The Tor Browser: dom/bindings/test/test_throwing_method

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 <!DOCTYPE html>

     2 <meta charset=utf-8>

     3 <title>Test that we don't DCE functions that can throw</title>

     4 <script src="/resources/testharness.js"></script>

     5 <script src="/resources/testharnessreport.js"></script>

     6 <div id="log"></div>

     7 <script>

     8 test(function() {

     9   function test(root) {

    10     var threw = false;

    11     try {

    12         root.querySelectorAll("");

    13     } catch(e){ threw = true; };

    14     // Hot loop to make sure the JIT heuristics ion-compile this function even

    15     // though it's throwing exceptions (which would normally make us back off

    16     // of ion compilation).

    17     for (var i=0; i<1500; i++) {}

    18     return threw;

    19   }

    21   var threw = false;

    22   var el = document.createElement("div");

    23   for (var i=0; i<200; i++)

    24       threw = test(el);

    25   assert_true(threw);

    26 }, "Shouldn't optimize away throwing functions");

    27 </script>

The Tor Browser / file revision