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comparison: js/xpconnect/tests/chrome/test_bug732665.xul
js/xpconnect/tests/chrome/test_bug732665.xul
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| -1:000000000000 | 0:0fafb1cf4153 |
|---|---|
| 1 <?xml version="1.0"?> | |
| 2 <?xml-stylesheet type="text/css" href="chrome://global/skin"?> | |
| 3 <?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?> | |
| 4 <!-- | |
| 5 https://bugzilla.mozilla.org/show_bug.cgi?id=732665 | |
| 6 --> | |
| 7 <window title="Mozilla Bug 732665" | |
| 8 xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> | |
| 9 <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/> | |
| 10 | |
| 11 <!-- test results are displayed in the html:body --> | |
| 12 <body xmlns="http://www.w3.org/1999/xhtml"> | |
| 13 <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=732665" | |
| 14 target="_blank">Mozilla Bug 732665</a> | |
| 15 </body> | |
| 16 | |
| 17 <!-- test code goes here --> | |
| 18 <script type="application/javascript"> | |
| 19 <![CDATA[ | |
| 20 | |
| 21 // | |
| 22 // Important! If this test starts failing after a tricky platform-y change, | |
| 23 // the stack quota numbers in XPCJSRuntime probably need twiddling. We want | |
| 24 // to maintain the invariants in this test (at least to some approximation) | |
| 25 // for security reasons. | |
| 26 // | |
| 27 | |
| 28 // Executes f() d steps from the probed native stack limit, and returns | |
| 29 // the number of steps to the recursion limit from the caller. | |
| 30 function nearNativeStackLimit(d, f) { | |
| 31 f = f || function() {}; | |
| 32 function inner() { | |
| 33 try { | |
| 34 with ({}) { // keep things predictable -- stay in the interpreter | |
| 35 var stepsFromLimit = eval("inner()"); // Use eval to force a number of native stackframes to be created. | |
| 36 } | |
| 37 if (stepsFromLimit == d) { | |
| 38 try { f(); } catch(e) { ok(false, 'nearNativeStackLimit callback threw: ' + e); } | |
| 39 } | |
| 40 return stepsFromLimit + 1; | |
| 41 } catch(e) { | |
| 42 // It would be nice to check here that the exception is actually an | |
| 43 // over-recursion here. But doing so would require toString()ing the | |
| 44 // exception, which we may not have the stack space to do. | |
| 45 return 0; | |
| 46 } | |
| 47 } | |
| 48 return inner(); | |
| 49 } | |
| 50 | |
| 51 const Cu = Components.utils; | |
| 52 var contentSb = new Cu.Sandbox('http://www.example.com'); | |
| 53 var chromeSb = new Cu.Sandbox(window); | |
| 54 chromeSb.ok = contentSb.ok = ok; | |
| 55 Cu.evalInSandbox(nearNativeStackLimit.toSource(), chromeSb); | |
| 56 Cu.evalInSandbox(nearNativeStackLimit.toSource(), contentSb); | |
| 57 var chromeLimit = Cu.evalInSandbox("nearNativeStackLimit(0);", chromeSb); | |
| 58 var contentLimit = Cu.evalInSandbox("nearNativeStackLimit(0)", contentSb); | |
| 59 ok(chromeLimit >= contentLimit + 10, | |
| 60 "Chrome should be able to have at least 10 heavy frames more stack than content: " + chromeLimit + ", " + contentLimit); | |
| 61 | |
| 62 // Exhaust the stack space in content, and then make sure we can still get 10 | |
| 63 // heavy frames in chrome. | |
| 64 // | |
| 65 // Note that sometimes, if we pass |0| to nearNativeStackLimit, we can end up | |
| 66 // so close to the border in content that we can't even get ourselves together | |
| 67 // enough to make the cross-compartment call. So rather than exhausting the | |
| 68 // stack entirely and then checking for 10 chrome frames, we leave ourselves | |
| 69 // one frame's worth, and check for 11. | |
| 70 contentSb.nnslChrome = chromeSb.nearNativeStackLimit; | |
| 71 var nestedLimit = Cu.evalInSandbox("nearNativeStackLimit(1, function() { nestedLimit = nnslChrome(0);}); nestedLimit;", contentSb); | |
| 72 ok(nestedLimit >= 11, "Chrome should be invokable from content script with an exhausted stack: " + nestedLimit); | |
| 73 | |
| 74 ]]> | |
| 75 </script> | |
| 76 </window> |
