// ast_interface_fwd.cpp,v 1.24 2006/06/15 18:56:09 parsons Exp

/*

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*/

// AST_InterfaceFwd nodes denote forward declarations of IDL interfaces.
// AST_InterfaceFwd nodes have a field containing the full declaration
// of the interface, which is initialized when that declaration is
// encountered.

#include "ast_interface_fwd.h"
#include "ast_interface.h"
#include "ast_module.h"
#include "ast_visitor.h"
#include "utl_identifier.h"

ACE_RCSID( ast,
           ast_interface_fwd,
           "ast_interface_fwd.cpp,v 1.24 2006/06/15 18:56:09 parsons Exp")

AST_InterfaceFwd::AST_InterfaceFwd (void)
  : COMMON_Base (),
    AST_Decl (),
    AST_Type (),
    pd_full_definition (0),
    is_defined_ (false)
{
}

AST_InterfaceFwd::AST_InterfaceFwd (AST_Interface *dummy,
                                    UTL_ScopedName *n)
  : COMMON_Base (dummy->is_local (),
                 dummy->is_abstract ()),
    AST_Decl (AST_Decl::NT_interface_fwd,
              n),
    AST_Type (AST_Decl::NT_interface_fwd,
              n),
    is_defined_ (false)
{
  // Create a dummy placeholder for the forward declared interface. This
  // interface node is not yet defined (n_inherits < 0), so some operations
  // will fail.
  this->pd_full_definition = dummy;
}

AST_InterfaceFwd::~AST_InterfaceFwd (void)
{
}

// Private operations.

bool
AST_InterfaceFwd::is_local (void)
{
  return this->full_definition ()->is_local ();
}

bool AST_InterfaceFwd::is_valuetype (void)
{
  return this->full_definition ()->node_type () == AST_Decl::NT_valuetype;
}

bool
AST_InterfaceFwd::is_abstract_valuetype (void)
{
  return (this->full_definition ()->is_abstract ()
          && this->is_valuetype ());
}

bool
AST_InterfaceFwd::full_def_seen (void)
{
  UTL_Scope *s = this->defined_in ();
  AST_Interface *i = 0;
  
  // If a full definition is seen in a previous module opening
  // or anywhere in the current scope (before or after our
  // declaration, reture TRUE.
  
  if (AST_Decl::NT_module == s->scope_node_type ())
    {
      AST_Module *m = AST_Module::narrow_from_scope (s);
      AST_Decl *d = m->look_in_previous (this->local_name (), false);
      
      if (0 != d)
        {
          i = AST_Interface::narrow_from_decl (d);
          
          if (0 != i && i->is_defined ())
            {
              return true;
            }
        }
    }
  
  for (UTL_ScopeActiveIterator iter (s, UTL_Scope::IK_decls);
        !iter.is_done ();
        iter.next ())
    {
      i = AST_Interface::narrow_from_decl (iter.item ());
      
      if (0 != i && this->local_name ()->compare (i->local_name ()))
        {
          if (i->is_defined ())
            {
              return true;
            }
        }
    }
    
  return false;
}

// Redefinition of inherited virtual operations.

// Dump this AST_InterfaceFwd node to the ostream o.
void
AST_InterfaceFwd::dump (ACE_OSTREAM_TYPE &o)
{
  if (this->is_abstract ())
    {
      this->dump_i (o, "abstract ");
    }
  else if (this->is_local ())
    {
      this->dump_i (o, "local ");
    }

  this->dump_i (o, "interface ");

  this->local_name ()->dump (o);
}

int
AST_InterfaceFwd::ast_accept (ast_visitor *visitor)
{
  return visitor->visit_interface_fwd (this);
}

// Data accessors.

AST_Interface *
AST_InterfaceFwd::full_definition (void)
{
  return this->pd_full_definition;
}

void
AST_InterfaceFwd::set_full_definition (AST_Interface *nfd)
{
  delete this->pd_full_definition;
  this->pd_full_definition = 0;
  this->pd_full_definition = nfd;
}

bool
AST_InterfaceFwd::is_defined (void)
{
  // Look for the one instance of the fwd decl
  // that may have a full definition.
  if (!this->is_defined_)
    {
      AST_Module *m =
        AST_Module::narrow_from_scope (this->defined_in ());
        
      if (0 != m)
        {
          AST_Decl *d = m->look_in_previous (this->local_name ());
          
          if (0 != d)
            {
              // We could be looking at a superfluous forward decl
              // of an interface already defined.
              AST_Interface *full = AST_Interface::narrow_from_decl (d);
              
              if (0 != full)
                {
                  this->is_defined_ = true;
                }
                
              AST_InterfaceFwd *fwd =
                AST_InterfaceFwd::narrow_from_decl (d);
                
              // Since fwd_redefinition_helper() is called
              // before fe_add_interface(), we can't check
              // n_inherits() or is_defined(), but added()
              // is a sufficient way to tell if our full
              // definition has already gone through the
              // add_to_scope process.  
              if (0 != fwd && fwd->full_definition ()->added ())
                {
                  this->is_defined_ = true;
                }
            }
        }
    }
    
  return this->is_defined_;
}

void
AST_InterfaceFwd::set_as_defined (void)
{
  this->is_defined_ = true;
}

void
AST_InterfaceFwd::destroy (void)
{
  // The implementation of is_defined() accomodates
  // code generation issues and doesn't have the
  // correct semantics here. The older implementation
  // of is_defined is used in the IF block below to
  // check if our full definition allocation must be
  // destroyed.
  if (!this->is_defined_)
    {
      // If our full definition is not defined, it
      // means that there was no full definition
      // for us in this compilation unit, so we 
      // have to destroy this allocation.
      this->pd_full_definition->destroy ();
      delete this->pd_full_definition;
      this->pd_full_definition = 0;
    }
    
  this->AST_Type::destroy ();
}

// Narrowing methods.
IMPL_NARROW_METHODS1 (AST_InterfaceFwd, AST_Type)
IMPL_NARROW_FROM_DECL (AST_InterfaceFwd)
