* Defining a libobjc.so.2 ABI
@ 2010-02-24 15:10 Rainer Orth
2010-02-24 16:09 ` Andreas Schwab
0 siblings, 1 reply; 3+ messages in thread
From: Rainer Orth @ 2010-02-24 15:10 UTC (permalink / raw)
To: gcc
After I'm done with supporting Sun symbol versioning in the currently
versioned GCC runtime libraries, I've started investigating versioning
the remaining unversioned ones.
One of them is libobjc.so.4. To start, I've looked at the global symbols
in the library with
$ nm -Pgn libobjc.so.4 | awk '$2 !~ /U/ {print $1}'
on i386-pc-solaris2.11. Here's what I found:
__bss_start generated by ld
__gnu_objc_personality_v0 EH support (public)
__objc_add_class_to_hash runtime.h (internal)
__objc_class_links_resolved runtime.h (internal)
__objc_class_name_NXConstantString objc-act.c (public)
__objc_class_name_Object objc-act.c? (public)
__objc_class_name_Protocol objc-act.c (public)
__objc_close_thread_system thr.h (internal)
__objc_fini_thread_system
__objc_condition_allocate thr.h (internal)
__objc_condition_broadcast thr.h (internal)
__objc_condition_deallocate thr.h (internal)
__objc_condition_signal thr.h (internal)
__objc_condition_wait thr.h (internal)
__objc_dangling_categories init.c (unused?)
__objc_exec_class objc-act.c (public?)
__objc_force_linking init.c (internal?)
__objc_generate_gc_type_description runtime.h (internal)
__objc_get_forward_imp sendmsg.c (internal?)
__objc_init_class_tables runtime.h (internal)
__objc_init_dispatch_tables runtime.h (internal)
__objc_init_selector_tables runtime.h (internal)
__objc_init_thread_system runtime.h (internal)
thr.h (internal)
__objc_install_premature_dtable runtime.h (internal)
__objc_is_multi_threaded thr.c (internal)
__objc_linking linking.m (internal)
__objc_msg_forward objc-api.h (public)
__objc_msg_forward2 objc-api.h (public)
__objc_mutex_allocate thr.h (internal)
__objc_mutex_deallocate thr.h (internal)
__objc_mutex_lock thr.h (internal)
__objc_mutex_trylock thr.h (internal)
__objc_mutex_unlock thr.h (internal)
__objc_object_alloc objects.c (internal)
__objc_object_copy objects.c (internal)
__objc_object_dispose objects.c (internal)
__objc_print_dtable_stats runtime.h (internal)
__objc_read_nbyte_uint archive.c (internal)
__objc_read_nbyte_ulong archive.c (internal)
__objc_register_instance_methods_to_class runtime.h (internal)
__objc_register_selectors_from_class runtime.h (internal)
__objc_register_selectors_from_list runtime.h (internal)
__objc_resolve_class_links runtime.h (internal)
__objc_responds_to runtime.h (internal)
__objc_runtime_mutex runtime.h (internal)
__objc_runtime_threads_alive runtime.h (internal)
__objc_selector_max_index runtime.h (internal)
__objc_sparse2_id sarray.h (internal)
__objc_thread_detach thr.h (internal)
__objc_thread_exit thr.h (internal)
__objc_thread_exit_status thr.h (internal)
__objc_thread_get_data thr.h (internal)
__objc_thread_get_priority thr.h (internal)
__objc_thread_id thr.h (internal)
__objc_thread_set_data thr.h (internal)
__objc_thread_set_priority thr.h (internal)
__objc_thread_yield thr.h (internal)
__objc_uninstalled_dtable sendmsg.c (internal)
__objc_update_dispatch_table_for_class sendmsg.c (internal)
__objc_write_class archive.c (internal)
__objc_write_object archive.c (internal)
__objc_write_selector archive.c (internal)
__sel_register_typed_name selector.c (internal)
_edata generated by ld
_end generated by ld
_etext generated by ld
_fini generated by ld
_init generated by ld
_lib_version imported from values-*.o
_objc_atomic_malloc objc-api.h (public)
_objc_became_multi_threaded thr.c (public, but undeclared)
_objc_calloc objc-api.h (public)
_objc_free objc-api.h (public)
_objc_load_callback objc-api.h (public)
_objc_lookup_class objc-api.h (public)
_objc_malloc objc-api.h (public)
_objc_object_alloc objc-api.h (public)
_objc_object_copy objc-api.h (public)
_objc_object_dispose objc-api.h (public)
_objc_realloc objc-api.h (public)
_objc_unexpected_exception objc-api.h (public)
_objc_valloc objc-api.h (public)
class_add_method_list runtime.h (internal)
class_create_instance objc-api.h (public)
class_get_class_method objc-api.h (public)
class_get_instance_method objc-api.h (public)
class_ivar_set_gcinvisible objc-api.h (public)
class_pose_as objc-api.h (public)
get_imp objc-api.h (public)
idxsize sarray.c (internal)
method_get_first_argument encoding.h (public)
method_get_next_argument encoding.h (public)
method_get_nth_argument encoding.h (public)
method_get_number_of_arguments encoding.h (public)
method_get_sizeof_arguments encoding.h (public)
narrays sarray.c (internal)
nbuckets sarray.c (internal)
nil_method nil_method.c (internal?)
nindices sarray.c (internal)
objc_aligned_size encoding.h (public)
objc_alignof_type encoding.h (public)
objc_atomic_malloc objc-api.h (public)
objc_calloc objc-api.h (public)
objc_close_typed_stream typedstream.h (public)
objc_condition_allocate thr.h (public)
objc_condition_broadcast thr.h (public)
objc_condition_deallocate thr.h (public)
objc_condition_signal thr.h (public)
objc_condition_wait thr.h (public)
objc_end_of_typed_stream typedstream.h (public)
objc_error objc-api.h (public)
objc_exception_throw exception.c (public)
objc-act.c (public?)
objc_flush_typed_stream typedstream.h (public)
objc_free objc-api.h (public)
objc_get_class objc-api.h (public)
objc_get_meta_class class.c (public?)
objc_get_stream_class_version typedstream.h (public)
objc_get_type_qualifiers encoding.h (public)
objc_get_uninstalled_dtable objc-api.h (public)
objc_hash_add hash.h (public)
objc_hash_delete hash.h (public)
objc_hash_is_key_in_hash hash.h (public)
objc_hash_new hash.h (public)
objc_hash_next hash.h (public)
objc_hash_remove hash.h (public)
objc_hash_value_for_key hash.h (public)
objc_layout_finish_structure encoding.h (public)
objc_layout_structure encoding.h (public)
objc_layout_structure_get_info encoding.h (public)
objc_layout_structure_next_member encoding.h (public)
objc_lookup_class objc-api.h (public)
objc_malloc objc-api.h (public)
objc_msg_lookup objc.h (public)
objc_msg_lookup_super objc-api.h (public)
objc_msg_sendv objc-api.h (public)
objc_mutex_allocate thr.h (public)
objc_mutex_deallocate thr.h (public)
objc_mutex_lock thr.h (public)
objc_mutex_trylock thr.h (public)
objc_mutex_unlock thr.h (public)
objc_next_class objc-api.h (public)
objc_open_typed_stream typedstream.h (public)
objc_open_typed_stream_for_file typedstream.h (public)
objc_promoted_size encoding.h (public)
objc_read_array typedstream.h (public)
objc_read_char archive.c (public?)
objc_read_int archive.c (public?)
objc_read_long archive.c (public?)
objc_read_object typedstream.h (public)
objc_read_selector archive.c (public?)
objc_read_short archive.c (public?)
objc_read_string archive.c (public?)
objc_read_type typedstream.h (public)
objc_read_types typedstream.h (public)
objc_read_unsigned_char archive.c (public?)
objc_read_unsigned_int archive.c (public?)
objc_read_unsigned_long archive.c (public?)
objc_read_unsigned_short archive.c (public?)
objc_realloc objc-api.h (public)
objc_set_error_handler objc-api.h (public)
objc_set_thread_callback thr.h (public)
objc_sizeof_type encoding.h (public)
objc_skip_argspec encoding.h (public)
objc_skip_offset encoding.h (public)
objc_skip_type_qualifiers encoding.h (public)
objc_skip_typespec encoding.h (public)
objc_thread_add thr.h (public)
objc_thread_detach thr.h (public)
objc_thread_exit thr.h (public)
objc_thread_get_data thr.h (public)
objc_thread_get_priority thr.h (public)
objc_thread_id thr.h (public)
objc_thread_remove thr.h (public)
objc_thread_set_data thr.h (public)
objc_thread_set_priority thr.h (public)
objc_thread_yield thr.h (public)
objc_valloc objc-api.h (public)
objc_verror objc-api.h (public)
objc_write_array typedstream.h (public)
objc_write_char archive.c (public?)
objc_write_int archive.c (public?)
objc_write_long archive.c (public?)
objc_write_object typedstream.h (public)
objc_write_object_reference typedstream.h (public)
objc_write_root_object typedstream.h (public)
objc_write_selector archive.c (public?)
objc_write_short archive.c (public?)
objc_write_string archive.c (public?)
objc_write_string_atomic archive.c (public?)
objc_write_type typedstream.h (public)
objc_write_types typedstream.h (public)
objc_write_unsigned_char archive.c (public?)
objc_write_unsigned_int archive.c (public?)
objc_write_unsigned_long archive.c (public?)
objc_write_unsigned_short archive.c (public?)
object_copy objc-api.h (public)
object_dispose objc-api.h (public)
sarray_at_put sarray.h (public)
sarray_at_put_safe sarray.h (public)
sarray_free sarray.h (public)
sarray_lazy_copy sarray.h (public)
sarray_new sarray.h (public)
sarray_realloc sarray.h (public)
sarray_remove_garbage sarray.h (public)
search_for_method_in_list runtime.h (internal)
sel_get_any_typed_uid objc-api.h (public)
sel_get_any_uid objc-api.h (public)
sel_get_name objc-api.h (public)
sel_get_type objc-api.h (public)
sel_get_typed_uid objc-api.h (public)
sel_get_uid objc-api.h (public)
sel_is_mapped objc-api.h (public)
sel_register_name objc-api.h (public)
sel_register_typed_name objc-api.h (public)
sel_types_match selector.c (private?)
Apart from the compiler/linker generated stuff, we're left with several
groups of functions:
* Those documented in public/installed header files and not mentioned as
internal/implementation details there. They are marked as public in
the list above.
* Those documented in public/installed header files, but marked as
internal/implemention details there, or only documented in runtime.h,
which isn't installed and thus not public. Marked as internal above.
* Some implementation details which are not user-callable, but need to
be exported nonetheless (like the stuff from gcc/objc/objc-act.c
above, plus __gnu_objc_personality_v0, needed for exception handling
support). I'm not sure about __objc_exec_class, though: it would be
best if someone knowledgable about the GNU Objective-C implementation
could augment the draft mapfile below with an appropriate
documentation. I've moved those to a separate OBJCABI_1.0 (probably
better named GOBCJABI_1.0) version, since they are not part of the
public interface.
* Several global variables are obviously implementation details, and
thus not part of the ABI (e.g. idxsize, narrays, nbuckets, nindices).
* A couple of unclear cases:
** _objc_became_multi_threaded is defined in thr.c. From the comment,
it is intended to be public, but is missing from thr.h. Should
probably just be added to the header.
** nil_method is defined in nil_method.c. I cannot say for sure if this
should be public.
** objc_get_meta_class is defined in class.c. Again, I don't know if
this should be part of the ABI.
** There are a number of objc_read_* and objc_write_* functions in
archive.c, but they are missing from typedstream.h. I suppose they
are just implementation details of the public functions, but would
like to get confirmation for that.
** sel_types_matches is defined in selector.c. I've no idea if this
should be public.
My current findings are documented in the draft mapfile below. I've
used this to rebuild libobjc.so.2 and rerun make check-objc successfully
on i386-pc-solaris2.11, so it seems to be basically sound. Before
proceeding with a proper implementation within a new GCC symbol
versioning `framework', I'd like to get confirmation that this is
sensible. Especially, I need answers to my questions about unclear
functions above.
Is there any public documentation of the libobjc API available anywhere?
libobjc/README mentions one that has never become available.
It would probably wise to check this against users of libobjc like
GNUStep.
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
# FIXME:
# * Naming, as always.
# * API documentation?
# * Check users like GNUStep.
# GNU libobjc.so public interface.
OBJC_2.0 {
global:
# <objc/encoding.h>
method_get_first_argument;
method_get_next_argument;
method_get_nth_argument;
method_get_number_of_arguments;
method_get_sizeof_arguments;
objc_aligned_size;
objc_alignof_type;
objc_get_type_qualifiers;
objc_layout_finish_structure;
objc_layout_structure;
objc_layout_structure_get_info;
objc_layout_structure_next_member;
objc_promoted_size;
objc_sizeof_type;
objc_skip_argspec;
objc_skip_offset;
objc_skip_type_qualifiers;
objc_skip_typespec;
# <objc/hash.h>
objc_hash_add;
objc_hash_delete;
objc_hash_is_key_in_hash;
objc_hash_new;
objc_hash_next;
objc_hash_remove;
objc_hash_value_for_key;
# <objc/objc-api.h>
__objc_msg_forward;
__objc_msg_forward2;
_objc_atomic_malloc;
_objc_calloc;
_objc_free;
_objc_load_callback;
_objc_lookup_class;
_objc_malloc;
_objc_object_alloc;
_objc_object_copy;
_objc_object_dispose;
_objc_realloc;
_objc_unexpected_exception;
_objc_valloc;
class_create_instance;
class_get_class_method;
class_get_instance_method;
class_ivar_set_gcinvisible;
class_pose_as;
get_imp;
objc_atomic_malloc;
objc_calloc;
objc_error;
objc_free;
objc_get_class;
# FIXME: Currently undeclared.
objc_get_meta_class;
objc_get_uninstalled_dtable;
objc_lookup_class;
objc_malloc;
objc_msg_lookup_super;
objc_msg_sendv;
objc_next_class;
objc_realloc;
objc_set_error_handler;
objc_valloc;
objc_verror;
object_copy;
object_dispose;
sel_get_any_typed_uid;
sel_get_any_uid;
sel_get_name;
sel_get_type;
sel_get_typed_uid;
sel_get_uid;
sel_is_mapped;
sel_register_name;
sel_register_typed_name;
# FIXME: Currently undeclared, private?
sel_types_match;
# <objc/objc.h>
objc_hash_add;
objc_hash_delete;
objc_hash_is_key_in_hash;
objc_hash_new;
objc_hash_next;
objc_hash_remove;
objc_hash_value_for_key;
objc_msg_lookup;
# <objc/sarray.h>
sarray_at_put;
sarray_at_put_safe;
sarray_free;
sarray_lazy_copy;
sarray_new;
sarray_realloc;
sarray_remove_garbage;
# <objc/thr.h>
# FIXME: Currently undeclared.
_objc_became_multi_threaded;
objc_condition_allocate;
objc_condition_broadcast;
objc_condition_deallocate;
objc_condition_signal;
objc_condition_wait;
objc_mutex_allocate;
objc_mutex_deallocate;
objc_mutex_lock;
objc_mutex_trylock;
objc_mutex_unlock;
objc_set_thread_callback;
objc_thread_add;
objc_thread_detach;
objc_thread_exit;
objc_thread_get_data;
objc_thread_get_priority;
objc_thread_id;
objc_thread_remove;
objc_thread_set_data;
objc_thread_set_priority;
objc_thread_yield;
# <objc/typedstream.h>
objc_close_typed_stream;
objc_end_of_typed_stream;
objc_flush_typed_stream;
objc_get_stream_class_version;
objc_open_typed_stream;
objc_open_typed_stream_for_file;
objc_read_array;
objc_read_object;
objc_read_type;
objc_read_types;
objc_write_array;
objc_write_object;
objc_write_object_reference;
objc_write_root_object;
objc_write_type;
objc_write_types;
# FIXME: Currently undeclared to end of block.
# Perhaps rather private?
objc_read_char;
objc_read_int;
objc_read_long;
objc_read_selector;
objc_read_short;
objc_read_string;
objc_read_unsigned_char;
objc_read_unsigned_int;
objc_read_unsigned_long;
objc_read_unsigned_short;
objc_write_char;
objc_write_int;
objc_write_long;
objc_write_selector;
objc_write_short;
objc_write_string;
objc_write_string_atomic;
objc_write_unsigned_char;
objc_write_unsigned_int;
objc_write_unsigned_long;
objc_write_unsigned_short;
local:
*;
};
# Private stuff for the GNU Objective-C implementation.
# FIXME: More than this?
# FIXME: Explain uses.
OBJCABI_1.0 {
global:
# Objective-C personality function for exception handling.
__gnu_objc_personality_v0;
# FIXME: Cf. objc/objc-act.c.
__objc_class_name_NXConstantString;
__objc_class_name_Object;
__objc_class_name_Protocol;
# FIXME: Cf. objc/objc-act.c.
__objc_exec_class;
# FIXME: Cf. objc/objc-act.c.
objc_exception_throw;
};
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Defining a libobjc.so.2 ABI
2010-02-24 15:10 Defining a libobjc.so.2 ABI Rainer Orth
@ 2010-02-24 16:09 ` Andreas Schwab
2010-03-01 20:31 ` Rainer Orth
0 siblings, 1 reply; 3+ messages in thread
From: Andreas Schwab @ 2010-02-24 16:09 UTC (permalink / raw)
To: Rainer Orth; +Cc: gcc
Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> writes:
> * Several global variables are obviously implementation details, and
> thus not part of the ABI (e.g. idxsize, narrays, nbuckets, nindices).
They should probably be renamed to be namespace-clean.
Andreas.
--
Andreas Schwab, schwab@redhat.com
GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84 5EC7 45C6 250E 6F00 984E
"And now for something completely different."
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Defining a libobjc.so.2 ABI
2010-02-24 16:09 ` Andreas Schwab
@ 2010-03-01 20:31 ` Rainer Orth
0 siblings, 0 replies; 3+ messages in thread
From: Rainer Orth @ 2010-03-01 20:31 UTC (permalink / raw)
To: Andreas Schwab; +Cc: gcc
Andreas Schwab <schwab@redhat.com> writes:
> Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> writes:
>
>> * Several global variables are obviously implementation details, and
>> thus not part of the ABI (e.g. idxsize, narrays, nbuckets, nindices).
>
> They should probably be renamed to be namespace-clean.
Right, probably something like __objc_<var>. This way, even targets
without symbol versioning can benefit.
Any other comments on the proposed ABI?
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
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