michael@0: /**
michael@0:  * Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/publicdomain/zero/1.0/
michael@0:  */
michael@0: 
michael@0: // This function should never run on a too much recursion error.
michael@0: onerror = function(event) {
michael@0:   postMessage(event.message);
michael@0: };
michael@0: 
michael@0: // Pure JS recursion
michael@0: function recurse() {
michael@0:   recurse();
michael@0: }
michael@0: 
michael@0: // JS -> C++ -> JS -> C++ recursion
michael@0: function recurse2() {
michael@0:   var xhr = new XMLHttpRequest();
michael@0:   xhr.onreadystatechange = function() {
michael@0:     xhr.open("GET", "nonexistent.file");
michael@0:   }
michael@0:   xhr.open("GET", "nonexistent.file");
michael@0: }
michael@0: 
michael@0: var messageCount = 0;
michael@0: onmessage = function(event) {
michael@0:   switch (++messageCount) {
michael@0:     case 2:
michael@0:       recurse2();
michael@0: 
michael@0:       // An exception thrown from an event handler like xhr.onreadystatechange
michael@0:       // should not leave an exception pending in the code that generated the
michael@0:       // event.
michael@0:       postMessage("Done");
michael@0:       return;
michael@0: 
michael@0:     case 1:
michael@0:       recurse();
michael@0:       throw "Exception should have prevented us from getting here!";
michael@0: 
michael@0:     default:
michael@0:       throw "Weird number of messages: " + messageCount;
michael@0:   }
michael@0: 
michael@0:   throw "Impossible to get here!";
michael@0: }