[Webkit-unassigned] [Bug 33053] New: JSON.stringify implementation needlessly processes properties in the prototype chain

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=33053

           Summary: JSON.stringify implementation needlessly processes
                    properties in the prototype chain
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: ES5
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kent.hansen at nokia.com


ES5 section 15.12.3, abstract Operation JO(value), step 6:  "Let K be an
internal List of Strings consisting of the names of all the own properties of
value [...]".
The JavaScriptCore implementation is calling JSObject::getPropertyNames(),
whereas it could be calling JSObject::getOwnPropertyNames() instead.

Making this change does not affect the final output (the prototype-inherited
properties are ignored anyways, since getOwnPropertySlot() subsequently returns
false for them), but could make the implementation faster and use less memory.

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