--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/utilities/events.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * 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).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "memory/allocation.inline.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/os.inline.hpp"
+#include "runtime/osThread.hpp"
+#include "runtime/thread.inline.hpp"
+#include "runtime/threadCritical.hpp"
+#include "runtime/timer.hpp"
+#include "utilities/events.hpp"
+
+
+EventLog* Events::_logs = NULL;
+StringEventLog* Events::_messages = NULL;
+StringEventLog* Events::_exceptions = NULL;
+StringEventLog* Events::_redefinitions = NULL;
+StringEventLog* Events::_deopt_messages = NULL;
+
+EventLog::EventLog() {
+  // This normally done during bootstrap when we're only single
+  // threaded but use a ThreadCritical to ensure inclusion in case
+  // some are created slightly late.
+  ThreadCritical tc;
+  _next = Events::_logs;
+  Events::_logs = this;
+}
+
+// For each registered event logger, print out the current contents of
+// the buffer.  This is normally called when the JVM is crashing.
+void Events::print_all(outputStream* out) {
+  EventLog* log = _logs;
+  while (log != NULL) {
+    log->print_log_on(out);
+    log = log->next();
+  }
+}
+
+void Events::print() {
+  print_all(tty);
+}
+
+void Events::init() {
+  if (LogEvents) {
+    _messages = new StringEventLog("Events");
+    _exceptions = new StringEventLog("Internal exceptions");
+    _redefinitions = new StringEventLog("Classes redefined");
+    _deopt_messages = new StringEventLog("Deoptimization events");
+  }
+}
+
+void eventlog_init() {
+  Events::init();
+}
+
+///////////////////////////////////////////////////////////////////////////
+// EventMark
+
+EventMark::EventMark(const char* format, ...) {
+  if (LogEvents) {
+    va_list ap;
+    va_start(ap, format);
+    // Save a copy of begin message and log it.
+    _buffer.printv(format, ap);
+    Events::log(NULL, "%s", _buffer.buffer());
+    va_end(ap);
+  }
+}
+
+EventMark::~EventMark() {
+  if (LogEvents) {
+    // Append " done" to the begin message and log it
+    _buffer.append(" done");
+    Events::log(NULL, "%s", _buffer.buffer());
+  }
+}