Issue #18059 has been updated by Dan0042 (Daniel DeLorme).


shyouhei (Shyouhei Urabe) wrote in #note-1:
> The "USER" terminology never seriously meant anything I guess.

I thought it meant those flags have a different usage for each class. No?

Actually I have so many questions about flags, like why are they limited to 32 even though the `flags` field is a 64-bit value (instead of wasting 32 bits, why not use either 32 _or_ 64 bits on all architectures?) It would be nice if there was some documentation somewhere about flags and how they are used. Even just comments in the code. I haven't found much so far.

----------------------------------------
Misc #18059: Which FL_USERx are open to extension libraries?
https://bugs.ruby-lang.org/issues/18059#change-93102

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
----------------------------------------
Often the following failure occurs in `test-spec`.

```
RBasic support for regular objects supports copying the flags from one object over to the other FAILED
Expected 81920 == 33636352
to be truthy but was false
/tmp/ruby/v3/src/trunk/spec/ruby/optional/capi/shared/rbasic.rb:71:in `block (2 levels) in <top (required)>'
/tmp/ruby/v3/src/trunk/spec/ruby/optional/capi/rbasic_spec.rb:8:in `<top (required)>'
```

`81920    ==   0x14000`
`33636352 == 0x2014000`
The difference `0x2000000` is `FL_USER13`, which is used as `ROBJECT_TRANSIENT_FLAG`.
This flag is set when any `Object` instance has some amount of instance variables.

In this particular case, it is possible to fix just by excluding the bit.
But, the question is which flags are open to extension libraries.

My guess is these flags are available for `T_DATA` classes, but not for `T_OBJECT`.
Any thoughts?



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