/*
 * Copyright (c) 2011, 2012, 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.hotspot.nodes;

import com.oracle.graal.api.code.*;
import com.oracle.graal.api.meta.*;
import com.oracle.graal.hotspot.*;
import com.oracle.graal.nodes.calc.*;
import com.oracle.graal.nodes.spi.*;
import com.oracle.graal.nodes.type.*;

/**
 * A node that loads the {@link Thread} object for the current thread.
 */
public final class CurrentThread extends FloatingNode implements LIRLowerable {

    public CurrentThread() {
        super(StampFactory.declaredNonNull(HotSpotGraalRuntime.getInstance().getRuntime().lookupJavaType(Thread.class)));
    }

    @Override
    public void generate(LIRGeneratorTool gen) {
        HotSpotGraalRuntime runtime = HotSpotGraalRuntime.getInstance();
        Register thread = runtime.getRuntime().threadRegister();
        gen.setResult(this, gen.emitLoad(Kind.Object, thread.asValue(gen.target().wordKind), runtime.getConfig().threadObjectOffset, Value.ILLEGAL, 0, false));
    }

    @NodeIntrinsic
    public static Thread get() {
        return Thread.currentThread();
    }
}