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carbon-lang/toolchain
Dana Jansens d199ce327a Make FacetTypeInfo and CompleteFacetType stores share id indices (#4989)
The CompleteFacetType value store is now a RelationalValueStore. This
type of store uses some _other_ id as the key for insertion. It allows
checking if values of the _other_ id are present in the store, since
those ids are handed out by another store and will (necessarily) exist
before there is a matching value in the RelationalValueStore.

The lookup for precense of the _other_ id returns the id of a value in
the RelationalValueStore. That id can be used to get the value out of
the store.

For our use case, the RelationalValueStore maps from FacetTypeId to
CompleteFacetTypeId. So you add a CompleteFacetType to the store with a
FacetTypeId. Then you can query with a FacetTypeId to see if there
exists a CompleteFacetTypeId. And if there is, you can use that
CompleteFacetTypeId thereafter to get the CompleteFacetType value from
the store.

This removes the need for ValueStore::GetMutable() and removes the
method. FacetTypeInfo no longer has a field that needs to be carefully
excluded from hash and comparison.
2025-02-20 22:59:06 +00:00
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