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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 - Add availability for InternalFunction to have JS implementation"
   href="https://bugs.webkit.org/show_bug.cgi?id=147133">147133</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Add availability for InternalFunction to have JS implementation
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>528+ (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>utatane.tea&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Current Promise constructor is implemented as an InternalFunction which has C++ implementations.
But almost all processes are done in JS builtin's &#64;initializePromise function.
And after issue 147051 is landed, we can write the whole Promise constructor code in JS.

I suggest enabling InternalFunction to have JS function implementation instead of just replacing Promise constructor with a Promise builtin JS function object because if we replace the current Promise constructor with the JS function simply, we cannot leverage the getStaticFunctionSlot (&amp; its system for materializing builtin functions lazily)</pre>
        </div>
      </p>
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