src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.meta/src/jdk/vm/ci/meta/AbstractProfiledItem.java
author kvn
Fri, 30 Mar 2018 07:47:20 -0700
changeset 49654 16f53c9c7493
parent 47216 71c04702a3d5
permissions -rw-r--r--
8200461: MeetIncompatibleInterfaceArrays test fails with -Xcomp Summary: Add requires to run test only in Xmixed mode. Reviewed-by: simonis
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/*
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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.vm.ci.meta;
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/**
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 * A profiled type that has a probability. Profiled types are naturally sorted in descending order
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 * of their probabilities.
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 */
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public abstract class AbstractProfiledItem<T> implements Comparable<AbstractProfiledItem<?>> {
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    protected final T item;
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    protected final double probability;
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    public AbstractProfiledItem(T item, double probability) {
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        assert item != null;
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        assert probability >= 0.0D && probability <= 1.0D;
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        this.item = item;
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        this.probability = probability;
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    }
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    protected T getItem() {
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        return item;
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    }
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    /**
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     * Returns the estimated probability of {@link #getItem()}.
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     *
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     * @return double value &ge; 0.0 and &le; 1.0
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     */
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    public double getProbability() {
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        return probability;
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    }
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    /**
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     * Returns -1 if the {@linkplain #getProbability() probability} of this item is greater than
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     * {@code o}'s probability, 0 if there are equal otherwise 1.
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     */
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    @Override
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    public int compareTo(AbstractProfiledItem<?> o) {
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        // Need to swap the order of operands so that higher probabilities are sorted first
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        return Double.compare(o.getProbability(), getProbability());
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    }
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    @Override
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    public int hashCode() {
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        final int prime = 31;
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        int result = 1;
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        long temp;
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        temp = Double.doubleToLongBits(probability);
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        result = prime * result + (int) (temp ^ (temp >>> 32));
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        result = prime * result + item.hashCode();
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        return result;
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    }
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    @Override
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    public boolean equals(Object obj) {
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        if (this == obj) {
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            return true;
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        }
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        if (obj == null) {
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            return false;
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        }
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        if (getClass() != obj.getClass()) {
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            return false;
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        }
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        AbstractProfiledItem<?> other = (AbstractProfiledItem<?>) obj;
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        if (Double.doubleToLongBits(probability) != Double.doubleToLongBits(other.probability)) {
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            return false;
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        }
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        return item.equals(other.item);
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    }
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    @Override
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    public abstract String toString();
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}