--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/interpreter/Bytecode.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2001-2004 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.interpreter;
+
+import sun.jvm.hotspot.oops.*;
+import sun.jvm.hotspot.utilities.*;
+
+public class Bytecode {
+  Method method;
+  int bci;
+  static final int jintSize = 4;
+  static final String spaces = " ";
+  static final String comma  = ", ";
+
+  Bytecode(Method method, int bci) {
+    this.method = method;
+    this.bci    = bci;
+  }
+
+  // Address computation
+  // NOTE: assumes that the start of the method's bytecodes is 4-byte aligned
+  int alignedOffset(int offset) {
+    return Bits.roundTo(bci + offset, jintSize) - bci;
+  }
+
+  int javaSignedWordAt(int offset) {
+    return method.getBytecodeIntArg(bci + offset);
+  }
+
+  short javaShortAt(int offset) {
+    return method.getBytecodeShortArg(bci + offset);
+  }
+
+  byte javaByteAt(int offset) {
+    return method.getBytecodeByteArg(bci + offset);
+  }
+
+  public Method method() { return method; }
+  public int    bci()    { return bci;    }
+
+  // hotspot byte code
+  public int code() {
+    return Bytecodes.codeAt(method(), bci());
+  }
+
+  // jvm byte code
+  public int javaCode() {
+    return Bytecodes.javaCode(code());
+  }
+
+  public String getBytecodeName() {
+    return Bytecodes.name(code());
+  }
+
+  public String getJavaBytecodeName() {
+    return Bytecodes.name(javaCode());
+  }
+
+  public int getLength() {
+    return Bytecodes.lengthAt(method(), bci());
+  }
+
+  public int getJavaLength() {
+    return Bytecodes.javaLengthAt(method(), bci());
+  }
+
+  public String toString() {
+    StringBuffer buf = new StringBuffer(getJavaBytecodeName());
+    if (code() != javaCode()) {
+       buf.append(spaces);
+       buf.append('[');
+       buf.append(getBytecodeName());
+       buf.append(']');
+    }
+    return buf.toString();
+  }
+}