--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Compiler/src/com/sun/c1x/ir/AccessIndexed.java	Wed Apr 27 11:43:22 2011 +0200
@@ -0,0 +1,111 @@
+/*
+ * 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 static com.sun.c1x.ir.Value.Flag.*;
+
+import com.sun.c1x.value.*;
+import com.sun.cri.ci.*;
+
+/**
+ * The {@code AccessIndexed} class is the base class of instructions that read or write
+ * elements of an array.
+ *
+ * @author Ben L. Titzer
+ */
+public abstract class AccessIndexed extends AccessArray {
+
+    private Value index;
+    private Value length;
+    private final CiKind elementType;
+
+    /**
+     * Create an new AccessIndexed instruction.
+     * @param kind the result kind of the access
+     * @param array the instruction producing the array
+     * @param index the instruction producing the index
+     * @param length the instruction producing the length (used in bounds check elimination?)
+     * @param elementType the type of the elements of the array
+     * @param stateBefore the state before executing this instruction
+     */
+    AccessIndexed(CiKind kind, Value array, Value index, Value length, CiKind elementType, FrameState stateBefore) {
+        super(kind, array, stateBefore);
+        this.index = index;
+        this.length = length;
+        this.elementType = elementType;
+    }
+
+    /**
+     * Gets the instruction producing the index into the array.
+     * @return the index
+     */
+    public Value index() {
+        return index;
+    }
+
+    /**
+     * Gets the instruction that produces the length of the array.
+     * @return the length
+     */
+    public Value length() {
+        return length;
+    }
+
+    /**
+     * Gets the element type of the array.
+     * @return the element type
+     */
+    public CiKind elementKind() {
+        return elementType;
+    }
+
+    /**
+     * Checks whether this instruction needs a bounds check.
+     * @return {@code true} if a bounds check is needed
+     */
+    public boolean needsBoundsCheck() {
+        return !checkFlag(NoBoundsCheck);
+    }
+
+    public void eliminateBoundsCheck() {
+        clearRuntimeCheck(NoBoundsCheck);
+    }
+
+    /**
+     * Checks whether this instruction can cause a trap.
+     * @return {@code true} if this instruction can cause a trap
+     */
+    @Override
+    public boolean canTrap() {
+        return needsNullCheck() || needsBoundsCheck();
+    }
+
+    @Override
+    public void inputValuesDo(ValueClosure closure) {
+        super.inputValuesDo(closure);
+        index = closure.apply(index);
+        if (length != null) {
+            length = closure.apply(length);
+        }
+    }
+}