mozglue/linker/Logging.h
author Andreas Pehrson <apehrson@mozilla.com>
Fri, 23 Nov 2018 15:01:01 +0000
changeset 504264 7964b0b2f8363fbf1e5d3cdcc50b1d279987f1e9
parent 453345 534f60b7cb2b41b9bc7024b34332521160054c9f
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1423241 - Ensure audio loads after video to make drawImage happy. r=jib https://github.com/whatwg/html/issues/4128 filed to cover this case in the spec. Differential Revision: https://phabricator.services.mozilla.com/D12270

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef Logging_h
#define Logging_h

#include "mozilla/Likely.h"
#include "mozilla/MacroArgs.h"

#ifdef ANDROID
#include <android/log.h>
#define LOG(...) __android_log_print(ANDROID_LOG_INFO, "GeckoLinker", __VA_ARGS__)
#define WARN(...) __android_log_print(ANDROID_LOG_WARN, "GeckoLinker", __VA_ARGS__)
#define ERROR(...) __android_log_print(ANDROID_LOG_ERROR, "GeckoLinker", __VA_ARGS__)
#else
#include <cstdio>

/* Expand to 1 or m depending on whether there is one argument or more
 * given. */
#define MOZ_ONE_OR_MORE_ARGS_IMPL2(_1, _2, _3, _4, _5, _6, _7, _8, _9, N, ...) \
  N
#define MOZ_ONE_OR_MORE_ARGS_IMPL(args) MOZ_ONE_OR_MORE_ARGS_IMPL2 args
#define MOZ_ONE_OR_MORE_ARGS(...) \
  MOZ_ONE_OR_MORE_ARGS_IMPL((__VA_ARGS__, m, m, m, m, m, m, m, m, 1, 0))

#define MOZ_MACRO_GLUE(a, b) a b

/* Some magic to choose between LOG1 and LOGm depending on the number of
 * arguments */
#define MOZ_CHOOSE_LOG(...) \
  MOZ_MACRO_GLUE(MOZ_CONCAT(LOG, MOZ_ONE_OR_MORE_ARGS(__VA_ARGS__)), \
                 (__VA_ARGS__))

#define LOG1(format) fprintf(stderr, format "\n")
#define LOGm(format, ...) fprintf(stderr, format "\n", __VA_ARGS__)
#define LOG(...) MOZ_CHOOSE_LOG(__VA_ARGS__)
#define WARN(...) MOZ_CHOOSE_LOG("Warning: " __VA_ARGS__)
#define ERROR(...) MOZ_CHOOSE_LOG("Error: " __VA_ARGS__)

#endif

class Logging
{
public:
  static bool isVerbose()
  {
    return Singleton.verbose;
  }

private:
  bool verbose;

public:
  static void Init()
  {
    const char *env = getenv("MOZ_DEBUG_LINKER");
    if (env && *env == '1')
      Singleton.verbose = true;
  }

private:
  static Logging Singleton;
};

#define DEBUG_LOG(...)   \
  do {                   \
    if (MOZ_UNLIKELY(Logging::isVerbose())) {  \
      LOG(__VA_ARGS__);  \
    }                    \
  } while(0)

#endif /* Logging_h */