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annotate src/share/vm/ci/ciCallProfile.hpp @ 8733:9def4075da6d

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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate(). Reviewed-by: johnc, ysr Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Tue, 05 Mar 2013 15:36:56 -0800
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children 04b9a2566eec
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1 /*
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2 * Copyright (c) 1999, 2010, 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 */
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24
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25 #ifndef SHARE_VM_CI_CICALLPROFILE_HPP
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26 #define SHARE_VM_CI_CICALLPROFILE_HPP
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27
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28 #include "ci/ciClassList.hpp"
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29 #include "memory/allocation.hpp"
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30
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31 // ciCallProfile
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32 //
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33 // This class is used to determine the frequently called method
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34 // at some call site
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35 class ciCallProfile : StackObj {
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36 private:
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37 // Fields are initialized directly by ciMethod::call_profile_at_bci.
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38 friend class ciMethod;
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39 friend class ciMethodHandle;
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40
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41 enum { MorphismLimit = 2 }; // Max call site's morphism we care about
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42 int _limit; // number of receivers have been determined
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43 int _morphism; // determined call site's morphism
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44 int _count; // # times has this call been executed
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45 int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
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46 ciMethod* _method[MorphismLimit + 1]; // receivers methods
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47 ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
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48
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49 ciCallProfile() {
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50 _limit = 0;
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51 _morphism = 0;
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52 _count = -1;
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53 _receiver_count[0] = -1;
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54 _method[0] = NULL;
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55 _receiver[0] = NULL;
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56 }
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57
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58 void add_receiver(ciKlass* receiver, int receiver_count);
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59
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60 public:
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61 // Note: The following predicates return false for invalid profiles:
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62 bool has_receiver(int i) const { return _limit > i; }
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63 int morphism() const { return _morphism; }
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64
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65 int count() const { return _count; }
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66 int receiver_count(int i) {
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67 assert(i < _limit, "out of Call Profile MorphismLimit");
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68 return _receiver_count[i];
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69 }
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70 float receiver_prob(int i) {
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71 assert(i < _limit, "out of Call Profile MorphismLimit");
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72 return (float)_receiver_count[i]/(float)_count;
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73 }
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74 ciMethod* method(int i) {
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75 assert(i < _limit, "out of Call Profile MorphismLimit");
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76 return _method[i];
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77 }
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78 ciKlass* receiver(int i) {
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79 assert(i < _limit, "out of Call Profile MorphismLimit");
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80 return _receiver[i];
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81 }
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82
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83 // Rescale the current profile based on the incoming scale
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84 ciCallProfile rescale(double scale) {
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85 assert(scale >= 0 && scale <= 1.0, "out of range");
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86 ciCallProfile call = *this;
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87 call._count = (int)(call._count * scale);
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88 for (int i = 0; i < _morphism; i++) {
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89 call._receiver_count[i] = (int)(call._receiver_count[i] * scale);
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90 }
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91 return call;
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92 }
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93 };
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95 #endif // SHARE_VM_CI_CICALLPROFILE_HPP