--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/G1HeapRegionTable.java	Wed Oct 16 11:46:06 2013 +0200
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2013, 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.jvm.hotspot.gc_implementation.g1;
+
+import java.util.Iterator;
+import java.util.Observable;
+import java.util.Observer;
+
+import sun.jvm.hotspot.debugger.Address;
+import sun.jvm.hotspot.runtime.VM;
+import sun.jvm.hotspot.runtime.VMObject;
+import sun.jvm.hotspot.runtime.VMObjectFactory;
+import sun.jvm.hotspot.types.AddressField;
+import sun.jvm.hotspot.types.CIntegerField;
+import sun.jvm.hotspot.types.Type;
+import sun.jvm.hotspot.types.TypeDataBase;
+
+// Mirror class for G1HeapRegionTable. It's essentially an index -> HeapRegion map.
+
+public class G1HeapRegionTable extends VMObject {
+    // HeapRegion** _base;
+    static private AddressField baseField;
+    // uint _length;
+    static private CIntegerField lengthField;
+    // HeapRegion** _biased_base
+    static private AddressField biasedBaseField;
+    // size_t _bias
+    static private CIntegerField biasField;
+    // uint _shift_by
+    static private CIntegerField shiftByField;
+
+    static {
+        VM.registerVMInitializedObserver(new Observer() {
+                public void update(Observable o, Object data) {
+                    initialize(VM.getVM().getTypeDataBase());
+                }
+            });
+    }
+
+    static private synchronized void initialize(TypeDataBase db) {
+        Type type = db.lookupType("G1HeapRegionTable");
+
+        baseField = type.getAddressField("_base");
+        lengthField = type.getCIntegerField("_length");
+        biasedBaseField = type.getAddressField("_biased_base");
+        biasField = type.getCIntegerField("_bias");
+        shiftByField = type.getCIntegerField("_shift_by");
+    }
+
+    private HeapRegion at(long index) {
+        Address arrayAddr = baseField.getValue(addr);
+        // Offset of &_base[index]
+        long offset = index * VM.getVM().getAddressSize();
+        Address regionAddr = arrayAddr.getAddressAt(offset);
+        return (HeapRegion) VMObjectFactory.newObject(HeapRegion.class,
+                                                      regionAddr);
+    }
+
+    public long length() {
+        return lengthField.getValue(addr);
+    }
+
+    public long bias() {
+        return biasField.getValue(addr);
+    }
+
+    public long shiftBy() {
+        return shiftByField.getValue(addr);
+    }
+
+    private class HeapRegionIterator implements Iterator<HeapRegion> {
+        private long index;
+        private long length;
+
+        @Override
+        public boolean hasNext() { return index < length; }
+
+        @Override
+        public HeapRegion next() { return at(index++);    }
+
+        @Override
+        public void remove()     { /* not supported */    }
+
+        HeapRegionIterator(Address addr) {
+            index = 0;
+            length = length();
+        }
+    }
+
+    public Iterator<HeapRegion> heapRegionIterator() {
+        return new HeapRegionIterator(addr);
+    }
+
+    public G1HeapRegionTable(Address addr) {
+        super(addr);
+    }
+}