JDK14/Java14源码在线阅读

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef SHARE_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP
#define SHARE_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP

#include "jfr/recorder/stacktrace/jfrStackTrace.hpp"
#include "jfr/utilities/jfrAllocation.hpp"
#include "jfr/utilities/jfrTypes.hpp"

class JavaThread;
class JfrCheckpointWriter;
class JfrChunkWriter;

class JfrStackTraceRepository : public JfrCHeapObj {
  friend class JfrRecorder;
  friend class JfrRecorderService;
  friend class JfrThreadSampleClosure;
  friend class ObjectSampleCheckpoint;
  friend class ObjectSampler;
  friend class StackTraceBlobInstaller;
  friend class StackTraceRepository;

 private:
  static const u4 TABLE_SIZE = 2053;
  JfrStackTrace* _table[TABLE_SIZE];
  traceid _next_id;
  u4 _entries;

  JfrStackTraceRepository();
  static JfrStackTraceRepository& instance();
  static JfrStackTraceRepository* create();
  static void destroy();
  bool initialize();

  bool is_modified() const;
  size_t write(JfrChunkWriter& cw, bool clear);
  size_t clear();

  const JfrStackTrace* lookup(unsigned int hash, traceid id) const;

  traceid add_trace(const JfrStackTrace& stacktrace);
  static traceid add(const JfrStackTrace& stacktrace);

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