--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeSwitch.java	Sat Dec 17 19:59:18 2011 +0100
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2009, 2011, 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 com.sun.cri.bytecode;
+
+/**
+ * An abstract class that provides the state and methods common to {@link Bytecodes#LOOKUPSWITCH}
+ * and {@link Bytecodes#TABLESWITCH} instructions.
+ */
+public abstract class BytecodeSwitch {
+    /**
+     * The {@link BytecodeStream} containing bytecode array or {@code null} if {@link #code} is not {@code null}.
+     */
+    private final BytecodeStream stream;
+    /**
+     * The bytecode array or {@code null} if {@link #stream} is not {@code null}.
+     */
+    private final byte[] code;
+    /**
+     * Index of start of switch instruction.
+     */
+    protected final int bci;
+    /**
+     * Index of the start of the additional data for the switch instruction, aligned to a multiple of four from the method start.
+     */
+    protected final int alignedBci;
+
+    /**
+     * Constructor for a {@link BytecodeStream}.
+     * @param stream the {@code BytecodeStream} containing the switch instruction
+     * @param bci the index in the stream of the switch instruction
+     */
+    public BytecodeSwitch(BytecodeStream stream, int bci) {
+        this.alignedBci = (bci + 4) & 0xfffffffc;
+        this.stream = stream;
+        this.code = null;
+        this.bci = bci;
+    }
+
+    /**
+     * Constructor for a bytecode array.
+     * @param code the bytecode array containing the switch instruction.
+     * @param bci the index in the array of the switch instruction
+     */
+    public BytecodeSwitch(byte[] code, int bci) {
+        this.alignedBci = (bci + 4) & 0xfffffffc;
+        this.stream = null;
+        this.code = code;
+        this.bci = bci;
+    }
+
+    /**
+     * Gets the current bytecode index.
+     * @return the current bytecode index
+     */
+    public int bci() {
+        return bci;
+    }
+
+    /**
+     * Gets the index of the instruction denoted by the {@code i}'th switch target.
+     * @param i index of the switch target
+     * @return the index of the instruction denoted by the {@code i}'th switch target
+     */
+    public int targetAt(int i) {
+        return bci + offsetAt(i);
+    }
+
+    /**
+     * Gets the index of the instruction for the default switch target.
+     * @return the index of the instruction for the default switch target
+     */
+    public int defaultTarget() {
+        return bci + defaultOffset();
+    }
+
+    /**
+     * Gets the offset from the start of the switch instruction to the default switch target.
+     * @return the offset to the default switch target
+     */
+    public abstract int defaultOffset();
+
+    /**
+     * Gets the key at {@code i}'th switch target index.
+     * @param i the switch target index
+     * @return the key at {@code i}'th switch target index
+     */
+    public abstract int keyAt(int i);
+
+    /**
+     * Gets the offset from the start of the switch instruction for the {@code i}'th switch target.
+     * @param i the switch target index
+     * @return the offset to the {@code i}'th switch target
+     */
+    public abstract int offsetAt(int i);
+
+    /**
+     * Gets the number of switch targets.
+     * @return the number of switch targets
+     */
+    public abstract int numberOfCases();
+
+    /**
+     * Gets the total size in bytes of the switch instruction.
+     * @return the total size in bytes of the switch instruction
+     */
+    public abstract int size();
+
+    /**
+     * Reads the signed value at given bytecode index.
+     * @param bci the start index of the value to retrieve
+     * @return the signed, 4-byte value in the bytecode array starting at {@code bci}
+     */
+    protected int readWord(int bci) {
+        if (code != null) {
+            return Bytes.beS4(code, bci);
+        }
+        return stream.readInt(bci);
+    }
+}