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author | Ulrich Drepper <drepper@redhat.com> | 2004-09-18 06:46:52 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2004-09-18 06:46:52 +0000 |
commit | 7a11603dc6bde67066ce6f8d4c5f6b86bebaf3c1 (patch) | |
tree | 310fc0913c5e35b0a6e05bfab4423e38012e6ecf /elf/rtld.c | |
parent | f04b1e1f0f86cce932ede5b5a088c0ec4712ce34 (diff) | |
download | glibc-7a11603dc6bde67066ce6f8d4c5f6b86bebaf3c1.zip glibc-7a11603dc6bde67066ce6f8d4c5f6b86bebaf3c1.tar.gz glibc-7a11603dc6bde67066ce6f8d4c5f6b86bebaf3c1.tar.bz2 |
Update.
2004-09-17 Ulrich Drepper <drepper@redhat.com>
* include/link.h (struct link_map): Add l_used element.
* sysdeps/generic/ldsodefs.h: Define DL_DEBUG_UNUSED.
* elf/rtld.c (process_dl_debug): Recognize unused.
(dl_main): When unused debug flag is set check for unused direct
dependencies.
When printing dependencies and SONAME starts with /, omit the SONAME =>
part.
* elf/dl-lookup.c (_dl_lookup_symbol_x): Mark object in which the
symbol has been found as used.
* elf/ldd.bash.in: Add -u option.
Diffstat (limited to 'elf/rtld.c')
-rw-r--r-- | elf/rtld.c | 44 |
1 files changed, 44 insertions, 0 deletions
@@ -1526,6 +1526,44 @@ cannot allocate TLS data structures for initial thread"); _dl_printf ("\n"); } } + else if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) + { + /* Look through the dependencies of the main executable + and determine which of them is not actually + required. */ + struct link_map *l = GL(dl_loaded); + + /* Relocate the main executable. */ + struct relocate_args args = { .l = l, .lazy = GLRO(dl_lazy) }; + _dl_receive_error (print_unresolved, relocate_doit, &args); + + /* This loop depends on the dependencies of the executable to + correspond in number and order to the DT_NEEDED entries. */ + ElfW(Dyn) *dyn = GL(dl_loaded)->l_ld; + bool first = true; + while (dyn->d_tag != DT_NULL) + { + if (dyn->d_tag == DT_NEEDED) + { + l = l->l_next; + + if (!l->l_used) + { + if (first) + { + _dl_printf ("Unused direct dependencies:\n"); + first = false; + } + + _dl_printf ("\t%s\n", l->l_name); + } + } + + ++dyn; + } + + _exit (first != true); + } else if (! GL(dl_loaded)->l_info[DT_NEEDED]) _dl_printf ("\tstatically linked\n"); else @@ -1534,6 +1572,10 @@ cannot allocate TLS data structures for initial thread"); if (l->l_faked) /* The library was not found. */ _dl_printf ("\t%s => not found\n", l->l_libname->name); + else if (l->l_libname->name[0] == '/') + _dl_printf ("\t%s (0x%0*Zx)\n", l->l_libname->name, + (int) sizeof l->l_map_start * 2, + (size_t) l->l_map_start); else _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, l->l_name, (int) sizeof l->l_map_start * 2, @@ -1962,6 +2004,8 @@ process_dl_debug (const char *dl_debug) | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, { LEN_AND_STR ("statistics"), "display relocation statistics", DL_DEBUG_STATISTICS }, + { LEN_AND_STR ("unused"), "determined unused DSOs", + DL_DEBUG_UNUSED }, { LEN_AND_STR ("help"), "display this help message and exit", DL_DEBUG_HELP }, }; |