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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement @isConstructor bytecode intrinsic and bytecode for that"
href="https://bugs.webkit.org/show_bug.cgi?id=144093">144093</a>
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<th>Summary</th>
<td>Implement @isConstructor bytecode intrinsic and bytecode for that
</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)
</td>
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<th>Hardware</th>
<td>Unspecified
</td>
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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
</td>
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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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<pre>Currently, `typeof XXX === "function"` is used (in Array.from)
However, it's not accuate to the spec. According to the spec, this should be queried by `isConstructor` abstract operation.
While `isConstructor` queries the given object has `[[Construct]]`, `typeof thisObj === "function"` queries the given object has `[[Call]]`.
To fix that, we introduce a new bytecode op_is_constructor and use it with bytecode intrinsic @isConstructor.</pre>
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