8137281: OutOfMemoryError with large numeric keys in JSON.parse

Reviewed-by: attila, mhaupt

src/jdk/nashorn/internal/runtime/arrays/SparseArrayData.java

@@ -36,7 +36,7 @@ import jdk.nashorn.internal.runtime.ScriptRuntime;
  * Handle arrays where the index is very large.
  */
 class SparseArrayData extends ArrayData {
-    static final int MAX_DENSE_LENGTH = 8 * 1024 * 1024;
+    static final int MAX_DENSE_LENGTH = 1024 * 1024;
 
     /** Underlying array. */
     private ArrayData underlying;

test/script/basic/JDK-8137281.js

+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8137281: OutOfMemoryError with large numeric keys in JSON.parse
+ *
+ * @test
+ * @run
+ */
+
+function createObject(startKey, level1, level2) {
+    var root = {};
+    var key = startKey;
+    for (var i = 0; i < level1; i++) {
+        var child = {};
+        for (var j = 0; j < level2; j++) {
+            child[key++] = {};
+        }
+        root[key++] = child;
+    }
+    return root;
+}
+
+JSON.parse(JSON.stringify(createObject(500000, 20, 20)));
+JSON.parse(JSON.stringify(createObject(1000000, 20, 20)));
+JSON.parse(JSON.stringify(createObject(2000000, 20, 20)));
+JSON.parse(JSON.stringify(createObject(4000000, 20, 20)));
+JSON.parse(JSON.stringify(createObject(8000000, 20, 20)));
+JSON.parse(JSON.stringify(createObject(16000000, 20, 20)));