lldb/tools/debugserver/source/MacOSX/OsLogger.cpp

//===-- OsLogger.cpp --------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "OsLogger.h"

#if LLDB_USE_OS_LOG

#include <os/log.h>

#include "DNBDefs.h"
#include "DNBLog.h"

#define LLDB_OS_LOG_MAX_BUFFER_LENGTH 256

namespace {
//----------------------------------------------------------------------
// Darwin os_log logging callback that can be registered with
// DNBLogSetLogCallback
//----------------------------------------------------------------------
void DarwinLogCallback(void *baton, uint32_t flags, const char *format,
                       va_list args) {
  if (format == nullptr)
    return;

  static os_log_t g_logger;
  if (!g_logger) {
    g_logger = os_log_create("com.apple.dt.lldb", "debugserver");
    if (!g_logger)
      return;
  }

  os_log_type_t log_type;
  if (flags & DNBLOG_FLAG_FATAL)
    log_type = OS_LOG_TYPE_FAULT;
  else if (flags & DNBLOG_FLAG_ERROR)
    log_type = OS_LOG_TYPE_ERROR;
  else if (flags & DNBLOG_FLAG_WARNING)
    log_type = OS_LOG_TYPE_DEFAULT;
  else if (flags & DNBLOG_FLAG_VERBOSE)
    log_type = OS_LOG_TYPE_DEBUG;
  else
    log_type = OS_LOG_TYPE_DEFAULT;

  // This code is unfortunate.  os_log* only takes static strings, but
  // our current log API isn't set up to make use of that style.
  char buffer[LLDB_OS_LOG_MAX_BUFFER_LENGTH];
  vsnprintf(buffer, sizeof(buffer), format, args);
  os_log_with_type(g_logger, log_type, "%{public}s", buffer);
}
}

DNBCallbackLog OsLogger::GetLogFunction() {
  return _os_log_impl ? DarwinLogCallback : nullptr;
}

#else

DNBCallbackLog OsLogger::GetLogFunction() { return nullptr; }

#endif