--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/asm/Register.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2000-2002 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.asm;
+
+/** <P> Register is an abstraction over machine registers. </P>
+
+    <P> FIXME: should align constants with underlying VM code </P> */
+
+public abstract class Register extends ImmediateOrRegister {
+  /** Corresponds to the machine register code. -1 stands for invalid
+      register (initial value). */
+  protected int number;
+
+  public Register() {
+    number = -1;
+  }
+
+  public Register(int number) {
+    this.number = number;
+  }
+
+  /** Must be overridden by subclass to indicate number of available
+      registers on this platform */
+  public abstract int getNumberOfRegisters();
+
+  public boolean isValid() {
+    return ((0 <= number) && (number <= getNumberOfRegisters()));
+  }
+
+  public int getNumber() {
+    return number;
+  }
+
+  public boolean equals(Object x) {
+    if (x == null) {
+      return false;
+    }
+
+    if (!getClass().equals(x.getClass())) {
+      return false;
+    }
+
+    Register reg = (Register) x;
+
+    return (reg.getNumber() == getNumber());
+  }
+
+  public int hashCode() {
+    return number;
+  }
+
+  public boolean isRegister() {
+    return true;
+  }
+
+  public abstract boolean isStackPointer();
+  public abstract boolean isFramePointer();
+  public abstract boolean isFloat();
+}