1/*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
8 *
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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23 */
24
25#ifndef SHARE_CI_CICALLPROFILE_HPP
26#define SHARE_CI_CICALLPROFILE_HPP
27
28#include "ci/ciClassList.hpp"
29#include "memory/allocation.hpp"
30
31// ciCallProfile
32//
33// This class is used to determine the frequently called method
34// at some call site
35class ciCallProfile : StackObj {
36private:
37 // Fields are initialized directly by ciMethod::call_profile_at_bci.
38 friend class ciMethod;
39 friend class ciMethodHandle;
40
41 enum { MorphismLimit = 2 }; // Max call site's morphism we care about
42 int _limit; // number of receivers have been determined
43 int _morphism; // determined call site's morphism
44 int _count; // # times has this call been executed
45 int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
46 ciMethod* _method[MorphismLimit + 1]; // receivers methods
47 ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
48
49 ciCallProfile() {
50 _limit = 0;
51 _morphism = 0;
52 _count = -1;
53 _receiver_count[0] = -1;
54 _method[0] = NULL;
55 _receiver[0] = NULL;
56 }
57
58 void add_receiver(ciKlass* receiver, int receiver_count);
59
60public:
61 // Note: The following predicates return false for invalid profiles:
62 bool has_receiver(int i) const { return _limit > i; }
63 int morphism() const { return _morphism; }
64
65 int count() const { return _count; }
66 int receiver_count(int i) {
67 assert(i < _limit, "out of Call Profile MorphismLimit");
68 return _receiver_count[i];
69 }
70 float receiver_prob(int i) {
71 assert(i < _limit, "out of Call Profile MorphismLimit");
72 return (float)_receiver_count[i]/(float)_count;
73 }
74 ciMethod* method(int i) {
75 assert(i < _limit, "out of Call Profile MorphismLimit");
76 return _method[i];
77 }
78 ciKlass* receiver(int i) {
79 assert(i < _limit, "out of Call Profile MorphismLimit");
80 return _receiver[i];
81 }
82};
83
84#endif // SHARE_CI_CICALLPROFILE_HPP
85