path: root/TAO/TAO_IDL/fe/fe_interface_header.cpp

// $Id$

/*

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Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
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This product is protected by copyright and distributed under the following
license restricting its use.

The Interface Definition Language Compiler Front End (CFE) is made
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notice on all media and documentation and the software program in which
this product is incorporated in whole or part. You may copy and extend
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Definition Language CFE without charge, but you are not authorized to
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Microsystems, Inc. ("Sun").

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distribution of Interface Definition Language CFE as permitted herein.

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with this license.  Upon termination, you shall destroy or return all code
and documentation for the Interface Definition Language CFE.

INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED AS IS WITH NO WARRANTIES OF
ANY KIND INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS
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INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED WITH NO SUPPORT AND WITHOUT
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 */

/*
 * fe_interface_header.cc - Implements the FE private class FE_InterfaceHeader
 *
 * FE_InterfaceHeader instances are used to store information about an
 * interface header as the interface is being parsed and before the
 * AST_Interface node used to represent this interface is created.
 */

#include	"idl.h"
#include	"idl_extern.h"

#include	"fe_private.h"

ACE_RCSID(fe, fe_interface_header, "$Id$")

/*
 * Constructor(s) and destructor
 */

FE_InterfaceHeader::FE_InterfaceHeader(UTL_ScopedName *n, UTL_NameList *nl)
		  : pd_interface_name(n)
{
  compile_inheritance(nl);
}

/*
 * Private operations
 */

// Compute flattened, non-repeating list of inherited interfaces

#undef	INCREMENT
#define	INCREMENT	512

/*
 * Private storage used to store interfaces seen already in the
 * computation of the unique, flattened inheritance list
 */
static AST_Interface **iseen = NULL;
static long	    iallocated = 0;
static long	    iused = 0;

/*
 * Add an interface to an inheritance spec
 */
static void
add_inheritance(AST_Interface *i)
{
  long			k;
  AST_Interface	      **oiseen;

  /*
   * Make sure there's space for one more
   */
  if (iallocated == iused) {
    if (iallocated == 0) {
      iallocated = INCREMENT;
      iseen = new AST_Interface *[iallocated];
    } else {
      oiseen = iseen;
      iallocated += INCREMENT;
      iseen = new AST_Interface *[iallocated];
      for (k = 0; k < iused; k++)
	iseen[k] = oiseen[k];
      delete oiseen;
    }
  }
  /*
   * OK, now insert it
   */
  iseen[iused] = i;
  iused++;
}

/*
 * Have we already seen this interface?
 */
static long
already_seen(AST_Interface *ip)
{
  long	i;

  for (i = 0; i < iused; i++) {
    if (iseen[i] == ip)
      return I_TRUE;
  }
  return I_FALSE;
}

/*
 * Add this interface to the list of inherited if not already there
 */
void
FE_InterfaceHeader::compile_one_inheritance(AST_Interface *i)
{
  /*
   * Check for badly formed interface
   */
  if (i == NULL)
    return;
  /*
   * If we've seen it already then don't expand again
   */
  if (already_seen(i))
    return;
  /*
   * OK, add i to the list of inherited interfaces
   */
  add_inheritance(i);
}

/*
 * Compute the list of top-level interfaces this one inherits from
 */
void
FE_InterfaceHeader::compile_inheritance(UTL_NameList *nl)
{
  UTL_NamelistActiveIterator *l = new UTL_NamelistActiveIterator(nl);
  AST_Decl		       *d;
  AST_Interface		       *i;
  long			        k;

  iused = 0;
  /*
   * Compute expanded flattened non-repeating list of interfaces
   * which this one inherits from
   */
  while (!(l->is_done())) {
    /*
     * Check that scope stack is valid
     */
    if (idl_global->scopes()->top() == NULL) {
      idl_global->err()->lookup_error(l->item());
      return;
    }
    /*
     * Look it up
     */
    d = idl_global->scopes()->top()->lookup_by_name(l->item(), I_TRUE);
    /*
     * Not found?
     */
    if (d == NULL) {
      idl_global->err()->lookup_error(l->item());
      return;
    }
    /*
     * Not an interface?
     */
    while(d->node_type() == AST_Decl::NT_typedef) 
      d = AST_Typedef::narrow_from_decl(d)->base_type();
    if (d->node_type() != AST_Decl::NT_interface) {
      idl_global->err()->inheritance_error(pd_interface_name, d);
      return;
    }
    /*
     * OK, cast to an interface
     */
    i = AST_Interface::narrow_from_decl(d);
    if (i == NULL)
       idl_global->err()->inheritance_error(pd_interface_name, d);
    /*
     * Forward declared interface?
     */
    if (!i->is_defined()) {
      idl_global->err()->inheritance_fwd_error(pd_interface_name, i);
      return;
    }
    /*
     * OK, see if we have to add this to the list of interfaces
     * inherited from
     */
    compile_one_inheritance(i);

    /*
     * Next element in header list
     */
    l->next();
  }
  delete l;
  /*
   * OK, install in interface header
   */
  pd_inherits = new AST_Interface *[iused];
  for (k = 0; k < iused; k++)
    pd_inherits[k] = iseen[k];
  pd_n_inherits = iused;
}

/*
 * Public operations
 */

/*
 * Redefinition of inherited virtual operations
 */

/*
 * Data accessors
 */

UTL_ScopedName *
FE_InterfaceHeader::interface_name()
{
  return pd_interface_name;
}

AST_Interface **
FE_InterfaceHeader::inherits()
{
  return pd_inherits;
}

long
FE_InterfaceHeader::n_inherits()
{
  return pd_n_inherits;
}