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* [Bug c++/91235] Array size expression is implicitly casted to unsigned long type [not found] <bug-91235-4@http.gcc.gnu.org/bugzilla/> @ 2021-08-24 22:16 ` pinskia at gcc dot gnu.org 2021-08-25 16:05 ` msebor at gcc dot gnu.org 1 sibling, 0 replies; 2+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-08-24 22:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91235 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I think the warning is correct. there is no negative sizes; only size_t sizes for array. ^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/91235] Array size expression is implicitly casted to unsigned long type [not found] <bug-91235-4@http.gcc.gnu.org/bugzilla/> 2021-08-24 22:16 ` [Bug c++/91235] Array size expression is implicitly casted to unsigned long type pinskia at gcc dot gnu.org @ 2021-08-25 16:05 ` msebor at gcc dot gnu.org 1 sibling, 0 replies; 2+ messages in thread From: msebor at gcc dot gnu.org @ 2021-08-25 16:05 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91235 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |INVALID CC| |msebor at gcc dot gnu.org --- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> --- Both the warning and the analysis in comment #0 are correct. The code tries to allocate an excessively large VLA (the -1 converts to SIZE_MAX): ;; Function baz (baz, funcdef_no=1, decl_uid=1948, cgraph_uid=2, symbol_order=1) In function ‘bar’, inlined from ‘baz’ at pr91235.c:14:5: pr91235.c:7:14: warning: argument to variable-length array is too large [-Wvla-larger-than=] 7 | char a[(int)(n == 2 ? -1 : 0)]; | ^ pr91235.c:7:14: note: limit is 9223372036854775807 bytes, but argument is 18446744073709551615 void baz () { char[0:D.1971] * a.2; void * saved_stack.3_2; <bb 2> [local count: 1073741824]: saved_stack.3_2 = __builtin_stack_save (); a.2_3 = __builtin_alloca_with_align (18446744073709551615, 8); <<< -Wvla-larger-than foo (a.2_3); __builtin_stack_restore (saved_stack.3_2); return; } ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-08-25 16:05 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-91235-4@http.gcc.gnu.org/bugzilla/> 2021-08-24 22:16 ` [Bug c++/91235] Array size expression is implicitly casted to unsigned long type pinskia at gcc dot gnu.org 2021-08-25 16:05 ` msebor at gcc dot gnu.org
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