Aryadev Chavali
0f68afd9a0
If it isn't a CONS, we return NIL instead of failing. This way, we can use it in our general iteration functions. Eventually the actual runtime would use this as well. The macros are mostly for internal use to do assignment etc.
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* Copyright (C) 2025 Aryadev Chavali
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the Unlicense for details.
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* You may distribute and modify this code under the terms of the Unlicense,
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* which you should have received a copy of along with this program. If not,
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* please go to <https://unlicense.org/>.
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* Created: 2025-08-20
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* Description: System management
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*/
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#include "./alisp.h"
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#include <assert.h>
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#include <malloc.h>
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#include <string.h>
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void sys_init(sys_t *sys)
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{
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sys->memory = NIL;
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sym_table_init(&sys->symtable);
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}
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void sys_register(sys_t *sys, lisp_t *ptr)
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{
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// Generate an unmanaged cons
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cons_t *cons = calloc(1, sizeof(*cons));
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cons->car = ptr;
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cons->cdr = sys->memory;
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sys->memory = tag_cons(cons);
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}
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void sys_cleanup(sys_t *sys)
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{
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static_assert(NUM_TAGS == 5);
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sym_table_cleanup(&sys->symtable);
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if (!sys->memory)
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return;
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// Iterate through each element of memory
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for (lisp_t *cell = sys->memory, *next = cdr(cell); cell;
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cell = next, next = cdr(next))
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{
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// Only reason allocated exists is because we had to allocate memory on the
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// heap for it. It's therefore enough to deal with only the allocated
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// types.
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lisp_t *allocated = car(cell);
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switch (get_tag(allocated))
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{
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case TAG_CONS:
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// Delete the cons
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free(as_cons(allocated));
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break;
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case TAG_VEC:
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{
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vec_t *vec = as_vec(allocated);
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vec_free(vec);
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free(vec);
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break;
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}
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case TAG_NIL:
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case TAG_INT:
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case TAG_SYM:
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case NUM_TAGS:
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// shouldn't be dealt with (either constant or dealt with elsewhere)
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break;
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}
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// Then free the current cell
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free(as_cons(cell));
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}
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memset(sys, 0, sizeof(*sys));
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}
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