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