--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/memory/CodeHeap.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2000-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.memory;
+
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.types.*;
+
+public class CodeHeap extends VMObject {
+  private static Field         memoryField;
+  private static Field         segmapField;
+  //  private static CIntegerField numberOfCommittedSegmentsField;
+  //  private static CIntegerField numberOfReservedSegmentsField;
+  //  private static CIntegerField segmentSizeField;
+  private static CIntegerField log2SegmentSizeField;
+  //  private static CIntegerField nextSegmentField;
+  //  private static AddressField  freelistField;
+  //  private static CIntegerField freeSegmentsField;
+
+  private VirtualSpace memory;
+  private VirtualSpace segmentMap;
+  private int log2SegmentSize;
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static void initialize(TypeDataBase db) {
+    Type type = db.lookupType("CodeHeap");
+
+    memoryField          = type.getField("_memory");
+    segmapField          = type.getField("_segmap");
+    log2SegmentSizeField = type.getCIntegerField("_log2_segment_size");
+
+  }
+
+  public CodeHeap(Address addr) {
+    super(addr);
+    log2SegmentSize = (int) log2SegmentSizeField.getValue(addr);
+    segmentMap = new VirtualSpace(addr.addOffsetTo(segmapField.getOffset()));
+    memory = new VirtualSpace(addr.addOffsetTo(memoryField.getOffset()));
+  }
+
+  public Address begin() {
+    return getMemory().low();
+  }
+
+  public Address end() {
+    return getMemory().high();
+  }
+
+  public boolean contains(Address p) {
+    return (begin().lessThanOrEqual(p) && end().greaterThan(p));
+  }
+
+  /** Returns the start of the block containing p or null */
+  public Address findStart(Address p) {
+    if (!contains(p)) return null;
+    HeapBlock h = blockStart(p);
+    if (h == null || h.isFree()) {
+      return null;
+    }
+    return h.getAllocatedSpace();
+  }
+
+  public Address nextBlock(Address ptr) {
+    Address base = blockBase(ptr);
+    if (base == null) {
+      return null;
+    }
+    HeapBlock block = getBlockAt(base);
+    return base.addOffsetTo(block.getLength() * (1 << getLog2SegmentSize()));
+  }
+
+  //--------------------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private VirtualSpace getMemory() {
+    return memory;
+  }
+
+  private VirtualSpace getSegmentMap() {
+    return segmentMap;
+  }
+
+  private long segmentFor(Address p) {
+    return p.minus(getMemory().low()) >> getLog2SegmentSize();
+  }
+
+  private int getLog2SegmentSize() {
+    return log2SegmentSize;
+  }
+
+  private HeapBlock getBlockAt(Address addr) {
+    return (HeapBlock) VMObjectFactory.newObject(HeapBlock.class, addr);
+  }
+
+
+  private HeapBlock blockStart(Address p) {
+    Address base = blockBase(p);
+    if (base == null) return null;
+    return getBlockAt(base);
+  }
+
+  private Address blockBase(Address p) {
+    long i = segmentFor(p);
+    Address b = getSegmentMap().low();
+    if (b.getCIntegerAt(i, 1, true) == 0xFF) {
+      return null;
+    }
+    while (b.getCIntegerAt(i, 1, true) > 0) {
+      i -= b.getCIntegerAt(i, 1, true);
+    }
+    return getMemory().low().addOffsetTo(i << getLog2SegmentSize());
+  }
+
+}