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    <body><span class="vcard"><a class="email" href="mailto:fpizlo&#64;apple.com" title="Filip Pizlo &lt;fpizlo&#64;apple.com&gt;"> <span class="fn">Filip Pizlo</span></a>
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              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Implement ES6 arrow function syntax. Arrow function specific features. Lexical bind of this"
   href="https://bugs.webkit.org/show_bug.cgi?id=144956">bug 144956</a>
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            <th>What</th>
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           <td style="text-align:right;">Attachment #258823 Flags</td>
           <td>review?, commit-queue?
           </td>
           <td>review+, commit-queue-
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Implement ES6 arrow function syntax. Arrow function specific features. Lexical bind of this"
   href="https://bugs.webkit.org/show_bug.cgi?id=144956#c122">Comment # 122</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Implement ES6 arrow function syntax. Arrow function specific features. Lexical bind of this"
   href="https://bugs.webkit.org/show_bug.cgi?id=144956">bug 144956</a>
              from <span class="vcard"><a class="email" href="mailto:fpizlo&#64;apple.com" title="Filip Pizlo &lt;fpizlo&#64;apple.com&gt;"> <span class="fn">Filip Pizlo</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=258823&amp;action=diff" name="attach_258823" title="Patch">attachment 258823</a> <a href="attachment.cgi?id=258823&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=258823&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=258823&amp;action=review</a>

I'll cq+ if you make the two suggested changes.

<span class="quote">&gt; Source/JavaScriptCore/dfg/DFGMayExit.cpp:111
&gt; +    case LoadArrowFunctionThis:</span >

This sort of can exit.  It speculates that its child is a cell.

<span class="quote">&gt; Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:3115
&gt; +        LBasicBlock slowPath = isArrowFunction
&gt; +            ? FTL_NEW_BLOCK(m_out, (&quot;NewArrowFunction slow path&quot;))
&gt; +            : FTL_NEW_BLOCK(m_out, (&quot;NewFunction slow path&quot;));</span >

Just call it NewFunction.  No need for these branches just to get a different basic block name.

<span class="quote">&gt; Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:3119
&gt; -        LBasicBlock slowPath = FTL_NEW_BLOCK(m_out, (&quot;NewFunction slow path&quot;));
&gt; -        LBasicBlock continuation = FTL_NEW_BLOCK(m_out, (&quot;NewFunction continuation&quot;));
&gt; +        LBasicBlock continuation = isArrowFunction
&gt; +            ? FTL_NEW_BLOCK(m_out, (&quot;NewArrowFunction continuation&quot;))
&gt; +            : FTL_NEW_BLOCK(m_out, (&quot;NewFunction continuation&quot;));</span >

Ditto.

<span class="quote">&gt; Source/JavaScriptCore/runtime/JSArrowFunction.h:92
&gt; +friend class LLIntOffsetsExtractor;</span >

Indent this line.</pre>
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