Re: git: c27a89971805 - main - stdlib.h: add __noexcept to prototypes
Date: Fri, 02 Feb 2024 18:59:09 UTC
On Fri, Feb 02, 2024 at 11:36:35AM -0700, Warner Losh wrote: > On Fri, Feb 2, 2024, 11:28 AM Konstantin Belousov <kostikbel@gmail.com> > wrote: > > > On Fri, Feb 02, 2024 at 06:16:59PM +0000, Warner Losh wrote: > > > The branch main has been updated by imp: > > > > > > URL: > > https://cgit.FreeBSD.org/src/commit/?id=c27a89971805b176dcfa5a234f2ea6f6109d0a70 > > > > > > commit c27a89971805b176dcfa5a234f2ea6f6109d0a70 > > > Author: Lexi Winter <lexi@le-Fay.ORG> > > > AuthorDate: 2024-02-02 16:41:40 +0000 > > > Commit: Warner Losh <imp@FreeBSD.org> > > > CommitDate: 2024-02-02 18:11:17 +0000 > > > > > > stdlib.h: add __noexcept to prototypes > > > > > > The noexcept specifier is required on these functions in C++: > > > _Exit(), atexit(), quick_exit(), at_quick_exit(), abort(). > > > > > > MFC after: 2 weeks > > > > > > Reviewed by: imp > > > Pull Request: https://github.com/freebsd/freebsd-src/pull/1085 > > > --- > > > include/stdlib.h | 10 +++++----- > > > 1 file changed, 5 insertions(+), 5 deletions(-) > > > > > > diff --git a/include/stdlib.h b/include/stdlib.h > > > index ff8991d1fa94..f0687f01e6c7 100644 > > > --- a/include/stdlib.h > > > +++ b/include/stdlib.h > > > @@ -84,9 +84,9 @@ extern int __mb_cur_max; > > > extern int ___mb_cur_max(void); > > > #define MB_CUR_MAX ((size_t)___mb_cur_max()) > > > > > > -_Noreturn void abort(void); > > > +_Noreturn void abort(void) __noexcept; > > > int abs(int) __pure2; > > > -int atexit(void (* _Nonnull)(void)); > > > +int atexit(void (* _Nonnull)(void)) __noexcept; > > > double atof(const char *); > > > int atoi(const char *); > > > long atol(const char *); > > > @@ -154,7 +154,7 @@ unsigned long long > > > strtoull(const char * __restrict, char ** __restrict, int); > > > #endif /* __LONG_LONG_SUPPORTED */ > > > > > > -_Noreturn void _Exit(int); > > > +_Noreturn void _Exit(int) __noexcept; > > > #endif /* __ISO_C_VISIBLE >= 1999 */ > > > > > > /* > > > @@ -163,9 +163,9 @@ _Noreturn void _Exit(int); > > > #if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L > > > void * aligned_alloc(size_t, size_t) __malloc_like > > __alloc_align(1) > > > __alloc_size(2); > > > -int at_quick_exit(void (*)(void)); > > > +int at_quick_exit(void (*)(void)) __noexcept; > > > _Noreturn void > > > - quick_exit(int); > > > + quick_exit(int) __noexcept; > > This is wrong, libc quick_exit() does not provide such guarantees as > > implemented. More, being part of libc it cannot ever guarantee that ever > > (and call std::terminate if the requirement is violated). > > > > Making it such would require bringing some C++ ABI into libc which I > > object strongly. > > > > So is this just for quick_exit, or all the functions marked? Other functions are abort()/_Exit()/atexit(). No functions in this list call a user-provided functions, so they cannot raise exceptions. My objection is only against our quick_exit(). > > Warner > > > > > #endif /* __ISO_C_VISIBLE >= 2011 */ > > > /* > > > * Extensions made by POSIX relative to C. > >