third_party/WebKit/LayoutTests/storage/indexeddb/request-leak.html

   1 <!DOCTYPE html>
   2 <script src="../../resources/js-test.js"></script>
   3 <script src="resources/shared.js"></script>
   4 <script>
   5
   6 description("Verify that that requests weakly hold script value properties");
   7
   8 if (window.internals) {
   9     indexedDBTest(prepareDatabase, onOpen);
  10 } else {
  11     testFailed('This test requires access to the Internals object');
  12     finishJSTest();
  13 }
  14
  15 function prepareDatabase(evt)
  16 {
  17     preamble(evt);
  18     evalAndLog("db = event.target.result");
  19     evalAndLog("store = db.createObjectStore('store')");
  20     evalAndLog("store.put({value: 'value'}, 'key')");
  21 }
  22
  23 function onOpen(evt)
  24 {
  25     preamble(evt);
  26     evalAndLog("db = event.target.result");
  27     evalAndLog("tx = db.transaction('store')");
  28     evalAndLog("store = tx.objectStore('store')");
  29     evalAndLog("request = store.get('key')");
  30     tx.oncomplete = function onTransactionComplete() {
  31         preamble();
  32         evalAndLog("db.close()");
  33         shouldBeEqualToString("typeof request.result", "object");
  34
  35         // Verify that the same object is returned on each access to request.result.
  36         evalAndLog("request.result.x = 123");
  37         shouldBe("request.result.x", "123");
  38
  39         // Try and induce a leak by a reference cycle from DOM to V8 and back.
  40         // If the v8 value of request.result (etc) is only held by the requests's
  41         // V8 wrapper then there will be no leak.
  42         evalAndLog("request.result.leak = request");
  43         evalAndLog("observer = internals.observeGC(request)");
  44         evalAndLog("request = null");
  45         evalAndLog("gc()");
  46         shouldBeTrue("observer.wasCollected");
  47         finishJSTest();
  48     };
  49 }
  50
  51
  52 </script>