C++ (Cpp) duk_hobject_object_seal_freeze_helper Examples

Example #1

File: duk_bi_object.c Project: harold-b/duktape

DUK_INTERNAL duk_ret_t duk_bi_object_constructor_seal_freeze_shared(duk_context *ctx) {
	duk_hthread *thr = (duk_hthread *) ctx;
	duk_hobject *h;
	duk_bool_t is_freeze;

	DUK_ASSERT_TOP(ctx, 1);

	is_freeze = (duk_bool_t) duk_get_current_magic(ctx);
	if (duk_is_buffer(ctx, 0)) {
		/* Plain buffer: already sealed, but not frozen (and can't be frozen
		 * because index properties can't be made non-writable.
		 */
		if (is_freeze) {
			goto fail_cannot_freeze;
		}
		return 1;
	} else if (duk_is_lightfunc(ctx, 0)) {
		/* Lightfunc: already sealed and frozen, success. */
		return 1;
	}
#if 0
	/* Seal/freeze are quite rare in practice so it'd be nice to get the
	 * correct behavior simply via automatic promotion (at the cost of some
	 * memory churn).  However, the promoted objects don't behave the same,
	 * e.g. promoted lightfuncs are extensible.
	 */
	h = duk_require_hobject_promote_mask(ctx, 0, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER);
#endif

	h = duk_get_hobject(ctx, 0);
	if (h == NULL) {
		/* ES2015 Sections 19.1.2.5, 19.1.2.17 */
		return 1;
	}

	if (is_freeze && DUK_HOBJECT_IS_BUFOBJ(h)) {
		/* Buffer objects cannot be frozen because there's no internal
		 * support for making virtual array indices non-writable.
		 */
		DUK_DD(DUK_DDPRINT("cannot freeze a buffer object"));
		goto fail_cannot_freeze;
	}

	duk_hobject_object_seal_freeze_helper(thr, h, is_freeze);

	/* Sealed and frozen objects cannot gain any more properties,
	 * so this is a good time to compact them.
	 */
	duk_hobject_compact_props(thr, h);
	return 1;

 fail_cannot_freeze:
	DUK_DCERROR_TYPE_INVALID_ARGS(thr);  /* XXX: proper error message */
}

Example #2

File: duk_builtin_object.c Project: JoshEngebretson/duktape

static int seal_freeze_helper(duk_context *ctx, int is_freeze) {
	duk_hthread *thr = (duk_hthread *) ctx;
	duk_hobject *h;

	h = duk_require_hobject(ctx, 0);
	DUK_ASSERT(h != NULL);

	duk_hobject_object_seal_freeze_helper(thr, h, is_freeze /*freeze*/);

	/* Sealed and frozen objects cannot gain any more properties,
	 * so this is a good time to compact them.
	 */
	duk_hobject_compact_props(thr, h);

	return 1;
}

Example #3

File: duk_bi_object.c Project: cherry-wb/duktape

duk_ret_t duk_bi_object_constructor_seal_freeze_shared(duk_context *ctx) {
	duk_hthread *thr = (duk_hthread *) ctx;
	duk_hobject *h;
	duk_bool_t is_freeze;

	h = duk_require_hobject(ctx, 0);
	DUK_ASSERT(h != NULL);

	is_freeze = (duk_bool_t) duk_get_current_magic(ctx);
	duk_hobject_object_seal_freeze_helper(thr, h, is_freeze);

	/* Sealed and frozen objects cannot gain any more properties,
	 * so this is a good time to compact them.
	 */
	duk_hobject_compact_props(thr, h);

	return 1;
}

Example #4

File: duk_bi_object.c Project: CarterTsai/duktape

DUK_INTERNAL duk_ret_t duk_bi_object_constructor_seal_freeze_shared(duk_context *ctx) {
	duk_hthread *thr = (duk_hthread *) ctx;
	duk_hobject *h;
	duk_bool_t is_freeze;

	h = duk_require_hobject_or_lfunc(ctx, 0);
	if (!h) {
		/* Lightfunc, always success. */
		return 1;
	}

	is_freeze = (duk_bool_t) duk_get_current_magic(ctx);
	duk_hobject_object_seal_freeze_helper(thr, h, is_freeze);

	/* Sealed and frozen objects cannot gain any more properties,
	 * so this is a good time to compact them.
	 */
	duk_hobject_compact_props(thr, h);

	return 1;
}