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    <head>
      <base href="http://bugzilla.gdcproject.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 - GDC unable to de-virtualise method calls"
   href="http://bugzilla.gdcproject.org/show_bug.cgi?id=162">162</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>GDC unable to de-virtualise method calls
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>GDC
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>development
          </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>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>gdc
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>ibuclaw@gdcproject.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ibuclaw@gdcproject.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Currently we emit method calls as the following:

  *(c->__vptr + 40) (c, 1, 2, 3);

Which translate directly into the following trees:

  indirect_ref(pointer_plus(component_ref(c, __vptr), 40))


GCC provides a more simplistic tree code called obj_type_ref, which represents
a virtual method lookup, and given the binfo structure we already pass to the
backed, this would give a chance for the optimiser passes to statically
determine the dynamic type of the object and devirtualise the call.

  obj_type_ref(component_ref(c, __vptr), c, 40)</pre>
        </div>
      </p>
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