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Richard SmithandJon Ross-Perkins
abf23ae7fe
Add an instruction to hold the witness table, along with a corresponding
type to keep things simpler. Add `check/impl.{h,cpp}` to house the new
logic. No checking of impls against interfaces is performed yet.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
38 lines
1.1 KiB
C++
38 lines
1.1 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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#include "toolchain/check/impl.h"
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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/impl.h"
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namespace Carbon::Check {
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auto BuildImplWitness(Context& context, SemIR::ImplId impl_id)
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-> SemIR::InstId {
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auto& impl = context.impls().Get(impl_id);
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CARBON_CHECK(impl.is_being_defined());
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// TODO: Handle non-interface constraints.
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auto interface_type =
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context.types().TryGetAs<SemIR::InterfaceType>(impl.constraint_id);
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if (!interface_type) {
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context.TODO(context.insts().GetParseNode(impl.definition_id),
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"impl as non-interface");
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return SemIR::InstId::BuiltinError;
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}
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auto interface_id = interface_type->interface_id;
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// TODO: Form the witness table.
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auto table_id = context.inst_blocks().Add({});
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return context.AddInst(SemIR::InterfaceWitness{
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context.GetBuiltinType(SemIR::BuiltinKind::WitnessType), interface_id,
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table_id});
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}
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} // namespace Carbon::Check
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