[ruby-core:97002] Re: [Ruby master Feature#16562] Expose rb_io_set_encoding_internal to reduce function calls on loading source files

Good questions aren=E2=80=99t nitpicks :-)

References this comment
https://github.com/ruby/ruby/pull/2829#discussion_r365477407 , but I may
have interpreted it too literal ...

On Mon, 27 Jan 2020 at 01:15, <[e-mail]> wrote:

> Issue #16562 has been updated by shyouhei (Shyouhei Urabe).
>
>
> This might be a nitpick but, can you tell us the reason why
> rb_io_set_encoding_internal has to be exposed (that is, callable from 3rd
> party extension libraries)?  I understand it needs to be non-`static` but
> it seems not need to be truly globally visible.  I guess I missed somethi=
ng.
>
> ----------------------------------------
> Feature #16562: Expose rb_io_set_encoding_internal to reduce function
> calls on loading source files
> https://bugs.ruby-lang.org/issues/16562#change-84058
>
> * Author: methodmissing (Lourens Naud=C3=A9)
> * Status: Open
> * Priority: Normal
> * Assignee:
> * Target version:
> ----------------------------------------
> References https://github.com/ruby/ruby/pull/2829
>
> Removes a few `rb_funcall` calls from source file reading and the AST
> loader.
>
> * `rb_ast_parse_file`: removes 1 x `rb_funcall`, removes 1 transient
> string allocation (`"-"`)
> * `load_file_internal`: removes 3 x `rb_funcall`, removes 1 transient
> string allocation (`"-"`)
> * Removes a branch from `rb_io_set_encoding` which checks for a T_FILE
> type which I could not take with ruby tests or Rails (asserted with an
> inline `rb_bug` for backtrace :smile: ). I declare it dead
> * Removes static symbol `id_set_encoding` from `io.c`
> * Introduces a literal fstring `str_no_transcoding` to represent the no
> transcoding option `"-"`
>
> Now ... I don't think I like the API naming convention of
> `rb_io_set_encoding_internal` very much for the following reason: with
> `internal` it means not public API (but then again declaring it in
> `ruby/io.h` implies that too, but can also be interpreted as `internal
> encoding`, which can be confusing.
>
> Open to ideas about the API and also the special `Qfalse` argument which
> assigns the no transcoding special case.
>
> Master booting Redmine with Rails 6:
>
> ```
> [RUBY_DEBUG_COUNTER]    obj_newobj                             2095742
> [RUBY_DEBUG_COUNTER]    frame_push_cfunc                       2217390
> ```
>
> This PR:
>
> ```
> [RUBY_DEBUG_COUNTER]    obj_newobj                             2093369
> [RUBY_DEBUG_COUNTER]    frame_push_cfunc                       2212686
> ```
>
> Diffs:
>
> * `4704` less C function calls (my understanding is `rb_call` and friends
> would bump `frame_push_cfunc`)
> * `2373` less transient objects allocated (about half of the dispatch
> calls also allocated a "-" string)
>
> Which is about inline with the loaded features for booting the process:
>
> ```
> irb(main):002:0> $LOADED_FEATURES.size
> =3D> 2165
> ```
>
>
>
> --
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