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 <cstdlib>
   9 #include "mozilla/Likely.h"
  10 #include "mozilla/MacroArgs.h"
  11
  12 #ifdef ANDROID
  13 #  include <android/log.h>
  14 #  define LOG(...) \
  15     __android_log_print(ANDROID_LOG_INFO, "GeckoLinker", __VA_ARGS__)
  16 #  define WARN(...) \
  17     __android_log_print(ANDROID_LOG_WARN, "GeckoLinker", __VA_ARGS__)
  18 #  define ERROR(...) \
  19     __android_log_print(ANDROID_LOG_ERROR, "GeckoLinker", __VA_ARGS__)
  20 #else
  21 #  include <cstdio>
  22
  23 /* Expand to 1 or m depending on whether there is one argument or more
  24  * given. */
  25 #  define MOZ_ONE_OR_MORE_ARGS_IMPL2(_1, _2, _3, _4, _5, _6, _7, _8, _9, N, \
  26                                      ...)                                   \
  27     N
  28 #  define MOZ_ONE_OR_MORE_ARGS_IMPL(args) MOZ_ONE_OR_MORE_ARGS_IMPL2 args
  29 #  define MOZ_ONE_OR_MORE_ARGS(...) \
  30     MOZ_ONE_OR_MORE_ARGS_IMPL((__VA_ARGS__, m, m, m, m, m, m, m, m, 1, 0))
  31
  32 #  define MOZ_MACRO_GLUE(a, b) a b
  33
  34 /* Some magic to choose between LOG1 and LOGm depending on the number of
  35  * arguments */
  36 #  define MOZ_CHOOSE_LOG(...)                                          \
  37     MOZ_MACRO_GLUE(MOZ_CONCAT(LOG, MOZ_ONE_OR_MORE_ARGS(__VA_ARGS__)), \
  38                    (__VA_ARGS__))
  39
  40 #  define LOG1(format) fprintf(stderr, format "\n")
  41 #  define LOGm(format, ...) fprintf(stderr, format "\n", __VA_ARGS__)
  42 #  define LOG(...) MOZ_CHOOSE_LOG(__VA_ARGS__)
  43 #  define WARN(...) MOZ_CHOOSE_LOG("Warning: " __VA_ARGS__)
  44 #  define ERROR(...) MOZ_CHOOSE_LOG("Error: " __VA_ARGS__)
  45
  46 #endif
  47
  48 class Logging {
  49  public:
  50   static bool isVerbose() { return Singleton.verbose; }
  51
  52  private:
  53   bool verbose;
  54
  55  public:
  56   static void Init() {
  57     const char* env = getenv("MOZ_DEBUG_LINKER");
  58     if (env && *env == '1') Singleton.verbose = true;
  59   }
  60
  61  private:
  62   static Logging Singleton;
  63 };
  64
  65 #define DEBUG_LOG(...)                        \
  66   do {                                        \
  67     if (MOZ_UNLIKELY(Logging::isVerbose())) { \
  68       LOG(__VA_ARGS__);                       \
  69     }                                         \
  70   } while (0)
  71
  72 #endif /* Logging_h */