author | phh |
Sat, 30 Nov 2019 14:33:05 -0800 | |
changeset 59330 | 5b96c12f909d |
parent 58863 | c16ac7a2eba4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 2019, 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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||
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#ifndef SHARE_JFR_WRITERS_JFRSTORAGEADAPTER_HPP |
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#define SHARE_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 && !_storage->excluded(); |
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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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_pos = _start; |
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return true; |
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} |
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}; |
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#endif // SHARE_JFR_WRITERS_JFRSTORAGEADAPTER_HPP |