cprover
value_set_pointer_abstract_object.h
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1 /*******************************************************************\
2 
3  Module: analyses variable-sensitivity
4 
5  Author: Diffblue Ltd.
6 
7 \*******************************************************************/
8 
11 
12 #ifndef CPROVER_ANALYSES_VARIABLE_SENSITIVITY_VALUE_SET_POINTER_ABSTRACT_OBJECT_H
13 #define CPROVER_ANALYSES_VARIABLE_SENSITIVITY_VALUE_SET_POINTER_ABSTRACT_OBJECT_H
14 
17 
19  public value_set_tag
20 {
21 public:
24 
26  const typet &new_type,
27  bool top,
28  bool bottom,
29  const abstract_object_sett &new_values);
30 
33 
35  const exprt &expr,
36  const abstract_environmentt &environment,
37  const namespacet &ns);
38 
40  exprt to_constant() const override
41  {
42  verify();
43  return values.size() == 1 ? (*values.begin())->to_constant()
45  }
46 
49  const abstract_object_sett &get_values() const override
50  {
51  return values;
52  }
53 
56  void set_values(const abstract_object_sett &other_values);
57 
60  static const size_t max_value_set_size = 10;
61 
63  const abstract_environmentt &env,
64  const namespacet &ns) const override;
65 
67  abstract_environmentt &environment,
68  const namespacet &ns,
69  const std::stack<exprt> &stack,
70  const abstract_object_pointert &new_value,
71  bool merging_write) const override;
72 
74  const typet &new_type,
75  const abstract_environmentt &environment,
76  const namespacet &ns) const override;
77 
79  const exprt &expr,
80  const std::vector<abstract_object_pointert> &operands,
81  const abstract_environmentt &environment,
82  const namespacet &ns) const override;
83 
85  const exprt &expr,
86  const std::vector<abstract_object_pointert> &operands,
87  const abstract_environmentt &environment,
88  const namespacet &ns) const override;
89 
90  void output(std::ostream &out, const ai_baset &ai, const namespacet &ns)
91  const override;
92 
93 protected:
94  CLONE
95 
98  const abstract_object_pointert &other,
99  const widen_modet &widen_mode) const override;
100 
101  exprt to_predicate_internal(const exprt &name) const override;
102 
103 private:
110  resolve_values(const abstract_object_sett &new_values) const;
111 
112  // data
114 };
115 
116 #endif // CPROVER_ANALYSES_VARIABLE_SENSITIVITY_VALUE_SET_POINTER_ABSTRACT_OBJECT_H
#define CLONE
sharing_ptrt< class abstract_objectt > abstract_object_pointert
an unordered set of value objects
The base of all pointer abstractions.
const_iterator begin() const
value_sett::size_type size() const
virtual exprt to_constant() const
Converts to a constant expression if possible.
virtual bool verify() const
Verify the internal structure of an abstract_object is correct.
virtual const typet & type() const
Get the real type of the variable this abstract object is representing.
This is the basic interface of the abstract interpreter with default implementations of the core func...
Definition: ai.h:119
Base class for all expressions.
Definition: expr.h:54
A namespacet is essentially one or two symbol tables bound together, to allow for symbol lookups in t...
Definition: namespace.h:91
The type of an expression, extends irept.
Definition: type.h:28
abstract_object_pointert resolve_values(const abstract_object_sett &new_values) const
Update the set of stored values to new_values.
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 to_constant() const override
Converts to a constant expression if possible.
exprt to_predicate_internal(const exprt &name) const override
to_predicate implementation - derived classes will override
CLONE abstract_object_pointert merge(const abstract_object_pointert &other, const widen_modet &widen_mode) const override
Merge two sets of constraints by appending to the first one.
static const size_t max_value_set_size
The threshold size for value-sets: past this threshold the object is either converted to interval or ...
void set_values(const abstract_object_sett &other_values)
Setter for updating the stored values.
void output(std::ostream &out, const ai_baset &ai, const namespacet &ns) const override
const abstract_object_sett & get_values() const override
Getter for the set of stored abstract objects.
abstract_object_pointert read_dereference(const abstract_environmentt &env, const namespacet &ns) const override
A helper function to read elements from an array.
abstract_object_pointert typecast(const typet &new_type, const abstract_environmentt &environment, 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 &new_value, bool merging_write) const override
Evaluate writing to a pointer's value.
exprt ptr_comparison_expr(const exprt &expr, const std::vector< abstract_object_pointert > &operands, const abstract_environmentt &environment, const namespacet &ns) const override