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https://github.com/carbon-language/carbon-lang.git
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Christopher Di Bella
05a7ecbd34
Determining that a type has trivial destruction requires checking whether all of its subobjects have trivial destruction and whether its type has a custom witness for `Destroy.Op`. This isn't possible when `Destroy` is the custodian for `Destroy.Op` and `SubobjectDestroy.Op`, so we need to make `SubobjectDestroy` its own interface. `Destroy.SelfDestruct` becomes a standalone function because it depends on `SubobjectDestroy` and `Destroy` being implemented, and is also responsible for generating any custom witnesses for both interfaces. Making `SelfDestruct` an interface was experimented with, but this required a blanket impl that caused issues for facet types. `Destroy` depends on `SubobjectDestroy` to be implemented. We'd ideally use `require impls SubobjectDestroy`, but it isn't complete yet, and it also causes problems when `Destroy` is implemented inside the class definition. We work around this by temporarily renaming the `Destroy` interface to `DestroyImpl`, and introducing a constraint called `Destroy` so that user code doesn't need to write `Core.SubobjectDestroy & Core.Destroy`.
68 lines
3.0 KiB
C++
68 lines
3.0 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_with_self_specific_id,
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SemIR::GenericId generic_id, SemIR::SpecificId enclosing_specific_id)
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-> 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(
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Context& context, SemIR::SpecificId interface_with_self_specific_id,
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SemIR::InstId decl_id) -> 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`.
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//
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// Returns the symbolic binding instruction.
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auto AddSelfSymbolicBindingToScope(Context& context,
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SemIR::LocId definition_loc_id,
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SemIR::TypeId type_id,
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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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auto GetCoreInterfaceId(Context& context, SemIR::LocId loc_id,
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CoreIdentifier interface_name) -> SemIR::InterfaceId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_INTERFACE_H_
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