--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/tools/whitebox/sun/hotspot/WhiteBox.java	Thu Feb 23 14:58:35 2012 +0100
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2012, 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.
+ *
+ */
+
+package sun.hotspot;
+import java.security.BasicPermission;
+
+public class WhiteBox {
+
+  @SuppressWarnings("serial")
+  public static class WhiteBoxPermission extends BasicPermission {
+    public WhiteBoxPermission(String s) {
+      super(s);
+    }
+  }
+
+  private WhiteBox() {}
+  private static final WhiteBox instance = new WhiteBox();
+  private static native void registerNatives();
+
+  /**
+   * Returns the singleton WhiteBox instance.
+   *
+   * The returned WhiteBox object should be carefully guarded
+   * by the caller, since it can be used to read and write data
+   * at arbitrary memory addresses. It must never be passed to
+   * untrusted code.
+   */
+  public synchronized static WhiteBox getWhiteBox() {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null) {
+      sm.checkPermission(new WhiteBoxPermission("getInstance"));
+    }
+    return instance;
+  }
+
+  static {
+    registerNatives();
+  }
+
+  // Memory
+  public native long getObjectAddress(Object o);
+  public native int  getHeapOopSize();
+
+  // G1
+  public native boolean g1InConcurrentMark();
+  public native boolean g1IsHumongous(Object o);
+  public native long    g1NumFreeRegions();
+  public native int     g1RegionSize();
+}