author Ted Campbell <>
Sat, 18 Sep 2021 15:53:59 +0000
changeset 592430 9adcbf4e1bd9385a3128de0501859a3f144cf672
parent 569736 a8f556e08545131cea2a4fd0c5fea44104e131bd
permissions -rw-r--r--
Bug 1731434 - Fix handling of double-faults while throwing overrecursed r=arai The JSContext::generatingError re-entrancy check can generate uncatchable exceptions while throwing errors. Fix ReportOverRecursed to reflect this. Differential Revision:

<meta charset="utf-8">
  <iframe id="iframe"></iframe>

  <script type="text/javascript">
    "use strict";
    addEventListener("load", () => {
      // Send a heap-minimize observer notification so our script cache is
      // cleared, and our content script isn't available for synchronous
      // insertion.
      window.dispatchEvent(new CustomEvent("MozHeapMinimize"));

      let iframe = document.getElementById("iframe");
      let doc = iframe.contentDocument;
      let win = iframe.contentWindow;"text/html");
      // We need to do two writes here. The first creates the document element,
      // which normally triggers parser blocking. The second triggers the
      // creation of the element we're about to query for, which would normally
      // happen asynchronously if the parser were blocked.
      doc.write("<div id=meh>");
      doc.write("<div id=beer></div>");

      let elem = doc.getElementById("beer");
      top.postMessage(elem instanceof win.HTMLDivElement ? "ok" : "fail",

    }, {once: true});