Re: [PATCH] correct formatting of function pointers in -Warray-bounds (PR 101601)

[Jeff Law <jeffreyalaw@gmail.com>]

On 7/27/2021 2:45 PM, Martin Sebor via Gcc-patches wrote:
> When mentioning the type of the accessed object -Warray-bounds
> treats singleton objects as arrays of one element for simplicity.
> But because the code doesn't distinguish between function and
> object pointers, a warning for an out-of-bounds index into
> a singleton function pointer object attempts to create an array
> of one function.  Since arrays of functions are invalid,
> the helper function the code calls fails with an error issued
> to the user.
>
> To avoid this the attached patch avoids this singleton-to-array
> shortcut for function pointers.  Tested on x86_64-linux.
>
> Martin
>
>
> gcc-101601.diff
>
> PR middle-end/101601 - [12 Regression] -Warray-bounds triggers error: arrays of functions are not meaningful
>
> 	PR middle-end/101601
>
> gcc/ChangeLog:
>
> 	* gimple-array-bounds.cc (array_bounds_checker::check_mem_ref): Remove
> 	a pointless test.
> 	Handle pointers to functions.
>
> gcc/testsuite/ChangeLog:
>
> 	* g++.dg/warn/Warray-bounds-25.C: New test.
> 	* gcc.dg/Warray-bounds-85.c: New test.
OK
jeff