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      <base href="https://bugs.webkit.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - JSCell::classInfo() shouldn't have a bunch of mitigations for being called during destruction"
   href="https://bugs.webkit.org/show_bug.cgi?id=167066">167066</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>JSCell::classInfo() shouldn't have a bunch of mitigations for being called during destruction
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>JavaScriptCore
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>fpizlo&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Every time you use JSCell::classInfo(), you pay a compile time, code size, and running time cost for mitigations that are there to make that method safe to call from a destructor.

The only reason why we call that method in destructors is:

- Invalid use of jsCast&lt;&gt;.  We used to have the discipline to only use static_cast&lt;&gt; in destructors.
- Some isolated uses of the classInfo in specific subclasses.  Those can do the mitigations themselves.

We should also assert in classInfo() that we aren't destructing.</pre>
        </div>
      </p>
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