[pull] master from ruby:master#390
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pull[bot] merged 10 commits intoturkdevops:masterfrom Oct 23, 2025
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Shopify#649 Class vars are a bit more involved than ivars, since we need to get the class from the cref, so this calls out to `rb_vm_getclassvariable` and `rb_vm_setclassvariable` like YJIT.
* `RB_OBJ_SET_SHAREABLE(obj)` makes obj shareable. All of reachable objects from `obj` should be shareable. * `RB_OBJ_SET_FROZEN_SHAREABLE(obj)` same as above but freeze `obj` before making it shareable. Also `rb_gc_verify_shareable(obj)` is introduced to check the `obj` does not violate shareable rule (an shareable object only refers shareable objects) strictly. The rule has some exceptions (some shareable objects can refer to unshareable objects, such as a Ractor object (which is a shareable object) can refer to the Ractor local objects. To handle such case, `check_shareable` flag is also introduced. `STRICT_VERIFY_SHAREABLE` macro is also introduced to verify the strict shareable rule at `SET_SHAREABLE`.
to adopt strict shareable rule. * (basically) shareable objects only refer shareable objects * (exception) shareable objects can refere unshareable objects but should not leak reference to unshareable objects to Ruby world
because ISeq is shareable now.
They should be checked, but not sure JIT code...
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