dom/workers/test/recursion_worker.js@6474c204b198 (annotated)
dom/workers/test/recursion_worker.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /** |
| michael@0 | 2 | * Any copyright is dedicated to the Public Domain. |
| michael@0 | 3 | * http://creativecommons.org/publicdomain/zero/1.0/ |
| michael@0 | 4 | */ |
| michael@0 | 5 | |
| michael@0 | 6 | // This function should never run on a too much recursion error. |
| michael@0 | 7 | onerror = function(event) { |
| michael@0 | 8 | postMessage(event.message); |
| michael@0 | 9 | }; |
| michael@0 | 10 | |
| michael@0 | 11 | // Pure JS recursion |
| michael@0 | 12 | function recurse() { |
| michael@0 | 13 | recurse(); |
| michael@0 | 14 | } |
| michael@0 | 15 | |
| michael@0 | 16 | // JS -> C++ -> JS -> C++ recursion |
| michael@0 | 17 | function recurse2() { |
| michael@0 | 18 | var xhr = new XMLHttpRequest(); |
| michael@0 | 19 | xhr.onreadystatechange = function() { |
| michael@0 | 20 | xhr.open("GET", "nonexistent.file"); |
| michael@0 | 21 | } |
| michael@0 | 22 | xhr.open("GET", "nonexistent.file"); |
| michael@0 | 23 | } |
| michael@0 | 24 | |
| michael@0 | 25 | var messageCount = 0; |
| michael@0 | 26 | onmessage = function(event) { |
| michael@0 | 27 | switch (++messageCount) { |
| michael@0 | 28 | case 2: |
| michael@0 | 29 | recurse2(); |
| michael@0 | 30 | |
| michael@0 | 31 | // An exception thrown from an event handler like xhr.onreadystatechange |
| michael@0 | 32 | // should not leave an exception pending in the code that generated the |
| michael@0 | 33 | // event. |
| michael@0 | 34 | postMessage("Done"); |
| michael@0 | 35 | return; |
| michael@0 | 36 | |
| michael@0 | 37 | case 1: |
| michael@0 | 38 | recurse(); |
| michael@0 | 39 | throw "Exception should have prevented us from getting here!"; |
| michael@0 | 40 | |
| michael@0 | 41 | default: |
| michael@0 | 42 | throw "Weird number of messages: " + messageCount; |
| michael@0 | 43 | } |
| michael@0 | 44 | |
| michael@0 | 45 | throw "Impossible to get here!"; |
| michael@0 | 46 | } |
