76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
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/*
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* Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// ciCallProfile
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//
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// This class is used to determine the frequently called method
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// at some call site
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class ciCallProfile : StackObj {
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private:
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// Fields are initialized directly by ciMethod::call_profile_at_bci.
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friend class ciMethod;
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enum { MorphismLimit = 2 }; // Max call site's morphism we care about
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int _limit; // number of receivers have been determined
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int _morphism; // determined call site's morphism
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int _count; // # times has this call been executed
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int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
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ciMethod* _method[MorphismLimit + 1]; // receivers methods
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ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
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ciCallProfile() {
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_limit = 0;
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_morphism = 0;
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_count = -1;
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_receiver_count[0] = -1;
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_method[0] = NULL;
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_receiver[0] = NULL;
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}
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void add_receiver(ciKlass* receiver, int receiver_count);
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public:
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// Note: The following predicates return false for invalid profiles:
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bool has_receiver(int i) { return _limit > i; }
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int morphism() { return _morphism; }
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int count() { return _count; }
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int receiver_count(int i) {
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assert(i < _limit, "out of Call Profile MorphismLimit");
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return _receiver_count[i];
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}
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float receiver_prob(int i) {
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assert(i < _limit, "out of Call Profile MorphismLimit");
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return (float)_receiver_count[i]/(float)_count;
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}
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ciMethod* method(int i) {
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assert(i < _limit, "out of Call Profile MorphismLimit");
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return _method[i];
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}
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ciKlass* receiver(int i) {
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assert(i < _limit, "out of Call Profile MorphismLimit");
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return _receiver[i];
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}
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};
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