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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 // The actual stream used isn't important. | 429 BASE_EXPORT extern std::ostream* g_swallow_stream; |
430 #define EAT_STREAM_PARAMETERS \ | 430 |
431 true ? (void) 0 : ::logging::LogMessageVoidify() & LOG_STREAM(FATAL) | 431 // Note that g_swallow_stream is used instead of an arbitrary LOG() stream to |
| 432 // avoid the creation of an object with a non-trivial destructor (LogMessage). |
| 433 // On MSVC x86 (checked on 2015 Update 3), this causes a few additional |
| 434 // pointless instructions to be emitted even at full optimization level, even |
| 435 // though the : arm of the ternary operator is clearly never executed. Using a |
| 436 // simpler object to be &'d with Voidify() avoids these extra instructions. |
| 437 // Using a simpler POD object with a templated operator<< also works to avoid |
| 438 // these instructions. However, this causes warnings on statically defined |
| 439 // implementations of operator<<(std::ostream, ...) in some .cc files, because |
| 440 // they become defined-but-unreferenced functions. A reinterpret_cast of 0 to an |
| 441 // ostream* also is not suitable, because some compilers warn of undefined |
| 442 // behavior. |
| 443 #define EAT_STREAM_PARAMETERS \ |
| 444 true ? (void)0 \ |
| 445 : ::logging::LogMessageVoidify() & (*::logging::g_swallow_stream) |
432 | 446 |
433 // Captures the result of a CHECK_EQ (for example) and facilitates testing as a | 447 // Captures the result of a CHECK_EQ (for example) and facilitates testing as a |
434 // boolean. | 448 // boolean. |
435 class CheckOpResult { | 449 class CheckOpResult { |
436 public: | 450 public: |
437 // |message| must be non-null if and only if the check failed. | 451 // |message| must be non-null if and only if the check failed. |
438 CheckOpResult(std::string* message) : message_(message) {} | 452 CheckOpResult(std::string* message) : message_(message) {} |
439 // Returns true if the check succeeded. | 453 // Returns true if the check succeeded. |
440 operator bool() const { return !message_; } | 454 operator bool() const { return !message_; } |
441 // Returns the message. | 455 // Returns the message. |
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1015 #elif NOTIMPLEMENTED_POLICY == 5 | 1029 #elif NOTIMPLEMENTED_POLICY == 5 |
1016 #define NOTIMPLEMENTED() do {\ | 1030 #define NOTIMPLEMENTED() do {\ |
1017 static bool logged_once = false;\ | 1031 static bool logged_once = false;\ |
1018 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ | 1032 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ |
1019 logged_once = true;\ | 1033 logged_once = true;\ |
1020 } while(0);\ | 1034 } while(0);\ |
1021 EAT_STREAM_PARAMETERS | 1035 EAT_STREAM_PARAMETERS |
1022 #endif | 1036 #endif |
1023 | 1037 |
1024 #endif // BASE_LOGGING_H_ | 1038 #endif // BASE_LOGGING_H_ |
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