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/*
Système Digital
2013-2014
Alex AUVOLAT
load.c Code for loading dumbed-down netlist files
(no parsing of .net files !!)
*/
#include <stdlib.h>
#include "sim.h"
t_rom *roms = NULL;
void eat_comment(FILE *file) {
while (1) {
char c = fgetc(file);
if (isspace(c)) continue;
if (c == '#') {
while (fgetc(file) != '\n');
continue;
}
ungetc(c, file);
break;
}
}
void add_rom(const char *prefix, FILE *file) {
int i;
t_rom *rom = malloc(sizeof(t_rom));
rom->prefix = prefix;
// Load ROM file
eat_comment(file);
fscanf(file, "%d %d\n", &(rom->words_defined), &(rom->word_size));
rom->data = malloc(rom->words_defined * sizeof(t_value));
for (i = 0; i < rom->words_defined; i++) {
eat_comment(file);
if (fscanf(file, "/%lu", &(rom->data[i]))) {
// ok, value is read
} else if (fscanf(file, "x%x", &(rom->data[i]))) {
// ok, value is read
} else {
rom->data[i] = read_bool(file, NULL);
}
}
rom->next = roms;
roms = rom;
}
t_program *load_dumb_netlist (FILE *stream) {
int i, j, as, ws;
t_rom *r;
// let us suppose that the input to be read is well-formed.
t_program *p = malloc(sizeof(t_program));
// Read variable list, with sizes and identifiers
fscanf(stream, "%d ", &(p->n_vars));
p->vars = malloc(p->n_vars * sizeof(t_variable));
for (i = 0; i < p->n_vars; i++) {
fscanf(stream, "%d ", &(p->vars[i].size));
for(j = 0; j < p->vars[i].size; j++) {
p->vars[i].mask = (p->vars[i].mask << 1) | 1;
}
p->vars[i].name = malloc(42); // let's bet that the name of a variable will never be longer than 42 chars
fscanf(stream, "%s\n", p->vars[i].name);
if (p->vars[i].size >= 8*sizeof(t_value)) {
fprintf(stderr, "Warning: variable %s might be too big for machine integers.\n", p->vars[i].name);
}
}
// read input list
fscanf(stream, "%d ", &(p->n_inputs));
p->inputs = malloc(p->n_inputs * sizeof(t_id));
for (i = 0; i < p->n_inputs; i++) {
fscanf(stream, "%d ", &(p->inputs[i]));
}
// read output list
fscanf(stream, "%d ", &(p->n_outputs));
p->outputs = malloc(p->n_outputs * sizeof(t_id));
for (i = 0; i < p->n_outputs; i++) {
fscanf(stream, "%d ", &(p->outputs[i]));
}
// read register list
fscanf(stream, "%d", &(p->n_regs));
p->regs = malloc(p->n_regs * sizeof(t_reg));
for (i = 0; i < p->n_regs; i++) {
fscanf(stream, "%d %d\n", &(p->regs[i].dest), &(p->regs[i].source));
}
// read RAM list
fscanf(stream, "%d", &(p->n_rams));
p->rams = malloc(p->n_rams * sizeof(t_ram));
for (i = 0; i < p->n_rams; i++) {
fscanf(stream, "%d %d %d %d %d\n",
&(p->rams[i].addr_size),
&(p->rams[i].word_size),
&(p->rams[i].write_enable),
&(p->rams[i].write_addr), &(p->rams[i].data));
}
// read equation list
fscanf(stream, "%d ", &(p->n_eqs));
p->eqs = malloc(p->n_eqs * sizeof(t_equation));
for (i = 0; i < p->n_eqs; i++) {
fscanf(stream, "%d ", &(p->eqs[i].dest_var));
fscanf(stream, "%d ", &(p->eqs[i].type));
switch (p->eqs[i].type) {
case C_COPY:
fscanf(stream, "%d ", &(p->eqs[i].Copy.a));
break;
case C_NOT:
fscanf(stream, "%d ", &(p->eqs[i].Not.a));
break;
case C_BINOP:
fscanf(stream, "%d %d %d ",
&(p->eqs[i].Binop.op),
&(p->eqs[i].Binop.a),
&(p->eqs[i].Binop.b));
break;
case C_MUX:
fscanf(stream, "%d %d %d ",
&(p->eqs[i].Mux.a),
&(p->eqs[i].Mux.b),
&(p->eqs[i].Mux.c));
break;
case C_ROM:
fscanf(stream, "%d %d %d ",
&as, &ws,
&(p->eqs[i].Rom.read_addr));
p->eqs[i].Rom.rom = NULL;
// find corresponding ROM
for (r = roms; r != NULL; r = r->next) {
if (is_prefix(r->prefix, p->vars[p->eqs[i].dest_var].name)) {
if (r->word_size == ws) {
p->eqs[i].Rom.rom = r;
break;
} else {
fprintf(stderr,
"Error: ROM prefixed by '%s' does not have size corresponding to variable that uses it.\n",
r->prefix);
}
}
}
if (p->eqs[i].Rom.rom == NULL)
fprintf(stderr, "Warning: ROM variable '%s' has no ROM data.\n",
p->vars[p->eqs[i].dest_var].name);
break;
case C_CONCAT:
fscanf(stream, "%d %d ",
&(p->eqs[i].Concat.a),
&(p->eqs[i].Concat.b));
p->eqs[i].Concat.shift = p->vars[p->eqs[i].Concat.a].size;
break;
case C_SLICE:
fscanf(stream, "%d %d %d ",
&(p->eqs[i].Slice.begin),
&(p->eqs[i].Slice.end),
&(p->eqs[i].Slice.source));
break;
case C_SELECT:
fscanf(stream, "%d %d ",
&(p->eqs[i].Select.i),
&(p->eqs[i].Select.source));
break;
case C_READRAM:
fscanf(stream, "%d %d ",
&(p->eqs[i].ReadRAM.ram_id),
&(p->eqs[i].ReadRAM.source));
break;
}
}
return p;
}
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