iverilog/net_assign.cc

/*
 * Copyright (c) 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: net_assign.cc,v 1.9 2002/04/21 22:31:02 steve Exp $"
#endif

# include "config.h"

# include  "netlist.h"

/*
 * NetAssign
 */

unsigned count_lval_width(const NetAssign_*idx)
{
      unsigned wid = 0;
      while (idx) {
	    wid += idx->lwidth();
	    idx = idx->more;
      }
      return wid;
}

NetAssign_::NetAssign_(NetNet*s)
: sig_(s), bmux_(0)
{
      loff_ = 0;
      lwid_ = sig_->pin_count();
      sig_->incr_eref();
      more = 0;
}

NetAssign_::~NetAssign_()
{
      if (sig_) sig_->decr_eref();
      assert( more == 0 );
      if (bmux_) delete bmux_;
}

void NetAssign_::set_bmux(NetExpr*r)
{
      assert(bmux_ == 0);
      bmux_ = r;
}

const NetExpr* NetAssign_::bmux() const
{
      return bmux_;
}

unsigned NetAssign_::lwidth() const
{
      if (bmux_) return 1;
      else return lwid_;
}

const char*NetAssign_::name() const
{
      if (sig_) {
	    return sig_->name();
      } else {
	    return "";
      }
}

NetNet* NetAssign_::sig() const
{
      assert(sig_);
      return sig_;
}

void NetAssign_::set_part(unsigned lo, unsigned lw)
{
      loff_ = lo;
      lwid_ = lw;
      assert(sig_->pin_count() >= (lo + lw));
}

unsigned NetAssign_::get_loff() const
{
      return loff_;
}

NetAssignBase::NetAssignBase(NetAssign_*lv, NetExpr*rv)
: lval_(lv), rval_(rv), delay_(0)
{
}

NetAssignBase::~NetAssignBase()
{
      if (rval_) delete rval_;
      while (lval_) {
	    NetAssign_*tmp = lval_;
	    lval_ = tmp->more;
	    tmp->more = 0;
	    delete tmp;
      }
}

NetExpr* NetAssignBase::rval()
{
      return rval_;
}

const NetExpr* NetAssignBase::rval() const
{
      return rval_;
}

void NetAssignBase::set_rval(NetExpr*r)
{
      if (rval_) delete rval_;
      rval_ = r;
}

NetAssign_* NetAssignBase::l_val(unsigned idx)
{
      NetAssign_*cur = lval_;
      while (idx > 0) {
	    if (cur == 0)
		  return cur;

	    cur = cur->more;
	    idx -= 1;
      }

      assert(idx == 0);
      return cur;
}

const NetAssign_* NetAssignBase::l_val(unsigned idx) const
{
      const NetAssign_*cur = lval_;
      while (idx > 0) {
	    if (cur == 0)
		  return cur;

	    cur = cur->more;
	    idx -= 1;
      }

      assert(idx == 0);
      return cur;
}

unsigned NetAssignBase::l_val_count() const
{
      const NetAssign_*cur = lval_;
      unsigned cnt = 0;
      while (cur) {
	    cnt += 1;
	    cur = cur->more;
      }

      return cnt;
}

unsigned NetAssignBase::lwidth() const
{
      unsigned sum = 0;
      for (NetAssign_*cur = lval_ ;  cur ;  cur = cur->more)
	    sum += cur->lwidth();
      return sum;
}

void NetAssignBase::set_delay(NetExpr*expr)
{
      delay_ = expr;
}

const NetExpr* NetAssignBase::get_delay() const
{
      return delay_;
}

NetAssign::NetAssign(NetAssign_*lv, NetExpr*rv)
: NetAssignBase(lv, rv)
{
}

NetAssign::~NetAssign()
{
}

NetAssignNB::NetAssignNB(NetAssign_*lv, NetExpr*rv)
: NetAssignBase(lv, rv)
{
}

NetAssignNB::~NetAssignNB()
{
}

/*
 * $Log: net_assign.cc,v $
 * Revision 1.9  2002/04/21 22:31:02  steve
 *  Redo handling of assignment internal delays.
 *  Leave it possible for them to be calculated
 *  at run time.
 *
 * Revision 1.8  2001/08/25 23:50:03  steve
 *  Change the NetAssign_ class to refer to the signal
 *  instead of link into the netlist. This is faster
 *  and uses less space. Make the NetAssignNB carry
 *  the delays instead of the NetAssign_ lval objects.
 *
 *  Change the vvp code generator to support multiple
 *  l-values, i.e. concatenations of part selects.
 *
 * Revision 1.7  2001/07/25 03:10:49  steve
 *  Create a config.h.in file to hold all the config
 *  junk, and support gcc 3.0. (Stephan Boettcher)
 *
 * Revision 1.6  2000/10/18 20:04:39  steve
 *  Add ivl_lval_t and support for assignment l-values.
 *
 * Revision 1.5  2000/09/20 02:53:15  steve
 *  Correctly measure comples l-values of assignments.
 *
 * Revision 1.4  2000/09/10 02:18:16  steve
 *  elaborate complex l-values
 *
 * Revision 1.3  2000/09/07 00:06:53  steve
 *  encapsulate access to the l-value expected width.
 *
 * Revision 1.2  2000/09/02 23:40:13  steve
 *  Pull NetAssign_ creation out of constructors.
 *
 * Revision 1.1  2000/09/02 20:54:20  steve
 *  Rearrange NetAssign to make NetAssign_ separate.
 *
 */