third_party/WebKit/LayoutTests/fast/js/script-tests/with-scope-gc.js

   1 description(
   2 'Tests to make sure that dynamic scope objects are correctly protected from GC.  To pass we need to not crash.'
   3 );
   4
   5 function gc()
   6 {
   7     if (this.GCController)
   8         GCController.collectAll();
   9     else
  10         for (var i = 0; i < 10000; ++i) // Allocate a sufficient number of objects to force a GC.
  11             ({});
  12 }
  13
  14 (function() {
  15     try {
  16         // Immediate value for scope
  17         with(1) { gc(); a; }
  18     } catch(e) {
  19     }
  20 })();
  21
  22 (function() {
  23     try {
  24         // Real object for scope
  25         var local;
  26         with (local = {}) {
  27             z=null;
  28             {}; {}; [1,2,3,4*{}]; // Clobber any temporaries the scope may exist in
  29             gc();
  30             b;
  31         }
  32     } catch (e) {
  33     }
  34 })();
  35
  36 (function() {
  37     try {
  38         // Test catch blocks for the heck of it
  39         try {
  40             throw 1;
  41         } catch(e) {
  42             gc();
  43             b;
  44         }
  45     } catch (e) {
  46     }
  47 })();