<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<head>
<script>
function runArrayOOMTest() {
document.write("<p>Starting test...</p>");
// 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
// to overflow. The vector needs to be ((target + 1) * sizeof(JSValue*)) bytes long to hold 'target', or approximately 2/3 UINT32_MAX. Upon growing
// the array an additional 50% capacity will be allocated, plus the storage object header, taking the size of the allocation over UINT32_MAX.
var target = Math.floor(0xFFFFFFFF / 6);
// 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.
var populate = Math.floor(target / 8 + 1);
try {
var arr = new Array();
for (i=0; i < populate; ++i)
arr[i] = 0;
arr[target] = 0;
} catch(e) {
var expect_name = "Error";
var expect_message = "Out of memory";
if ((e.name == expect_name) && (e.message == expect_message))
document.write("<p>SUCCESS</p>");
else
document.write("<p>FAIL - Expected \"" + expect_name + "/" + expect_message + "\", got \"" + e.name + "/" + e.message + "\".</p>");
return;
}
document.write("<p>FAIL - Expected exception.</p>");
}
</script>
</head>
<body>
<p>This test checks that Array objects fail gracefully (throw exception) when array length grows large.</p>
<p>This test may run for over 20 seconds on a fast machine, and will consume hundereds of MB of memory.</p>
<input type="button" onclick="runArrayOOMTest()" value="Start">
</body>
</html>