regress-324278.js - mozsearch

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// |reftest| skip -- slow, obsoleted by 98409 fix

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//-----------------------------------------------------------------------------

var BUGNUMBER = 324278;

var summary = 'GC without recursion';

var actual = 'No Crash';

var expect = 'No Crash';

printBugNumber(BUGNUMBER);

printStatus (summary);

// Number to push native stack size beyond 10MB if GC recurses generating

// segfault on Fedora Core / Ubuntu Linuxes where the stack size by default

// is 10MB/8MB.

var N = 100*1000;

function build(N) {

  // Exploit the fact that (in ES3), regexp literals are shared between

  // function invocations. Thus we build the following chain:

  // chainTop: function->regexp->function->regexp....->null

  // to check how GC would deal with this chain.

  var chainTop = null;

  for (var i = 0; i != N; ++i) {

    var f = Function('some_arg'+i, ' return /test/;');

    var re = f();

    re.previous = chainTop;

    chainTop = f;

  return chainTop;

function check(chainTop, N) {

  for (var i = 0; i != N; ++i) {

    var re = chainTop();

    chainTop = re.previous;

  if (chainTop !== null)

    throw "Bad chainTop";

if (typeof gc != "function") {

  gc = function() {

    for (var i = 0; i != 50*1000; ++i) {

      var tmp = new Object();

var chainTop = build(N);

printStatus("BUILT");

gc();

check(chainTop, N);

printStatus("CHECKED");

chainTop = null;

gc();

reportCompare(expect, actual, summary);