Mercurial > hg > graal-compiler
view graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/SnippetCounter.java @ 6528:436a24c36abe
fixed imprecise dependencies
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 08 Oct 2012 17:18:31 +0200 |
parents | 9e56d5113c66 |
children | 41938af2b3d8 |
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/* * Copyright (c) 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.snippets; //JaCoCo Exclude import java.io.*; import java.util.*; import sun.misc.*; import com.oracle.graal.graph.*; import com.oracle.graal.snippets.Snippet.Fold; import com.oracle.graal.snippets.nodes.*; /** * A counter that can be safely {@linkplain #inc() incremented} from within a * snippet for gathering snippet specific metrics. */ public class SnippetCounter implements Comparable<SnippetCounter> { /** * A group of related counters. */ public static class Group { final String name; final List<SnippetCounter> counters; public Group(String name) { this.name = name; this.counters = new ArrayList<>(); } @Override public synchronized String toString() { Collections.sort(counters); long total = 0; int maxNameLen = 0; for (SnippetCounter c : counters) { total += c.value; maxNameLen = Math.max(c.name.length(), maxNameLen); } StringBuilder buf = new StringBuilder(String.format("Counters: %s%n", name)); for (SnippetCounter c : counters) { double percent = total == 0D ? 0D : ((double) (c.value * 100)) / total; buf.append(String.format(" %" + maxNameLen + "s: %5.2f%%%10d // %s%n", c.name, percent, c.value, c.description)); } return buf.toString(); } } /** * Sorts counters in descending order of their {@linkplain #value() values}. */ @Override public int compareTo(SnippetCounter o) { if (value > o.value) { return -1; } else if (o.value < value) { return 1; } return 0; } private static final List<Group> groups = new ArrayList<>(); private final Group group; private final int index; private final String name; private final String description; private long value; @Fold private static int countOffset() { try { return (int) Unsafe.getUnsafe().objectFieldOffset(SnippetCounter.class.getDeclaredField("value")); } catch (Exception e) { throw new GraalInternalError(e); } } /** * Creates a counter. * * @param group the group to which the counter belongs. If this is null, the newly created counter is disabled and * {@linkplain #inc() incrementing} is a no-op. * @param name the name of the counter * @param description a brief comment describing the metric represented by the counter */ public SnippetCounter(Group group, String name, String description) { this.group = group; this.name = name; this.description = description; if (group != null) { List<SnippetCounter> counters = group.counters; this.index = counters.size(); counters.add(this); if (index == 0) { groups.add(group); } } else { this.index = -1; } } /** * Increments the value of this counter. This method can be safely used in a snippet * if it is invoked on a compile-time constant {@link SnippetCounter} object. */ public void inc() { if (group != null) { DirectObjectStoreNode.storeLong(this, countOffset(), 0, value + 1); } } /** * Gets the value of this counter. */ public long value() { return value; } /** * Prints all the counter groups to a given stream. */ public static void printGroups(PrintStream out) { for (Group group : groups) { out.println(group); } } }