--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Compiler/src/com/sun/c1x/ir/ArrayLength.java	Wed Apr 27 11:43:22 2011 +0200
@@ -0,0 +1,92 @@
+/*
+ * 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.debug.*;
+import com.sun.c1x.util.*;
+import com.sun.c1x.value.*;
+import com.sun.cri.bytecode.*;
+import com.sun.cri.ci.*;
+
+/**
+ * The {@code ArrayLength} instruction gets the length of an array.
+ *
+ * @author Ben L. Titzer
+ */
+public final class ArrayLength extends AccessArray {
+
+    /**
+     * Constructs a new ArrayLength instruction.
+     * @param array the instruction producing the array
+     * @param newFrameState the state before executing this instruction
+     */
+    public ArrayLength(Value array, FrameState newFrameState) {
+        super(CiKind.Int, array, newFrameState);
+        if (array.isNonNull()) {
+            eliminateNullCheck();
+        }
+    }
+
+    /**
+     * Clears the state associated with a null check.
+     */
+    @Override
+    public void runtimeCheckCleared() {
+        if (!needsNullCheck()) {
+            clearState();
+        }
+    }
+
+    /**
+     * Checks whether this instruction can cause a trap.
+     * @return {@code true} if this instruction can cause a trap
+     */
+    @Override
+    public boolean canTrap() {
+        return needsNullCheck();
+    }
+
+    @Override
+    public void accept(ValueVisitor v) {
+        v.visitArrayLength(this);
+    }
+
+    @Override
+    public int valueNumber() {
+        return Util.hash1(Bytecodes.ARRAYLENGTH, array);
+    }
+
+    @Override
+    public boolean valueEqual(Instruction i) {
+        if (i instanceof ArrayLength) {
+            ArrayLength o = (ArrayLength) i;
+            return array == o.array;
+        }
+        return false;
+    }
+
+    @Override
+    public void print(LogStream out) {
+        out.print(array).print(".length");
+    }
+}