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https://github.com/steveicarus/iverilog.git
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85c58d0a7a
Drive strengths and delays are often handled as a pair of drive values and a rise/fall/decay triple. Add small helper types to carry these groups and use them in the continuous assignment and gate/UDP elaboration paths. Use the same helper types when propagating drive and delay values through netlist links. Also add helpers for dumping the values in debug output. This keeps the behavior consistent and fixes one small bug where some of the debug dumps printed the pointer value for the delays, rather than the actual delay values. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
/*
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* Copyright (c) 2002-2026 Stephen Williams (steve@icarus.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include "config.h"
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# include "netlist.h"
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# include "compiler.h"
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# include "PExpr.h"
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# include <iostream>
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using namespace std;
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/*
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* To make a NetUserFunc device, make as many pins as there are ports
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* in the function. Get the port count from the function definition,
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* which accounts for all the inputs, plus one for the phantom output
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* that is the result.
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*/
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NetUserFunc::NetUserFunc(NetScope*s, perm_string n, NetScope*d,
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NetEvWait*trigger__)
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: NetNode(s, n, d->func_def()->port_count()+1),
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def_(d), trigger_(trigger__)
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{
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pin(0).set_dir(Link::OUTPUT);
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for (unsigned idx = 1 ; idx < pin_count() ; idx += 1) {
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pin(idx).set_dir(Link::INPUT);
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pin(idx).drive(drive_strength_t::hiz);
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}
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}
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NetUserFunc::~NetUserFunc()
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{
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}
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unsigned NetUserFunc::port_width(unsigned port) const
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{
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const NetFuncDef*fdef = def_->func_def();
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/* Port 0 is the return port. */
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if (port == 0) {
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const NetNet*sig = fdef->return_sig();
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assert(sig);
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return sig->vector_width();
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}
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port -= 1;
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assert(port < fdef->port_count());
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const NetNet*port_sig = fdef->port(port);
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return port_sig->vector_width();
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}
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const NetScope* NetUserFunc::def() const
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{
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return def_;
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}
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/*
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* This method of the PECallFunction class checks that the parameters
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* of the PECallFunction match the function definition. This is used
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* during elaboration to validate the parameters before using them.
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*/
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bool PECallFunction::check_call_matches_definition_(Design*des, NetScope*dscope) const
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{
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assert(dscope);
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if (dscope->type() != NetScope::FUNC) {
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cerr << get_fileline() << ": error: Attempt to call scope "
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<< scope_path(dscope) << " as a function." << endl;
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des->errors += 1;
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return false;
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}
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return true;
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}
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NetSysFunc::NetSysFunc(NetScope*s, perm_string n,
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const struct sfunc_return_type*def,
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unsigned ports, NetEvWait*trigger__)
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: NetNode(s, n, ports), def_(def), trigger_(trigger__)
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{
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pin(0).set_dir(Link::OUTPUT); // Q
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for (unsigned idx = 1 ; idx < pin_count() ; idx += 1) {
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pin(idx).set_dir(Link::INPUT);
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pin(idx).drive(drive_strength_t::hiz);
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}
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}
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NetSysFunc::~NetSysFunc()
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{
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}
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const char*NetSysFunc::func_name() const
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{
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return def_->name;
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}
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ivl_variable_type_t NetSysFunc::data_type() const
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{
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return def_->type;
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}
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unsigned NetSysFunc::vector_width() const
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{
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return def_->wid;
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}
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