--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Compiler/src/com/sun/c1x/ir/TypeCheck.java	Wed Apr 27 11:43:22 2011 +0200
@@ -0,0 +1,119 @@
+/*
+ * 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.sun.c1x.value.*;
+import com.sun.cri.ci.*;
+import com.sun.cri.ri.*;
+
+/**
+ * The {@code TypeCheck} instruction is the base class of casts and instanceof tests.
+ *
+ * @author Ben L. Titzer
+ */
+public abstract class TypeCheck extends StateSplit {
+
+    final RiType targetClass;
+    public Value targetClassInstruction;
+    Value object;
+
+    /**
+     * Creates a new TypeCheck instruction.
+     * @param targetClass the class which is being casted to or checked against
+     * @param object the instruction which produces the object
+     * @param kind the result type of this instruction
+     * @param stateBefore the state before this instruction is executed
+     */
+    public TypeCheck(RiType targetClass, Value targetClassInstruction, Value object, CiKind kind, FrameState stateBefore) {
+        super(kind, stateBefore);
+        this.targetClass = targetClass;
+        this.targetClassInstruction = targetClassInstruction;
+        this.object = object;
+    }
+
+    /**
+     * Gets the instruction that loads the target class object that is used by this checkcast.
+     * @return the target class instruction
+     */
+    public Value targetClassInstruction() {
+        return targetClassInstruction;
+    }
+
+    /**
+     * Gets the target class, i.e. the class being cast to, or the class being tested against.
+     * @return the target class
+     */
+    public RiType targetClass() {
+        return targetClass;
+    }
+
+    /**
+     * Gets the instruction which produces the object input.
+     * @return the instruction producing the object
+     */
+    public Value object() {
+        return object;
+    }
+
+    /**
+     * Checks whether the target class of this instruction is loaded.
+     * @return {@code true} if the target class is loaded
+     */
+    public boolean isLoaded() {
+        return targetClass != null;
+    }
+
+    /**
+     * Checks whether this instruction can trap.
+     * @return {@code true}, conservatively assuming the cast may fail
+     */
+    @Override
+    public boolean canTrap() {
+        return true;
+    }
+
+    /**
+     * Iterates over the input values to this instruction.
+     * @param closure the closure to apply
+     */
+    @Override
+    public void inputValuesDo(ValueClosure closure) {
+        object = closure.apply(object);
+        targetClassInstruction = closure.apply(targetClassInstruction);
+    }
+
+    /**
+     * Sets this type check operation to be a direct compare.
+     */
+    public void setDirectCompare() {
+        setFlag(Flag.DirectCompare);
+    }
+
+    /**
+     * Checks where this comparison is a direct compare, because the class compared to is a leaf class.
+     * @return {@code true} if this typecheck is a direct compare
+     */
+    public boolean isDirectCompare() {
+        return checkFlag(Flag.DirectCompare);
+    }
+}