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Mark internal functions with attribute_hidden [BZ #18822]
Mark internal functions with attribute_hidden to allow direct access to
internal functions within libc.so and libc.a without using GOT nor PLT.
Size comparison of libc.so:
On x86-64:
text data bss dec hex
Before: 1728577 20584 17088 1766249 1af369
After : 1728593 20584 17088 1766265 1af379
The only change is __gconv_release_shlib in iconv/gconv_dl.c is inlined
since it is hidden, which increases the code size of gconv_dl.os by 18
bytes.
On i686:
text data bss dec hex
Before: 1869039 11444 11112 1891595 1cdd0b
After : 1868635 11444 11112 1891191 1cdb77
The code size is decreased by avoiding GOT/PLT for hidden functions.
[BZ #18822]
* iconv/gconv_int.h (__gconv_open): Add attribute_hidden.
(__gconv_close): Likewise.
(__gconv): Likewise.
(__gconv_find_transform): Likewise.
(__gconv_lookup_cache): Likewise.
(__gconv_compare_alias_cache): Likewise.
(__gconv_load_cache): Likewise.
(__gconv_get_path): Likewise.
(__gconv_close_transform): Likewise.
(__gconv_release_cache): Likewise.
(__gconv_find_shlib): Likewise.
(__gconv_release_shlib): Likewise.
(__gconv_get_builtin_trans): Likewise.
(__gconv_compare_alias): Likewise.
* include/dlfcn.h (_dlerror_run): Likewise.
* include/stdio.h (__fortify_fail_abort): Likewise.
* include/time.h (__tz_compute): Likewise.
(__strptime_internal): Likewise.
* intl/gettextP.h (_nl_find_domain): Likewise.
(_nl_load_domain): Likewise.
(_nl_find_msg): Likewise.
* intl/plural-exp.h (FREE_EXPRESSION): Likewise.
(EXTRACT_PLURAL_EXPRESSION): Likewise.
* locale/coll-lookup.h (__collidx_table_lookup): Likewise.
* resolv/gai_misc.h (__gai_enqueue_request): Likewise.
(__gai_find_request): Likewise.
(__gai_remove_request): Likewise.
(__gai_notify): Likewise.
(__gai_notify_only): Likewise.
* sysdeps/generic/aio_misc.h (__aio_sigqueue): Likewise.
* sysdeps/generic/ldsodefs.h (_dl_fini): Likewise.
(_dl_non_dynamic_init): Likewise.
(_dl_aux_init): Likewise.
* sysdeps/i386/machine-gmon.h (mcount_internal): Likewise.
* sysdeps/unix/sysv/linux/i386/olddirent.h (__old_getdents64):
Likewise.
* wcsmbs/wcsmbsload.h (__wcsmbs_load_conv): Likewise.
(__wcsmbs_clone_conv): Likewise.
(__wcsmbs_named_conv): Likewise.
This commit is contained in:
H.J. Lu
parent
8ed3b64330
commit
8bcdb7e0c5
43
ChangeLog
43
ChangeLog
@ -1,3 +1,46 @@
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2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #18822]
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* iconv/gconv_int.h (__gconv_open): Add attribute_hidden.
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(__gconv_close): Likewise.
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(__gconv): Likewise.
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(__gconv_find_transform): Likewise.
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(__gconv_lookup_cache): Likewise.
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(__gconv_compare_alias_cache): Likewise.
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(__gconv_load_cache): Likewise.
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(__gconv_get_path): Likewise.
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(__gconv_close_transform): Likewise.
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(__gconv_release_cache): Likewise.
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(__gconv_find_shlib): Likewise.
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(__gconv_release_shlib): Likewise.
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(__gconv_get_builtin_trans): Likewise.
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(__gconv_compare_alias): Likewise.
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* include/dlfcn.h (_dlerror_run): Likewise.
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* include/stdio.h (__fortify_fail_abort): Likewise.
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* include/time.h (__tz_compute): Likewise.
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(__strptime_internal): Likewise.
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* intl/gettextP.h (_nl_find_domain): Likewise.
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(_nl_load_domain): Likewise.
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(_nl_find_msg): Likewise.
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* intl/plural-exp.h (FREE_EXPRESSION): Likewise.
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(EXTRACT_PLURAL_EXPRESSION): Likewise.
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* locale/coll-lookup.h (__collidx_table_lookup): Likewise.
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* resolv/gai_misc.h (__gai_enqueue_request): Likewise.
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(__gai_find_request): Likewise.
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(__gai_remove_request): Likewise.
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(__gai_notify): Likewise.
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(__gai_notify_only): Likewise.
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* sysdeps/generic/aio_misc.h (__aio_sigqueue): Likewise.
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* sysdeps/generic/ldsodefs.h (_dl_fini): Likewise.
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(_dl_non_dynamic_init): Likewise.
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(_dl_aux_init): Likewise.
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* sysdeps/i386/machine-gmon.h (mcount_internal): Likewise.
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* sysdeps/unix/sysv/linux/i386/olddirent.h (__old_getdents64):
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Likewise.
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* wcsmbs/wcsmbsload.h (__wcsmbs_load_conv): Likewise.
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(__wcsmbs_clone_conv): Likewise.
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(__wcsmbs_named_conv): Likewise.
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2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #18822]
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@ -156,10 +156,12 @@ __libc_lock_define (extern, __gconv_lock attribute_hidden)
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/* Return in *HANDLE decriptor for transformation from FROMSET to TOSET. */
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extern int __gconv_open (const char *toset, const char *fromset,
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__gconv_t *handle, int flags);
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__gconv_t *handle, int flags)
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attribute_hidden;
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/* Free resources associated with transformation descriptor CD. */
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extern int __gconv_close (__gconv_t cd);
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extern int __gconv_close (__gconv_t cd)
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attribute_hidden;
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/* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
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according to rules described by CD and place up to *OUTBYTESLEFT
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@ -167,33 +169,38 @@ extern int __gconv_close (__gconv_t cd);
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conversions in *IRREVERSIBLE if this pointer is not null. */
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extern int __gconv (__gconv_t cd, const unsigned char **inbuf,
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const unsigned char *inbufend, unsigned char **outbuf,
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unsigned char *outbufend, size_t *irreversible);
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unsigned char *outbufend, size_t *irreversible)
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attribute_hidden;
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/* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
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the single steps necessary for transformation from FROMSET to TOSET. */
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extern int __gconv_find_transform (const char *toset, const char *fromset,
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struct __gconv_step **handle,
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size_t *nsteps, int flags);
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size_t *nsteps, int flags)
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attribute_hidden;
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/* Search for transformation in cache data. */
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extern int __gconv_lookup_cache (const char *toset, const char *fromset,
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struct __gconv_step **handle, size_t *nsteps,
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int flags);
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int flags)
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attribute_hidden;
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/* Compare the two name for whether they are after alias expansion the
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same. This function uses the cache and fails if none is
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loaded. */
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extern int __gconv_compare_alias_cache (const char *name1, const char *name2,
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int *result);
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int *result)
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attribute_hidden;
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/* Free data associated with a step's structure. */
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extern void __gconv_release_step (struct __gconv_step *step);
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extern void __gconv_release_step (struct __gconv_step *step)
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attribute_hidden;
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/* Read all the configuration data and cache it. */
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extern void __gconv_read_conf (void) attribute_hidden;
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/* Try to read module cache file. */
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extern int __gconv_load_cache (void);
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extern int __gconv_load_cache (void) attribute_hidden;
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/* Retrieve pointer to internal cache. */
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extern void *__gconv_get_cache (void);
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@ -205,7 +212,7 @@ extern struct gconv_module *__gconv_get_modules_db (void);
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extern void *__gconv_get_alias_db (void);
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/* Determine the directories we are looking in. */
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extern void __gconv_get_path (void);
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extern void __gconv_get_path (void) attribute_hidden;
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/* Comparison function to search alias. */
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extern int __gconv_alias_compare (const void *p1, const void *p2)
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@ -214,28 +221,34 @@ extern int __gconv_alias_compare (const void *p1, const void *p2)
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/* Clear reference to transformation step implementations which might
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cause the code to be unloaded. */
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extern int __gconv_close_transform (struct __gconv_step *steps,
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size_t nsteps);
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size_t nsteps)
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attribute_hidden;
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/* Free all resources allocated for the transformation record when
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using the cache. */
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extern void __gconv_release_cache (struct __gconv_step *steps, size_t nsteps);
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extern void __gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
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attribute_hidden;
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/* Load shared object named by NAME. If already loaded increment reference
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count. */
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extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name);
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extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name)
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attribute_hidden;
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/* Release shared object. If no further reference is available unload
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the object. */
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extern void __gconv_release_shlib (struct __gconv_loaded_object *handle);
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extern void __gconv_release_shlib (struct __gconv_loaded_object *handle)
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attribute_hidden;
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/* Fill STEP with information about builtin module with NAME. */
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extern void __gconv_get_builtin_trans (const char *name,
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struct __gconv_step *step);
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struct __gconv_step *step)
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attribute_hidden;
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libc_hidden_proto (__gconv_transliterate)
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/* If NAME is an codeset alias expand it. */
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extern int __gconv_compare_alias (const char *name1, const char *name2);
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extern int __gconv_compare_alias (const char *name1, const char *name2)
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attribute_hidden;
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/* Builtin transformations. */
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@ -72,7 +72,8 @@ extern void *_dl_vsym (void *handle, const char *name, const char *version,
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_dl_catch_error. Returns zero for success, nonzero for failure; and
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arranges for `dlerror' to return the error details.
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ARGS is passed as argument to OPERATE. */
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extern int _dlerror_run (void (*operate) (void *), void *args);
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extern int _dlerror_run (void (*operate) (void *), void *args)
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attribute_hidden;
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#ifdef SHARED
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# define DL_CALLER_DECL /* Nothing */
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@ -100,7 +100,7 @@ extern void __libc_message (enum __libc_message_action action,
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const char *__fnt, ...);
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extern void __fortify_fail (const char *msg) __attribute__ ((__noreturn__));
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extern void __fortify_fail_abort (_Bool, const char *msg)
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__attribute__ ((__noreturn__));
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__attribute__ ((__noreturn__)) attribute_hidden;
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libc_hidden_proto (__fortify_fail)
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libc_hidden_proto (__fortify_fail_abort)
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@ -46,7 +46,7 @@ extern void __tzfile_default (const char *std, const char *dst,
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long int stdoff, long int dstoff);
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extern void __tzset_parse_tz (const char *tz);
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extern void __tz_compute (time_t timer, struct tm *tm, int use_localtime)
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__THROW;
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__THROW attribute_hidden;
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/* Subroutine of `mktime'. Return the `time_t' representation of TP and
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normalize TP, given that a `struct tm *' maps to a `time_t' as performed
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@ -89,7 +89,7 @@ extern int __getclktck (void);
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/* strptime support. */
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extern char * __strptime_internal (const char *rp, const char *fmt,
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struct tm *tm, void *statep,
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locale_t locparam);
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locale_t locparam) attribute_hidden;
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extern double __difftime (time_t time1, time_t time0);
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@ -251,19 +251,23 @@ extern const char *_nl_locale_name_default (void);
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struct loaded_l10nfile *_nl_find_domain (const char *__dirname, char *__locale,
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const char *__domainname,
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struct binding *__domainbinding);
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struct binding *__domainbinding)
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attribute_hidden;
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void _nl_load_domain (struct loaded_l10nfile *__domain,
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struct binding *__domainbinding);
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struct binding *__domainbinding)
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attribute_hidden;
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#ifdef IN_LIBGLOCALE
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char *_nl_find_msg (struct loaded_l10nfile *domain_file,
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struct binding *domainbinding, const char *encoding,
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const char *msgid,
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size_t *lengthp);
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size_t *lengthp)
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attribute_hidden;
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#else
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char *_nl_find_msg (struct loaded_l10nfile *domain_file,
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struct binding *domainbinding, const char *msgid,
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int convert, size_t *lengthp);
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int convert, size_t *lengthp)
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attribute_hidden;
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#endif
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/* The internal variables in the standalone libintl.a must have different
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@ -101,12 +101,13 @@ struct parse_args
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# define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
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#endif
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extern void FREE_EXPRESSION (struct expression *exp);
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extern void FREE_EXPRESSION (struct expression *exp) attribute_hidden;
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extern int PLURAL_PARSE (struct parse_args *arg);
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extern const struct expression GERMANIC_PLURAL attribute_hidden;
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extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
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const struct expression **pluralp,
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unsigned long int *npluralsp);
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unsigned long int *npluralsp)
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attribute_hidden;
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#if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
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extern unsigned long int plural_eval (const struct expression *pexp,
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@ -19,7 +19,9 @@
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#include <stdint.h>
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/* Lookup in a table of int32_t, with default value 0. */
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extern int32_t __collidx_table_lookup (const char *table, uint32_t wc);
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extern int32_t __collidx_table_lookup (const char *table, uint32_t wc)
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attribute_hidden;
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/* Lookup in a table of uint32_t, with default value 0xffffffff. */
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extern uint32_t __collseq_table_lookup (const char *table, uint32_t wc);
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extern uint32_t __collseq_table_lookup (const char *table, uint32_t wc)
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attribute_hidden;
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@ -75,19 +75,24 @@ extern pthread_mutex_t __gai_requests_mutex;
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/* Enqueue request. */
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extern struct requestlist *__gai_enqueue_request (struct gaicb *gaicbp);
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extern struct requestlist *__gai_enqueue_request (struct gaicb *gaicbp)
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attribute_hidden;
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/* Find request on wait list. */
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extern struct requestlist *__gai_find_request (const struct gaicb *gaicbp);
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extern struct requestlist *__gai_find_request (const struct gaicb *gaicbp)
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attribute_hidden;
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/* Remove request from waitlist. */
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extern int __gai_remove_request (struct gaicb *gaicbp);
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extern int __gai_remove_request (struct gaicb *gaicbp)
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attribute_hidden;
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/* Notify initiator of request and tell this everybody listening. */
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extern void __gai_notify (struct requestlist *req);
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extern void __gai_notify (struct requestlist *req)
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attribute_hidden;
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/* Notify initiator of request. */
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extern int __gai_notify_only (struct sigevent *sigev, pid_t caller_pid);
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extern int __gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
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attribute_hidden;
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/* Send the signal. */
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extern int __gai_sigqueue (int sig, const union sigval val, pid_t caller_pid);
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@ -40,7 +40,8 @@ typedef union
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/* Send the signal. */
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extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid);
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extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
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attribute_hidden;
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#endif /* aio_misc.h */
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@ -954,7 +954,7 @@ extern void _dl_init (struct link_map *main_map, int argc, char **argv,
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/* Call the finalizer functions of all shared objects whose
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initializer functions have completed. */
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extern void _dl_fini (void);
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extern void _dl_fini (void) attribute_hidden;
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/* Sort array MAPS according to dependencies of the contained objects. */
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extern void _dl_sort_fini (struct link_map **maps, size_t nmaps, char *used,
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@ -1123,10 +1123,12 @@ extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr);
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rtld_hidden_proto (_dl_find_dso_for_object)
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/* Initialization which is normally done by the dynamic linker. */
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extern void _dl_non_dynamic_init (void);
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extern void _dl_non_dynamic_init (void)
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attribute_hidden;
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/* Used by static binaries to check the auxiliary vector. */
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extern void _dl_aux_init (ElfW(auxv_t) *av);
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extern void _dl_aux_init (ElfW(auxv_t) *av)
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attribute_hidden;
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__END_DECLS
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@ -30,7 +30,7 @@
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#define mcount_internal __mcount_internal
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extern void mcount_internal (u_long frompc, u_long selfpc)
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__attribute__ ((regparm (2)));
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__attribute__ ((regparm (2))) attribute_hidden;
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#define _MCOUNT_DECL(frompc, selfpc) \
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__attribute__ ((regparm (2))) \
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@ -34,7 +34,8 @@ extern struct __old_dirent64 *__old_readdir64 (DIR *__dirp);
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libc_hidden_proto (__old_readdir64);
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extern int __old_readdir64_r (DIR *__dirp, struct __old_dirent64 *__entry,
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struct __old_dirent64 **__result);
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extern __ssize_t __old_getdents64 (int __fd, char *__buf, size_t __nbytes);
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extern __ssize_t __old_getdents64 (int __fd, char *__buf, size_t __nbytes)
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attribute_hidden;
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int __old_scandir64 (const char * __dir,
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struct __old_dirent64 *** __namelist,
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int (*__selector) (const struct __old_dirent64 *),
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@ -37,13 +37,16 @@ struct gconv_fcts
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extern const struct gconv_fcts __wcsmbs_gconv_fcts_c attribute_hidden;
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/* Load conversion functions for the currently selected locale. */
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extern void __wcsmbs_load_conv (struct __locale_data *new_category);
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extern void __wcsmbs_load_conv (struct __locale_data *new_category)
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attribute_hidden;
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/* Clone the current `__wcsmbs_load_conv' value. */
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extern void __wcsmbs_clone_conv (struct gconv_fcts *copy);
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extern void __wcsmbs_clone_conv (struct gconv_fcts *copy)
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attribute_hidden;
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/* Find the conversion functions for converting to and from NAME. */
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extern int __wcsmbs_named_conv (struct gconv_fcts *copy, const char *name);
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extern int __wcsmbs_named_conv (struct gconv_fcts *copy, const char *name)
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attribute_hidden;
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/* Function used for the `private.cleanup' hook. */
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extern void _nl_cleanup_ctype (struct __locale_data *) attribute_hidden;
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