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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Consider changing MachineThreads::m_registeredThreads to be a linked list of WTFThreadData."
   href="https://bugs.webkit.org/show_bug.cgi?id=170027">170027</a>
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        </tr>

        <tr>
          <th>Summary</th>
          <td>Consider changing MachineThreads::m_registeredThreads to be a linked list of WTFThreadData.
          </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>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </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>mark.lam&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Currently, MachineThreads instantiates MachineThreads::Thread (which is just a linked list node) that points to MachineThreads::ThreadData (a thread specific record that basically copies the content of WTFThreadData i.e. the stack bounds, and adds a few other things).  In order to instantiate the MachineThreads::ThreadData, the code needs to consult (and thereby create) the WTFThreadData instance anyway.

If we can lower PlatformThread to the WTF layer (and unify it with whatever representation of a thread id we have there e.g. that which is returned by currentThread()), then we can add that to WTFThreadData.  I think it is also fine to add the other platform specific MachineThreads::ThreadData fields to WTFThreadData as well.

Note: a side detail, we used to copy the stack bounds base and end.  Instead, we can change MachineStackMarker.cpp to use StackBounds::contains() instead to check the stack bounds.</pre>
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