1 files changed, 47 insertions, 0 deletions
diff --git a/dom/workers/test/recursion_worker.js b/dom/workers/test/recursion_worker.js
new file mode 100644
index 0000000000..84eb6d9740
--- /dev/null
+++ b/dom/workers/test/recursion_worker.js
@@ -0,0 +1,47 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// This function should never run on a too much recursion error.
+onerror = function (event) {
+  postMessage(event.message);
+};
+
+// Pure JS recursion
+function recurse() {
+  recurse();
+}
+
+// JS -> C++ -> JS -> C++ recursion
+function recurse2() {
+  var xhr = new XMLHttpRequest();
+  xhr.onreadystatechange = function () {
+    xhr.open("GET", "nonexistent.file");
+  };
+  xhr.open("GET", "nonexistent.file");
+}
+
+var messageCount = 0;
+onmessage = function (event) {
+  switch (++messageCount) {
+    case 2:
+      recurse2();
+
+      // An exception thrown from an event handler like xhr.onreadystatechange
+      // should not leave an exception pending in the code that generated the
+      // event.
+      postMessage("Done");
+      return;
+
+    case 1:
+      recurse();
+      throw "Exception should have prevented us from getting here!";
+
+    default:
+      throw "Weird number of messages: " + messageCount;
+  }
+
+  // eslint-disable-next-line no-unreachable
+  throw "Impossible to get here!";
+};