Fix cext support for google-protobuf #3861
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| @@ -2347,6 +2347,10 @@ def rb_eval_cmd_kw(cmd, args, kw_splat) | |||
| end | |||
| end | |||
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| def rb_error_frozen_object(object) | |||
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Could you add a C API spec in exception_spec.c/rb? (to ensure it works as expected and it's not untested code)
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Done in ce849ecd46a75bff2d61f31b358f2bb8cce89d85.
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…`frozen?`. MRI defines `frozen?` with `rb_obj_frozen_p`, which in turn, uses `RB_OBJ_FROZEN`. Since TruffleRuby doesn't have flag bits in an object header like MRI does, we implement `RB_OBJ_FROZEN` with `rb_obj_frozen_p`, which would lead to an infinite loop if a native extension redefined `frozen?` in terms of `RB_OBJ_FROZEN`. We break the loop by introducing a new primitive, which a native extension would not be able to redefine.
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While trying to run the google-protobuf test suite I ran into a couple of problems related to native extensions.
RB_OBJ_FROZENcould lead to infinite recursion. At least one of the Protobuf types definesfrozen?and useRB_OBJ_FROZENto avoid a loop. I resolved that issue by adding a new primitive.rb_error_frozen_object.I didn't add a spec for
rb_error_frozen_object, partially because it wasn't clear where to put it. The function only seems to be called in MRI wheninstance_variable_setis invoked on a special const. Also, I added the function to error.c because that's where it lives in MRI. But, I see we have other functions that we've moved from error.c to exception.c (or, they moved in MRI and we didn't update to match). I don't particularly care where we put it; I can move it if anyone has a strong preference.There may be other compatibility issues to resolve in order to get the gem fully functional. But, it's hard for me to tell due to the crash in #3860.