1 /*
   2  * Copyright (c) 2016, 2018, 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_JFREVENTWRITERHOST_INLINE_HPP
  26 #define SHARE_VM_JFR_WRITERS_JFREVENTWRITERHOST_INLINE_HPP
  27 
  28 #include "jfr/writers/jfrEventWriterHost.hpp"
  29 
  30 template <typename BE, typename IE, typename WriterPolicyImpl>
  31 template <typename StorageType>
  32 inline EventWriterHost<BE, IE, WriterPolicyImpl>::
  33 EventWriterHost(StorageType* storage, Thread* thread) : WriterHost<BE, IE, WriterPolicyImpl>(storage, thread) {}
  34 
  35 template <typename BE, typename IE, typename WriterPolicyImpl>
  36 inline EventWriterHost<BE, IE, WriterPolicyImpl>::EventWriterHost(Thread* thread) : WriterHost<BE, IE, WriterPolicyImpl>(thread) {
  37 }
  38 
  39 template <typename BE, typename IE, typename WriterPolicyImpl>
  40 inline void EventWriterHost<BE, IE, WriterPolicyImpl>::begin_write() {
  41   assert(this->is_valid(), "invariant");
  42   assert(!this->is_acquired(), "calling begin with writer already in acquired state!");
  43   this->acquire();
  44   assert(this->used_offset() == 0, "invariant");
  45   assert(this->is_acquired(), "invariant");
  46 }
  47 
  48 template <typename BE, typename IE, typename WriterPolicyImpl>
  49 inline intptr_t EventWriterHost<BE, IE, WriterPolicyImpl>::end_write(void) {
  50   assert(this->is_acquired(),
  51     "state corruption, calling end with writer with non-acquired state!");
  52   return this->is_valid() ? this->used_offset() : 0;
  53 }
  54 
  55 template <typename BE, typename IE, typename WriterPolicyImpl>
  56 inline void EventWriterHost<BE, IE, WriterPolicyImpl>::begin_event_write() {
  57   assert(this->is_valid(), "invariant");
  58   assert(!this->is_acquired(), "calling begin with writer already in acquired state!");
  59   this->begin_write();
  60   this->reserve(sizeof(u4)); // reserve the event size slot
  61 }
  62 
  63 template <typename BE, typename IE, typename WriterPolicyImpl>
  64 inline intptr_t EventWriterHost<BE, IE, WriterPolicyImpl>::end_event_write() {
  65   assert(this->is_acquired(), "invariant");
  66   if (!this->is_valid()) {
  67     this->release();
  68     return 0;
  69   }
  70   const u4 written = (u4)end_write();
  71   if (written > sizeof(u4)) { // larger than header reserve
  72     this->write_padded_at_offset(written, 0);
  73     this->commit();
  74   }
  75   this->release();
  76   assert(!this->is_acquired(), "invariant");
  77   return written;
  78 }
  79 
  80 template <typename BE, typename IE, typename WriterPolicyImpl>
  81 template <typename StorageType>
  82 inline StackEventWriterHost<BE, IE, WriterPolicyImpl>::
  83 StackEventWriterHost(StorageType* storage, Thread* thread) : EventWriterHost<BE, IE, WriterPolicyImpl>(storage, thread) {
  84   this->begin_event_write();
  85 }
  86 
  87 template <typename BE, typename IE, typename WriterPolicyImpl>
  88 inline StackEventWriterHost<BE, IE, WriterPolicyImpl>::StackEventWriterHost(Thread* thread) : EventWriterHost<BE, IE, WriterPolicyImpl>(thread) {
  89   this->begin_event_write();
  90 }
  91 
  92 template <typename BE, typename IE, typename WriterPolicyImpl>
  93 inline StackEventWriterHost<BE, IE, WriterPolicyImpl>::~StackEventWriterHost() {
  94   this->end_event_write();
  95 }
  96 
  97 #endif // SHARE_VM_JFR_WRITERS_JFREVENTWRITERHOST_INLINE_HPP