diff options
| author | wangxianzhu@chromium.org <wangxianzhu@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2014-03-05 01:43:27 +0000 |
|---|---|---|
| committer | wangxianzhu@chromium.org <wangxianzhu@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2014-03-05 01:43:27 +0000 |
| commit | 3ee50d193a9d6e80e7d39f260f9e3c12641c95a9 (patch) | |
| tree | 7b47c4a921890f5a634974c572b06bb84785b935 /base/logging.h | |
| parent | 880331f97dcc3f3ade1f0d05c2c95519e0566c05 (diff) | |
| download | chromium_src-3ee50d193a9d6e80e7d39f260f9e3c12641c95a9.zip chromium_src-3ee50d193a9d6e80e7d39f260f9e3c12641c95a9.tar.gz chromium_src-3ee50d193a9d6e80e7d39f260f9e3c12641c95a9.tar.bz2 | |
Avoid function call for disabled DCHECK in non-official release build
Previously each disabled DCHECK in non-official release build needs
to call a function. This change avoids the cost of the function call.
Now on x86, assembly code of a DCHECK is like the following:
mov g_dcheck_state,%rax
cmpl $0x1,(%rax)
je dcheck_enabled
# normal code
...
dcheck_enabled:
...
BUG=none
Review URL: https://codereview.chromium.org/186963004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254909 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'base/logging.h')
| -rw-r--r-- | base/logging.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/base/logging.h b/base/logging.h index 0140780..2c538d2 100644 --- a/base/logging.h +++ b/base/logging.h @@ -171,7 +171,7 @@ enum LoggingDestination { // Indicates that the log file should be locked when being written to. // Unless there is only one single-threaded process that is logging to // the log file, the file should be locked during writes to make each -// log outut atomic. Other writers will block. +// log output atomic. Other writers will block. // // All processes writing to the log file must have their locking set for it to // work properly. Defaults to LOCK_LOG_FILE. @@ -674,7 +674,7 @@ enum { DEBUG_MODE = ENABLE_DLOG }; #if defined(NDEBUG) -BASE_EXPORT DcheckState get_dcheck_state(); +BASE_EXPORT extern DcheckState g_dcheck_state; BASE_EXPORT void set_dcheck_state(DcheckState state); #if defined(DCHECK_ALWAYS_ON) @@ -691,10 +691,11 @@ const LogSeverity LOG_DCHECK = LOG_FATAL; COMPACT_GOOGLE_LOG_EX_ERROR_REPORT(ClassName , ##__VA_ARGS__) #define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_ERROR_REPORT const LogSeverity LOG_DCHECK = LOG_ERROR_REPORT; -#define DCHECK_IS_ON() \ - ((::logging::get_dcheck_state() == \ - ::logging::ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS) && \ - LOG_IS_ON(DCHECK)) + +#define DCHECK_IS_ON() \ + UNLIKELY(::logging::g_dcheck_state == \ + ::logging::ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS) && \ + LOG_IS_ON(DCHECK) #endif // defined(DCHECK_ALWAYS_ON) |