| /* |
| * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_CI_CICALLPROFILE_HPP |
| #define SHARE_VM_CI_CICALLPROFILE_HPP |
| |
| #include "ci/ciClassList.hpp" |
| #include "memory/allocation.hpp" |
| |
| // ciCallProfile |
| // |
| // This class is used to determine the frequently called method |
| // at some call site |
| class ciCallProfile : StackObj { |
| private: |
| // Fields are initialized directly by ciMethod::call_profile_at_bci. |
| friend class ciMethod; |
| friend class ciMethodHandle; |
| |
| enum { MorphismLimit = 2 }; // Max call site's morphism we care about |
| int _limit; // number of receivers have been determined |
| int _morphism; // determined call site's morphism |
| int _count; // # times has this call been executed |
| int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen |
| ciMethod* _method[MorphismLimit + 1]; // receivers methods |
| ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact) |
| |
| ciCallProfile() { |
| _limit = 0; |
| _morphism = 0; |
| _count = -1; |
| _receiver_count[0] = -1; |
| _method[0] = NULL; |
| _receiver[0] = NULL; |
| } |
| |
| void add_receiver(ciKlass* receiver, int receiver_count); |
| |
| public: |
| // Note: The following predicates return false for invalid profiles: |
| bool has_receiver(int i) const { return _limit > i; } |
| int morphism() const { return _morphism; } |
| |
| int count() const { return _count; } |
| int receiver_count(int i) { |
| assert(i < _limit, "out of Call Profile MorphismLimit"); |
| return _receiver_count[i]; |
| } |
| float receiver_prob(int i) { |
| assert(i < _limit, "out of Call Profile MorphismLimit"); |
| return (float)_receiver_count[i]/(float)_count; |
| } |
| ciMethod* method(int i) { |
| assert(i < _limit, "out of Call Profile MorphismLimit"); |
| return _method[i]; |
| } |
| ciKlass* receiver(int i) { |
| assert(i < _limit, "out of Call Profile MorphismLimit"); |
| return _receiver[i]; |
| } |
| |
| // Rescale the current profile based on the incoming scale |
| ciCallProfile rescale(double scale) { |
| assert(scale >= 0 && scale <= 1.0, "out of range"); |
| ciCallProfile call = *this; |
| call._count = (int)(call._count * scale); |
| for (int i = 0; i < _morphism; i++) { |
| call._receiver_count[i] = (int)(call._receiver_count[i] * scale); |
| } |
| return call; |
| } |
| }; |
| |
| #endif // SHARE_VM_CI_CICALLPROFILE_HPP |