ciCallProfile.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1999, 2006, 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// ciCallProfile 26// 27// This class is used to determine the frequently called method 28// at some call site 29class ciCallProfile : StackObj { 30private: 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 53public: 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}; 76