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// Copyright (c) 2024, Marvin Borner <dev@marvinborner.de>
// SPDX-License-Identifier: MIT
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <target.h>
#include <parse.h>
#include <log.h>
static void write_bit(char val, FILE *file, char *byte, int *bit)
{
if (*bit > 7) { // flush byte
fwrite(byte, 1, 1, file);
*byte = 0;
*bit = 0;
}
// TODO: which endianness should be default?
if (val)
*byte |= 1UL << *bit;
/* *byte |= 1UL << (7 - *bit); */
(*bit)++;
}
static void fprint_unbblc(struct term *term, struct bloc_parsed *bloc,
FILE *file, char *byte, int *bit)
{
switch (term->type) {
case ABS:
write_bit(0, file, byte, bit);
write_bit(0, file, byte, bit);
fprint_unbblc(term->u.abs.term, bloc, file, byte, bit);
break;
case APP:
write_bit(0, file, byte, bit);
write_bit(1, file, byte, bit);
fprint_unbblc(term->u.app.lhs, bloc, file, byte, bit);
fprint_unbblc(term->u.app.rhs, bloc, file, byte, bit);
break;
case VAR:
for (int i = 0; i <= term->u.var.index; i++)
write_bit(1, file, byte, bit);
write_bit(0, file, byte, bit);
break;
case REF:
if (term->u.ref.index + 1 >= bloc->length)
fatal("invalid ref index %ld\n", term->u.ref.index);
fprint_unbblc(
bloc->entries[bloc->length - term->u.ref.index - 2],
bloc, file, byte, bit);
break;
default:
fatal("invalid type %d\n", term->type);
}
}
static void write_unbblc(struct bloc_parsed *bloc, FILE *file)
{
char byte = 0;
int bit = 0;
fprint_unbblc(bloc->entries[bloc->length - 1], bloc, file, &byte, &bit);
if (bit)
fwrite(&byte, 1, 1, file);
}
struct target_spec target_unbblc = {
.name = "unbblc",
.exec = write_unbblc,
};
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