mozglue/linker/Logging.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef Logging_h
   6 #define Logging_h
   7
   8 #include "mozilla/Likely.h"
   9 #include "mozilla/MacroArgs.h"
  10
  11 #ifdef ANDROID
  12 #include <android/log.h>
  13 #define LOG(...) __android_log_print(ANDROID_LOG_INFO, "GeckoLinker", __VA_ARGS__)
  14 #define WARN(...) __android_log_print(ANDROID_LOG_WARN, "GeckoLinker", __VA_ARGS__)
  15 #define ERROR(...) __android_log_print(ANDROID_LOG_ERROR, "GeckoLinker", __VA_ARGS__)
  16 #else
  17 #include <cstdio>
  18
  19 /* Expand to 1 or m depending on whether there is one argument or more
  20  * given. */
  21 #define MOZ_ONE_OR_MORE_ARGS_IMPL2(_1, _2, _3, _4, _5, _6, _7, _8, _9, N, ...) \
  22   N
  23 #define MOZ_ONE_OR_MORE_ARGS_IMPL(args) MOZ_ONE_OR_MORE_ARGS_IMPL2 args
  24 #define MOZ_ONE_OR_MORE_ARGS(...) \
  25   MOZ_ONE_OR_MORE_ARGS_IMPL((__VA_ARGS__, m, m, m, m, m, m, m, m, 1, 0))
  26
  27 #define MOZ_MACRO_GLUE(a, b) a b
  28
  29 /* Some magic to choose between LOG1 and LOGm depending on the number of
  30  * arguments */
  31 #define MOZ_CHOOSE_LOG(...) \
  32   MOZ_MACRO_GLUE(MOZ_CONCAT(LOG, MOZ_ONE_OR_MORE_ARGS(__VA_ARGS__)), \
  33                  (__VA_ARGS__))
  34
  35 #define LOG1(format) fprintf(stderr, format "\n")
  36 #define LOGm(format, ...) fprintf(stderr, format "\n", __VA_ARGS__)
  37 #define LOG(...) MOZ_CHOOSE_LOG(__VA_ARGS__)
  38 #define WARN(...) MOZ_CHOOSE_LOG("Warning: " __VA_ARGS__)
  39 #define ERROR(...) MOZ_CHOOSE_LOG("Error: " __VA_ARGS__)
  40
  41 #endif
  42
  43 class Logging
  44 {
  45 public:
  46   static bool isVerbose()
  47   {
  48     return Singleton.verbose;
  49   }
  50
  51 private:
  52   bool verbose;
  53
  54 public:
  55   static void Init()
  56   {
  57     const char *env = getenv("MOZ_DEBUG_LINKER");
  58     if (env && *env == '1')
  59       Singleton.verbose = true;
  60   }
  61
  62 private:
  63   static Logging Singleton;
  64 };
  65
  66 #define DEBUG_LOG(...)   \
  67   do {                   \
  68     if (MOZ_UNLIKELY(Logging::isVerbose())) {  \
  69       LOG(__VA_ARGS__);  \
  70     }                    \
  71   } while(0)
  72
  73 #endif /* Logging_h */