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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - We should treat structures that vary solely in their prototype as a single polymorphic type."
href="https://bugs.webkit.org/show_bug.cgi?id=150983">150983</a>
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<th>Summary</th>
<td>We should treat structures that vary solely in their prototype as a single polymorphic type.
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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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>keith_miller@apple.com
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<pre>Consider the following code:
function foo()
function Bar(x) {
this.x = x;
}
return new Bar(1);
}
Every time foo() is called the returned value will have a different prototype. At some point, probably the second time we construct a new Bar() we should convert the structure into a new one that instead indicates we should get the prototype off the object itself rather than off the structure. This would prevent inline caches from becoming megamorphic.</pre>
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