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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Web Inspector: Native frames when refreshing page during timeline recording even though frames aren't native"
href="https://bugs.webkit.org/show_bug.cgi?id=158413">158413</a>
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<th>Summary</th>
<td>Web Inspector: Native frames when refreshing page during timeline recording even though frames aren't native
</td>
</tr>
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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>WebKit Local Build
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>Web Inspector
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
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<th>Reporter</th>
<td>sbarati@apple.com
</td>
</tr>
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<th>CC</th>
<td>bburg@apple.com, graouts@webkit.org, joepeck@webkit.org, mattbaker@apple.com, nvasilyev@apple.com, timothy@apple.com, webkit-bug-importer@group.apple.com
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<p>
<div>
<pre>Consider this program:
```
var shouldComputeSin = false;
var shouldComputeCos = true;
function computeSin(obj, x) {
if (shouldComputeSin)
obj.sin = Math.sin(x);
}
function computeCos(obj, x) {
if (shouldComputeCos)
obj.sin = Math.cos(x);
}
function computeResults(x) {
var obj = {};
computeSin(obj, x);
computeCos(obj, x);
}
for (var i = 0; i < 1000000; i++) {
computeResults(i);
}
```
Put that in a <script> inside a page. Open Web Inspector. Record a timeline.
Refresh the page 10 times. The call tree will have 10 duplicates at the same
tree representing the above program. If you select that last of the 10 refreshes,
only that tree has frames that aren't native frames. The first 9 all have native frames
for all their frames even though they are all user defined functions/programs.
(Feel free to replace 10 with another number: Anything > 2).</pre>
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</p>
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