From patchwork Mon Feb 5 23:35:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zack Weinberg X-Patchwork-Id: 25831 Received: (qmail 80087 invoked by alias); 5 Feb 2018 23:35:07 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 79846 invoked by uid 89); 5 Feb 2018 23:35:06 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-25.7 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_SHORT, SPF_PASS, T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 spammy=surviving, acted X-HELO: mailbackend.panix.com From: Zack Weinberg To: libc-alpha@sourceware.org Cc: fweimer@redhat.com, joseph@codesourcery.com Subject: [PATCH v2 5/5] Post-cleanup 2: minimize _G_config.h. Date: Mon, 5 Feb 2018 18:35:00 -0500 Message-Id: In-Reply-To: References: MIME-Version: 1.0 In-Reply-To: References: Nearly everything in _G_config.h is either junk or more appropriately defined elsewhere: * _G_fpos_t, _G_fpos64_t, and _G_BUFSIZ are already completely unused. * All remaining uses of _G_va_list have been changed to __gnuc_va_list. * The definition of _G_HAVE_ST_BLKSIZE/_IO_HAVE_ST_BLKSIZE has been inlined into its sole use. * The complete definition of _G_iconv_t has been moved to libio.h and renamed _IO_iconv_t (all actual users used that name). * _G_IO_IO_FILE_VERSION is vestigial; some code cares whether _IO_stdin_used exists, but nothing looks at its value. I've preserved the value as a hardwired constant in csu/init.c. This means csu/init.c no longer needs to include anything. * Many of the headers included by _G_config.h were already being included directly by either either libio.h or stdio.h; the remaining ones were moved to libio.h. * _G_HAVE_MREMAP is still relevant, because mremap genuinely is a Linux extension; it's not in POSIX and as far as I can tell it's not available on the Hurd either. I also preserved _G_HAVE_MMAP, since it's conceivable someone would want to port glibc to a MMU-less, mmap-less environment in the future. Both are now always defined to 1/0 as is the current convention, instead of the older 1/undef convention. These are the only symbols still defined in _G_config.h. * The actual inclusion of _G_config.h moves from libio.h to libioP.h, as this is where a potential override of _G_HAVE_MMAP happens. * The #ifdef logic in libioP.h controlling _IO_JUMPS_OFFSET has been simplified. After this patch, the only surviving _G_ symbols are the struct tag names _G_fpos_t and _G_fpos64_t, which are preserved for the sake of C++ mangled names in applications, and _G_HAVE_MMAP and _G_HAVE_MREMAP, which do not seem worth renaming. Installed stripped libraries are unchanged by this patch. * bits/_G_config.h: Move back to sysdeps/generic/_G_config.h. Delete all contents except for definitions of _G_HAVE_MMAP and _G_HAVE_MREMAP. Add commentary explaining those two symbols. * sysdeps/unix/sysv/linux/bits/_G_config.h: Move back to sysdeps/unix/sysv/linux/_G_config.h. Make same content change as above. * libio/libio.h: Don't include bits/_G_config.h here. Include stddef.h with __need_wchar_t defined. Include bits/types/__mbstate_t.h, bits/types/wint_t.h, and gconv.h. Define _IO_iconv_t here, directly. Don't define _IO_HAVE_ST_BLKSIZE. * libio/libioP.h: Include _G_config.h here. Move include of shlib-compat.h up with rest of includes. Simplify conditionals controlling definition of _IO_JUMPS_OFFSET. * csu/init.c: Remove always-true #if around entire file. Don't include stdio.h. Set _IO_stdin_used to hardwired constant 0x20001, and update commentary. * include/stdio.h, sysdeps/ieee754/ldbl-opt/nldbl-compat.h: Replace all uses of _G_va_list with __gnuc_va_list. * libio/filedoalloc.c: Use #if defined _STATBUF_ST_BLKSIZE instead of #if _IO_HAVE_ST_BLKSIZE. * libio/fileops.c: Test _G_HAVE_MREMAP with #if, not #ifdef. * libio/iofdopen.c, libio/iofopen.c: Test _G_HAVE_MMAP with #if, not #ifdef. --- bits/_G_config.h | 54 ------------------------------- csu/init.c | 13 +++----- include/stdio.h | 28 ++++++++-------- libio/filedoalloc.c | 2 +- libio/fileops.c | 2 +- libio/iofdopen.c | 4 +-- libio/iofopen.c | 2 +- libio/libio.h | 22 ++++++++++--- libio/libioP.h | 20 ++++++------ sysdeps/generic/_G_config.h | 15 +++++++++ sysdeps/ieee754/ldbl-opt/nldbl-compat.h | 13 ++++---- sysdeps/unix/sysv/linux/_G_config.h | 15 +++++++++ sysdeps/unix/sysv/linux/bits/_G_config.h | 55 -------------------------------- 13 files changed, 89 insertions(+), 156 deletions(-) delete mode 100644 bits/_G_config.h create mode 100644 sysdeps/generic/_G_config.h create mode 100644 sysdeps/unix/sysv/linux/_G_config.h delete mode 100644 sysdeps/unix/sysv/linux/bits/_G_config.h diff --git a/bits/_G_config.h b/bits/_G_config.h deleted file mode 100644 index 8c81bc42787..00000000000 --- a/bits/_G_config.h +++ /dev/null @@ -1,54 +0,0 @@ -/* This file is needed by libio to define various configuration parameters. - These are always the same in the GNU C library. */ - -#ifndef _BITS_G_CONFIG_H -#define _BITS_G_CONFIG_H 1 - -/* Define types for libio in terms of the standard internal type names. */ - -#include -#define __need_size_t -#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T -# define __need_wchar_t -#endif -#define __need_NULL -#include - -#include -#include -#include - -#define _G_fpos_t __fpos_t -#define _G_fpos64_t __fpos64_t - -#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T -# include -#endif - -#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T -# include -typedef union -{ - struct __gconv_info __cd; - struct - { - struct __gconv_info __cd; - struct __gconv_step_data __data; - } __combined; -} _G_iconv_t; -#endif - - -/* These library features are always available in the GNU C library. */ -#define _G_va_list __gnuc_va_list - -#define _G_HAVE_MMAP 1 - -#define _G_IO_IO_FILE_VERSION 0x20001 - -/* This is defined by if `st_blksize' exists. */ -#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE) - -#define _G_BUFSIZ 8192 - -#endif /* bits/_G_config.h */ diff --git a/csu/init.c b/csu/init.c index 178063b44bf..c2f978f3da5 100644 --- a/csu/init.c +++ b/csu/init.c @@ -16,11 +16,8 @@ License along with the GNU C Library; if not, see . */ -#if defined __GNUC__ && __GNUC__ >= 2 - -#include - -/* This records which stdio is linked against in the application. */ -const int _IO_stdin_used = _G_IO_IO_FILE_VERSION; - -#endif +/* Vestigial libio version number. Some code in libio checks whether + this symbol exists in the executable, but nothing looks at its + value anymore; the value it was historically set to has been + preserved out of an abundance of caution. */ +const int _IO_stdin_used = 0x20001; diff --git a/include/stdio.h b/include/stdio.h index f12b281b4d6..94bc2fdc7ef 100644 --- a/include/stdio.h +++ b/include/stdio.h @@ -15,44 +15,44 @@ extern int __snprintf (char *__restrict __s, size_t __maxlen, __attribute__ ((__format__ (__printf__, 3, 4))); libc_hidden_proto (__snprintf) extern int __vsnprintf (char *__restrict __s, size_t __maxlen, - const char *__restrict __format, _G_va_list __arg) + const char *__restrict __format, __gnuc_va_list __arg) __attribute__ ((__format__ (__printf__, 3, 0))); extern int __vfscanf (FILE *__restrict __s, const char *__restrict __format, - _G_va_list __arg) + __gnuc_va_list __arg) __attribute__ ((__format__ (__scanf__, 2, 0))); libc_hidden_proto (__vfscanf) extern int __vscanf (const char *__restrict __format, - _G_va_list __arg) + __gnuc_va_list __arg) __attribute__ ((__format__ (__scanf__, 1, 0))); extern _IO_ssize_t __getline (char **__lineptr, size_t *__n, FILE *__stream) attribute_hidden; extern int __vsscanf (const char *__restrict __s, const char *__restrict __format, - _G_va_list __arg) + __gnuc_va_list __arg) __attribute__ ((__format__ (__scanf__, 2, 0))); extern int __sprintf_chk (char *, int, size_t, const char *, ...) __THROW; extern int __snprintf_chk (char *, size_t, int, size_t, const char *, ...) __THROW; extern int __vsprintf_chk (char *, int, size_t, const char *, - _G_va_list) __THROW; + __gnuc_va_list) __THROW; extern int __vsnprintf_chk (char *, size_t, int, size_t, const char *, - _G_va_list) __THROW; + __gnuc_va_list) __THROW; extern int __printf_chk (int, const char *, ...); extern int __fprintf_chk (FILE *, int, const char *, ...); -extern int __vprintf_chk (int, const char *, _G_va_list); -extern int __vfprintf_chk (FILE *, int, const char *, _G_va_list); +extern int __vprintf_chk (int, const char *, __gnuc_va_list); +extern int __vfprintf_chk (FILE *, int, const char *, __gnuc_va_list); extern char *__fgets_unlocked_chk (char *buf, size_t size, int n, FILE *fp); extern char *__fgets_chk (char *buf, size_t size, int n, FILE *fp); extern int __asprintf_chk (char **, int, const char *, ...) __THROW; -extern int __vasprintf_chk (char **, int, const char *, _G_va_list) __THROW; +extern int __vasprintf_chk (char **, int, const char *, __gnuc_va_list) __THROW; extern int __dprintf_chk (int, int, const char *, ...); -extern int __vdprintf_chk (int, int, const char *, _G_va_list); +extern int __vdprintf_chk (int, int, const char *, __gnuc_va_list); extern int __obstack_printf_chk (struct obstack *, int, const char *, ...) __THROW; extern int __obstack_vprintf_chk (struct obstack *, int, const char *, - _G_va_list) __THROW; + __gnuc_va_list) __THROW; extern int __isoc99_fscanf (FILE *__restrict __stream, const char *__restrict __format, ...) __wur; @@ -61,12 +61,12 @@ extern int __isoc99_sscanf (const char *__restrict __s, const char *__restrict __format, ...) __THROW; extern int __isoc99_vfscanf (FILE *__restrict __s, const char *__restrict __format, - _G_va_list __arg) __wur; + __gnuc_va_list __arg) __wur; extern int __isoc99_vscanf (const char *__restrict __format, - _G_va_list __arg) __wur; + __gnuc_va_list __arg) __wur; extern int __isoc99_vsscanf (const char *__restrict __s, const char *__restrict __format, - _G_va_list __arg) __THROW; + __gnuc_va_list __arg) __THROW; libc_hidden_proto (__isoc99_vsscanf) libc_hidden_proto (__isoc99_vfscanf) diff --git a/libio/filedoalloc.c b/libio/filedoalloc.c index 329843827f5..d6517e493b0 100644 --- a/libio/filedoalloc.c +++ b/libio/filedoalloc.c @@ -93,7 +93,7 @@ _IO_file_doallocate (_IO_FILE *fp) local_isatty (fp->_fileno)) fp->_flags |= _IO_LINE_BUF; } -#if _IO_HAVE_ST_BLKSIZE +#if defined _STATBUF_ST_BLKSIZE if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ) size = st.st_blksize; #endif diff --git a/libio/fileops.c b/libio/fileops.c index 6d5393cea3f..5fd8a9647f2 100644 --- a/libio/fileops.c +++ b/libio/fileops.c @@ -582,7 +582,7 @@ mmap_remap_check (_IO_FILE *fp) { /* The file added some pages. We need to remap it. */ void *p; -#ifdef _G_HAVE_MREMAP +#if _G_HAVE_MREMAP p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end - fp->_IO_buf_base), ROUNDED (st.st_size), MREMAP_MAYMOVE); diff --git a/libio/iofdopen.c b/libio/iofdopen.c index 3546d52b4da..b6f1500dee4 100644 --- a/libio/iofdopen.c +++ b/libio/iofdopen.c @@ -126,13 +126,13 @@ _IO_new_fdopen (int fd, const char *mode) new_f->fp.file._lock = &new_f->lock; #endif _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, -#ifdef _G_HAVE_MMAP +#if _G_HAVE_MMAP (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_wfile_jumps_maybe_mmap : #endif &_IO_wfile_jumps); _IO_JUMPS (&new_f->fp) = -#ifdef _G_HAVE_MMAP +#if _G_HAVE_MMAP (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap : #endif &_IO_file_jumps; diff --git a/libio/iofopen.c b/libio/iofopen.c index d6f59497b42..2ea82e20917 100644 --- a/libio/iofopen.c +++ b/libio/iofopen.c @@ -33,7 +33,7 @@ _IO_FILE * __fopen_maybe_mmap (_IO_FILE *fp) { -#ifdef _G_HAVE_MMAP +#if _G_HAVE_MMAP if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES)) { /* Since this is read-only, we might be able to mmap the contents diff --git a/libio/libio.h b/libio/libio.h index ff67e18c182..09531202472 100644 --- a/libio/libio.h +++ b/libio/libio.h @@ -41,8 +41,24 @@ # error "Someone forgot to include stdio-lock.h" #endif -#include -/* ALL of these should be defined in _G_config.h */ +#define __need_wchar_t +#include + +#include +#include +#include + +typedef union +{ + struct __gconv_info __cd; + struct + { + struct __gconv_info __cd; + struct __gconv_step_data __data; + } __combined; +} _IO_iconv_t; + +/* Map the names used in libio to the names used in libc generally. */ #define _IO_fpos_t __fpos_t #define _IO_fpos64_t __fpos64_t #define _IO_size_t size_t @@ -51,8 +67,6 @@ #define _IO_off64_t __off64_t #define _IO_pid_t __pid_t #define _IO_uid_t __uid_t -#define _IO_iconv_t _G_iconv_t -#define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE #define _IO_BUFSIZ BUFSIZ #define _IO_wint_t wint_t #define _IO_va_list __gnuc_va_list diff --git a/libio/libioP.h b/libio/libioP.h index 8edc207277e..58cc9de094b 100644 --- a/libio/libioP.h +++ b/libio/libioP.h @@ -46,6 +46,12 @@ #include #include "iolibio.h" +#include + +/* For historical reasons this is the name of the sysdeps header that + adjusts the libio configuration. */ +#include <_G_config.h> + #ifdef __cplusplus extern "C" { #endif @@ -75,16 +81,10 @@ extern "C" { * object being acted on (i.e. the 'this' parameter). */ -#include -#if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) - /* Setting this macro disables the use of the _vtable_offset bias in - _IO_JUMPS_FUNCS, below. That is only needed if we want to - support old binaries (see oldfileops.c). */ -# define _G_IO_NO_BACKWARD_COMPAT 1 -#endif - -#if (!defined _IO_USE_OLD_IO_FILE \ - && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0)) +/* Setting this macro to 1 enables the use of the _vtable_offset bias + in _IO_JUMPS_FUNCS, below. This is only needed for new-format + _IO_FILE in libc that must support old binaries (see oldfileops.c). */ +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) && !defined _IO_USE_OLD_IO_FILE # define _IO_JUMPS_OFFSET 1 #else # define _IO_JUMPS_OFFSET 0 diff --git a/sysdeps/generic/_G_config.h b/sysdeps/generic/_G_config.h new file mode 100644 index 00000000000..7c917bf64c4 --- /dev/null +++ b/sysdeps/generic/_G_config.h @@ -0,0 +1,15 @@ +/* Configuration parameters for stdio - generic version. */ + +#ifndef __G_CONFIG_H +#define __G_CONFIG_H 1 + +/* Define to 1 if the operating system supports mmap, 0 otherwise. + This function is required by POSIX but might still be unavailable, + for instance when the hardware lacks support for virtual memory. */ +#define _G_HAVE_MMAP 1 + +/* Define to 1 if the operating system supports mremap, 0 otherwise. + This function is currently a Linux-specific extension. */ +#define _G_HAVE_MREMAP 0 + +#endif /* _G_config.h */ diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-compat.h b/sysdeps/ieee754/ldbl-opt/nldbl-compat.h index 3b3ef731a6d..d61fbb2f649 100644 --- a/sysdeps/ieee754/ldbl-opt/nldbl-compat.h +++ b/sysdeps/ieee754/ldbl-opt/nldbl-compat.h @@ -82,22 +82,23 @@ extern ssize_t __nldbl___vstrfmon (char *, size_t, const char *, va_list) /* These don't use __typeof because they were not declared by the headers, since we don't compile with _FORTIFY_SOURCE. */ extern int __nldbl___vfprintf_chk (FILE *__restrict, int, - const char *__restrict, _G_va_list); + const char *__restrict, __gnuc_va_list); extern int __nldbl___vfwprintf_chk (FILE *__restrict, int, const wchar_t *__restrict, __gnuc_va_list); extern int __nldbl___vsprintf_chk (char *__restrict, int, size_t, - const char *__restrict, _G_va_list) __THROW; + const char *__restrict, __gnuc_va_list) + __THROW; extern int __nldbl___vsnprintf_chk (char *__restrict, size_t, int, size_t, - const char *__restrict, _G_va_list) + const char *__restrict, __gnuc_va_list) __THROW; extern int __nldbl___vswprintf_chk (wchar_t *__restrict, size_t, int, size_t, const wchar_t *__restrict, __gnuc_va_list) __THROW; -extern int __nldbl___vasprintf_chk (char **, int, const char *, _G_va_list) +extern int __nldbl___vasprintf_chk (char **, int, const char *, __gnuc_va_list) __THROW; -extern int __nldbl___vdprintf_chk (int, int, const char *, _G_va_list); +extern int __nldbl___vdprintf_chk (int, int, const char *, __gnuc_va_list); extern int __nldbl___obstack_vprintf_chk (struct obstack *, int, const char *, - _G_va_list) __THROW; + __gnuc_va_list) __THROW; extern void __nldbl___vsyslog_chk (int, int, const char *, va_list); diff --git a/sysdeps/unix/sysv/linux/_G_config.h b/sysdeps/unix/sysv/linux/_G_config.h new file mode 100644 index 00000000000..04137164816 --- /dev/null +++ b/sysdeps/unix/sysv/linux/_G_config.h @@ -0,0 +1,15 @@ +/* Configuration parameters for stdio - Linux version. */ + +#ifndef __G_CONFIG_H +#define __G_CONFIG_H 1 + +/* Define to 1 if the operating system supports mmap, 0 otherwise. + This function is required by POSIX but might still be unavailable, + for instance when the hardware lacks support for virtual memory. */ +#define _G_HAVE_MMAP 1 + +/* Define to 1 if the operating system supports mremap, 0 otherwise. + This function is currently a Linux-specific extension. */ +#define _G_HAVE_MREMAP 1 + +#endif /* bits/_G_config.h */ diff --git a/sysdeps/unix/sysv/linux/bits/_G_config.h b/sysdeps/unix/sysv/linux/bits/_G_config.h deleted file mode 100644 index 05a64acb2cf..00000000000 --- a/sysdeps/unix/sysv/linux/bits/_G_config.h +++ /dev/null @@ -1,55 +0,0 @@ -/* This file is needed by libio to define various configuration parameters. - These are always the same in the GNU C library. */ - -#ifndef _BITS_G_CONFIG_H -#define _BITS_G_CONFIG_H 1 - -/* Define types for libio in terms of the standard internal type names. */ - -#include -#define __need_size_t -#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T -# define __need_wchar_t -#endif -#define __need_NULL -#include - -#include -#include -#include - -#define _G_fpos_t __fpos_t -#define _G_fpos64_t __fpos64_t - -#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T -# include -#endif - -#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T -# include -typedef union -{ - struct __gconv_info __cd; - struct - { - struct __gconv_info __cd; - struct __gconv_step_data __data; - } __combined; -} _G_iconv_t; -#endif - - -/* These library features are always available in the GNU C library. */ -#define _G_va_list __gnuc_va_list - -#define _G_HAVE_MMAP 1 -#define _G_HAVE_MREMAP 1 - -#define _G_IO_IO_FILE_VERSION 0x20001 - -/* This is defined by if `st_blksize' exists. */ -#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE) - -#define _G_BUFSIZ 8192 - -#endif /* bits/_G_config.h */