92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/*
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* Copyright (c) 2002-2010 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 "functor.h"
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# include "netlist.h"
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# include <cassert>
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bool NetAssign::is_asynchronous()
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{
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return true;
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}
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bool NetCondit::is_asynchronous()
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{
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return false;
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}
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/*
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* NetEvWait statements come from statements of the form @(...) in the
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* Verilog source. These event waits are considered asynchronous if
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* all of the events in the list are ANYEDGE, and all the inputs to
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* the statement are included in the sensitivity list. If any of the
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* events are posedge or negedge, the statement is synchronous
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* (i.e. an edge-triggered flip-flop) and if any of the inputs are
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* unaccounted for in the sensitivity list then the statement is a
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* latch.
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*/
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bool NetEvWait::is_asynchronous()
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{
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/* The "sense" set contains the set of Nexa that are in the
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sensitivity list. We also require that the events are all
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level sensitive, but the nex_async_ method takes care of
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that test. */
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NexusSet*sense = new NexusSet;
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for (unsigned idx = 0 ; idx < nevents_ ; idx += 1) {
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NexusSet*tmp = event(idx)->nex_async_();
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if (tmp == 0) {
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delete sense;
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return false;
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}
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sense->add(*tmp);
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delete tmp;
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}
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NexusSet*inputs = statement_->nex_input();
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if (! sense->contains(*inputs)) {
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delete sense;
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delete inputs;
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return false;
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}
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delete sense;
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delete inputs;
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/* If it passes all the other tests, then this statement is
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asynchronous. */
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return true;
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}
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bool NetProc::is_asynchronous()
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{
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return false;
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}
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bool NetProcTop::is_asynchronous() const
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{
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if (type_ == IVL_PR_INITIAL)
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return false;
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return statement_->is_asynchronous();
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}
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