constant_pointer_abstract_object.h

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/*******************************************************************\
 
 Module: analyses variable-sensitivity
 
 Author: Thomas Kiley, thomas.kiley@diffblue.com
 
\*******************************************************************/
 
#ifndef CPROVER_ANALYSES_VARIABLE_SENSITIVITY_CONSTANT_POINTER_ABSTRACT_OBJECT_H
#define CPROVER_ANALYSES_VARIABLE_SENSITIVITY_CONSTANT_POINTER_ABSTRACT_OBJECT_H
 
#include <iosfwd>
 
#include <analyses/variable-sensitivity/abstract_pointer_object.h>
#include <analyses/variable-sensitivity/write_stack.h>
 
class constant_pointer_abstract_objectt : public abstract_pointer_objectt
{
private:
  typedef sharing_ptrt<constant_pointer_abstract_objectt>
    constant_pointer_abstract_pointert;
 
public:
  constant_pointer_abstract_objectt(const typet &type, bool top, bool bottom);
 
  constant_pointer_abstract_objectt(
    const typet &type,
    const constant_pointer_abstract_objectt &old);
 
  constant_pointer_abstract_objectt(
    const exprt &expr,
    const abstract_environmentt &environment,
    const namespacet &ns);
 
  exprt to_constant() const override;
 
  void output(std::ostream &out, const ai_baset &ai, const namespacet &ns)
    const override;
 
  abstract_object_pointert read_dereference(
    const abstract_environmentt &env,
    const namespacet &ns) const override;
 
  abstract_object_pointert write_dereference(
    abstract_environmentt &environment,
    const namespacet &ns,
    const std::stack<exprt> &stack,
    const abstract_object_pointert &value,
    bool merging_write) const override;
 
  abstract_object_pointert typecast(
    const typet &new_type,
    const abstract_environmentt &environment,
    const namespacet &ns) const override;
 
  abstract_object_pointert ptr_diff(
    const exprt &expr,
    const std::vector<abstract_object_pointert> &operands,
    const abstract_environmentt &environment,
    const namespacet &ns) const override;
 
  exprt ptr_comparison_expr(
    const exprt &expr,
    const std::vector<abstract_object_pointert> &operands,
    const abstract_environmentt &environment,
    const namespacet &ns) const override;
 
  void get_statistics(
    abstract_object_statisticst &statistics,
    abstract_object_visitedt &visited,
    const abstract_environmentt &env,
    const namespacet &ns) const override;
 
protected:
  abstract_object_pointert merge(
    const abstract_object_pointert &op1,
    const widen_modet &widen_mode) const override;
 
  CLONE
 
  exprt to_predicate_internal(const exprt &name) const override;
 
private:
  bool same_target(abstract_object_pointert other) const;
  exprt offset() const;
  exprt offset_from(abstract_object_pointert other) const;
 
  abstract_object_pointert merge_constant_pointers(
    const constant_pointer_abstract_pointert &other,
    const widen_modet &widen_mode) const;
 
  write_stackt value_stack;
};
 
#endif // CPROVER_ANALYSES_VARIABLE_SENSITIVITY_CONSTANT_POINTER_ABSTRACT_OBJECT_H // NOLINT(*)