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elf: Introduce to _dl_call_fini
This consolidates the destructor invocations from _dl_fini and dlclose. Remove the micro-optimization that avoids calling _dl_call_fini if they are no destructors (as dlclose is quite expensive anyway). The debug log message is now printed unconditionally. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
parent
eb8bf044bd
commit
b6c7135576
@ -53,6 +53,7 @@ routines = \
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# profiled libraries.
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dl-routines = \
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dl-call-libc-early-init \
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dl-call_fini \
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dl-close \
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dl-debug \
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dl-debug-symbols \
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50
elf/dl-call_fini.c
Normal file
50
elf/dl-call_fini.c
Normal file
@ -0,0 +1,50 @@
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/* Invoke DT_FINI and DT_FINI_ARRAY callbacks.
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Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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#include <sysdep.h>
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void
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_dl_call_fini (void *closure_map)
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{
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struct link_map *map = closure_map;
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/* When debugging print a message first. */
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if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
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_dl_debug_printf ("\ncalling fini: %s [%lu]\n\n", map->l_name, map->l_ns);
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/* Make sure nothing happens if we are called twice. */
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map->l_init_called = 0;
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ElfW(Dyn) *fini_array = map->l_info[DT_FINI_ARRAY];
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if (fini_array != NULL)
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{
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ElfW(Addr) *array = (ElfW(Addr) *) (map->l_addr
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+ fini_array->d_un.d_ptr);
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size_t sz = (map->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
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/ sizeof (ElfW(Addr)));
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while (sz-- > 0)
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((fini_t) array[sz]) ();
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}
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/* Next try the old-style destructor. */
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ElfW(Dyn) *fini = map->l_info[DT_FINI];
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if (fini != NULL)
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DL_CALL_DT_FINI (map, ((void *) map->l_addr + fini->d_un.d_ptr));
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}
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@ -36,11 +36,6 @@
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#include <dl-unmap-segments.h>
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/* Type of the constructor functions. */
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typedef void (*fini_t) (void);
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/* Special l_idx value used to indicate which objects remain loaded. */
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#define IDX_STILL_USED -1
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@ -110,31 +105,6 @@ remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp,
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return false;
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}
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/* Invoke dstructors for CLOSURE (a struct link_map *). Called with
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exception handling temporarily disabled, to make errors fatal. */
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static void
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call_destructors (void *closure)
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{
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struct link_map *map = closure;
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if (map->l_info[DT_FINI_ARRAY] != NULL)
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{
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ElfW(Addr) *array =
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(ElfW(Addr) *) (map->l_addr
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+ map->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
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unsigned int sz = (map->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
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/ sizeof (ElfW(Addr)));
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while (sz-- > 0)
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((fini_t) array[sz]) ();
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}
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/* Next try the old-style destructor. */
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if (map->l_info[DT_FINI] != NULL)
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DL_CALL_DT_FINI (map, ((void *) map->l_addr
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+ map->l_info[DT_FINI]->d_un.d_ptr));
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}
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void
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_dl_close_worker (struct link_map *map, bool force)
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{
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@ -280,17 +250,7 @@ _dl_close_worker (struct link_map *map, bool force)
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half-cooked objects. Temporarily disable exception
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handling, so that errors are fatal. */
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if (imap->l_init_called)
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{
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/* When debugging print a message first. */
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if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS,
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0))
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_dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
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imap->l_name, nsid);
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if (imap->l_info[DT_FINI_ARRAY] != NULL
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|| imap->l_info[DT_FINI] != NULL)
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_dl_catch_exception (NULL, call_destructors, imap);
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}
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_dl_catch_exception (NULL, _dl_call_fini, imap);
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#ifdef SHARED
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/* Auditing checkpoint: we remove an object. */
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@ -21,11 +21,6 @@
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#include <ldsodefs.h>
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#include <elf-initfini.h>
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/* Type of the constructor functions. */
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typedef void (*fini_t) (void);
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void
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_dl_fini (void)
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{
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@ -116,38 +111,7 @@ _dl_fini (void)
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if (l->l_init_called)
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{
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/* Make sure nothing happens if we are called twice. */
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l->l_init_called = 0;
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/* Is there a destructor function? */
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if (l->l_info[DT_FINI_ARRAY] != NULL
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|| (ELF_INITFINI && l->l_info[DT_FINI] != NULL))
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{
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/* When debugging print a message first. */
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if (__builtin_expect (GLRO(dl_debug_mask)
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& DL_DEBUG_IMPCALLS, 0))
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_dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
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DSO_FILENAME (l->l_name),
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ns);
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/* First see whether an array is given. */
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if (l->l_info[DT_FINI_ARRAY] != NULL)
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{
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ElfW(Addr) *array =
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(ElfW(Addr) *) (l->l_addr
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+ l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
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unsigned int i = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
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/ sizeof (ElfW(Addr)));
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while (i-- > 0)
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((fini_t) array[i]) ();
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}
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/* Next try the old-style destructor. */
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if (ELF_INITFINI && l->l_info[DT_FINI] != NULL)
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DL_CALL_DT_FINI
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(l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr);
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}
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_dl_call_fini (l);
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#ifdef SHARED
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/* Auditing checkpoint: another object closed. */
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_dl_audit_objclose (l);
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@ -105,6 +105,9 @@ typedef struct link_map *lookup_t;
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DT_PREINIT_ARRAY. */
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typedef void (*dl_init_t) (int, char **, char **);
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/* Type of a constructor function, in DT_FINI, DT_FINI_ARRAY. */
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typedef void (*fini_t) (void);
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/* On some architectures a pointer to a function is not just a pointer
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to the actual code of the function but rather an architecture
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specific descriptor. */
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@ -1048,6 +1051,11 @@ extern void _dl_init (struct link_map *main_map, int argc, char **argv,
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initializer functions have completed. */
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extern void _dl_fini (void) attribute_hidden;
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/* Invoke the DT_FINI_ARRAY and DT_FINI destructors for MAP, which
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must be a struct link_map *. Can be used as an argument to
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_dl_catch_exception. */
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void _dl_call_fini (void *map) attribute_hidden;
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/* Sort array MAPS according to dependencies of the contained objects.
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If FORCE_FIRST, MAPS[0] keeps its place even if the dependencies
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say otherwise. */
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