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Clean up singleton TypeId use (#6300)

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#6289 absentmindedly added fields in more places, and this is undoing
that plus further fixes.

This does some cleanup of types with relation to singletons. For
`TypeType` and `ErrorInst`, they're always complete due to a
`SetComplete` call in `file.cpp`. For `CppVoidType`, it's intended to be
incomplete by construction, and so a `TypeId` should be okay. The intent
though on not generally providing these had been that `GetSingletonType`
needs to be called to get a type to be marked as complete.

In the case of `AutoType`, removing `TypeId`does change a small printing
detail. I think that's old legacy that's just been carried forward.

Otherwise, for both `InstType` and `AutoType`, I've added
`GetSingletonType` calls where they were used in order to ensure
completeness is applied correctly. These calls cause small SemIR
permutations.

This causes `AutoType` to be seen by lowering, so I'm adding a
placeholder for it. Also merging two functions that look like they're
identical in intent -- not sure why they're separate.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
This commit is contained in:
Jon Ross-Perkins
2025-10-30 22:50:59 +00:00
committed by GitHub
co-authored by Dana Jansens
parent f272198ce5
commit 42e2280150
47 changed files with 215 additions and 210 deletions
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toolchain/check/testdata/interop/cpp/function/extern_c.carbon
Vendored
+1 -1
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@@ -205,8 +205,8 @@ fn MyF(a: Cpp.X, b: Cpp.X) -> Cpp.X {
// CHECK:STDOUT: --- extern_c_with_special_name.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %ptr.1f9: type = ptr_type %X [concrete]
// CHECK:STDOUT: %operator+__carbon_thunk.type: type = fn_type @operator+__carbon_thunk [concrete]
// CHECK:STDOUT: %operator+__carbon_thunk: %operator+__carbon_thunk.type = struct_value () [concrete]