[Webkit-unassigned] [Bug 158116] New: Function#arguments and Function#caller break the invariability of nonconfigurable, nonwritable properties
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu May 26 05:09:24 PDT 2016
https://bugs.webkit.org/show_bug.cgi?id=158116
Bug ID: 158116
Summary: Function#arguments and Function#caller break the
invariability of nonconfigurable, nonwritable
properties
Classification: Unclassified
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: claude.pache at gmail.com
According to [ES6 6.7.1.3] Invariants of the Essential Internal Methods:
If a property P is described as a data property with Desc.[[Value]] equal to v and Desc.[[Writable]] and Desc.[[Configurable]] are both false, then the SameValue must be returned for the Desc.[[Value]] attribute of the property on all future calls to [[GetOwnProperty]] ( P ).
[ES6 6.7.1.3]: http://www.ecma-international.org/ecma-262/6.0/#sec-invariants-of-the-essential-internal-methods
Testcase against `Function#arguments`
```js
function f() { return Object.getOwnPropertyDescriptor(f, 'arguments'); }
Object.getOwnPropertyDescriptor(f, 'arguments');
// value: null, writable: false, configurable: false
f();
// value: Arguments[], writable: false, configurable: false
```
Testcase against `Function#caller`
```js
function g() { return Object.getOwnPropertyDescriptor(g, 'caller'); }
function h() { return g(); }
Object.getOwnPropertyDescriptor(g, 'caller');
// value: null, writable: false, configurable: false
h();
// value: function h(), writable: false, configurable: false
```
Suggested fix: Use getters.
Similar bug: Bug 151348
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