__code start_code();
__code meta_start_code();
__code exit_code();

__code start_code(Context* context, __code (*next)()) {
    goto meta_start_code(context, next);
}

__code meta_start_code(Context* context, __code (*next)()) {
    context->next = next;
    goto context->next(context);
}

__code exit_code(Context* context) {
    free(context->ds_heap);
    free(context->mds_heap);
    goto exit(0);
}