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comparison src/share/vm/ci/ciCallProfile.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
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.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // ciCallProfile
26 //
27 // This class is used to determine the frequently called method
28 // at some call site
29 class ciCallProfile : StackObj {
30 private:
31 // Fields are initialized directly by ciMethod::call_profile_at_bci.
32 friend class ciMethod;
33
34 enum { MorphismLimit = 2 }; // Max call site's morphism we care about
35 int _limit; // number of receivers have been determined
36 int _morphism; // determined call site's morphism
37 int _count; // # times has this call been executed
38 int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
39 ciMethod* _method[MorphismLimit + 1]; // receivers methods
40 ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
41
42 ciCallProfile() {
43 _limit = 0;
44 _morphism = 0;
45 _count = -1;
46 _receiver_count[0] = -1;
47 _method[0] = NULL;
48 _receiver[0] = NULL;
49 }
50
51 void add_receiver(ciKlass* receiver, int receiver_count);
52
53 public:
54 // Note: The following predicates return false for invalid profiles:
55 bool has_receiver(int i) { return _limit > i; }
56 int morphism() { return _morphism; }
57
58 int count() { return _count; }
59 int receiver_count(int i) {
60 assert(i < _limit, "out of Call Profile MorphismLimit");
61 return _receiver_count[i];
62 }
63 float receiver_prob(int i) {
64 assert(i < _limit, "out of Call Profile MorphismLimit");
65 return (float)_receiver_count[i]/(float)_count;
66 }
67 ciMethod* method(int i) {
68 assert(i < _limit, "out of Call Profile MorphismLimit");
69 return _method[i];
70 }
71 ciKlass* receiver(int i) {
72 assert(i < _limit, "out of Call Profile MorphismLimit");
73 return _receiver[i];
74 }
75 };