unified_diff.h

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/*******************************************************************\
 
Module: Unified diff (using LCSS) of goto functions
 
Author: Michael Tautschnig
 
Date: April 2016
 
\*******************************************************************/

 
#ifndef CPROVER_GOTO_DIFF_UNIFIED_DIFF_H
#define CPROVER_GOTO_DIFF_UNIFIED_DIFF_H
 
#include <iosfwd>
#include <list>
#include <map>
#include <vector>
 
#include <util/namespace.h>
 
#include "goto-programs/goto_program.h"
 
class goto_functionst;
class goto_modelt;
 
class unified_difft
{
public:
  unified_difft(const goto_modelt &model_old, const goto_modelt &model_new);
 
  bool operator()();
 
  void output(std::ostream &os) const;
 
  enum class differencet
  {
    SAME,
    DELETED,
    NEW
  };
 
  typedef std::list<std::pair<goto_programt::const_targett, differencet>>
    goto_program_difft;
 
  goto_program_difft get_diff(const irep_idt &function) const;
 
private:
  const goto_functionst &old_goto_functions;
  const namespacet ns_old;
  const goto_functionst &new_goto_functions;
  const namespacet ns_new;
 
  typedef std::vector<differencet> differencest;
  typedef std::map<irep_idt, differencest> differences_mapt;
 
  void unified_diff(
    const irep_idt &identifier,
    const goto_programt &old_goto_program,
    const goto_programt &new_goto_program);
 
  static differencest lcss(
    const goto_programt &old_goto_program,
    const goto_programt &new_goto_program);
 
  static goto_program_difft get_diff(
    const goto_programt &old_goto_program,
    const goto_programt &new_goto_program,
    const differencest &differences);
 
  void output_diff(
    const irep_idt &identifier,
    const goto_programt &old_goto_program,
    const goto_programt &new_goto_program,
    const differencest &differences,
    std::ostream &os) const;
 
  static bool instructions_equal(
    const goto_programt::instructiont &ins1,
    const goto_programt::instructiont &ins2);
 
  const differences_mapt &differences_map() const;
 
  differences_mapt differences_map_;
};
 
#endif // CPROVER_GOTO_DIFF_UNIFIED_DIFF_H