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#ifndef __netmisc_H
#define __netmisc_H
/*
* Copyright (c) 1999-2000 Stephen 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) && !defined(macintosh)
#ident "$Id: netmisc.h,v 1.10 2000/11/20 00:58:40 steve Exp $"
#endif

# include "netlist.h"

/*
* This funciton transforms an expression by padding the high bits
* with V0 until the expression has the desired width. This may mean
* not transforming the expression at all, if it is already wide
* enough.
*/
extern NetExpr*pad_to_width(NetExpr*expr, unsigned wid);
extern NetNet*pad_to_width(Design*des, const string&p, NetNet*n, unsigned w);

/*
* This local function returns true if all the the possible drivers of
* this link are constant. It will also return true if there are no
* drivers at all.
*/
extern bool link_drivers_constant(const Link&lnk);

/*
* This function returns the value of the constant driving this link,
* or Vz if there is no constant. The results of this function are
* only meaningful if link_drivers_constant(lnk) == true.
*/
extern verinum::V driven_value(const Link&lnk);

/*
* In some cases the lval is accessible as a pointer to the head of
* a list of NetAssign_ objects. This function returns the width of
* the l-value represented by this list.
*/
extern unsigned count_lval_width(const class NetAssign_*first);


/*
* $Log: netmisc.h,v $
* Revision 1.10 2000/11/20 00:58:40 steve
* Add support for supply nets (PR#17)
*
* Revision 1.9 2000/09/20 02:53:15 steve
* Correctly measure comples l-values of assignments.
*
* Revision 1.8 2000/06/25 19:59:42 steve
* Redesign Links to include the Nexus class that
* carries properties of the connected set of links.
*
* Revision 1.7 2000/05/14 17:55:04 steve
* Support initialization of FF Q value.
*
* Revision 1.6 2000/05/07 04:37:56 steve
* Carry strength values from Verilog source to the
* pform and netlist for gates.
*
* Change vvm constants to use the driver_t to drive
* a constant value. This works better if there are
* multiple drivers on a signal.
*
* Revision 1.5 2000/04/20 00:28:03 steve
* Catch some simple identity compareoptimizations.
*
* Revision 1.4 2000/03/16 19:03:03 steve
* Revise the VVM backend to use nexus objects so that
* drivers and resolution functions can be used, and
* the t-vvm module doesn't need to write a zillion
* output functions.
*
* Revision 1.3 2000/02/23 02:56:55 steve
* Macintosh compilers do not support ident.
*
* Revision 1.2 2000/02/16 03:58:27 steve
* Fix up width matching in structural bitwise operators.
*
* Revision 1.1 1999/09/29 00:42:51 steve
* Allow expanding of additive operators.
*
*/
#endif
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