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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
5f888e1124
Add a full entity representation for associated constants, and build a `Generic` object for them. This `Generic` is parameterized by the enclosing `Self` type, allowing the use of `Self` within the type of the associated constant to be supported. When performing impl lookup for an associated constant, produce the type with the provided self type substituted for its `Self` along with any generic parameters of the interface. Split the handling of associated constant declarations into two parts, corresponding to the code before the `=`, and the code between the `=` and `;` (if any). The former goes into the generic declaration region; the latter into the generic definition region. This prepares us to handle the default value for an associated constant, but for now we're just storing the information and not actually using it. Remove the entity type field from `assoc_entity_type`, because it's almost unused and is an attractive nuisance -- it must necessarily be a type in the generic scope of the associated constant rather than in the scope of the instruction (because there is no `Self` anywhere else), which means that it's hard to substitute into or derive meaning from. See `toolchain/check/testdata/impl/assoc_const_self.carbon` for tests of the new functionality; these used to cause the toolchain to crash.
39 lines
1.7 KiB
C++
39 lines
1.7 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_INTERFACE_H_
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#define CARBON_TOOLCHAIN_CHECK_INTERFACE_H_
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#include "toolchain/check/context.h"
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#include "toolchain/sem_ir/ids.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 an enclosing generic, plus a type to use as `Self`.
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auto GetSelfSpecificForInterfaceMemberWithSelfType(
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Context& context, SemIRLoc loc, SemIR::SpecificId enclosing_specific_id,
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SemIR::GenericId generic_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, SemIRLoc loc,
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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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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_INTERFACE_H_
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