C++ NamedDecl::getCanonicalDecl方法代码示例

//.........这里部分代码省略.........
  }

  NamedDecl *SD =
      Found.isSingleResult() ? Found.getRepresentativeDecl() : nullptr;
  bool IsExtension = false;
  bool AcceptSpec = isAcceptableNestedNameSpecifier(SD, &IsExtension);
  if (!AcceptSpec && IsExtension) {
    AcceptSpec = true;
    Diag(IdInfo.IdentifierLoc, diag::ext_nested_name_spec_is_enum);
  }
  if (AcceptSpec) {
    if (!ObjectType.isNull() && !ObjectTypeSearchedInScope &&
        !getLangOpts().CPlusPlus11) {
      // C++03 [basic.lookup.classref]p4:
      //   [...] If the name is found in both contexts, the
      //   class-name-or-namespace-name shall refer to the same entity.
      //
      // We already found the name in the scope of the object. Now, look
      // into the current scope (the scope of the postfix-expression) to
      // see if we can find the same name there. As above, if there is no
      // scope, reconstruct the result from the template instantiation itself.
      //
      // Note that C++11 does *not* perform this redundant lookup.
      NamedDecl *OuterDecl;
      if (S) {
        LookupResult FoundOuter(*this, IdInfo.Identifier, IdInfo.IdentifierLoc,
                                LookupNestedNameSpecifierName);
        LookupName(FoundOuter, S);
        OuterDecl = FoundOuter.getAsSingle<NamedDecl>();
      } else
        OuterDecl = ScopeLookupResult;

      if (isAcceptableNestedNameSpecifier(OuterDecl) &&
          OuterDecl->getCanonicalDecl() != SD->getCanonicalDecl() &&
          (!isa<TypeDecl>(OuterDecl) || !isa<TypeDecl>(SD) ||
           !Context.hasSameType(
                            Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)),
                               Context.getTypeDeclType(cast<TypeDecl>(SD))))) {
        if (ErrorRecoveryLookup)
          return true;

         Diag(IdInfo.IdentifierLoc,
              diag::err_nested_name_member_ref_lookup_ambiguous)
           << IdInfo.Identifier;
         Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type)
           << ObjectType;
         Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope);

         // Fall through so that we'll pick the name we found in the object
         // type, since that's probably what the user wanted anyway.
       }
    }

    if (auto *TD = dyn_cast_or_null<TypedefNameDecl>(SD))
      MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);

    // If we're just performing this lookup for error-recovery purposes,
    // don't extend the nested-name-specifier. Just return now.
    if (ErrorRecoveryLookup)
      return false;

    // The use of a nested name specifier may trigger deprecation warnings.
    DiagnoseUseOfDecl(SD, IdInfo.CCLoc);

    if (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD)) {
      SS.Extend(Context, Namespace, IdInfo.IdentifierLoc, IdInfo.CCLoc);

//.........这里部分代码省略.........
          << FixItHint::CreateReplacement(Found.getNameLoc(), CorrectedStr);
      
      if (NamedDecl *ND = Corrected.getCorrectionDecl()) {
        Diag(ND->getLocation(), diag::note_previous_decl) << CorrectedQuotedStr;
        Found.addDecl(ND);
      }
      Found.setLookupName(Corrected.getCorrection());
    } else {
      Found.setLookupName(&Identifier);
    }
  }

  NamedDecl *SD = Found.getAsSingle<NamedDecl>();
  if (isAcceptableNestedNameSpecifier(SD)) {
    if (!ObjectType.isNull() && !ObjectTypeSearchedInScope) {
      // C++ [basic.lookup.classref]p4:
      //   [...] If the name is found in both contexts, the
      //   class-name-or-namespace-name shall refer to the same entity.
      //
      // We already found the name in the scope of the object. Now, look
      // into the current scope (the scope of the postfix-expression) to
      // see if we can find the same name there. As above, if there is no
      // scope, reconstruct the result from the template instantiation itself.
      NamedDecl *OuterDecl;
      if (S) {
        LookupResult FoundOuter(*this, &Identifier, IdentifierLoc, 
                                LookupNestedNameSpecifierName);
        LookupName(FoundOuter, S);
        OuterDecl = FoundOuter.getAsSingle<NamedDecl>();
      } else
        OuterDecl = ScopeLookupResult;

      if (isAcceptableNestedNameSpecifier(OuterDecl) &&
          OuterDecl->getCanonicalDecl() != SD->getCanonicalDecl() &&
          (!isa<TypeDecl>(OuterDecl) || !isa<TypeDecl>(SD) ||
           !Context.hasSameType(
                            Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)),
                               Context.getTypeDeclType(cast<TypeDecl>(SD))))) {
         if (ErrorRecoveryLookup)
           return true;

         Diag(IdentifierLoc, 
              diag::err_nested_name_member_ref_lookup_ambiguous)
           << &Identifier;
         Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type)
           << ObjectType;
         Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope);

         // Fall through so that we'll pick the name we found in the object
         // type, since that's probably what the user wanted anyway.
       }
    }

    // If we're just performing this lookup for error-recovery purposes, 
    // don't extend the nested-name-specifier. Just return now.
    if (ErrorRecoveryLookup)
      return false;
    
    if (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD)) {
      SS.Extend(Context, Namespace, IdentifierLoc, CCLoc);
      return false;
    }

    if (NamespaceAliasDecl *Alias = dyn_cast<NamespaceAliasDecl>(SD)) {
      SS.Extend(Context, Alias, IdentifierLoc, CCLoc);
      return false;

//.........这里部分代码省略.........
          << Name << LookupCtx << Found.getLookupName() << SS.getRange()
          << CodeModificationHint::CreateReplacement(Found.getNameLoc(),
                                           Found.getLookupName().getAsString());
      else
        Diag(Found.getNameLoc(), diag::err_undeclared_var_use_suggest)
          << Name << Found.getLookupName()
          << CodeModificationHint::CreateReplacement(Found.getNameLoc(),
                                           Found.getLookupName().getAsString());
      
      if (NamedDecl *ND = Found.getAsSingle<NamedDecl>())
        Diag(ND->getLocation(), diag::note_previous_decl)
          << ND->getDeclName();
    } else
      Found.clear();
  }

  NamedDecl *SD = Found.getAsSingle<NamedDecl>();
  if (isAcceptableNestedNameSpecifier(SD)) {
    if (!ObjectType.isNull() && !ObjectTypeSearchedInScope) {
      // C++ [basic.lookup.classref]p4:
      //   [...] If the name is found in both contexts, the
      //   class-name-or-namespace-name shall refer to the same entity.
      //
      // We already found the name in the scope of the object. Now, look
      // into the current scope (the scope of the postfix-expression) to
      // see if we can find the same name there. As above, if there is no
      // scope, reconstruct the result from the template instantiation itself.
      NamedDecl *OuterDecl;
      if (S) {
        LookupResult FoundOuter(*this, &II, IdLoc, LookupNestedNameSpecifierName);
        LookupName(FoundOuter, S);
        OuterDecl = FoundOuter.getAsSingle<NamedDecl>();
      } else
        OuterDecl = ScopeLookupResult;

      if (isAcceptableNestedNameSpecifier(OuterDecl) &&
          OuterDecl->getCanonicalDecl() != SD->getCanonicalDecl() &&
          (!isa<TypeDecl>(OuterDecl) || !isa<TypeDecl>(SD) ||
           !Context.hasSameType(
                            Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)),
                               Context.getTypeDeclType(cast<TypeDecl>(SD))))) {
             if (ErrorRecoveryLookup)
               return 0;
             
             Diag(IdLoc, diag::err_nested_name_member_ref_lookup_ambiguous)
               << &II;
             Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type)
               << ObjectType;
             Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope);

             // Fall through so that we'll pick the name we found in the object
             // type, since that's probably what the user wanted anyway.
           }
    }

    if (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD))
      return NestedNameSpecifier::Create(Context, Prefix, Namespace);

    // FIXME: It would be nice to maintain the namespace alias name, then
    // see through that alias when resolving the nested-name-specifier down to
    // a declaration context.
    if (NamespaceAliasDecl *Alias = dyn_cast<NamespaceAliasDecl>(SD))
      return NestedNameSpecifier::Create(Context, Prefix,

                                         Alias->getNamespace());

    QualType T = Context.getTypeDeclType(cast<TypeDecl>(SD));
    return NestedNameSpecifier::Create(Context, Prefix, false,
                                       T.getTypePtr());
  }

  // Otherwise, we have an error case.  If we don't want diagnostics, just
  // return an error now.
  if (ErrorRecoveryLookup)
    return 0;

  // If we didn't find anything during our lookup, try again with
  // ordinary name lookup, which can help us produce better error
  // messages.
  if (Found.empty()) {
    Found.clear(LookupOrdinaryName);
    LookupName(Found, S);
  }

  unsigned DiagID;
  if (!Found.empty())
    DiagID = diag::err_expected_class_or_namespace;
  else if (SS.isSet()) {
    Diag(IdLoc, diag::err_no_member) << &II << LookupCtx << SS.getRange();
    return 0;
  } else
    DiagID = diag::err_undeclared_var_use;

  if (SS.isSet())
    Diag(IdLoc, DiagID) << &II << SS.getRange();
  else
    Diag(IdLoc, DiagID) << &II;

  return 0;
}