Re: [Qemu-trivial] [PATCH 1/3] Add support for target helper functions which don't return

[Stefan Weil <sw@weilnetz.de>]

Am 18.03.2012 23:14, schrieb Stefan Weil:
> Most functions which handle exceptions don't return.
>
> With a compiler attribute (added by QEMU_NORETURN),
> gcc can optimize the code.
>
> Signed-off-by: Stefan Weil<sw@weilnetz.de>
> ---
>   def-helper.h |    7 +++++++
>   1 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/def-helper.h b/def-helper.h
> index 0e70c31..b98ff69 100644
> --- a/def-helper.h
> +++ b/def-helper.h
> @@ -39,6 +39,7 @@
>   #endif
>   #define dh_alias_ptr ptr
>   #define dh_alias_void void
> +#define dh_alias_noreturn noreturn
>   #define dh_alias_env ptr
>   #define dh_alias(t) glue(dh_alias_, t)
>
> @@ -52,36 +53,42 @@
>   #define dh_ctype_tl target_ulong
>   #define dh_ctype_ptr void *
>   #define dh_ctype_void void
> +#define dh_ctype_noreturn void QEMU_NORETURN
>   #define dh_ctype_env CPUArchState *
>   #define dh_ctype(t) dh_ctype_##t
>
>   /* We can't use glue() here because it falls foul of C preprocessor
>      recursive expansion rules.  */
>   #define dh_retvar_decl0_void void
> +#define dh_retvar_decl0_noreturn void
>   #define dh_retvar_decl0_i32 TCGv_i32 retval
>   #define dh_retvar_decl0_i64 TCGv_i64 retval
>   #define dh_retvar_decl0_ptr TCGv_ptr retval
>   #define dh_retvar_decl0(t) glue(dh_retvar_decl0_, dh_alias(t))
>
>   #define dh_retvar_decl_void
> +#define dh_retvar_decl_noreturn
>   #define dh_retvar_decl_i32 TCGv_i32 retval,
>   #define dh_retvar_decl_i64 TCGv_i64 retval,
>   #define dh_retvar_decl_ptr TCGv_ptr retval,
>   #define dh_retvar_decl(t) glue(dh_retvar_decl_, dh_alias(t))
>
>   #define dh_retvar_void TCG_CALL_DUMMY_ARG
> +#define dh_retvar_noreturn TCG_CALL_DUMMY_ARG
>   #define dh_retvar_i32 GET_TCGV_i32(retval)
>   #define dh_retvar_i64 GET_TCGV_i64(retval)
>   #define dh_retvar_ptr GET_TCGV_ptr(retval)
>   #define dh_retvar(t) glue(dh_retvar_, dh_alias(t))
>
>   #define dh_is_64bit_void 0
> +#define dh_is_64bit_noreturn 0
>   #define dh_is_64bit_i32 0
>   #define dh_is_64bit_i64 1
>   #define dh_is_64bit_ptr (TCG_TARGET_REG_BITS == 64)
>   #define dh_is_64bit(t) glue(dh_is_64bit_, dh_alias(t))
>
>   #define dh_is_signed_void 0
> +#define dh_is_signed_noreturn 0
>   #define dh_is_signed_i32 0
>   #define dh_is_signed_s32 1
>   #define dh_is_signed_i64 0
>    

I'm sorry, these three patches should have been sent to qemu-devel,
not qemu-trivial. Please ignore them for qemu-trivial.

Best regards,

Stefan W.