log.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2006,2007 INRIA
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */

#ifndef LOG_H
#define LOG_H

#include <string>
#include <iostream>
#include <stdint.h>

namespace ns3 {

enum LogLevel {
  LOG_NONE           = 0x00000000, // no logging

  LOG_ERROR          = 0x00000001, // serious error messages only
  LOG_LEVEL_ERROR    = 0x00000001,

  LOG_WARN           = 0x00000002, // warning messages
  LOG_LEVEL_WARN     = 0x00000003,

  LOG_DEBUG          = 0x00000004, // rare ad-hoc debug messages
  LOG_LEVEL_DEBUG    = 0x00000007,

  LOG_INFO           = 0x00000008, // informational messages (e.g., banners)
  LOG_LEVEL_INFO     = 0x0000000f,

  LOG_FUNCTION       = 0x00000010, // function tracing
  LOG_LEVEL_FUNCTION = 0x0000001f, 

  LOG_LOGIC          = 0x00000020, // control flow tracing within functions
  LOG_LEVEL_LOGIC    = 0x0000003f,

  LOG_ALL            = 0x1fffffff, // print everything
  LOG_LEVEL_ALL      = LOG_ALL,

  LOG_PREFIX_FUNC    = 0x80000000, // prefix all trace prints with function
  LOG_PREFIX_TIME    = 0x40000000, // prefix all trace prints with simulation time
  LOG_PREFIX_NODE    = 0x20000000  // prefix all trace prints with simulation node
};

void LogComponentEnable (char const *name, enum LogLevel level);

void LogComponentEnableAll (enum LogLevel level);


void LogComponentDisable (char const *name, enum LogLevel level);

void LogComponentDisableAll (enum LogLevel level);


} // namespace ns3

#define NS_LOG_COMPONENT_DEFINE(name)                           \
  static ns3::LogComponent g_log = ns3::LogComponent (name)

#define NS_LOG_APPEND_TIME_PREFIX                               \
  if (g_log.IsEnabled (ns3::LOG_PREFIX_TIME))                   \
    {                                                           \
      ns3::LogTimePrinter printer = ns3::LogGetTimePrinter ();  \
      if (printer != 0)                                         \
        {                                                       \
          (*printer)(std::clog);                               \
          std::clog << " ";                                     \
        }                                                       \
    }

#define NS_LOG_APPEND_NODE_PREFIX                               \
  if (g_log.IsEnabled (ns3::LOG_PREFIX_NODE))                   \
    {                                                           \
      ns3::LogNodePrinter printer = ns3::LogGetNodePrinter ();  \
      if (printer != 0)                                         \
        {                                                       \
          (*printer)(std::clog);                               \
          std::clog << " ";                                     \
        }                                                       \
    }

#define NS_LOG_APPEND_FUNC_PREFIX                               \
  if (g_log.IsEnabled (ns3::LOG_PREFIX_FUNC))                   \
    {                                                           \
      std::clog << g_log.Name () << ":" <<                      \
      __FUNCTION__ << "(): ";                                 \
    }                                                           \

#ifndef NS_LOG_APPEND_CONTEXT
#define NS_LOG_APPEND_CONTEXT
#endif /* NS_LOG_APPEND_CONTEXT */



#ifdef NS3_LOG_ENABLE


#define NS_LOG(level, msg)                                      \
  do                                                            \
    {                                                           \
      if (g_log.IsEnabled (level))                              \
        {                                                       \
          NS_LOG_APPEND_TIME_PREFIX;                            \
          NS_LOG_APPEND_NODE_PREFIX;                            \
          NS_LOG_APPEND_CONTEXT;                                \
          NS_LOG_APPEND_FUNC_PREFIX;                            \
          std::clog << msg << std::endl;                        \
        }                                                       \
    }                                                           \
  while (false)

#define NS_LOG_ERROR(msg) \
  NS_LOG (ns3::LOG_ERROR, msg)

#define NS_LOG_WARN(msg) \
  NS_LOG (ns3::LOG_WARN, msg)

#define NS_LOG_DEBUG(msg) \
  NS_LOG (ns3::LOG_DEBUG, msg)

#define NS_LOG_INFO(msg) \
  NS_LOG (ns3::LOG_INFO, msg)

#define NS_LOG_FUNCTION_NOARGS()                                \
  do                                                            \
    {                                                           \
      if (g_log.IsEnabled (ns3::LOG_FUNCTION))                  \
        {                                                       \
          NS_LOG_APPEND_TIME_PREFIX;                            \
          NS_LOG_APPEND_NODE_PREFIX;                            \
          NS_LOG_APPEND_CONTEXT;                                \
          std::clog << g_log.Name () << ":"                     \
                    << __FUNCTION__ << "()" << std::endl;       \
        }                                                       \
    }                                                           \
  while (false)


#define NS_LOG_FUNCTION(parameters)                             \
  do                                                            \
    {                                                           \
      if (g_log.IsEnabled (ns3::LOG_FUNCTION))                  \
        {                                                       \
          NS_LOG_APPEND_TIME_PREFIX;                            \
          NS_LOG_APPEND_NODE_PREFIX;                            \
          NS_LOG_APPEND_CONTEXT;                                \
          std::clog << g_log.Name () << ":"                     \
                    << __FUNCTION__ << "(";                     \
          ns3::ParameterLogger (std::clog) << parameters;      \
          std::clog << ")" << std::endl;                        \
        }                                                       \
    }                                                           \
  while (false)


#define NS_LOG_LOGIC(msg) \
  NS_LOG (ns3::LOG_LOGIC, msg)

#define NS_LOG_UNCOND(msg)              \
  do                                    \
    {                                   \
      std::clog << msg << std::endl;    \
    }                                   \
  while (false)

#else /* LOG_ENABLE */

#define NS_LOG(level, msg)
#define NS_LOG_ERROR(msg)
#define NS_LOG_WARN(msg)
#define NS_LOG_DEBUG(msg)
#define NS_LOG_INFO(msg)
#define NS_LOG_FUNCTION_NOARGS()
#define NS_LOG_FUNCTION(msg)
#define NS_LOG_LOGIC(msg)
#define NS_LOG_UNCOND(msg)

#endif /* LOG_ENABLE */

namespace ns3 {

void LogComponentPrintList (void);

typedef void (*LogTimePrinter)(std::ostream &os);
typedef void (*LogNodePrinter)(std::ostream &os);

void LogSetTimePrinter (LogTimePrinter);
LogTimePrinter LogGetTimePrinter (void);

void LogSetNodePrinter (LogNodePrinter);
LogNodePrinter LogGetNodePrinter (void);


class LogComponent {
public:
  LogComponent (char const *name);
  void EnvVarCheck (char const *name);
  bool IsEnabled (enum LogLevel level) const;
  bool IsNoneEnabled (void) const;
  void Enable (enum LogLevel level);
  void Disable (enum LogLevel level);
  char const *Name (void) const;
private:
  int32_t     m_levels;
  char const *m_name;
};

class ParameterLogger : public std::ostream
{
  int m_itemNumber;
  std::ostream &m_os;
public:
  ParameterLogger (std::ostream &os);

  template<typename T>
  ParameterLogger& operator<< (T param)
  {
    switch (m_itemNumber)
      {
      case 0: // first parameter
        m_os << param;
        break;
      default: // parameter following a previous parameter
        m_os << ", " << param;
        break;
      }
    m_itemNumber++;
    return *this;
  }
};

} // namespace ns3


#endif /* LOG_H */