2013-08-28 11:04:16 -07:00
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<?xml version="1.0"?>
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<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
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<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=732665
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-->
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<window title="Mozilla Bug 732665"
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xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
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<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
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<!-- test results are displayed in the html:body -->
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<body xmlns="http://www.w3.org/1999/xhtml">
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<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=732665"
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target="_blank">Mozilla Bug 732665</a>
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</body>
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<!-- test code goes here -->
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<script type="application/javascript">
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<![CDATA[
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//
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// Important! If this test starts failing after a tricky platform-y change,
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// the stack quota numbers in XPCJSRuntime probably need twiddling. We want
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// to maintain the invariants in this test (at least to some approximation)
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// for security reasons.
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//
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// Executes f() d steps from the probed native stack limit, and returns
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// the number of steps to the recursion limit from the caller.
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function nearNativeStackLimit(d, f) {
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f = f || function() {};
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function inner() {
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try {
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with ({}) { // keep things predictable -- stay in the interpreter
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var stepsFromLimit = eval("inner()"); // Use eval to force a number of native stackframes to be created.
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}
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if (stepsFromLimit == d) {
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try { f(); } catch(e) { ok(false, 'nearNativeStackLimit callback threw: ' + e); }
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}
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return stepsFromLimit + 1;
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} catch(e) {
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// It would be nice to check here that the exception is actually an
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// over-recursion here. But doing so would require toString()ing the
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// exception, which we may not have the stack space to do.
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return 0;
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}
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}
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return inner();
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}
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const Cu = Components.utils;
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var contentSb = new Cu.Sandbox('http://www.example.com');
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var chromeSb = new Cu.Sandbox(window);
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chromeSb.ok = contentSb.ok = ok;
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Cu.evalInSandbox(nearNativeStackLimit.toSource(), chromeSb);
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Cu.evalInSandbox(nearNativeStackLimit.toSource(), contentSb);
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var chromeLimit = Cu.evalInSandbox("nearNativeStackLimit(0);", chromeSb);
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var contentLimit = Cu.evalInSandbox("nearNativeStackLimit(0)", contentSb);
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ok(chromeLimit >= contentLimit + 10,
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"Chrome should be able to have at least 10 heavy frames more stack than content: " + chromeLimit + ", " + contentLimit);
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2013-09-11 15:24:09 -07:00
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// Exhaust the stack space in content, and then make sure we can still get 10
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// heavy frames in chrome.
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//
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// Note that sometimes, if we pass |0| to nearNativeStackLimit, we can end up
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// so close to the border in content that we can't even get ourselves together
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// enough to make the cross-compartment call. So rather than exhausting the
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// stack entirely and then checking for 10 chrome frames, we leave ourselves
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// one frame's worth, and check for 11.
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2013-08-28 11:04:16 -07:00
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contentSb.nnslChrome = chromeSb.nearNativeStackLimit;
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2013-09-11 15:24:09 -07:00
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var nestedLimit = Cu.evalInSandbox("nearNativeStackLimit(1, function() { nestedLimit = nnslChrome(0);}); nestedLimit;", contentSb);
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ok(nestedLimit >= 11, "Chrome should be invokable from content script with an exhausted stack: " + nestedLimit);
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2013-08-28 11:04:16 -07:00
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]]>
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</script>
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</window>
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