/*
 * 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
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 * questions.
 */
package com.oracle.max.graal.compiler.lir;

import com.oracle.max.asm.*;
import com.sun.cri.ci.*;

/**
 * The {@code LIRLabel} class definition.
 *
 * @author Marcelo Cintra
 */
public class LIRLabel extends LIROp0 {

    private Label label;

    /**
     * Constructs a LIRLabel instruction.
     * @param label the label
     */
    public LIRLabel(Label label) {
        super(LIROpcode.Label, CiValue.IllegalValue, null);
        assert label != null;
        this.label = label;
    }

    /**
     * Gets the label associated to this instruction.
     * @return the label
     */
    public Label label() {
        return label;
    }

    /**
     * Emits target assembly code for this LIRLabel instruction.
     * @param masm the LIRAssembler
     */
    @Override
    public void emitCode(LIRAssembler masm) {
        masm.emitOpLabel(this);
    }

    /**
     * Prints this instruction to a LogStream.
     */
    @Override
    public String operationString(OperandFormatter operandFmt) {
        return label.isBound() ? String.valueOf(label.position()) : "?";
    }
}