tests/mozilla/js1_5/Regress/regress-192465.js

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  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) 2003
  18 * the Initial Developer. All Rights Reserved.
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  20 * Contributor(s): igor@icesoft.com, pschwartau@netscape.com
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  35 *
  36 *
  37 * Date:    10 February 2003
  38 * SUMMARY: Object.toSource() recursion should check stack overflow
  39 *
  40 * See http://bugzilla.mozilla.org/show_bug.cgi?id=192465
  41 *
  42 * MODIFIED: 27 February 2003
  43 *
  44 * We are adding an early return to this testcase, since it is causing
  45 * big problems on Linux RedHat8! For a discussion of this issue, see
  46 * http://bugzilla.mozilla.org/show_bug.cgi?id=174341#c24 and following.
  47 *
  48 *
  49 * MODIFIED: 20 March 2003
  50 *
  51 * Removed the early return and changed |N| below from 1000 to 90.
  52 * Note |make_deep_nest(N)| returns an object graph of length N(N+1).
  53 * So the graph has now been reduced from 1,001,000 to 8190.
  54 *
  55 * With this reduction, the bug still manifests on my WinNT and Linux
  56 * boxes (crash due to stack overflow). So the testcase is again of use
  57 * on those boxes. At the same time, Linux RedHat8 boxes can now run
  58 * the test in a reasonable amount of time.
  59 */
  60 //-----------------------------------------------------------------------------
  61 var UBound = 0;
  62 var bug = 192465;
  63 var summary = 'Object.toSource() recursion should check stack overflow';
  64 var status = '';
  65 var statusitems = [];
  66 var actual = '';
  67 var actualvalues = [];
  68 var expect= '';
  69 var expectedvalues = [];
  70
  71
  72 /*
  73  * We're just testing that this script will compile and run.
  74  * Set both |actual| and |expect| to a dummy value.
  75  */
  76 status = inSection(1);
  77 var N = 90;
  78 try
  79 {
  80   make_deep_nest(N);
  81 }
  82 catch (e)
  83 {
  84   // An exception is OK, as the runtime can throw one in response to too deep
  85   // recursion. We haven't crashed; good! Continue on to set the dummy values -
  86 }
  87 actual = 1;
  88 expect = 1;
  89 addThis();
  90
  91
  92
  93 //-----------------------------------------------------------------------------
  94 test();
  95 //-----------------------------------------------------------------------------
  96
  97
  98 /*
  99  * EXAMPLE:
 100  *
 101  * If the global variable |N| is 2, then for |level| == 0, 1, 2, the return
 102  * value of this function will be toSource() of these objects, respectively:
 103  *
 104  * {next:{next:END}}
 105  * {next:{next:{next:{next:END}}}}
 106  * {next:{next:{next:{next:{next:{next:END}}}}}}
 107  *
 108  */
 109 function make_deep_nest(level)
 110 {
 111   var head = {};
 112   var cursor = head;
 113
 114   for (var i=0; i!=N; ++i)
 115   {
 116     cursor.next = {};
 117     cursor = cursor.next;
 118   }
 119
 120   cursor.toSource = function()
 121   {
 122     if (level != 0)
 123       return make_deep_nest(level - 1);
 124     return "END";
 125   }
 126
 127   return head.toSource();
 128 }
 129
 130
 131 function addThis()
 132 {
 133   statusitems[UBound] = status;
 134   actualvalues[UBound] = actual;
 135   expectedvalues[UBound] = expect;
 136   UBound++;
 137 }
 138
 139
 140 function test()
 141 {
 142   enterFunc('test');
 143   printBugNumber(bug);
 144   printStatus(summary);
 145
 146   for (var i=0; i<UBound; i++)
 147   {
 148     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
 149   }
 150
 151   exitFunc ('test');
 152 }