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68 lines
2.9 KiB
C++
68 lines
2.9 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_H_
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#define CARBON_TOOLCHAIN_CHECK_PATTERN_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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// Marks the start of a region of insts in a pattern context that might
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// represent an expression or a pattern. Typically this is called when
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// handling a parse node that can immediately precede a subpattern (such
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// as `let` or a `,` in a pattern list), and the handler for the subpattern
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// node makes the matching `EndSubpatternAs*` call.
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auto BeginSubpattern(Context& context) -> void;
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// Ends a region started by BeginSubpattern (in stack order), treating it as
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// an expression with the given result, and returns the ID of the region. The
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// region will not yet have any control-flow edges into or out of it.
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auto EndSubpatternAsExpr(Context& context, SemIR::InstId result_id)
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-> SemIR::ExprRegionId;
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// Ends a region started by BeginSubpattern (in stack order), asserting that
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// it had no expression content.
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auto EndSubpatternAsNonExpr(Context& context) -> void;
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// Information about a created binding pattern.
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struct BindingPatternInfo {
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SemIR::InstId pattern_id;
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SemIR::InstId bind_id;
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};
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// TODO: Add EndSubpatternAsPattern, when needed.
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// Creates a binding pattern. Returns the binding pattern and the bind name
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// instruction.
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// TODO: remove is_template once we have a separate InstKind for template
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// bindings.
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auto AddBindingPattern(Context& context, SemIR::LocId name_loc,
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SemIR::NameId name_id, SemIR::TypeId type_id,
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SemIR::ExprRegionId type_region_id,
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SemIR::InstKind pattern_kind, bool is_template)
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-> BindingPatternInfo;
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// Creates storage for `var` patterns nested within the given pattern at the
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// current location in the output SemIR. For a `returned var`, this
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// reuses the function's return slot when present.
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auto AddPatternVarStorage(Context& context, SemIR::InstBlockId pattern_block_id,
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bool is_returned_var) -> void;
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// Adds a parameter pattern with the specified name and type information. The
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// pattern emulates `x: T` or `ref x: T` depending on the value of
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// `is_ref` (`var x: T` is not supported). This only sets up the parameter
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// pattern, binding pattern and type; callers are expected to add the returned
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// parameter pattern instruction to appropriate blocks. This is used when
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// generating functions, rather than processing a user-authored declaration.
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auto AddParamPattern(Context& context, SemIR::LocId loc_id,
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SemIR::NameId name_id,
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SemIR::ExprRegionId type_expr_region_id,
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SemIR::TypeId type_id, bool is_ref) -> SemIR::InstId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_PATTERN_H_
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