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72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (c) 1997, 2023, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "compiler/compiler_globals.hpp"
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#include "interpreter/invocationCounter.hpp"
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void InvocationCounter::init() {
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_counter = 0; // reset all the bits, including the sticky carry
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}
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void InvocationCounter::set(uint count, uint flag) {
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_counter = (count << number_of_noncount_bits) | (flag & carry_mask);
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}
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void InvocationCounter::set(uint count) {
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uint carry = (_counter & carry_mask); // the carry bit is sticky
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_counter = (count << number_of_noncount_bits) | carry;
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}
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void InvocationCounter::update(uint new_count) {
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// Don't make the method look like it's never been executed
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uint counter = raw_counter();
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uint c = extract_count(counter);
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uint f = extract_carry(counter);
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// prevent from going to zero, to distinguish from never-executed methods
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if (c > 0 && new_count == 0) new_count = 1;
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set(new_count, f);
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}
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void InvocationCounter::set_carry_on_overflow() {
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if (!carry() && count() > InvocationCounter::count_limit / 2) {
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set_carry();
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}
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}
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void InvocationCounter::reset() {
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update(0);
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}
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void InvocationCounter::decay() {
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update(count() >> 1);
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}
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void InvocationCounter::print() {
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uint counter = raw_counter();
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tty->print_cr("invocation count: up = %d, limit = " INTX_FORMAT ", carry = %s",
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extract_count(counter), limit(),
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extract_carry(counter) ? "true" : "false");
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}
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