jdk

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/*
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 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc/shared/gc_globals.hpp"
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#include "memory/allocation.inline.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/symbol.hpp"
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#include "runtime/javaThread.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/threadCritical.hpp"
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#include "runtime/timer.hpp"
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#include "utilities/events.hpp"
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EventLog* Events::_logs = nullptr;
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StringEventLog* Events::_messages = nullptr;
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StringEventLog* Events::_memprotect_messages = nullptr;
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StringEventLog* Events::_nmethod_flush_messages = nullptr;
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StringEventLog* Events::_vm_operations = nullptr;
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StringEventLog* Events::_zgc_phase_switch = nullptr;
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ExceptionsEventLog* Events::_exceptions = nullptr;
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StringEventLog* Events::_redefinitions = nullptr;
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UnloadingEventLog* Events::_class_unloading = nullptr;
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StringEventLog* Events::_class_loading = nullptr;
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StringEventLog* Events::_deopt_messages = nullptr;
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StringEventLog* Events::_dll_messages = nullptr;
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EventLog::EventLog() {
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  // This normally done during bootstrap when we're only single
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  // threaded but use a ThreadCritical to ensure inclusion in case
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  // some are created slightly late.
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  ThreadCritical tc;
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  _next = Events::_logs;
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  Events::_logs = this;
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}
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// For each registered event logger, print out the current contents of
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// the buffer.
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void Events::print_all(outputStream* out, int max) {
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  EventLog* log = _logs;
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  while (log != nullptr) {
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    log->print_log_on(out, max);
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    log = log->next();
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  }
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}
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// Print a single event log specified by name.
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void Events::print_one(outputStream* out, const char* log_name, int max) {
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  EventLog* log = _logs;
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  int num_printed = 0;
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  while (log != nullptr) {
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    if (log->matches_name_or_handle(log_name)) {
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      log->print_log_on(out, max);
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      num_printed ++;
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    }
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    log = log->next();
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  }
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  // Write a short error note if no name matched.
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  if (num_printed == 0) {
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    out->print_cr("The name \"%s\" did not match any known event log. "
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                  "Valid event log names are:", log_name);
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    EventLog* log = _logs;
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    while (log != nullptr) {
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      log->print_names(out);
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      out->cr();
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      log = log->next();
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    }
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  }
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}
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void Events::print() {
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  print_all(tty);
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}
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void Events::init() {
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  if (LogEvents) {
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    _messages = new StringEventLog("Events", "events");
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    _nmethod_flush_messages = new StringEventLog("Nmethod flushes", "nmethodflushes");
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    _memprotect_messages = new StringEventLog("Memory protections", "memprotects");
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    _vm_operations = new StringEventLog("VM Operations", "vmops");
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    if (UseZGC) {
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      _zgc_phase_switch = new StringEventLog("ZGC Phase Switch", "zgcps");
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    }
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    _exceptions = new ExceptionsEventLog("Internal exceptions", "exc");
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    _redefinitions = new StringEventLog("Classes redefined", "redef");
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    _class_unloading = new UnloadingEventLog("Classes unloaded", "unload");
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    _class_loading = new StringEventLog("Classes loaded", "load");
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    _deopt_messages = new StringEventLog("Deoptimization events", "deopt");
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    _dll_messages = new StringEventLog("Dll operation events", "dll");
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  }
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}
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void eventlog_init() {
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  Events::init();
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}
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///////////////////////////////////////////////////////////////////////////
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// EventMark
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EventMarkBase::EventMarkBase(EventLogFunction log_function) :
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    _log_function(log_function),
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    _buffer() {}
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void EventMarkBase::log_start(const char* format, va_list argp) {
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  // Save a copy of begin message and log it.
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  _buffer.printv(format, argp);
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  _log_function(nullptr, "%s", _buffer.buffer());
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}
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void EventMarkBase::log_end() {
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  // Append " done" to the begin message and log it
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  _buffer.append(" done");
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  _log_function(nullptr, "%s", _buffer.buffer());
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}
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void UnloadingEventLog::log(Thread* thread, InstanceKlass* ik) {
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  if (!should_log()) return;
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  double timestamp = fetch_timestamp();
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  // Unloading events are single threaded.
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  int index = compute_log_index();
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  _records[index].thread = thread;
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  _records[index].timestamp = timestamp;
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  stringStream st(_records[index].data.buffer(),
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                  _records[index].data.size());
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  st.print("Unloading class " PTR_FORMAT " ", p2i(ik));
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  ik->name()->print_value_on(&st);
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}
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void ExceptionsEventLog::log(Thread* thread, Handle h_exception, const char* message, const char* file, int line) {
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  if (!should_log()) return;
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  double timestamp = fetch_timestamp();
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  MutexLocker ml(&_mutex, Mutex::_no_safepoint_check_flag);
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  int index = compute_log_index();
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  _records[index].thread = thread;
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  _records[index].timestamp = timestamp;
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  stringStream st(_records[index].data.buffer(),
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                  _records[index].data.size());
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  st.print("Exception <");
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  h_exception->print_value_on(&st);
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  st.print("%s%s> (" PTR_FORMAT ") \n"
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           "thrown [%s, line %d]",
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           message ? ": " : "", message ? message : "",
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           p2i(h_exception()), file, line);
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}
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