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net_func.cc
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net_func.cc
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/*
* 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_func.cc,v 1.2 2002/03/31 04:07:40 steve Exp $"
#endif
# include "config.h"
# include "netlist.h"
# include "PExpr.h"
# include <iostream>
static unsigned count_def_pins(const NetFuncDef*def)
{
unsigned sum = 0;
for (unsigned idx = 0 ; idx < def->port_count() ; idx += 1)
sum += def->port(idx)->pin_count();
return sum;
}
NetUserFunc::NetUserFunc(NetScope*s, const char*n, NetScope*d)
: NetNode(s, n, count_def_pins(d->func_def())), def_(d)
{
NetFuncDef*def = def_->func_def();
unsigned port_wid = port_width(0);
for (unsigned idx = 0 ; idx < port_wid ; idx += 1) {
pin(idx).set_dir(Link::OUTPUT);
pin(idx).set_name(def_->basename(), idx);
}
unsigned pin_base = port_wid;
for (unsigned idx = 1 ; idx < port_count() ; idx += 1) {
const NetNet*port_sig = def->port(idx);
unsigned bits = port_width(idx);
for (unsigned bit = 0; bit < bits; bit += 1) {
pin(pin_base+bit).set_dir(Link::INPUT);
pin(pin_base+bit).set_name(port_sig->name(), bit);
pin(pin_base+bit).drive0(Link::HIGHZ);
pin(pin_base+bit).drive1(Link::HIGHZ);
}
pin_base += bits;
}
}
NetUserFunc::~NetUserFunc()
{
}
unsigned NetUserFunc::port_count() const
{
return def_->func_def()->port_count();
}
unsigned NetUserFunc::port_width(unsigned port) const
{
NetFuncDef*def = def_->func_def();
assert(port < def->port_count());
const NetNet*port_sig = def->port(port);
return port_sig->pin_count();
}
Link& NetUserFunc::port_pin(unsigned port, unsigned idx)
{
NetFuncDef*def = def_->func_def();
unsigned pin_base = 0;
const NetNet*port_sig;
assert(port < def->port_count());
for (unsigned port_idx = 0 ; port_idx < port ; port_idx += 1) {
port_sig = def->port(port_idx);
pin_base += port_sig->pin_count();
}
port_sig = def->port(port);
assert(idx < port_sig->pin_count());
assert((pin_base+idx) < pin_count());
return pin(pin_base+idx);
}
const NetScope* NetUserFunc::def() const
{
return def_;
}
/*
* This method of the PECallFunction class checks that the parameters
* of the PECallFunction match the function definition. This is used
* during elaboration to validate the parameters before using them.
*/
bool PECallFunction::check_call_matches_definition_(Design*des, NetScope*dscope) const
{
assert(dscope);
/* How many parameters have I got? Normally the size of the
list is correct, but there is the special case of a list of
1 nil pointer. This is how the parser tells me of no
parameter. In other words, ``func()'' is 1 nil parameter. */
unsigned parms_count = parms_.count();
if ((parms_count == 1) && (parms_[0] == 0))
parms_count = 0;
if (dscope->type() != NetScope::FUNC) {
cerr << get_line() << ": error: Attempt to call scope "
<< dscope->name() << " as a function." << endl;
des->errors += 1;
return false;
}
if ((parms_count+1) != dscope->func_def()->port_count()) {
cerr << get_line() << ": error: Function " << dscope->name()
<< " expects " << (dscope->func_def()->port_count()-1)
<< " parameters, you passed " << parms_count << "."
<< endl;
des->errors += 1;
return false;
}
return true;
}
/*
* $Log: net_func.cc,v $
* Revision 1.2 2002/03/31 04:07:40 steve
* Update for gcc 3.0
*
* Revision 1.1 2002/03/09 02:10:22 steve
* Add the NetUserFunc netlist node.
*
*/