/*
 * 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.sun.c1x.ir;

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

/**
 * Denotes the test of a given bit at a given offset from a base register and a branch based on the test.
 * Perhaps this should be a subclass of {@link If} or {@link IfOp}, but that might have unintended consequences.
 */
public class IfBit extends BlockEnd {

    public final CiRegister register;
    public final int offset;
    public final Condition condition;
    public final int bitNo;

    public IfBit(CiRegister reg, int offset, int bitNo, Condition cond, BlockBegin tSucc, BlockBegin fSucc) {
        super(CiKind.Illegal, null, false);
        setFlag(Flag.LiveControl);
        this.register = reg;
        this.offset = offset;
        this.bitNo = bitNo;
        assert cond == Condition.EQ || cond == Condition.NE;
        this.condition = cond;
        successors.add(tSucc);
        successors.add(fSucc);
    }

    @Override
    public void accept(ValueVisitor v) {
        v.visitIfBit(this);
    }

    @Override
    public void print(LogStream out) {
        out.print("ifbit");
    }

    public BlockBegin trueSuccessor() {
        return successors.get(0);
    }

    public BlockBegin falseSuccessor() {
        return successors.get(1);
    }
}