1 /* 2 * Copyright (c) 1999, 2010, 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_VM_CI_CICALLPROFILE_HPP 26 #define SHARE_VM_CI_CICALLPROFILE_HPP 27 28 #include "ci/ciClassList.hpp" 29 30 // ciCallProfile 31 // 32 // This class is used to determine the frequently called method 33 // at some call site 34 class ciCallProfile : StackObj { 35 private: 36 // Fields are initialized directly by ciMethod::call_profile_at_bci. 37 friend class ciMethod; 38 39 enum { MorphismLimit = 2 }; // Max call site's morphism we care about 40 int _limit; // number of receivers have been determined 41 int _morphism; // determined call site's morphism 42 int _count; // # times has this call been executed 43 int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen 44 ciMethod* _method[MorphismLimit + 1]; // receivers methods 45 ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact) 46 47 ciCallProfile() { 48 _limit = 0; 49 _morphism = 0; 50 _count = -1; 51 _receiver_count[0] = -1; 52 _method[0] = NULL; 53 _receiver[0] = NULL; 54 } 55 56 void add_receiver(ciKlass* receiver, int receiver_count); 57 58 public: 59 // Note: The following predicates return false for invalid profiles: 60 bool has_receiver(int i) { return _limit > i; } 61 int morphism() { return _morphism; } 62 63 int count() { return _count; } 64 int receiver_count(int i) { 65 assert(i < _limit, "out of Call Profile MorphismLimit"); 66 return _receiver_count[i]; 67 } 68 float receiver_prob(int i) { 69 assert(i < _limit, "out of Call Profile MorphismLimit"); 70 return (float)_receiver_count[i]/(float)_count; 71 } 72 ciMethod* method(int i) { 73 assert(i < _limit, "out of Call Profile MorphismLimit"); 74 return _method[i]; 75 } 76 ciKlass* receiver(int i) { 77 assert(i < _limit, "out of Call Profile MorphismLimit"); 78 return _receiver[i]; 79 } 80 }; 81 82 #endif // SHARE_VM_CI_CICALLPROFILE_HPP