collections.c
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collections.c
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	#include <stdlib.h>
	#include <string.h>
	#include <stdio.h>

	#include "ant.h"
	#include "errors.h"
	#include "runtime.h"
	#include "internal.h"
	#include "arena.h"
	#include "gc.h"

	#include "modules/collections.h"
	#include "modules/symbol.h"

	static map_registry_entry_t *map_registry = NULL;
	static size_t map_registry_count = 0;
	static size_t map_registry_cap = 0;

	static set_registry_entry_t *set_registry = NULL;
	static size_t set_registry_count = 0;
	static size_t set_registry_cap = 0;

	static jsval_t iter_return_this(ant_t js, jsval_t args, int nargs) {
	return js->this_val;
	}

	static void register_map(map_entry_t **head, jsoff_t obj_offset) {
	if (!head) return;
	if (map_registry_count >= map_registry_cap) {
	size_t new_cap = map_registry_cap ? map_registry_cap * 2 : 64;
	map_registry_entry_t new_reg = realloc(map_registry, new_cap sizeof(map_registry_entry_t));
	if (!new_reg) return;
	map_registry = new_reg;
	map_registry_cap = new_cap;
	}
	map_registry[map_registry_count].head = head;
	map_registry[map_registry_count].obj_offset = obj_offset;
	map_registry_count++;
	}

	static void register_set(set_entry_t **head, jsoff_t obj_offset) {
	if (!head) return;
	if (set_registry_count >= set_registry_cap) {
	size_t new_cap = set_registry_cap ? set_registry_cap * 2 : 64;
	set_registry_entry_t new_reg = realloc(set_registry, new_cap sizeof(set_registry_entry_t));
	if (!new_reg) return;
	set_registry = new_reg;
	set_registry_cap = new_cap;
	}
	set_registry[set_registry_count].head = head;
	set_registry[set_registry_count].obj_offset = obj_offset;
	set_registry_count++;
	}

	static const char jsval_to_key(ant_t js, jsval_t val) {
	if (vtype(val) == T_STR) {
	jsoff_t len;
	jsoff_t off = vstr(js, val, &len);
	return (char *)js_mem_ptr(js, off);
	}
	return js_str(js, val);
	}

	map_entry_t *get_map_from_obj(ant_t js, jsval_t obj) {
	jsval_t map_val = js_get_slot(js, obj, SLOT_MAP);
	if (vtype(map_val) == T_UNDEF) return NULL;
	return (map_entry_t **)(uintptr_t)js_getnum(map_val);
	}

	set_entry_t *get_set_from_obj(ant_t js, jsval_t obj) {
	jsval_t set_val = js_get_slot(js, obj, SLOT_SET);
	if (vtype(set_val) == T_UNDEF) return NULL;
	return (set_entry_t **)(uintptr_t)js_getnum(set_val);
	}

	static weakmap_entry_t *get_weakmap_from_obj(ant_t js, jsval_t obj) {
	jsval_t wm_val = js_get_slot(js, obj, SLOT_DATA);
	if (vtype(wm_val) == T_UNDEF) return NULL;
	return (weakmap_entry_t **)(uintptr_t)js_getnum(wm_val);
	}

	static weakset_entry_t *get_weakset_from_obj(ant_t js, jsval_t obj) {
	jsval_t ws_val = js_get_slot(js, obj, SLOT_DATA);
	if (vtype(ws_val) == T_UNDEF) return NULL;
	return (weakset_entry_t **)(uintptr_t)js_getnum(ws_val);
	}

	static map_iterator_state_t get_map_iter_state(ant_t js, jsval_t obj) {
	jsval_t state_val = js_get_slot(js, obj, SLOT_ITER_STATE);
	if (vtype(state_val) == T_UNDEF) return NULL;
	return (map_iterator_state_t *)(uintptr_t)js_getnum(state_val);
	}

	static set_iterator_state_t get_set_iter_state(ant_t js, jsval_t obj) {
	jsval_t state_val = js_get_slot(js, obj, SLOT_ITER_STATE);
	if (vtype(state_val) == T_UNDEF) return NULL;
	return (set_iterator_state_t *)(uintptr_t)js_getnum(state_val);
	}

	static jsval_t map_set(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "Map.set() requires 2 arguments");

	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);
	if (!map_ptr) return js_mkerr(js, "Invalid Map object");
	const char *key_str = jsval_to_key(js, args[0]);

	map_entry_t *entry;
	HASH_FIND_STR(*map_ptr, key_str, entry);
	if (entry) {
	entry->value = args[1];
	} else {
	entry = ant_calloc(sizeof(map_entry_t));
	if (!entry) return js_mkerr(js, "out of memory");
	entry->key = strdup(key_str);
	entry->value = args[1];
	HASH_ADD_STR(*map_ptr, key, entry);
	}

	return this_val;
	}

	static jsval_t map_get(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "Map.get() requires 1 argument");

	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);
	if (!map_ptr) return js_mkundef();

	const char *key_str = jsval_to_key(js, args[0]);

	map_entry_t *entry;
	HASH_FIND_STR(*map_ptr, key_str, entry);
	return entry ? entry->value : js_mkundef();
	}

	static jsval_t map_has(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "Map.has() requires 1 argument");

	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);

	if (!map_ptr) return js_false;
	const char *key_str = jsval_to_key(js, args[0]);

	map_entry_t *entry;
	HASH_FIND_STR(*map_ptr, key_str, entry);
	return js_bool(entry != NULL);
	}

	static jsval_t map_delete(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "Map.delete() requires 1 argument");

	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);

	if (!map_ptr) return js_false;
	const char *key_str = jsval_to_key(js, args[0]);

	map_entry_t *entry;
	HASH_FIND_STR(*map_ptr, key_str, entry);
	if (entry) {
	HASH_DEL(*map_ptr, entry);
	free(entry->key);
	free(entry);
	return js_true;
	}
	return js_false;
	}

	static jsval_t map_clear(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);
	if (!map_ptr) return js_mkundef();

	map_entry_t entry, tmp;
	HASH_ITER(hh, *map_ptr, entry, tmp) {
	HASH_DEL(*map_ptr, entry);
	free(entry->key);
	free(entry);
	}
	*map_ptr = NULL;

	return js_mkundef();
	}

	static jsval_t map_size(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);
	if (!map_ptr) return js_mknum(0);

	return js_mknum((double)HASH_COUNT(*map_ptr));
	}

	static jsval_t map_forEach(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js->this_val;
	map_entry_t **map_ptr = get_map_from_obj(js, this_val);

	if (nargs < 1 \|\| vtype(args[0]) != T_FUNC)
	return js_mkerr(js, "forEach requires a callback function");

	jsval_t callback = args[0];

	if (map_ptr && *map_ptr) {
	map_entry_t entry, tmp;
	HASH_ITER(hh, *map_ptr, entry, tmp) {
	jsval_t k = js_mkstr(js, entry->key, strlen(entry->key));
	jsval_t call_args[3] = { entry->value, k, this_val };
	jsval_t result = js_call(js, callback, call_args, 3);
	if (is_err(result)) return result;
	}
	}

	return js_mkundef();
	}

	static jsval_t map_iter_next(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js->this_val;

	map_iterator_state_t *state = get_map_iter_state(js, this_val);
	if (!state) return js_mkerr(js, "Invalid iterator");

	jsval_t result = js_mkobj(js);

	if (!state->current) {
	js_set(js, result, "done", js_true);
	js_set(js, result, "value", js_mkundef());
	return result;
	}

	map_entry_t *entry = state->current;
	jsval_t value;

	switch (state->type) {
	case ITER_TYPE_MAP_VALUES:
	value = entry->value;
	break;
	case ITER_TYPE_MAP_KEYS:
	value = js_mkstr(js, entry->key, strlen(entry->key));
	break;
	case ITER_TYPE_MAP_ENTRIES: {
	jsval_t pair = js_mkarr(js);
	js_arr_push(js, pair, js_mkstr(js, entry->key, strlen(entry->key)));
	js_arr_push(js, pair, entry->value);
	value = pair;
	break;
	}
	default:
	value = js_mkundef();
	}

	state->current = entry->hh.next;

	js_set(js, result, "value", value);
	js_set(js, result, "done", js_false);
	return result;
	}

	static jsval_t create_map_iterator(ant_t *js, jsval_t map_obj, iter_type_t type) {
	map_entry_t **map_ptr = get_map_from_obj(js, map_obj);

	map_iterator_state_t *state = ant_calloc(sizeof(map_iterator_state_t));
	if (!state) return js_mkerr(js, "out of memory");

	state->head = map_ptr;
	state->current = map_ptr ? *map_ptr : NULL;
	state->type = type;

	jsval_t iter = js_mkobj(js);
	js_set_slot(js, iter, SLOT_ITER_STATE, ANT_PTR(state));
	js_set(js, iter, "next", js_mkfun(map_iter_next));

	const char *iter_key = get_iterator_sym_key();
	if (iter_key && iter_key[0]) {
	js_set(js, iter, iter_key, js_mkfun(iter_return_this));
	}

	return iter;
	}

	static jsval_t map_values(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_map_iterator(js, js->this_val, ITER_TYPE_MAP_VALUES);
	}

	static jsval_t map_keys(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_map_iterator(js, js->this_val, ITER_TYPE_MAP_KEYS);
	}

	static jsval_t map_entries(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_map_iterator(js, js->this_val, ITER_TYPE_MAP_ENTRIES);
	}

	static jsval_t map_iterator(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_map_iterator(js, js->this_val, ITER_TYPE_MAP_ENTRIES);
	}

	static jsval_t set_iter_next(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js->this_val;

	set_iterator_state_t *state = get_set_iter_state(js, this_val);
	if (!state) return js_mkerr(js, "Invalid iterator");

	jsval_t result = js_mkobj(js);

	if (!state->current) {
	js_set(js, result, "done", js_true);
	js_set(js, result, "value", js_mkundef());
	return result;
	}

	set_entry_t *entry = state->current;
	jsval_t value;

	if (state->type == ITER_TYPE_SET_ENTRIES) {
	jsval_t pair = js_mkarr(js);
	js_arr_push(js, pair, entry->value);
	js_arr_push(js, pair, entry->value);
	value = pair;
	} else {
	value = entry->value;
	}

	state->current = entry->hh.next;

	js_set(js, result, "value", value);
	js_set(js, result, "done", js_false);
	return result;
	}

	static jsval_t create_set_iterator(ant_t *js, jsval_t set_obj, iter_type_t type) {
	set_entry_t **set_ptr = get_set_from_obj(js, set_obj);

	set_iterator_state_t *state = ant_calloc(sizeof(set_iterator_state_t));
	if (!state) return js_mkerr(js, "out of memory");

	state->head = set_ptr;
	state->current = set_ptr ? *set_ptr : NULL;
	state->type = type;

	jsval_t iter = js_mkobj(js);
	js_set_slot(js, iter, SLOT_ITER_STATE, ANT_PTR(state));
	js_set(js, iter, "next", js_mkfun(set_iter_next));

	const char *iter_key = get_iterator_sym_key();
	if (iter_key && iter_key[0]) {
	js_set(js, iter, iter_key, js_mkfun(iter_return_this));
	}

	return iter;
	}

	static jsval_t set_add(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "Set.add() requires 1 argument");

	jsval_t this_val = js->this_val;
	set_entry_t **set_ptr = get_set_from_obj(js, this_val);
	if (!set_ptr) return js_mkerr(js, "Invalid Set object");

	const char *key_str = jsval_to_key(js, args[0]);

	set_entry_t *entry;
	HASH_FIND_STR(*set_ptr, key_str, entry);

	if (!entry) {
	entry = ant_calloc(sizeof(set_entry_t));
	if (!entry) return js_mkerr(js, "out of memory");
	entry->value = args[0];
	entry->key = strdup(key_str);
	HASH_ADD_KEYPTR(hh, *set_ptr, entry->key, strlen(entry->key), entry);
	}

	return this_val;
	}

	static jsval_t set_has(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "Set.has() requires 1 argument");

	jsval_t this_val = js->this_val;
	set_entry_t **set_ptr = get_set_from_obj(js, this_val);
	if (!set_ptr) return js_false;

	const char *key_str = jsval_to_key(js, args[0]);

	set_entry_t *entry;
	HASH_FIND_STR(*set_ptr, key_str, entry);
	return js_bool(entry != NULL);
	}

	static jsval_t set_delete(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "Set.delete() requires 1 argument");

	jsval_t this_val = js->this_val;
	set_entry_t **set_ptr = get_set_from_obj(js, this_val);
	if (!set_ptr) return js_false;

	const char *key_str = jsval_to_key(js, args[0]);
	set_entry_t *entry;
	HASH_FIND_STR(*set_ptr, key_str, entry);

	if (entry) {
	HASH_DEL(*set_ptr, entry);
	free(entry->key);
	free(entry);
	return js_true;
	}
	return js_false;
	}

	static jsval_t set_clear(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js->this_val;
	set_entry_t **set_ptr = get_set_from_obj(js, this_val);
	if (!set_ptr) return js_mkundef();

	set_entry_t entry, tmp;
	HASH_ITER(hh, *set_ptr, entry, tmp) {
	HASH_DEL(*set_ptr, entry);
	free(entry->key);
	free(entry);
	}
	*set_ptr = NULL;

	return js_mkundef();
	}

	static jsval_t set_size(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js->this_val;
	set_entry_t **set_ptr = get_set_from_obj(js, this_val);
	if (!set_ptr) return js_mknum(0);

	return js_mknum((double)HASH_COUNT(*set_ptr));
	}

	static jsval_t set_values(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_set_iterator(js, js->this_val, ITER_TYPE_SET_VALUES);
	}

	static jsval_t set_entries(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_set_iterator(js, js->this_val, ITER_TYPE_SET_ENTRIES);
	}

	static jsval_t set_iterator(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return create_set_iterator(js, js->this_val, ITER_TYPE_SET_VALUES);
	}

	static jsval_t set_forEach(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js->this_val;
	set_entry_t **set_ptr = get_set_from_obj(js, this_val);

	if (nargs < 1 \|\| vtype(args[0]) != T_FUNC)
	return js_mkerr(js, "forEach requires a callback function");

	jsval_t callback = args[0];

	if (set_ptr && *set_ptr) {
	set_entry_t entry, tmp;
	HASH_ITER(hh, *set_ptr, entry, tmp) {
	jsval_t call_args[3] = { entry->value, entry->value, this_val };
	jsval_t result = js_call(js, callback, call_args, 3);
	if (is_err(result)) return result;
	}
	}

	return js_mkundef();
	}

	static jsval_t weakmap_set(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "WeakMap.set() requires 2 arguments");

	jsval_t this_val = js->this_val;
	weakmap_entry_t **wm_ptr = get_weakmap_from_obj(js, this_val);
	if (!wm_ptr) return js_mkerr(js, "Invalid WeakMap object");

	if (vtype(args[0]) != T_OBJ)
	return js_mkerr(js, "WeakMap key must be an object");

	jsval_t key_obj = args[0];

	weakmap_entry_t *entry;
	HASH_FIND(hh, *wm_ptr, &key_obj, sizeof(jsval_t), entry);
	if (entry) {
	entry->value = args[1];
	} else {
	entry = ant_calloc(sizeof(weakmap_entry_t));
	if (!entry) return js_mkerr(js, "out of memory");
	entry->key_obj = key_obj;
	entry->value = args[1];
	HASH_ADD(hh, *wm_ptr, key_obj, sizeof(jsval_t), entry);
	}

	return this_val;
	}

	static jsval_t weakmap_get(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "WeakMap.get() requires 1 argument");

	jsval_t this_val = js->this_val;
	weakmap_entry_t **wm_ptr = get_weakmap_from_obj(js, this_val);
	if (!wm_ptr) return js_mkundef();

	if (vtype(args[0]) != T_OBJ) return js_mkundef();

	jsval_t key_obj = args[0];
	weakmap_entry_t *entry;
	HASH_FIND(hh, *wm_ptr, &key_obj, sizeof(jsval_t), entry);
	return entry ? entry->value : js_mkundef();
	}

	static jsval_t weakmap_has(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "WeakMap.has() requires 1 argument");

	jsval_t this_val = js->this_val;
	weakmap_entry_t **wm_ptr = get_weakmap_from_obj(js, this_val);
	if (!wm_ptr) return js_false;

	if (vtype(args[0]) != T_OBJ) return js_false;

	jsval_t key_obj = args[0];
	weakmap_entry_t *entry;
	HASH_FIND(hh, *wm_ptr, &key_obj, sizeof(jsval_t), entry);
	return js_bool(entry != NULL);
	}

	static jsval_t weakmap_delete(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "WeakMap.delete() requires 1 argument");

	jsval_t this_val = js->this_val;
	weakmap_entry_t **wm_ptr = get_weakmap_from_obj(js, this_val);
	if (!wm_ptr) return js_false;

	if (vtype(args[0]) != T_OBJ) return js_false;

	jsval_t key_obj = args[0];
	weakmap_entry_t *entry;
	HASH_FIND(hh, *wm_ptr, &key_obj, sizeof(jsval_t), entry);
	if (entry) {
	HASH_DEL(*wm_ptr, entry);
	free(entry);
	return js_true;
	}
	return js_false;
	}

	static jsval_t weakset_add(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "WeakSet.add() requires 1 argument");

	jsval_t this_val = js->this_val;
	weakset_entry_t **ws_ptr = get_weakset_from_obj(js, this_val);
	if (!ws_ptr) return js_mkerr(js, "Invalid WeakSet object");

	if (vtype(args[0]) != T_OBJ)
	return js_mkerr(js, "WeakSet value must be an object");

	jsval_t value_obj = args[0];

	weakset_entry_t *entry;
	HASH_FIND(hh, *ws_ptr, &value_obj, sizeof(jsval_t), entry);

	if (!entry) {
	entry = ant_calloc(sizeof(weakset_entry_t));
	if (!entry) return js_mkerr(js, "out of memory");
	entry->value_obj = value_obj;
	HASH_ADD(hh, *ws_ptr, value_obj, sizeof(jsval_t), entry);
	}

	return this_val;
	}

	static jsval_t weakset_has(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "WeakSet.has() requires 1 argument");

	jsval_t this_val = js->this_val;
	weakset_entry_t **ws_ptr = get_weakset_from_obj(js, this_val);
	if (!ws_ptr) return js_false;

	if (vtype(args[0]) != T_OBJ) return js_false;

	jsval_t value_obj = args[0];
	weakset_entry_t *entry;
	HASH_FIND(hh, *ws_ptr, &value_obj, sizeof(jsval_t), entry);
	return js_bool(entry != NULL);
	}

	static jsval_t weakset_delete(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "WeakSet.delete() requires 1 argument");

	jsval_t this_val = js->this_val;
	weakset_entry_t **ws_ptr = get_weakset_from_obj(js, this_val);
	if (!ws_ptr) return js_false;

	if (vtype(args[0]) != T_OBJ) return js_false;

	jsval_t value_obj = args[0];
	weakset_entry_t *entry;
	HASH_FIND(hh, *ws_ptr, &value_obj, sizeof(jsval_t), entry);

	if (entry) {
	HASH_DEL(*ws_ptr, entry);
	free(entry);
	return js_true;
	}
	return js_false;
	}

	static jsval_t builtin_WeakRef(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) {
	return js_mkerr(js, "WeakRef target must be an object");
	}

	jsval_t wr_obj = js_mkobj(js);
	jsval_t wr_proto = js_get_ctor_proto(js, "WeakRef", 7);
	if (is_special_object(wr_proto)) js_set_proto(js, wr_obj, wr_proto);
	js_set_slot(js, wr_obj, SLOT_DATA, args[0]);

	return wr_obj;
	}

	static jsval_t weakref_deref(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js->this_val;
	if (vtype(this_val) != T_OBJ) return js_mkundef();

	jsval_t target = js_get_slot(js, this_val, SLOT_DATA);
	if (vtype(target) != T_OBJ) return js_mkundef();

	return target;
	}

	static jsval_t builtin_FinalizationRegistry(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| (vtype(args[0]) != T_FUNC && vtype(args[0]) != T_CFUNC)) {
	return js_mkerr(js, "FinalizationRegistry callback must be a function");
	}

	jsval_t fr_obj = js_mkobj(js);
	jsval_t fr_proto = js_get_ctor_proto(js, "FinalizationRegistry", 20);
	if (is_special_object(fr_proto)) js_set_proto(js, fr_obj, fr_proto);

	js_set_slot(js, fr_obj, SLOT_DATA, args[0]);
	js_set_slot(js, fr_obj, SLOT_MAP, mkarr(js));

	return fr_obj;
	}

	static jsval_t finreg_register(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js->this_val;
	if (vtype(this_val) != T_OBJ) return js_mkundef();

	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) {
	return js_mkerr(js, "FinalizationRegistry.register target must be an object");
	}

	jsval_t target = args[0];
	jsval_t held_value = nargs > 1 ? args[1] : js_mkundef();
	jsval_t unregister_token = nargs > 2 ? args[2] : js_mkundef();

	if (vdata(target) == vdata(held_value) && vtype(held_value) == T_OBJ) {
	return js_mkerr(js, "target and held value must not be the same");
	}

	jsval_t registrations = js_get_slot(js, this_val, SLOT_MAP);
	if (vtype(registrations) != T_ARR) return js_mkundef();

	jsval_t entry = mkarr(js);
	jsoff_t len = js_arr_len(js, registrations);

	char idx[16];
	size_t idx_len = uint_to_str(idx, sizeof(idx), 0);
	js_setprop(js, entry, js_mkstr(js, idx, idx_len), target);
	idx_len = uint_to_str(idx, sizeof(idx), 1);
	js_setprop(js, entry, js_mkstr(js, idx, idx_len), held_value);
	idx_len = uint_to_str(idx, sizeof(idx), 2);
	js_setprop(js, entry, js_mkstr(js, idx, idx_len), unregister_token);
	js_setprop(js, entry, js_mkstr(js, "length", 6), tov(3.0));

	idx_len = uint_to_str(idx, sizeof(idx), len);
	js_setprop(js, registrations, js_mkstr(js, idx, idx_len), entry);
	js_setprop(js, registrations, js_mkstr(js, "length", 6), tov((double)(len + 1)));

	return js_mkundef();
	}

	static jsval_t finreg_unregister(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js->this_val;
	if (vtype(this_val) != T_OBJ) return js_false;

	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) {
	return js_mkerr(js, "FinalizationRegistry.unregister token must be an object");
	}

	jsval_t token = args[0];
	jsval_t registrations = js_get_slot(js, this_val, SLOT_MAP);
	if (vtype(registrations) != T_ARR) return js_false;

	jsoff_t len = js_arr_len(js, registrations);
	bool removed = false;

	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, registrations, i);
	if (vtype(entry) != T_ARR) continue;
	jsval_t entry_token = js_arr_get(js, entry, 2);
	if (vtype(entry_token) == T_OBJ && vdata(entry_token) == vdata(token)) {
	char idx[16];
	size_t idx_len = uint_to_str(idx, sizeof(idx), i);
	js_setprop(js, registrations, js_mkstr(js, idx, idx_len), js_mkundef());
	removed = true;
	}
	}

	return js_bool(removed);
	}

	static jsval_t builtin_Map(ant_t js, jsval_t args, int nargs) {
	jsval_t map_obj = js_mkobj(js);
	jsoff_t obj_offset = (jsoff_t)vdata(map_obj);

	jsval_t map_proto = js_get_ctor_proto(js, "Map", 3);
	if (is_special_object(map_proto)) js_set_proto(js, map_obj, map_proto);

	map_entry_t *map_head = ant_calloc(sizeof(map_entry_t ));
	if (!map_head) return js_mkerr(js, "out of memory");
	*map_head = NULL;

	register_map(map_head, obj_offset);
	js_set_slot(js, map_obj, SLOT_MAP, ANT_PTR(map_head));

	if (nargs == 0 \|\| vtype(args[0]) != T_ARR) return map_obj;

	jsval_t iterable = args[0];
	jsoff_t length = js_arr_len(js, iterable);

	for (jsoff_t i = 0; i < length; i++) {
	jsval_t entry = js_arr_get(js, iterable, i);
	if (vtype(entry) != T_ARR) continue;

	jsoff_t entry_len = js_arr_len(js, entry);
	if (entry_len < 2) continue;

	jsval_t key = js_arr_get(js, entry, 0);
	jsval_t value = js_arr_get(js, entry, 1);
	const char *key_str = jsval_to_key(js, key);

	map_entry_t *map_entry;
	HASH_FIND_STR(*map_head, key_str, map_entry);
	if (map_entry) {
	map_entry->value = value;
	continue;
	}

	map_entry = ant_calloc(sizeof(map_entry_t));
	if (!map_entry) return js_mkerr(js, "out of memory");
	map_entry->key = strdup(key_str);
	map_entry->value = value;
	HASH_ADD_STR(*map_head, key, map_entry);
	}

	return map_obj;
	}

	static jsval_t builtin_Set(ant_t js, jsval_t args, int nargs) {
	jsval_t set_obj = js_mkobj(js);
	jsoff_t obj_offset = (jsoff_t)vdata(set_obj);

	jsval_t set_proto = js_get_ctor_proto(js, "Set", 3);
	if (is_special_object(set_proto)) js_set_proto(js, set_obj, set_proto);

	set_entry_t *set_head = ant_calloc(sizeof(set_entry_t ));
	if (!set_head) return js_mkerr(js, "out of memory");
	*set_head = NULL;

	register_set(set_head, obj_offset);
	js_set_slot(js, set_obj, SLOT_SET, ANT_PTR(set_head));

	if (nargs == 0 \|\| vtype(args[0]) != T_ARR) return set_obj;

	jsval_t iterable = args[0];
	jsoff_t length = js_arr_len(js, iterable);

	for (jsoff_t i = 0; i < length; i++) {
	jsval_t value = js_arr_get(js, iterable, i);
	const char *key_str = jsval_to_key(js, value);

	set_entry_t *entry;
	HASH_FIND_STR(*set_head, key_str, entry);
	if (entry) continue;

	entry = ant_calloc(sizeof(set_entry_t));
	if (!entry) return js_mkerr(js, "out of memory");
	entry->value = value;
	entry->key = strdup(key_str);
	HASH_ADD_KEYPTR(hh, *set_head, entry->key, strlen(entry->key), entry);
	}

	return set_obj;
	}

	static jsval_t builtin_WeakMap(ant_t js, jsval_t args, int nargs) {
	jsval_t wm_obj = js_mkobj(js);

	jsval_t wm_proto = js_get_ctor_proto(js, "WeakMap", 7);
	if (is_special_object(wm_proto)) js_set_proto(js, wm_obj, wm_proto);

	weakmap_entry_t *wm_head = ant_calloc(sizeof(weakmap_entry_t ));
	if (!wm_head) return js_mkerr(js, "out of memory");
	*wm_head = NULL;

	js_set_slot(js, wm_obj, SLOT_DATA, ANT_PTR(wm_head));

	if (nargs == 0 \|\| vtype(args[0]) != T_ARR) return wm_obj;

	jsval_t iterable = args[0];
	jsoff_t length = js_arr_len(js, iterable);

	for (jsoff_t i = 0; i < length; i++) {
	jsval_t entry = js_arr_get(js, iterable, i);
	if (vtype(entry) != T_ARR) continue;

	jsoff_t entry_len = js_arr_len(js, entry);
	if (entry_len < 2) continue;

	jsval_t key = js_arr_get(js, entry, 0);
	jsval_t value = js_arr_get(js, entry, 1);

	if (vtype(key) != T_OBJ) return js_mkerr(js, "WeakMap key must be an object");

	weakmap_entry_t *wm_entry;
	HASH_FIND(hh, *wm_head, &key, sizeof(jsval_t), wm_entry);
	if (wm_entry) {
	wm_entry->value = value;
	continue;
	}

	wm_entry = ant_calloc(sizeof(weakmap_entry_t));
	if (!wm_entry) return js_mkerr(js, "out of memory");
	wm_entry->key_obj = key;
	wm_entry->value = value;
	HASH_ADD(hh, *wm_head, key_obj, sizeof(jsval_t), wm_entry);
	}

	return wm_obj;
	}

	static jsval_t builtin_WeakSet(ant_t js, jsval_t args, int nargs) {
	jsval_t ws_obj = js_mkobj(js);

	jsval_t ws_proto = js_get_ctor_proto(js, "WeakSet", 7);
	if (is_special_object(ws_proto)) js_set_proto(js, ws_obj, ws_proto);

	weakset_entry_t *ws_head = ant_calloc(sizeof(weakset_entry_t ));
	if (!ws_head) return js_mkerr(js, "out of memory");
	*ws_head = NULL;

	js_set_slot(js, ws_obj, SLOT_DATA, ANT_PTR(ws_head));

	if (nargs == 0 \|\| vtype(args[0]) != T_ARR) return ws_obj;

	jsval_t iterable = args[0];
	jsoff_t length = js_arr_len(js, iterable);

	for (jsoff_t i = 0; i < length; i++) {
	jsval_t value = js_arr_get(js, iterable, i);

	if (vtype(value) != T_OBJ) return js_mkerr(js, "WeakSet value must be an object");

	weakset_entry_t *entry;
	HASH_FIND(hh, *ws_head, &value, sizeof(jsval_t), entry);
	if (entry) continue;

	entry = ant_calloc(sizeof(weakset_entry_t));
	if (!entry) return js_mkerr(js, "out of memory");
	entry->value_obj = value;
	HASH_ADD(hh, *ws_head, value_obj, sizeof(jsval_t), entry);
	}

	return ws_obj;
	}

	void init_collections_module(void) {
	ant_t *js = rt->js;

	jsval_t glob = js->global;
	jsval_t object_proto = js->object;

	const char *iter_key = get_iterator_sym_key();
	const char *toStringTag_key = get_toStringTag_sym_key();

	jsval_t map_proto = js_mkobj(js);
	js_set_proto(js, map_proto, object_proto);
	js_set(js, map_proto, "set", js_mkfun(map_set));
	js_set(js, map_proto, "get", js_mkfun(map_get));
	js_set(js, map_proto, "has", js_mkfun(map_has));
	js_set(js, map_proto, "delete", js_mkfun(map_delete));
	js_set(js, map_proto, "clear", js_mkfun(map_clear));
	js_set(js, map_proto, "size", js_mkfun(map_size));
	js_set(js, map_proto, "entries", js_mkfun(map_entries));
	js_set(js, map_proto, "keys", js_mkfun(map_keys));
	js_set(js, map_proto, "values", js_mkfun(map_values));
	js_set(js, map_proto, "forEach", js_mkfun(map_forEach));
	js_set(js, map_proto, iter_key, js_mkfun(map_iterator));
	js_set(js, map_proto, toStringTag_key, js_mkstr(js, "Map", 3));

	jsval_t map_ctor = js_mkobj(js);
	js_set_slot(js, map_ctor, SLOT_CFUNC, js_mkfun(builtin_Map));
	js_mkprop_fast(js, map_ctor, "prototype", 9, map_proto);
	js_mkprop_fast(js, map_ctor, "name", 4, ANT_STRING("Map"));
	js_set_descriptor(js, map_ctor, "name", 4, 0);
	js_set(js, glob, "Map", js_obj_to_func(map_ctor));

	jsval_t set_proto = js_mkobj(js);
	js_set_proto(js, set_proto, object_proto);
	js_set(js, set_proto, "add", js_mkfun(set_add));
	js_set(js, set_proto, "has", js_mkfun(set_has));
	js_set(js, set_proto, "delete", js_mkfun(set_delete));
	js_set(js, set_proto, "clear", js_mkfun(set_clear));
	js_set(js, set_proto, "size", js_mkfun(set_size));
	js_set(js, set_proto, "values", js_mkfun(set_values));
	js_set(js, set_proto, "keys", js_mkfun(set_values));
	js_set(js, set_proto, "entries", js_mkfun(set_entries));
	js_set(js, set_proto, "forEach", js_mkfun(set_forEach));
	js_set(js, set_proto, iter_key, js_mkfun(set_iterator));
	js_set(js, set_proto, toStringTag_key, js_mkstr(js, "Set", 3));

	jsval_t set_ctor = js_mkobj(js);
	js_set_slot(js, set_ctor, SLOT_CFUNC, js_mkfun(builtin_Set));
	js_mkprop_fast(js, set_ctor, "prototype", 9, set_proto);
	js_mkprop_fast(js, set_ctor, "name", 4, ANT_STRING("Set"));
	js_set_descriptor(js, set_ctor, "name", 4, 0);
	js_set(js, glob, "Set", js_obj_to_func(set_ctor));

	jsval_t weakmap_proto = js_mkobj(js);
	js_set_proto(js, weakmap_proto, object_proto);
	js_set(js, weakmap_proto, "set", js_mkfun(weakmap_set));
	js_set(js, weakmap_proto, "get", js_mkfun(weakmap_get));
	js_set(js, weakmap_proto, "has", js_mkfun(weakmap_has));
	js_set(js, weakmap_proto, "delete", js_mkfun(weakmap_delete));
	js_set(js, weakmap_proto, toStringTag_key, js_mkstr(js, "WeakMap", 7));

	jsval_t weakmap_ctor = js_mkobj(js);
	js_set_slot(js, weakmap_ctor, SLOT_CFUNC, js_mkfun(builtin_WeakMap));
	js_mkprop_fast(js, weakmap_ctor, "prototype", 9, weakmap_proto);
	js_mkprop_fast(js, weakmap_ctor, "name", 4, ANT_STRING("WeakMap"));
	js_set_descriptor(js, weakmap_ctor, "name", 4, 0);
	js_set(js, glob, "WeakMap", js_obj_to_func(weakmap_ctor));

	jsval_t weakset_proto = js_mkobj(js);
	js_set_proto(js, weakset_proto, object_proto);
	js_set(js, weakset_proto, "add", js_mkfun(weakset_add));
	js_set(js, weakset_proto, "has", js_mkfun(weakset_has));
	js_set(js, weakset_proto, "delete", js_mkfun(weakset_delete));
	js_set(js, weakset_proto, toStringTag_key, js_mkstr(js, "WeakSet", 7));

	jsval_t weakset_ctor = js_mkobj(js);
	js_set_slot(js, weakset_ctor, SLOT_CFUNC, js_mkfun(builtin_WeakSet));
	js_mkprop_fast(js, weakset_ctor, "prototype", 9, weakset_proto);
	js_mkprop_fast(js, weakset_ctor, "name", 4, ANT_STRING("WeakSet"));
	js_set_descriptor(js, weakset_ctor, "name", 4, 0);
	js_set(js, glob, "WeakSet", js_obj_to_func(weakset_ctor));

	jsval_t weakref_proto = js_mkobj(js);
	js_set_proto(js, weakref_proto, object_proto);
	js_set(js, weakref_proto, "deref", js_mkfun(weakref_deref));
	js_set(js, weakref_proto, toStringTag_key, js_mkstr(js, "WeakRef", 7));

	jsval_t weakref_ctor = js_mkobj(js);
	js_set_slot(js, weakref_ctor, SLOT_CFUNC, js_mkfun(builtin_WeakRef));
	js_mkprop_fast(js, weakref_ctor, "prototype", 9, weakref_proto);
	js_mkprop_fast(js, weakref_ctor, "name", 4, ANT_STRING("WeakRef"));
	js_set_descriptor(js, weakref_ctor, "name", 4, 0);
	js_set(js, glob, "WeakRef", js_obj_to_func(weakref_ctor));

	jsval_t finreg_proto = js_mkobj(js);
	js_set_proto(js, finreg_proto, object_proto);
	js_set(js, finreg_proto, "register", js_mkfun(finreg_register));
	js_set(js, finreg_proto, "unregister", js_mkfun(finreg_unregister));
	js_set(js, finreg_proto, toStringTag_key, js_mkstr(js, "FinalizationRegistry", 20));

	jsval_t finreg_ctor = js_mkobj(js);
	js_set_slot(js, finreg_ctor, SLOT_CFUNC, js_mkfun(builtin_FinalizationRegistry));
	js_mkprop_fast(js, finreg_ctor, "prototype", 9, finreg_proto);
	js_mkprop_fast(js, finreg_ctor, "name", 4, ANT_STRING("FinalizationRegistry"));
	js_set_descriptor(js, finreg_ctor, "name", 4, 0);
	js_set(js, glob, "FinalizationRegistry", js_obj_to_func(finreg_ctor));
	}

	void collections_gc_reserve_roots(void (op_val)(void , jsval_t ), void ctx) {
	for (size_t i = 0; i < map_registry_count; i++) {
	jsval_t map_obj = mkval(T_OBJ, map_registry[i].obj_offset);
	op_val(ctx, &map_obj); map_entry_t **head = map_registry[i].head;
	if (head && *head) {
	map_entry_t entry, tmp;
	HASH_ITER(hh, *head, entry, tmp) op_val(ctx, &entry->value);
	}
	}

	for (size_t i = 0; i < set_registry_count; i++) {
	jsval_t set_obj = mkval(T_OBJ, set_registry[i].obj_offset);
	op_val(ctx, &set_obj); set_entry_t **head = set_registry[i].head;
	if (head && *head) {
	set_entry_t entry, tmp;
	HASH_ITER(hh, *head, entry, tmp) op_val(ctx, &entry->value);
	}
	}
	}

	static void free_map_entries(map_entry_t **head) {
	if (!head \|\| !*head) return;
	map_entry_t entry, tmp;
	HASH_ITER(hh, *head, entry, tmp) {
	HASH_DEL(*head, entry);
	free(entry->key);
	free(entry);
	}
	}

	static void free_set_entries(set_entry_t **head) {
	if (!head \|\| !*head) return;
	set_entry_t entry, tmp;
	HASH_ITER(hh, *head, entry, tmp) {
	HASH_DEL(*head, entry);
	free(entry->key);
	free(entry);
	}
	}

	void collections_gc_update_roots(jsoff_t (fwd_off)(void ctx, jsoff_t old), GC_OP_VAL_ARGS) {
	size_t write_idx = 0;

	for (size_t i = 0; i < map_registry_count; i++) {
	jsoff_t old_off = map_registry[i].obj_offset;
	jsoff_t new_off = fwd_off(ctx, old_off);

	if (new_off == 0) {
	free_map_entries(map_registry[i].head);
	free(map_registry[i].head);
	continue;
	}

	map_registry[i].obj_offset = new_off;

	map_entry_t **head = map_registry[i].head;
	if (head && *head) {
	map_entry_t entry, tmp;
	HASH_ITER(hh, *head, entry, tmp) op_val(ctx, &entry->value);
	}

	if (write_idx != i) map_registry[write_idx] = map_registry[i];
	write_idx++;
	}
	map_registry_count = write_idx;

	write_idx = 0;
	for (size_t i = 0; i < set_registry_count; i++) {
	jsoff_t old_off = set_registry[i].obj_offset;
	jsoff_t new_off = fwd_off(ctx, old_off);

	if (new_off == 0) {
	free_set_entries(set_registry[i].head);
	free(set_registry[i].head);
	continue;
	}

	set_registry[i].obj_offset = new_off;

	set_entry_t **head = set_registry[i].head;
	if (head && *head) {
	set_entry_t entry, tmp;
	HASH_ITER(hh, *head, entry, tmp) op_val(ctx, &entry->value);
	}

	if (write_idx != i) set_registry[write_idx] = set_registry[i];
	write_idx++;
	}
	set_registry_count = write_idx;
	}

	void cleanup_collections_module(void) {
	for (size_t i = 0; i < map_registry_count; i++) {
	free_map_entries(map_registry[i].head);
	free(map_registry[i].head);
	}
	free(map_registry);
	map_registry = NULL;
	map_registry_count = 0;
	map_registry_cap = 0;

	for (size_t i = 0; i < set_registry_count; i++) {
	free_set_entries(set_registry[i].head);
	free(set_registry[i].head);
	}
	free(set_registry);
	set_registry = NULL;
	set_registry_count = 0;
	set_registry_cap = 0;
	}

	size_t collections_get_external_memory(void) {
	size_t total = 0;

	total += map_registry_cap * sizeof(map_registry_entry_t);
	for (size_t i = 0; i < map_registry_count; i++) {
	total += sizeof(map_entry_t *);
	if (map_registry[i].head) {
	map_entry_t entry, tmp;
	HASH_ITER(hh, *map_registry[i].head, entry, tmp) {
	total += sizeof(map_entry_t);
	if (entry->key) total += strlen(entry->key) + 1;
	}
	}
	}

	total += set_registry_cap * sizeof(set_registry_entry_t);
	for (size_t i = 0; i < set_registry_count; i++) {
	total += sizeof(set_entry_t *);
	if (set_registry[i].head) {
	set_entry_t entry, tmp;
	HASH_ITER(hh, *set_registry[i].head, entry, tmp) {
	total += sizeof(set_entry_t);
	if (entry->key) total += strlen(entry->key) + 1;
	}
	}
	}

	return total;
	}

	#undef CLEANUP_REGISTRY

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