001/*
002 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.debug.internal;
024
025import com.oracle.graal.debug.*;
026
027/**
028 * A helper class for DebugValues that can nest and need to split out accumulated and flat values
029 * for some kind of counter-like measurement.
030 */
031abstract class CloseableCounterImpl implements DebugCloseable {
032
033    protected final CloseableCounterImpl parent;
034    protected final AccumulatedDebugValue counter;
035    protected final long start;
036    protected long nestedAmountToSubtract;
037
038    CloseableCounterImpl(CloseableCounterImpl parent, AccumulatedDebugValue counter) {
039        this.parent = parent;
040        this.start = getCounterValue();
041        this.counter = counter;
042    }
043
044    @Override
045    public void close() {
046        long end = getCounterValue();
047        long difference = end - start;
048        if (parent != null) {
049            if (!counter.getName().equals(parent.counter.getName())) {
050                parent.nestedAmountToSubtract += difference;
051
052                // Look for our counter in an outer scope and fix up
053                // the adjustment to the flat count
054                CloseableCounterImpl ancestor = parent.parent;
055                while (ancestor != null) {
056                    if (ancestor.counter.getName().equals(counter.getName())) {
057                        ancestor.nestedAmountToSubtract -= difference;
058                        break;
059                    }
060                    ancestor = ancestor.parent;
061                }
062            }
063        }
064        long flatAmount = difference - nestedAmountToSubtract;
065        counter.addToCurrentValue(difference);
066        counter.flat.addToCurrentValue(flatAmount);
067    }
068
069    abstract long getCounterValue();
070}