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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ri/RiTypeProfile.java @ 5346:4c3d953f8131

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added mechanism (enabled by -G:PICache and -G:PiFilter) for saving/loading method profiling info to/from disk
author Doug Simon <doug.simon@oracle.com>
date Thu, 03 May 2012 13:39:45 +0200
parents 439ca5ecc7dc
children 2e9a5365dfb0
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.max.cri.ri;
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24
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25 import java.io.*;
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26
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27 /**
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28 * This profile object represents the type profile at a specific BCI. The precision of the supplied values may vary,
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29 * but a runtime that provides this information should be aware that it will be used to guide performance-critical
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30 * decisions like speculative inlining, etc.
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31 */
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32 public final class RiTypeProfile implements Serializable {
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33
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34 private static final long serialVersionUID = -6877016333706838441L;
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35
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36 /**
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37 * A profiled type that has a probability. Profiled types are naturally sorted in
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38 * descending order of their probabilities.
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39 */
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40 public static class ProfiledType implements Comparable<ProfiledType>, Serializable {
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41 private static final long serialVersionUID = 7838575753661305744L;
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42 public final RiResolvedType type;
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43 public final double probability;
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44
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45 public ProfiledType(RiResolvedType type, double probability) {
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46 this.type = type;
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47 this.probability = probability;
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48 }
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49
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50 @Override
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51 public int compareTo(ProfiledType o) {
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52 if (probability > o.probability) {
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53 return -1;
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54 } else if (probability < o.probability) {
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55 return 1;
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56 }
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57 return 0;
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58 }
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59 }
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60
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61 private final double notRecordedProbability;
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62 private final ProfiledType[] ptypes;
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63
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64 /**
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65 * Determines if an array of profiled types are sorted in descending order of their probabilities.
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66 */
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67 public static boolean isSorted(ProfiledType[] ptypes) {
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68 for (int i = 1; i < ptypes.length; i++) {
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69 if (ptypes[i - 1].probability < ptypes[i].probability) {
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70 return false;
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71 }
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72 }
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73 return true;
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74 }
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75
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76 public RiTypeProfile(ProfiledType[] ptypes, double notRecordedProbability) {
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77 this.ptypes = ptypes;
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78 this.notRecordedProbability = notRecordedProbability;
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79 assert isSorted(ptypes);
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80 }
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81
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82 /**
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83 * Returns the estimated probability of all types that could not be recorded due to profiling limitations.
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84 * @return double value >= 0.0 and <= 1.0
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85 */
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86 public double getNotRecordedProbability() {
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87 return notRecordedProbability;
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88 }
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89
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90 /**
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91 * A list of types for which the runtime has recorded probability information.
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92 */
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93 public ProfiledType[] getTypes() {
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94 return ptypes;
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95 }
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96 }