1 /* 2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_JFR_WRITERS_JFRSTORAGEHOST_INLINE_HPP 26 #define SHARE_VM_JFR_WRITERS_JFRSTORAGEHOST_INLINE_HPP 27 28 #include "jfr/writers/jfrStorageHost.hpp" 29 30 template <typename Adapter, typename AP> 31 inline void StorageHost<Adapter, AP>::bind() { 32 if (is_backed()) { 33 this->hard_reset(); 34 assert(is_valid(), "invariant"); 35 return; 36 } 37 this->set_start_pos(NULL); 38 this->set_current_pos((const u1*)NULL); 39 this->set_end_pos(NULL); 40 } 41 42 template <typename Adapter, typename AP> 43 inline void StorageHost<Adapter, AP>::soft_reset() { 44 this->set_start_pos(this->current_pos()); 45 } 46 47 template <typename Adapter, typename AP> 48 inline void StorageHost<Adapter, AP>::hard_reset() { 49 this->set_start_pos(_adapter.pos()); 50 this->set_current_pos(_adapter.pos()); 51 this->set_end_pos(_adapter.end()); 52 } 53 54 template <typename Adapter, typename AP> 55 inline void StorageHost<Adapter, AP>::cancel() { 56 this->set_end_pos(NULL); 57 } 58 59 template <typename Adapter, typename AP> 60 inline bool StorageHost<Adapter, AP>::is_backed() { 61 return _adapter.storage() != NULL; 62 } 63 64 template <typename Adapter, typename AP> 65 inline bool StorageHost<Adapter, AP>::accommodate(size_t used, size_t requested) { 66 if (!_adapter.flush(used, requested)) { 67 this->cancel(); 68 return false; 69 } 70 assert(is_backed(), "invariant"); 71 this->hard_reset(); 72 this->set_current_pos(used); 73 return true; 74 } 75 76 template <typename Adapter, typename AP> 77 inline void StorageHost<Adapter, AP>::commit() { 78 if (this->is_valid()) { 79 assert(_adapter.pos() == this->start_pos(), "invariant"); 80 assert(_adapter.end() == this->end_pos(), "invariant"); 81 u1* new_position = this->current_pos(); 82 _adapter.commit(new_position); 83 this->set_start_pos(new_position); 84 } 85 } 86 87 template <typename Adapter, typename AP> 88 inline void StorageHost<Adapter, AP>::release() { 89 _adapter.release(); 90 } 91 92 template <typename Adapter, typename AP> 93 inline StorageHost<Adapter, AP>::StorageHost(typename Adapter::StorageType* storage, Thread* thread) : Position<AP>(), _adapter(storage, thread) { 94 bind(); 95 } 96 97 template <typename Adapter, typename AP> 98 inline StorageHost<Adapter, AP>::StorageHost(typename Adapter::StorageType* storage, size_t size) : Position<AP>(), _adapter(storage, size) { 99 bind(); 100 } 101 102 template <typename Adapter, typename AP> 103 inline StorageHost<Adapter, AP>::StorageHost(Thread* thread) : Position<AP>(), _adapter(thread) { 104 bind(); 105 } 106 107 template <typename Adapter, typename AP> 108 inline bool StorageHost<Adapter, AP>::is_valid() const { 109 return this->end_pos() != NULL; 110 } 111 112 template <typename Adapter, typename AP> 113 inline typename Adapter::StorageType* StorageHost<Adapter, AP>::storage() { 114 return _adapter.storage(); 115 } 116 117 template <typename Adapter, typename AP> 118 inline void StorageHost<Adapter, AP>::set_storage(typename Adapter::StorageType* storage) { 119 _adapter.set_storage(storage); 120 bind(); 121 } 122 123 template <typename Adapter, typename AP> 124 inline void StorageHost<Adapter, AP>::flush() { 125 this->accommodate(this->is_valid() ? this->used_size() : 0, 0); 126 } 127 128 template <typename Adapter, typename AP> 129 inline void StorageHost<Adapter, AP>::seek(intptr_t offset) { 130 if (this->is_valid()) { 131 assert(offset >= 0, "negative offsets not supported"); 132 assert(this->start_pos() + offset <= this->end_pos(), "invariant"); 133 assert(this->start_pos() + offset >= this->start_pos(), "invariant"); 134 this->set_current_pos(this->start_pos() + offset); 135 } 136 } 137 138 #endif // SHARE_VM_JFR_WRITERS_JFRSTORAGEHOST_INLINE_HPP