jvmtiError
JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
                                 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) {

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      jvmtiError err = JVMTI_ERROR_NONE;
    #ifdef ASSERT
      uint32_t debug_bits = 0;
    #endif

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert((SafepointSynchronize::is_at_safepoint() ||
              is_thread_fully_suspended(java_thread, false, &debug_bits)),
             "at safepoint or target thread is suspended");

  {- -------------------------------------------
  (1) 処理対象のスレッド(java_thread)のスタックフレームを辿る.
      その中で JvmtiEnvBase::get_locked_objects_in_frame() を呼び出し, 取得しているモニターの情報を取得していく.
      ---------------------------------------- -}

      if (java_thread->has_last_Java_frame()) {
        ResourceMark rm;
        HandleMark   hm;
        RegisterMap  reg_map(java_thread);

        int depth = 0;
        for (javaVFrame *jvf = java_thread->last_java_vframe(&reg_map); jvf != NULL;
             jvf = jvf->java_sender()) {
          if (depth++ < MaxJavaStackTraceDepth) {  // check for stack too deep
            // add locked objects for this frame into list
            err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1);
            if (err != JVMTI_ERROR_NONE) {
              return err;
            }
          }
        }
      }

  {- -------------------------------------------
  (1) JvmtiMonitorClosure を引数として
      ObjectSynchronizer::monitors_iterate() を呼び出し, 
      jni の MonitorEnter() で取得されたモニターの情報も取得しておく.
      ---------------------------------------- -}

      // Get off stack monitors. (e.g. acquired via jni MonitorEnter).
      JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this);
      ObjectSynchronizer::monitors_iterate(&jmc);
      err = jmc.error();

  {- -------------------------------------------
  (1) リターン
      ---------------------------------------- -}

      return err;
    }