/*
 * 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.alloc.util;

import static com.oracle.graal.alloc.util.LocationUtil.*;

import java.util.*;

import com.oracle.graal.api.meta.*;
import com.oracle.graal.lir.*;
import com.oracle.graal.lir.LIRInstruction.*;

public class LocationMap {
    private final Location[] locations;

    public LocationMap(int numVariables) {
        locations = new Location[numVariables];
    }

    public LocationMap(LocationMap template) {
        locations = Arrays.copyOf(template.locations, template.locations.length);
    }

    public Location get(Variable variable) {
        assert locations[variable.index] == null || locations[variable.index].variable == variable;
        return locations[variable.index];
    }

    public void put(Location location) {
        locations[location.variable.index] = location;
    }

    public void clear(Variable variable) {
        locations[variable.index] = null;
    }

    public void forEachLocation(ValueProcedure proc) {
        for (int i = 0; i < locations.length; i++) {
            if (locations[i] != null) {
                RiValue newValue = proc.doValue(locations[i], null, null);
                assert newValue == null || asLocation(newValue).variable == locations[i].variable;
                locations[i] = (Location) newValue;
            }
        }
    }

    public boolean checkEmpty() {
        for (int i = 0; i < locations.length; i++) {
            assert locations[i] == null;
        }
        return true;
    }
}