[ruby-core:121109] [Ruby master Feature#21140] Add a method to get the address of certain JIT related functions

Issue #21140 has been updated by maximecb (Maxime Chevalier-Boisvert).


> We would fix them forward. That's why we have our daily Ruby-head CI running, so that we can catch these kinds of changes as early as possible and fix any code that needs changing.

You would't know about the gems that might break until someone actually merges the change into CRuby. At this point, you would be forced to delay deploying new versions of CRuby to Core/SFR until the gem issues are fixed. This would mean either changing our code to not use the broken gem (unknown time / difficulty), or trying to fork the gem or get the author to fix it (unknown time / difficulty). Either way, it's another small crisis that we need to handle and we potentially waste a significant amount of time on.

> I think that would result in RJIT and any other experimental JIT related project being completely irrelevant and kill any kind of experimentation on the platform.

No it wouldn't. YJIT was guarded by a configure option at the beginning. Building a custom Ruby is not that difficult for people to do. If you want a slightly less difficult option, then I would say make it a command-line flag. Still has largely the same benefits but it saves you the building a custom Ruby step.

> Ruby has always been a language of folks running with scissors, and I don't think we should stop doing that now.

So people have made bad decisions in the past, and there have been negative consequences, eg broken Ractors negatively impacting Ruby's credibility as a viable  language... But we should keep making bad decisions with predictable outcomes because there is a precedent for doing so?

----------------------------------------
Feature #21140: Add a method to get the address of certain JIT related functions
https://bugs.ruby-lang.org/issues/21140#change-112029

* 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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