The Tor Browser / file comparison
comparison: js/src/tests/js1_8_5/regress/regress-591846.js
js/src/tests/js1_8_5/regress/regress-591846.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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deleted
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| -1:000000000000 | 0:bfbd41eebe17 |
|---|---|
| 1 /* | |
| 2 * Any copyright is dedicated to the Public Domain. | |
| 3 * http://creativecommons.org/licenses/publicdomain/ | |
| 4 */ | |
| 5 | |
| 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); | |
| 10 | |
| 11 assertEq(pd.configurable, false, "non-configurable " + name); | |
| 12 assertEq(pd.writable, !readonly, "writable " + name); | |
| 13 | |
| 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 } | |
| 22 | |
| 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 } | |
| 34 | |
| 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 } | |
| 42 | |
| 43 // Now make name non-writable. | |
| 44 Object.defineProperty(obj, name, {writable: false}) | |
| 45 | |
| 46 // Assert that the right getter result "stuck". | |
| 47 assertEq(obj[name], value); | |
| 48 | |
| 49 // Test that it is operationally non-writable now. | |
| 50 obj[name] = "eek!"; | |
| 51 assertEq(obj[name], value); | |
| 52 } | |
| 53 | |
| 54 check(Object, 'caller', null, false); | |
| 55 check(Object, 'arguments', null, false); | |
| 56 | |
| 57 // Reset RegExp.leftContext to the empty string. | |
| 58 /x/.test('x'); | |
| 59 | |
| 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), ""); | |
| 66 | |
| 67 reportCompare(0, 0, "ok"); |
