// utl_scope.cpp,v 1.73 2002/10/22 22:22:44 parsons Exp

/*

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This product is protected by copyright and distributed under the following
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this product is incorporated in whole or part. You may copy and extend
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*/

#include "utl_scope.h"
#include "utl_identifier.h"
#include "utl_err.h"
#include "utl_indenter.h"
#include "utl_string.h"
#include "ast_valuetype.h"
#include "ast_valuetype_fwd.h"
#include "ast_eventtype.h"
#include "ast_eventtype_fwd.h"
#include "ast_component.h"
#include "ast_component_fwd.h"
#include "ast_home.h"
#include "ast_typedef.h"
#include "ast_type.h"
#include "ast_root.h"
#include "ast_array.h"
#include "ast_enum.h"
#include "ast_concrete_type.h"
#include "ast_sequence.h"
#include "ast_string.h"
#include "ast_structure_fwd.h"
#include "ast_exception.h"
#include "ast_constant.h"
#include "ast_attribute.h"
#include "ast_operation.h"
#include "ast_argument.h"
#include "ast_union.h"
#include "ast_union_fwd.h"
#include "ast_union_branch.h"
#include "ast_field.h"
#include "ast_enum_val.h"
#include "ast_native.h"
#include "ast_factory.h"
#include "ast_visitor.h"
#include "nr_extern.h"
#include "global_extern.h"

ACE_RCSID (util, 
           utl_scope, 
           "utl_scope.cpp,v 1.73 2002/10/22 22:22:44 parsons Exp")

#undef  INCREMENT
#define INCREMENT 64

// Static variables.
static Identifier *_global_scope_name = 0;
static Identifier *_global_scope_root_name = 0;

// Static functions.

// Determines if a name is global.
static long
is_global_name (Identifier *i)
{
  long comp_result = 0;

  if (i == 0)
    {
      return comp_result;
    }

  if (_global_scope_name == 0)
    {
      ACE_NEW_RETURN (_global_scope_name,
                      Identifier ("::"),
                      0);
    }

  if (_global_scope_root_name == 0)
    {
      ACE_NEW_RETURN (_global_scope_root_name,
                      Identifier (""),
                      0);
    }

  comp_result = i->compare (_global_scope_name);

  if (comp_result == 0)
    {
      comp_result = i->compare (_global_scope_root_name);
    }

  return comp_result;
}

// Helper function for lookup_by_name. Iterates doing local lookups of
// subsequent components of a scoped name.
static AST_Decl *
iter_lookup_by_name_local (AST_Decl *d,
                           UTL_ScopedName *e,
                           long index)
{
  AST_Typedef *td = AST_Typedef::narrow_from_decl (d);
  AST_Decl *result = 0;

  // Remove all the layers of typedefs.
  while (d != NULL && d->node_type () == AST_Decl::NT_typedef)
    {
      if (td == 0)
        {
          return 0;
        }

      d = td->base_type ();
    }

  if (d == 0)
    {
      return 0;
    }

  // Try to convert the AST_Decl to a UTL_Scope.
  UTL_Scope *sc = DeclAsScope (d);

  if (sc == 0)
    {
      return 0;
    }

  if (index < ACE_static_cast (long, sc->nmembers ()))
    {
      // Look up the first component of the scoped name.
      result = sc->lookup_by_name_local (e->head (),
                                         index);
    }
  else
    {
      return 0;
    }


  if (result == 0)
    {
      return 0;
    }
  else
    {
      UTL_ScopedName *sn = (UTL_ScopedName *) e->tail ();

      if (sn == 0)
        {
          // We're done.
          return result;
        }
      else
        {
          // Look up the next component of the scoped name.
          result = iter_lookup_by_name_local (result,
                                              sn,
                                              0);
        }

      if (result != 0)
        {
          // We're done.
          return result;
        }
      else
        {
          // Maybe we're on the wrong branch of reopened
          // and/or nested modules, so let's see if there's
          // another branch. If 'index' gets as high as the
          // number of members in the scope, the call above
          // to lookup_by_name_local will catch it and return 0.
          return iter_lookup_by_name_local (d,
                                            e,
                                            index + 1);
        }
    }
}

//  Constructors.

UTL_Scope::UTL_Scope (void)
  : pd_scope_node_type (AST_Decl::NT_module),
    pd_decls (0),
    pd_decls_allocated (0),
    pd_decls_used (0),
    pd_local_types (0),
    pd_locals_allocated (0),
    pd_locals_used (0),
    pd_referenced (0),
    pd_referenced_allocated (0),
    pd_referenced_used (0),
    pd_name_referenced (0),
    pd_name_referenced_allocated (0),
    pd_name_referenced_used (0),
    has_prefix_ (0)
{
}

UTL_Scope::UTL_Scope (AST_Decl::NodeType nt)
  : pd_scope_node_type (nt),
    pd_decls (0),
    pd_decls_allocated (0),
    pd_decls_used (0),
    pd_local_types (0),
    pd_locals_allocated (0),
    pd_locals_used (0),
    pd_referenced (0),
    pd_referenced_allocated (0),
    pd_referenced_used (0),
    pd_name_referenced (0),
    pd_name_referenced_allocated (0),
    pd_name_referenced_used (0),
    has_prefix_ (0)
{
}

// Destructor.
UTL_Scope::~UTL_Scope (void)
{
}

// Private operations.

static AST_Decl *
add_type (AST_Type *type)
{
  AST_Decl *result = 0;
  UTL_Scope *scope = 0;

  switch (type->node_type())
    {
    case AST_Decl::NT_array:
      result =
        idl_global->root ()->add_array (AST_Array::narrow_from_decl (type));
      break;
    case AST_Decl::NT_enum:
      result =
        type->defined_in ()->add_enum (AST_Enum::narrow_from_decl (type));
      scope = AST_Enum::narrow_from_decl (type);
      break;
    case AST_Decl::NT_sequence:
      result =
        idl_global->root ()->add_sequence (
                                 AST_Sequence::narrow_from_decl (type)
                               );
      break;
    case AST_Decl::NT_string:
    case AST_Decl::NT_wstring:
      result =
        idl_global->root ()->add_string (AST_String::narrow_from_decl (type));
      break;
    case AST_Decl::NT_struct:
      result =
        type->defined_in ()->add_structure (
                                 AST_Structure::narrow_from_decl (type)
                               );
      scope = AST_Structure::narrow_from_decl (type);
      break;
    case AST_Decl::NT_union:
      result =
        type->defined_in ()->add_union (AST_Union::narrow_from_decl (type));
      scope = AST_Union::narrow_from_decl (type);
      break;
    default:
      // For non-complex types, like predefined types
      // no additional add needed, assume everything is ok.
      result = (AST_Decl *) 1;
      break;
    }

  if (scope != 0)
    {
      result = scope->call_add ();
    }

  return result;
}

// Protected operations.

// Special version of lookup which only looks at the local name instead of
// the fully scoped name, when doing lookups. This version is intended to
// be used only by the CFE add_xxx functions.
AST_Decl *
UTL_Scope::lookup_for_add (AST_Decl *d,
                           idl_bool)
{
  if (d == 0)
    {
      return 0;
    }

  Identifier *id = d->local_name ();

  if (this->idl_keyword_clash (id) != 0)
    {
      return 0;
    }

  return this->lookup_by_name_local (id,
                                     0);
}

int
UTL_Scope::idl_keyword_clash (Identifier *e)
{
  if (e->escaped ())
    {
      return 0;
    }

  char *tmp = e->get_string ();

  UTL_String utl_tmp (tmp);

  ACE_CString ext_id (utl_tmp.get_canonical_rep (),
                      0,
                      0);

  int status = idl_global->idl_keywords ().find (ext_id);

  utl_tmp.destroy ();

  if (status == 0)
    {
      if (idl_global->case_diff_error ())
        {
          idl_global->err ()->idl_keyword_error (tmp);
        }
      else
        {
          idl_global->err ()->idl_keyword_warning (tmp);
        }

      return -1;
    }

  return 0;
}

idl_bool
UTL_Scope::redef_clash (AST_Decl::NodeType new_nt,
                        AST_Decl::NodeType scope_elem_nt)
{
  switch (new_nt)
  {
    case AST_Decl::NT_module:
      return scope_elem_nt != AST_Decl::NT_module;
    case AST_Decl::NT_struct:
    case AST_Decl::NT_struct_fwd:
      return scope_elem_nt != AST_Decl::NT_struct_fwd;
    case AST_Decl::NT_union:
    case AST_Decl::NT_union_fwd:
      return scope_elem_nt != AST_Decl::NT_union_fwd;
    case AST_Decl::NT_interface:
      return scope_elem_nt != AST_Decl::NT_interface_fwd;
    case AST_Decl::NT_interface_fwd:
      return (scope_elem_nt != AST_Decl::NT_interface_fwd
              && scope_elem_nt != AST_Decl::NT_interface);
    case AST_Decl::NT_valuetype:
      return scope_elem_nt != AST_Decl::NT_valuetype_fwd;
    case AST_Decl::NT_valuetype_fwd:
      return (scope_elem_nt != AST_Decl::NT_valuetype_fwd
              && scope_elem_nt != AST_Decl::NT_valuetype);
    default:
      return I_TRUE;
  }
}

// Public operations.

// Scope Management Protocol.
//
// All members of the protocol defined in UTL_Scope simply return the node
// and don't do a thing. These members are simply dummies to retain
// compatibility with pre-two-pass compiler back-ends.

AST_PredefinedType *
UTL_Scope::add_predefined_type (AST_PredefinedType *p)
{
  if (p == 0)
    {
      return 0;
    }

  p->set_added (I_TRUE);
  return p;
}

AST_Module *
UTL_Scope::add_module (AST_Module *m)
{
  if (m == 0)
    {
      return 0;
    }

  m->set_added (I_TRUE);
  return m;
}

AST_Interface *
UTL_Scope::add_interface (AST_Interface *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_InterfaceFwd *
UTL_Scope::add_interface_fwd (AST_InterfaceFwd *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_ValueType *
UTL_Scope::add_valuetype (AST_ValueType *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_ValueTypeFwd *
UTL_Scope::add_valuetype_fwd (AST_ValueTypeFwd *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_EventType *
UTL_Scope::add_eventtype (AST_EventType *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_EventTypeFwd *
UTL_Scope::add_eventtype_fwd (AST_EventTypeFwd *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_Component *
UTL_Scope::add_component (AST_Component *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_ComponentFwd *
UTL_Scope::add_component_fwd (AST_ComponentFwd *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_Home *
UTL_Scope::add_home (AST_Home *i)
{
  if (i == 0)
    {
      return 0;
    }

  i->set_added (I_TRUE);
  return i;
}

AST_Exception *
UTL_Scope::add_exception (AST_Exception *e)
{
  if (e == 0)
    {
      return 0;
    }

  e->set_added (I_TRUE);
  return e;
}

AST_Constant *
UTL_Scope::add_constant (AST_Constant *c)
{
  if (c == 0)
    {
      return 0;
    }

  c->set_added (I_TRUE);
  return c;
}

UTL_StrList *
UTL_Scope::add_context (UTL_StrList *c)
{
  return c;
}

UTL_NameList *
UTL_Scope::add_exceptions (UTL_NameList *e)
{
  return e;
}

AST_Attribute *
UTL_Scope::add_attribute (AST_Attribute *a)
{
  if (a == 0)
    {
      return 0;
    }

  a->set_added (I_TRUE);

  if (!a->field_type ()->added ())
    {
      return add_type (a->field_type ()) ? a : 0;
    }
  else
    {
      return a;
    }
}

AST_Operation *
UTL_Scope::add_operation (AST_Operation *o)
{
  if (o == 0)
    {
      return 0;
    }

  o->set_added (I_TRUE);

  if (!o->return_type ()->added ())
    {
      return add_type (o->return_type ()) ? o : 0;
    }
  else
    {
      return o;
    }
}

AST_Argument *
UTL_Scope::add_argument (AST_Argument *a)
{
  if (a == 0)
    {
      return 0;
    }

  a->set_added (I_TRUE);

  if (!a->field_type ()->added ())
    {
      return add_type (a->field_type ()) ? a : 0;
    }
  else
    {
      return a;
    }
}

AST_Union *
UTL_Scope::add_union (AST_Union *u)
{
  if (u == 0)
    {
      return 0;
    }

  u->set_added (I_TRUE);
  return u;
}

AST_UnionFwd *
UTL_Scope::add_union_fwd (AST_UnionFwd *u)
{
  if (u == 0)
    {
      return 0;
    }

  u->set_added (I_TRUE);
  return u;
}

AST_UnionBranch *
UTL_Scope::add_union_branch (AST_UnionBranch *u)
{
  if (u == 0)
    {
      return 0;
    }

  u->set_added (I_TRUE);

  if (!u->field_type ()->added ())
    {
      return add_type (u->field_type ()) ? u : 0;
    }
  else
    {
      return u;
    }
}

AST_Structure *
UTL_Scope::add_structure (AST_Structure *s)
{
  if (s == 0)
    {
      return 0;
    }

  s->set_added (I_TRUE);
  return s;
}

AST_StructureFwd *
UTL_Scope::add_structure_fwd (AST_StructureFwd *s)
{
  if (s == 0)
    {
      return 0;
    }

  s->set_added (I_TRUE);
  return s;
}

AST_Field *
UTL_Scope::add_field (AST_Field *f)
{
  if (f == 0)
    {
      return 0;
    }

  f->set_added (I_TRUE);

  if (!f->field_type ()->added ())
    {
      return add_type (f->field_type ()) ? f : 0;
    }
  else
    {
      return f;
    }
}

AST_Enum *
UTL_Scope::add_enum (AST_Enum *e)
{
  if (e == 0)
    {
      return 0;
    }

  e->set_added (I_TRUE);
  return e;
}

AST_EnumVal *
UTL_Scope::add_enum_val (AST_EnumVal *e)
{
  if (e == 0)
    {
      return 0;
    }

  e->set_added (I_TRUE);
  return e;
}

AST_Typedef *
UTL_Scope::add_typedef (AST_Typedef *t)
{
  if (t == 0)
    {
      return 0;
    }

  t->set_added (I_TRUE);
  if (!t->base_type ()->added ())
    {
      return add_type (t->base_type ()) ? t : 0;
    }
  else
    {
      return t;
    }
}

AST_Sequence *
UTL_Scope::add_sequence (AST_Sequence *s)
{
  if (s == 0)
    {
      return 0;
    }

  s->set_added (I_TRUE);

  if (!s->base_type ()->added ())
    {
      return add_type (s->base_type ()) ? s : 0;
    }
  else
    {
      return s;
    }
}

AST_String *
UTL_Scope::add_string (AST_String *s)
{
  if (s == 0)
    {
      return 0;
    }

  s->set_added (I_TRUE);
  return s;
}

AST_Array *
UTL_Scope::add_array (AST_Array *a)
{
  if (a == 0)
    {
      return 0;
    }

  a->set_added (I_TRUE);

  if (!a->base_type ()->added ())
    {
      return add_type (a->base_type ()) ? a : 0;
    }
  else
    {
      return a;
    }
}

AST_Native *
UTL_Scope::add_native (AST_Native *n)
{
  if (n == 0)
    {
      return 0;
    }

  n->set_added (I_TRUE);
  return n;
}

AST_Factory *
UTL_Scope::add_factory (AST_Factory *f)
{
  //We don't invite any new types so there is nothing actually to add
  if (f == 0)
    {
      return 0;
    }

  f->set_added (I_TRUE);
  return f;
}

// Protected Front End Scope Management Protocol.
//
// All members of the protocol defined in UTL_Scope simply return NULL
// and don't do a thing. This ensures that runtime errors will discover
// operations which should have been redefined to allow certain kinds of
// AST nodes to appear in a given context.

AST_PredefinedType *
UTL_Scope::fe_add_predefined_type (AST_PredefinedType *)
{
  return 0;
}

AST_Module *
UTL_Scope::fe_add_module (AST_Module *)
{
  return NULL;
}

AST_Interface *
UTL_Scope::fe_add_interface (AST_Interface *)
{
  return 0;
}

AST_InterfaceFwd *
UTL_Scope::fe_add_interface_fwd (AST_InterfaceFwd *)
{
  return 0;
}

AST_ValueType *
UTL_Scope::fe_add_valuetype (AST_ValueType *)
{
  return 0;
}

AST_ValueTypeFwd *
UTL_Scope::fe_add_valuetype_fwd (AST_ValueTypeFwd *)
{
  return 0;
}

AST_EventType *
UTL_Scope::fe_add_eventtype (AST_EventType *)
{
  return 0;
}

AST_EventTypeFwd *
UTL_Scope::fe_add_eventtype_fwd (AST_EventTypeFwd *)
{
  return 0;
}

AST_Component *
UTL_Scope::fe_add_component (AST_Component *)
{
  return 0;
}

AST_ComponentFwd *
UTL_Scope::fe_add_component_fwd (AST_ComponentFwd *)
{
  return 0;
}

AST_Home *
UTL_Scope::fe_add_home (AST_Home *)
{
  return 0;
}

AST_Exception *
UTL_Scope::fe_add_exception (AST_Exception *)
{
  return 0;
}

AST_Constant *
UTL_Scope::fe_add_constant (AST_Constant *)
{
  return 0;
}

UTL_StrList *
UTL_Scope::fe_add_context (UTL_StrList *)
{
  return 0;
}

UTL_NameList *
UTL_Scope::fe_add_exceptions (UTL_NameList *)
{
  return 0;
}

AST_Attribute *
UTL_Scope::fe_add_attribute (AST_Attribute *)
{
  return 0;
}

AST_Operation *
UTL_Scope::fe_add_operation (AST_Operation *)
{
  return 0;
}

AST_Argument *
UTL_Scope::fe_add_argument (AST_Argument *)
{
  return 0;
}

AST_Union *
UTL_Scope::fe_add_union (AST_Union *)
{
  return 0;
}

AST_UnionFwd *
UTL_Scope::fe_add_union_fwd (AST_UnionFwd *)
{
  return 0;
}

AST_UnionBranch *
UTL_Scope::fe_add_union_branch (AST_UnionBranch *)
{
  return 0;
}

AST_Structure *
UTL_Scope::fe_add_structure (AST_Structure *)
{
  return 0;
}

AST_StructureFwd *
UTL_Scope::fe_add_structure_fwd (AST_StructureFwd *)
{
  return 0;
}

AST_Field *
UTL_Scope::fe_add_field (AST_Field *)
{
  return 0;
}

AST_Enum *
UTL_Scope::fe_add_enum (AST_Enum *)
{
  return 0;
}

AST_EnumVal *
UTL_Scope::fe_add_enum_val (AST_EnumVal *)
{
  return 0;
}

AST_Typedef *
UTL_Scope::fe_add_typedef (AST_Typedef *)
{
  return 0;
}

AST_Sequence *
UTL_Scope::fe_add_sequence (AST_Sequence *)
{
  return 0;
}

AST_String *
UTL_Scope::fe_add_string (AST_String *)
{
  return 0;
}

AST_Array *
UTL_Scope::fe_add_array (AST_Array *)
{
  return 0;
}

AST_Native *
UTL_Scope::fe_add_native (AST_Native *)
{
  return 0;
}

AST_Factory *
UTL_Scope::fe_add_factory (AST_Factory *)
{
  return 0;
}

// This is the second pass of the front end
// It calls the public add protocol on everything in scope.
// It calls the add_xx functions of the most derived AST_Node.

AST_Decl *
UTL_Scope::call_add (void)
{
  AST_Decl *result = 0;
  AST_Decl *decl = 0;

  UTL_ScopeActiveIterator i (this,
                             UTL_Scope::IK_decls);
  UTL_Scope *scope = 0;

  while (!i.is_done ())
    {
      decl = i.item ();
      scope = 0;

      switch (decl->node_type ())
        {
        case AST_Decl::NT_argument:
          result = add_argument (AST_Argument::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_array:
          result = add_array (AST_Array::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_attr:
          result = add_attribute (AST_Attribute::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_const:
          result = add_constant (AST_Constant::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_enum:
          scope = AST_Enum::narrow_from_decl (decl);
          result = add_enum (AST_Enum::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_enum_val:
          result = add_enum_val (AST_EnumVal::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_except:
          scope = AST_Exception::narrow_from_decl (decl);
          result = add_exception (AST_Exception::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_field:
          result = add_field (AST_Field::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_interface:
          scope = AST_Interface::narrow_from_decl (decl);
          result = add_interface (AST_Interface::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_interface_fwd:
          result =
            add_interface_fwd (AST_InterfaceFwd::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_module:
          scope = AST_Module::narrow_from_decl (decl);
          result = add_module (AST_Module::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_native:
          result = add_native (AST_Native::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_op:
          result = add_operation (AST_Operation::narrow_from_decl (decl));
          scope = AST_Operation::narrow_from_decl (decl);
          break;
        case AST_Decl::NT_pre_defined:
          result =
            add_predefined_type (AST_PredefinedType::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_sequence:
          result = add_sequence (AST_Sequence::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_string:
        case AST_Decl::NT_wstring:
          result = add_string (AST_String::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_struct:
          result = add_structure (AST_Structure::narrow_from_decl (decl));
          scope = AST_Structure::narrow_from_decl (decl);
          break;
        case AST_Decl::NT_typedef:
          result = add_typedef (AST_Typedef::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_union:
          result = add_union (AST_Union::narrow_from_decl (decl));
          scope = AST_Union::narrow_from_decl (decl);
          break;
        case AST_Decl::NT_union_branch:
          result =
            add_union_branch (AST_UnionBranch::narrow_from_decl (decl));
          break;
        case AST_Decl::NT_factory:
          result = add_factory (AST_Factory::narrow_from_decl (decl));
          scope = AST_Factory::narrow_from_decl (decl);
          break;
        default:
          return 0;
        }

      if (scope != 0)
        {
          scope->call_add ();
        }

      i.next ();
    }

  return result;
}

// Private lookup mechanism.

// For dealing with lookups of 'Object' and 'TypeCode'.
AST_Decl *
UTL_Scope::lookup_pseudo (Identifier *e)
{
  if (e->escaped ())
    {
      return 0;
    }

  Identifier *item_name = 0;
  AST_Decl *d = 0;
  UTL_ScopeActiveIterator *i = 0;
  char *name_string = e->get_string ();

  if (ACE_OS::strcmp (name_string, "Object") == 0
      || ACE_OS::strcmp (name_string, "ValueBase") == 0)
    {
      // Iterate over the global scope.
      ACE_NEW_RETURN (i,
                      UTL_ScopeActiveIterator (
                              idl_global->scopes ().bottom (),
                              UTL_Scope::IK_decls),
                      0);
    }
  else if (ACE_OS::strcmp (name_string, "TypeCode") == 0
           || ACE_OS::strcmp (name_string, "TCKind") == 0)
    {
      // Occurrences of "TypeCode" or TCKind in IDL files must be
      // scoped with "CORBA" so we know we'll be in the CORBA module
      // if we get this far, and we can use "this" for the scope of
      // the iterator.
      ACE_NEW_RETURN (i,
                      UTL_ScopeActiveIterator (this,
                                               UTL_Scope::IK_decls),
                      0);
    }
  else
    {
      return 0;
    }

  for (;!i->is_done (); i->next ())
    {
      d = i->item ();

      item_name = d->local_name ();

      if (e->compare (item_name))
        {
          delete i;
          return d;
        }
    }

  delete i;
  return 0;
}

// Lookup the node for a primitive (built in) type.
AST_Decl *
UTL_Scope::lookup_primitive_type (AST_Expression::ExprType et)
{
  AST_PredefinedType::PredefinedType pdt;

  AST_Decl *as_decl = ScopeAsDecl (this);

  if (as_decl == 0)
    {
      return 0;
    }

  UTL_Scope *ancestor = as_decl->defined_in ();

  if (ancestor != 0)
    {
      return ancestor->lookup_primitive_type (et);
    }

  switch (et)
    {
    case AST_Expression::EV_short:
      pdt = AST_PredefinedType::PT_short;
      break;
    case AST_Expression::EV_ushort:
      pdt = AST_PredefinedType::PT_ushort;
      break;
    case AST_Expression::EV_long:
      pdt = AST_PredefinedType::PT_long;
      break;
    case AST_Expression::EV_ulong:
      pdt = AST_PredefinedType::PT_ulong;
      break;
    case AST_Expression::EV_longlong:
      pdt = AST_PredefinedType::PT_longlong;
      break;
    case AST_Expression::EV_ulonglong:
      pdt = AST_PredefinedType::PT_ulonglong;
      break;
    case AST_Expression::EV_float:
      pdt = AST_PredefinedType::PT_float;
      break;
    case AST_Expression::EV_double:
      pdt = AST_PredefinedType::PT_double;
      break;
    case AST_Expression::EV_longdouble:
      pdt = AST_PredefinedType::PT_longdouble;
      break;
    case AST_Expression::EV_char:
      pdt = AST_PredefinedType::PT_char;
      break;
    case AST_Expression::EV_wchar:
      pdt = AST_PredefinedType::PT_wchar;
      break;
    case AST_Expression::EV_octet:
      pdt = AST_PredefinedType::PT_octet;
      break;
    case AST_Expression::EV_bool:
      pdt = AST_PredefinedType::PT_boolean;
      break;
    case AST_Expression::EV_any:
      pdt = AST_PredefinedType::PT_any;
      break;
    case AST_Expression::EV_object:
      pdt = AST_PredefinedType::PT_object;
      break;
    case AST_Expression::EV_void:
      pdt = AST_PredefinedType::PT_void;
      break;
    case AST_Expression::EV_enum:
    case AST_Expression::EV_string:
    case AST_Expression::EV_wstring:
    case AST_Expression::EV_none:
    default:
      return 0;
    }

  AST_PredefinedType *t = 0;

  for (UTL_ScopeActiveIterator i (this, UTL_Scope::IK_decls);
       !i.is_done();
       i.next ())
    {
      as_decl = i.item ();

      if (as_decl->node_type () == AST_Decl::NT_pre_defined)
        {
          t = AST_PredefinedType::narrow_from_decl (as_decl);

          if (t == 0)
            {
              continue;
            }

          if (t->pt () == pdt)
            {
              return t;
            }
        }
    }

  return 0;
}

// Look through inherited interfaces.
AST_Decl *
UTL_Scope::look_in_inherited (UTL_ScopedName *e,
                              idl_bool treat_as_ref)
{
  AST_Decl *d = 0;
  AST_Decl *d_before = 0;
  AST_Interface *i = AST_Interface::narrow_from_scope (this);
  AST_Interface **is = 0;
  long nis = -1;

  // This scope is not an interface.
  if (i == 0)
    {
      return 0;
    }

  // Can't look in an interface which was not yet defined.
  if (!i->is_defined ())
    {
      idl_global->err ()->fwd_decl_lookup (i,
                                           e);
      return 0;
    }

  // OK, loop through inherited interfaces.

  // (Don't leave the inheritance hierarchy, no module or global ...)
  // Find all and report ambiguous results as error.

  for (nis = i->n_inherits (), is = i->inherits (); nis > 0; nis--, is++)
    {
      d = (*is)->lookup_by_name (e,
                                 treat_as_ref,
                                 0 /* not in parent */);
      if (d != 0)
        {
          if (d_before == 0)
            {
              // First result found.
              d_before = d;
            }
          else
            {
              // Conflict against further results?
              if (d != d_before)
                {
                  ACE_ERROR ((LM_ERROR,
                              "warning in %s line %d: ",
                              idl_global->filename ()->get_string (),
                              idl_global->lineno ()));

                  e->dump (*ACE_DEFAULT_LOG_STREAM);

                  ACE_ERROR ((LM_ERROR,
                              " is ambiguous in scope.\n"
                              "Found "));

                  d->name ()->dump (*ACE_DEFAULT_LOG_STREAM);

                  ACE_ERROR ((LM_ERROR,
                              " and "));

                  d_before->name ()->dump (*ACE_DEFAULT_LOG_STREAM);

                  ACE_ERROR ((LM_ERROR,
                              ".\n"));
                }
            }
        }
    }

  return d_before;
}

// Look up a String * in local scope only.
AST_Decl *
UTL_Scope::lookup_by_name_local (Identifier *e,
                                 long index)
{
  if (index > 0 && index == (long) this->nmembers ())
    {
      return 0;
    }

  // Will return 0 unless looking up 'Object' or 'TypeCode'.
  AST_Decl *d = this->lookup_pseudo (e);

  if (d != 0)
    {
      return d;
    }

  if (this->idl_keyword_clash (e) != 0)
    {
      return 0;
    }

  Identifier *item_name = 0;

  idl_bool in_corba =
    ACE_OS::strcmp (e->get_string (), "CORBA") == 0;

  // Iterate over this scope.
  for (UTL_ScopeActiveIterator i (this, UTL_Scope::IK_both);
       !i.is_done ();
       i.next ())
    {
      d = i.item ();

      item_name = d->local_name ();

      if (item_name == 0)
        {
          continue;
        }

      // Right now we populate the global scope with all the CORBA basic
      // types, so something like 'ULong' in an IDL file will find a
      // match, unless we skip over these items. This is a workaround until
      // there's time to fix the code generation for CORBA basic types.
      if (!in_corba
          && ACE_OS::strcmp (d->name ()->head ()->get_string (), "CORBA") == 0)
        {
          continue;
        }

      if (e->case_compare (item_name))
        {
          if (index == 0)
            {
              AST_Decl::NodeType nt = d->node_type ();

              // Special case for forward declared interfaces,
              // In this case, we want to return
              // the full definition member, whether defined yet or not
              if (nt == AST_Decl::NT_interface_fwd
                  || nt == AST_Decl::NT_valuetype_fwd
                  || nt == AST_Decl::NT_component_fwd)
                {
                  d = AST_InterfaceFwd::narrow_from_decl (d)->full_definition ();
                }
              else if (nt == AST_Decl::NT_struct_fwd
                       || nt == AST_Decl::NT_union_fwd)
                {
                  d = AST_StructureFwd::narrow_from_decl (d)->full_definition ();
                }

              return d;
            }
          else
          // If the index has been incremented, it means the identifier
          // matched on a previous call to this function, but after
          // returning, the rest of the scoped name didn't match. So we
          // see if there's another matching identifier to the 'head' of
          // the scoped name we're working with.
            {
              index--;
              continue;
            }
        }
    }

  // OK, not found, check if this scope is a module, and if so,
  // look in previous openings, if any.
  d = ScopeAsDecl (this);

  if (d->node_type () == AST_Decl::NT_module)
    {
      AST_Module *m = AST_Module::narrow_from_decl (d);

      return m->look_in_previous (e);
    }
  else
    {
      return 0;
    }
}

// Implements lookup by name for scoped names.
AST_Decl *
UTL_Scope::lookup_by_name (UTL_ScopedName *e,
                           idl_bool treat_as_ref,
                           idl_bool in_parent)
{
  AST_Decl *d = 0;
  UTL_Scope *t = 0;

  // Empty name? Error.
  if (e == 0)
    {
      return 0;
    }

  // If name starts with "::" or "" start lookup in global scope.
  if (is_global_name (e->head ()))
    {
     // Get parent scope.
      d = ScopeAsDecl (this);

      if (d == 0)
        {
          return 0;
        }

      t = d->defined_in ();

      // If this is the global scope..
      if (t == 0)
        {
          // Look up tail of name starting here.
          d = lookup_by_name ((UTL_ScopedName *) e->tail (),
                              treat_as_ref,
                              in_parent);

          // Now return whatever we have.
          return d;
        }

      // OK, not global scope yet, so simply iterate with parent scope.
      d = t->lookup_by_name (e,
                             treat_as_ref,
                             in_parent);

      // If treat_as_ref is true and d is not NULL, add d to
      // set of nodes referenced here.
      if (treat_as_ref && d != 0)
        {
          add_to_referenced (d,
                             I_FALSE,
                             0);
        }

      // Now return what we have.
      return d;
    }

  // The name does not start with "::"
  // Is name defined here?
  long index = 0;

  while (1)
    {
      d = lookup_by_name_local (e->head (),
                                index);

      if (d == 0)
        {

          // Special case for scope which is an interface or value type.
          // We have to look in the inherited interfaces as well.
          // Look before parent scopes.
          if (pd_scope_node_type == AST_Decl::NT_interface
              || pd_scope_node_type == AST_Decl::NT_valuetype
              || pd_scope_node_type == AST_Decl::NT_component
              || pd_scope_node_type == AST_Decl::NT_eventtype)
            {
              d = look_in_inherited (e,
                                     treat_as_ref);
            }

          if ((d == 0) && in_parent && idl_global->err_count () == 0)
            {

              // OK, not found. Go down parent scope chain.
              d = ScopeAsDecl (this);

              if (d != 0)
                {
                  t = d->defined_in ();

                  if (t == 0)
                    {
                      d = 0;
                    }
                  else
                    {
                      d = t->lookup_by_name (e,
                                             treat_as_ref,
                                             in_parent);
                    }
                }
            }

          // If treat_as_ref is true and d is not NULL, add d to
          // set of nodes referenced here.
          if (treat_as_ref && d != 0)
            {
              AST_Type *t = AST_Type::narrow_from_decl (d);

              // Are we a type, rather than an identifier?
              if (t != 0)
                {
                  // Are we defined in this scope or just referenced?
                  if (d->defined_in () == this)
                    {
                      UTL_Scope *s = ScopeAsDecl (this)->defined_in ();

                      if (s != 0)
                        {
                          AST_Decl *parent = ScopeAsDecl (s);
                          AST_Decl::NodeType nt = parent->node_type ();

                          // If the scope we are defined in is itself
                          // inside a module, then we should also
                          // be exported to the enclosing scope,
                          // recursive until we get to the enclosing
                          // module (or root) scope. (CORBA 2.6 3.15.3).
                          while (nt != AST_Decl::NT_module
                                 && nt != AST_Decl::NT_root)
                            {
                              s->add_to_referenced (d,
                                                    I_FALSE,
                                                    d->local_name ());

                              s = parent->defined_in ();
                              parent = ScopeAsDecl (s);
                              nt = parent->node_type ();
                            }
                        }
                    }
                }
            }

          // OK, now return whatever we found.
          return d;
        }

      // For the possible call to look_in_inherited() below.
      AST_Decl::NodeType nt = d->node_type ();
      t = DeclAsScope (d);

      // OK, start of name is defined. Now loop doing local lookups
      // of subsequent elements of the name, if any.
      UTL_ScopedName *sn = (UTL_ScopedName *) e->tail ();

      if (sn != 0)
        {
          d = iter_lookup_by_name_local (d,
                                         sn,
                                         0);
        }

      // If the start of the scoped name is an interface, and the
      // above lookup failed, it's possible that what we're looking
      // up was inherited into that interface. The first call to
      // look_in_inherited() is this function only checks base classes
      // of the scope (interface) we started the lookup from.
      if (d == 0 && nt == AST_Decl::NT_interface)
        {
          d = t->look_in_inherited (sn,
                                    treat_as_ref);
        }

      // If treat_as_ref is true and d is not 0, add d to
      // set of nodes referenced here.
      if (treat_as_ref && d != 0)
        {
          add_to_referenced (d,
                             I_FALSE,
                             0);
        }

      // All OK, name fully resolved.
      if (d != 0)
        {
          return d;
        }
      else
        {
          index++;
        }
    }
}

// Add a node to set of nodes referenced in this scope.
void
UTL_Scope::add_to_referenced (AST_Decl *e,
                              idl_bool recursive,
                              Identifier *id,
                              AST_Decl *ex)
{
  UTL_Scope *s = 0;
  AST_Decl **tmp;
  AST_Interface *itf = 0;
  long oreferenced_allocated;
  long i;

  if (e == 0)
    {
      return;
    }

  // Special case for forward declared interfaces in the
  // scope in which they're defined. Cannot add before full
  // definition is seen.
  if (e->node_type () == AST_Decl::NT_interface)
    {
      itf = AST_Interface::narrow_from_decl(e);

      if (itf != 0
          && itf->defined_in () == this
          && !itf->is_defined ())
        {
          return;
        }
    }

  // Only insert if it is not there already.
  if (this->referenced (e, id))
    {
      return;
    }

  // Make sure there's space for one more decl.
  if (this->pd_referenced_allocated == this->pd_referenced_used)
    {
      oreferenced_allocated = this->pd_referenced_allocated;
      pd_referenced_allocated += INCREMENT;

      ACE_NEW (tmp,
               AST_Decl *[this->pd_referenced_allocated]);

      for (i = 0; i < oreferenced_allocated; i++)
        {
          tmp[i] = this->pd_referenced[i];
        }

      delete [] this->pd_referenced;

      this->pd_referenced = tmp;
    }

  // Insert new decl.
  this->pd_referenced[this->pd_referenced_used++] = e;

  // Insert new reference.
  if (ex == 0)
    {
      this->pd_referenced[this->pd_referenced_used++] = e;
    }
  else if (this->referenced (ex))
    {
      for (i = this->pd_referenced_used; i > 0; i--)
        {
          this->pd_referenced[i] = this->pd_referenced[i - 1];

          if (this->pd_referenced[i-1] == ex)
            {
              this->pd_referenced[i] = e;
              break;
            }
        }

      ++this->pd_referenced_used;
    }

  // Now, if recursive is specified and "this" is not a common ancestor
  // of the referencing scope and the scope of definition of "e" then
  // add "e" to the set of referenced nodes in the parent of "this".
  if (recursive && !(e->has_ancestor (ScopeAsDecl (this))))
    {
      s = e->defined_in ();

      if (s != 0)
        {
          s->add_to_referenced (e,
                                recursive,
                                id);
        }
    }

  // Add the identifier arg, if non-null, to the identifier list.
  if (id)
    {
      if (this->pd_name_referenced_allocated == this->pd_name_referenced_used)
        {
          long name_referenced_allocated = this->pd_name_referenced_allocated;
          pd_name_referenced_allocated += INCREMENT;

          Identifier **name_tmp = 0;
          ACE_NEW (name_tmp,
                   Identifier *[this->pd_name_referenced_allocated]);

          for (i = 0; i < name_referenced_allocated; i++)
            {
              name_tmp[i] = this->pd_name_referenced[i];
            }

          delete [] this->pd_name_referenced;

          this->pd_name_referenced = name_tmp;
        }

      // Insert new identifier.
      this->pd_name_referenced[this->pd_name_referenced_used++] = id;
    }
}

void
UTL_Scope::replace_referenced (AST_Decl *old_decl,
                               AST_Decl *new_decl)
{
  for (int i = 0; i < this->pd_referenced_used; i++)
    {
      if (this->pd_referenced[i] == old_decl)
        {
          this->pd_referenced[i] = new_decl;
          break;
        }
    }

}


void
UTL_Scope::replace_scope (AST_Decl *old_decl,
                          AST_Decl *new_decl)
{
  for (int i = 0; i < pd_decls_used; i++)
    {
      if (this->pd_decls[i] == old_decl)
        {
          this->pd_decls[i] = new_decl;
          break;
        }
    }

}


// Add a node to set of nodes declared in this scope.
void
UTL_Scope::add_to_scope (AST_Decl *e,
                         AST_Decl *ex)
{
  if (e == 0)
    {
      return;
    }

  AST_Decl **tmp = this->pd_decls;
  long i = this->pd_decls_used;

  Identifier *decl_name = e->local_name ();
  char *decl_string = decl_name->get_string ();

  Identifier *ref_name = 0;
  char *ref_string = 0;

  // First, make sure there's no clash between e, that was
  // just declared, and some other identifier referenced
  // in this scope.
  for (; i > 0; --i, ++tmp)
    {
      // A local declaration doesn't use a scoped name.
      ref_name = (*tmp)->local_name ();
      ref_string = ref_name->get_string ();

      // If the names compare exactly, it's a redefini8tion
      // error, unless they're both modules (which can be
      // reopened) or we have a belated definition of a
      // forward-declared interface.
      AST_Decl::NodeType new_nt = e->node_type ();
      AST_Decl::NodeType scope_elem_nt = (*tmp)->node_type ();

      if (decl_name->compare (ref_name) == I_TRUE
          && this->redef_clash (new_nt, scope_elem_nt) == I_TRUE)
        {
          idl_global->err ()->redef_error (decl_string,
                                           ref_string);

          return;
        }
      // If the spellings differ only by case, it's also an error,
      // unless one, but not both of the identifiers were escaped.
      else if (decl_name->case_compare_quiet (ref_name) == I_TRUE
               && !(decl_name->escaped () ^ ref_name->escaped ()))
        {
          if (idl_global->case_diff_error ())
            {
              idl_global->err ()->name_case_error (decl_string,
                                                   ref_string);

              return;
            }
          else
            {
              idl_global->err ()->name_case_warning (decl_string,
                                                     ref_string);
            }
        }
    }

  AST_Decl *d = ScopeAsDecl (this);
  AST_Decl::NodeType nt = d->node_type ();

  // The name of any scope except the unnamed scope formed by an operation
  // may not be redefined immediately within (and the root scope has no name).
  // As well as OBV factory construct.
  if (nt != AST_Decl::NT_root
      && nt != AST_Decl::NT_op
      && nt != AST_Decl::NT_factory)
    {
      Identifier *parent_name = d->local_name ();

      if (decl_name->compare (parent_name) == I_TRUE)
        {
          idl_global->err ()->redef_error (
                                  decl_name->get_string (),
                                  parent_name->get_string ()
                                );
        }
      else if (decl_name->case_compare_quiet (parent_name) == I_TRUE)
        {
          if (idl_global->case_diff_error ())
            {
              idl_global->err ()->name_case_error (
                                      decl_name->get_string (),
                                      parent_name->get_string ()
                                    );
            }
          else
            {
              idl_global->err ()->name_case_warning (
                                      decl_name->get_string (),
                                      parent_name->get_string ()
                                    );
            }
        }
    }

  // Now make sure there's space for one more.
  if (this->pd_decls_allocated == this->pd_decls_used)
    {
      long odecls_allocated = this->pd_decls_allocated;
      this->pd_decls_allocated += INCREMENT;

      ACE_NEW (tmp,
               AST_Decl *[pd_decls_allocated]);

      for (i = 0; i < odecls_allocated; i++)
        {
          tmp[i] = this->pd_decls[i];
        }

      delete [] this->pd_decls;

      this->pd_decls = tmp;
    }


  // Insert new decl.
  if (ex == 0)
    {
      this->pd_decls[this->pd_decls_used++] = e;
    }
  else
    {
      for (i = this->pd_decls_used; i > 0; i--)
        {
          this->pd_decls[i] = this->pd_decls[i - 1];

          if (this->pd_decls[i - 1] == ex)
            {
              this->pd_decls[i] = e;
              break;
            }
        }

      ++this->pd_decls_used;
    }
}

// Add a node to set of nodes representing manifest
// types defined in this scope.
void
UTL_Scope::add_to_local_types (AST_Decl *e)
{
  if (e == 0)
    {
      return;
    }

  // Make sure there's space for one more.
  if (this->pd_locals_allocated == this->pd_locals_used)
    {
      long olocals_allocated = pd_locals_allocated;
      pd_locals_allocated += INCREMENT;

      AST_Decl **tmp = 0;
      ACE_NEW (tmp,
               AST_Decl *[this->pd_locals_allocated]);

      for (long i = 0; i < olocals_allocated; i++)
        {
          tmp[i] = this->pd_local_types[i];
        }

      delete [] this->pd_local_types;

      this->pd_local_types = tmp;
    }

  // Insert new decl.
  this->pd_local_types[this->pd_locals_used++] = e;
}

// Has this node been referenced here before?
idl_bool
UTL_Scope::referenced (AST_Decl *e,
                       Identifier *id)
{
  long i = pd_referenced_used;
  AST_Decl **tmp = pd_referenced;
  Identifier *member = 0;
  Identifier *test = 0;

  for (; i > 0; i--, tmp++)
    {
      // Same node?
      if (*tmp == e)
        {
          return I_TRUE;
        }

      // Are we definging a forward declared struct, union, or interface,
      // or reopening a module?
      idl_bool forward_redef = this->redef_clash (e->node_type (),
                                                  (*tmp)->node_type ());

      if (forward_redef == I_FALSE)
        {
          member = (*tmp)->local_name ();
          test = e->local_name ();

          if (member->compare (test) == I_TRUE)
            {
              return I_FALSE;
            }
        }
    }

  // pd_referenced is a list of decls, and so there's no
  // way of telling how much of its scoped name was used
  // when it was referenced in this scope. pd_name_referenced
  // is a list of Identifiers that store the identifier (or
  // the first segment of a scoped name) used in the reference,
  // so we can catch these name reolution clashes.
  if (id)
    {
      long j = pd_name_referenced_used;
      Identifier **name_tmp = pd_name_referenced;

      for (; j > 0; j--, name_tmp++)
        {
          // If we are a module, there is no clash, if we
          // are an interface, this is not the right place to
          // catch a clash, and if it wasn't defined in this
          // scope, then it's a type name for something else
          // that was, and it can appear any number of times
          // in this scope without a clash.
          if (id->compare (*name_tmp) == I_TRUE
              && e->node_type () != AST_Decl::NT_module
              && e->defined_in () == this)
            {
              idl_global->err ()->redef_error (id->get_string (),
                                               (*name_tmp)->get_string ());

              return I_TRUE;
            }
          // No clash if one or the other of the identifiers was escaped.
          else if (id->case_compare_quiet (*name_tmp) == I_TRUE
                   && !(id->escaped () ^ (*name_tmp)->escaped ()))
            {
              if (idl_global->case_diff_error ())
                {
                  idl_global->err ()->name_case_error (
                                          id->get_string (),
                                          (*name_tmp)->get_string ()
                                        );
                }
              else
                {
                  idl_global->err ()->name_case_warning (
                                          id->get_string (),
                                          (*name_tmp)->get_string ()
                                        );
                }

              return I_TRUE;
            }
        }
    }

  // Not found
  return I_FALSE;
}

idl_bool
UTL_Scope::has_prefix (void)
{
  return this->has_prefix_;
}

void
UTL_Scope::has_prefix (idl_bool val)
{
  this->has_prefix_ = val;
}

// Redefinition of inherited virtual operations.

// AST Dumping.
void
UTL_Scope::dump (ACE_OSTREAM_TYPE &o)
{
  AST_Decl *d = 0;

  if (idl_global->indent () == 0)
    {
      UTL_Indenter *idnt = 0;
      ACE_NEW (idnt,
               UTL_Indenter);

      idl_global->set_indent (idnt);
    }

  idl_global->indent ()->increase ();

  if (pd_locals_used > 0)
    {
      o << ("\n/* Locally defined types: */\n");

      for (UTL_ScopeActiveIterator i (this, UTL_Scope::IK_localtypes);
           !i.is_done ();
           i.next ())
        {
          d = i.item ();

          if (!d->imported ())
            {
              idl_global->indent ()->skip_to (o);
              d->dump (o);
              o << "\n";
            }
        }
    }

  if (pd_decls_used > 0)
    {
      o << ACE_TEXT ("\n/* Declarations: */\n");

      for (UTL_ScopeActiveIterator j (this, UTL_Scope::IK_decls);
           !j.is_done ();
           j.next ())
        {
          d = j.item ();

          if (!d->imported ())
            {
              idl_global->indent ()->skip_to (o);
              d->dump (o);
              o << ";\n";
            }
        }
    }

  idl_global->indent ()->decrease ();
}

int
UTL_Scope::ast_accept (ast_visitor *visitor)
{
  return visitor->visit_scope (this);
}

// How many entries are defined?
unsigned long
UTL_Scope::nmembers (void)
{
  return this->pd_decls_used;
}

void
UTL_Scope::destroy (void)
{
  for (UTL_ScopeActiveIterator iter (this, IK_both);
       !iter.is_done ();
       iter.next ())
    {
      AST_Decl *i = iter.item ();
      i->destroy ();
      delete i;
      i = 0;
    }

  delete [] this->pd_decls;
  this->pd_decls = 0;

  delete [] this->pd_local_types;
  this->pd_local_types = 0;

  delete [] this->pd_referenced;
  this->pd_referenced = 0;

  delete [] this->pd_name_referenced;
  this->pd_name_referenced = 0;
}

// Narrowing.
IMPL_NARROW_METHODS0(UTL_Scope)
IMPL_NARROW_FROM_SCOPE(UTL_Scope)

// UTL_SCOPE_ACTIVE_ITERATOR

// Constructor.
UTL_ScopeActiveIterator::UTL_ScopeActiveIterator (
    UTL_Scope *s,
    UTL_Scope::ScopeIterationKind i
  )
  : iter_source (s),
    ik (i),
    stage (i == UTL_Scope::IK_both ? UTL_Scope::IK_localtypes : i),
    il (0)
{
}

// Public operations.

// Advance to next item.
void
UTL_ScopeActiveIterator::next (void)
{
  this->il++;
}

// Get current item.
AST_Decl *
UTL_ScopeActiveIterator::item (void)
{
  if (this->is_done ())
    {
      return 0;
    }

  if (stage == UTL_Scope::IK_decls)
    {
      return this->iter_source->pd_decls[il];
    }

  if (stage == UTL_Scope::IK_localtypes)
    {
      return this->iter_source->pd_local_types[il];
    }

  return 0;
}

// Is this iteration done?
idl_bool
UTL_ScopeActiveIterator::is_done (void)
{
  long limit =
    (stage == UTL_Scope::IK_decls)
      ? iter_source->pd_decls_used
      : iter_source->pd_locals_used;

  for (;;)
    {
      // Last element?
      if (this->il < limit)
        {
          return I_FALSE;
        }

      // Only want decls?
      if (this->stage == UTL_Scope::IK_decls)
        {
          return I_TRUE;
        }

      // Already done local types?
      if (this->ik == UTL_Scope::IK_localtypes)
        {
          return I_TRUE;
        }

      // Switch to next stage.
      this->stage = UTL_Scope::IK_decls;
      this->il = 0;
      limit = this->iter_source->pd_decls_used;
    }
}

// What kind of iterator is this?
UTL_Scope::ScopeIterationKind
UTL_ScopeActiveIterator::iteration_kind (void)
{
  return this->ik;
}

// And where are we in the iteration?
UTL_Scope::ScopeIterationKind
UTL_ScopeActiveIterator::iteration_stage (void)
{
  return this->stage;
}
