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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Logging macros, similar to Chromium's base/logging.h, except with |MOJO_| | |
| 6 // prefixes and missing some features (notably |CHECK_EQ()|, etc.). | |
| 7 | |
| 8 // TODO(vtl): It's weird that this is in the environment directory, since its | |
| 9 // implementation (in environment/lib) is meant to be used by any implementation | |
| 10 // of the environment. | |
| 11 | |
| 12 #ifndef MOJO_PUBLIC_CPP_ENVIRONMENT_LOGGING_H_ | |
| 13 #define MOJO_PUBLIC_CPP_ENVIRONMENT_LOGGING_H_ | |
| 14 | |
| 15 #include <sstream> | |
| 16 | |
| 17 #include "mojo/public/c/environment/logger.h" | |
| 18 #include "mojo/public/cpp/environment/environment.h" | |
| 19 #include "mojo/public/cpp/system/macros.h" | |
| 20 | |
| 21 #define MOJO_LOG_STREAM(level) \ | |
| 22 ::mojo::internal::LogMessage(__FILE__, __LINE__, MOJO_LOG_LEVEL_##level) \ | |
| 23 .stream() | |
| 24 | |
| 25 #define MOJO_LAZY_LOG_STREAM(level, condition) \ | |
| 26 !(condition) ? (void)0 \ | |
| 27 : ::mojo::internal::VoidifyOstream() & MOJO_LOG_STREAM(level) | |
| 28 | |
| 29 #define MOJO_SHOULD_LOG(level) \ | |
| 30 (MOJO_LOG_LEVEL_##level >= \ | |
| 31 ::mojo::Environment::GetDefaultLogger()->GetMinimumLogLevel()) | |
| 32 | |
| 33 #define MOJO_LOG(level) MOJO_LAZY_LOG_STREAM(level, MOJO_SHOULD_LOG(level)) | |
| 34 | |
| 35 #define MOJO_LOG_IF(level, condition) \ | |
| 36 MOJO_LAZY_LOG_STREAM(level, MOJO_SHOULD_LOG(level) && (condition)) | |
| 37 | |
| 38 #define MOJO_CHECK(condition) \ | |
| 39 MOJO_LAZY_LOG_STREAM(FATAL, !(condition)) << "Check failed: " #condition "." \ | |
| 40 " " | |
| 41 | |
| 42 // Note: For non-debug builds, |MOJO_DLOG_IF()| *eliminates* (i.e., doesn't | |
| 43 // compile) the condition, whereas |MOJO_DCHECK()| "neuters" the condition | |
| 44 // (i.e., compiles, but doesn't evaluate). | |
| 45 #ifdef NDEBUG | |
| 46 | |
| 47 #define MOJO_DLOG(level) MOJO_LAZY_LOG_STREAM(level, false) | |
| 48 #define MOJO_DLOG_IF(level, condition) MOJO_LAZY_LOG_STREAM(level, false) | |
| 49 #define MOJO_DCHECK(condition) \ | |
| 50 MOJO_LAZY_LOG_STREAM(FATAL, false ? !(condition) : false) | |
| 51 | |
| 52 #else | |
| 53 | |
| 54 #define MOJO_DLOG(level) MOJO_LOG(level) | |
| 55 #define MOJO_DLOG_IF(level, condition) MOJO_LOG_IF(level, condition) | |
| 56 #define MOJO_DCHECK(condition) MOJO_CHECK(condition) | |
| 57 | |
| 58 #endif // NDEBUG | |
| 59 | |
| 60 namespace mojo { | |
| 61 namespace internal { | |
| 62 | |
| 63 class LogMessage { | |
| 64 public: | |
| 65 LogMessage(const char* file, int line, MojoLogLevel log_level); | |
| 66 ~LogMessage(); | |
| 67 | |
| 68 std::ostream& stream() { return stream_; } | |
| 69 | |
| 70 private: | |
| 71 const MojoLogLevel log_level_; | |
| 72 std::ostringstream stream_; | |
| 73 | |
| 74 MOJO_DISALLOW_COPY_AND_ASSIGN(LogMessage); | |
| 75 }; | |
| 76 | |
| 77 // Used to ignore a stream. | |
| 78 struct VoidifyOstream { | |
| 79 // Use & since it has precedence lower than << but higher than ?:. | |
| 80 void operator&(std::ostream&) {} | |
| 81 }; | |
| 82 | |
| 83 } // namespace internal | |
| 84 } // namespace mojo | |
| 85 | |
| 86 #endif // MOJO_PUBLIC_CPP_ENVIRONMENT_LOGGING_H_ | |
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