src/hotspot/share/jfr/recorder/stringpool/jfrStringPoolBuffer.cpp
author mgronlun
Fri, 22 Jun 2018 13:20:55 +0200
changeset 50714 2230bb152a9f
parent 50429 83aec1d357d4
child 54964 ec7d6d8effc7
permissions -rw-r--r--
8203299: StringPoolBuffer access covered by exclusive access invariant, remove (problematic) cas operations Reviewed-by: egahlin
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/*
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 * Copyright (c) 2016, 2018, 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 "jfr/recorder/stringpool/jfrStringPoolBuffer.hpp"
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JfrStringPoolBuffer::JfrStringPoolBuffer() : JfrBuffer(), _string_count_pos(0), _string_count_top(0) {}
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void JfrStringPoolBuffer::reinitialize() {
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  assert(acquired_by_self() || retired(), "invariant");
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  concurrent_top();
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  set_pos((start()));
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  set_string_pos(0);
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  set_string_top(0);
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  set_concurrent_top(start());
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}
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uint64_t JfrStringPoolBuffer::string_pos() const {
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  assert(acquired_by_self() || retired(), "invariant");
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  return _string_count_pos;
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}
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uint64_t JfrStringPoolBuffer::string_top() const {
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  assert(acquired_by_self() || retired(), "invariant");
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  return _string_count_top;
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}
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uint64_t JfrStringPoolBuffer::string_count() const {
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  assert(acquired_by_self() || retired(), "invariant");
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  return string_pos() - string_top();
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}
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void JfrStringPoolBuffer::set_string_pos(uint64_t value) {
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  assert(acquired_by_self() || retired(), "invariant");
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  _string_count_pos = value;
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}
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void JfrStringPoolBuffer::increment(uint64_t value) {
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  assert(acquired_by_self() || retired(), "invariant");
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  ++_string_count_pos;
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}
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void JfrStringPoolBuffer::set_string_top(uint64_t value) {
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  assert(acquired_by_self() || retired(), "invariant");
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  _string_count_top = value;
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}