95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
#ifndef __netmisc_H
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#define __netmisc_H
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/*
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* Copyright (c) 1999-2000 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#if !defined(WINNT) && !defined(macintosh)
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#ident "$Id: netmisc.h,v 1.8 2000/06/25 19:59:42 steve Exp $"
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#endif
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# include "netlist.h"
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/*
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* This funciton transforms an expression by padding the high bits
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* with V0 until the expression has the desired width. This may mean
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* not transforming the expression at all, if it is already wide
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* enough.
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*/
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extern NetExpr*pad_to_width(NetExpr*expr, unsigned wid);
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extern NetNet*pad_to_width(Design*des, const string&p, NetNet*n, unsigned w);
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/*
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* Check to see if the link has a constant value driven to it. If
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* there is only a NetConst driving this pin, the return a pointer to
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* that NetConst object. Also, return the index of the bit in that
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* constant through the idx parameter.
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*/
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extern NetConst* link_const_value(Link&pin, unsigned&idx);
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/*
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* This local function returns true if all the the possible drivers of
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* this link are constant. It will also return true if there are no
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* drivers at all.
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*/
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extern bool link_drivers_constant(const Link&lnk);
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/*
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* This function returns the value of the constant driving this link,
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* or Vz if there is no constant. The results of this function are
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* only meaningful if link_drivers_constant(lnk) == true.
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*/
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extern verinum::V driven_value(const Link&lnk);
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/*
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* $Log: netmisc.h,v $
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* Revision 1.8 2000/06/25 19:59:42 steve
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* Redesign Links to include the Nexus class that
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* carries properties of the connected set of links.
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*
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* Revision 1.7 2000/05/14 17:55:04 steve
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* Support initialization of FF Q value.
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*
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* Revision 1.6 2000/05/07 04:37:56 steve
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* Carry strength values from Verilog source to the
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* pform and netlist for gates.
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*
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* Change vvm constants to use the driver_t to drive
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* a constant value. This works better if there are
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* multiple drivers on a signal.
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*
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* Revision 1.5 2000/04/20 00:28:03 steve
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* Catch some simple identity compareoptimizations.
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*
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* Revision 1.4 2000/03/16 19:03:03 steve
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* Revise the VVM backend to use nexus objects so that
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* drivers and resolution functions can be used, and
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* the t-vvm module doesn't need to write a zillion
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* output functions.
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*
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* Revision 1.3 2000/02/23 02:56:55 steve
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* Macintosh compilers do not support ident.
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*
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* Revision 1.2 2000/02/16 03:58:27 steve
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* Fix up width matching in structural bitwise operators.
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*
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* Revision 1.1 1999/09/29 00:42:51 steve
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* Allow expanding of additive operators.
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*
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*/
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#endif
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