Mercurial > hg > truffle
annotate src/share/vm/ci/ciCallProfile.hpp @ 3752:f918d6096e23
7050554: JSR 292 - need optimization for selectAlternative
Reviewed-by: kvn, jrose
| author | never |
|---|---|
| date | Thu, 02 Jun 2011 13:36:11 -0700 |
| parents | c760f78e0a53 |
| children | be4ca325525a c26de9aef2ed |
| rev | line source |
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| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CI_CICALLPROFILE_HPP |
| 26 #define SHARE_VM_CI_CICALLPROFILE_HPP | |
| 27 | |
| 28 #include "ci/ciClassList.hpp" | |
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29 #include "memory/allocation.hpp" |
| 1972 | 30 |
| 0 | 31 // ciCallProfile |
| 32 // | |
| 33 // This class is used to determine the frequently called method | |
| 34 // at some call site | |
| 35 class ciCallProfile : StackObj { | |
| 36 private: | |
| 37 // Fields are initialized directly by ciMethod::call_profile_at_bci. | |
| 38 friend class ciMethod; | |
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39 friend class ciMethodHandle; |
| 0 | 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 | |
| 60 public: | |
| 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; } |
| 0 | 64 |
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65 int count() const { return _count; } |
| 0 | 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 }; | |
| 1972 | 83 |
| 84 #endif // SHARE_VM_CI_CICALLPROFILE_HPP |