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* [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning @ 2015-02-02 18:25 sirl at gcc dot gnu.org 2015-09-21 13:52 ` [Bug sanitizer/64906] " mpolacek at gcc dot gnu.org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: sirl at gcc dot gnu.org @ 2015-02-02 18:25 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 Bug ID: 64906 Summary: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: sanitizer Assignee: unassigned at gcc dot gnu.org Reporter: sirl at gcc dot gnu.org CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org, jakub at gcc dot gnu.org, kcc at gcc dot gnu.org This testcase produces a false warning when compiled with -O2 -fsanitize=integer-divide-by-zero -Wmaybe-uninitialized: struct s { __SIZE_TYPE__ size; unsigned int flags; }; int testf(struct s * source) { __SIZE_TYPE__ msize = 0; if ((source->flags & 88) ? (__SIZE_TYPE__) 43 * 8 : 0) msize = source->size / ((source->flags & 88) ? (__SIZE_TYPE__) 43 * 8: 0); return msize; } test.c: In function 'testf': test.c:11:8: warning: 'iftmp.1' may be used uninitialized in this function [-Wmaybe-uninitialized] msize = source->size / ((source->flags & 88) ? (__SIZE_TYPE__) 43 * 8: 0); ^ ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/64906] -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org @ 2015-09-21 13:52 ` mpolacek at gcc dot gnu.org 2015-09-22 13:21 ` mpolacek at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-09-21 13:52 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2015-09-21 CC| |mpolacek at gcc dot gnu.org Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org Target Milestone|--- |5.3 Ever confirmed|0 |1 --- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- I'll have a look. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/64906] -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org 2015-09-21 13:52 ` [Bug sanitizer/64906] " mpolacek at gcc dot gnu.org @ 2015-09-22 13:21 ` mpolacek at gcc dot gnu.org 2015-09-22 14:06 ` mpolacek at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-09-22 13:21 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 --- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- int testf (int f, int s) { int ret = 0; if (f) ret = s / (f ? (unsigned long) 8 : 0); return ret; } ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/64906] -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org 2015-09-21 13:52 ` [Bug sanitizer/64906] " mpolacek at gcc dot gnu.org 2015-09-22 13:21 ` mpolacek at gcc dot gnu.org @ 2015-09-22 14:06 ` mpolacek at gcc dot gnu.org 2015-09-25 9:51 ` mpolacek at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-09-22 14:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 --- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> --- I'm testing a fix. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/64906] -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org ` (2 preceding siblings ...) 2015-09-22 14:06 ` mpolacek at gcc dot gnu.org @ 2015-09-25 9:51 ` mpolacek at gcc dot gnu.org 2015-09-25 10:46 ` mpolacek at gcc dot gnu.org 2015-09-25 10:47 ` mpolacek at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-09-25 9:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 --- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Fri Sep 25 09:50:29 2015 New Revision: 228112 URL: https://gcc.gnu.org/viewcvs?rev=228112&root=gcc&view=rev Log: PR sanitizer/64906 * c-ubsan.c (ubsan_instrument_division): Also pre-evaluate OP1. * c-c++-common/ubsan/pr64906.c: New test. Added: trunk/gcc/testsuite/c-c++-common/ubsan/pr64906.c Modified: trunk/gcc/c-family/ChangeLog trunk/gcc/c-family/c-ubsan.c trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/64906] -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org ` (3 preceding siblings ...) 2015-09-25 9:51 ` mpolacek at gcc dot gnu.org @ 2015-09-25 10:46 ` mpolacek at gcc dot gnu.org 2015-09-25 10:47 ` mpolacek at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-09-25 10:46 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 --- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Fri Sep 25 10:46:03 2015 New Revision: 228113 URL: https://gcc.gnu.org/viewcvs?rev=228113&root=gcc&view=rev Log: PR sanitizer/64906 * c-ubsan.c (ubsan_instrument_division): Also pre-evaluate OP1. * c-c++-common/ubsan/pr64906.c: New test. Added: branches/gcc-5-branch/gcc/testsuite/c-c++-common/ubsan/pr64906.c Modified: branches/gcc-5-branch/gcc/c-family/ChangeLog branches/gcc-5-branch/gcc/c-family/c-ubsan.c branches/gcc-5-branch/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/64906] -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org ` (4 preceding siblings ...) 2015-09-25 10:46 ` mpolacek at gcc dot gnu.org @ 2015-09-25 10:47 ` mpolacek at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-09-25 10:47 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64906 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-09-25 10:47 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-02-02 18:25 [Bug sanitizer/64906] New: -fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning sirl at gcc dot gnu.org 2015-09-21 13:52 ` [Bug sanitizer/64906] " mpolacek at gcc dot gnu.org 2015-09-22 13:21 ` mpolacek at gcc dot gnu.org 2015-09-22 14:06 ` mpolacek at gcc dot gnu.org 2015-09-25 9:51 ` mpolacek at gcc dot gnu.org 2015-09-25 10:46 ` mpolacek at gcc dot gnu.org 2015-09-25 10:47 ` mpolacek at gcc dot gnu.org
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