<html>

    <head>

      <base href="https://bugs.webkit.org/" />

    </head>

    <body><table border="1" cellspacing="0" cellpadding="8">

        <tr>

          <th>Bug ID</th>

          <td><a class="bz_bug_link 

          bz_status_NEW "

   title="NEW - Asserts-enabled builds fails because JSC::JSCell::inherits is not defined"

   href="https://bugs.webkit.org/show_bug.cgi?id=158672">158672</a>

          </td>

        </tr>

        <tr>

          <th>Summary</th>

          <td>Asserts-enabled builds fails because JSC::JSCell::inherits is not defined

          </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>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>jeremyhu&#64;apple.com

          </td>

        </tr></table>

      <p>

        <div>

        <pre>Recent master (r201265, b077d8fac8360fe5406bf13a44bbeff9acb0f9ea) fails to build with the following link error:

Undefined symbols for architecture x86_64:

  &quot;JSC::JSCell::inherits(JSC::ClassInfo const*) const&quot;, referenced from:

      JSC::CodeBlock::ownerScriptExecutable() const in FTLCapabilities.cpp.o

ld: symbol(s) not found for architecture x86_64

We see the usage here:

bytecode/CodeBlock.h:

ScriptExecutable* ownerScriptExecutable() const { return jsCast&lt;ScriptExecutable*&gt;(m_ownerExecutable.get()); }

with jsCast implemented here, showing the JSC::JSCell::inherits call 

runtime/JSCell.h:

template&lt;typename To, typename From&gt;

inline To jsCast(From* from)

{

    ASSERT_WITH_SECURITY_IMPLICATION(!from || from-&gt;JSCell::inherits(std::remove_pointer&lt;To&gt;::type::info()));

    return static_cast&lt;To&gt;(from);

}

If asserts are disabled and SECURITY_ASSERTIONS are disabled, ASSERT_WITH_SECURITY_IMPLICATION is a no-op, and this could go unnoticed, but if the assertions are enabled, the build fails because JSCell.cpp does not implement JSC::JSCell::inherits(JSC::ClassInfo const*) const.</pre>

        </div>

      </p>

      <hr>

      <span>You are receiving this mail because:</span>

      <ul>

          <li>You are the assignee for the bug.</li>

      </ul>

    </body>

</html>