--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/GraalCompiler/src/com/sun/c1x/ir/AccessField.java	Wed Apr 27 11:50:44 2011 +0200
@@ -0,0 +1,138 @@
+/*
+ * 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 java.lang.reflect.*;
+
+import com.sun.c1x.*;
+import com.sun.c1x.value.*;
+import com.sun.cri.ci.*;
+import com.sun.cri.ri.*;
+
+/**
+ * The base class of all instructions that access fields.
+ *
+ * @author Ben L. Titzer
+ */
+public abstract class AccessField extends StateSplit {
+
+    private Value object;
+    protected final RiField field;
+
+    /**
+     * Constructs a new access field object.
+     * @param kind the result kind of the access
+     * @param object the instruction producing the receiver object
+     * @param field the compiler interface representation of the field
+     * @param isStatic indicates if the field is static
+     * @param stateBefore the state before the field access
+     * @param isLoaded indicates if the class is loaded
+     */
+    public AccessField(CiKind kind, Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) {
+        super(kind, stateBefore);
+        this.object = object;
+        this.field = field;
+        if (!isLoaded || (C1XOptions.TestPatching && !Modifier.isVolatile(field.accessFlags()))) {
+            // require patching if the field is not loaded (i.e. resolved),
+            // or if patch testing is turned on (but not if the field is volatile)
+            setFlag(Flag.NeedsPatching);
+        }
+        initFlag(Flag.IsLoaded, isLoaded);
+        initFlag(Flag.IsStatic, isStatic);
+        if (isLoaded && object.isNonNull()) {
+            eliminateNullCheck();
+        }
+        assert object != null : "every field access must reference some object";
+    }
+
+    /**
+     * Gets the instruction that produces the receiver object of this field access
+     * (for instance field accesses).
+     * @return the instruction that produces the receiver object
+     */
+    public Value object() {
+        return object;
+    }
+
+    /**
+     * Gets the compiler interface field for this field access.
+     * @return the compiler interface field for this field access
+     */
+    public RiField field() {
+        return field;
+    }
+
+    /**
+     * Checks whether this field access is an access to a static field.
+     * @return {@code true} if this field access is to a static field
+     */
+    public boolean isStatic() {
+        return checkFlag(Flag.IsStatic);
+    }
+
+    /**
+     * Checks whether the class of the field of this access is loaded.
+     * @return {@code true} if the class is loaded
+     */
+    public boolean isLoaded() {
+        return checkFlag(Flag.IsLoaded);
+    }
+
+    /**
+     * Checks whether this field is declared volatile.
+     * @return {@code true} if the field is resolved and declared volatile
+     */
+    public boolean isVolatile() {
+        return isLoaded() && Modifier.isVolatile(field.accessFlags());
+    }
+
+    @Override
+    public void runtimeCheckCleared() {
+        if (isLoaded()) {
+            clearState();
+        }
+    }
+
+    /**
+     * Checks whether this field access will require patching.
+     * @return {@code true} if this field access will require patching
+     */
+    public boolean needsPatching() {
+        return checkFlag(Flag.NeedsPatching);
+    }
+
+    /**
+     * 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 needsPatching() || needsNullCheck();
+    }
+
+    @Override
+    public void inputValuesDo(ValueClosure closure) {
+        object = closure.apply(object);
+    }
+}