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75 lines
2.4 KiB
C++
75 lines
2.4 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 {
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public:
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enum class Kind { FieldMember };
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Member(const Member&) = delete;
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Member& operator=(const Member&) = delete;
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void Print(llvm::raw_ostream& out) const;
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LLVM_DUMP_METHOD void Dump() const { Print(llvm::errs()); }
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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 -> Kind { return kind_; }
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auto source_loc() const -> SourceLocation { return source_loc_; }
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protected:
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// Constructs a Member representing syntax at the given line number.
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// `kind` must be the enumerator corresponding to the most-derived type being
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// constructed.
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Member(Kind kind, SourceLocation source_loc)
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: kind_(kind), source_loc_(source_loc) {}
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private:
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const Kind kind_;
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SourceLocation 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<const BindingPattern*> binding)
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: Member(Kind::FieldMember, source_loc), binding_(binding) {}
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static auto classof(const Member* member) -> bool {
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return member->kind() == Kind::FieldMember;
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}
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auto binding() const -> const BindingPattern& { return *binding_; }
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private:
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// TODO: split this into a non-optional name and a type, initialized by
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// a constructor that takes a BindingPattern and handles errors like a
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// missing name.
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Nonnull<const 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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