Identifier.h

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//===-- Identifier.h --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLDB_SOURCE_PLUGINS_TYPESYSTEM_CLIKE_IDENTIFIER_H
#define LLDB_SOURCE_PLUGINS_TYPESYSTEM_CLIKE_IDENTIFIER_H
 
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
 
#include <vector>
 
namespace lldb_private {
namespace clike {
 
class IdentifierMap;
 
/// Represents a name in TypeSystemClike.
class Identifier {
public:
  Identifier() = default;
 
  llvm::StringRef GetName() const { return m_name; }
 
private:
  // Only IdentifierMap may build a non-empty Identifier.
  friend class IdentifierMap;
  explicit Identifier(llvm::StringRef name) : m_name(name) {}
 
  llvm::StringRef m_name;
};
 
/// Turns strings into unique Identifier objects.
class IdentifierMap {
public:
  ~IdentifierMap();
 
  /// Returns an Identifier for \p name.
  ///
  /// This copies the string into storage owned by this map.
  Identifier get(llvm::StringRef name);
 
  /// Returns an Identifier for \p name.
  ///
  /// This does not make a copy of the passed string and the string storage
  /// needs to outlive this IdentifierMap. This is used if `name` is a string
  /// literal or backed by ConstString.
  Identifier getWithStaticStorageStr(llvm::StringRef name);
 
private:
  /// Owns the copies made by get().
  llvm::BumpPtrAllocator m_string_storage;
  /// Set of all created Identifiers strings.
  llvm::DenseSet<llvm::StringRef> m_names;
};
 
} // namespace clike
} // namespace lldb_private
 
#endif // LLDB_SOURCE_PLUGINS_TYPESYSTEM_CLIKE_IDENTIFIER_H