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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [JSC] Default parameter part should be retrieved by op_get_argument opcode instead of changing parity"
href="https://bugs.webkit.org/show_bug.cgi?id=164582">164582</a>
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<th>Summary</th>
<td>[JSC] Default parameter part should be retrieved by op_get_argument opcode instead of changing parity
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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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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<pre>If you have a function like,
function func(a, b, options = {}) {
...
}
`func.length` is 2. But the number of parameters of this function is counted as 3.
So if you call it with the form `func(a, b)`, the arity check always fails.
But in the above case, not passing options is common.
Instead, we should retrieve the argument by using `op_get_argument`. It does not increase the arity.</pre>
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