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Geoff RomerandJon Ross-Perkins
9d942f4633
Also propagate the pattern IR along with the pattern-match IR, and use it where appropriate. Strictly speaking, some parts of the pattern-match IR are allocated eagerly, while traversing the pattern's parse tree, but they still aren't actually emitted until we traverse the associated pattern insts. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
55 lines
2.2 KiB
C++
55 lines
2.2 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_PATTERN_MATCH_H_
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#define CARBON_TOOLCHAIN_CHECK_PATTERN_MATCH_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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struct ParameterBlocks {
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// The implicit parameter list.
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SemIR::InstBlockId implicit_params_id;
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// The explicit parameter list.
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SemIR::InstBlockId params_id;
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};
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// TODO: Find a better place for this overview, once it has stabilized.
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//
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// The signature pattern of a function call is matched partially by the caller
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// and partially by the callee. `ParamPattern` insts mark the boundary
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// between the two: pattern insts that are descendants of a `ParamPattern`
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// are matched by the callee, and pattern insts that have a `ParamPattern`
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// as a descendant are matched by the caller.
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//
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// "Calling convention arguments" are the values actually passed from caller to
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// callee at the semantic IR level, and "calling convention parameters" are
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// the corresponding semantic placeholders that they bind to.
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// Emits the pattern-match IR for the declaration of a function with the
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// given implicit and explicit parameter patterns. This IR performs the callee
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// side of pattern matching, starting at the `ParamPattern` insts, and matching
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// them against the corresponding calling-convention parameters.
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auto CalleePatternMatch(Context& context,
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SemIR::InstBlockId implicit_param_patterns_id,
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SemIR::InstBlockId param_patterns_id)
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-> ParameterBlocks;
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// Emits the pattern-match IR for matching the given argument with the given
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// parameter pattern, and returns the inst representing the resulting
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// calling-convention argument. This IR performs the caller side of pattern
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// matching that argument.
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//
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// TODO: restructure to have this handle the entire signature.
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auto CallerPatternMatch(Context& context, SemIR::SpecificId specific_id,
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SemIR::InstId param, SemIR::InstId arg)
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-> SemIR::InstId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_PATTERN_MATCH_H_
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