[asan] Target hook for shadow memory offset

[Diego Novillo]

On 2012-10-11 10:32 , Jakub Jelinek wrote:

> 2012-10-11  Jakub Jelinek  <jakub@redhat.com>
>
> 	* toplev.c (process_options): Warn and turn off -fasan
> 	if not supported by target.
> 	* asan.c: Include target.h.
> 	(asan_scale, asan_offset_log_32, asan_offset_log_64,
> 	asan_offset_log): Removed.
> 	(build_check_stmt): Use ASAN_SHADOW_SHIFT and
> 	targetm.asan_shadow_offset ().
> 	(asan_instrument): Don't initialize asan_offset_log.
> 	* asan.h (ASAN_SHADOW_SHIFT): Define.
> 	* target.def (TARGET_ASAN_SHADOW_OFFSET): New hook.
> 	* doc/tm.texi.in (TARGET_ASAN_SHADOW_OFFSET): Add it.
> 	* doc/tm.texi: Regenerated.
> 	* Makefile.in (asan.o): Depend on $(TARGET_H).
> 	* config/i386/i386.c (ix86_asan_shadow_offset): New function.
> 	(TARGET_ASAN_SHADOW_OFFSET): Define.

OK with HJ's suggestion for 64 bit pointer support.


Diego.