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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/170432">170432</a></dd>
<dt>Author</dt> <dd>msaboff@apple.com</dd>
<dt>Date</dt> <dd>2014-06-25 10:34:52 -0700 (Wed, 25 Jun 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Provide javascript aware backtrace script for lldb
https://bugs.webkit.org/show_bug.cgi?id=134276
Reviewed by Jer Noble.
* lldb/lldb_webkit.py:
(__lldb_init_module):
(btjs): New scripted command to display a backtrace that shows JavaScript frames with details.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkToolsChangeLog">trunk/Tools/ChangeLog</a></li>
<li><a href="#trunkToolslldblldb_webkitpy">trunk/Tools/lldb/lldb_webkit.py</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkToolsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Tools/ChangeLog (170431 => 170432)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/ChangeLog 2014-06-25 17:24:28 UTC (rev 170431)
+++ trunk/Tools/ChangeLog 2014-06-25 17:34:52 UTC (rev 170432)
</span><span class="lines">@@ -1,3 +1,14 @@
</span><ins>+2014-06-25 Michael Saboff <msaboff@apple.com>
+
+ Provide javascript aware backtrace script for lldb
+ https://bugs.webkit.org/show_bug.cgi?id=134276
+
+ Reviewed by Jer Noble.
+
+ * lldb/lldb_webkit.py:
+ (__lldb_init_module):
+ (btjs): New scripted command to display a backtrace that shows JavaScript frames with details.
+
</ins><span class="cx"> 2014-06-25 Michał Pakuła vel Rutka <m.pakula@samsung.com>
</span><span class="cx">
</span><span class="cx"> REGRESSION (r170426) Broke two python tests
</span></span></pre></div>
<a id="trunkToolslldblldb_webkitpy"></a>
<div class="modfile"><h4>Modified: trunk/Tools/lldb/lldb_webkit.py (170431 => 170432)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/lldb/lldb_webkit.py 2014-06-25 17:24:28 UTC (rev 170431)
+++ trunk/Tools/lldb/lldb_webkit.py 2014-06-25 17:34:52 UTC (rev 170432)
</span><span class="lines">@@ -30,9 +30,11 @@
</span><span class="cx"> """
</span><span class="cx">
</span><span class="cx"> import lldb
</span><ins>+import string
</ins><span class="cx"> import struct
</span><span class="cx">
</span><span class="cx"> def __lldb_init_module(debugger, dict):
</span><ins>+ debugger.HandleCommand('command script add -f lldb_webkit.btjs btjs')
</ins><span class="cx"> debugger.HandleCommand('type summary add --expand -F lldb_webkit.WTFString_SummaryProvider WTF::String')
</span><span class="cx"> debugger.HandleCommand('type summary add --expand -F lldb_webkit.WTFStringImpl_SummaryProvider WTF::StringImpl')
</span><span class="cx"> debugger.HandleCommand('type summary add --expand -F lldb_webkit.WTFAtomicString_SummaryProvider WTF::AtomicString')
</span><span class="lines">@@ -96,6 +98,43 @@
</span><span class="cx"> provider = WebCoreLayoutPointProvider(valobj, dict)
</span><span class="cx"> return "{ x = %s, y = %s }" % (provider.get_x(), provider.get_y())
</span><span class="cx">
</span><ins>+
+def btjs(debugger, command, result, internal_dict):
+ '''Prints a stack trace of current thread with JavaScript frames decoded. Takes optional frame count argument'''
+
+ target = debugger.GetSelectedTarget()
+ addressFormat = '#0{width}x'.format(width=target.GetAddressByteSize() * 2 + 2)
+ process = target.GetProcess()
+ thread = process.GetSelectedThread()
+
+ backtraceDepth = thread.GetNumFrames()
+
+ if len(command) == 1:
+ try:
+ backtraceDepth = int(command)
+ except ValueError:
+ return
+
+ threadFormat = '* thread #{num}: tid = {tid:#x}, {pcAddr:' + addressFormat + '}, queue = \'{queueName}, stop reason = {stopReason}'
+ print threadFormat.format(num=thread.GetIndexID(), tid=thread.GetThreadID(), pcAddr=thread.GetFrameAtIndex(0).GetPC(), queueName=thread.GetQueueName(), stopReason=thread.GetStopDescription(30))
+
+ for frame in thread:
+ if backtraceDepth < 1:
+ break
+
+ backtraceDepth = backtraceDepth - 1
+
+ function = frame.GetFunction()
+
+ if not frame or not frame.GetSymbol() or frame.GetSymbol().GetName() == "llint_entry":
+ callFrame = frame.GetSP()
+ JSFrameDescription = frame.EvaluateExpression("((JSC::CallFrame*)0x%x)->describeFrame()" % frame.GetFP()).GetSummary()
+ JSFrameDescription = string.strip(JSFrameDescription, '"')
+ frameFormat = ' frame #{num}: {addr:' + addressFormat + '} {desc}'
+ print frameFormat.format(num=frame.GetFrameID(), addr=frame.GetPC(), desc=JSFrameDescription)
+ else:
+ print ' %s' % frame
+
</ins><span class="cx"> # FIXME: Provide support for the following types:
</span><span class="cx"> # def WTFVector_SummaryProvider(valobj, dict):
</span><span class="cx"> # def WTFCString_SummaryProvider(valobj, dict):
</span></span></pre>
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