ObjectLayoutVariant

The set of all fields present in this variant. This includes not just the real fields that can hold multiple potential values, but also the fields that were created solely for the purpose of explicit subclassing.

The mapping from field atoms to slots. The fields that are created just for making explicit subclasses all map to 0, which is not a valid slot.

The immutable object descriptor for this variant.

The immutable object type descriptor for this variant.

The instanceMeta of the most general object type using this variant.

The most general object type using this variant.

The mutable object descriptor for this variant.

The mutable object type descriptor for this variant.

The number of slots to allocate in an object or object type to accommodate the real fields. This excludes the keys that were created solely for the purpose of explicit subclassing. This value is always the largest value in fieldToSlotIndex.

The List of A_Atoms for which to allocate slots in an object or object type. This only includes the real fields, and excludes the keys that were created solely for the purpose of explicit subclassing. These slots are in the same order that the slots should have in the object or object type.

The shared object descriptor for this variant.

The shared object type descriptor for this variant.

A unique int suitable for distinguishing variants. This may become more useful when Level Two code needs to track metrics and create variant specific versions of code without garbage collection complexity. It's allocated from the variantsCounter while holding the variantsLock.

Check whether an object type based on the receiver could be a subtype of a type based on another, based only on the fields present in each.