js/src/tests/js1_8_5/regress/regress-591846.js@6474c204b198
js/src/tests/js1_8_5/regress/regress-591846.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 /*
2 * Any copyright is dedicated to the Public Domain.
3 * http://creativecommons.org/licenses/publicdomain/
4 */
6 function check(obj, name, value, readonly) {
7 // Start with a non-configurable, writable data property implemented via
8 // js::PropertyOp getter and setter.
9 var pd = Object.getOwnPropertyDescriptor(obj, name);
11 assertEq(pd.configurable, false, "non-configurable " + name);
12 assertEq(pd.writable, !readonly, "writable " + name);
14 try {
15 // Do not allow a transition from js::PropertyOp to writable js::Value
16 // data property.
17 Object.defineProperty(obj, name, {writable: true});
18 assertEq(0, 1);
19 } catch (e) {
20 assertEq('' + e, "TypeError: can't redefine non-configurable property '" + name + "'");
21 }
23 if (!readonly) {
24 try {
25 // Do not allow the property denoted by name to become a true data
26 // property via a descriptor that preserves the native property's
27 // writable attribute.
28 Object.defineProperty(obj, name, {value: value});
29 assertEq(0, 1);
30 } catch (e) {
31 assertEq('' + e, "TypeError: can't redefine non-configurable property '" + name + "'");
32 }
33 }
35 try {
36 // Do not allow the property to be frozen at some bogus value.
37 Object.defineProperty(obj, name, {value: "bogus", writable: false});
38 assertEq(0, 1);
39 } catch (e) {
40 assertEq('' + e, "TypeError: can't redefine non-configurable property '" + name + "'");
41 }
43 // Now make name non-writable.
44 Object.defineProperty(obj, name, {writable: false})
46 // Assert that the right getter result "stuck".
47 assertEq(obj[name], value);
49 // Test that it is operationally non-writable now.
50 obj[name] = "eek!";
51 assertEq(obj[name], value);
52 }
54 check(Object, 'caller', null, false);
55 check(Object, 'arguments', null, false);
57 // Reset RegExp.leftContext to the empty string.
58 /x/.test('x');
60 var d = Object.getOwnPropertyDescriptor(RegExp, "leftContext");
61 assertEq(d.set, undefined);
62 assertEq(typeof d.get, "function");
63 assertEq(d.enumerable, true);
64 assertEq(d.configurable, false);
65 assertEq(d.get.call(RegExp), "");
67 reportCompare(0, 0, "ok");
