[Webkit-unassigned] [Bug 151348] New: Nonstandard RegExp own properties do not observe invariability of nonwritable, nonconfigurable property

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Nov 17 05:39:49 PST 2015


https://bugs.webkit.org/show_bug.cgi?id=151348

            Bug ID: 151348
           Summary: Nonstandard RegExp own properties do not observe
                    invariability of nonwritable, nonconfigurable property
    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

Testcase:

> Object.getOwnPropertyDescriptor(RegExp, 'lastMatch') 
< {value: "", writable: false, enumerable: true, configurable: false} 

> /a/.exec('a')

> Object.getOwnPropertyDescriptor(RegExp, 'lastMatch')
< {value: "a", writable: false, enumerable: true, configurable: false} 


The value of the property changes even when it is marked as nonwritable and nonconfigurable.
This must not be the case; for reference, see:

http://www.ecma-international.org/ecma-262/6.0/#sec-invariants-of-the-essential-internal-methods
paragraph [[GetOwnProperty]] (P), third bullet


The best thing to do, here, is to use an accessor property.

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