--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Compiler/src/com/sun/c1x/ir/PointerOp.java	Wed Apr 27 11:43:22 2011 +0200
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2010, 2010, 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.*;
+
+/**
+ * The base class for pointer access operations.
+ *
+ * @author Doug Simon
+ */
+public abstract class PointerOp extends StateSplit {
+
+    /**
+     * The kind of value at the address accessed by the pointer operation.
+     */
+    public final CiKind dataKind;
+
+    public final int opcode;
+    protected Value pointer;
+    protected Value displacement;
+    protected Value offsetOrIndex;
+    protected final boolean isVolatile;
+    final boolean isPrefetch;
+
+    /**
+     * Creates an instruction for a pointer operation. If {@code displacement != null}, the effective of the address of the operation is
+     * computed as the pointer plus a byte displacement plus a scaled index. Otherwise, the effective address is computed as the
+     * pointer plus a byte offset.
+     *
+     * @param kind the kind of value produced by this operation
+     * @param dataKind the kind of value at the address accessed by the pointer operation
+     * @param opcode the opcode of the instruction
+     * @param pointer the value producing the pointer
+     * @param displacement the value producing the displacement. This may be {@code null}.
+     * @param offsetOrIndex the value producing the scaled-index or the byte offset depending on whether {@code displacement} is {@code null}
+     * @param stateBefore the state before
+     * @param isVolatile {@code true} if the access is volatile
+     */
+    public PointerOp(CiKind kind, CiKind dataKind, int opcode, Value pointer, Value displacement, Value offsetOrIndex, FrameState stateBefore, boolean isVolatile) {
+        super(kind.stackKind(), stateBefore);
+        this.opcode = opcode;
+        this.pointer = pointer;
+        this.dataKind = dataKind;
+        this.displacement = displacement;
+        this.offsetOrIndex = offsetOrIndex;
+        this.isVolatile = isVolatile;
+        this.isPrefetch = false;
+        if (pointer.isNonNull()) {
+            eliminateNullCheck();
+        }
+    }
+
+    public Value pointer() {
+        return pointer;
+    }
+
+    public Value index() {
+        return offsetOrIndex;
+    }
+
+    public Value offset() {
+        return offsetOrIndex;
+    }
+
+    public Value displacement() {
+        return displacement;
+    }
+
+    @Override
+    public void runtimeCheckCleared() {
+        clearState();
+    }
+
+    /**
+     * Checks whether this field access may cause a trap or an exception, which
+     * is if it either requires a null check or needs patching.
+     * @return {@code true} if this field access can cause a trap
+     */
+    @Override
+    public boolean canTrap() {
+        return needsNullCheck();
+    }
+
+    /**
+     * Iterates over the input values to this instruction.
+     * @param closure the closure to apply to each value
+     */
+    @Override
+    public void inputValuesDo(ValueClosure closure) {
+        pointer = closure.apply(pointer);
+        offsetOrIndex = closure.apply(offsetOrIndex);
+        if (displacement != null) {
+            displacement = closure.apply(displacement);
+        }
+    }
+}