[ruby-core:95316] [Ruby master Feature#16029] Expose fstring related APIs to C-extensions

Issue #16029 has been updated by sam.saffron (Sam Saffron).


I was thinking something like?

```
VALUE
rb_fstring_lookup(char *ptr, rb_encoding *enc)
{
    st_data_t fstring;
    struct RString fake_str;
    setup_fake_str(&fake_str, ptr, len, ENCINDEX_US_ASCII)

    st_table *frozen_strings = rb_vm_fstring_table();

    if (!st_lookup(frozen_strings, (st_data_t)fake_str, &fstring)) {
	return Qnil;
    }

    return ret;
}

```

----------------------------------------
Feature #16029: Expose fstring related APIs to C-extensions
https://bugs.ruby-lang.org/issues/16029#change-82018

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
As discussed with @tenderlove here: https://github.com/ruby/ruby/pull/2287#issuecomment-513865160

We'd like to update various data format parsers (JSON, MessagePack, etc) to add the possibility to deduplicate strings while parsing.

But unfortunately the `rb_fstring_*` family of functions isn't available to C-extensions, so the only available fallback is `rb_funcall(str, rb_intern("-@"))` which most parsers will likely consider too slow. So the various `rb_fstring_*` functions would need to be public.

Proposed patch: https://github.com/ruby/ruby/pull/2299



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