Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: s20020714
Fetching contributors…

Cannot retrieve contributors at this time

file 169 lines (145 sloc) 4.052 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169
/*
* Copyright (c) 2002 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)
#ident "$Id: net_expr.cc,v 1.5 2002/06/06 18:57:18 steve Exp $"
#endif

# include "config.h"
# include "netlist.h"
# include <iostream>

NetEConcat::NetEConcat(unsigned cnt, NetExpr* r)
: parms_(cnt), repeat_(r)
{
      if (repeat_ == 0) {
repeat_calculated_ = true;
repeat_value_ = 1;
      } else {
repeat_calculated_ = false;
      }

      expr_width(0);
}

NetEConcat::~NetEConcat()
{
      for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1)
delete parms_[idx];
}

void NetEConcat::set(unsigned idx, NetExpr*e)
{
      assert(idx < parms_.count());
      assert(parms_[idx] == 0);
      parms_[idx] = e;
      expr_width( expr_width() + e->expr_width() );
}

NetEConcat* NetEConcat::dup_expr() const
{
      NetEConcat*dup = new NetEConcat(parms_.count(), repeat_);
      for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1)
if (parms_[idx]) {
NetExpr*tmp = parms_[idx]->dup_expr();
assert(tmp);
dup->parms_[idx] = tmp;
}


      dup->expr_width(expr_width());
      return dup;
}

unsigned NetEConcat::repeat()
{
      if (repeat_calculated_)
return repeat_value_;

      assert(repeat_);

      if (! dynamic_cast<NetEConst*>(repeat_)) {
NetExpr*tmp = repeat_->eval_tree();
if (tmp != 0) {
delete repeat_;
repeat_ = tmp;
}
      }

      NetEConst*repeat_const = dynamic_cast<NetEConst*>(repeat_);

/* This should not be possible, as it was checked earlier to
assure that this is a constant expression. */
      if (repeat_const == 0) {
cerr << get_line() << ": internal error: repeat expression "
<< "is not a compile time constant." << endl;
cerr << get_line() << ": : Expression is: "
<< *repeat_ << endl;
repeat_calculated_ = true;
repeat_value_ = 1;
return 1;
      }

      repeat_calculated_ = true;
      repeat_value_ = repeat_const->value().as_ulong();

      delete repeat_;
      repeat_ = 0;

      return repeat_value_;
}

unsigned NetEConcat::repeat() const
{
      assert(repeat_calculated_);
      return repeat_value_;
}

NetESelect::NetESelect(NetExpr*exp, NetExpr*base, unsigned wid)
: expr_(exp), base_(base)
{
      expr_width(wid);
}

NetESelect::~NetESelect()
{
      delete expr_;
      delete base_;
}

const NetExpr*NetESelect::sub_expr() const
{
      return expr_;
}

const NetExpr*NetESelect::select() const
{
      return base_;
}

bool NetESelect::has_width() const
{
      return true;
}

bool NetESelect::set_width(unsigned w)
{
      if (expr_width() == 1)
return true;
      else
return false;
}

/*
* $Log: net_expr.cc,v $
* Revision 1.5 2002/06/06 18:57:18 steve
* Use standard name for iostream.
*
* Revision 1.4 2002/05/25 16:51:37 steve
* include iostream for gcc 3.1
*
* Revision 1.3 2002/05/05 21:11:50 steve
* Put off evaluation of concatenation repeat expresions
* until after parameters are defined. This allows parms
* to be used in repeat expresions.
*
* Add the builtin $signed system function.
*
* Revision 1.2 2002/01/29 22:36:31 steve
* include config.h to eliminate warnings.
*
* Revision 1.1 2002/01/28 01:39:45 steve
* Add ne_expr.cc
*
*/
Something went wrong with that request. Please try again.