--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.graal.compiler/src/com/sun/c1x/ir/StateSplit.java	Wed Jun 08 08:42:25 2011 +0200
@@ -0,0 +1,95 @@
+/*
+ * 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.c1x.ir;
+
+import com.oracle.graal.graph.*;
+import com.sun.c1x.value.*;
+import com.sun.cri.ci.*;
+
+/**
+ * The {@code StateSplit} class is the abstract base class of all instructions
+ * that store an immutable copy of the frame state.
+ */
+public abstract class StateSplit extends Instruction {
+
+    private static final int INPUT_COUNT = 1;
+    private static final int INPUT_STATE_BEFORE = 0;
+
+    private static final int SUCCESSOR_COUNT = 1;
+    private static final int SUCCESSOR_STATE_AFTER = 0;
+
+    @Override
+    protected int inputCount() {
+        return super.inputCount() + INPUT_COUNT;
+    }
+
+    @Override
+    protected int successorCount() {
+        return super.successorCount() + SUCCESSOR_COUNT;
+    }
+
+    /**
+     * The state for this instruction.
+     */
+    public FrameState stateBefore() {
+        return (FrameState) inputs().get(super.inputCount() + INPUT_STATE_BEFORE);
+    }
+
+    public FrameState setStateBefore(FrameState n) {
+        FrameState oldState = stateBefore();
+        try {
+            return (FrameState) inputs().set(super.inputCount() + INPUT_STATE_BEFORE, n);
+        } finally {
+            if (oldState != n && oldState != null) {
+                oldState.delete();
+            }
+        }
+    }
+
+    /**
+     * The state for this instruction.
+     */
+     @Override
+    public FrameState stateAfter() {
+        return (FrameState) successors().get(super.successorCount() + SUCCESSOR_STATE_AFTER);
+    }
+
+    public FrameState setStateAfter(FrameState n) {
+        return (FrameState) successors().set(super.successorCount() + SUCCESSOR_STATE_AFTER, n);
+    }
+
+    /**
+     * Creates a new state split with the specified value type.
+     * @param kind the type of the value that this instruction produces
+     * @param inputCount
+     * @param successorCount
+     * @param graph
+     */
+    public StateSplit(CiKind kind, int inputCount, int successorCount, Graph graph) {
+        super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
+    }
+
+    public boolean needsStateAfter() {
+        return true;
+    }
+}