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View File Name : Comdat.h

//===- llvm/IR/Comdat.h - Comdat definitions --------------------*- 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
//
//===----------------------------------------------------------------------===//
//
/// @file
/// This file contains the declaration of the Comdat class, which represents a
/// single COMDAT in LLVM.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_IR_COMDAT_H
#define LLVM_IR_COMDAT_H

#include "llvm-c/Types.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/CBindingWrapping.h"

namespace llvm {

class GlobalObject;
class raw_ostream;
class StringRef;
template <typename ValueTy> class StringMapEntry;

// This is a Name X SelectionKind pair. The reason for having this be an
// independent object instead of just adding the name and the SelectionKind
// to a GlobalObject is that it is invalid to have two Comdats with the same
// name but different SelectionKind. This structure makes that unrepresentable.
class Comdat {
public:
  enum SelectionKind {
    Any,           ///< The linker may choose any COMDAT.
    ExactMatch,    ///< The data referenced by the COMDAT must be the same.
    Largest,       ///< The linker will choose the largest COMDAT.
    NoDeduplicate, ///< No deduplication is performed.
    SameSize,      ///< The data referenced by the COMDAT must be the same size.
  };

  Comdat(const Comdat &) = delete;
  Comdat(Comdat &&C);

  SelectionKind getSelectionKind() const { return SK; }
  void setSelectionKind(SelectionKind Val) { SK = Val; }
  StringRef getName() const;
  void print(raw_ostream &OS, bool IsForDebug = false) const;
  void dump() const;
  const SmallPtrSetImpl<GlobalObject *> &getUsers() const { return Users; }

private:
  friend class Module;
  friend class GlobalObject;

  Comdat();
  void addUser(GlobalObject *GO);
  void removeUser(GlobalObject *GO);

  // Points to the map in Module.
  StringMapEntry<Comdat> *Name = nullptr;
  SelectionKind SK = Any;
  // Globals using this comdat.
  SmallPtrSet<GlobalObject *, 2> Users;
};

// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Comdat, LLVMComdatRef)

inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) {
  C.print(OS);
  return OS;
}

} // end namespace llvm

#endif // LLVM_IR_COMDAT_H