From 1a57ab0c923f269d1d7c29dfe4634c0ae66d69ac Mon Sep 17 00:00:00 2001 From: Sachin Monga Date: Wed, 10 May 2023 13:59:21 -0400 Subject: Added Redirects to longdouble error functions [BZ #29033] This patch redirects the error functions to the appropriate longdouble variants which enables the compiler to optimize for the abi ieeelongdouble. Signed-off-by: Sachin Monga --- misc/Makefile | 2 +- misc/bits/error-ldbl.h | 45 ++++++++++++++++++++++++ misc/sys/cdefs.h | 3 +- misc/tst-ldbl-errorfptr.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 135 insertions(+), 2 deletions(-) create mode 100644 misc/tst-ldbl-errorfptr.c (limited to 'misc') diff --git a/misc/Makefile b/misc/Makefile index 1a09f777fa..9f42321206 100644 --- a/misc/Makefile +++ b/misc/Makefile @@ -90,7 +90,7 @@ tests := tst-dirname tst-tsearch tst-fdset tst-mntent tst-hsearch \ tst-preadvwritev2 tst-preadvwritev64v2 tst-warn-wide \ tst-ldbl-warn tst-ldbl-error tst-dbl-efgcvt tst-ldbl-efgcvt \ tst-mntent-autofs tst-syscalls tst-mntent-escape tst-select \ - tst-ioctl + tst-ioctl tst-ldbl-errorfptr tests-time64 := \ tst-select-time64 \ diff --git a/misc/bits/error-ldbl.h b/misc/bits/error-ldbl.h index 599a7d6e06..bbc4956f68 100644 --- a/misc/bits/error-ldbl.h +++ b/misc/bits/error-ldbl.h @@ -20,5 +20,50 @@ # error "Never include directly; use instead." #endif +#if defined __extern_always_inline && defined __va_arg_pack +extern void __REDIRECT_LDBL (__error_alias, (int __status, int __errnum, + const char *__format, ...), error) + __attribute__ ((__format__ (__printf__, 3, 4))); +extern void __REDIRECT_LDBL (__error_noreturn, (int __status, int __errnum, + const char *__format, ...), error) + __attribute__ ((__noreturn__, __format__ (__printf__, 3, 4))); + + +/* If we know the function will never return make sure the compiler + realizes that, too. */ +__extern_always_inline void +error (int __status, int __errnum, const char *__format, ...) +{ + if (__builtin_constant_p (__status) && __status != 0) + __error_noreturn (__status, __errnum, __format, __va_arg_pack ()); + else + __error_alias (__status, __errnum, __format, __va_arg_pack ()); +} + + +extern void __REDIRECT_LDBL (__error_at_line_alias, (int __status, int __errnum, + const char *__fname, unsigned int __line, + const char *__format, ...), error_at_line) + __attribute__ ((__format__ (__printf__, 5, 6))); +extern void __REDIRECT_LDBL (__error_at_line_noreturn, (int __status, int __errnum, + const char *__fname, unsigned int __line, + const char *__format, ...), error_at_line) + __attribute__ ((__noreturn__, __format__ (__printf__, 5, 6))); + + +/* If we know the function will never return make sure the compiler + realizes that, too. */ +__extern_always_inline void +error_at_line (int __status, int __errnum, const char *__fname, + unsigned int __line, const char *__format, ...) +{ + if (__builtin_constant_p (__status) && __status != 0) + __error_at_line_noreturn (__status, __errnum, __fname, __line, __format, + __va_arg_pack ()); + else + __error_at_line_alias (__status, __errnum, __fname, __line, + __format, __va_arg_pack ()); +} +#endif __LDBL_REDIR_DECL (error) __LDBL_REDIR_DECL (error_at_line) diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h index 9a07e297a6..393d9091d9 100644 --- a/misc/sys/cdefs.h +++ b/misc/sys/cdefs.h @@ -576,6 +576,8 @@ # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir # define __LDBL_REDIR_DECL(name) \ extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128")); +# define __REDIRECT_LDBL(name, proto, alias) \ + name proto __asm (__ASMNAME ("__" #alias "ieee128")) /* Alias name defined automatically, with leading underscores. */ # define __LDBL_REDIR2_DECL(name) \ @@ -593,7 +595,6 @@ __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128) /* Unused. */ -# define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth # else diff --git a/misc/tst-ldbl-errorfptr.c b/misc/tst-ldbl-errorfptr.c new file mode 100644 index 0000000000..155932afe1 --- /dev/null +++ b/misc/tst-ldbl-errorfptr.c @@ -0,0 +1,87 @@ +/* Test for the long double redirections in error* functions + when they are returned as function pointer BZ #29033. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 +# define LDBL_NAME(alias) "__" #alias "ieee128" +#elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH +# define LDBL_NAME(alias) "__nldbl_" #alias +#else +# define LDBL_NAME(alias) #alias +#endif + +typedef void (*error_func_t) (int, int, const char*, ...); +typedef void (*error_at_line_func_t) (int, int, const char*, + unsigned int, const char*, ...); + +error_func_t +__attribute__ ((noinline)) +get_error_func (void) { + return &error; +} + +error_at_line_func_t +__attribute__ ((noinline)) +get_error_at_line_func (void) { + return &error_at_line; +} + +static int +do_test (void) +{ + /* Prepare the symbol names as per long double standards */ + char *error_sym = NULL; + char *error_sym_at_line = NULL; + error_sym = (char *) LDBL_NAME(error); + error_sym_at_line = (char *) LDBL_NAME(error_at_line); + TEST_VERIFY (error_sym != NULL && error_sym_at_line != NULL); + /* Map the function pointers to appropriate redirected error symbols */ + error_func_t fp; + fp = get_error_func (); + if (fp != xdlsym (RTLD_DEFAULT, error_sym)) + { + printf ("FAIL: fp=%p error_sym=%p\n", fp, error_sym); + return 1; + } + + error_at_line_func_t fpat; + fpat = get_error_at_line_func (); + if (fpat != xdlsym (RTLD_DEFAULT, error_sym_at_line)) + { + printf ("FAIL: fpat=%p error_sym_at_line=%p\n", + fpat, error_sym_at_line); + return 1; + } + + return 0; +} + +#include -- cgit 1.4.1