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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_LOGGING_H_ | 5 #ifndef BASE_LOGGING_H_ |
6 #define BASE_LOGGING_H_ | 6 #define BASE_LOGGING_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <cassert> | 10 #include <cassert> |
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419 COMPACT_GOOGLE_LOG_EX_ ## severity(ErrnoLogMessage, \ | 419 COMPACT_GOOGLE_LOG_EX_ ## severity(ErrnoLogMessage, \ |
420 ::logging::GetLastSystemErrorCode()).stream() | 420 ::logging::GetLastSystemErrorCode()).stream() |
421 #endif | 421 #endif |
422 | 422 |
423 #define PLOG(severity) \ | 423 #define PLOG(severity) \ |
424 LAZY_STREAM(PLOG_STREAM(severity), LOG_IS_ON(severity)) | 424 LAZY_STREAM(PLOG_STREAM(severity), LOG_IS_ON(severity)) |
425 | 425 |
426 #define PLOG_IF(severity, condition) \ | 426 #define PLOG_IF(severity, condition) \ |
427 LAZY_STREAM(PLOG_STREAM(severity), LOG_IS_ON(severity) && (condition)) | 427 LAZY_STREAM(PLOG_STREAM(severity), LOG_IS_ON(severity) && (condition)) |
428 | 428 |
429 // Note that the null ostream is used instead of an arbitrary LOG() stream to | 429 // The actual stream used isn't important. |
430 // avoid the creation of an object with a non-trivial destructor (LogMessage). | 430 #define EAT_STREAM_PARAMETERS \ |
431 // On MSVC x86 (checked on 2015 Update 3), doing so causes a few additional | 431 true ? (void) 0 : ::logging::LogMessageVoidify() & LOG_STREAM(FATAL) |
432 // pointless instructions to be emitted even at full optimization level, even | |
433 // though the : arm of the ternary operator is clearly never executed. Using a | |
434 // simpler POD object with a templated operator<< also works to avoid these | |
435 // instructions. However, this causes warnings on statically defined | |
436 // implementations of operator<<(std::ostream, ...) in some .cc files, because | |
437 // they become defined-but-unreferenced functions. | |
438 #define EAT_STREAM_PARAMETERS \ | |
439 true \ | |
440 ? (void)0 \ | |
441 : ::logging::LogMessageVoidify() & (*reinterpret_cast<std::ostream*>(0)) | |
442 | 432 |
443 // Captures the result of a CHECK_EQ (for example) and facilitates testing as a | 433 // Captures the result of a CHECK_EQ (for example) and facilitates testing as a |
444 // boolean. | 434 // boolean. |
445 class CheckOpResult { | 435 class CheckOpResult { |
446 public: | 436 public: |
447 // |message| must be non-null if and only if the check failed. | 437 // |message| must be non-null if and only if the check failed. |
448 CheckOpResult(std::string* message) : message_(message) {} | 438 CheckOpResult(std::string* message) : message_(message) {} |
449 // Returns true if the check succeeded. | 439 // Returns true if the check succeeded. |
450 operator bool() const { return !message_; } | 440 operator bool() const { return !message_; } |
451 // Returns the message. | 441 // Returns the message. |
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1025 #elif NOTIMPLEMENTED_POLICY == 5 | 1015 #elif NOTIMPLEMENTED_POLICY == 5 |
1026 #define NOTIMPLEMENTED() do {\ | 1016 #define NOTIMPLEMENTED() do {\ |
1027 static bool logged_once = false;\ | 1017 static bool logged_once = false;\ |
1028 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ | 1018 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ |
1029 logged_once = true;\ | 1019 logged_once = true;\ |
1030 } while(0);\ | 1020 } while(0);\ |
1031 EAT_STREAM_PARAMETERS | 1021 EAT_STREAM_PARAMETERS |
1032 #endif | 1022 #endif |
1033 | 1023 |
1034 #endif // BASE_LOGGING_H_ | 1024 #endif // BASE_LOGGING_H_ |
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