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Re: PATCH: PR ld/12975: --gc-sections doesn't remove symbols hidden with version scripts
On Wed, Sep 14, 2011 at 5:30 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Wed, Sep 14, 2011 at 5:07 PM, Alan Modra <amodra@gmail.com> wrote:
>> On Wed, Sep 14, 2011 at 02:32:45PM -0700, H.J. Lu wrote:
>>> @@ -11907,14 +11909,24 @@ bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
>>> ?{
>>> ? ?struct bfd_link_info *info = (struct bfd_link_info *) inf;
>>>
>>> - ?if ((h->root.type == bfd_link_hash_defined
>>> - ? ? ? || h->root.type == bfd_link_hash_defweak)
>>> - ? ? ?&& (h->ref_dynamic
>>> - ? ? ? || (!info->executable
>>> - ? ? ? ? ? && h->def_regular
>>> - ? ? ? ? ? && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
>>> - ? ? ? ? ? && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
>>> - ? ?h->root.u.def.section->flags |= SEC_KEEP;
>>> + ?if (h->root.type == bfd_link_hash_defined
>>> + ? ? ?|| h->root.type == bfd_link_hash_defweak)
>>> + ? ?{
>>> + ? ? ?if (h->ref_dynamic)
>>> + ? ? h->root.u.def.section->flags |= SEC_KEEP;
>>> + ? ? ?else if (!info->executable
>>> + ? ? ? ? ? ?&& h->def_regular
>>> + ? ? ? ? ? ?&& ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
>>> + ? ? ? ? ? ?&& ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)
>>> + ? ? {
>>> + ? ? ? bfd_boolean hide;
>>> + ? ? ? if (info->version_info == NULL
>>> + ? ? ? ? ? || (bfd_find_version_for_sym (info->version_info,
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? h->root.root.string, &hide)
>>> + ? ? ? ? ? ? ? && !hide))
>>
>> Is this correct? ?Seems to me this should be
>> ? ? ? ? ?if (info->version_info == NULL
>> ? ? ? ? ? ? ?|| !bfd_find_version_for_sym (info->version_info,
>> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?h->root.root.string, &hide)
>> ? ? ? ? ? ? ?|| !hide)
>>
>>> + ? ? ? ? h->root.u.def.section->flags |= SEC_KEEP;
>>> + ? ? }
>>> + ? ?}
>>>
>>> ? ?return TRUE;
>>> ?}
>>
>
> I copied it from _bfd_elf_export_symbol. ?Should it be also
> changed?
>
I added bfd_hide_sym_by_version and also use it to check if
a LTO symbol is hidden by version script. OK to install?
Thanks.
--
H.J.
---
bfd/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* bfd-in.h (bfd_elf_size_dynamic_sections): Remove pointer
to struct bfd_elf_version_tree.
* bfd-in2.h: Regenerated.
* elflink.c (elf_info_failed): Remove verdefs.
(_bfd_elf_export_symbol): Updated.
_bfd_elf_link_assign_sym_version): Likewise.
(bfd_elf_size_dynamic_sections): Remove pointer to struct
bfd_elf_version_tree. Updated.
(bfd_elf_gc_mark_dynamic_ref_symbol): Check if a symbol is hidden
by linker script.
* linker.c (bfd_hide_sym_by_version): New.
include/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* bfdlink.h (bfd_link_info): Add version_info.
ld/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* ldlang.c (lang_elf_version_info): Removed.
(lang_register_vers_node): Replace lang_elf_version_info with
link_info.version_info.
(lang_add_vers_depend): Likewise.
* pe-dll.c (process_def_file_and_drectve): Likewise.
* emultempl/solaris2.em (elf_solaris2_before_allocation): Likewise.
* ldlang.h (lang_elf_version_info): Removed.
* plugin.c (is_visible_from_outside): Check if symbol is hidden
by version script.
* emultempl/elf32.em (gld${EMULATION_NAME}_before_allocation):
Remove lang_elf_version_info.
ld/testsuite/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* ld-elf/pr12975.d: New.
* ld-elf/pr12975.s: Likewise.
* ld-elf/pr12975.t: Likewise.
bfd/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* bfd-in.h (bfd_elf_size_dynamic_sections): Remove pointer
to struct bfd_elf_version_tree.
* bfd-in2.h: Regenerated.
* elflink.c (elf_info_failed): Remove verdefs.
(_bfd_elf_export_symbol): Updated.
_bfd_elf_link_assign_sym_version): Likewise.
(bfd_elf_size_dynamic_sections): Remove pointer to struct
bfd_elf_version_tree. Updated.
(bfd_elf_gc_mark_dynamic_ref_symbol): Check if a symbol is hidden
by linker script.
* linker.c (bfd_hide_sym_by_version): New.
include/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* bfdlink.h (bfd_link_info): Add version_info.
ld/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* ldlang.c (lang_elf_version_info): Removed.
(lang_register_vers_node): Replace lang_elf_version_info with
link_info.version_info.
(lang_add_vers_depend): Likewise.
* pe-dll.c (process_def_file_and_drectve): Likewise.
* emultempl/solaris2.em (elf_solaris2_before_allocation): Likewise.
* ldlang.h (lang_elf_version_info): Removed.
* plugin.c (is_visible_from_outside): Check if symbol is hidden
by version script.
* emultempl/elf32.em (gld${EMULATION_NAME}_before_allocation):
Remove lang_elf_version_info.
ld/testsuite/
2011-09-15 H.J. Lu <hongjiu.lu@intel.com>
PR ld/12975
* ld-elf/pr12975.d: New.
* ld-elf/pr12975.s: Likewise.
* ld-elf/pr12975.t: Likewise.
diff --git a/bfd/bfd-in.h b/bfd/bfd-in.h
index 718d72e..a477b49 100644
--- a/bfd/bfd-in.h
+++ b/bfd/bfd-in.h
@@ -645,8 +645,7 @@ extern bfd_boolean bfd_elf_get_bfd_needed_list
(bfd *, struct bfd_link_needed_list **);
extern bfd_boolean bfd_elf_size_dynamic_sections
(bfd *, const char *, const char *, const char *, const char *, const char *,
- const char * const *, struct bfd_link_info *, struct bfd_section **,
- struct bfd_elf_version_tree *);
+ const char * const *, struct bfd_link_info *, struct bfd_section **);
extern bfd_boolean bfd_elf_size_dynsym_hash_dynstr
(bfd *, struct bfd_link_info *);
extern void bfd_elf_set_dt_needed_name
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 7cf3b7e..22fcdf6 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -652,8 +652,7 @@ extern bfd_boolean bfd_elf_get_bfd_needed_list
(bfd *, struct bfd_link_needed_list **);
extern bfd_boolean bfd_elf_size_dynamic_sections
(bfd *, const char *, const char *, const char *, const char *, const char *,
- const char * const *, struct bfd_link_info *, struct bfd_section **,
- struct bfd_elf_version_tree *);
+ const char * const *, struct bfd_link_info *, struct bfd_section **);
extern bfd_boolean bfd_elf_size_dynsym_hash_dynstr
(bfd *, struct bfd_link_info *);
extern void bfd_elf_set_dt_needed_name
@@ -6199,6 +6198,9 @@ struct bfd_elf_version_tree * bfd_find_version_for_sym
(struct bfd_elf_version_tree *verdefs,
const char *sym_name, bfd_boolean *hide);
+bfd_boolean bfd_hide_sym_by_version
+ (struct bfd_elf_version_tree *verdefs, const char *sym_name);
+
/* Extracted from simple.c. */
bfd_byte *bfd_simple_get_relocated_section_contents
(bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table);
diff --git a/bfd/elflink.c b/bfd/elflink.c
index 528f705..2560104 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -36,7 +36,6 @@
struct elf_info_failed
{
struct bfd_link_info *info;
- struct bfd_elf_version_tree *verdefs;
bfd_boolean failed;
};
@@ -1820,20 +1819,14 @@ _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
return TRUE;
if (h->dynindx == -1
- && (h->def_regular
- || h->ref_regular))
+ && (h->def_regular || h->ref_regular)
+ && ! bfd_hide_sym_by_version (eif->info->version_info,
+ h->root.root.string))
{
- bfd_boolean hide;
-
- if (eif->verdefs == NULL
- || (bfd_find_version_for_sym (eif->verdefs, h->root.root.string, &hide)
- && !hide))
+ if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
{
- if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
- {
- eif->failed = TRUE;
- return FALSE;
- }
+ eif->failed = TRUE;
+ return FALSE;
}
}
@@ -1981,7 +1974,7 @@ _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
}
/* Look for the version. If we find it, it is no longer weak. */
- for (t = sinfo->verdefs; t != NULL; t = t->next)
+ for (t = sinfo->info->version_info; t != NULL; t = t->next)
{
if (strcmp (t->name, p) == 0)
{
@@ -2050,9 +2043,12 @@ _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
version_index = 1;
/* Don't count anonymous version tag. */
- if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
+ if (sinfo->info->version_info != NULL
+ && sinfo->info->version_info->vernum == 0)
version_index = 0;
- for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
+ for (pp = &sinfo->info->version_info;
+ *pp != NULL;
+ pp = &(*pp)->next)
++version_index;
t->vernum = version_index;
@@ -2078,12 +2074,13 @@ _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
/* If we don't have a version for this symbol, see if we can find
something. */
- if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
+ if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
{
bfd_boolean hide;
- h->verinfo.vertree = bfd_find_version_for_sym (sinfo->verdefs,
- h->root.root.string, &hide);
+ h->verinfo.vertree
+ = bfd_find_version_for_sym (sinfo->info->version_info,
+ h->root.root.string, &hide);
if (h->verinfo.vertree != NULL && hide)
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
}
@@ -5493,8 +5490,7 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
const char *depaudit,
const char * const *auxiliary_filters,
struct bfd_link_info *info,
- asection **sinterpptr,
- struct bfd_elf_version_tree *verdefs)
+ asection **sinterpptr)
{
bfd_size_type soname_indx;
bfd *dynobj;
@@ -5671,7 +5667,6 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
}
eif.info = info;
- eif.verdefs = verdefs;
eif.failed = FALSE;
/* If we are supposed to export all symbols into the dynamic symbol
@@ -5687,7 +5682,7 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
}
/* Make all global versions with definition. */
- for (t = verdefs; t != NULL; t = t->next)
+ for (t = info->version_info; t != NULL; t = t->next)
for (d = t->globals.list; d != NULL; d = d->next)
if (!d->symver && d->literal)
{
@@ -5740,7 +5735,6 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
/* Attach all the symbols to their version information. */
asvinfo.info = info;
- asvinfo.verdefs = verdefs;
asvinfo.failed = FALSE;
elf_link_hash_traverse (elf_hash_table (info),
@@ -5753,7 +5747,7 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
{
/* Check if all global versions have a definition. */
all_defined = TRUE;
- for (t = verdefs; t != NULL; t = t->next)
+ for (t = info->version_info; t != NULL; t = t->next)
for (d = t->globals.list; d != NULL; d = d->next)
if (d->literal && !d->symver && !d->script)
{
@@ -5886,6 +5880,7 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
if (elf_hash_table (info)->dynamic_sections_created)
{
unsigned long section_sym_count;
+ struct bfd_elf_version_tree *verdefs;
asection *s;
/* Set up the version definition section. */
@@ -5894,7 +5889,7 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
/* We may have created additional version definitions if we are
just linking a regular application. */
- verdefs = asvinfo.verdefs;
+ verdefs = info->version_info;
/* Skip anonymous version tag. */
if (verdefs != NULL && verdefs->vernum == 0)
@@ -11913,7 +11908,9 @@ bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
|| (!info->executable
&& h->def_regular
&& ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
- && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
+ && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
+ && !bfd_hide_sym_by_version (info->version_info,
+ h->root.root.string))))
h->root.u.def.section->flags |= SEC_KEEP;
return TRUE;
diff --git a/bfd/linker.c b/bfd/linker.c
index e443862..7a01e11 100644
--- a/bfd/linker.c
+++ b/bfd/linker.c
@@ -3380,3 +3380,26 @@ bfd_find_version_for_sym (struct bfd_elf_version_tree *verdefs,
return NULL;
}
+
+/*
+FUNCTION
+ bfd_hide_sym_by_version
+
+SYNOPSIS
+ bfd_boolean bfd_hide_sym_by_version
+ (struct bfd_elf_version_tree *verdefs, const char *sym_name);
+
+DESCRIPTION
+ Search an elf version script tree for symbol versioning
+ info for a given symbol. Return TRUE if the symbol is hidden.
+
+*/
+
+bfd_boolean
+bfd_hide_sym_by_version (struct bfd_elf_version_tree *verdefs,
+ const char *sym_name)
+{
+ bfd_boolean hidden = FALSE;
+ bfd_find_version_for_sym (verdefs, sym_name, &hidden);
+ return hidden;
+}
diff --git a/include/bfdlink.h b/include/bfdlink.h
index 71b1e25..c9e127c 100644
--- a/include/bfdlink.h
+++ b/include/bfdlink.h
@@ -245,6 +245,7 @@ struct flag_info
};
struct bfd_elf_dynamic_list;
+struct bfd_elf_version_tree;
/* This structure holds all the information needed to communicate
between BFD and the linker when doing a link. */
@@ -496,6 +497,9 @@ struct bfd_link_info
/* List of symbols should be dynamic. */
struct bfd_elf_dynamic_list *dynamic_list;
+
+ /* The version information. */
+ struct bfd_elf_version_tree *version_info;
};
/* This structures holds a set of callback functions. These are called
diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index 9bc363f..7c8e55b 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -1535,7 +1535,7 @@ gld${EMULATION_NAME}_before_allocation (void)
(link_info.output_bfd, command_line.soname, rpath,
command_line.filter_shlib, audit, depaudit,
(const char * const *) command_line.auxiliary_filters,
- &link_info, &sinterp, lang_elf_version_info)))
+ &link_info, &sinterp)))
einfo ("%P%F: failed to set dynamic section sizes: %E\n");
${ELF_INTERPRETER_SET_DEFAULT}
diff --git a/ld/emultempl/solaris2.em b/ld/emultempl/solaris2.em
index 0b77375..2c24467 100644
--- a/ld/emultempl/solaris2.em
+++ b/ld/emultempl/solaris2.em
@@ -76,7 +76,8 @@ elf_solaris2_before_allocation (void)
/* Only do this if emitting a shared object and versioning is in place. */
if (link_info.shared
- && (lang_elf_version_info != NULL || link_info.create_default_symver))
+ && (link_info.version_info != NULL
+ || link_info.create_default_symver))
{
struct bfd_elf_version_expr *globals = NULL, *locals = NULL;
struct bfd_elf_version_tree *basever;
diff --git a/ld/ldlang.c b/ld/ldlang.c
index 5b548d0..7251a86 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -7458,10 +7458,6 @@ lang_leave_overlay (etree_type *lma_expr,
/* Version handling. This is only useful for ELF. */
-/* This global variable holds the version tree that we build. */
-
-struct bfd_elf_version_tree *lang_elf_version_info;
-
/* If PREV is NULL, return first version pattern matching particular symbol.
If PREV is non-NULL, return first version pattern matching particular
symbol after PREV (previously returned by lang_vers_match). */
@@ -7803,8 +7799,8 @@ lang_register_vers_node (const char *name,
if (name == NULL)
name = "";
- if ((name[0] == '\0' && lang_elf_version_info != NULL)
- || (lang_elf_version_info && lang_elf_version_info->name[0] == '\0'))
+ if (link_info.version_info != NULL
+ && (name[0] == '\0' || link_info.version_info->name[0] == '\0'))
{
einfo (_("%X%P: anonymous version tag cannot be combined"
" with other version tags\n"));
@@ -7813,7 +7809,7 @@ lang_register_vers_node (const char *name,
}
/* Make sure this node has a unique name. */
- for (t = lang_elf_version_info; t != NULL; t = t->next)
+ for (t = link_info.version_info; t != NULL; t = t->next)
if (strcmp (t->name, name) == 0)
einfo (_("%X%P: duplicate version tag `%s'\n"), name);
@@ -7825,7 +7821,7 @@ lang_register_vers_node (const char *name,
for (e1 = version->globals.list; e1 != NULL; e1 = e1->next)
{
- for (t = lang_elf_version_info; t != NULL; t = t->next)
+ for (t = link_info.version_info; t != NULL; t = t->next)
{
struct bfd_elf_version_expr *e2;
@@ -7852,7 +7848,7 @@ lang_register_vers_node (const char *name,
for (e1 = version->locals.list; e1 != NULL; e1 = e1->next)
{
- for (t = lang_elf_version_info; t != NULL; t = t->next)
+ for (t = link_info.version_info; t != NULL; t = t->next)
{
struct bfd_elf_version_expr *e2;
@@ -7888,7 +7884,7 @@ lang_register_vers_node (const char *name,
else
version->vernum = 0;
- for (pp = &lang_elf_version_info; *pp != NULL; pp = &(*pp)->next)
+ for (pp = &link_info.version_info; *pp != NULL; pp = &(*pp)->next)
;
*pp = version;
}
@@ -7904,7 +7900,7 @@ lang_add_vers_depend (struct bfd_elf_version_deps *list, const char *name)
ret = (struct bfd_elf_version_deps *) xmalloc (sizeof *ret);
ret->next = list;
- for (t = lang_elf_version_info; t != NULL; t = t->next)
+ for (t = link_info.version_info; t != NULL; t = t->next)
{
if (strcmp (t->name, name) == 0)
{
diff --git a/ld/ldlang.h b/ld/ldlang.h
index a6d22ce..533fe74 100644
--- a/ld/ldlang.h
+++ b/ld/ldlang.h
@@ -628,8 +628,6 @@ extern void lang_leave_overlay
(etree_type *, int, fill_type *, const char *,
lang_output_section_phdr_list *, const char *);
-extern struct bfd_elf_version_tree *lang_elf_version_info;
-
extern struct bfd_elf_version_expr *lang_new_vers_pattern
(struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
extern struct bfd_elf_version_tree *lang_new_vers_node
diff --git a/ld/pe-dll.c b/ld/pe-dll.c
index 682ce46..7848063 100644
--- a/ld/pe-dll.c
+++ b/ld/pe-dll.c
@@ -718,13 +718,10 @@ process_def_file_and_drectve (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *
bfd_boolean would_export = symbols[j]->section != &bfd_und_section
&& ((symbols[j]->flags & BSF_GLOBAL)
|| (symbols[j]->flags == 0));
- if (lang_elf_version_info && would_export)
- {
- bfd_boolean hide = 0;
- (void) bfd_find_version_for_sym (lang_elf_version_info,
- symbols[j]->name, &hide);
- would_export = !hide;
- }
+ if (link_info.version_info && would_export)
+ would_export
+ = !bfd_hide_sym_by_version (link_info.version_info,
+ symbols[j]->name);
if (would_export)
{
const char *sn = symbols[j]->name;
diff --git a/ld/plugin.c b/ld/plugin.c
index 0be7fa3..b172111 100644
--- a/ld/plugin.c
+++ b/ld/plugin.c
@@ -454,6 +454,10 @@ is_visible_from_outside (struct ld_plugin_symbol *lsym, asection *section,
return TRUE;
if (link_info.export_dynamic || link_info.shared)
{
+ /* Check if symbol is hidden by version script. */
+ if (bfd_hide_sym_by_version (link_info.version_info,
+ blhe->root.string))
+ return FALSE;
/* Only ELF symbols really have visibility. */
if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour)
{
diff --git a/ld/testsuite/ld-elf/pr12975.d b/ld/testsuite/ld-elf/pr12975.d
new file mode 100644
index 0000000..549e8d5
--- /dev/null
+++ b/ld/testsuite/ld-elf/pr12975.d
@@ -0,0 +1,10 @@
+#ld: --gc-sections -shared -version-script pr12975.t
+#readelf: -s --wide
+#notarget: arc-*-* d30v-*-* dlx-*-* i960-*-* or32-*-* pj*-*-*
+#notarget: hppa64-*-* i370-*-* i860-*-* ia64-*-* mep-*-* mn10200-*-*
+# generic linker targets don't support --gc-sections, nor do a bunch of others
+
+#failif
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9]+ +FUNC +LOCAL +DEFAULT +[1-9]+ bar
+#...
diff --git a/ld/testsuite/ld-elf/pr12975.s b/ld/testsuite/ld-elf/pr12975.s
new file mode 100644
index 0000000..7429121
--- /dev/null
+++ b/ld/testsuite/ld-elf/pr12975.s
@@ -0,0 +1,10 @@
+ .section .text.foo,"ax",%progbits
+ .globl foo
+ .type foo, %function
+foo:
+ .byte 0
+ .section .text.bar,"ax",%progbits
+ .type bar, %function
+ .globl bar
+bar:
+ .byte 0
diff --git a/ld/testsuite/ld-elf/pr12975.t b/ld/testsuite/ld-elf/pr12975.t
new file mode 100644
index 0000000..902c1f7
--- /dev/null
+++ b/ld/testsuite/ld-elf/pr12975.t
@@ -0,0 +1,6 @@
+{
+global:
+ foo;
+local:
+ *;
+};