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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - We should only expect a RareCaseProfile to exist if the rare case actually exists"
href="https://bugs.webkit.org/show_bug.cgi?id=149531">149531</a>
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<th>Summary</th>
<td>We should only expect a RareCaseProfile to exist if the rare case actually exists
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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 Local 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>mark.lam@apple.com
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<pre>The current code that calls rareCaseProfileForBytecodeOffset() always assumes that it will always return a non-null RareCaseProfile. As a result, op_add in the baseline JIT is forced to add a dummy slow case that will never be taken, only to ensure that the RareCaseProfile for that bytecode is created, and it will always produce a counter value of 0 (since that path will never be taken). Instead, we'll make the callers of rareCaseProfileForBytecodeOffset() check if the profile actually exist before dereferencing it.</pre>
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