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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/parse/testdata/packages/import/cpp_inline.carbon
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+6 -6
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@@ -76,17 +76,17 @@ int n;
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: ';', has_error: yes},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: 'library', has_error: yes},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'LibraryName', text: '"foo.h"'},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 5},
@@ -100,7 +100,7 @@ int n;
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: '', has_error: yes},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: 'inline', has_error: yes, subtree_size: 5},
@@ -136,12 +136,12 @@ int n;
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: '"int m;"'},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: ''''
// CHECK:STDOUT: // C++ comment.
// CHECK:STDOUT: int n;