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Implement #4864: Core is a keyword (#4909)

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Change representation of package names from `IdentifierId` to
`PackageNameId`, and add a special value `PackageNameId::Core` for the
Core package. Add a `Core` expression to name the Core package, and
support for parsing the `Core` keyword in `package` and `import`
declarations.

For now, I've made no changes to instruction fingerprinting or name
mangling. This means that fingerprints and mangled names will collide
between names in the `Core` package and names in a `r#Core` package. See
#4908.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Richard Smith
2025-02-11 21:33:57 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 50b3c825e4
commit 8eb4e24cb6
62 changed files with 935 additions and 487 deletions
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toolchain/sem_ir/name.cpp
+8 -6
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@@ -13,18 +13,20 @@ static auto GetSpecialName(NameId name_id, bool for_ir) -> llvm::StringRef {
switch (name_id.index) {
case NameId::None.index:
return for_ir ? "" : "<none>";
case NameId::SelfValue.index:
return "self";
case NameId::SelfType.index:
return "Self";
case NameId::Base.index:
return "base";
case NameId::Core.index:
return "Core";
case NameId::PeriodSelf.index:
return ".Self";
case NameId::ReturnSlot.index:
return for_ir ? "return" : "<return slot>";
case NameId::PackageNamespace.index:
return "package";
case NameId::Base.index:
return "base";
case NameId::SelfType.index:
return "Self";
case NameId::SelfValue.index:
return "self";
case NameId::Vptr.index:
return for_ir ? "vptr" : "<vptr>";
default: