C++ base_class_iterator::isVirtual方法代码示例

  void addSubNodes(CXXRecordDecl* RD) {
    addSubNodes(cast<RecordDecl>(RD));

    if (RD->isDefinition()) {
      // FIXME: This breaks XML generation
      //Doc.addAttribute("num_bases", RD->getNumBases());

      for (CXXRecordDecl::base_class_iterator 
             base = RD->bases_begin(),
             bend = RD->bases_end();
           base != bend;
           ++base) {
        Doc.addSubNode("Base");
        Doc.addAttribute("id", base->getType());
        AccessSpecifier as = base->getAccessSpecifierAsWritten();
        const char* as_name = "";
        switch(as) {
        case AS_none:      as_name = ""; break;
        case AS_public:    as_name = "public"; break;
        case AS_protected: as_name = "protected"; break;
        case AS_private:   as_name = "private"; break;
        }
        Doc.addAttributeOptional("access", as_name);
        Doc.addAttribute("is_virtual", base->isVirtual());
        Doc.toParent();
      }
    }
  }

/// Collect the visible conversions of a base class.
///
/// \param Base a base class of the class we're considering
/// \param InVirtual whether this base class is a virtual base (or a base
///   of a virtual base)
/// \param Access the access along the inheritance path to this base
/// \param ParentHiddenTypes the conversions provided by the inheritors
///   of this base
/// \param Output the set to which to add conversions from non-virtual bases
/// \param VOutput the set to which to add conversions from virtual bases
/// \param HiddenVBaseCs the set of conversions which were hidden in a
///   virtual base along some inheritance path
static void CollectVisibleConversions(ASTContext &Context,
                                      CXXRecordDecl *Record,
                                      bool InVirtual,
                                      AccessSpecifier Access,
                  const llvm::SmallPtrSet<CanQualType, 8> &ParentHiddenTypes,
                                      UnresolvedSetImpl &Output,
                                      UnresolvedSetImpl &VOutput,
                           llvm::SmallPtrSet<NamedDecl*, 8> &HiddenVBaseCs) {
  // The set of types which have conversions in this class or its
  // subclasses.  As an optimization, we don't copy the derived set
  // unless it might change.
  const llvm::SmallPtrSet<CanQualType, 8> *HiddenTypes = &ParentHiddenTypes;
  llvm::SmallPtrSet<CanQualType, 8> HiddenTypesBuffer;

  // Collect the direct conversions and figure out which conversions
  // will be hidden in the subclasses.
  UnresolvedSetImpl &Cs = *Record->getConversionFunctions();
  if (!Cs.empty()) {
    HiddenTypesBuffer = ParentHiddenTypes;
    HiddenTypes = &HiddenTypesBuffer;

    for (UnresolvedSetIterator I = Cs.begin(), E = Cs.end(); I != E; ++I) {
      bool Hidden =
        !HiddenTypesBuffer.insert(GetConversionType(Context, I.getDecl()));

      // If this conversion is hidden and we're in a virtual base,
      // remember that it's hidden along some inheritance path.
      if (Hidden && InVirtual)
        HiddenVBaseCs.insert(cast<NamedDecl>(I.getDecl()->getCanonicalDecl()));

      // If this conversion isn't hidden, add it to the appropriate output.
      else if (!Hidden) {
        AccessSpecifier IAccess
          = CXXRecordDecl::MergeAccess(Access, I.getAccess());

        if (InVirtual)
          VOutput.addDecl(I.getDecl(), IAccess);
        else
          Output.addDecl(I.getDecl(), IAccess);
      }
    }
  }

  // Collect information recursively from any base classes.
  for (CXXRecordDecl::base_class_iterator
         I = Record->bases_begin(), E = Record->bases_end(); I != E; ++I) {
    const RecordType *RT = I->getType()->getAs<RecordType>();
    if (!RT) continue;

    AccessSpecifier BaseAccess
      = CXXRecordDecl::MergeAccess(Access, I->getAccessSpecifier());
    bool BaseInVirtual = InVirtual || I->isVirtual();

    CXXRecordDecl *Base = cast<CXXRecordDecl>(RT->getDecl());
    CollectVisibleConversions(Context, Base, BaseInVirtual, BaseAccess,
                              *HiddenTypes, Output, VOutput, HiddenVBaseCs);
  }
}

void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
  // FIXME: add printing of pragma attributes if required.
  if (!Policy.SuppressSpecifiers && D->isModulePrivate())
    Out << "__module_private__ ";
  Out << D->getKindName();

  prettyPrintAttributes(D);

  if (D->getIdentifier()) {
    Out << ' ' << *D;

    if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
      printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
    else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
      printTemplateArguments(S->getTemplateArgs());
  }

  if (D->isCompleteDefinition()) {
    // Print the base classes
    if (D->getNumBases()) {
      Out << " : ";
      for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
             BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
        if (Base != D->bases_begin())
          Out << ", ";

        if (Base->isVirtual())
          Out << "virtual ";

        AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
        if (AS != AS_none) {
          Print(AS);
          Out << " ";
        }
        Out << Base->getType().getAsString(Policy);

        if (Base->isPackExpansion())
          Out << "...";
      }
    }

    // Print the class definition
    // FIXME: Doesn't print access specifiers, e.g., "public:"
    if (Policy.TerseOutput) {
      Out << " {}";
    } else {
      Out << " {\n";
      VisitDeclContext(D);
      Indent() << "}";
    }
  }
}

void ASTDumper::VisitCXXRecordDecl(CXXRecordDecl *D) {
  VisitRecordDecl(D);
  if (!D->isCompleteDefinition())
    return;

  for (CXXRecordDecl::base_class_iterator I = D->bases_begin(),
       E = D->bases_end(); I != E; ++I) {
    IndentScope Indent(*this);
    if (I->isVirtual())
      OS << "virtual ";
    dumpAccessSpecifier(I->getAccessSpecifier());
    dumpType(I->getType());
    if (I->isPackExpansion())
      OS << "...";
  }
}

/// getNestedVisibleConversionFunctions - imports unique conversion 
/// functions from base classes into the visible conversion function
/// list of the class 'RD'. This is a private helper method.
/// TopConversionsTypeSet is the set of conversion functions of the class
/// we are interested in. HiddenConversionTypes is set of conversion functions
/// of the immediate derived class which  hides the conversion functions found 
/// in current class.
void
CXXRecordDecl::getNestedVisibleConversionFunctions(CXXRecordDecl *RD,
                const llvm::SmallPtrSet<CanQualType, 8> &TopConversionsTypeSet,                               
                const llvm::SmallPtrSet<CanQualType, 8> &HiddenConversionTypes) 
{
  bool inTopClass = (RD == this);
  QualType ClassType = getASTContext().getTypeDeclType(this);
  if (const RecordType *Record = ClassType->getAs<RecordType>()) {
    const UnresolvedSetImpl *Cs
      = cast<CXXRecordDecl>(Record->getDecl())->getConversionFunctions();
    
    for (UnresolvedSetImpl::iterator I = Cs->begin(), E = Cs->end();
           I != E; ++I) {
      NamedDecl *Conv = *I;
      // Only those conversions not exact match of conversions in current
      // class are candidateconversion routines.
      CanQualType ConvType;
      if (FunctionTemplateDecl *ConversionTemplate = 
            dyn_cast<FunctionTemplateDecl>(Conv))
        ConvType = 
          getASTContext().getCanonicalType(
                      ConversionTemplate->getTemplatedDecl()->getResultType());
      else
        ConvType = 
          getASTContext().getCanonicalType(
                          cast<CXXConversionDecl>(Conv)->getConversionType());
      // We only add conversion functions found in the base class if they
      // are not hidden by those found in HiddenConversionTypes which are
      // the conversion functions in its derived class.
      if (inTopClass || 
          (!TopConversionsTypeSet.count(ConvType) && 
           !HiddenConversionTypes.count(ConvType)) ) {
        if (FunctionTemplateDecl *ConversionTemplate =
              dyn_cast<FunctionTemplateDecl>(Conv))
          RD->addVisibleConversionFunction(ConversionTemplate);
        else
          RD->addVisibleConversionFunction(cast<CXXConversionDecl>(Conv));
      }
    }
  }

  if (getNumBases() == 0 && getNumVBases() == 0)
    return;

  llvm::SmallPtrSet<CanQualType, 8> ConversionFunctions;
  if (!inTopClass)
    collectConversionFunctions(ConversionFunctions);

  for (CXXRecordDecl::base_class_iterator VBase = vbases_begin(),
       E = vbases_end(); VBase != E; ++VBase) {
    if (const RecordType *RT = VBase->getType()->getAs<RecordType>()) {
      CXXRecordDecl *VBaseClassDecl
        = cast<CXXRecordDecl>(RT->getDecl());
      VBaseClassDecl->getNestedVisibleConversionFunctions(RD,
                    TopConversionsTypeSet,
                    (inTopClass ? TopConversionsTypeSet : ConversionFunctions));
    }
  }
  for (CXXRecordDecl::base_class_iterator Base = bases_begin(),
       E = bases_end(); Base != E; ++Base) {
    if (Base->isVirtual())
      continue;
    if (const RecordType *RT = Base->getType()->getAs<RecordType>()) {
      CXXRecordDecl *BaseClassDecl
        = cast<CXXRecordDecl>(RT->getDecl());

      BaseClassDecl->getNestedVisibleConversionFunctions(RD,
                    TopConversionsTypeSet,
                    (inTopClass ? TopConversionsTypeSet : ConversionFunctions));
    }
  }
}