//===-- DIERef.h ------------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef SymbolFileDWARF_DIERef_h_
#define SymbolFileDWARF_DIERef_h_

#include "lldb/Core/dwarf.h"
#include "lldb/lldb-defines.h"

class DWARFFormValue;
class SymbolFileDWARF;

struct DIERef {
  DIERef() = default;

  DIERef(dw_offset_t c, dw_offset_t d) : cu_offset(c), die_offset(d) {}

  //----------------------------------------------------------------------
  // In order to properly decode a lldb::user_id_t back into a DIERef we
  // need the DWARF file since it knows if DWARF in .o files is being used
  // (MacOSX) or if DWO files are being used. The encoding of the user ID
  // differs between the two types of DWARF.
  //----------------------------------------------------------------------
  explicit DIERef(lldb::user_id_t uid, SymbolFileDWARF *dwarf);

  explicit DIERef(const DWARFFormValue &form_value);

  //----------------------------------------------------------------------
  // In order to properly encode a DIERef unto a lldb::user_id_t we need
  // the DWARF file since it knows if DWARF in .o files is being used
  // (MacOSX) or if DWO files are being used. The encoding of the user ID
  // differs between the two types of DWARF.
  //----------------------------------------------------------------------
  lldb::user_id_t GetUID(SymbolFileDWARF *dwarf) const;

  bool operator<(const DIERef &ref) const {
    return die_offset < ref.die_offset;
  }

  bool operator<(const DIERef &ref) { return die_offset < ref.die_offset; }

  explicit operator bool() const {
    return cu_offset != DW_INVALID_OFFSET || die_offset != DW_INVALID_OFFSET;
  }

  dw_offset_t cu_offset = DW_INVALID_OFFSET;
  dw_offset_t die_offset = DW_INVALID_OFFSET;
};

typedef std::vector<DIERef> DIEArray;

#endif // SymbolFileDWARF_DIERef_h_