The deleted function was to destructively overwrite existing method
entries, which is now considered to be a bad idea. Delete it, and
assign a newly created method entry instead.
Before this changeset rb_method_definition_create only allocated a
memory region and we had to destructively initialize it later.
That is not a good design so we change the API to return a complete
struct instead.
Most (if not all) of the fields of rb_method_definition_t are never
meant to be modified once after they are stored. Marking them const
makes it possible for compilers to warn on unintended modifications.
If a method accepts no keywords and was called with a keyword, an
ArgumentError was not always issued previously. Force methods that
accept no keywords to go through setup_parameters_complex so that
an ArgumentError is raised if keywords are provided.
This approach uses a flag bit on the final hash object in the regular splat,
as opposed to a previous approach that used a VM frame flag. The hash flag
approach is less invasive, and handles some cases that the VM frame flag
approach does not, such as saving the argument splat array and splatting it
later:
ruby2_keywords def foo(*args)
@args = args
bar
end
def bar
baz(*@args)
end
def baz(*args, **kw)
[args, kw]
end
foo(a:1) #=> [[], {a: 1}]
foo({a: 1}, **{}) #=> [[{a: 1}], {}]
foo({a: 1}) #=> 2.7: [[], {a: 1}] # and warning
foo({a: 1}) #=> 3.0: [[{a: 1}], {}]
It doesn't handle some cases that the VM frame flag handles, such as when
the final hash object is replaced using Hash#merge, but those cases are
probably less common and are unlikely to properly support keyword
argument separation.
Use ruby2_keywords to handle argument delegation in the delegate library.
I noticed that in case of cache misshit, re-calculated cc->me can
be the same method entry than the pevious one. That is an okay
situation but can't we partially reuse the cache, because cc->call
should still be valid then?
One thing that has to be special-cased is when the method entry
gets amended by some refinements. That happens behind-the-scene
of call cache mechanism. We have to check if cc->me->def points to
the previously saved one.
Calculating -------------------------------------
trunk ours
vm2_poly_same_method 1.534M 2.025M i/s - 6.000M times in 3.910203s 2.962752s
Comparison:
vm2_poly_same_method
ours: 2025143.9 i/s
trunk: 1534447.2 i/s - 1.32x slower
Make sure that vm_yield_with_cfunc can correctly set the empty keyword
flag by passing 2 as the kw_splat value when calling it in
vm_invoke_ifunc_block. Make sure calling.kw_splat is set to 1 and not
128 in vm_sendish, so we can safely check for different kw_splat values.
vm_args.c needs to call add_empty_keyword, and to make JIT happy, the
function needs to be exported. Rename the function to
rb_adjust_argv_kw_splat to more accurately reflect what it does, and
mark it as MJIT exported.
Also add keyword argument separation warnings for Class#new and Method#call.
To allow for keyword argument to required positional hash converstion in
cfuncs, add a vm frame flag indicating the cfunc was called with an empty
keyword hash (which was removed before calling the cfunc). The cfunc can
check this frame flag and add back an empty hash if it is passing its
arguments to another Ruby method. Add rb_empty_keyword_given_p function
for checking if called with an empty keyword hash, and
rb_add_empty_keyword for adding back an empty hash to argv.
All of this empty keyword argument support is only for 2.7. It will be
removed in 3.0 as Ruby 3 will not convert empty keyword arguments to
required positional hash arguments. Comment all of the relevent code
to make it obvious this is expected to be removed.
Add rb_funcallv_kw as an public C-API function, just like rb_funcallv
but with a keyword flag. This is used by rb_obj_call_init (internals
of Class#new). This also required expected call_type enum with
CALL_FCALL_KW, similar to the recent addition of CALL_PUBLIC_KW.
Add rb_vm_call_kw as a internal function, used by call_method_data
(internals of Method#call and UnboundMethod#bind_call). Add tests
for UnboundMethod#bind_call keyword handling.
This is the same as the bmethod, sym proc, and send cases,
where we don't remove the keyword splat, so later code can
move it to a required positional parameter and warn.
This is the same as the bmethod and send cases, where we don't
remove the keyword splat, so later code can move it to to a
a required positional parameter and warn.
The lambda case is similar to the attr_writer case, except we have
to determine the number of required parameters from the iseq
instead of being able to assume a single required parameter.
This fixes a lot of lambda tests which were switched to require
warnings for all usage of keyword arguments. Similar to method
handling, we do not warn when passing keyword arguments to
lambdas that do not accept keyword arguments, the argument is
just passed as a positional hash in that case, unless it is empty.
If it is empty and not the final required parameter, then we
ignore it. If it is empty and the final required parameter, then
we pass it for backwards compatibility and emit a warning, as in
Ruby 3 we will not pass it.
The bmethod case is similar to the send case, in that we do not
want to remove empty keyword splats in vm_call_bmethod, as that
prevents later call handling from moving them to required
positional arguments and warning.
In general, we want to ignore empty keyword hashes. The only case
where we want to allow them for backwards compatibility is when
they are necessary to satify the final required positional argument.
In that case, we want to not ignore them, but we do want to warn,
as that will be going away in Ruby 3.
This commit implements this support for regular methods and
attr_writer methods.
In order to allow send to forward arguments correctly, send no
longer removes empty keyword hashes. It is the responsibility of
the final method to remove the empty keyword hashes now. This
change was necessary as otherwise send could remove the empty
keyword hashes before the regular or attr_writer methods could
move them to required positional arguments.
For completeness, add tests for keyword handling regular
methods calls.
This makes rb_warn_keyword_to_last_hash non-static in vm_args.c
so it can be reused in vm_insnhelper.c, and also moves declarations
before statements in the rb_warn_* functions in vm_args.c.
While doing so is not backwards compatible with Ruby 2.6, it is
necessary for generic argument forwarding to work for all methods:
```ruby
def foo(*args, **kw, &block)
bar(*args, **kw, &block)
end
```
If you do not remove empty keyword hashes, and bar does not accept
keyword arguments, then a call to foo without keyword arguments
calls bar with an extra positional empty hash argument.
Actually, the following call is wrongly warned without this change.
```
class C
def method_missing(x, *args, **opt)
end
end
C.new.foo(k: 1)
# warning: The last argument is used as the keyword parameter
# warning: for `method_missing' defined here
```
...only when a "remove_empty_keyword_hash" flag is specified.
After CALLER_SETUP_ARG is called, `ci->flag & VM_CALL_KW_SPLAT` must not
be used. Instead. use `calling->kw_splat`. This is because
CALLER_SETUP_ARG may modify argv and update `calling->kw_splat`, and
`ci->flag & VM_CALL_KW_SPLAT` may be inconsistent with the result.
There are two styles that argv contains keyword arguments: one is
VM_CALL_KWARG which contains value elements in argv (to avoid a hash
object creation if possible), and the other is VM_CALL_KW_SPLAT which
contains one last hash in argv.
vm_caller_setup_arg_kw translates argv from the VM_CALL_KWARG style to
the VM_CALL_KW_SPLAT style.
`calling->kw_splat` means that argv is the VM_CALL_KW_SPLAT style.
So, instead of setting `calling->kw_splat` at many places, it would be
better to do so when vm_caller_setup_arg_kw is called.
This is needed for C functions to call methods with keyword arguments.
This is a copy of rb_funcall_with_block with an extra argument for
the keyword flag.
There isn't a clean way to implement this that doesn't involve
changing a lot of function signatures, because rb_call doesn't
support a way to mark that the call has keyword arguments. So hack
this in using a CALL_PUBLIC_KW call_type, which we switch for
CALL_PUBLIC later in the call stack.
We do need to modify rm_vm_call0 to take an argument for whether
keyword arguments are used, since the call_type is no longer
available at that point. Use the passed in value to set the
appropriate keyword flag in both calling and ci_entry.
The kw_splat flag is whether the original call passes keyword or not.
Some types of methods (e.g., bmethod and sym_proc) drops the
information. This change tries to propagate the flag to the final
callee, as far as I can.
After 5e86b005c0, I now think ANYARGS is
dangerous and should be extinct. This commit deletes ANYARGS from
struct vm_ifunc, but in doing so we also have to decouple the usage
of this struct in compile.c, which (I think) is an abuse of ANYARGS.
This was an intentional bug added in 1.9.
The approach taken here is to add a second operand to the
getconstant instruction for whether nil should be allowed and
treated as current scope.
Fixes [Bug #11718]
Methods on duplicated class/module refer same constant inline
cache (IC). Constant access lookup should be done for cloned
class/modules but inline cache doesn't check it.
To check it, this patch introduce new RCLASS_CLONED flag which
are set when if class/module is cloned (both orig and dst).
[Bug #15877]
only when its receiver and the argument are both Integers.
Since 6bedbf4625, Integer#[] has supported a range extraction.
This means that Integer#[] now accepts multiple arguments, which made
the method very slow unfortunately.
This change fixes the performance issue by adding a special handling for
its traditional use case: `num[idx]` where both `num` and `idx` are
Integers.
* internal.h (UNALIGNED_MEMBER_ACCESS, UNALIGNED_MEMBER_PTR):
moved from eval_intern.h.
* compile.c iseq.c, vm.c: use UNALIGNED_MEMBER_PTR for `entries`
in `struct iseq_catch_table`.
* vm_eval.c, vm_insnhelper.c: use UNALIGNED_MEMBER_PTR for `body`
in `rb_method_definition_t`.
ec->cfp->iseq might not exist at the very beginning of a thread.
=================================================================
==82954==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fc86f334810 at pc 0x55ceaf013125 bp 0x7ffe2eddbbf0 sp 0x7ffe2eddbbe8
READ of size 8 at 0x7fc86f334810 thread T0
#0 0x55ceaf013124 in vm_check_canary vm_insnhelper.c:217:24
#1 0x55ceaefb4796 in vm_push_frame vm_insnhelper.c:276:5
#2 0x55ceaf0124bd in th_init vm.c:2661:5
#3 0x55ceaf00d5eb in ruby_thread_init vm.c:2690:5
#4 0x55ceaf00d4b1 in rb_thread_alloc vm.c:2703:5
#5 0x55ceaef0038b in thread_s_new thread.c:872:20
#6 0x55ceaf04d8c1 in call_cfunc_m1 vm_insnhelper.c:2041:12
#7 0x55ceaf03118d in vm_call_cfunc_with_frame vm_insnhelper.c:2207:11
#8 0x55ceaf017985 in vm_call_cfunc vm_insnhelper.c:2225:12
#9 0x55ceaf01548b in vm_call_method_each_type vm_insnhelper.c:2560:9
#10 0x55ceaf014c96 in vm_call_method vm_insnhelper.c:2686:13
#11 0x55ceaefb5de4 in vm_call_general vm_insnhelper.c:2730:12
#12 0x55ceaf03c868 in vm_sendish vm_insnhelper.c:3623:11
#13 0x55ceaefc95bb in vm_exec_core insns.def:771:11
#14 0x55ceaf006700 in rb_vm_exec vm.c:1892:22
#15 0x55ceaf00acbf in rb_iseq_eval_main vm.c:2151:11
#16 0x55ceaea250ca in ruby_exec_internal eval.c:262:2
#17 0x55ceaea2498b in ruby_exec_node eval.c:326:12
#18 0x55ceaea247d0 in ruby_run_node eval.c:318:25
#19 0x55ceae88c486 in main main.c:42:9
#20 0x7fc874330b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
#21 0x55ceae7e5289 in _start (miniruby+0x15f289)
0x7fc86f334810 is located 16 bytes to the right of 1048576-byte region [0x7fc86f234800,0x7fc86f334800)
allocated by thread T0 here:
#0 0x55ceae85d56d in malloc (miniruby+0x1d756d)
#1 0x55ceaea71d12 in objspace_xmalloc0 gc.c:9416:5
#2 0x55ceaea71cd2 in ruby_xmalloc2_body gc.c:9623:12
#3 0x55ceaea7d09c in ruby_xmalloc2 gc.c:11479:12
#4 0x55ceaf00c3b7 in rb_thread_recycle_stack vm.c:2462:12
#5 0x55ceaf012256 in th_init vm.c:2656:29
#6 0x55ceaf00d5eb in ruby_thread_init vm.c:2690:5
#7 0x55ceaf00d4b1 in rb_thread_alloc vm.c:2703:5
#8 0x55ceaef0038b in thread_s_new thread.c:872:20
#9 0x55ceaf04d8c1 in call_cfunc_m1 vm_insnhelper.c:2041:12
#10 0x55ceaf03118d in vm_call_cfunc_with_frame vm_insnhelper.c:2207:11
#11 0x55ceaf017985 in vm_call_cfunc vm_insnhelper.c:2225:12
#12 0x55ceaf01548b in vm_call_method_each_type vm_insnhelper.c:2560:9
#13 0x55ceaf014c96 in vm_call_method vm_insnhelper.c:2686:13
#14 0x55ceaefb5de4 in vm_call_general vm_insnhelper.c:2730:12
#15 0x55ceaf03c868 in vm_sendish vm_insnhelper.c:3623:11
#16 0x55ceaefc95bb in vm_exec_core insns.def:771:11
#17 0x55ceaf006700 in rb_vm_exec vm.c:1892:22
#18 0x55ceaf00acbf in rb_iseq_eval_main vm.c:2151:11
#19 0x55ceaea250ca in ruby_exec_internal eval.c:262:2
#20 0x55ceaea2498b in ruby_exec_node eval.c:326:12
#21 0x55ceaea247d0 in ruby_run_node eval.c:318:25
#22 0x55ceae88c486 in main main.c:42:9
#23 0x7fc874330b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
SUMMARY: AddressSanitizer: heap-buffer-overflow vm_insnhelper.c:217:24 in vm_check_canary
Shadow bytes around the buggy address:
0x0ff98de5e8b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff98de5e8c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff98de5e8d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff98de5e8e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff98de5e8f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ff98de5e900: fa fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff98de5e910: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff98de5e920: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff98de5e930: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff98de5e940: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff98de5e950: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==82954==ABORTING
When reviewing r66565, I overlooked that `GET_ISEQ()` and `GET_EP()` are
NOT `ec->cfp->iseq` and `ec->cfp->ep` but `reg_cfp->iseq` and
`reg_cfp->ep`.
`vm_push_frame` updates `ec->cfp` and in this case we want to check the
callee's cfp and so `ec->cfp` should be checked instead.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67522 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* insns.def: add definemethod and definesmethod (singleton method)
instructions. Old YARV contains these instructions, but it is moved
to methods of FrozenCore class because remove number of instructions
can improve performance for some techniques (static stack caching
and so on). However, we don't employ these technique and it is hard
to optimize/analysis definition sequence. So I decide to introduce
them (and remove definition methods). `putiseq` insn is also removed.
* vm_method.c (rb_scope_visibility_get): renamed to
`vm_scope_visibility_get()` and make it accept `ec`.
Same for `vm_scope_module_func_check()`.
These fixes are result of refactoring `vm_define_method`.
* vm_insnhelper.c (rb_vm_get_cref): renamed to `vm_get_cref`
because of consistency with other functions.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67442 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
cfp->bp was (re-)introduced by Kokubun san, but VM doesn't use it
because I (ko1) want to remove it in a future. But using it make
leave instruction fast because of sp consisntency check.
So now VM uses cfp->bp.
To use cfp->bp, I checked the value and I found that it is not a
"initial value of sp" but a "initial value of ep". Fix this problem
and fix all bp references (this is why bp is renamed to bp_).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67342 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Add counters to count ccf (call cache fastpath) usage.
These counters will help which kind of method dispatch
is important to optimize.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
similar idea to r67315, provide the following optimization
for method dispatch with lead and kw parameters.
(1) add a special branch to check passing kw arguments to
a method which has lead and kw parameters.
ex) def foo(x, k:1); end; foo(0, k:1)
(2) add a special branch to check passing no-kw arguments to
a method which has lead and kw parameters.
ex) def foo(x, k:1); end; foo(0)
For (1) and (2) cases, provide special dispatchers. For (2) case,
this patch only use the special dispatcher if all default
kw parameters are literal values (nil, 1, and so on. In other case,
kw->default_values does not contains Qundef) (and no required kw
parameters becaseu they don't pass any keyword parameters).
Passing keyword arguments with a hash object is not a scope of
this patch.
Without this patch, (1) and (2) cases use `setup_parameters_complex()`.
Especially, (2) seems frequent case for methods which extend a normal
usecase with keyword parameters (like: `exception: true`).
We can measure the performance with benchmark-driver:
With methods: def kw k1:1, k2:2; end
def m; end
With the following binaries:
clean-miniruby: unmodified trunk.
opt_miniruby1: use special branches for lead/kw parameters.
opt_miniruby2: use special dispatchers for lead/kw parameters.
opt_cc_miniruby: apply step (2).
Result with benchmark-driver:
m
opt_miniruby2: 75222278.0 i/s
clean-miniruby: 73177896.5 i/s - 1.03x slower
opt_miniruby1: 62466783.3 i/s - 1.20x slower
kw
opt_miniruby2: 52044504.4 i/s
opt_miniruby1: 29142025.7 i/s - 1.79x slower
clean-miniruby: 20515235.4 i/s - 2.54x slower
kw k1: 10
opt_miniruby2: 26492219.5 i/s
opt_miniruby1: 25409484.9 i/s - 1.04x slower
clean-miniruby: 20235113.7 i/s - 1.31x slower
kw k1: 10, k2: 20
opt_miniruby1: 24159534.0 i/s
opt_miniruby2: 23470527.5 i/s - 1.03x slower
clean-miniruby: 17822621.5 i/s - 1.36x slower
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67333 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
because it's not used outside vm*.c, and also having non-static function
without MJIT_STATIC is harmful for mswin JIT system.
I hope this fix mswin test failure starting from r67315.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67328 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
There is a special optimization for "only lead parameters"
method dispatch using specialized dispatcher functions
`vm_call_iseq_setup_normal_0start...`.
Other cases (opt, rest, post, ...) we don't use specialized
dispatcher and call with `setup_parameters_complex` to
satisfy Ruby's complex parameter specification.
This commit introduce a specialize dispatcher for
methods which use only lead and optional parameters.
Two step improvements:
(1) prepare "lead/opt" only check pass.
It is to skip the `setup_parameters_complex` function.
(2) introduce specialized dispatcher for only "lead/opt"
parameters methods (vm_call_iseq_setup_normal_opt_start).
With these improvements, we achieved good micro-benchmark
results:
With a method: `def opt2 a, b=nil; end`
With the following binaries:
clean-miniruby: unmodified trunk.
opt_miniruby: apply step (1).
opt_cc_miniruby: apply step (2).
Result with benchmark-driver:
opt2(1)
opt_cc_miniruby: 42269409.1 i/s
opt_miniruby: 36304428.3 i/s - 1.16x slower
clean-miniruby: 25897409.5 i/s - 1.63x slower
opt2(1, 2)
opt_cc_miniruby: 45935145.7 i/s
opt_miniruby: 40513196.9 i/s - 1.13x slower
clean-miniruby: 29976057.6 i/s - 1.53x slower
This improvement may be trivial (difficult to improve practical
cases). However, this is enough small patch so I decide to
introduce it.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67315 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* vm_insnhelper.c: change `call_cfunc_*` parameters order
and specify a function type for the passed func ptr.
This fix reduce the number of asm instructions, such as:
# before this patch
0000000000000110 <call_cfunc_0>:
110: 48 89 fa mov %rdi,%rdx
113: 31 c0 xor %eax,%eax
115: 48 89 f7 mov %rsi,%rdi
118: ff e2 jmpq *%rdx
11a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
# after this patch
0000000000000110 <call_cfunc_0>:
110: ff e1 jmpq *%rcx
However, this kind of instruction reduction doesn't affect
any performance because of great CPU architectures :p
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67122 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
In addition to detect dead canary, we try to detect the very moment
when we smash the stack top. Requested by k0kubun:
https://twitter.com/k0kubun/status/1085180749899194368
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66981 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
and functions to clarify the intention and make sure it's not used in a
surprising way (like using 2, 3, ... other than 0, 1 even while it seems
to be a boolean).
This is a retry of r66775. It included some typos...
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This reverts commit bb1a1aeab0.
We hit something on ci.rvm.jp, reverting until investigation is done.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66776 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
and functions to clarify the intention and make sure it's not used in a
surprising way (like using 2, 3, ... other than 0, 1 even while it seems
to be a boolean).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66775 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This changeset should fix the 32bit failures.
See also: https://travis-ci.org/ruby/ruby/jobs/472855470
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66601 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
- FIXNUM_2_P: moved to vm_insnhelper.c because that is the only
place this macro is used.
- FLONUM_2_P: ditto.
- FLOAT_HEAP_P: not used anywhere.
- FLOAT_INSTANCE_P: ditto.
- GET_TOS: ditto.
- USE_IC_FOR_SPECIALIZED_METHOD: ditto.
- rb_obj_hidden_p: ditto.
- REG_A: ditto.
- REG_B: ditto.
- GET_CONST_INLINE_CACHE: ditto.
- vm_regan_regtype: moved inside of VM_COLLECT_USAGE_DETAILS
because that os the only place this enum is used.
- vm_regan_acttype: ditto.
- GET_GLOBAL: used only once. Removed with replacing that usage.
- SET_GLOBAL: ditto.
- rb_method_definition_create: declaration moved to
vm_insnhelper.c because that is the only place this declaration
makes sense.
- rb_method_definition_set: ditto.
- rb_method_definition_eq: ditto.
- rb_make_no_method_exception: ditto.
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