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
  10 #ifdef ANDROID
  11 #include <android/log.h>
  12 #define LOG(...) __android_log_print(ANDROID_LOG_INFO, "GeckoLinker", __VA_ARGS__)
  13 #define WARN(...) __android_log_print(ANDROID_LOG_WARN, "GeckoLinker", __VA_ARGS__)
  14 #define ERROR(...) __android_log_print(ANDROID_LOG_ERROR, "GeckoLinker", __VA_ARGS__)
  15 #else
  16 #include <cstdio>
  17
  18 /* Expand to 1 or m depending on whether there is one argument or more
  19  * given. */
  20 #define MOZ_ONE_OR_MORE_ARGS_IMPL2(_1, _2, _3, _4, _5, _6, _7, _8, _9, N, ...) \
  21   N
  22 #define MOZ_ONE_OR_MORE_ARGS_IMPL(args) MOZ_ONE_OR_MORE_ARGS_IMPL2 args
  23 #define MOZ_ONE_OR_MORE_ARGS(...) \
  24   MOZ_ONE_OR_MORE_ARGS_IMPL((__VA_ARGS__, m, m, m, m, m, m, m, m, 1, 0))
  25
  26 #define MOZ_MACRO_GLUE(a, b) a b
  27 #define MOZ_CONCAT2(a, b) a ## b
  28 #define MOZ_CONCAT1(a, b) MOZ_CONCAT2(a, b)
  29 #define MOZ_CONCAT(a, b) MOZ_CONCAT1(a, b)
  30
  31 /* Some magic to choose between LOG1 and LOGm depending on the number of
  32  * arguments */
  33 #define MOZ_CHOOSE_LOG(...) \
  34   MOZ_MACRO_GLUE(MOZ_CONCAT(LOG, MOZ_ONE_OR_MORE_ARGS(__VA_ARGS__)), \
  35                  (__VA_ARGS__))
  36
  37 #define LOG1(format) fprintf(stderr, format "\n")
  38 #define LOGm(format, ...) fprintf(stderr, format "\n", __VA_ARGS__)
  39 #define LOG(...) MOZ_CHOOSE_LOG(__VA_ARGS__)
  40 #define WARN(...) MOZ_CHOOSE_LOG("Warning: " __VA_ARGS__)
  41 #define ERROR(...) MOZ_CHOOSE_LOG("Error: " __VA_ARGS__)
  42
  43 #endif
  44
  45 class Logging
  46 {
  47 public:
  48   static bool isVerbose()
  49   {
  50     return Singleton.verbose;
  51   }
  52
  53 private:
  54   bool verbose;
  55
  56 public:
  57   static void Init()
  58   {
  59     const char *env = getenv("MOZ_DEBUG_LINKER");
  60     if (env && *env == '1')
  61       Singleton.verbose = true;
  62   }
  63
  64 private:
  65   static Logging Singleton;
  66 };
  67
  68 #define DEBUG_LOG(...)   \
  69   do {                   \
  70     if (MOZ_UNLIKELY(Logging::isVerbose())) {  \
  71       LOG(__VA_ARGS__);  \
  72     }                    \
  73   } while(0)
  74
  75 #if defined(__LP64__)
  76 #  define PRIxAddr "lx"
  77 #  define PRIxSize "lx"
  78 #  define PRIdSize "ld"
  79 #  define PRIuSize "lu"
  80 #else
  81 #  define PRIxAddr "x"
  82 #  define PRIxSize "x"
  83 #  define PRIdSize "d"
  84 #  define PRIuSize "u"
  85 #endif
  86
  87 #endif /* Logging_h */