30769 2009-10-26 04:30:16 -0700 [gcc/unix] Export WTF::fastMalloc, WTF::fastFree, WTF::fastCalloc, WTF::fastRealloc 2009-10-28 03:35:55 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 1 zecke webkit-unassigned darin oldest_to_newest 157730 0 zecke 2009-10-26 04:30:16 -0700 All non darwin gcc targets build JSC with -fvisibility=hidden hiding the FastMalloc functions. For malloc analysis it is handy to be able to preload an instrumented version of the above functions. The proposed change is to use __attribute__((visibility("default"))) on GCC systems. 157733 1 41859 zecke 2009-10-26 04:38:17 -0700 Created attachment 41859 First attempt to export these symbols Use __attribute__((visibility("default"))) to export the allocation functions again. On Mac these symbols are exported via the .exp file and available to the WebCore/WebKit library. 157756 2 41865 zecke 2009-10-26 07:08:41 -0700 Created attachment 41865 Export the symbols in libwebkit.so as well Export the FastMalloc functions in the .so file as well. This is the last step to be able to instrument a TCmalloc enabled libwebkit with memprof. 157768 3 41859 darin 2009-10-26 07:49:15 -0700 Comment on attachment 41859 First attempt to export these symbols > +#if COMPILER(GCC) && !PLATFORM(DARWIN) > +#define WTF_FAST_MALLOC_EXPORT __attribute__((visibility("default"))) > +#else > +#define WTF_FAST_MALLOC_EXPORT > +#endif Why ~PLATFORM(DARWIN)"? If you are using __attribute__ then you should also use __visibility__. Is it really helpful to do this just for these functions? Doesn't this need to be done consistently across the rest of JavaScriptCore? 157769 4 darin 2009-10-26 07:50:14 -0700 Oh, I see now. You're saying this is good "for malloc analysis". Still, why the !PLATFORM(DARWIN) part? Would this change cause a problem on that platform? 157773 5 zecke 2009-10-26 08:00:31 -0700 (In reply to comment #4) > Oh, I see now. You're saying this is good "for malloc analysis". Ironically I'm working/using a tool that went from Corel -> Eazel -> GNOME into my hands. I'm using LD_PRELOAD to load my version of malloc and this fails with a release build of WebKit. One option would have been to instrument the mmap/sbrk calls but then I just see calls to TCSystem_Alloc. > Still, why the !PLATFORM(DARWIN) part? Would this change cause a problem on > that platform? My assumption is that it is going to work as visibility should be okay with any gcc4.x release. On a mac build these symbols should have "default" visibility and saying they are default should be harmles. I just tried to minimize the risk of breaking a build on a file that is included by almost everything. 157774 6 zecke 2009-10-26 08:01:46 -0700 I'm going to build on Leopard tomorrow and will send an updated patch without the !PLATFORM(DARWIN) 158162 7 41945 zecke 2009-10-27 06:04:37 -0700 Created attachment 41945 Export fastMalloc, fastFree, fastRealloc, fastCalloc with normal linkage The leopard build was fine, removing the !PLATFORM(DARWIN). 158238 8 41865 darin 2009-10-27 10:12:41 -0700 Comment on attachment 41865 Export the symbols in libwebkit.so as well rs=me 158509 9 zecke 2009-10-28 03:35:55 -0700 Landed in r50204 and r50205. 41859 2009-10-26 04:38:17 -0700 2009-10-27 06:04:37 -0700 First attempt to export these symbols 0002-Export-fastMalloc-fastCalloc-fastRealloc-and-fastFre.patch text/plain 3422 zecke RnJvbSBkNWY4ODExNjRlZmIxMDdlYmQ0NzI4YWIzZDJjYmVlOTY5ZmUzMmNhIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBIb2xnZXIgSGFucyBQZXRlciBGcmV5dGhlciA8emVja2VAc2Vs 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