LayoutTests/plugins/refcount-leaks.html

<head>
<script src="../resources/js-test-pre.js"></script>
</head>

<script>
function noop(x) {
}

function doGC() {
    // GC twice to make sure everything is cleaned up.
    for (var i = 0; i < 2; i++) {
        gc();
    }
}

var countOrig;
var countAfterCreate;
var countAfterGC;
var testObj;
var refOrig;
var refAfterGet;
var refAfterGetGC;
var refBeforePass;
var refAfterPass;
var refAfterPassAndGC;

function runtest() {
    if (window.testRunner)
        testRunner.dumpAsText();

    // Test that objects are deleted after their JS references are released.
    countOrig = plug.testObjectCount;
    let x;
    for (let i = 0; i < 50; ++i)
        x = plug.testCreateTestObject();
    countAfterCreate = plug.testObjectCount;
    x = null;
    doGC();
    countAfterGC = plug.testObjectCount;
    shouldBe('countAfterCreate === countOrig + 50', 'true');
    shouldBe('countAfterGC < countAfterCreate', 'true');

    // Test that the object refcount returns to normal after JS references
    // are released.
    testObj = plug.testObject;
    refOrig = testObj.refCount;
    for (let i = 0; i < 50; ++i)
        plug.testObject;
    refAfterGet = testObj.refCount;
    doGC();
    refAfterGetGC = testObj.refCount;
    shouldBe('refAfterGet === refOrig + 50', 'true');
    shouldBe('refAfterGetGC < refAfterGet', 'true');

    // Test that calling NPN_Invoke with our object as a parameter returns
    // our refcount to normal (may require a GC).
    refBeforePass = testObj.refCount;
    for (let i = 0; i < 50; ++i)
        plug.testPassTestObject("noop", testObj);
    refAfterPass = testObj.refCount;
    doGC();
    refAfterPassAndGC = testObj.refCount;
    shouldBe('refAfterPass === refBeforePass + 50', 'true');
    shouldBe('refAfterPassAndGC < refAfterPass', 'true');
}
</script>

<body onload="runtest()">

    Test that we can get an NPObject returned through a method on
    an NPAPI Object.<P>

    <embed name="plug" type="application/x-webkit-test-netscape">
</body>