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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_value read_bool(FILE *stream, t_value *mask) {
t_value r = 0;
t_value pow = 1;
char c;
if (mask != NULL) *mask = 0;
for(;;) {
fscanf(stream, "%c", &c);
if (c == '1') {
r |= pow;
} else if (c != '0') {
break;
}
if (mask != NULL) (*mask) |= pow;
pow *= 2;
}
return r;
}
void read_arg(FILE *stream, t_arg *dest) {
dest->mask = 0;
if (fscanf(stream, "$%d ", &(dest->SrcVar))) {
// ok, value is read
} else {
dest->Val = read_bool(stream, &dest->mask);
}
}
t_program *load_dumb_netlist (FILE *stream) {
int i, j;
// 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 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_ARG:
read_arg(stream, &(p->eqs[i].Arg.a));
break;
case C_REG:
fscanf(stream, "%d ", &(p->eqs[i].Reg.var));
break;
case C_NOT:
read_arg(stream, &(p->eqs[i].Not.a));
break;
case C_BINOP:
fscanf(stream, "%d ", &(p->eqs[i].Binop.op));
read_arg(stream, &(p->eqs[i].Binop.a));
read_arg(stream, &(p->eqs[i].Binop.b));
break;
case C_MUX:
read_arg(stream, &(p->eqs[i].Mux.a));
read_arg(stream, &(p->eqs[i].Mux.b));
read_arg(stream, &(p->eqs[i].Mux.c));
break;
case C_ROM:
fscanf(stream, "%d %d ", &(p->eqs[i].Rom.addr_size), &(p->eqs[i].Rom.word_size));
read_arg(stream, &(p->eqs[i].Rom.read_addr));
break;
case C_RAM:
fscanf(stream, "%d %d ", &(p->eqs[i].Ram.addr_size), &(p->eqs[i].Ram.word_size));
read_arg(stream, &(p->eqs[i].Ram.read_addr));
read_arg(stream, &(p->eqs[i].Ram.write_enable));
read_arg(stream, &(p->eqs[i].Ram.write_addr));
read_arg(stream, &(p->eqs[i].Ram.data));
break;
case C_CONCAT:
read_arg(stream, &(p->eqs[i].Mux.a));
read_arg(stream, &(p->eqs[i].Mux.b));
break;
case C_SLICE:
fscanf(stream, "%d %d ", &(p->eqs[i].Slice.begin), &(p->eqs[i].Slice.end));
read_arg(stream, &(p->eqs[i].Slice.source));
break;
case C_SELECT:
fscanf(stream, "%d ", &(p->eqs[i].Select.i));
read_arg(stream, &(p->eqs[i].Select.source));
break;
}
}
return p;
}
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