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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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#ifndef SHARE_VM_JFR_WRITERS_JFRSTORAGEADAPTER_HPP
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#define SHARE_VM_JFR_WRITERS_JFRSTORAGEADAPTER_HPP
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#include "jfr/utilities/jfrAllocation.hpp"
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class Thread;
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//
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// The adapters present writers with a uniform interface over storage.
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//
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// Adapter policy
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//
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// StorageType* storage();
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// const u1* start() const;
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// const u1* pos();
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// const u1* end() const;
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// void commit(u1* position);
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// bool flush(size_t used, size_t requested);
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// void release();
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//
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template <typename Flush>
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class Adapter {
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public:
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typedef typename Flush::Type StorageType;
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Adapter(StorageType* storage, Thread* thread) : _storage(storage), _thread(thread) {}
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Adapter(Thread* thread) : _storage(NULL), _thread(thread) {}
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void set_storage(StorageType* storage) {
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_storage = storage;
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}
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StorageType* storage() {
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return _storage;
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}
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const u1* start() const {
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assert(_storage != NULL, "invariant");
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return _storage->start();
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}
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u1* pos() {
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assert(_storage != NULL, "invariant");
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return _storage->pos();
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}
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const u1* end() const {
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assert(_storage != NULL, "invariant");
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return _storage->end();
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}
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void commit(u1* position) {
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assert(_storage != NULL, "invariant");
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_storage->set_pos(position);
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}
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bool flush(size_t used, size_t requested) {
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assert(_thread != NULL, "invariant");
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Flush f(_storage, used, requested, _thread);
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_storage = f.result();
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return _storage != NULL;
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}
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void release() {
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if (_storage != NULL && _storage->lease()) {
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// This flush call will return the lease
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// of a temporary storage area.
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// Since the requested size is 0,
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// the flush implementation will accomodate
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// that 'size' request in the
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// original thread local storage,
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// by implication restoring the original
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// in the process of returning a lease.
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flush(0, 0);
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}
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}
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private:
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StorageType* _storage;
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Thread* _thread;
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};
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template <size_t DEFAULT_SIZE = K>
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class MallocAdapter {
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private:
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u1* _start;
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u1* _pos;
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u1* _end;
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size_t _initial_size;
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bool _has_ownership;
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bool allocate(size_t size);
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void deallocate();
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public:
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typedef u1 StorageType;
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MallocAdapter(u1* storage, Thread* thread);
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MallocAdapter(u1* storage, size_t size);
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MallocAdapter(Thread* thread);
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~MallocAdapter();
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StorageType* storage() { return _start; }
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const u1* start() const { return _start; }
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u1* pos() { return _pos; }
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void commit(u1* position) { _pos = position; }
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const u1* end() const { return _end; }
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void release() {}
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bool flush(size_t used, size_t requested);
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};
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template <size_t DEFAULT_SIZE>
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MallocAdapter<DEFAULT_SIZE>::MallocAdapter(u1* storage, size_t size) :
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_start(storage),
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_pos(storage),
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_end(storage + size),
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_initial_size(size),
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_has_ownership(false) {
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}
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template <size_t DEFAULT_SIZE>
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MallocAdapter<DEFAULT_SIZE> ::MallocAdapter(u1* storage, Thread* thread) :
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_start(storage),
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_pos(storage),
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_end(storage),
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_initial_size(0),
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_has_ownership(false) {
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}
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template <size_t DEFAULT_SIZE>
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MallocAdapter<DEFAULT_SIZE>::MallocAdapter(Thread* thread) :
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_start(NULL),
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_pos(NULL),
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_end(NULL),
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_initial_size(DEFAULT_SIZE),
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_has_ownership(true) {
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allocate(DEFAULT_SIZE);
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}
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template <size_t DEFAULT_SIZE>
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MallocAdapter<DEFAULT_SIZE>::~MallocAdapter() {
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if (_has_ownership) {
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deallocate();
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}
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}
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template <size_t DEFAULT_SIZE>
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bool MallocAdapter<DEFAULT_SIZE>::allocate(size_t size) {
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if (NULL == _start) {
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_start = JfrCHeapObj::new_array<u1>(size);
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if (_start) {
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_pos = _start;
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_end = _start + size;
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_initial_size = size;
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}
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}
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return _start != NULL;
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}
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template <size_t DEFAULT_SIZE>
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void MallocAdapter<DEFAULT_SIZE>::deallocate() {
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if (_start != NULL) {
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JfrCHeapObj::free(_start, (size_t)(_end - _start));
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}
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}
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template <size_t DEFAULT_SIZE>
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bool MallocAdapter<DEFAULT_SIZE>::flush(size_t used, size_t requested) {
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if (!_has_ownership) {
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// can't just realloc a storage that we don't own
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return false;
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}
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assert(_start != NULL, "invariant");
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assert(used <= (size_t)(_end - _pos), "invariant");
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assert(_pos + used <= _end, "invariant");
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const size_t previous_storage_size = _end - _start;
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const size_t new_storage_size = used + requested + (previous_storage_size * 2);
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u1* const new_storage = JfrCHeapObj::new_array<u1>(new_storage_size);
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if (!new_storage) {
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return false;
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}
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const size_t previous_pos_offset = _pos - _start;
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// migrate in-flight data
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memcpy(new_storage, _start, previous_pos_offset + used);
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JfrCHeapObj::free(_start, previous_storage_size);
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_start = new_storage;
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_pos = _start + previous_pos_offset;
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_end = _start + new_storage_size;
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return true;
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}
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class NoOwnershipAdapter {
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private:
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u1* _start;
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u1* _pos;
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u1* _end;
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size_t _size;
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public:
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typedef u1 StorageType;
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NoOwnershipAdapter(u1* storage, size_t size) : _start(storage), _pos(storage), _end(storage + size), _size(size) {}
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NoOwnershipAdapter(u1* storage, Thread* thread) : _start(storage), _pos(storage), _end(storage), _size(0) {
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ShouldNotCallThis();
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}
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NoOwnershipAdapter(Thread* thread) : _start(NULL), _pos(NULL), _end(NULL), _size(0) {
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ShouldNotCallThis();
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}
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StorageType* storage() { return _start; }
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const u1* start() const { return _start; }
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u1* pos() { return _pos; }
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void commit(u1* position) { _pos = position; }
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const u1* end() const { return _end; }
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void release() {}
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bool flush(size_t used, size_t requested) {
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// don't flush/expand a buffer that is not our own
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return false;
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}
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};
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#endif // SHARE_VM_JFR_WRITERS_JFRSTORAGEADAPTER_HPP
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