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/* Copyright (C) 2025 Aryadev Chavali
* 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 Unlicense for details.
* You may distribute and modify this code under the terms of the Unlicense,
* which you should have received a copy of along with this program. If not,
* please go to <https://unlicense.org/>.
* Created: 2025-08-20
* Description: System management
*/
#include "./alisp.h"
#include <assert.h>
#include <malloc.h>
#include <string.h>
void sys_init(sys_t *sys)
{
sys->memory = NIL;
sym_table_init(&sys->symtable);
}
void sys_register(sys_t *sys, lisp_t *ptr)
{
// Generate an unmanaged cons
cons_t *cons = calloc(1, sizeof(*cons));
cons->car = ptr;
cons->cdr = sys->memory;
sys->memory = tag_cons(cons);
}
void sys_cleanup(sys_t *sys)
{
static_assert(NUM_TAGS == 5);
sym_table_cleanup(&sys->symtable);
if (!sys->memory)
return;
// Iterate through each element of memory
for (lisp_t *cell = sys->memory, *next = CDR(cell); cell;
cell = next, next = CDR(cell))
{
// Only reason allocated exists is because we had to allocate memory on the
// heap for it. It's therefore
lisp_t *allocated = CAR(cell);
switch (get_tag(allocated))
{
case TAG_CONS:
// Delete the cons
free(as_cons(allocated));
break;
case TAG_VEC:
{
lvec_t *lvec = as_vec(allocated);
vec_free(&lvec->data);
free(lvec);
break;
}
case TAG_NIL:
case TAG_INT:
case TAG_SYM:
case NUM_TAGS:
// shouldn't be dealt with (either constant or dealt with elsewhere)
break;
}
// Then free the current cell
free(as_cons(cell));
}
memset(sys, 0, sizeof(*sys));
}
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