters, or a non-member function with one 7810 // parameter of class or enumeration type, it defines the prefix 7811 // increment operator ++ for objects of that type. If the function 7812 // is a member function with one parameter (which shall be of type 7813 // int) or a non-member function with two parameters (the second 7814 // of which shall be of type int), it defines the postfix 7815 // increment operator ++ for objects of that type. 7816 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7817 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7818 bool ParamIsInt = false; 7819 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7820 ParamIsInt = BT->getKind() == BuiltinType::Int; 7821 7822 if (!ParamIsInt) 7823 return Diag(LastParam->getLocation(), 7824 diag::err_operator_overload_post_incdec_must_be_int) 7825 << LastParam->getType() << (Op == OO_MinusMinus); 7826 } 7827 7828 return false; 7829} 7830 7831/// CheckLiteralOperatorDeclaration - Check whether the declaration 7832/// of this literal operator function is well-formed. If so, returns 7833/// false; otherwise, emits appropriate diagnostics and returns true. 7834bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7835 DeclContext *DC = FnDecl->getDeclContext(); 7836 Decl::Kind Kind = DC->getDeclKind(); 7837 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7838 Kind != Decl::LinkageSpec) { 7839 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7840 << FnDecl->getDeclName(); 7841 return true; 7842 } 7843 7844 bool Valid = false; 7845 7846 // template <char...> type operator "" name() is the only valid template 7847 // signature, and the only valid signature with no parameters. 7848 if (FnDecl->param_size() == 0) { 7849 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7850 // Must have only one template parameter 7851 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7852 if (Params->size() == 1) { 7853 NonTypeTemplateParmDecl *PmDecl = 7854 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7855 7856 // The template parameter must be a char parameter pack. 7857 if (PmDecl && PmDecl->isTemplateParameterPack() && 7858 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7859 Valid = true; 7860 } 7861 } 7862 } else { 7863 // Check the first parameter 7864 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7865 7866 QualType T = (*Param)->getType(); 7867 7868 // unsigned long long int, long double, and any character type are allowed 7869 // as the only parameters. 7870 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7871 Context.hasSameType(T, Context.LongDoubleTy) || 7872 Context.hasSameType(T, Context.CharTy) || 7873 Context.hasSameType(T, Context.WCharTy) || 7874 Context.hasSameType(T, Context.Char16Ty) || 7875 Context.hasSameType(T, Context.Char32Ty)) { 7876 if (++Param == FnDecl->param_end()) 7877 Valid = true; 7878 goto FinishedParams; 7879 } 7880 7881 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7882 const PointerType *PT = T->getAs<PointerType>(); 7883 if (!PT) 7884 goto FinishedParams; 7885 T = PT->getPointeeType(); 7886 if (!T.isConstQualified()) 7887 goto FinishedParams; 7888 T = T.getUnqualifiedType(); 7889 7890 // Move on to the second parameter; 7891 ++Param; 7892 7893 // If there is no second parameter, the first must be a const char * 7894 if (Param == FnDecl->param_end()) { 7895 if (Context.hasSameType(T, Context.CharTy)) 7896 Valid = true; 7897 goto FinishedParams; 7898 } 7899 7900 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7901 // are allowed as the first parameter to a two-parameter function 7902 if (!(Context.hasSameType(T, Context.CharTy) || 7903 Context.hasSameType(T, Context.WCharTy) || 7904 Context.hasSameType(T, Context.Char16Ty) || 7905 Context.hasSameType(T, Context.Char32Ty))) 7906 goto FinishedParams; 7907 7908 // The second and final parameter must be an std::size_t 7909 T = (*Param)->getType().getUnqualifiedType(); 7910 if (Context.hasSameType(T, Context.getSizeType()) && 7911 ++Param == FnDecl->param_end()) 7912 Valid = true; 7913 } 7914 7915 // FIXME: This diagnostic is absolutely terrible. 7916FinishedParams: 7917 if (!Valid) { 7918 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7919 << FnDecl->getDeclName(); 7920 return true; 7921 } 7922 7923 return false; 7924} 7925 7926/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7927/// linkage specification, including the language and (if present) 7928/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7929/// the location of the language string literal, which is provided 7930/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7931/// the '{' brace. Otherwise, this linkage specification does not 7932/// have any braces. 7933Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7934 SourceLocation LangLoc, 7935 llvm::StringRef Lang, 7936 SourceLocation LBraceLoc) { 7937 LinkageSpecDecl::LanguageIDs Language; 7938 if (Lang == "\"C\"") 7939 Language = LinkageSpecDecl::lang_c; 7940 else if (Lang == "\"C++\"") 7941 Language = LinkageSpecDecl::lang_cxx; 7942 else { 7943 Diag(LangLoc, diag::err_bad_language); 7944 return 0; 7945 } 7946 7947 // FIXME: Add all the various semantics of linkage specifications 7948 7949 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7950 ExternLoc, LangLoc, Language); 7951 CurContext->addDecl(D); 7952 PushDeclContext(S, D); 7953 return D; 7954} 7955 7956/// ActOnFinishLinkageSpecification - Complete the definition of 7957/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7958/// valid, it's the position of the closing '}' brace in a linkage 7959/// specification that uses braces. 7960Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7961 Decl *LinkageSpec, 7962 SourceLocation RBraceLoc) { 7963 if (LinkageSpec) { 7964 if (RBraceLoc.isValid()) { 7965 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7966 LSDecl->setRBraceLoc(RBraceLoc); 7967 } 7968 PopDeclContext(); 7969 } 7970 return LinkageSpec; 7971} 7972 7973/// \brief Perform semantic analysis for the variable declaration that 7974/// occurs within a C++ catch clause, returning the newly-created 7975/// variable. 7976VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7977 TypeSourceInfo *TInfo, 7978 SourceLocation StartLoc, 7979 SourceLocation Loc, 7980 IdentifierInfo *Name) { 7981 bool Invalid = false; 7982 QualType ExDeclType = TInfo->getType(); 7983 7984 // Arrays and functions decay. 7985 if (ExDeclType->isArrayType()) 7986 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7987 else if (ExDeclType->isFunctionType()) 7988 ExDeclType = Context.getPointerType(ExDeclType); 7989 7990 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7991 // The exception-declaration shall not denote a pointer or reference to an 7992 // incomplete type, other than [cv] void*. 7993 // N2844 forbids rvalue references. 7994 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7995 Diag(Loc, diag::err_catch_rvalue_ref); 7996 Invalid = true; 7997 } 7998 7999 // GCC allows catching pointers and references to incomplete types 8000 // as an extension; so do we, but we warn by default. 8001 8002 QualType BaseType = ExDeclType; 8003 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 8004 unsigned DK = diag::err_catch_incomplete; 8005 bool IncompleteCatchIsInvalid = true; 8006 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8007 BaseType = Ptr->getPointeeType(); 8008 Mode = 1; 8009 DK = diag::ext_catch_incomplete_ptr; 8010 IncompleteCatchIsInvalid = false; 8011 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8012 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8013 BaseType = Ref->getPointeeType(); 8014 Mode = 2; 8015 DK = diag::ext_catch_incomplete_ref; 8016 IncompleteCatchIsInvalid = false; 8017 } 8018 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8019 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8020 IncompleteCatchIsInvalid) 8021 Invalid = true; 8022 8023 if (!Invalid && !ExDeclType->isDependentType() && 8024 RequireNonAbstractType(Loc, ExDeclType, 8025 diag::err_abstract_type_in_decl, 8026 AbstractVariableType)) 8027 Invalid = true; 8028 8029 // Only the non-fragile NeXT runtime currently supports C++ catches 8030 // of ObjC types, and no runtime supports catching ObjC types by value. 8031 if (!Invalid && getLangOptions().ObjC1) { 8032 QualType T = ExDeclType; 8033 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8034 T = RT->getPointeeType(); 8035 8036 if (T->isObjCObjectType()) { 8037 Diag(Loc, diag::err_objc_object_catch); 8038 Invalid = true; 8039 } else if (T->isObjCObjectPointerType()) { 8040 if (!getLangOptions().ObjCNonFragileABI) 8041 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 8042 } 8043 } 8044 8045 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8046 ExDeclType, TInfo, SC_None, SC_None); 8047 ExDecl->setExceptionVariable(true); 8048 8049 if (!Invalid) { 8050 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8051 // C++ [except.handle]p16: 8052 // The object declared in an exception-declaration or, if the 8053 // exception-declaration does not specify a name, a temporary (12.2) is 8054 // copy-initialized (8.5) from the exception object. [...] 8055 // The object is destroyed when the handler exits, after the destruction 8056 // of any automatic objects initialized within the handler. 8057 // 8058 // We just pretend to initialize the object with itself, then make sure 8059 // it can be destroyed later. 8060 QualType initType = ExDeclType; 8061 8062 InitializedEntity entity = 8063 InitializedEntity::InitializeVariable(ExDecl); 8064 InitializationKind initKind = 8065 InitializationKind::CreateCopy(Loc, SourceLocation()); 8066 8067 Expr *opaqueValue = 8068 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8069 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8070 ExprResult result = sequence.Perform(*this, entity, initKind, 8071 MultiExprArg(&opaqueValue, 1)); 8072 if (result.isInvalid()) 8073 Invalid = true; 8074 else { 8075 // If the constructor used was non-trivial, set this as the 8076 // "initializer". 8077 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8078 if (!construct->getConstructor()->isTrivial()) { 8079 Expr *init = MaybeCreateExprWithCleanups(construct); 8080 ExDecl->setInit(init); 8081 } 8082 8083 // And make sure it's destructable. 8084 FinalizeVarWithDestructor(ExDecl, recordType); 8085 } 8086 } 8087 } 8088 8089 if (Invalid) 8090 ExDecl->setInvalidDecl(); 8091 8092 return ExDecl; 8093} 8094 8095/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8096/// handler. 8097Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8098 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8099 bool Invalid = D.isInvalidType(); 8100 8101 // Check for unexpanded parameter packs. 8102 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8103 UPPC_ExceptionType)) { 8104 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8105 D.getIdentifierLoc()); 8106 Invalid = true; 8107 } 8108 8109 IdentifierInfo *II = D.getIdentifier(); 8110 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8111 LookupOrdinaryName, 8112 ForRedeclaration)) { 8113 // The scope should be freshly made just for us. There is just no way 8114 // it contains any previous declaration. 8115 assert(!S->isDeclScope(PrevDecl)); 8116 if (PrevDecl->isTemplateParameter()) { 8117 // Maybe we will complain about the shadowed template parameter. 8118 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8119 } 8120 } 8121 8122 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8123 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8124 << D.getCXXScopeSpec().getRange(); 8125 Invalid = true; 8126 } 8127 8128 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8129 D.getSourceRange().getBegin(), 8130 D.getIdentifierLoc(), 8131 D.getIdentifier()); 8132 if (Invalid) 8133 ExDecl->setInvalidDecl(); 8134 8135 // Add the exception declaration into this scope. 8136 if (II) 8137 PushOnScopeChains(ExDecl, S); 8138 else 8139 CurContext->addDecl(ExDecl); 8140 8141 ProcessDeclAttributes(S, ExDecl, D); 8142 return ExDecl; 8143} 8144 8145Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8146 Expr *AssertExpr, 8147 Expr *AssertMessageExpr_, 8148 SourceLocation RParenLoc) { 8149 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8150 8151 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8152 llvm::APSInt Value(32); 8153 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8154 Diag(StaticAssertLoc, 8155 diag::err_static_assert_expression_is_not_constant) << 8156 AssertExpr->getSourceRange(); 8157 return 0; 8158 } 8159 8160 if (Value == 0) { 8161 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8162 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8163 } 8164 } 8165 8166 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8167 return 0; 8168 8169 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8170 AssertExpr, AssertMessage, RParenLoc); 8171 8172 CurContext->addDecl(Decl); 8173 return Decl; 8174} 8175 8176/// \brief Perform semantic analysis of the given friend type declaration. 8177/// 8178/// \returns A friend declaration that. 8179FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8180 TypeSourceInfo *TSInfo) { 8181 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8182 8183 QualType T = TSInfo->getType(); 8184 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8185 8186 if (!getLangOptions().CPlusPlus0x) { 8187 // C++03 [class.friend]p2: 8188 // An elaborated-type-specifier shall be used in a friend declaration 8189 // for a class.* 8190 // 8191 // * The class-key of the elaborated-type-specifier is required. 8192 if (!ActiveTemplateInstantiations.empty()) { 8193 // Do not complain about the form of friend template types during 8194 // template instantiation; we will already have complained when the 8195 // template was declared. 8196 } else if (!T->isElaboratedTypeSpecifier()) { 8197 // If we evaluated the type to a record type, suggest putting 8198 // a tag in front. 8199 if (const RecordType *RT = T->getAs<RecordType>()) { 8200 RecordDecl *RD = RT->getDecl(); 8201 8202 std::string InsertionText = std::string(" ") + RD->getKindName(); 8203 8204 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8205 << (unsigned) RD->getTagKind() 8206 << T 8207 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8208 InsertionText); 8209 } else { 8210 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8211 << T 8212 << SourceRange(FriendLoc, TypeRange.getEnd()); 8213 } 8214 } else if (T->getAs<EnumType>()) { 8215 Diag(FriendLoc, diag::ext_enum_friend) 8216 << T 8217 << SourceRange(FriendLoc, TypeRange.getEnd()); 8218 } 8219 } 8220 8221 // C++0x [class.friend]p3: 8222 // If the type specifier in a friend declaration designates a (possibly 8223 // cv-qualified) class type, that class is declared as a friend; otherwise, 8224 // the friend declaration is ignored. 8225 8226 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8227 // in [class.friend]p3 that we do not implement. 8228 8229 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8230} 8231 8232/// Handle a friend tag declaration where the scope specifier was 8233/// templated. 8234Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8235 unsigned TagSpec, SourceLocation TagLoc, 8236 CXXScopeSpec &SS, 8237 IdentifierInfo *Name, SourceLocation NameLoc, 8238 AttributeList *Attr, 8239 MultiTemplateParamsArg TempParamLists) { 8240 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8241 8242 bool isExplicitSpecialization = false; 8243 bool Invalid = false; 8244 8245 if (TemplateParameterList *TemplateParams 8246 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8247 TempParamLists.get(), 8248 TempParamLists.size(), 8249 /*friend*/ true, 8250 isExplicitSpecialization, 8251 Invalid)) { 8252 if (TemplateParams->size() > 0) { 8253 // This is a declaration of a class template. 8254 if (Invalid) 8255 return 0; 8256 8257 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8258 SS, Name, NameLoc, Attr, 8259 TemplateParams, AS_public, 8260 TempParamLists.size() - 1, 8261 (TemplateParameterList**) TempParamLists.release()).take(); 8262 } else { 8263 // The "template<>" header is extraneous. 8264 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8265 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8266 isExplicitSpecialization = true; 8267 } 8268 } 8269 8270 if (Invalid) return 0; 8271 8272 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8273 8274 bool isAllExplicitSpecializations = true; 8275 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8276 if (TempParamLists.get()[I]->size()) { 8277 isAllExplicitSpecializations = false; 8278 break; 8279 } 8280 } 8281 8282 // FIXME: don't ignore attributes. 8283 8284 // If it's explicit specializations all the way down, just forget 8285 // about the template header and build an appropriate non-templated 8286 // friend. TODO: for source fidelity, remember the headers. 8287 if (isAllExplicitSpecializations) { 8288 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8289 ElaboratedTypeKeyword Keyword 8290 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8291 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8292 *Name, NameLoc); 8293 if (T.isNull()) 8294 return 0; 8295 8296 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8297 if (isa<DependentNameType>(T)) { 8298 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8299 TL.setKeywordLoc(TagLoc); 8300 TL.setQualifierLoc(QualifierLoc); 8301 TL.setNameLoc(NameLoc); 8302 } else { 8303 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8304 TL.setKeywordLoc(TagLoc); 8305 TL.setQualifierLoc(QualifierLoc); 8306 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8307 } 8308 8309 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8310 TSI, FriendLoc); 8311 Friend->setAccess(AS_public); 8312 CurContext->addDecl(Friend); 8313 return Friend; 8314 } 8315 8316 // Handle the case of a templated-scope friend class. e.g. 8317 // template <class T> class A<T>::B; 8318 // FIXME: we don't support these right now. 8319 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8320 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8321 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8322 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8323 TL.setKeywordLoc(TagLoc); 8324 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8325 TL.setNameLoc(NameLoc); 8326 8327 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8328 TSI, FriendLoc); 8329 Friend->setAccess(AS_public); 8330 Friend->setUnsupportedFriend(true); 8331 CurContext->addDecl(Friend); 8332 return Friend; 8333} 8334 8335 8336/// Handle a friend type declaration. This works in tandem with 8337/// ActOnTag. 8338/// 8339/// Notes on friend class templates: 8340/// 8341/// We generally treat friend class declarations as if they were 8342/// declaring a class. So, for example, the elaborated type specifier 8343/// in a friend declaration is required to obey the restrictions of a 8344/// class-head (i.e. no typedefs in the scope chain), template 8345/// parameters are required to match up with simple template-ids, &c. 8346/// However, unlike when declaring a template specialization, it's 8347/// okay to refer to a template specialization without an empty 8348/// template parameter declaration, e.g. 8349/// friend class A<T>::B<unsigned>; 8350/// We permit this as a special case; if there are any template 8351/// parameters present at all, require proper matching, i.e. 8352/// template <> template <class T> friend class A<int>::B; 8353Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8354 MultiTemplateParamsArg TempParams) { 8355 SourceLocation Loc = DS.getSourceRange().getBegin(); 8356 8357 assert(DS.isFriendSpecified()); 8358 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8359 8360 // Try to convert the decl specifier to a type. This works for 8361 // friend templates because ActOnTag never produces a ClassTemplateDecl 8362 // for a TUK_Friend. 8363 Declarator TheDeclarator(DS, Declarator::MemberContext); 8364 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8365 QualType T = TSI->getType(); 8366 if (TheDeclarator.isInvalidType()) 8367 return 0; 8368 8369 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8370 return 0; 8371 8372 // This is definitely an error in C++98. It's probably meant to 8373 // be forbidden in C++0x, too, but the specification is just 8374 // poorly written. 8375 // 8376 // The problem is with declarations like the following: 8377 // template <T> friend A<T>::foo; 8378 // where deciding whether a class C is a friend or not now hinges 8379 // on whether there exists an instantiation of A that causes 8380 // 'foo' to equal C. There are restrictions on class-heads 8381 // (which we declare (by fiat) elaborated friend declarations to 8382 // be) that makes this tractable. 8383 // 8384 // FIXME: handle "template <> friend class A<T>;", which 8385 // is possibly well-formed? Who even knows? 8386 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8387 Diag(Loc, diag::err_tagless_friend_type_template) 8388 << DS.getSourceRange(); 8389 return 0; 8390 } 8391 8392 // C++98 [class.friend]p1: A friend of a class is a function 8393 // or class that is not a member of the class . . . 8394 // This is fixed in DR77, which just barely didn't make the C++03 8395 // deadline. It's also a very silly restriction that seriously 8396 // affects inner classes and which nobody else seems to implement; 8397 // thus we never diagnose it, not even in -pedantic. 8398 // 8399 // But note that we could warn about it: it's always useless to 8400 // friend one of your own members (it's not, however, worthless to 8401 // friend a member of an arbitrary specialization of your template). 8402 8403 Decl *D; 8404 if (unsigned NumTempParamLists = TempParams.size()) 8405 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8406 NumTempParamLists, 8407 TempParams.release(), 8408 TSI, 8409 DS.getFriendSpecLoc()); 8410 else 8411 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8412 8413 if (!D) 8414 return 0; 8415 8416 D->setAccess(AS_public); 8417 CurContext->addDecl(D); 8418 8419 return D; 8420} 8421 8422Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8423 MultiTemplateParamsArg TemplateParams) { 8424 const DeclSpec &DS = D.getDeclSpec(); 8425 8426 assert(DS.isFriendSpecified()); 8427 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8428 8429 SourceLocation Loc = D.getIdentifierLoc(); 8430 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8431 QualType T = TInfo->getType(); 8432 8433 // C++ [class.friend]p1 8434 // A friend of a class is a function or class.... 8435 // Note that this sees through typedefs, which is intended. 8436 // It *doesn't* see through dependent types, which is correct 8437 // according to [temp.arg.type]p3: 8438 // If a declaration acquires a function type through a 8439 // type dependent on a template-parameter and this causes 8440 // a declaration that does not use the syntactic form of a 8441 // function declarator to have a function type, the program 8442 // is ill-formed. 8443 if (!T->isFunctionType()) { 8444 Diag(Loc, diag::err_unexpected_friend); 8445 8446 // It might be worthwhile to try to recover by creating an 8447 // appropriate declaration. 8448 return 0; 8449 } 8450 8451 // C++ [namespace.memdef]p3 8452 // - If a friend declaration in a non-local class first declares a 8453 // class or function, the friend class or function is a member 8454 // of the innermost enclosing namespace. 8455 // - The name of the friend is not found by simple name lookup 8456 // until a matching declaration is provided in that namespace 8457 // scope (either before or after the class declaration granting 8458 // friendship). 8459 // - If a friend function is called, its name may be found by the 8460 // name lookup that considers functions from namespaces and 8461 // classes associated with the types of the function arguments. 8462 // - When looking for a prior declaration of a class or a function 8463 // declared as a friend, scopes outside the innermost enclosing 8464 // namespace scope are not considered. 8465 8466 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8467 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8468 DeclarationName Name = NameInfo.getName(); 8469 assert(Name); 8470 8471 // Check for unexpanded parameter packs. 8472 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8473 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8474 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8475 return 0; 8476 8477 // The context we found the declaration in, or in which we should 8478 // create the declaration. 8479 DeclContext *DC; 8480 Scope *DCScope = S; 8481 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8482 ForRedeclaration); 8483 8484 // FIXME: there are different rules in local classes 8485 8486 // There are four cases here. 8487 // - There's no scope specifier, in which case we just go to the 8488 // appropriate scope and look for a function or function template 8489 // there as appropriate. 8490 // Recover from invalid scope qualifiers as if they just weren't there. 8491 if (SS.isInvalid() || !SS.isSet()) { 8492 // C++0x [namespace.memdef]p3: 8493 // If the name in a friend declaration is neither qualified nor 8494 // a template-id and the declaration is a function or an 8495 // elaborated-type-specifier, the lookup to determine whether 8496 // the entity has been previously declared shall not consider 8497 // any scopes outside the innermost enclosing namespace. 8498 // C++0x [class.friend]p11: 8499 // If a friend declaration appears in a local class and the name 8500 // specified is an unqualified name, a prior declaration is 8501 // looked up without considering scopes that are outside the 8502 // innermost enclosing non-class scope. For a friend function 8503 // declaration, if there is no prior declaration, the program is 8504 // ill-formed. 8505 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8506 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8507 8508 // Find the appropriate context according to the above. 8509 DC = CurContext; 8510 while (true) { 8511 // Skip class contexts. If someone can cite chapter and verse 8512 // for this behavior, that would be nice --- it's what GCC and 8513 // EDG do, and it seems like a reasonable intent, but the spec 8514 // really only says that checks for unqualified existing 8515 // declarations should stop at the nearest enclosing namespace, 8516 // not that they should only consider the nearest enclosing 8517 // namespace. 8518 while (DC->isRecord()) 8519 DC = DC->getParent(); 8520 8521 LookupQualifiedName(Previous, DC); 8522 8523 // TODO: decide what we think about using declarations. 8524 if (isLocal || !Previous.empty()) 8525 break; 8526 8527 if (isTemplateId) { 8528 if (isa<TranslationUnitDecl>(DC)) break; 8529 } else { 8530 if (DC->isFileContext()) break; 8531 } 8532 DC = DC->getParent(); 8533 } 8534 8535 // C++ [class.friend]p1: A friend of a class is a function or 8536 // class that is not a member of the class . . . 8537 // C++0x changes this for both friend types and functions. 8538 // Most C++ 98 compilers do seem to give an error here, so 8539 // we do, too. 8540 if (!Previous.empty() && DC->Equals(CurContext) 8541 && !getLangOptions().CPlusPlus0x) 8542 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8543 8544 DCScope = getScopeForDeclContext(S, DC); 8545 8546 // - There's a non-dependent scope specifier, in which case we 8547 // compute it and do a previous lookup there for a function 8548 // or function template. 8549 } else if (!SS.getScopeRep()->isDependent()) { 8550 DC = computeDeclContext(SS); 8551 if (!DC) return 0; 8552 8553 if (RequireCompleteDeclContext(SS, DC)) return 0; 8554 8555 LookupQualifiedName(Previous, DC); 8556 8557 // Ignore things found implicitly in the wrong scope. 8558 // TODO: better diagnostics for this case. Suggesting the right 8559 // qualified scope would be nice... 8560 LookupResult::Filter F = Previous.makeFilter(); 8561 while (F.hasNext()) { 8562 NamedDecl *D = F.next(); 8563 if (!DC->InEnclosingNamespaceSetOf( 8564 D->getDeclContext()->getRedeclContext())) 8565 F.erase(); 8566 } 8567 F.done(); 8568 8569 if (Previous.empty()) { 8570 D.setInvalidType(); 8571 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8572 return 0; 8573 } 8574 8575 // C++ [class.friend]p1: A friend of a class is a function or 8576 // class that is not a member of the class . . . 8577 if (DC->Equals(CurContext)) 8578 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8579 8580 // - There's a scope specifier that does not match any template 8581 // parameter lists, in which case we use some arbitrary context, 8582 // create a method or method template, and wait for instantiation. 8583 // - There's a scope specifier that does match some template 8584 // parameter lists, which we don't handle right now. 8585 } else { 8586 DC = CurContext; 8587 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8588 } 8589 8590 if (!DC->isRecord()) { 8591 // This implies that it has to be an operator or function. 8592 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8593 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8594 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8595 Diag(Loc, diag::err_introducing_special_friend) << 8596 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8597 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8598 return 0; 8599 } 8600 } 8601 8602 bool Redeclaration = false; 8603 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8604 move(TemplateParams), 8605 IsDefinition, 8606 Redeclaration); 8607 if (!ND) return 0; 8608 8609 assert(ND->getDeclContext() == DC); 8610 assert(ND->getLexicalDeclContext() == CurContext); 8611 8612 // Add the function declaration to the appropriate lookup tables, 8613 // adjusting the redeclarations list as necessary. We don't 8614 // want to do this yet if the friending class is dependent. 8615 // 8616 // Also update the scope-based lookup if the target context's 8617 // lookup context is in lexical scope. 8618 if (!CurContext->isDependentContext()) { 8619 DC = DC->getRedeclContext(); 8620 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8621 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8622 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8623 } 8624 8625 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8626 D.getIdentifierLoc(), ND, 8627 DS.getFriendSpecLoc()); 8628 FrD->setAccess(AS_public); 8629 CurContext->addDecl(FrD); 8630 8631 if (ND->isInvalidDecl()) 8632 FrD->setInvalidDecl(); 8633 else { 8634 FunctionDecl *FD; 8635 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8636 FD = FTD->getTemplatedDecl(); 8637 else 8638 FD = cast<FunctionDecl>(ND); 8639 8640 // Mark templated-scope function declarations as unsupported. 8641 if (FD->getNumTemplateParameterLists()) 8642 FrD->setUnsupportedFriend(true); 8643 } 8644 8645 return ND; 8646} 8647 8648void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8649 AdjustDeclIfTemplate(Dcl); 8650 8651 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8652 if (!Fn) { 8653 Diag(DelLoc, diag::err_deleted_non_function); 8654 return; 8655 } 8656 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8657 Diag(DelLoc, diag::err_deleted_decl_not_first); 8658 Diag(Prev->getLocation(), diag::note_previous_declaration); 8659 // If the declaration wasn't the first, we delete the function anyway for 8660 // recovery. 8661 } 8662 Fn->setDeletedAsWritten(); 8663} 8664 8665void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8666 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8667 8668 if (MD) { 8669 if (MD->getParent()->isDependentType()) { 8670 MD->setDefaulted(); 8671 MD->setExplicitlyDefaulted(); 8672 return; 8673 } 8674 8675 CXXSpecialMember Member = getSpecialMember(MD); 8676 if (Member == CXXInvalid) { 8677 Diag(DefaultLoc, diag::err_default_special_members); 8678 return; 8679 } 8680 8681 MD->setDefaulted(); 8682 MD->setExplicitlyDefaulted(); 8683 8684 // If this definition appears within the record, do the checking when 8685 // the record is complete. 8686 const FunctionDecl *Primary = MD; 8687 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8688 // Find the uninstantiated declaration that actually had the '= default' 8689 // on it. 8690 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8691 8692 if (Primary == Primary->getCanonicalDecl()) 8693 return; 8694 8695 switch (Member) { 8696 case CXXDefaultConstructor: { 8697 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8698 CheckExplicitlyDefaultedDefaultConstructor(CD); 8699 if (!CD->isInvalidDecl()) 8700 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8701 break; 8702 } 8703 8704 case CXXCopyConstructor: { 8705 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8706 CheckExplicitlyDefaultedCopyConstructor(CD); 8707 if (!CD->isInvalidDecl()) 8708 DefineImplicitCopyConstructor(DefaultLoc, CD); 8709 break; 8710 } 8711 8712 case CXXCopyAssignment: { 8713 CheckExplicitlyDefaultedCopyAssignment(MD); 8714 if (!MD->isInvalidDecl()) 8715 DefineImplicitCopyAssignment(DefaultLoc, MD); 8716 break; 8717 } 8718 8719 case CXXDestructor: { 8720 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8721 CheckExplicitlyDefaultedDestructor(DD); 8722 if (!DD->isInvalidDecl()) 8723 DefineImplicitDestructor(DefaultLoc, DD); 8724 break; 8725 } 8726 8727 case CXXMoveConstructor: 8728 case CXXMoveAssignment: 8729 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8730 break; 8731 8732 default: 8733 // FIXME: Do the rest once we have move functions 8734 break; 8735 } 8736 } else { 8737 Diag(DefaultLoc, diag::err_default_special_members); 8738 } 8739} 8740 8741static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8742 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8743 Stmt *SubStmt = *CI; 8744 if (!SubStmt) 8745 continue; 8746 if (isa<ReturnStmt>(SubStmt)) 8747 Self.Diag(SubStmt->getSourceRange().getBegin(), 8748 diag::err_return_in_constructor_handler); 8749 if (!isa<Expr>(SubStmt)) 8750 SearchForReturnInStmt(Self, SubStmt); 8751 } 8752} 8753 8754void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8755 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8756 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8757 SearchForReturnInStmt(*this, Handler); 8758 } 8759} 8760 8761bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8762 const CXXMethodDecl *Old) { 8763 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8764 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8765 8766 if (Context.hasSameType(NewTy, OldTy) || 8767 NewTy->isDependentType() || OldTy->isDependentType()) 8768 return false; 8769 8770 // Check if the return types are covariant 8771 QualType NewClassTy, OldClassTy; 8772 8773 /// Both types must be pointers or references to classes. 8774 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8775 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8776 NewClassTy = NewPT->getPointeeType(); 8777 OldClassTy = OldPT->getPointeeType(); 8778 } 8779 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8780 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8781 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8782 NewClassTy = NewRT->getPointeeType(); 8783 OldClassTy = OldRT->getPointeeType(); 8784 } 8785 } 8786 } 8787 8788 // The return types aren't either both pointers or references to a class type. 8789 if (NewClassTy.isNull()) { 8790 Diag(New->getLocation(), 8791 diag::err_different_return_type_for_overriding_virtual_function) 8792 << New->getDeclName() << NewTy << OldTy; 8793 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8794 8795 return true; 8796 } 8797 8798 // C++ [class.virtual]p6: 8799 // If the return type of D::f differs from the return type of B::f, the 8800 // class type in the return type of D::f shall be complete at the point of 8801 // declaration of D::f or shall be the class type D. 8802 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8803 if (!RT->isBeingDefined() && 8804 RequireCompleteType(New->getLocation(), NewClassTy, 8805 PDiag(diag::err_covariant_return_incomplete) 8806 << New->getDeclName())) 8807 return true; 8808 } 8809 8810 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8811 // Check if the new class derives from the old class. 8812 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8813 Diag(New->getLocation(), 8814 diag::err_covariant_return_not_derived) 8815 << New->getDeclName() << NewTy << OldTy; 8816 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8817 return true; 8818 } 8819 8820 // Check if we the conversion from derived to base is valid. 8821 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8822 diag::err_covariant_return_inaccessible_base, 8823 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8824 // FIXME: Should this point to the return type? 8825 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8826 // FIXME: this note won't trigger for delayed access control 8827 // diagnostics, and it's impossible to get an undelayed error 8828 // here from access control during the original parse because 8829 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8830 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8831 return true; 8832 } 8833 } 8834 8835 // The qualifiers of the return types must be the same. 8836 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8837 Diag(New->getLocation(), 8838 diag::err_covariant_return_type_different_qualifications) 8839 << New->getDeclName() << NewTy << OldTy; 8840 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8841 return true; 8842 }; 8843 8844 8845 // The new class type must have the same or less qualifiers as the old type. 8846 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8847 Diag(New->getLocation(), 8848 diag::err_covariant_return_type_class_type_more_qualified) 8849 << New->getDeclName() << NewTy << OldTy; 8850 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8851 return true; 8852 }; 8853 8854 return false; 8855} 8856 8857/// \brief Mark the given method pure. 8858/// 8859/// \param Method the method to be marked pure. 8860/// 8861/// \param InitRange the source range that covers the "0" initializer. 8862bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8863 SourceLocation EndLoc = InitRange.getEnd(); 8864 if (EndLoc.isValid()) 8865 Method->setRangeEnd(EndLoc); 8866 8867 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8868 Method->setPure(); 8869 return false; 8870 } 8871 8872 if (!Method->isInvalidDecl()) 8873 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8874 << Method->getDeclName() << InitRange; 8875 return true; 8876} 8877 8878/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8879/// an initializer for the out-of-line declaration 'Dcl'. The scope 8880/// is a fresh scope pushed for just this purpose. 8881/// 8882/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8883/// static data member of class X, names should be looked up in the scope of 8884/// class X. 8885void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8886 // If there is no declaration, there was an error parsing it. 8887 if (D == 0 || D->isInvalidDecl()) return; 8888 8889 // We should only get called for declarations with scope specifiers, like: 8890 // int foo::bar; 8891 assert(D->isOutOfLine()); 8892 EnterDeclaratorContext(S, D->getDeclContext()); 8893} 8894 8895/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8896/// initializer for the out-of-line declaration 'D'. 8897void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8898 // If there is no declaration, there was an error parsing it. 8899 if (D == 0 || D->isInvalidDecl()) return; 8900 8901 assert(D->isOutOfLine()); 8902 ExitDeclaratorContext(S); 8903} 8904 8905/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8906/// C++ if/switch/while/for statement. 8907/// e.g: "if (int x = f()) {...}" 8908DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8909 // C++ 6.4p2: 8910 // The declarator shall not specify a function or an array. 8911 // The type-specifier-seq shall not contain typedef and shall not declare a 8912 // new class or enumeration. 8913 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8914 "Parser allowed 'typedef' as storage class of condition decl."); 8915 8916 Decl *Dcl = ActOnDeclarator(S, D); 8917 if (!Dcl) 8918 return true; 8919 8920 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 8921 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 8922 << D.getSourceRange(); 8923 return true; 8924 } 8925 8926 return Dcl; 8927} 8928 8929void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8930 bool DefinitionRequired) { 8931 // Ignore any vtable uses in unevaluated operands or for classes that do 8932 // not have a vtable. 8933 if (!Class->isDynamicClass() || Class->isDependentContext() || 8934 CurContext->isDependentContext() || 8935 ExprEvalContexts.back().Context == Unevaluated) 8936 return; 8937 8938 // Try to insert this class into the map. 8939 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8940 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8941 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8942 if (!Pos.second) { 8943 // If we already had an entry, check to see if we are promoting this vtable 8944 // to required a definition. If so, we need to reappend to the VTableUses 8945 // list, since we may have already processed the first entry. 8946 if (DefinitionRequired && !Pos.first->second) { 8947 Pos.first->second = true; 8948 } else { 8949 // Otherwise, we can early exit. 8950 return; 8951 } 8952 } 8953 8954 // Local classes need to have their virtual members marked 8955 // immediately. For all other classes, we mark their virtual members 8956 // at the end of the translation unit. 8957 if (Class->isLocalClass()) 8958 MarkVirtualMembersReferenced(Loc, Class); 8959 else 8960 VTableUses.push_back(std::make_pair(Class, Loc)); 8961} 8962 8963bool Sema::DefineUsedVTables() { 8964 if (VTableUses.empty()) 8965 return false; 8966 8967 // Note: The VTableUses vector could grow as a result of marking 8968 // the members of a class as "used", so we check the size each 8969 // time through the loop and prefer indices (with are stable) to 8970 // iterators (which are not). 8971 bool DefinedAnything = false; 8972 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8973 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8974 if (!Class) 8975 continue; 8976 8977 SourceLocation Loc = VTableUses[I].second; 8978 8979 // If this class has a key function, but that key function is 8980 // defined in another translation unit, we don't need to emit the 8981 // vtable even though we're using it. 8982 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8983 if (KeyFunction && !KeyFunction->hasBody()) { 8984 switch (KeyFunction->getTemplateSpecializationKind()) { 8985 case TSK_Undeclared: 8986 case TSK_ExplicitSpecialization: 8987 case TSK_ExplicitInstantiationDeclaration: 8988 // The key function is in another translation unit. 8989 continue; 8990 8991 case TSK_ExplicitInstantiationDefinition: 8992 case TSK_ImplicitInstantiation: 8993 // We will be instantiating the key function. 8994 break; 8995 } 8996 } else if (!KeyFunction) { 8997 // If we have a class with no key function that is the subject 8998 // of an explicit instantiation declaration, suppress the 8999 // vtable; it will live with the explicit instantiation 9000 // definition. 9001 bool IsExplicitInstantiationDeclaration 9002 = Class->getTemplateSpecializationKind() 9003 == TSK_ExplicitInstantiationDeclaration; 9004 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9005 REnd = Class->redecls_end(); 9006 R != REnd; ++R) { 9007 TemplateSpecializationKind TSK 9008 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9009 if (TSK == TSK_ExplicitInstantiationDeclaration) 9010 IsExplicitInstantiationDeclaration = true; 9011 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9012 IsExplicitInstantiationDeclaration = false; 9013 break; 9014 } 9015 } 9016 9017 if (IsExplicitInstantiationDeclaration) 9018 continue; 9019 } 9020 9021 // Mark all of the virtual members of this class as referenced, so 9022 // that we can build a vtable. Then, tell the AST consumer that a 9023 // vtable for this class is required. 9024 DefinedAnything = true; 9025 MarkVirtualMembersReferenced(Loc, Class); 9026 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9027 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9028 9029 // Optionally warn if we're emitting a weak vtable. 9030 if (Class->getLinkage() == ExternalLinkage && 9031 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9032 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9033 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9034 } 9035 } 9036 VTableUses.clear(); 9037 9038 return DefinedAnything; 9039} 9040 9041void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9042 const CXXRecordDecl *RD) { 9043 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9044 e = RD->method_end(); i != e; ++i) { 9045 CXXMethodDecl *MD = *i; 9046 9047 // C++ [basic.def.odr]p2: 9048 // [...] A virtual member function is used if it is not pure. [...] 9049 if (MD->isVirtual() && !MD->isPure()) 9050 MarkDeclarationReferenced(Loc, MD); 9051 } 9052 9053 // Only classes that have virtual bases need a VTT. 9054 if (RD->getNumVBases() == 0) 9055 return; 9056 9057 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9058 e = RD->bases_end(); i != e; ++i) { 9059 const CXXRecordDecl *Base = 9060 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9061 if (Base->getNumVBases() == 0) 9062 continue; 9063 MarkVirtualMembersReferenced(Loc, Base); 9064 } 9065} 9066 9067/// SetIvarInitializers - This routine builds initialization ASTs for the 9068/// Objective-C implementation whose ivars need be initialized. 9069void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9070 if (!getLangOptions().CPlusPlus) 9071 return; 9072 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9073 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9074 CollectIvarsToConstructOrDestruct(OID, ivars); 9075 if (ivars.empty()) 9076 return; 9077 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9078 for (unsigned i = 0; i < ivars.size(); i++) { 9079 FieldDecl *Field = ivars[i]; 9080 if (Field->isInvalidDecl()) 9081 continue; 9082 9083 CXXCtorInitializer *Member; 9084 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9085 InitializationKind InitKind = 9086 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9087 9088 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9089 ExprResult MemberInit = 9090 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9091 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9092 // Note, MemberInit could actually come back empty if no initialization 9093 // is required (e.g., because it would call a trivial default constructor) 9094 if (!MemberInit.get() || MemberInit.isInvalid()) 9095 continue; 9096 9097 Member = 9098 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9099 SourceLocation(), 9100 MemberInit.takeAs<Expr>(), 9101 SourceLocation()); 9102 AllToInit.push_back(Member); 9103 9104 // Be sure that the destructor is accessible and is marked as referenced. 9105 if (const RecordType *RecordTy 9106 = Context.getBaseElementType(Field->getType()) 9107 ->getAs<RecordType>()) { 9108 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9109 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9110 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9111 CheckDestructorAccess(Field->getLocation(), Destructor, 9112 PDiag(diag::err_access_dtor_ivar) 9113 << Context.getBaseElementType(Field->getType())); 9114 } 9115 } 9116 } 9117 ObjCImplementation->setIvarInitializers(Context, 9118 AllToInit.data(), AllToInit.size()); 9119 } 9120} 9121 9122static 9123void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9124 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9125 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9126 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9127 Sema &S) { 9128 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9129 CE = Current.end(); 9130 if (Ctor->isInvalidDecl()) 9131 return; 9132 9133 const FunctionDecl *FNTarget = 0; 9134 CXXConstructorDecl *Target; 9135 9136 // We ignore the result here since if we don't have a body, Target will be 9137 // null below. 9138 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9139 Target 9140= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9141 9142 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9143 // Avoid dereferencing a null pointer here. 9144 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9145 9146 if (!Current.insert(Canonical)) 9147 return; 9148 9149 // We know that beyond here, we aren't chaining into a cycle. 9150 if (!Target || !Target->isDelegatingConstructor() || 9151 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9152 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9153 Valid.insert(*CI); 9154 Current.clear(); 9155 // We've hit a cycle. 9156 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9157 Current.count(TCanonical)) { 9158 // If we haven't diagnosed this cycle yet, do so now. 9159 if (!Invalid.count(TCanonical)) { 9160 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9161 diag::warn_delegating_ctor_cycle) 9162 << Ctor; 9163 9164 // Don't add a note for a function delegating directo to itself. 9165 if (TCanonical != Canonical) 9166 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9167 9168 CXXConstructorDecl *C = Target; 9169 while (C->getCanonicalDecl() != Canonical) { 9170 (void)C->getTargetConstructor()->hasBody(FNTarget); 9171 assert(FNTarget && "Ctor cycle through bodiless function"); 9172 9173 C 9174 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9175 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9176 } 9177 } 9178 9179 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9180 Invalid.insert(*CI); 9181 Current.clear(); 9182 } else { 9183 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9184 } 9185} 9186 9187 9188void Sema::CheckDelegatingCtorCycles() { 9189 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9190 9191 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9192 CE = Current.end(); 9193 9194 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9195 I = DelegatingCtorDecls.begin(), 9196 E = DelegatingCtorDecls.end(); 9197 I != E; ++I) { 9198 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9199 } 9200 9201 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9202 (*CI)->setInvalidDecl(); 9203} 9204