mirror of
https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
50263483d8
This required changing BindingPattern::name() to return `"_"` instead of nullopt when representing a `"_"` binding. Semi-related drive-by fixes: - Update BindingPlaceholderValue to expose a NamedEntity instead of a string name, and stop exposing its type. - Drop the unused SourceLocation parameter of ValueEqual
71 lines
2.1 KiB
C++
71 lines
2.1 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_MEMBER_H_
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#define EXECUTABLE_SEMANTICS_AST_MEMBER_H_
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#include <string>
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#include "common/ostream.h"
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#include "executable_semantics/ast/expression.h"
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#include "executable_semantics/ast/pattern.h"
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#include "executable_semantics/ast/source_location.h"
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#include "llvm/Support/Compiler.h"
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namespace Carbon {
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// Abstract base class of all AST nodes representing patterns.
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//
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// Member and its derived classes support LLVM-style RTTI, including
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// llvm::isa, llvm::cast, and llvm::dyn_cast. To support this, every
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// class derived from Member must provide a `classof` operation, and
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// every concrete derived class must have a corresponding enumerator
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// in `Kind`; see https://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html for
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// details.
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class Member : public AstNode {
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public:
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~Member() override = 0;
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Member(const Member&) = delete;
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auto operator=(const Member&) -> Member& = delete;
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void Print(llvm::raw_ostream& out) const override;
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static auto classof(const AstNode* node) -> bool {
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return InheritsFromMember(node->kind());
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}
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// Returns the enumerator corresponding to the most-derived type of this
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// object.
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auto kind() const -> MemberKind {
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return static_cast<MemberKind>(root_kind());
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}
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protected:
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Member(AstNodeKind kind, SourceLocation source_loc)
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: AstNode(kind, source_loc) {}
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};
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class FieldMember : public Member {
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public:
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FieldMember(SourceLocation source_loc, Nonnull<BindingPattern*> binding)
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: Member(AstNodeKind::FieldMember, source_loc), binding_(binding) {
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CHECK(binding->name() != AnonymousName);
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}
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static auto classof(const AstNode* node) -> bool {
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return InheritsFromFieldMember(node->kind());
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}
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auto binding() const -> const BindingPattern& { return *binding_; }
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auto binding() -> BindingPattern& { return *binding_; }
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private:
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Nonnull<BindingPattern*> binding_;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_AST_MEMBER_H_
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