/*

 * 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 org.graalvm.compiler.core.common.type;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.MemoryAccessProvider;

/**

 * Type describing primitive values.

 */

public abstract class PrimitiveStamp extends ArithmeticStamp {

    private final int bits;

    protected PrimitiveStamp(int bits, ArithmeticOpTable ops) {

        super(ops);

        this.bits = bits;

    }

    @Override

    public void accept(Visitor v) {

        v.visitInt(bits);

    }

    /**

     * The width in bits of the value described by this stamp.

     */

    public int getBits() {

        return bits;

    }

    public static int getBits(Stamp stamp) {

        if (stamp instanceof PrimitiveStamp) {

            return ((PrimitiveStamp) stamp).getBits();

        } else {

            return 0;

        }

    }

    @Override

    public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {

        try {

            return provider.readPrimitiveConstant(getStackKind(), base, displacement, getBits());

        } catch (IllegalArgumentException e) {

            /*

             * It's possible that the base and displacement aren't valid together so simply return

             * null.

             */

            return null;

        }

    }

    @Override

    public int hashCode() {

        final int prime = 31;

        int result = super.hashCode();

        result = prime * result + bits;

        return result;

    }

    @Override

    public boolean equals(Object obj) {

        if (this == obj) {

            return true;

        }

        if (!(obj instanceof PrimitiveStamp)) {

            return false;

        }

        PrimitiveStamp other = (PrimitiveStamp) obj;

        if (bits != other.bits) {

            return false;

        }

        return super.equals(obj);

    }

}