test_throwing_method_noDCE.html

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<!DOCTYPE html>

<meta charset=utf-8>

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

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

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

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

<script>

/* global test, assert_true */

test(function() {

  function test(root) {

    var threw = false;

    try {

        root.querySelectorAll("");

    } catch (e) { threw = true; }

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

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

    // of ion compilation).

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

      // empty

    return threw;

  var threw = false;

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

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

      threw = test(el);

  assert_true(threw);

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

</script>