--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/GraalCompiler/src/com/sun/c1x/ir/UnsafeCast.java	Wed Apr 27 11:50:44 2011 +0200
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2010, 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.sun.c1x.debug.*;
+import com.sun.cri.bytecode.*;
+import com.sun.cri.ci.*;
+import com.sun.cri.ri.*;
+
+/**
+ * The {@code UnsafeCast} instruction represents a {@link Bytecodes#UNSAFE_CAST}.
+ *
+ * @author Doug Simon
+ */
+public final class UnsafeCast extends Instruction {
+
+    public final RiType toType;
+
+    /**
+     * The instruction that produced the value being unsafe cast.
+     */
+    private Value value;
+
+    /**
+     * Denotes if this is a redundant cast at the machine level. That is the source
+     * and the destination kind are implemented by the same machine kind.
+     */
+    public final boolean redundant;
+
+    /**
+     * Creates a new UnsafeCast instruction.
+     *
+     * @param toType the the being cast to
+     * @param value the value being cast
+     */
+    public UnsafeCast(RiType toType, Value value, boolean redundant) {
+        super(toType.kind().stackKind());
+        this.toType = toType;
+        this.value = value;
+        this.redundant = redundant;
+    }
+
+    /**
+     * Gets the first non-redundant value derived from this value. If this
+     * value is not {@linkplain #redundant}, then it is returned. Otherwise,
+     * the first value found by following {@link #value()} that is not an
+     * unsafe cast or is not redundant is returned.
+     */
+    public Value nonRedundantReplacement() {
+        if (!redundant) {
+            return this;
+        }
+        if (!(value instanceof UnsafeCast)) {
+            return value;
+        }
+        return ((UnsafeCast) value).nonRedundantReplacement();
+    }
+
+    /**
+     * Gets the instruction that produced the value being unsafe cast.
+     */
+    public Value value() {
+        return value;
+    }
+
+    @Override
+    public RiType declaredType() {
+        return toType;
+    }
+
+    @Override
+    public RiType exactType() {
+        return declaredType().exactType();
+    }
+
+    @Override
+    public void accept(ValueVisitor v) {
+        v.visitUnsafeCast(this);
+    }
+
+    /**
+     * Iterates over the input values to this instruction.
+     * @param closure the closure to apply
+     */
+    @Override
+    public void inputValuesDo(ValueClosure closure) {
+        value = closure.apply(value);
+    }
+
+    @Override
+    public void print(LogStream out) {
+        out.print("unsafe_cast(").
+        print(value).
+        print(") ").
+        print(CiUtil.toJavaName(toType));
+    }
+}