mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Jeremy G. Siek
b784458aef
* parameterized impls, first step * bug fixes, comments, etc. * added another test case, fix a bug in impl lookup * simplify tests, removing tuple stuff * don't create impl bindings for -bound implicit parameters * remove a redundant 'private' * CamelCase * add missing backtick * add a comment
79 lines
2.6 KiB
C++
79 lines
2.6 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 EXECUTABLE_SEMANTICS_AST_GENERIC_BINDING_H_
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#define EXECUTABLE_SEMANTICS_AST_GENERIC_BINDING_H_
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#include <map>
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#include "common/check.h"
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#include "common/ostream.h"
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#include "executable_semantics/ast/ast_node.h"
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#include "executable_semantics/ast/pattern.h"
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#include "executable_semantics/ast/value_category.h"
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namespace Carbon {
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class Value;
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class Expression;
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class ImplBinding;
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// `ImplBinding` plays the role of the parameter for passing witness
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// tables to a generic. However, unlike regular parameters
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// (`BindingPattern`) there is no explicit syntax that corresponds to
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// an `ImplBinding`, so they are not created during parsing. Instances
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// of `ImplBinding` are created during type checking, when processing
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// a type parameter (a `GenericBinding`), or an `is` requirement in
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// a `where` clause.
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class ImplBinding : public AstNode {
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public:
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using ImplementsCarbonValueNode = void;
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ImplBinding(SourceLocation source_loc,
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Nonnull<const GenericBinding*> type_var,
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Nonnull<const Value*> iface)
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: AstNode(AstNodeKind::ImplBinding, source_loc),
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type_var_(type_var),
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iface_(iface) {}
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static auto classof(const AstNode* node) -> bool {
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return InheritsFromImplBinding(node->kind());
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}
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void Print(llvm::raw_ostream& out) const override;
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void PrintID(llvm::raw_ostream& out) const override;
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// The binding for the type variable.
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auto type_var() const -> Nonnull<const GenericBinding*> { return type_var_; }
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// The interface being implemented.
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auto interface() const -> Nonnull<const Value*> { return iface_; }
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// Required for the the ValueNode interface
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auto constant_value() const -> std::optional<Nonnull<const Value*>> {
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return std::nullopt;
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}
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auto symbolic_identity() const -> std::optional<Nonnull<const Value*>> {
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return std::nullopt;
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}
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// The static type of the impl. Cannot be called before typechecking.
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auto static_type() const -> const Value& { return **static_type_; }
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// Sets the static type of the impl. Can only be called once, during
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// typechecking.
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void set_static_type(Nonnull<const Value*> type) {
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CHECK(!static_type_.has_value());
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static_type_ = type;
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}
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auto value_category() const -> ValueCategory { return ValueCategory::Let; }
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private:
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Nonnull<const GenericBinding*> type_var_;
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Nonnull<const Value*> iface_;
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std::optional<Nonnull<const Value*>> static_type_;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_AST_GENERIC_BINDING_H_
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