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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/cpp_namespace.carbon
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+19 -23
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@@ -18,25 +18,32 @@ library "[[@TEST_NAME]]";
import Cpp library "header.h";
// CHECK:STDERR: fail_duplicate_cpp_name.carbon:[[@LINE+7]]:11: error: duplicate name `Cpp` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: fail_duplicate_cpp_name.carbon:[[@LINE+8]]:11: error: `namespace` introducer should be followed by a name [ExpectedDeclName]
// CHECK:STDERR: namespace Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_duplicate_cpp_name.carbon:[[@LINE+4]]:11: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: namespace Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR: fail_duplicate_cpp_name.carbon:[[@LINE-5]]:1: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: import Cpp library "header.h";
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
namespace Cpp;
// --- cpp_in_inner_namespace.carbon
// --- fail_cpp_in_inner_namespace.carbon
library "[[@TEST_NAME]]";
import Cpp library "header.h";
//@dump-sem-ir-begin
namespace N;
// CHECK:STDERR: fail_cpp_in_inner_namespace.carbon:[[@LINE+8]]:13: error: `.` should be followed by a name [ExpectedDeclNameAfterPeriod]
// CHECK:STDERR: namespace N.Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_cpp_in_inner_namespace.carbon:[[@LINE+4]]:13: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: namespace N.Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
namespace N.Cpp;
//@dump-sem-ir-end
// --- alias.carbon
@@ -54,12 +61,13 @@ library "[[@TEST_NAME]]";
import Cpp library "header.h";
// CHECK:STDERR: fail_add_name_to_cpp_namespace.carbon:[[@LINE+7]]:7: error: imported packages cannot be used for declarations [QualifiedDeclOutsidePackage]
// CHECK:STDERR: fail_add_name_to_cpp_namespace.carbon:[[@LINE+8]]:7: error: `class` introducer should be followed by a name [ExpectedDeclName]
// CHECK:STDERR: class Cpp.C {};
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_add_name_to_cpp_namespace.carbon:[[@LINE+4]]:7: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: class Cpp.C {};
// CHECK:STDERR: ^~~
// CHECK:STDERR: fail_add_name_to_cpp_namespace.carbon:[[@LINE-5]]:1: note: package imported here [QualifiedDeclOutsidePackageSource]
// CHECK:STDERR: import Cpp library "header.h";
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
class Cpp.C {};
@@ -98,18 +106,6 @@ fn F() {
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- cpp_in_inner_namespace.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %N: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Cpp = %Cpp
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp: <namespace> = namespace [concrete] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {