96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
/*
|
|
* 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
|