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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
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: netmisc.h,v 1.19.2.1 2006/05/15 03:55:23 steve Exp $"
#endif

# include "netlist.h"

/*
* Search for a symbol using the "start" scope as the starting
* point. If the path includes a scope part, then locate the
* scope first.
*
* The return value is the scope where the symbol was found.
* If the symbol was not found, return 0. The output arguments
* get 0 except for the pointer to the object that represents
* the located symbol.
*/
extern NetScope* symbol_search(Design*des, NetScope*start, hname_t path,
NetNet*&net, /* net/reg */
NetMemory*&mem, /* memory */
NetVariable*&var, /* real/realtime */
const NetExpr*&par,/* parameter */
NetEvent*&eve /* named event */);

/*
* This function 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, NetNet*n, unsigned w);

/*
* This function takes as input a NetNet signal and adds a constant
* value to it. If the val is 0, then simply return sig. Otherwise,
* return a new NetNet value that is the output of an addition.
*/
extern NetNet*add_to_net(Design*des, NetNet*sig, long val);

/*
* Calculate the reduction OR from the input signal.
*/
extern NetNet*reduction_or(Design*des, NetNet*sig);

/*
* 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);

/*
* This function elaborates an expression, and tries to evaluate it
* right away. If the expression can be evaluated, this returns a
* constant expression. If it cannot be evaluated, it returns whatever
* it can. If the expression cannot be elaborated, return 0.
*/
class PExpr;
extern NetExpr* elab_and_eval(Design*des, NetScope*scope, const PExpr*pe);

/*
* $Log: netmisc.h,v $
* Revision 1.19.2.1 2006/05/15 03:55:23 steve
* Fix synthesis of expressions with land of vectors.
*
* Revision 1.19 2004/03/07 20:04:11 steve
* MOre thorough use of elab_and_eval function.
*
* Revision 1.18 2003/09/19 03:30:05 steve
* Fix name search in elab_lval.
*
* Revision 1.17 2003/01/30 16:23:08 steve
* Spelling fixes.
*
* Revision 1.16 2002/08/31 03:48:50 steve
* Fix reverse bit ordered bit select in continuous assignment.
*
* Revision 1.15 2002/08/12 01:35:00 steve
* conditional ident string using autoconfig.
*
* Revision 1.14 2002/06/25 01:33:22 steve
* Cache calculated driven value.
*
* Revision 1.13 2002/06/24 01:49:39 steve
* Make link_drive_constant cache its results in
* the Nexus, to improve cprop performance.
*
* Revision 1.12 2001/02/15 06:59:36 steve
* FreeBSD port has a maintainer now.
*
* Revision 1.11 2001/02/10 20:29:39 steve
* In the context of range declarations, use elab_and_eval instead
* of the less robust eval_const methods.
*
* 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.
*/
#endif
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