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. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 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 35 class ciCallProfile : StackObj { 36 private: 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 60 public: 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