149 lines
4.3 KiB
C++
149 lines
4.3 KiB
C++
/*
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* Copyright (c) 2011 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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# include "vpi_config.h"
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# include "vpi_user.h"
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# include <cassert>
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/*
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* The $ivlh_attribute_event implements the VHDL <varname>'event
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* attribute. It does this by monitoring value-change events on the
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* operand, and noting the time. If the $ivlh_attribute_event is
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* called at the same simulation time as a value-change, then the
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* function returns logic true. Otherwise it returns false.
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*/
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struct monitor_data {
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struct t_vpi_time last_event;
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};
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/*
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* All the following are called from C so define them for C linkage.
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*/
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extern "C" {
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static PLI_INT32 monitor_events(struct t_cb_data*cb)
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{
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struct monitor_data*mon = reinterpret_cast<monitor_data*> (cb->user_data);
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assert(cb->time);
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assert(cb->time->type == vpiSimTime);
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mon->last_event = *(cb->time);
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return 0;
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}
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static PLI_INT32 ivlh_attribute_event_compiletf(ICARUS_VPI_CONST PLI_BYTE8*)
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{
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vpiHandle sys = vpi_handle(vpiSysTfCall, 0);
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vpiHandle argv = vpi_iterate(vpiArgument, sys);
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vpiHandle arg;
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// Check that there is at least 1 argument...
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if (argv == 0) {
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vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, sys), vpi_get(vpiLineNo, sys));
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vpi_printf("Call to %s missing its argument\n", vpi_get_str(vpiName,sys));
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vpi_control(vpiFinish, 1);
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return 0;
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}
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arg = vpi_scan(argv);
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assert(arg);
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struct monitor_data*monitor_handle = new struct monitor_data;
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struct t_cb_data cb;
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struct t_vpi_time tb;
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tb.type = vpiSimTime;
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cb.reason = cbValueChange;
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cb.cb_rtn = monitor_events;
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cb.obj = arg;
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cb.time = &tb;
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cb.value = 0;
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cb.user_data = reinterpret_cast<char*>(monitor_handle);
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vpi_register_cb(&cb);
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vpi_put_userdata(sys, monitor_handle);
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// check that there is no more then 1 argument
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arg = vpi_scan(argv);
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if (arg != 0) {
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vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, sys), vpi_get(vpiLineNo, sys));
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vpi_printf("Too many arguments for call to %s.\n", vpi_get_str(vpiName,sys));
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vpi_control(vpiFinish, 1);
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}
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return 0;
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}
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static PLI_INT32 ivlh_attribute_event_calltf(ICARUS_VPI_CONST PLI_BYTE8*)
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{
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vpiHandle sys = vpi_handle(vpiSysTfCall, 0);
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struct t_vpi_value rval;
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rval.format = vpiScalarVal;
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struct monitor_data*mon = reinterpret_cast<monitor_data*>(vpi_get_userdata(sys));
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if (mon->last_event.type == 0) {
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rval.value.scalar = vpi0;
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} else {
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struct t_vpi_time tnow;
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tnow.type = vpiSimTime;
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vpi_get_time(0,&tnow);
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rval.value.scalar = vpi1;
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if (mon->last_event.high != tnow.high)
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rval.value.scalar = vpi0;
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if (mon->last_event.low != tnow.low)
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rval.value.scalar = vpi0;
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}
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vpi_put_value(sys, &rval, 0, vpiNoDelay);
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return 0;
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}
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static PLI_INT32 ivlh_attribute_event_sizetf(ICARUS_VPI_CONST PLI_BYTE8*)
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{
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return 1;
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}
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static void vhdl_register(void)
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{
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s_vpi_systf_data tf_data;
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vpiHandle res;
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tf_data.type = vpiSysFunc;
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tf_data.sysfunctype = vpiSizedFunc;
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tf_data.calltf = ivlh_attribute_event_calltf;
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tf_data.compiletf = ivlh_attribute_event_compiletf;
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tf_data.sizetf = ivlh_attribute_event_sizetf;
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tf_data.tfname = "$ivlh_attribute_event";
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tf_data.user_data = (PLI_BYTE8 *) "$ivlh_attribute_event";
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res = vpi_register_systf(&tf_data);
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vpip_make_systf_system_defined(res);
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}
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void (*vlog_startup_routines[])() = {
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vhdl_register,
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0
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};
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} /* extern "C" */
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