Mercurial > hg > graal-compiler
view src/share/vm/ci/ciCallProfile.hpp @ 21696:ca140f8c35be
Empty pointer stamps are also non-null.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 03 Jun 2015 14:08:29 +0200 |
parents | b8f261ba79c6 |
children |
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/* * 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