1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciCallProfile.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,95 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_CI_CICALLPROFILE_HPP
1.29 +#define SHARE_VM_CI_CICALLPROFILE_HPP
1.30 +
1.31 +#include "ci/ciClassList.hpp"
1.32 +#include "memory/allocation.hpp"
1.33 +
1.34 +// ciCallProfile
1.35 +//
1.36 +// This class is used to determine the frequently called method
1.37 +// at some call site
1.38 +class ciCallProfile : StackObj {
1.39 +private:
1.40 + // Fields are initialized directly by ciMethod::call_profile_at_bci.
1.41 + friend class ciMethod;
1.42 + friend class ciMethodHandle;
1.43 +
1.44 + enum { MorphismLimit = 2 }; // Max call site's morphism we care about
1.45 + int _limit; // number of receivers have been determined
1.46 + int _morphism; // determined call site's morphism
1.47 + int _count; // # times has this call been executed
1.48 + int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
1.49 + ciMethod* _method[MorphismLimit + 1]; // receivers methods
1.50 + ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
1.51 +
1.52 + ciCallProfile() {
1.53 + _limit = 0;
1.54 + _morphism = 0;
1.55 + _count = -1;
1.56 + _receiver_count[0] = -1;
1.57 + _method[0] = NULL;
1.58 + _receiver[0] = NULL;
1.59 + }
1.60 +
1.61 + void add_receiver(ciKlass* receiver, int receiver_count);
1.62 +
1.63 +public:
1.64 + // Note: The following predicates return false for invalid profiles:
1.65 + bool has_receiver(int i) const { return _limit > i; }
1.66 + int morphism() const { return _morphism; }
1.67 +
1.68 + int count() const { return _count; }
1.69 + int receiver_count(int i) {
1.70 + assert(i < _limit, "out of Call Profile MorphismLimit");
1.71 + return _receiver_count[i];
1.72 + }
1.73 + float receiver_prob(int i) {
1.74 + assert(i < _limit, "out of Call Profile MorphismLimit");
1.75 + return (float)_receiver_count[i]/(float)_count;
1.76 + }
1.77 + ciMethod* method(int i) {
1.78 + assert(i < _limit, "out of Call Profile MorphismLimit");
1.79 + return _method[i];
1.80 + }
1.81 + ciKlass* receiver(int i) {
1.82 + assert(i < _limit, "out of Call Profile MorphismLimit");
1.83 + return _receiver[i];
1.84 + }
1.85 +
1.86 + // Rescale the current profile based on the incoming scale
1.87 + ciCallProfile rescale(double scale) {
1.88 + assert(scale >= 0 && scale <= 1.0, "out of range");
1.89 + ciCallProfile call = *this;
1.90 + call._count = (int)(call._count * scale);
1.91 + for (int i = 0; i < _morphism; i++) {
1.92 + call._receiver_count[i] = (int)(call._receiver_count[i] * scale);
1.93 + }
1.94 + return call;
1.95 + }
1.96 +};
1.97 +
1.98 +#endif // SHARE_VM_CI_CICALLPROFILE_HPP
