mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-03 22:02:51 +01:00
Dana Jansens
32aa7cb1fa
Identifying a facet type takes both a self and facet type as a pair, and then encode the self into the IdentifiedFacetType. This makes a constraint that requires some _other_ type implements an interface visible in the IdentifiedFacetType. And it will help to enable facet types with `where T impls Z` for `T` that is not `.Self` in the future. IdentifiedFacetTypes are now stored in a CanonicalValueStore instead of a RelationalValueStore as they key is the combination of self and (declared) facet type together now. When the self-type is a facet value (has type FacetType) this is most straightforward. But when it's a type we need to construct a FacetValue to construct a specific for a require decl, to replace the generic binding of the symbolic `Self`, which has type FacetType. To do so, we make a FacetValue with an empty FacetType (equivalent to TypeType). This prevents any looking for witnesses through the FacetType, which matches what you can get from a type directly, requiring witnesses to come from finding an `impl` decl. Add additional InstNamer logic for such empty facet types so they print as `<typename>.type.facet` if possible instead of as just `facet_value`.
67 lines
3.1 KiB
C++
67 lines
3.1 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_INTERFACE_H_
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#define CARBON_TOOLCHAIN_CHECK_INTERFACE_H_
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#include <optional>
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#include "toolchain/check/context.h"
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#include "toolchain/check/decl_name_stack.h"
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#include "toolchain/check/name_component.h"
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#include "toolchain/parse/node_ids.h"
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#include "toolchain/sem_ir/entity_with_params_base.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/name_scope.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::Check {
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// Builds and returns an associated entity for `interface_id` corresponding to
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// the declaration `decl_id`, which can be an associated function or an
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// associated constant. Registers the associated entity in the list for the
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// interface.
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auto BuildAssociatedEntity(Context& context, SemIR::InterfaceId interface_id,
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SemIR::InstId decl_id) -> SemIR::InstId;
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// Gets the self specific of a generic declaration that is an interface member,
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// given a specific for the interface plus a type to use as `Self`.
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auto GetSelfSpecificForInterfaceMemberWithSelfType(
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Context& context, SemIR::LocId loc_id,
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SemIR::SpecificId interface_specific_id, SemIR::GenericId generic_id,
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SemIR::SpecificId enclosing_specific_id, SemIR::TypeId self_type_id,
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SemIR::InstId witness_inst_id) -> SemIR::SpecificId;
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// Gets the type of the specified associated entity, given the specific for the
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// interface and the type of `Self`.
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auto GetTypeForSpecificAssociatedEntity(Context& context, SemIR::LocId loc_id,
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SemIR::SpecificId interface_specific_id,
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SemIR::InstId decl_id,
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SemIR::TypeId self_type_id,
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SemIR::InstId self_witness_id)
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-> SemIR::TypeId;
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// Creates a symbolic binding for `Self` of type `type_id` in the scope of
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// `scope_id`, and add the name `Self` for the compile time binding.
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//
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// Returns the symbolic binding instruction.
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auto AddSelfGenericParameter(Context& context, SemIR::LocId definition_loc_id,
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SemIR::TypeId type_id, SemIR::NameScopeId scope_id,
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bool is_template) -> SemIR::InstId;
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// Given a search result `lookup_result` for `name`, returns the previous valid
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// declaration of `name` if there is one. The `entity` is a new decl of the same
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// `name`, and the existing decl need to be of the same entity type. Otherwise,
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// produces diagnostics if needed and returns nullopt.
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template <typename EntityT>
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requires SameAsOneOf<EntityT, SemIR::Interface, SemIR::NamedConstraint>
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auto TryGetExistingDecl(Context& context, const NameComponent& name,
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SemIR::ScopeLookupResult lookup_result,
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const EntityT& entity, bool is_definition)
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-> std::optional<SemIR::Inst>;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_INTERFACE_H_
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