Re: [PATCH 3/3] Mark various cold functions as __COLD

[Samuel Thibault]

It looks sensible to me indeed, any opinion from somebody else?




Sergey Bugaev, le sam. 29 avril 2023 16:12:23 +0300, a ecrit:
> GCC docs explicitly list perror () as a good candidate for using
> __attribute__ ((cold)). So apply __COLD to perror () and similar
> functions.
> 
> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
> ---
>  include/error.h |  4 ++--
>  libio/stdio.h   |  2 +-
>  misc/err.h      | 12 ++++++------
>  misc/error.h    |  4 ++--
>  4 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/include/error.h b/include/error.h
> index 9e96262f..4db67cba 100644
> --- a/include/error.h
> +++ b/include/error.h
> @@ -5,11 +5,11 @@
>  
>  void
>  __error_internal (int status, int errnum, const char *message,
> -               va_list args, unsigned int mode_flags);
> +               va_list args, unsigned int mode_flags) __COLD;
>  
>  void
>  __error_at_line_internal (int status, int errnum, const char *file_name,
>                         unsigned int line_number, const char *message,
> -                       va_list args, unsigned int mode_flags);
> +                       va_list args, unsigned int mode_flags) __COLD;
>  
>  #endif
> diff --git a/libio/stdio.h b/libio/stdio.h
> index 45ddafdf..2387590d 100644
> --- a/libio/stdio.h
> +++ b/libio/stdio.h
> @@ -859,7 +859,7 @@ extern int ferror_unlocked (FILE *__stream) __THROW __wur;
>  
>     This function is a possible cancellation point and therefore not
>     marked with __THROW.  */
> -extern void perror (const char *__s);
> +extern void perror (const char *__s) __COLD;
>  
>  
>  #ifdef       __USE_POSIX
> diff --git a/misc/err.h b/misc/err.h
> index 0c752465..43df3a57 100644
> --- a/misc/err.h
> +++ b/misc/err.h
> @@ -32,9 +32,9 @@ __BEGIN_DECLS
>  /* Print "program: ", FORMAT, ": ", the standard error string for errno,
>     and a newline, on stderr.  */
>  extern void warn (const char *__format, ...)
> -     __attribute__ ((__format__ (__printf__, 1, 2)));
> +     __attribute__ ((__format__ (__printf__, 1, 2))) __COLD;
>  extern void vwarn (const char *__format, __gnuc_va_list)
> -     __attribute__ ((__format__ (__printf__, 1, 0)));
> +     __attribute__ ((__format__ (__printf__, 1, 0))) __COLD;
>  
>  /* Likewise, but without ": " and the standard error string.  */
>  extern void warnx (const char *__format, ...)
> @@ -44,13 +44,13 @@ extern void vwarnx (const char *__format, __gnuc_va_list)
>  
>  /* Likewise, and then exit with STATUS.  */
>  extern void err (int __status, const char *__format, ...)
> -     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 3)));
> +     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 3))) __COLD;
>  extern void verr (int __status, const char *__format, __gnuc_va_list)
> -     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 0)));
> +     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 0))) __COLD;
>  extern void errx (int __status, const char *__format, ...)
> -     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 3)));
> +     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 3))) __COLD;
>  extern void verrx (int __status, const char *, __gnuc_va_list)
> -     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 0)));
> +     __attribute__ ((__noreturn__, __format__ (__printf__, 2, 0))) __COLD;
>  
>  #include <bits/floatn.h>
>  #if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
> diff --git a/misc/error.h b/misc/error.h
> index 185b39c6..4fbd46c7 100644
> --- a/misc/error.h
> +++ b/misc/error.h
> @@ -29,11 +29,11 @@ __BEGIN_DECLS
>     If STATUS is nonzero, terminate the program with `exit (STATUS)'.  */
>  
>  extern void error (int __status, int __errnum, const char *__format, ...)
> -     __attribute__ ((__format__ (__printf__, 3, 4)));
> +     __attribute__ ((__format__ (__printf__, 3, 4))) __COLD;
>  
>  extern void error_at_line (int __status, int __errnum, const char *__fname,
>                          unsigned int __lineno, const char *__format, ...)
> -     __attribute__ ((__format__ (__printf__, 5, 6)));
> +     __attribute__ ((__format__ (__printf__, 5, 6))) __COLD;
>  
>  /* If NULL, error will flush stdout, then print on stderr the program
>     name, a colon and a space.  Otherwise, error will call this
> -- 
> 2.40.1
> 

-- 
Samuel
---
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