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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "blifparse.h"
#include "kernel/log.h"
#include <stdio.h>
#include <string.h>
static bool read_next_line(char *&buffer, size_t &buffer_size, int &line_count, FILE *f)
{
int buffer_len = 0;
buffer[0] = 0;
while (1)
{
buffer_len += strlen(buffer + buffer_len);
while (buffer_len > 0 && (buffer[buffer_len-1] == ' ' || buffer[buffer_len-1] == '\t' ||
buffer[buffer_len-1] == '\r' || buffer[buffer_len-1] == '\n'))
buffer[--buffer_len] = 0;
if (buffer_size-buffer_len < 4096) {
buffer_size *= 2;
buffer = (char*)realloc(buffer, buffer_size);
}
if (buffer_len == 0 || buffer[buffer_len-1] == '\\') {
if (buffer_len > 0 && buffer[buffer_len-1] == '\\')
buffer[--buffer_len] = 0;
line_count++;
if (fgets(buffer+buffer_len, buffer_size-buffer_len, f) == NULL)
return false;
} else
return true;
}
}
RTLIL::Design *abc_parse_blif(FILE *f, std::string dff_name)
{
RTLIL::Design *design = new RTLIL::Design;
RTLIL::Module *module = new RTLIL::Module;
RTLIL::Const *lutptr = NULL;
RTLIL::State lut_default_state = RTLIL::State::Sx;
int port_count = 0;
module->name = "\\netlist";
design->modules[module->name] = module;
size_t buffer_size = 4096;
char *buffer = (char*)malloc(buffer_size);
int line_count = 0;
while (1)
{
if (!read_next_line(buffer, buffer_size, line_count, f))
goto error;
continue_without_read:
if (buffer[0] == '#')
continue;
if (buffer[0] == '.')
{
if (lutptr) {
for (auto &bit : lutptr->bits)
if (bit == RTLIL::State::Sx)
bit = lut_default_state;
lutptr = NULL;
lut_default_state = RTLIL::State::Sx;
}
char *cmd = strtok(buffer, " \t\r\n");
if (!strcmp(cmd, ".model"))
continue;
if (!strcmp(cmd, ".end")) {
free(buffer);
return design;
}
if (!strcmp(cmd, ".inputs") || !strcmp(cmd, ".outputs")) {
char *p;
while ((p = strtok(NULL, " \t\r\n")) != NULL) {
RTLIL::Wire *wire = new RTLIL::Wire;
wire->name = stringf("\\%s", p);
wire->port_id = ++port_count;
if (!strcmp(cmd, ".inputs"))
wire->port_input = true;
else
wire->port_output = true;
module->add(wire);
}
continue;
}
if (!strcmp(cmd, ".latch"))
{
char *d = strtok(NULL, " \t\r\n");
char *q = strtok(NULL, " \t\r\n");
if (module->wires.count(RTLIL::escape_id(d)) == 0) {
RTLIL::Wire *wire = new RTLIL::Wire;
wire->name = RTLIL::escape_id(d);
module->add(wire);
}
if (module->wires.count(RTLIL::escape_id(q)) == 0) {
RTLIL::Wire *wire = new RTLIL::Wire;
wire->name = RTLIL::escape_id(q);
module->add(wire);
}
RTLIL::Cell *cell = new RTLIL::Cell;
cell->name = NEW_ID;
cell->type = dff_name;
cell->connections["\\D"] = module->wires.at(RTLIL::escape_id(d));
cell->connections["\\Q"] = module->wires.at(RTLIL::escape_id(q));
module->add(cell);
continue;
}
if (!strcmp(cmd, ".gate"))
{
RTLIL::Cell *cell = new RTLIL::Cell;
cell->name = NEW_ID;
module->add(cell);
char *p = strtok(NULL, " \t\r\n");
if (p == NULL)
goto error;
cell->type = RTLIL::escape_id(p);
while ((p = strtok(NULL, " \t\r\n")) != NULL) {
char *q = strchr(p, '=');
if (q == NULL || !q[0] || !q[1])
goto error;
*(q++) = 0;
if (module->wires.count(RTLIL::escape_id(q)) == 0) {
RTLIL::Wire *wire = new RTLIL::Wire;
wire->name = RTLIL::escape_id(q);
module->add(wire);
}
cell->connections[RTLIL::escape_id(p)] = module->wires.at(RTLIL::escape_id(q));
}
continue;
}
if (!strcmp(cmd, ".names"))
{
char *p;
RTLIL::SigSpec input_sig, output_sig;
while ((p = strtok(NULL, " \t\r\n")) != NULL) {
RTLIL::Wire *wire;
if (module->wires.count(stringf("\\%s", p)) > 0) {
wire = module->wires.at(stringf("\\%s", p));
} else {
wire = new RTLIL::Wire;
wire->name = stringf("\\%s", p);
module->add(wire);
}
input_sig.append(wire);
}
output_sig = input_sig.extract(input_sig.size()-1, 1);
input_sig = input_sig.extract(0, input_sig.size()-1);
if (input_sig.size() == 0) {
RTLIL::State state = RTLIL::State::Sa;
while (1) {
if (!read_next_line(buffer, buffer_size, line_count, f))
goto error;
for (int i = 0; buffer[i]; i++) {
if (buffer[i] == ' ' || buffer[i] == '\t')
continue;
if (i == 0 && buffer[i] == '.')
goto finished_parsing_constval;
if (buffer[i] == '0') {
if (state == RTLIL::State::S1)
goto error;
state = RTLIL::State::S0;
continue;
}
if (buffer[i] == '1') {
if (state == RTLIL::State::S0)
goto error;
state = RTLIL::State::S1;
continue;
}
goto error;
}
}
finished_parsing_constval:
if (state == RTLIL::State::Sa)
state = RTLIL::State::S1;
module->connections.push_back(RTLIL::SigSig(output_sig, state));
goto continue_without_read;
}
input_sig.optimize();
output_sig.optimize();
RTLIL::Cell *cell = new RTLIL::Cell;
cell->name = NEW_ID;
cell->type = "$lut";
cell->parameters["\\WIDTH"] = RTLIL::Const(input_sig.size());
cell->parameters["\\LUT"] = RTLIL::Const(RTLIL::State::Sx, 1 << input_sig.size());
cell->connections["\\I"] = input_sig;
cell->connections["\\O"] = output_sig;
lutptr = &cell->parameters.at("\\LUT");
lut_default_state = RTLIL::State::Sx;
module->add(cell);
continue;
}
goto error;
}
if (lutptr == NULL)
goto error;
char *input = strtok(buffer, " \t\r\n");
char *output = strtok(NULL, " \t\r\n");
if (input == NULL || output == NULL || (strcmp(output, "0") && strcmp(output, "1")))
goto error;
int input_len = strlen(input);
if (input_len > 8)
goto error;
for (int i = 0; i < (1 << input_len); i++) {
for (int j = 0; j < input_len; j++) {
char c1 = input[j];
if (c1 != '-') {
char c2 = (i & (1 << j)) != 0 ? '1' : '0';
if (c1 != c2)
goto try_next_value;
}
}
lutptr->bits.at(i) = !strcmp(output, "0") ? RTLIL::State::S0 : RTLIL::State::S1;
try_next_value:;
}
lut_default_state = !strcmp(output, "0") ? RTLIL::State::S1 : RTLIL::State::S0;
}
error:
log_error("Syntax error in line %d!\n", line_count);
// delete design;
// return NULL;
}
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