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/*
* Copyright (C) 2018-2021 Cary R. (cygcary@yahoo.com)
*
* This program is free software; you can redistribute it and/or modify
* it 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 <assert.h>
#include "vpi_user.h"
#include "sys_priv.h"
/*
* Check that $couintbits() is called with the correct arguments.
*/
static PLI_INT32 countbits_compiletf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
vpiHandle argv, arg;
int cb_count = 1;
assert(callh != 0);
argv = vpi_iterate(vpiArgument, callh);
(void)name; /* Parameter is not used. */
/* $countbits() must have arguments. */
if (argv == 0) {
vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, callh),
(int)vpi_get(vpiLineNo, callh));
vpi_printf("$countbits() requires at least two arguments.\n");
vpip_set_return_value(1);
vpi_control(vpiFinish, 1);
return 0;
}
/* The 1st argument must be numeric. */
arg = vpi_scan(argv);
if (! is_numeric_obj(arg)) {
vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, callh),
(int)vpi_get(vpiLineNo, callh));
vpi_printf("The first argument to $countbits() must be numeric.\n");
vpip_set_return_value(1);
vpi_control(vpiFinish, 1);
}
/* We need one or more numeric control bit arguments. */
arg = vpi_scan(argv);
if (! arg) {
vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, callh),
(int)vpi_get(vpiLineNo, callh));
vpi_printf("$countbits() requires at least one control bit "
"argument.\n");
vpip_set_return_value(1);
vpi_control(vpiFinish, 1);
}
do {
if (arg && ! is_numeric_obj(arg)) {
vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, callh),
(int)vpi_get(vpiLineNo, callh));
vpi_printf("Control bit argument %d to $countbits() must "
"be numeric.\n", cb_count);
vpip_set_return_value(1);
vpi_control(vpiFinish, 1);
}
++cb_count;
if (arg) arg = vpi_scan(argv);
} while (arg);
return 0;
}
/* Count the number of bits in the expression that match the search bits. */
static PLI_INT32 count_bits_in_expr(vpiHandle expr_arg, char search[4])
{
s_vpi_value val;
PLI_INT32 result;
PLI_INT32 size = vpi_get(vpiSize, expr_arg);
assert(size > 0);
val.format = vpiVectorVal;
vpi_get_value(expr_arg, &val);
result = 0;
for (unsigned lp = 0; lp < (unsigned)size; ++lp) {
unsigned offset = lp / 32;
unsigned bit = lp % 32;
unsigned abit, bbit;
abit = (val.value.vector[offset].aval >> bit) & 0x1;
bbit = (val.value.vector[offset].bval >> bit) & 0x1;
if (search[(bbit<<1)|abit]) ++result;
}
return result;
}
static PLI_INT32 countbits_calltf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
vpiHandle argv = vpi_iterate(vpiArgument, callh);
vpiHandle expr_arg = vpi_scan(argv);
vpiHandle arg;
char search[4];
(void)name; /* Parameter is not used. */
/* Scan the control bit arguments and mark which control bits to
* include in the count. */
for (unsigned lp = 0; lp < 4 ; ++lp) search[lp] = 0;
while ((arg = vpi_scan(argv))) {
s_vpi_value val;
val.format = vpiScalarVal;
vpi_get_value(arg, &val);
switch (val.value.scalar) {
case vpi0:
search[0] = 1;
break;
case vpi1:
search[1] = 1;
break;
case vpiZ:
search[2] = 1;
break;
case vpiX:
search[3] = 1;
break;
default:
vpi_printf("WARNING: %s:%d: ", vpi_get_str(vpiFile, callh),
(int)vpi_get(vpiLineNo, callh));
vpi_printf("Unknown scalar control bit argument %d passed "
"to $countbits() will be ignored.\n",
val.value.scalar);
break;
}
}
put_integer_value(callh, count_bits_in_expr(expr_arg, search));
return 0;
}
/* Count the number of ones in the expression. */
static PLI_INT32 count_ones_in_expr(vpiHandle expr_arg)
{
s_vpi_value val;
PLI_INT32 result;
PLI_INT32 size = vpi_get(vpiSize, expr_arg);
assert(size > 0);
val.format = vpiVectorVal;
vpi_get_value(expr_arg, &val);
result = 0;
size = (size + 31) / 32;
for (unsigned lp = 0; lp < (unsigned)size; ++lp) {
PLI_UINT32 ones = ~val.value.vector[lp].bval &
val.value.vector[lp].aval;
while (ones) {
if (ones & 0x1) ++result;
ones >>= 1;
}
}
return result;
}
static PLI_INT32 countones_calltf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
vpiHandle argv = vpi_iterate(vpiArgument, callh);
vpiHandle expr_arg = vpi_scan(argv);
(void)name; /* Parameter is not used. */
vpi_free_object(argv);
put_integer_value(callh, count_ones_in_expr(expr_arg));
return 0;
}
/* Check to see if the expression is onehot. */
static PLI_INT32 is_onehot(vpiHandle expr_arg, unsigned zero_is_okay)
{
s_vpi_value val;
unsigned found_a_one;
PLI_INT32 size = vpi_get(vpiSize, expr_arg);
assert(size > 0);
val.format = vpiVectorVal;
vpi_get_value(expr_arg, &val);
found_a_one = 0;
size = (size + 31) / 32;
for (unsigned lp = 0; lp < (unsigned)size; ++lp) {
PLI_UINT32 ones = ~val.value.vector[lp].bval &
val.value.vector[lp].aval;
while (ones) {
if (ones & 0x1) {
if (found_a_one) return vpi0;
found_a_one = 1;
}
ones >>= 1;
}
}
if (found_a_one) return vpi1;
else if (zero_is_okay) return vpi1;
return vpi0;
}
static PLI_INT32 onehot_calltf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
vpiHandle argv = vpi_iterate(vpiArgument, callh);
vpiHandle expr_arg = vpi_scan(argv);
(void)name; /* Parameter is not used. */
vpi_free_object(argv);
put_scalar_value(callh, is_onehot(expr_arg, 0));
return 0;
}
static PLI_INT32 onehot0_calltf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
vpiHandle argv = vpi_iterate(vpiArgument, callh);
vpiHandle expr_arg = vpi_scan(argv);
(void)name; /* Parameter is not used. */
vpi_free_object(argv);
put_scalar_value(callh, is_onehot(expr_arg, 1));
return 0;
}
/* Check to see if the expression has an undefined value. */
static PLI_INT32 is_unknown(vpiHandle expr_arg)
{
s_vpi_value val;
PLI_INT32 size = vpi_get(vpiSize, expr_arg);
assert(size > 0);
val.format = vpiVectorVal;
vpi_get_value(expr_arg, &val);
size = (size + 31) / 32;
for (unsigned lp = 0; lp < (unsigned)size; ++lp) {
if (val.value.vector[lp].bval) return vpi1;
}
return vpi0;
}
static PLI_INT32 isunknown_calltf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
vpiHandle argv = vpi_iterate(vpiArgument, callh);
vpiHandle expr_arg = vpi_scan(argv);
(void)name; /* Parameter is not used. */
vpi_free_object(argv);
put_scalar_value(callh, is_unknown(expr_arg));
return 0;
}
static PLI_INT32 bit_vec_sizetf(ICARUS_VPI_CONST PLI_BYTE8 *name)
{
(void)name; /* Parameter is not used. */
return 1;
}
/*
* Register the functions with Verilog.
*/
void v2009_bitvec_register(void)
{
s_vpi_systf_data tf_data;
vpiHandle res;
tf_data.type = vpiSysFunc;
tf_data.sysfunctype = vpiIntFunc;
tf_data.calltf = countbits_calltf;
tf_data.compiletf = countbits_compiletf;
tf_data.sizetf = 0;
tf_data.tfname = "$countbits";
tf_data.user_data = 0;
res = vpi_register_systf(&tf_data);
vpip_make_systf_system_defined(res);
tf_data.type = vpiSysFunc;
tf_data.sysfunctype = vpiIntFunc;
tf_data.calltf = countones_calltf;
tf_data.compiletf = sys_one_numeric_arg_compiletf;
tf_data.sizetf = 0;
tf_data.tfname = "$countones";
tf_data.user_data = "$countones";
res = vpi_register_systf(&tf_data);
vpip_make_systf_system_defined(res);
tf_data.type = vpiSysFunc;
tf_data.sysfunctype = vpiSizedFunc;
tf_data.calltf = onehot_calltf;
tf_data.compiletf = sys_one_numeric_arg_compiletf;
tf_data.sizetf = bit_vec_sizetf;
tf_data.tfname = "$onehot";
tf_data.user_data = "$onehot";
res = vpi_register_systf(&tf_data);
vpip_make_systf_system_defined(res);
tf_data.type = vpiSysFunc;
tf_data.sysfunctype = vpiSizedFunc;
tf_data.calltf = onehot0_calltf;
tf_data.compiletf = sys_one_numeric_arg_compiletf;
tf_data.sizetf = bit_vec_sizetf;
tf_data.tfname = "$onehot0";
tf_data.user_data = "$onehot0";
res = vpi_register_systf(&tf_data);
vpip_make_systf_system_defined(res);
tf_data.type = vpiSysFunc;
tf_data.sysfunctype = vpiSizedFunc;
tf_data.calltf = isunknown_calltf;
tf_data.compiletf = sys_one_numeric_arg_compiletf;
tf_data.sizetf = bit_vec_sizetf;
tf_data.tfname = "$isunknown";
tf_data.user_data = "$isunknown";
res = vpi_register_systf(&tf_data);
vpip_make_systf_system_defined(res);
}
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