The Tor Browser: mozglue/linker/Logging.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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/. */

     5 #ifndef Logging_h

     6 #define Logging_h

     8 #include "mozilla/Likely.h"

    10 #ifdef ANDROID

    11 #include <android/log.h>

    12 #define LOG(...) __android_log_print(ANDROID_LOG_ERROR, "GeckoLinker", __VA_ARGS__)

    13 #else

    14 #include <cstdio>

    16 /* Expand to 1 or m depending on whether there is one argument or more

    17  * given. */

    18 #define MOZ_ONE_OR_MORE_ARGS_IMPL2(_1, _2, _3, _4, _5, _6, _7, _8, _9, N, ...) \

    19   N

    20 #define MOZ_ONE_OR_MORE_ARGS_IMPL(args) MOZ_ONE_OR_MORE_ARGS_IMPL2 args

    21 #define MOZ_ONE_OR_MORE_ARGS(...) \

    22   MOZ_ONE_OR_MORE_ARGS_IMPL((__VA_ARGS__, m, m, m, m, m, m, m, m, 1, 0))

    24 #define MOZ_MACRO_GLUE(a, b) a b

    25 #define MOZ_CONCAT2(a, b) a ## b

    26 #define MOZ_CONCAT1(a, b) MOZ_CONCAT2(a, b)

    27 #define MOZ_CONCAT(a, b) MOZ_CONCAT1(a, b)

    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__))

    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__)

    39 #endif

    41 class Logging

    42 {

    43 public:

    44   static bool isVerbose()

    45   {

    46     return Singleton.verbose;

    47   }

    49 private:

    50   bool verbose;

    52 public:

    53   static void Init()

    54   {

    55     const char *env = getenv("MOZ_DEBUG_LINKER");

    56     if (env && *env == '1')

    57       Singleton.verbose = true;

    58   }

    60 private:

    61   static Logging Singleton;

    62 };

    64 #define DEBUG_LOG(...)   \

    65   do {                   \

    66     if (MOZ_UNLIKELY(Logging::isVerbose())) {  \

    67       LOG(__VA_ARGS__);  \

    68     }                    \

    69   } while(0)

    71 #if defined(__LP64__)

    72 #  define PRIxAddr "lx"

    73 #  define PRIxSize "lx"

    74 #  define PRIdSize "ld"

    75 #  define PRIuSize "lu"

    76 #else

    77 #  define PRIxAddr "x"

    78 #  define PRIxSize "x"

    79 #  define PRIdSize "d"

    80 #  define PRIuSize "u"

    81 #endif

    83 #endif /* Logging_h */

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