1<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
2<html>
3<head>
4<script>
5
6function runArrayOOMTest() {
7    document.write("<p>Starting test...</p>");
8
9    // The index 'target' is the location in the array we expect to fault on access, should the size calculation of the realloc of the vector be allowed
10    // to overflow.  The vector needs to be ((target + 1) * sizeof(JSValue*)) bytes long to hold 'target', or approximately 2/3 UINT32_MAX.  Upon growing
11    // the array an additional 50% capacity will be allocated, plus the storage object header, taking the size of the allocation over UINT32_MAX.
12    var target = Math.floor(0xFFFFFFFF / 6);
13    // In order to force arr[target] to be stored in the vector, rather than the sparse map, we need ensure the vector is sufficiently densely populated.
14    var populate = Math.floor(target / 8 + 1);
15
16    try {
17        var arr = new Array();
18        for (i=0; i < populate; ++i)
19            arr[i] = 0;
20        arr[target] = 0;
21    } catch(e) {
22        var expect_name = "Error";
23        var expect_message = "Out of memory";
24        if ((e.name == expect_name) && (e.message == expect_message))
25            document.write("<p>SUCCESS</p>");
26        else
27            document.write("<p>FAIL - Expected \"" + expect_name + "/" + expect_message + "\", got \"" + e.name + "/" + e.message + "\".</p>");
28
29        return;
30    }
31
32    document.write("<p>FAIL - Expected exception.</p>");
33}
34
35</script>
36</head>
37<body>
38<p>This test checks that Array objects fail gracefully (throw exception) when array length grows large.</p>
39<p>This test may run for over 20 seconds on a fast machine, and will consume hundereds of MB of memory.</p>
40<input type="button" onclick="runArrayOOMTest()" value="Start">
41</body>
42</html>
43