[ruby-core:122388] [Ruby Bug#21330] Namespace: Class and Module frozen status is not namespaced
From:
"byroot (Jean Boussier) via ruby-core" <ruby-core@...>
Date:
2025-06-03 06:30:12 UTC
List:
ruby-core #122388
Issue #21330 has been updated by byroot (Jean Boussier).
> I'm afraid that moving frozen flag into class_ext (and each built-in class variants can has each frozen state) makese OBJ_FROZEN code:
It seems like your sentence is missing a word. Did you mean to say that it will make `OBJ_FROZEN` slower? If so yes, absolutely, but I thought it was a given. Namespaces are introducing a level of indirection it need to be checked and isn't cheap.
But on this note I'm currently working on two patches that may help with that:
- Moving the frozen bit inside the shape_id: https://github.com/ruby/ruby/pull/13289
- Delegating classes variables handling: https://github.com/ruby/ruby/pull/13411
With those two changes, once finished, I believe I can come up with a `RB_OBJ_FROZEN_RAW` that has almost the exact same performance.
> Any usecases?
What Jeremy said, but also just consistency? It's very hard to reason about a feature that isn't behaving consistently.
----------------------------------------
Bug #21330: Namespace: Class and Module frozen status is not namespaced
https://bugs.ruby-lang.org/issues/21330#change-113553
* Author: byroot (Jean Boussier)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
```ruby
File.write("/tmp/test.rb", <<~'RUBY')
Hash.freeze
RUBY
ns = Namespace.new
ns.require("/tmp/test.rb")
class Hash
def monkey_patch
end
end
```
Expected behavior:
Since the monkey patch is in a different namespace, I'd expect it to not impact code that is running in another namespace.
Actual behavior:
```
test.rb:9:in '<class:Hash>': can't modify frozen class: Hash (FrozenError)
```
The class is frozen globally, breaking code in other namespaces.
Is this by design, or does that mean the frozen status need to be moved in the `classext_t` as well?
cc @tagomoris
--
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