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/*
* Copyright (c) 1999Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: nodangle.cc,v 1.1 1999/11/18 03:52:20 steve Exp $"
#endif

/*
* This functor scans the design looking for dangling objects and
* excess local signals. These deletions are not necessarily required
* for proper functioning of anything, but they can clean up the
* appearance of design files that are generated.
*/
# include "functor.h"
# include "netlist.h"

class nodangle_f : public functor_t {
    public:
      void signal(Design*des, NetNet*sig);
};


void nodangle_f::signal(Design*des, NetNet*sig)
{
      if (! sig->local_flag())
return;

/* Check to see if there is some significant signal connected
to every pin of this signal. */
      unsigned significant_flags = 0;
      for (unsigned idx = 0 ; idx < sig->pin_count() ; idx += 1) {
NetObj::Link&lnk = sig->pin(idx);
for (NetObj::Link*cur = lnk.next_link()
; cur != &lnk ; cur = cur->next_link()) {
NetNet*cursig = dynamic_cast<NetNet*>(cur->get_obj());
if (cursig == 0)
continue;
if (cursig->local_flag())
continue;
significant_flags += 1;
break;
}
      }

/* If every pin is connected to another significant signal,
then I can delete this one. */
      if (significant_flags == sig->pin_count())
delete sig;
}

void nodangle(Design*des)
{
      nodangle_f fun;
      des->functor(&fun);
}

/*
* $Log: nodangle.cc,v $
* Revision 1.1 1999/11/18 03:52:20 steve
* Turn NetTmp objects into normal local NetNet objects,
* and add the nodangle functor to clean up the local
* symbols generated by elaboration and other steps.
*
*/

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