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Initial scaffolding for building a witness table for an impl. (#3743)

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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>
This commit is contained in:
Richard Smith
2024-03-07 23:10:14 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 2424ea16ea
commit abf23ae7fe
27 changed files with 216 additions and 29 deletions
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toolchain/check/impl.cpp
+37
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "toolchain/check/impl.h"
#include "toolchain/check/context.h"
#include "toolchain/sem_ir/ids.h"
#include "toolchain/sem_ir/impl.h"
namespace Carbon::Check {
auto BuildImplWitness(Context& context, SemIR::ImplId impl_id)
-> SemIR::InstId {
auto& impl = context.impls().Get(impl_id);
CARBON_CHECK(impl.is_being_defined());
// TODO: Handle non-interface constraints.
auto interface_type =
context.types().TryGetAs<SemIR::InterfaceType>(impl.constraint_id);
if (!interface_type) {
context.TODO(context.insts().GetParseNode(impl.definition_id),
"impl as non-interface");
return SemIR::InstId::BuiltinError;
}
auto interface_id = interface_type->interface_id;
// TODO: Form the witness table.
auto table_id = context.inst_blocks().Add({});
return context.AddInst(SemIR::InterfaceWitness{
context.GetBuiltinType(SemIR::BuiltinKind::WitnessType), interface_id,
table_id});
}
} // namespace Carbon::Check