The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/tests/js1_5/GC/regress-324278.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,63 @@
     1.4 +// |reftest| skip -- slow, obsoleted by 98409 fix
     1.5 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
     1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.9 +
    1.10 +//-----------------------------------------------------------------------------
    1.11 +var BUGNUMBER = 324278;
    1.12 +var summary = 'GC without recursion';
    1.13 +var actual = 'No Crash';
    1.14 +var expect = 'No Crash';
    1.15 +
    1.16 +printBugNumber(BUGNUMBER);
    1.17 +printStatus (summary);
    1.18 +
    1.19 +// Number to push native stack size beyond 10MB if GC recurses generating
    1.20 +// segfault on Fedora Core / Ubuntu Linuxes where the stack size by default
    1.21 +// is 10MB/8MB.
    1.22 +var N = 100*1000;
    1.23 +
    1.24 +function build(N) {
    1.25 +  // Exploit the fact that (in ES3), regexp literals are shared between
    1.26 +  // function invocations. Thus we build the following chain:
    1.27 +  // chainTop: function->regexp->function->regexp....->null
    1.28 +  // to check how GC would deal with this chain.
    1.29 +
    1.30 +  var chainTop = null;
    1.31 +  for (var i = 0; i != N; ++i) {
    1.32 +    var f = Function('some_arg'+i, ' return /test/;');
    1.33 +    var re = f();
    1.34 +    re.previous = chainTop;
    1.35 +    chainTop = f;
    1.36 +  }
    1.37 +  return chainTop;
    1.38 +}
    1.39 +
    1.40 +function check(chainTop, N) {
    1.41 +  for (var i = 0; i != N; ++i) {
    1.42 +    var re = chainTop();
    1.43 +    chainTop = re.previous;
    1.44 +  }
    1.45 +  if (chainTop !== null)
    1.46 +    throw "Bad chainTop";
    1.47 +
    1.48 +}
    1.49 +
    1.50 +if (typeof gc != "function") {
    1.51 +  gc = function() {
    1.52 +    for (var i = 0; i != 50*1000; ++i) {
    1.53 +      var tmp = new Object();
    1.54 +    }
    1.55 +  }
    1.56 +}
    1.57 +
    1.58 +var chainTop = build(N);
    1.59 +printStatus("BUILT");
    1.60 +gc();
    1.61 +check(chainTop, N);
    1.62 +printStatus("CHECKED");
    1.63 +chainTop = null;
    1.64 +gc();
    1.65 + 
    1.66 +reportCompare(expect, actual, summary);