uninitialized_domain.h

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/*******************************************************************\
 
Module: Detection for Uninitialized Local Variables
 
Author: Daniel Kroening
 
Date: January 2010
 
\*******************************************************************/
 
 
#ifndef CPROVER_ANALYSES_UNINITIALIZED_DOMAIN_H
#define CPROVER_ANALYSES_UNINITIALIZED_DOMAIN_H
 
#include <util/threeval.h>
 
#include "ai.h"
 
class uninitialized_domaint:public ai_domain_baset
{
public:
  uninitialized_domaint():has_values(false)
  {
  }
 
  // Locals that are declared but may not be initialized
  typedef std::set<irep_idt> uninitializedt;
  uninitializedt uninitialized;
 
  void transform(
    const irep_idt &function_from,
    trace_ptrt trace_from,
    const irep_idt &function_to,
    trace_ptrt trace_to,
    ai_baset &ai,
    const namespacet &ns) final override;
 
  void output(
    std::ostream &out,
    const ai_baset &ai,
    const namespacet &ns) const final;
 
  void make_top() final override
  {
    uninitialized.clear();
    has_values=tvt(true);
  }
 
  void make_bottom() final override
  {
    uninitialized.clear();
    has_values=tvt(false);
  }
 
  void make_entry() final override
  {
    make_top();
  }
 
  bool is_top() const override final
  {
    DATA_INVARIANT(!has_values.is_true() || uninitialized.empty(),
                   "If domain is top, the uninitialized set must be empty");
    return has_values.is_true();
  }
 
  bool is_bottom() const override final
  {
    DATA_INVARIANT(!has_values.is_false() || uninitialized.empty(),
                   "If domain is bottom, the uninitialized set must be empty");
    return has_values.is_false();
  }
 
  // returns true iff there is something new
  bool
  merge(const uninitialized_domaint &other, trace_ptrt from, trace_ptrt to);
 
private:
  tvt has_values;
 
  void assign(const exprt &lhs);
};
 
typedef ait<uninitialized_domaint>
  uninitialized_analysist;
 
#endif // CPROVER_ANALYSES_UNINITIALIZED_DOMAIN_H