dom/bindings/test/test_throwing_method_noDCE.html

   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 /* global test, assert_true */
   9 test(function() {
  10   function test(root) {
  11     var threw = false;
  12     try {
  13         root.querySelectorAll("");
  14     } catch (e) { threw = true; }
  15     // Hot loop to make sure the JIT heuristics ion-compile this function even
  16     // though it's throwing exceptions (which would normally make us back off
  17     // of ion compilation).
  18     for (var i = 0; i < 1500; i++) {
  19       // empty
  20     }
  21     return threw;
  22   }
  23
  24   var threw = false;
  25   var el = document.createElement("div");
  26   for (var i = 0; i < 200; i++)
  27       threw = test(el);
  28   assert_true(threw);
  29 }, "Shouldn't optimize away throwing functions");
  30 </script>