// Copyright (c) 2006, Google Inc.

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

//     * Neither the name of Google Inc. nor the names of its

// contributors may be used to endorse or promote products derived from

// this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Author: Maxim Lifantsev

//

// Thread-safe logging routines that do not allocate any memory or

// acquire any locks, and can therefore be used by low-level memory

// allocation and synchronization code.

#ifndef BASE_RAW_LOGGING_H_

#define BASE_RAW_LOGGING_H_

#include <time.h>

@ac_google_start_namespace@

#include "glog/log_severity.h"

#include "glog/vlog_is_on.h"

// Annoying stuff for windows -- makes sure clients can import these functions

#ifndef GOOGLE_GLOG_DLL_DECL

# if defined(_WIN32) && !defined(__CYGWIN__)

#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)

# else

#   define GOOGLE_GLOG_DLL_DECL

# endif

#endif

// This is similar to LOG(severity) << format... and VLOG(level) << format..,

// but

// * it is to be used ONLY by low-level modules that can't use normal LOG()

// * it is desiged to be a low-level logger that does not allocate any

//   memory and does not need any locks, hence:

// * it logs straight and ONLY to STDERR w/o buffering

// * it uses an explicit format and arguments list

// * it will silently chop off really long message strings

// Usage example:

//   RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);

//   RAW_VLOG(3, "status is %i", status);

// These will print an almost standard log lines like this to stderr only:

//   E0821 211317 file.cc:123] RAW: Failed foo with 22: bad_file

//   I0821 211317 file.cc:142] RAW: status is 20

#define RAW_LOG(severity, ...) \

  do { \

    switch (@ac_google_namespace@::GLOG_ ## severity) {  \

      case 0: \

        RAW_LOG_INFO(__VA_ARGS__); \

        break; \

      case 1: \

        RAW_LOG_WARNING(__VA_ARGS__); \

        break; \

      case 2: \

        RAW_LOG_ERROR(__VA_ARGS__); \

        break; \

      case 3: \

        RAW_LOG_FATAL(__VA_ARGS__); \

        break; \

      default: \

        break; \

    } \

  } while (0)

// The following STRIP_LOG testing is performed in the header file so that it's

// possible to completely compile out the logging code and the log messages.

#if STRIP_LOG == 0

#define RAW_VLOG(verboselevel, ...) \

  do { \

    if (VLOG_IS_ON(verboselevel)) { \

      RAW_LOG_INFO(__VA_ARGS__); \

    } \

  } while (0)

#else

#define RAW_VLOG(verboselevel, ...) RawLogStub__(0, __VA_ARGS__)

#endif // STRIP_LOG == 0

#if STRIP_LOG == 0

#define RAW_LOG_INFO(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_INFO, \

                                   __FILE__, __LINE__, __VA_ARGS__)

#else

#define RAW_LOG_INFO(...) @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__)

#endif // STRIP_LOG == 0

#if STRIP_LOG <= 1

#define RAW_LOG_WARNING(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_WARNING,   \

                                      __FILE__, __LINE__, __VA_ARGS__)

#else

#define RAW_LOG_WARNING(...) @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__)

#endif // STRIP_LOG <= 1

#if STRIP_LOG <= 2

#define RAW_LOG_ERROR(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_ERROR,       \

                                    __FILE__, __LINE__, __VA_ARGS__)

#else

#define RAW_LOG_ERROR(...) @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__)

#endif // STRIP_LOG <= 2

#if STRIP_LOG <= 3

#define RAW_LOG_FATAL(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_FATAL,       \

                                    __FILE__, __LINE__, __VA_ARGS__)

#else

#define RAW_LOG_FATAL(...) \

  do { \

    @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__);        \

    exit(1); \

  } while (0)

#endif // STRIP_LOG <= 3

// Similar to CHECK(condition) << message,

// but for low-level modules: we use only RAW_LOG that does not allocate memory.

// We do not want to provide args list here to encourage this usage:

//   if (!cond)  RAW_LOG(FATAL, "foo ...", hard_to_compute_args);

// so that the args are not computed when not needed.

#define RAW_CHECK(condition, message)                                   \

  do {                                                                  \

    if (!(condition)) {                                                 \

      RAW_LOG(FATAL, "Check %s failed: %s", #condition, message);       \

    }                                                                   \

  } while (0)

// Debug versions of RAW_LOG and RAW_CHECK

#ifndef NDEBUG

#define RAW_DLOG(severity, ...) RAW_LOG(severity, __VA_ARGS__)

#define RAW_DCHECK(condition, message) RAW_CHECK(condition, message)

#else  // NDEBUG

#define RAW_DLOG(severity, ...)                                 \

  while (false)                                                 \

    RAW_LOG(severity, __VA_ARGS__)

#define RAW_DCHECK(condition, message) \

  while (false) \

    RAW_CHECK(condition, message)

#endif  // NDEBUG

// Stub log function used to work around for unused variable warnings when

// building with STRIP_LOG > 0.

static inline void RawLogStub__(int /* ignored */, ...) {

}

// Helper function to implement RAW_LOG and RAW_VLOG

// Logs format... at "severity" level, reporting it

// as called from file:line.

// This does not allocate memory or acquire locks.

GOOGLE_GLOG_DLL_DECL void RawLog__(LogSeverity severity,

                                   const char* file,

                                   int line,

                                   const char* format, ...)

   @ac_cv___attribute___printf_4_5@;

// Hack to propagate time information into this module so that

// this module does not have to directly call localtime_r(),

// which could allocate memory.

GOOGLE_GLOG_DLL_DECL void RawLog__SetLastTime(const struct tm& t, int usecs);

@ac_google_end_namespace@

#endif  // BASE_RAW_LOGGING_H_