135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
/*
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* Copyright (c) 2000 Stephen Williams (steve@picturel.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: net_force.cc,v 1.4 2001/10/28 01:14:53 steve Exp $"
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#endif
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# include "config.h"
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/*
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* This file contains implementatsion of the NetForce, NetRelease,
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* NetCAssign and NetDeassign classes. These are similar or related in
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* that they handle the procedural continuous assign and force
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* statements.
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*/
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# include "netlist.h"
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# include <assert.h>
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/*
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* Construct the procedural continuous assignment statement. This is a
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* bit different from a normal assignment because the the lval is only
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* intermittantly connected. The deassign in particular disconnects
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* the signals when they are not being assigned anymore. Because of
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* this, there is no other reference to the lval to make it stay put
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* so we increment the eref.
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*
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* XXXX I'm not sure this is the right way. Perhaps I should create
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* output pins to connect to the netlist? But that would cause the
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* link ring to grow, and that is not quite correct either. Hmm...
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*/
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NetCAssign::NetCAssign(NetScope*s, const string&n, NetNet*l)
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: NetNode(s, n, l->pin_count()), lval_(l)
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{
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lval_->incr_eref();
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for (unsigned idx = 0 ; idx < pin_count() ; idx += 1) {
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pin(idx).set_dir(Link::INPUT);
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pin(idx).set_name("I", idx);
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}
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}
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NetCAssign::~NetCAssign()
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{
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lval_->decr_eref();
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}
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const Link& NetCAssign::lval_pin(unsigned idx) const
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{
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assert(idx < lval_->pin_count());
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return lval_->pin(idx);
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}
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NetDeassign::NetDeassign(NetNet*l)
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: lval_(l)
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{
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lval_->incr_eref();
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}
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NetDeassign::~NetDeassign()
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{
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lval_->decr_eref();
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}
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const NetNet*NetDeassign::lval() const
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{
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return lval_;
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}
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NetForce::NetForce(NetScope*s, const string&n, NetNet*l)
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: NetNode(s, n, l->pin_count()), lval_(l)
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{
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for (unsigned idx = 0 ; idx < pin_count() ; idx += 1) {
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pin(idx).set_dir(Link::INPUT);
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pin(idx).set_name("I", idx);
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}
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}
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NetForce::~NetForce()
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{
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}
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const Link& NetForce::lval_pin(unsigned idx) const
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{
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assert(idx < lval_->pin_count());
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return lval_->pin(idx);
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}
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NetRelease::NetRelease(NetNet*l)
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: lval_(l)
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{
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}
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NetRelease::~NetRelease()
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{
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}
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const NetNet*NetRelease::lval() const
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{
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return lval_;
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}
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/*
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* $Log: net_force.cc,v $
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* Revision 1.4 2001/10/28 01:14:53 steve
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* NetObj constructor finally requires a scope.
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*
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* Revision 1.3 2001/07/25 03:10:49 steve
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* Create a config.h.in file to hold all the config
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* junk, and support gcc 3.0. (Stephan Boettcher)
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*
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* Revision 1.2 2000/05/12 01:22:41 steve
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* NetCAssign needs to incr_eref its lval to lock it down.
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*
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* Revision 1.1 2000/05/11 23:37:27 steve
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* Add support for procedural continuous assignment.
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*
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*/
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