write_stack.h

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/*******************************************************************\
 
 Module: Variable Sensitivity Domain
 
 Author: DiffBlue Limited.
 
\*******************************************************************/

 
#ifndef CPROVER_ANALYSES_VARIABLE_SENSITIVITY_WRITE_STACK_H
#define CPROVER_ANALYSES_VARIABLE_SENSITIVITY_WRITE_STACK_H
 
#include <memory>
#include <vector>
 
class abstract_environmentt;
class exprt;
class index_exprt;
class namespacet;
class write_stack_entryt;
 
class write_stackt
{
public:
  typedef std::vector<std::shared_ptr<write_stack_entryt>>
    continuation_stack_storet;
 
  write_stackt();
 
  write_stackt(
    const exprt &expr,
    const abstract_environmentt &environment,
    const namespacet &ns);
 
  exprt to_expression() const;
 
  size_t depth() const;
  exprt target_expression(size_t depth) const;
  exprt offset_expression() const;
  bool is_top_value() const;
 
private:
  void construct_stack_to_pointer(
    const exprt &expr,
    const abstract_environmentt &environment,
    const namespacet &ns);
 
  void construct_stack_to_lvalue(
    const exprt &expr,
    const abstract_environmentt &environment,
    const namespacet &ns);
 
  void construct_stack_to_array_index(
    const index_exprt &expr,
    const abstract_environmentt &environment,
    const namespacet &ns);
 
  void add_to_stack(
    std::shared_ptr<write_stack_entryt> entry_pointer,
    const abstract_environmentt environment,
    const namespacet &ns);
 
  enum class integral_resultt
  {
    LHS_INTEGRAL,
    RHS_INTEGRAL,
    NEITHER_INTEGRAL
  };
 
  static integral_resultt get_which_side_integral(
    const exprt &expr,
    exprt &out_base_expr,
    exprt &out_integral_expr);
 
  continuation_stack_storet stack;
  bool top_stack;
};
 
#endif // CPROVER_ANALYSES_VARIABLE_SENSITIVITY_WRITE_STACK_H