mirror of
https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandChandler Carruth
49c7288619
- A function with a return declaration always has exactly one `ReturnSlotPattern`, representing the whole return declaration (whereas previously that was omitted for value and reference returns). - The `ReturnSlotPattern` always has a subpattern with the same form. `OutParamPattern` already plays that role for initializing forms, and `TuplePattern` will play that role for tuple forms. This change introduces `ValueReturnPattern` and `RefReturnPattern` to represent value and reference return forms. - As before, the `ReturnSlotPattern` has a corresponding `ReturnSlot` that represents the output that is initialized by a `return` statement. Its structure parallels the structure of the `ReturnSlotPattern`, so we need `ValueReturn` and `RefReturn` insts that correspond to `ValueReturnPattern` and `RefReturnPattern`. This is a step toward supporting generic return forms, where the `ReturnSlotPattern`'s subpattern may be an action: this change ensures that evaluating the action for a specific form produces the same SemIR as if the form were concrete to begin with. More speculatively, this should simplify the implementation of `return` statements with compound return forms. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
63 lines
2.0 KiB
C++
63 lines
2.0 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_NAME_COMPONENT_H_
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#define CARBON_TOOLCHAIN_CHECK_NAME_COMPONENT_H_
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#include "toolchain/check/node_stack.h"
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#include "toolchain/parse/node_ids.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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class Context;
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// A component in a declaration name, such as `C[T:! type](N:! T)` in
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// `fn C[T:! type](N:! T).F() {}`.
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struct NameComponent {
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// The name of the declaration.
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Parse::NodeId name_loc_id;
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SemIR::NameId name_id;
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// Parse tree bounds for the parameters, including both implicit and explicit
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// parameters. These will be compared to match between declaration and
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// definition.
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Parse::NodeId first_param_node_id;
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Parse::NodeId last_param_node_id;
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// The implicit parameter list.
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Parse::NodeId implicit_params_loc_id;
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SemIR::InstBlockId implicit_param_patterns_id;
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// The explicit parameter list.
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Parse::NodeId params_loc_id;
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SemIR::InstBlockId param_patterns_id;
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// The `Call` parameters of the entity, if it's a function (see the
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// corresponding members of SemIR::FunctionFields and
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// SemIR::EntityWithParamsBase).
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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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// The pattern block.
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SemIR::InstBlockId pattern_block_id;
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};
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// Pops a name component from the node stack (and pattern block stack, if it has
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// parameters).
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auto PopNameComponent(Context& context,
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SemIR::InstId return_pattern_id = SemIR::InstId::None)
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-> NameComponent;
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// Equivalent to PopNameComponent, but also diagnoses if the name component has
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// parameters.
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auto PopNameComponentWithoutParams(Context& context, Lex::TokenKind introducer)
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-> NameComponent;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_NAME_COMPONENT_H_
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