/*
 * Copyright (c) 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.graal.nodes.extended;

import com.oracle.graal.api.meta.*;
import com.oracle.graal.graph.*;
import com.oracle.graal.nodes.*;
import com.oracle.graal.nodes.java.*;
import com.oracle.graal.nodes.spi.*;
import com.oracle.graal.nodes.type.*;

public final class UnboxNode extends FixedWithNextNode implements Node.IterableNodeType, Canonicalizable {

    @Input private ValueNode source;
    private Kind destinationKind;

    public UnboxNode(Kind kind, ValueNode source) {
        super(StampFactory.forKind(kind));
        this.source = source;
        this.destinationKind = kind;
        assert kind != Kind.Object : "can only unbox to primitive";
        assert source.kind() == Kind.Object : "can only unbox objects";
    }

    public ValueNode source() {
        return source;
    }

    public Kind destinationKind() {
        return destinationKind;
    }

    public void expand(BoxingMethodPool pool) {
        ResolvedJavaField field = pool.getBoxField(kind());
        LoadFieldNode loadField = graph().add(new LoadFieldNode(source, field, StructuredGraph.INVALID_GRAPH_ID));
        loadField.setProbability(probability());
        ((StructuredGraph) graph()).replaceFixedWithFixed(this, loadField);
    }

    @Override
    public ValueNode canonical(CanonicalizerTool tool) {
        if (source.isConstant()) {
            Constant constant = source.asConstant();
            Object o = constant.asObject();
            if (o != null) {
                switch (destinationKind) {
                    case Boolean:
                        return ConstantNode.forBoolean((Boolean) o, graph());
                    case Byte:
                        return ConstantNode.forByte((Byte) o, graph());
                    case Char:
                        return ConstantNode.forChar((Character) o, graph());
                    case Short:
                        return ConstantNode.forShort((Short) o, graph());
                    case Int:
                        return ConstantNode.forInt((Integer) o, graph());
                    case Long:
                        return ConstantNode.forLong((Long) o, graph());
                    case Float:
                        return ConstantNode.forFloat((Long) o, graph());
                    case Double:
                        return ConstantNode.forDouble((Long) o, graph());
                    default:
                        ValueNodeUtil.shouldNotReachHere();
                }
            }
        }
        return this;
    }
}