--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/memory/Space.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2000-2003 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.io.*;
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.runtime.*;
+
+/** <P> A Space describes a heap area. Class Space is an abstract base
+    class. </P>
+
+    <P> Space supports allocation, size computation and GC support is
+    provided. </P>
+
+    <P> Invariant: bottom() and end() are on page_size boundaries and: </P>
+
+    <P> bottom() <= top() <= end() </P>
+
+    <P> top() is inclusive and end() is exclusive. </P> */
+
+public abstract class Space extends VMObject {
+  private static AddressField bottomField;
+  private static AddressField endField;
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static synchronized void initialize(TypeDataBase db) {
+    Type type = db.lookupType("Space");
+
+    bottomField = type.getAddressField("_bottom");
+    endField    = type.getAddressField("_end");
+  }
+
+  public Space(Address addr) {
+    super(addr);
+  }
+
+  public Address   bottom()       { return bottomField.getValue(addr); }
+  public Address   end()          { return endField.getValue(addr);    }
+
+  /** Returns a subregion of the space containing all the objects in
+      the space. */
+  public MemRegion usedRegion() {
+    return new MemRegion(bottom(), end());
+  }
+
+  /** Support for iteration over heap -- not sure how this will
+      interact with GC in reflective system, but necessary for the
+      debugging mechanism */
+  public OopHandle bottomAsOopHandle() {
+    return bottomField.getOopHandle(addr);
+  }
+
+  /** Support for iteration over heap -- not sure how this will
+      interact with GC in reflective system, but necessary for the
+      debugging mechanism */
+  public OopHandle nextOopHandle(OopHandle handle, long size) {
+    return handle.addOffsetToAsOopHandle(size);
+  }
+
+  /** returns all MemRegions where live objects are */
+  public abstract List/*<MemRegion>*/ getLiveRegions();
+
+  /** Returned value is in bytes */
+  public long capacity() { return end().minus(bottom()); }
+  /** Returned value is in bytes */
+  public abstract long used();
+  /** Returned value is in bytes */
+  public abstract long free();
+
+  /** Testers */
+  public boolean contains(Address p) {
+    return (bottom().lessThanOrEqual(p) && end().greaterThan(p));
+  }
+
+  public void print() { printOn(System.out); }
+  public void printOn(PrintStream tty) {
+    tty.print(" space capacity = ");
+    tty.print(capacity());
+    tty.print(", ");
+    tty.print((double) used() * 100.0/ capacity());
+    tty.print(" used");
+  }
+}