[Webkit-unassigned] [Bug 149175] New: JS Function removed after parsing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149175

            Bug ID: 149175
           Summary: JS Function removed after parsing
    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: mail at rodneyrehm.de

Steps to reproduce:

Open http://rodneyrehm.de/t/css.escape (with cold cache / freshly started browser) and open DevTools and run `CSS.escape` to print the value.


Expected behavior:

The function's body is printed to the console


Actual behavior:

`undefined` is printed to the console


Additional Notes:

The issue cannot be reproduced reliably. Sometimes hitting Command+R will make CSS.escape actually hold the function, sometimes you need Command+Shift+R. Usually cleaning the cache and or restarting the browser before opening this page will make WebKit (or JavaScriptCore, or whatever) exhibit this behavior. Eventually CSS.escape will hold the function, but it may lose it again.

It feels like some script optimization routine is (sometimes) killing the function declaration, because it is not used immediately (i.e. dead code removal), or some such.


Live Testcase: http://rodneyrehm.de/t/css.escape
Related issue on Github: https://github.com/mathiasbynens/CSS.escape/issues/2

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