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Reclaim one VALUE from rb_classext_t by shrinking super_classdepth

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By making `super_classdepth` `uint16_t`, classes and modules can
now fit in 160B slots again.

The downside of course is that before `super_classdepth` was large
enough we never had to care about overflow, as you couldn't
realistically create enough classes to ever go over it.

With this change, while it is stupid, you could realistically
create an ancestor chain containing 65k classes and modules.
This commit is contained in:
Jean Boussier 2025-05-13 16:27:43 +02:00
parent f855bcc6b2
commit 130d6aaef2
Notes: git 2025-05-14 08:17:16 +00:00
2 changed files with 11 additions and 4 deletions
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4
class.c
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@ -827,7 +827,9 @@ rb_class_update_superclasses(VALUE klass)
superclasses = class_superclasses_including_self(super);
RCLASS_WRITE_SUPERCLASSES(super, super_depth, superclasses, true, true);
}
RCLASS_WRITE_SUPERCLASSES(klass, super_depth + 1, superclasses, false, false);
size_t depth = super_depth == RCLASS_MAX_SUPERCLASS_DEPTH ? super_depth : super_depth + 1;
RCLASS_WRITE_SUPERCLASSES(klass, depth, superclasses, false, false);
}
void