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Introduce TypeInstId (#5288)

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TypeInstId is an InstId whose constant value has a type of TypeType.
This includes:
- Type value instructions, the `ClassType` or `IntLiteralType`
instructions.
- Constraint value instructions, which are the `FacetType` and
`TypeType` instructions, each of which also have type TypeType.

TypeInstId encodes in the type system that it is safe to convert the
instruction's value to a TypeId, and CHECKs at construction that this
invariant is maintained.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Dana Jansens
2025-04-10 22:59:02 +00:00
committed by GitHub
co-authored by Richard Smith
parent 03a31bd0de
commit cf57c85545
27 changed files with 202 additions and 111 deletions
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toolchain/check/deduce.cpp
+4
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@@ -130,6 +130,10 @@ class DeductionWorklist {
Add(inst_id, SemIR::InstId(arg), needs_substitution);
break;
}
case CARBON_KIND(SemIR::TypeInstId inst_id): {
Add(inst_id, SemIR::InstId(arg), needs_substitution);
break;
}
case CARBON_KIND(SemIR::StructTypeFieldsId fields_id): {
AddAll(fields_id, SemIR::StructTypeFieldsId(arg), needs_substitution);
break;