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<!DOCTYPE html>
<html>
<!--
Copyright (c) 2012 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<head>
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="-1" />
<title>Logging and Stack Trace</title>
<script type="text/javascript">
statusText = 'NO-STATUS';
tick = '';
boomTime = null;
crashed = false;
// Handle a message coming from the NaCl module.
function handleMessage(message_event) {
msg_type = message_event.data.substring(0,4)
msg_data = message_event.data.substring(5, message_event.data.length)
if (msg_type == 'POP:') {
alert(message_event.data);
return
}
if (msg_type == 'LOG:') {
document.Logging.log.value += msg_data + '\n';
return
}
if (msg_type == 'TRC:') {
crashed = true;
updateStatus('Crash Reported')
xmlhttp = new XMLHttpRequest();
xmlhttp.open('POST',document.nacl_module.src,false);
xmlhttp.send(msg_data)
document.Logging.trace.value = xmlhttp.responseText + '\n';
return
}
}
function pageDidLoad() {
updateStatus("Page Loaded")
heartBeat();
updateStatus("Page Submitted")
}
// Indicate success when the NaCl module has loaded.
function moduleDidLoad() {
updateStatus('LOADED');
t=setTimeout('boom()', 4000);
}
// Set the global status message. If the element with id 'statusField'
// exists, then set its HTML to the status message as well.
// opt_message The message test. If this is null or undefined, then
// attempt to set the element with id 'statusField' to the value of
// |statusText|.
function updateStatus(opt_message) {
if (opt_message)
statusText = opt_message;
document.Logging.log.value += opt_message + '\n'
var statusField = document.getElementById('statusField');
if (statusField) {
statusField.innerHTML = statusText;
}
}
function boom() {
if (!crashed) {
updateStatus('Send BOOM');
document.nacl_module.postMessage('BOOM');
t=setTimeout('boom()', 1000);
}
}
function heartBeat() {
if (document.nacl_module.lastError) {
if (tick != document.nacl_module.lastError) {
tick = document.nacl_module.lastError;
updateStatus('Missed heartbeat: ' + document.nacl_module.lastError);
crashed = true;
}
}
else { t=setTimeout('heartBeat()', 1000); }
}
</script>
<form name="Status">
<input type="hidden" name="Data" value="">
</form>
</head>
<body onload="pageDidLoad()">
<h1>Native Client Getting Started: Debugging.</h1>
<p>This example shows how to trap an untrusted exception, and then send that
information to the webserver to generate a stack trace. This can only be used
for development since it requires several command-line switches, environment
variables and a special version of the plugin. The test works, by loading the
module and communicating with it through PostMessage. Messages from the module
are sent to the status line and/or the log window. Four seconds after loading,
the script will send a 'BOOM' message to the module which will cause it to
dereference an illegal location in memory.</p>
<p>If Chrome is launched correctly with the appropriate command-line arguments
and environment variables, the Log will show the crash dump facilities were
turn on and when the crash data arrives, it will be forwarded to the http server
which will drive the decoder and send a stack trace back to the web page.</p>
<p>If setup incorrectly, the page may or may not load. If it does, it will
send a "LOADED" message to the log and eventual will crash. The script will
detect this crash by detecting a missed heartbeat the the running application
would normal send, and then print the current module status.
</p>
<h2>Running the example</h2>
In one console window, to start the server:
<ul>
<li>Set CHROME_PATH to the fully qualified path.</li>
<li>From the example directory type: <b>make RUN</b></li>
</ul>
In another console window, to start Chrome:
<ul>
<li>Set CHROME_PATH to the fully qualified path.</li>
<li>From the example directory type: <b>make TRACE</b></li>
</ul>
<div id="listener">
<script type="text/javascript">
var listener = document.getElementById('listener')
listener.addEventListener('load', moduleDidLoad, true);
listener.addEventListener('message', handleMessage, true);
</script>
<embed name="nacl_module"
id="hello_world"
width=100 height=100
src="hello_world.nmf"
type="application/x-nacl" />
</div>
<h2>Status: <code id="statusField">NO-STATUS</code></h2>
<form name="Logging">
<h2>Log</h2>
<textarea rows="10" cols="130" name="log" readonly="readonly"></textarea>
<br />
<h2>Stack Trace</h2>
<textarea rows="10" cols="130" name="trace" readonly="readonly"></textarea>
</form>
</body>
</html>
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