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/*
* Copyright (c) 2002-2021 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include "config.h"
# include "netlist.h"
# include "compiler.h"
# include "PExpr.h"
# include <iostream>
using namespace std;
/*
* To make a NetUserFunc device, make as many pins as there are ports
* in the function. Get the port count from the function definition,
* which accounts for all the inputs, plus one for the phantom output
* that is the result.
*/
NetUserFunc::NetUserFunc(NetScope*s, perm_string n, NetScope*d,
NetEvWait*trigger__)
: NetNode(s, n, d->func_def()->port_count()+1),
def_(d), trigger_(trigger__)
{
pin(0).set_dir(Link::OUTPUT);
for (unsigned idx = 1 ; idx < pin_count() ; idx += 1) {
pin(idx).set_dir(Link::INPUT);
pin(idx).drive0(IVL_DR_HiZ);
pin(idx).drive1(IVL_DR_HiZ);
}
}
NetUserFunc::~NetUserFunc()
{
}
unsigned NetUserFunc::port_width(unsigned port) const
{
NetFuncDef*fdef = def_->func_def();
/* Port 0 is the return port. */
if (port == 0) {
const NetNet*sig = fdef->return_sig();
assert(sig);
return sig->vector_width();
}
port -= 1;
assert(port < fdef->port_count());
const NetNet*port_sig = fdef->port(port);
return port_sig->vector_width();
}
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_.size();
if ((parms_count == 1) && (parms_[0] == 0))
parms_count = 0;
if (dscope->type() != NetScope::FUNC) {
cerr << get_fileline() << ": error: Attempt to call scope "
<< scope_path(dscope) << " as a function." << endl;
des->errors += 1;
return false;
}
return true;
}
NetSysFunc::NetSysFunc(NetScope*s, perm_string n,
const struct sfunc_return_type*def,
unsigned ports, NetEvWait*trigger__)
: NetNode(s, n, ports), def_(def), trigger_(trigger__)
{
pin(0).set_dir(Link::OUTPUT); // Q
for (unsigned idx = 1 ; idx < pin_count() ; idx += 1) {
pin(idx).set_dir(Link::INPUT);
pin(idx).drive0(IVL_DR_HiZ);
pin(idx).drive1(IVL_DR_HiZ);
}
}
NetSysFunc::~NetSysFunc()
{
}
const char*NetSysFunc::func_name() const
{
return def_->name;
}
ivl_variable_type_t NetSysFunc::data_type() const
{
return def_->type;
}
unsigned NetSysFunc::vector_width() const
{
return def_->wid;
}
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