93931 2012-08-13 22:17:40 -0700 [EFL] Remove alloca usage. 2012-08-17 05:19:08 -0700 1 1 1 Unclassified WebKit WebKit EFL 528+ (Nightly build) Other Linux RESOLVED FIXED P2 Normal --- 1 kangil.han webkit-unassigned g.czajkowski gyuyoung.kim lucas.de.marchi rakuco webkit.review.bot oldest_to_newest 694505 0 kangil.han 2012-08-13 22:17:40 -0700 Fixed compile time warning with respect to array and uninitialized variables. 694507 1 158214 kangil.han 2012-08-13 22:20:06 -0700 Created attachment 158214 patch 694540 2 158214 rakuco 2012-08-13 23:09:48 -0700 Comment on attachment 158214 patch View in context: https://bugs.webkit.org/attachment.cgi?id=158214&action=review > Source/WebCore/platform/efl/ScrollbarEfl.cpp:174 > - char buffer[sizeof(Edje_Message_Float_Set) + sizeof(double)]; > - Edje_Message_Float_Set* message = reinterpret_cast<Edje_Message_Float_Set*>(buffer); > + Edje_Message_Float_Set* message = static_cast<Edje_Message_Float_Set*>(alloca(sizeof(Edje_Message_Float_Set) + sizeof(double))); Whenever you change weird constructs like this, you must check the logs and use svn blame first -- there is a reason for not using alloca() here. 694648 3 158256 kangil.han 2012-08-14 01:23:43 -0700 Created attachment 158256 patch Under current edje implementation, it seems we wouldn't avoid malloc usage even in cpp source code. :-( 694665 4 g.czajkowski 2012-08-14 01:45:17 -0700 (In reply to comment #3) > Created an attachment (id=158256) [details] > patch > > Under current edje implementation, it seems we wouldn't avoid malloc usage even in cpp source code. :-( Informal r- from my side because of two reason: 1) According to WebKit-Efl style we should avoid memory allocation with malloc and friends. new operator is preferred. 2) I don't see any benefits of allocating/freeing memory in this case. You can get more information here https://bugs.webkit.org/show_bug.cgi?id=72017. 694679 5 kangil.han 2012-08-14 01:54:32 -0700 (In reply to comment #4) > Informal r- from my side because of two reason: > > 1) According to WebKit-Efl style we should avoid memory allocation with malloc and friends. new operator is preferred. > > 2) I don't see any benefits of allocating/freeing memory in this case. > > You can get more information here https://bugs.webkit.org/show_bug.cgi?id=72017. Would you please suggest a way to remove build warning message under this circumstances? 694722 6 158269 kangil.han 2012-08-14 02:31:32 -0700 Created attachment 158269 patch How about this? 694733 7 g.czajkowski 2012-08-14 03:06:52 -0700 (In reply to comment #6) > Created an attachment (id=158269) [details] > patch > > How about this? Thanks for the patch and newly introduced solution how to avoid problems with a little problematic Edje_Message_Float_Set struct. In the origin code 'buffer' is created on stack, so we don't need to take of freeing memory and possibles memory leaks but compiler complains on 'message' pointer after reinterpret_cast that it is not initialized. Your patch creates 'buffer' on heap and it's deleted when function returns (delete [] buffer). Additionally you have to twice cast, char * -> void and then void* -> Edje_Message_Float_Set*. Is it really worth to resolve this compilation warning? Kubo what do you think? 694911 8 158269 rakuco 2012-08-14 06:36:04 -0700 Comment on attachment 158269 patch View in context: https://bugs.webkit.org/attachment.cgi?id=158269&action=review > Source/WebCore/ChangeLog:17 > + * platform/graphics/harfbuzz/ng/HarfBuzzShaper.cpp: > + (WebCore::HarfBuzzShaper::selectionRect): fix 'toX and fromX may be used uninitialized in this function' warning. Note that this isn't related to the bug title anymore :-) 694912 9 rakuco 2012-08-14 06:37:43 -0700 (In reply to comment #7) > Is it really worth to resolve this compilation warning? > Kubo what do you think? I tried the following snippet here: char buffer[sizeof(Edje_Message_Float_Set) + sizeof(double)]; Edje_Message_Float_Set *message = reinterpret_cast<Edje_Message_Float_Set*>(buffer); and neither gcc 4.7.1 nor clang 3.1 with -Wall and -Wextra have raised any warning such as the one Kangil mentions in the ChangeLog. Kangil, what compiler are you using and what flags are being passed to it when building these files? 696504 10 kangil.han 2012-08-15 16:45:06 -0700 (In reply to comment #9) > I tried the following snippet here: > > char buffer[sizeof(Edje_Message_Float_Set) + sizeof(double)]; > Edje_Message_Float_Set *message = reinterpret_cast<Edje_Message_Float_Set*>(buffer); > > and neither gcc 4.7.1 nor clang 3.1 with -Wall and -Wextra have raised any warning such as the one Kangil mentions in the ChangeLog. > > Kangil, what compiler are you using and what flags are being passed to it when building these files? Here it is. :-) { gcc (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1 /home/hankangil/dev/WebKit/webkit-gtk/WebKit/Source/WebCore/platform/efl/ScrollbarEfl.cpp:184:23: warning: array subscript is above array bounds [-Warray-bounds] /home/hankangil/dev/WebKit/webkit-gtk/WebKit/Source/WebCore/platform/efl/ScrollbarEfl.cpp:186:23: warning: array subscript is above array bounds [-Warray-bounds] } (In reply to comment #8) > Note that this isn't related to the bug title anymore :-) I will select better title after figuring out the direction how I could resolve build warning with respect to strange edje message stuff. ;-) 696573 11 rakuco 2012-08-15 17:57:33 -0700 (In reply to comment #10) > > and neither gcc 4.7.1 nor clang 3.1 with -Wall and -Wextra have raised any warning such as the one Kangil mentions in the ChangeLog. > > > > Kangil, what compiler are you using and what flags are being passed to it when building these files? > > Here it is. :-) > { > gcc (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1 Right. I've tried the following snippet with gcc 4.6.3 and it didn't produce any warnings either: #include <Edje.h> int main() { char buffer[sizeof(Edje_Message_Float_Set) + sizeof(double)]; Edje_Message_Float_Set* message = reinterpret_cast<Edje_Message_Float_Set*>(buffer); message->count = 2; message->val[0] = 0.0; message->val[1] = 1.0; return 0; } Does this code make your compiler produce any kind of warning? 696584 12 kangil.han 2012-08-15 18:12:01 -0700 (In reply to comment #11) > Does this code make your compiler produce any kind of warning? I used 'g++ (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1' and found *NO* error on your code snippet. This is very interesting!! 696774 13 kangil.han 2012-08-15 23:09:41 -0700 Here is interesting result I've found. It depends on gcc optimization flag. -O0(no optimization) : no warning message. -O1 : no warning message. -O2 : test.cpp:16:19: warning: array subscript is above array bounds [-Warray-bounds] -O3(actually used in efl build) : test.cpp:16:19: warning: array subscript is above array bounds [-Warray-bounds] Given circumstances, my two cents on this, I know edje has implemented unusually, using *new* keyword would be unavoidable. rakuco, grzegorz: how do you think about this? 696789 14 rakuco 2012-08-15 23:45:20 -0700 OK, I've managed to reproduce that warning with my code snippet by calling edje_object_message_send() in it (clang still doesn't produce any warning). There are two possible solutions here: 1) Use plain old malloc() here specifying the amount of bytes we want to allocate and avoiding all those casts. 2) Refining Kangil's proposed patch. Solution 2) is interesting because the static_cast<void*>() is not necessary, so we can remove some bloat. We could also pass the allocated memory to an OwnPtr, thus avoiding the need to free the memory manually. Kangil, can you produce a new patch following those suggestions (please also refrain from changing variable names to keep it as short as possible)? 696796 15 kangil.han 2012-08-15 23:52:57 -0700 (In reply to comment #14) > OK, I've managed to reproduce that warning with my code snippet by calling edje_object_message_send() in it (clang still doesn't produce any warning). > > There are two possible solutions here: > > 1) Use plain old malloc() here specifying the amount of bytes we want to allocate and avoiding all those casts. > > 2) Refining Kangil's proposed patch. > > Solution 2) is interesting because the static_cast<void*>() is not necessary, so we can remove some bloat. We could also pass the allocated memory to an OwnPtr, thus avoiding the need to free the memory manually. > > Kangil, can you produce a new patch following those suggestions (please also refrain from changing variable names to keep it as short as possible)? Sure, I will get back with an updated one. ;-) Thanks! 696814 16 g.czajkowski 2012-08-16 00:14:19 -0700 (In reply to comment #14) > OK, I've managed to reproduce that warning with my code snippet by calling edje_object_message_send() in it (clang still doesn't produce any warning). > > There are two possible solutions here: > > 1) Use plain old malloc() here specifying the amount of bytes we want to allocate and avoiding all those casts. > How about using new placement instead? Does it produce warning too? I couldn't verify it as I am facing problem to access svn.enlightenment.org and git.webkit.org :/ sorry char* buffer = new char[sizeof(Edje_Message_Float_Set) + sizeof(double)]) Edje_Message_Float_Set* message = new(buffer) Edje_Message_Float_Set; This plus smart pointer may be another solution for us. 696871 17 rakuco 2012-08-16 01:00:39 -0700 (In reply to comment #16) > How about using new placement instead? Does it produce warning too? I don't think you can use placement new here, as Edje_Message_Float_Set is a C type that does not have a constructor or a placement new overload. 696879 18 g.czajkowski 2012-08-16 01:14:15 -0700 (In reply to comment #17) > (In reply to comment #16) > > How about using new placement instead? Does it produce warning too? > > I don't think you can use placement new here, as Edje_Message_Float_Set is a C type that does not have a constructor or a placement new overload. Hmm, I've been trying to use this one at https://bugs.webkit.org/show_bug.cgi?id=72017 (see 5th patch). As I remember it has worked. 696885 19 kangil.han 2012-08-16 01:19:12 -0700 (In reply to comment #18) > Hmm, I've been trying to use this one at https://bugs.webkit.org/show_bug.cgi?id=72017 (see 5th patch). As I remember it has worked. Don't worry. I will test your code snippet and get back with result. :-) 696931 20 kangil.han 2012-08-16 02:10:10 -0700 grzegorz's code snippet works. :-) rakuco, grzegorz: we can pick better one. which one would you prefer? 697166 21 rakuco 2012-08-16 08:26:50 -0700 (In reply to comment #20) > grzegorz's code snippet works. :-) Hmm, it was failing here because <new> had to be included in that snippet I was using. Go for the placement new version, as it is cleaner and conveys the intents better than the casts. Just for safety, please #include <new> as well to make sure the global placement new overload is available. 697898 22 kangil.han 2012-08-16 22:43:46 -0700 (In reply to comment #21) > Hmm, it was failing here because <new> had to be included in that snippet I was using. > > Go for the placement new version, as it is cleaner and conveys the intents better than the casts. Just for safety, please #include <new> as well to make sure the global placement new overload is available. new version has one drawback. it seems we couldn't use OwnPtr for this case. Would you prefer explicit *delete* usage? 697953 23 159017 kangil.han 2012-08-17 00:04:50 -0700 Created attachment 159017 patch 697972 24 159017 rakuco 2012-08-17 00:25:44 -0700 Comment on attachment 159017 patch View in context: https://bugs.webkit.org/attachment.cgi?id=159017&action=review > Source/WebCore/ChangeLog:3 > + [EFL] Remove alloca usage and fix compile warning in WebCore The original title about removing warnings from WebCore makes more sense here, as removing alloca is part of this process. > Source/WebCore/ChangeLog:9 > + To keep portable source code, alloca has been discouraged. > + Therefore, this patch removed alloca usage from EFL port. I would mention here that we're unifying the approaches for the creation of Edje_Message_Float_Set messages, and getting rid of alloca is part of it, since it is not portable. It'd also be good to mention the compiler warnings you were getting. > Source/WebCore/platform/efl/RenderThemeEfl.cpp:360 > + edje_object_message_send(entry->o, EDJE_MESSAGE_FLOAT_SET, 0, msg); See the comment in line 327; you do not need to send this message unconditionally. > Source/WebCore/platform/efl/RenderThemeEfl.cpp:450 > + EINA_LOG_ERR("Could not set file: %s", errmsg); Not really related to this patch. > Source/WebCore/platform/efl/ScrollbarEfl.cpp:175 > + Edje_Message_Float_Set* msg = new(buffer.get()) Edje_Message_Float_Set; The renaming of this variable makes the patch needlessly bigger. 698044 25 kangil.han 2012-08-17 01:35:49 -0700 (In reply to comment #24) > > Source/WebCore/platform/efl/RenderThemeEfl.cpp:360 > > + edje_object_message_send(entry->o, EDJE_MESSAGE_FLOAT_SET, 0, msg); > > See the comment in line 327; you do not need to send this message unconditionally. > I couldn't see your comment in line 327. What was that about? 698049 26 rakuco 2012-08-17 01:52:18 -0700 (In reply to comment #25) > I couldn't see your comment in line 327. What was that about? http://trac.webkit.org/browser/trunk/Source/WebCore/platform/efl/RenderThemeEfl.cpp#L327 698102 27 159060 kangil.han 2012-08-17 02:46:55 -0700 Created attachment 159060 patch 698107 28 159060 rakuco 2012-08-17 02:50:07 -0700 Comment on attachment 159060 patch Looks great, thanks! 698114 29 kangil.han 2012-08-17 02:53:30 -0700 (In reply to comment #28) > (From update of attachment 159060 [details]) > Looks great, thanks! Thanks for great review, too! 698132 30 g.czajkowski 2012-08-17 03:11:59 -0700 Informal r+ from my side too. 698142 31 kangil.han 2012-08-17 03:18:17 -0700 (In reply to comment #30) > Informal r+ from my side too. Thanks grzegorz. Your suggestion(using *new*) has helped me a lot. :-) 698226 32 159060 cgarcia 2012-08-17 05:14:10 -0700 Comment on attachment 159060 patch LGTM 698233 33 159060 webkit.review.bot 2012-08-17 05:19:01 -0700 Comment on attachment 159060 patch Clearing flags on attachment: 159060 Committed r125883: <http://trac.webkit.org/changeset/125883> 698234 34 webkit.review.bot 2012-08-17 05:19:08 -0700 All reviewed patches have been landed. Closing bug. 158214 2012-08-13 22:20:06 -0700 2012-08-14 01:23:43 -0700 patch build_warning_patch.txt text/plain 2326 kangil.han ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJDb3JlL0No YW5nZUxvZwppbmRleCAxOWQxY2U1Li5lM2Q3YjA5IDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViQ29y ZS9DaGFuZ2VMb2cKKysrIGIvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTcg QEAKKzIwMTItMDgtMTQgIEthbmdpbCBIYW4gIDxrYW5naWwuaGFuQHNhbXN1bmcuY29tPgorCisg ICAgICAgIFJlbW92ZSBXZWJDb3JlIGJ1aWxkIHdhcm5pbmcgbWVzc2FnZS4KKyAgICAgICAgaHR0 cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTkzOTMxCisKKyAgICAgICAgUmV2 aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgRml4ZWQgY29tcGlsZSB0aW1lIHdh cm5pbmcgd2l0aCByZXNwZWN0IHRvIGFycmF5IGFuZCB1bmluaXRpYWxpemVkIHZhcmlhYmxlcy4K KworICAgICAgICAqIHBsYXRmb3JtL2VmbC9TY3JvbGxiYXJFZmwuY3BwOgorICAgICAgICAoU2Ny b2xsYmFyRWZsOjp1cGRhdGVUaHVtYlBvc2l0aW9uQW5kUHJvcG9ydGlvbik6IGZpeCAnYXJyYXkg c3Vic2NyaXB0IGlzIGFib3ZlIGFycmF5IGJvdW5kcycgY29tcGlsZSB3YXJuaW5nLgorICAgICAg 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