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/*
* Copyright (c) 1999, 2006, 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.
*
*/
// 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;
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) { return _limit > i; }
int morphism() { return _morphism; }
int count() { 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];
}
};
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