/*
 * 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.oracle.max.graal.compiler.nodes.java;

import java.lang.reflect.*;
import java.util.*;

import com.oracle.max.graal.compiler.nodes.base.*;
import com.oracle.max.graal.graph.*;
import com.sun.cri.ci.*;
import com.sun.cri.ri.*;

/**
 * The base class of all instructions that access fields.
 */
public abstract class AccessFieldNode extends StateSplit {

    @Input    private ValueNode object;

    public ValueNode object() {
        return object;
    }

    public void setObject(ValueNode x) {
        updateUsages(object, x);
        object = x;
    }

    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 graph
     */
    public AccessFieldNode(CiKind kind, ValueNode object, RiField field, Graph graph) {
        super(kind, graph);
        this.field = field;
        setObject(object);
        assert field.isResolved();
        assert field.holder().isInitialized();
    }

    /**
     * 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 Modifier.isStatic(field.accessFlags());
    }

    /**
     * Checks whether this field is declared volatile.
     * @return {@code true} if the field is resolved and declared volatile
     */
    public boolean isVolatile() {
        return Modifier.isVolatile(field.accessFlags());
    }

    @Override
    public Map<Object, Object> getDebugProperties() {
        Map<Object, Object> properties = super.getDebugProperties();
        properties.put("field", field);
        return properties;
    }
}