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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandRichard Smith
47e9d62fd5
This makes the thunk-call logic more general and more supportable by reusing the existing pattern-matching logic. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
87 lines
4.0 KiB
C++
87 lines
4.0 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/function.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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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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// Return type for CalleePatternMatch.
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struct CalleePatternMatchResults {
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SemIR::InstBlockId call_param_patterns_id;
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SemIR::InstBlockId call_params_id;
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SemIR::Function::CallParamIndexRanges param_ranges;
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};
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// Emits the pattern-match IR for the declaration of a parameterized entity with
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// the given implicit and explicit parameter patterns, and the given return
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// patterns (any of which may be `None` if not applicable). This IR performs the
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// callee side of pattern matching, starting at the `ParamPattern` insts, and
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// matching them against the corresponding `Call` parameters (see
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// entity_with_params_base.h for the definition of that term).
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// Returns the IDs of inst blocks consisting of references to the `Call`
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// parameter patterns and `Call` parameters of the function, as well as
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// the implicit, explicit, and return index ranges of those blocks.
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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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SemIR::InstBlockId return_patterns_id)
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-> CalleePatternMatchResults;
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// Return type for ThunkPatternMatch.
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struct ThunkPatternMatchResults {
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// The syntactic argument list. If `self_pattern_id` is not `None`, the first
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// element will be the corresponding argument.
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llvm::SmallVector<SemIR::InstId> syntactic_args;
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// The trailing elements of `outer_call_args` that were not used in
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// `syntactic_args`. These presumably represent the output arguments for the
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// return.
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llvm::ArrayRef<SemIR::InstId> ignored_call_args;
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};
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// Given the `Call` arguments for the outer part of a thunked function call,
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// computes the corresponding syntactic argument list, suitable for passing to
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// the inner part of the thunked function call.
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auto ThunkPatternMatch(Context& context, SemIR::InstId self_pattern_id,
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SemIR::InstBlockId param_patterns_id,
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llvm::ArrayRef<SemIR::InstId> outer_call_args)
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-> ThunkPatternMatchResults;
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// Emits the pattern-match IR for matching the given arguments with the given
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// parameter patterns, and returns an inst block of the arguments that should
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// be passed to the `Call` inst. `is_operator_syntax` indicates that this call
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// was generated from an operator rather than from function call syntax, so
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// arguments to `ref` parameters aren't required to have `ref` tags.
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auto CallerPatternMatch(Context& context, SemIR::SpecificId specific_id,
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SemIR::InstId self_pattern_id,
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SemIR::InstBlockId param_patterns_id,
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SemIR::InstBlockId return_patterns_id,
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SemIR::InstId self_arg_id,
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llvm::ArrayRef<SemIR::InstId> arg_refs,
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llvm::ArrayRef<SemIR::InstId> return_arg_ids,
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bool is_operator_syntax) -> SemIR::InstBlockId;
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// Emits the pattern-match IR for a local pattern matching operation with the
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// given pattern and scrutinee.
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auto LocalPatternMatch(Context& context, SemIR::InstId pattern_id,
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SemIR::InstId scrutinee_id) -> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_PATTERN_MATCH_H_
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