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Formalize Cpp as a PackageNameId (#6306)

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This turns `Cpp` into a keyword, and makes it map to `NameId::Cpp` and
`PackageNameId::Cpp`.

Per discussion with zygoloid, the keyword versus identifier question is
deliberately kept open by #4846. This PR switches to a keyword because
mapping to a specific `PackageNameId` works best with a special `NameId`
not backed by an `IdentifierId`. We could in theory make it work using
`IdentifierId` or a runtime-tracked `PackageNameId` for `Cpp` (e.g.
stored on `SemIR::File`), but this approach is consistent with `Core`
and so seemed like a good starting point.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
This commit is contained in:
Jon Ross-Perkins
2025-11-05 17:21:41 +00:00
committed by GitHub
co-authored by Dana Jansens
parent ae50e0f623
commit 8166f9a7cf
22 changed files with 162 additions and 100 deletions
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toolchain/check/testdata/interop/cpp/class/class.carbon
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@@ -553,7 +553,6 @@ fn MyF(bar: Cpp.Bar*);
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Derived
// CHECK:STDOUT: .Cpp = <poisoned>
// CHECK:STDOUT: .base = %.loc8
// CHECK:STDOUT: .foo = <poisoned>
// CHECK:STDOUT: extend %Bar.ref