卜部昌平 9ef51b0b89 drop-in type check for rb_define_method ... The rb_define_method function takes a pointer to ANYARGS-ed functions, which in fact varies 18 different prototypes. We still need to preserve ANYARGS for storages but why not check the consistencies if possible. Q&As: Q: Where did the magic number "18" came from in the description above? A: Count the case branch of vm_method.c:call_cfunc_invoker_func(). Note also that the 18 branches has lasted for at least 25 years. See also 200e0ee2fd. Q: What is this __weakref__ thing? A: That is a kind of function overloading mechanism that GCC provides. In this case for instance rb_define_method0 is an alias of rb_define_method, with a strong type. Q: What is this __transparent_union__ thing? A: That is another kind of function overloading mechanism that GCC provides. In this case the attributed function pointer is either VALUE(*)(int,VALUE*,VALUE) or VALUE(*)(int,const VALUE*,VALUE). This is better than void* or ANYARGS because we can reject all other possibilities than the two. Q: What does this rb_define_method macro mean? A: It selects appropriate alias of the rb_define_method function, depending on the arity. Q: Why the prototype change of rb_f_notimplement? A: Function pointer to rb_f_notimplement is special cased in vm_method.c:rb_add_method_cfunc(). That should be handled by the __builtin_choose_expr chain inside of rb_define_method macro expansion. In order to do so, comparison like (func == rb_f_notimplement) is inappropriate for __builtin_choose_expr's expression (which must be a compile-time integer constant but the address of rb_f_notimplement is not fixed until the linker). So instead we are using __builtin_types_compatible_p, and in doing so we need to distinguish rb_f_notimplement from others, by type.		2019-08-29 18:34:09 +09:00
..
backward
assert.h	Revert "Always evaluate the expression RUBY_ASSERT_MESG_WHEN just once"	2019-08-05 08:55:09 +09:00
backward.h	Renamed ruby_finalize_{0,1}	2019-08-13 09:47:08 +09:00
debug.h	Revert "vm_trace: implement postponed_jobs as st_table"	2018-10-23 03:47:45 +00:00
defines.h	Remove IA64 support.	2019-06-19 23:30:04 +12:00
encoding.h	rb_enc_alias	2018-06-28 23:46:59 +00:00
intern.h	drop-in type check for rb_define_method	2019-08-29 18:34:09 +09:00
io.h	io.c: export rb_io_extract_modeenc	2019-08-14 11:20:58 +09:00
missing.h	include/ruby/missing.h: defined(__cplusplus) before using __cplusplus	2018-06-05 14:16:50 +00:00
onigmo.h	Reduce ONIG_NREGION from 10 to 4: power of 2 and testing revealed most pattern matches are less than or equal to 4 results	2019-05-07 21:58:55 +09:00
oniguruma.h
re.h	Remove member char_offset_updated from struct rmatch as member char_offset_num_allocated can serve the same purpose as that predicate	2019-04-24 02:02:05 +09:00
regex.h
ruby.h	drop-in type check for rb_define_method	2019-08-29 18:34:09 +09:00
st.h	struct st_hash_type now free from ANYARGS	2019-08-27 15:52:26 +09:00
subst.h
thread.h	introduce rb_nogvl C-API to mark ubf as async-signal-safe	2019-01-04 13:14:11 +00:00
thread_native.h
util.h	util.h: remove my_getcwd	2017-11-26 01:36:33 +00:00
version.h	version.h (RUBY_VERSION): 2.7.0 development has started.	2018-12-25 13:45:17 +00:00
vm.h	ViewVC of svn.ruby-lang.org was shutdown status.	2019-04-22 19:37:22 +09:00
win32.h	Fix errno at seeking socket/pipe on Windows	2019-07-25 06:39:40 +09:00