tests/mozilla/js1_5/String/regress-179068.js

   1 /* ***** BEGIN LICENSE BLOCK *****
   2 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
   3 *
   4 * The contents of this file are subject to the Netscape Public License
   5 * Version 1.1 (the "License"); you may not use this file except in
   6 * compliance with the License. You may obtain a copy of the License at
   7 * http://www.mozilla.org/NPL/
   8 *
   9 * Software distributed under the License is distributed on an "AS IS" basis,
  10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11 * for the specific language governing rights and limitations under the
  12 * License.
  13 *
  14 * The Original Code is JavaScript Engine testing utilities.
  15 *
  16 * The Initial Developer of the Original Code is Netscape Communications Corp.
  17 * Portions created by the Initial Developer are Copyright (C) 2002
  18 * the Initial Developer. All Rights Reserved.
  19 *
  20 * Contributor(s): igor@icesoft.no, pschwartau@netscape.com
  21 *
  22 * Alternatively, the contents of this file may be used under the terms of
  23 * either the GNU General Public License Version 2 or later (the "GPL"), or
  24 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  25 * in which case the provisions of the GPL or the LGPL are applicable instead
  26 * of those above. If you wish to allow use of your version of this file only
  27 * under the terms of either the GPL or the LGPL, and not to allow others to
  28 * use your version of this file under the terms of the NPL, indicate your
  29 * decision by deleting the provisions above and replace them with the notice
  30 * and other provisions required by the GPL or the LGPL. If you do not delete
  31 * the provisions above, a recipient may use your version of this file under
  32 * the terms of any one of the NPL, the GPL or the LGPL.
  33 *
  34 * ***** END LICENSE BLOCK *****
  35 *
  36 *
  37 * Date:    09 November 2002
  38 * SUMMARY: Test that interpreter can handle string literals exceeding 64K
  39 * See http://bugzilla.mozilla.org/show_bug.cgi?id=179068
  40 *
  41 * Test that the interpreter can handle string literals exceeding 64K limit.
  42 * For that the script passes to eval() "str ='LONG_STRING_LITERAL';" where
  43 * LONG_STRING_LITERAL is a string with 200K chars.
  44 *
  45 * Igor Bukanov explains the technique used below:
  46 *
  47 * > Philip Schwartau wrote:
  48 * >...
  49 * > Here is the heart of the testcase:
  50 * >
  51 * >   // Generate 200K long string
  52 * >   var long_str = duplicate(LONG_STR_SEED, N);
  53 * >   var str = "";
  54 * >   eval("str='".concat(long_str, "';"));
  55 * >   var test_is_ok = (str.length == LONG_STR_SEED.length * N);
  56 * >
  57 * >
  58 * > The testcase creates two identical strings, |long_str| and |str|. It
  59 * > uses eval() simply to assign the value of |long_str| to |str|. Why is
  60 * > it necessary to have the variable |str|, then? Why not just create
  61 * > |long_str| and test it? Wouldn't this be enough:
  62 * >
  63 * >   // Generate 200K long string
  64 * >   var long_str = duplicate(LONG_STR_SEED, N);
  65 * >   var test_is_ok = (long_str.length == LONG_STR_SEED.length * N);
  66 * >
  67 * > Or do we specifically need to test eval() to exercise the interpreter?
  68 *
  69 * The reason for eval is to test string literals like in 'a string literal
  70 * with 100 000 characters...', Rhino deals fine with strings generated at
  71 * run time where lengths > 64K. Without eval it would be necessary to have
  72 * a test file excedding 64K which is not that polite for CVS and then a
  73 * special treatment for the compiled mode in Rhino should be added.
  74 *
  75 *
  76 * >
  77 * > If so, is it important to use the concat() method in the assignment, as
  78 * > you have done: |eval("str='".concat(long_str, "';"))|, or can we simply
  79 * > do |eval("str = long_str;")| ?
  80 *
  81 * The concat is a replacement for eval("str='"+long_str+"';"), but as
  82 * long_str is huge, this leads to constructing first a new string via
  83 * "str='"+long_str and then another one via ("str='"+long_str) + "';"
  84 * which takes time under JDK 1.1 on a something like StrongArm 200MHz.
  85 * Calling concat makes less copies, that is why it is used in the
  86 * duplicate function and this is faster then doing recursion like in the
  87 * test case to test that 64K different string literals can be handled.
  88 *
  89 */
  90 //-----------------------------------------------------------------------------
  91 var UBound = 0;
  92 var bug = 179068;
  93 var summary = 'Test that interpreter can handle string literals exceeding 64K';
  94 var status = '';
  95 var statusitems = [];
  96 var actual = '';
  97 var actualvalues = [];
  98 var expect= '';
  99 var expectedvalues = [];
 100 var LONG_STR_SEED = "0123456789";
 101 var N = 20 * 1024;
 102 var str = "";
 103
 104
 105 // Generate 200K long string and assign it to |str| via eval()
 106 var long_str = duplicate(LONG_STR_SEED, N);
 107 eval("str='".concat(long_str, "';"));
 108
 109 status = inSection(1);
 110 actual = str.length == LONG_STR_SEED.length * N
 111 expect = true;
 112 addThis();
 113
 114
 115
 116 //-----------------------------------------------------------------------------
 117 test();
 118 //-----------------------------------------------------------------------------
 119
 120
 121
 122 function duplicate(str, count)
 123 {
 124   var tmp = new Array(count);
 125
 126   while (count != 0)
 127     tmp[--count] = str;
 128
 129   return String.prototype.concat.apply("", tmp);
 130 }
 131
 132
 133 function addThis()
 134 {
 135   statusitems[UBound] = status;
 136   actualvalues[UBound] = actual;
 137   expectedvalues[UBound] = expect;
 138   UBound++;
 139 }
 140
 141
 142 function test()
 143 {
 144   enterFunc('test');
 145   printBugNumber(bug);
 146   printStatus(summary);
 147
 148   for (var i=0; i<UBound; i++)
 149   {
 150     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
 151   }
 152
 153   exitFunc ('test');
 154 }