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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:10:12 +01:00
Dana Jansens
2d38978756
We encode the state of looking that the parent scope is a Class into a type so that we can avoid extra lookups. Then use that in refactoring where diagnostics are generated for an explicit `Self` in an `extend impl` declaration. We add tests that we don't double-diagnose the Self type when it's already an error, and make the behaviour of `extend require` match that of `extend impl as`. This avoids some fragile/complex parse-node lookups (such as `context.parse_tree_and_subtrees().ExtractAs<Parse::ImplTypeAs>`) by using the parse node at the point where we are handling it instead of much later. This is part of #6420 which is being split up into a chain of smaller PRs.
29 lines
818 B
C++
29 lines
818 B
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_CHECK_NAME_SCOPE_H_
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#define CARBON_TOOLCHAIN_CHECK_NAME_SCOPE_H_
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#include <optional>
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#include "toolchain/check/context.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::Check {
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struct ClassScope {
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SemIR::ClassDecl class_decl;
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SemIR::NameScope* name_scope;
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};
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// If the specified name scope corresponds to a class, returns the corresponding
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// class declaration.
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auto TryAsClassScope(Context& context, SemIR::NameScopeId scope_id)
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-> std::optional<ClassScope>;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_NAME_SCOPE_H_
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