llvm/llvm/include/llvm/Support/Registry.h

//=== Registry.h - Linker-supported plugin registries -----------*- 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
//
//===----------------------------------------------------------------------===//
//
// Defines a registry template for discovering pluggable modules.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_REGISTRY_H
#define LLVM_SUPPORT_REGISTRY_H

#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/DynamicLibrary.h"
#include <memory>

namespace llvm {
  /// A simple registry entry which provides only a name, description, and
  /// no-argument constructor.
  template <typename T>
  class SimpleRegistryEntry { … };

  /// A global registry used in conjunction with static constructors to make
  /// pluggable components (like targets or garbage collectors) "just work" when
  /// linked with an executable.
  template <typename T>
  class Registry { … };
} // end namespace llvm

/// Instantiate a registry class.
///
/// This provides template definitions of add_node, begin, and the Head and Tail
/// pointers, then explicitly instantiates them. We could explicitly specialize
/// them, instead of the two-step process of define then instantiate, but
/// strictly speaking that's not allowed by the C++ standard (we would need to
/// have explicit specialization declarations in all translation units where the
/// specialization is used) so we don't.
#define LLVM_INSTANTIATE_REGISTRY(REGISTRY_CLASS) …

#endif // LLVM_SUPPORT_REGISTRY_H