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//===-- llvm/IR/Comdat.h - Comdat definitions -------------------*- C++ -*-===//
//                     The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// @file
/// This file contains the declaration of the Comdat class, which represents a
/// single COMDAT in LLVM.


#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Compiler.h"

namespace llvm {

class raw_ostream;
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 {
  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.
    NoDuplicates, ///< No other Module may specify this COMDAT.
    SameSize,     ///< The data referenced by the COMDAT must be the same size.

  Comdat(Comdat &&C);
  SelectionKind getSelectionKind() const { return SK; }
  void setSelectionKind(SelectionKind Val) { SK = Val; }
  StringRef getName() const;
  void print(raw_ostream &OS) const;
  void dump() const;

  friend class Module;
  Comdat(SelectionKind SK, StringMapEntry<Comdat> *Name);
  Comdat(const Comdat &) LLVM_DELETED_FUNCTION;

  // Points to the map in Module.
  StringMapEntry<Comdat> *Name;
  SelectionKind SK;

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

} // end llvm namespace