mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 20:40:11 +01:00
Dana Jansens
917a6ea971
Currently each interface has a `Self` facet internally that becomes a binding to every entity inside the interface: associated constants, functions, and require decls. Each of these has to be independently generic as a result. This makes is challenging in extended name lookup to move into an extended scope of an interface, as we have a specific for the interface, but the names within require a different specific that includes a `Self` facet value. We generalize this relationship by adding a second generic to Interface, called `generic_with_self`. When we want to work with entities inside the interface, we move from the interface-without-specific to the interface-with-self specific by adding a Self to the specific. This is done independently of any particular entity inside the Interface, as those entities are now all members of the interface-with-self generic. Associated constants no longer need a generic of their own, as they do not have separate generic bindings. Functions retain a generic, but if the function has no generic arguments, it will have no bindings of its own now. Require decls retain a generic so that their specific can be instantiated separately from the interface. Requiring the interface to be complete does not require the types in a require decl to be complete unless it is modified by `extend`. So we allow them to be completed later by keeping them in a separate generic. Named constraints look like interfaces and gain the additional inner generic-with-self, with the same relationship to require decls. This removes the need for name lookup to perform Substitution of a Self facet into the extended scope instruction. Instead, the `SpecificConstant` instruction inserted by a `require` decl is part of the interface-with-self generic. When looking through a FacetType for extended scopes, for each interface, we push the scope with the specific for the interface-with-self. Then the constant value of the `SpecificConstant` is correctly modified by the provided self automatically through applying that specific.
64 lines
2.7 KiB
C++
64 lines
2.7 KiB
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_MODIFIERS_H_
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#define CARBON_TOOLCHAIN_CHECK_MODIFIERS_H_
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#include "toolchain/check/context.h"
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namespace Carbon::Check {
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// Reports a diagnostic if access control modifiers on this are not allowed for
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// a declaration in `parent_scope_inst`, and updates `introducer`.
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//
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// `parent_scope_inst` may be nullopt for a declaration in a block scope.
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auto CheckAccessModifiersOnDecl(Context& context,
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DeclIntroducerState& introducer,
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std::optional<SemIR::Inst> parent_scope_inst)
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-> void;
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// Reports a diagnostic if the method function modifiers `abstract`, `virtual`,
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// or `impl` are present but not permitted on a function declaration in
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// `parent_scope_inst`.
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//
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// `parent_scope_inst` may be nullopt for a declaration in a block scope.
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auto CheckMethodModifiersOnFunction(
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Context& context, DeclIntroducerState& introducer,
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SemIR::InstId parent_scope_inst_id,
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std::optional<SemIR::Inst> parent_scope_inst) -> void;
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// Reports a diagnostic (using `decl_kind`) if modifiers on this declaration are
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// not in `allowed`. Updates `introducer`.
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auto LimitModifiersOnDecl(Context& context, DeclIntroducerState& introducer,
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KeywordModifierSet allowed) -> void;
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auto LimitModifiersOnNotDefinition(Context& context,
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DeclIntroducerState& introducer,
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KeywordModifierSet allowed) -> void;
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// Restricts the `extern` modifier to only be used on namespace-scoped
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// declarations. Diagnoses and cleans up:
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// - `extern library` on a definition.
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// - `extern` on a scoped entity.
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//
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// `parent_scope_inst` may be nullopt for a declaration in a block scope.
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auto RestrictExternModifierOnDecl(Context& context,
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DeclIntroducerState& introducer,
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std::optional<SemIR::Inst> parent_scope_inst,
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bool is_definition) -> void;
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// Report a diagonostic if `default` and `final` modifiers are used on
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// declarations where they are not allowed. Right now they are only allowed
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// inside interfaces.
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//
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// `parent_scope_id` may be None for a declaration in a block scope.
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auto RequireDefaultFinalOnlyInInterfaces(Context& context,
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DeclIntroducerState& introducer,
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SemIR::NameScopeId parent_scope_id)
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-> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_MODIFIERS_H_
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