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Add a general substitution mechanism to support substituting symbolic bindings with their values throughout symbolic constants and, more specifically, types. This is done by decomposing the constant instruction into its operands, substituting into the operands, and then rebuilding the constant value by invoking the constant evaluator. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com> Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
36 lines
1.3 KiB
C++
36 lines
1.3 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_SUBST_H_
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#define CARBON_TOOLCHAIN_CHECK_SUBST_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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// A substitution that is being performed.
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struct Substitution {
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// The ID of a `BindSymbolicName` instruction that is being replaced.
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SemIR::InstId bind_id;
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// The replacement constant value to substitute.
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SemIR::ConstantId replacement_id;
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};
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using Substitutions = llvm::ArrayRef<Substitution>;
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// Replaces the `BindSymbolicName` instruction `bind_id` with `replacement_id`
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// throughout the constant `const_id`, and returns the substituted value.
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auto SubstConstant(Context& context, SemIR::ConstantId const_id,
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Substitutions substitutions) -> SemIR::ConstantId;
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// Replaces the `BindSymbolicName` instruction `bind_id` with `replacement_id`
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// throughout the type `type_id`, and returns the substituted value.
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auto SubstType(Context& context, SemIR::TypeId type_id,
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Substitutions substitutions) -> SemIR::TypeId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_SUBST_H_
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