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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ES6] Support Reflect.construct"
href="https://bugs.webkit.org/show_bug.cgi?id=147330">147330</a>
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<th>Summary</th>
<td>[ES6] Support Reflect.construct
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>528+ (Nightly build)
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>utatane.tea@gmail.com
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<p>
<div>
<pre>Reflect.construct has the crazy part in the spec.
It can replace the `newTarget` dynamically.
Since the current JSC has an assumption that `newTarget` is fixed when the derived constructor is defined, it breaks this assumption.
For example,
Reflect.construct(function () { }, [], Map)
does not work (breaks in LLInt layer) because the byte code op_create_this assumes that the newTarget is always the JSFunction (not InternalFunction).
I think Reflect.construct is the only place where we can replace the newTarget dynamically.
So the easiest way to implement it is adding a special (slow) path to Reflect.construct.</pre>
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