Bug 140383 – Fix Debug Build Error in Webcore module

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Shivakumar J M]

Got below debug build error for 32-bit efl port:

CMakeFiles/WebCore.dir/platform/linux/MemoryPressureHandlerLinux.cpp.o -c ../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp
In file included from ../../Source/WTF/wtf/PossiblyNull.h:29:0,
                 from ../../Source/WTF/wtf/FastMalloc.h:26,
                 from ../../Source/WebCore/config.h:75,
                 from ../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:27:
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp: In member function ‘void WebCore::MemoryPressureHandler::ReliefLogger::platformLog()’:
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 4 has type ‘ssize_t {aka int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:212:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: -dirty %ld bytes (from %ld to %ld)", m_logString, (memoryDiff * -1), m_initialMemory, currentMemory);
         ^
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 5 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:212:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: -dirty %ld bytes (from %ld to %ld)", m_logString, (memoryDiff * -1), m_initialMemory, currentMemory);
         ^
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:212:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: -dirty %ld bytes (from %ld to %ld)", m_logString, (memoryDiff * -1), m_initialMemory, currentMemory);
         ^
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 4 has type ‘ssize_t {aka int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:214:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: +dirty %ld bytes (from %ld to %ld)", m_logString, memoryDiff, m_initialMemory, currentMemory);
         ^
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 5 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:214:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: +dirty %ld bytes (from %ld to %ld)", m_logString, memoryDiff, m_initialMemory, currentMemory);
         ^
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:214:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: +dirty %ld bytes (from %ld to %ld)", m_logString, memoryDiff, m_initialMemory, currentMemory);
         ^
../../Source/WTF/wtf/Assertions.h:346:105: error: format ‘%ld’ expects argument of type ‘long int’, but argument 4 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
 #define LOG(channel, ...) WTFLog(&JOIN_LOG_CHANNEL_WITH_PREFIX(LOG_CHANNEL_PREFIX, channel), __VA_ARGS__)
                                                                                                         ^
../../Source/WebCore/platform/linux/MemoryPressureHandlerLinux.cpp:216:9: note: in expansion of macro ‘LOG’
         LOG(MemoryPressure, "Pressure relief: %s: =dirty (at %ld bytes)", m_logString, currentMemory);
         ^
cc1plus: all warnings being treated as errors
ninja: build stopped: subcommand failed.

[Shivakumar J M]

Created attachment 244498 [details]
Patch

Fixed 32 bit debug build error by using proper format specifier.

[Shivakumar J M]

Fixed 32 bit debug build error by using proper format specifier in LOG(), we can also use type cast to static_cast<long int> to fix the error.

[Csaba Osztrogonác]

Comment on attachment 244498 [details]
Patch

LGTM, r=me

[Csaba Osztrogonác]

Comment on attachment 244498 [details]
Patch

no, it won't be good, because it would break 64 bit build.

[Csaba Osztrogonác]

size_t is unsigned int on 32 bit and long unsigned int on 64 bit.
So it should be casted to long unsigned int unconditionally.

[Shivakumar J M]

Created attachment 244502 [details]
Patch-Updated-Review1

Updated the patch to use %lu and apply static_cast<unsigned long> for printing logs.

[WebKit Commit Bot]

Comment on attachment 244502 [details]
Patch-Updated-Review1

Clearing flags on attachment: 244502

Committed r178349: <http://trac.webkit.org/changeset/178349>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[ChangSeok Oh]

Thanks for the fix. =) I didn't think 32-bit machine support.