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 * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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 */


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);
    }
}
