[ruby-core:121069] [Ruby master Feature#21140] Add a method to get the address of certain JIT related functions

Issue #21140 has been updated by tenderlovemaking (Aaron Patterson).


nobu (Nobuyoshi Nakada) wrote in #note-2:
> I think the functions belong to built-in classes can be exported simply, i.e., other than related to VM.
> I want to manage that list least as possible.

I understand.  I think though, if YJIT uses some function, then I think we should make that function available for 3rd party JITs.  Can we use YJIT's bindgen code to generate the list?  Then we don't have to specifically maintain a separate list.

I made a list of symbols that RJIT uses but are not available:

```
"rb_ary_entry_internal"
"rb_ary_tmp_new_from_values"
"rb_ary_unshift_m"
"rb_ec_ary_new_from_values"
"rb_ec_str_resurrect"
"rb_ensure_iv_list_size"
"rb_fix_aref"
"rb_fix_div_fix"
"rb_fix_mod_fix"
"rb_fix_mul_fix"
"rb_get_symbol_id"
"rb_gvar_get"
"rb_hash_new_with_size"
"rb_hash_resurrect"
"rb_obj_as_string_result"
"rb_reg_new_ary"
"rb_str_bytesize"
"rb_str_concat_literals"
"rb_str_eql_internal"
"rb_str_getbyte"
"rb_sym_to_proc"
"rb_vm_bh_to_procval"
"rb_vm_concat_array"
"rb_vm_defined"
"rb_vm_get_ev_const"
"rb_vm_getclassvariable"
"rb_vm_ic_hit_p"
"rb_vm_opt_newarray_hash"
"rb_vm_opt_newarray_max"
"rb_vm_opt_newarray_min"
"rb_vm_opt_newarray_pack"
"rb_vm_set_ivar_id"
"rb_vm_setclassvariable"
"rb_vm_setinstancevariable"
"rb_vm_splat_array"
"rb_vm_throw"
"rb_vm_yield_with_cfunc"
```

We could probably export many of these functions, but I guess there are a significant number of `rb_vm_*` functions.  If we could reuse YJIT's bindgen code, that might make maintenance easier.

----------------------------------------
Feature #21140: Add a method to get the address of certain JIT related functions
https://bugs.ruby-lang.org/issues/21140#change-111987

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
----------------------------------------
Feature #21116 extracted RJIT as a gem. But RJIT accesses certain internal functions which it cannot access as a gem.  For example it used the `rb_str_bytesize` function, but this symbol is not exported, so we cannot access it (even from a C extension).

Instead of exporting these symbols, I would like to propose an API for getting access to their addresses in Ruby.

For example

```ruby
RubyVM::RJIT.address_of(:rb_str_bytesize) # => 123456
```

I would like to limit the addresses to [this list](https://github.com/ruby/ruby/blob/f32d5071b7b01f258eb45cf533496d82d5c0f6a1/tool/rjit/bindgen.rb#L510-L578) which are the ones required by RJIT.



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