/* Copyright (c) 2024, Peter McGoron
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1) Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include "uns.h"
#include "cheney_c89.h"

static int silent = 0;

static void after_gc(Uns_GC gc, struct uns_cheney_c89_statistics *stats)
{
	if (!silent) {
		fprintf(stderr,
			"cheney_c89 %ld: %lu -> %lu\n",
		        stats->collection_number,
		        stats->usage_before,
		        stats->usage_after
		);
	}


	if (stats->usage_after >= stats->usage_before * 7/10) {
		uns_cheney_c89_set_new_heap_size(gc,
		    uns_cheney_c89_get_new_heap_size(gc) * 2);
	}
}


Uns_GC uns_lisp_gc_init(void)
{
	Uns_GC gc = malloc(uns_gc_size);
	const char *env;
	uns_gc_zero(gc);
	if (!uns_cheney_c89_init(gc, 512)) {
		fprintf(stderr, "Error initializing GC\n");
		exit(1);
	}

	env = getenv("UNS_LISP_SILENT");
	if (env && env[0] == 'y') {
		silent = 1;
	}

	uns_cheney_c89_set_collect_callback(gc, after_gc);
	uns_cheney_c89_set_new_heap_size(gc, 1024);

	return gc;
}