cprover
value_set_abstract_valuet Class Reference

#include <value_set_abstract_value.h>

+ Inheritance diagram for value_set_abstract_valuet:
+ Collaboration diagram for value_set_abstract_valuet:

Public Types

using valuest = std::unordered_set< exprt, irep_hash >
 
- Public Types inherited from abstract_objectt
typedef std::set< goto_programt::const_targettlocationst
 
typedef sharing_mapt< irep_idt, abstract_object_pointert, false, irep_id_hashshared_mapt
 

Public Member Functions

 value_set_abstract_valuet (const typet &type, bool top=true, bool bottom=false)
 
 value_set_abstract_valuet (exprt expr, const abstract_environmentt &environment, const namespacet &ns)
 
 value_set_abstract_valuet (const typet &type, valuest values)
 
const valuestget_values () const
 Get the possible values for this abstract object. More...
 
exprt to_constant () const override
 Converts to a constant expression if possible. More...
 
abstract_object_pointert expression_transform (const exprt &expr, const std::vector< abstract_object_pointert > &operands, const abstract_environmentt &environment, const namespacet &ns) const override
 Interface for transforms. More...
 
void output (std::ostream &out, const class ai_baset &ai, const namespacet &ns) const override
 Print the value of the abstract object. More...
 
- Public Member Functions inherited from abstract_objectt
 abstract_objectt (const typet &type)
 
 abstract_objectt (const typet &type, bool top, bool bottom)
 Start the abstract object at either top or bottom or neither Asserts if both top and bottom are true. More...
 
 abstract_objectt (const exprt &expr, const abstract_environmentt &environment, const namespacet &ns)
 Construct an abstract object from the expression. More...
 
 abstract_objectt (const typet &type, const exprt &expr, const abstract_environmentt &environment, const namespacet &ns)
 Ctor for building object of types that differ from the types of input expressions. More...
 
virtual ~abstract_objectt ()
 
virtual const typettype () const
 Get the real type of the variable this abstract object is representing. More...
 
virtual bool is_top () const
 Find out if the abstract object is top. More...
 
virtual bool is_bottom () const
 Find out if the abstract object is bottom. More...
 
virtual bool verify () const
 Verify the internal structure of an abstract_object is correct. More...
 
virtual void get_statistics (abstract_object_statisticst &statistics, abstract_object_visitedt &visited, const abstract_environmentt &env, const namespacet &ns) const
 
virtual abstract_object_pointert write (abstract_environmentt &environment, const namespacet &ns, const std::stack< exprt > &stack, const exprt &specifier, const abstract_object_pointert &value, bool merging_write) const
 A helper function to evaluate writing to a component of an abstract object. More...
 
virtual bool has_been_modified (const abstract_object_pointert before) const
 Determine whether 'this' abstract_object has been modified in comparison to a previous 'before' state. More...
 
virtual abstract_object_pointert meet (const abstract_object_pointert &other) const
 Base implementation of the meet operation: only used if no more precise abstraction can be used, can only result in {TOP, BOTTOM, one of the original objects}. More...
 
virtual abstract_object_pointert update_location_context (const locationst &locations, const bool update_sub_elements) const
 Update the location context for an abstract object, potentially propogating the update to any children of this abstract object. More...
 
abstract_object_pointert make_top () const
 
abstract_object_pointert clear_top () const
 
virtual abstract_object_pointert unwrap_context () const
 
virtual abstract_object_pointert visit_sub_elements (const abstract_object_visitort &visitor) const
 Apply a visitor operation to all sub elements of this abstract_object. More...
 
virtual size_t internal_hash () const
 
virtual bool internal_equality (const abstract_object_pointert &other) const
 

Static Public Attributes

static constexpr CLONE std::size_t max_value_set_size = 10
 TODO arbitrary limit, make configurable. More...
 

Protected Member Functions

abstract_object_pointert merge (abstract_object_pointert other) const override
 Create a new abstract object that is the result of the merge, unless the object would be unchanged, then would return itself. More...
 
- Protected Member Functions inherited from abstract_objectt
virtual internal_abstract_object_pointert mutable_clone () const
 
abstract_object_pointert abstract_object_merge (const abstract_object_pointert other) const
 Create a new abstract object that is the result of the merge, unless the object would be unchanged, then would return itself. More...
 
bool should_use_base_merge (const abstract_object_pointert other) const
 To detect the cases where the base merge is sufficient to do a merge We can't do if this->is_bottom() since we want the specific. More...
 
abstract_object_pointert abstract_object_meet (const abstract_object_pointert &other) const
 Helper function for base meet. More...
 
bool should_use_base_meet (const abstract_object_pointert &other) const
 Helper function to decide if base meet implementation should be used. More...
 
void set_top ()
 
void set_not_top ()
 

Private Attributes

valuest values
 If BOTTOM then empty. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from abstract_objectt
static void dump_map (std::ostream out, const shared_mapt &m)
 
static void dump_map_diff (std::ostream out, const shared_mapt &m1, const shared_mapt &m2)
 Dump all elements in m1 that are different or missing in m2. More...
 
static abstract_object_pointert merge (abstract_object_pointert op1, abstract_object_pointert op2, bool &out_modifications)
 Clones the first parameter and merges it with the second. More...
 
static abstract_object_pointert merge (abstract_object_pointert op1, abstract_object_pointert op2)
 
static abstract_object_pointert meet (abstract_object_pointert op1, abstract_object_pointert op2, bool &out_modifications)
 Interface method for the meet operation. More...
 
- Protected Types inherited from abstract_objectt
template<class T >
using internal_sharing_ptrt = std::shared_ptr< T >
 
typedef internal_sharing_ptrt< class abstract_objecttinternal_abstract_object_pointert
 

Detailed Description

Definition at line 21 of file value_set_abstract_value.h.

Member Typedef Documentation

◆ valuest

using value_set_abstract_valuet::valuest = std::unordered_set<exprt, irep_hash>

Definition at line 24 of file value_set_abstract_value.h.

Constructor & Destructor Documentation

◆ value_set_abstract_valuet() [1/3]

value_set_abstract_valuet::value_set_abstract_valuet ( const typet type,
bool  top = true,
bool  bottom = false 
)
explicit

Definition at line 14 of file value_set_abstract_value.cpp.

◆ value_set_abstract_valuet() [2/3]

value_set_abstract_valuet::value_set_abstract_valuet ( exprt  expr,
const abstract_environmentt environment,
const namespacet ns 
)

Definition at line 78 of file value_set_abstract_value.cpp.

◆ value_set_abstract_valuet() [3/3]

value_set_abstract_valuet::value_set_abstract_valuet ( const typet type,
valuest  values 
)

Definition at line 66 of file value_set_abstract_value.cpp.

Member Function Documentation

◆ expression_transform()

abstract_object_pointert value_set_abstract_valuet::expression_transform ( const exprt expr,
const std::vector< abstract_object_pointert > &  operands,
const abstract_environmentt environment,
const namespacet ns 
) const
overridevirtual

Interface for transforms.

Parameters
exprthe expression to evaluate and find the result of it. This will be the symbol referred to be op0()
operandsan abstract_object (pointer) that represent the possible values of each operand
environmentthe abstract environment in which the expression is being evaluated
nsthe current variable namespace
Returns
Returns the abstract_object representing the result of this expression to the maximum precision available.

To try and resolve different expressions with the maximum level of precision available.

Reimplemented from abstract_objectt.

Definition at line 191 of file value_set_abstract_value.cpp.

◆ get_values()

const value_set_abstract_valuet::valuest & value_set_abstract_valuet::get_values ( ) const

Get the possible values for this abstract object.

Only meaningful when this is neither TOP nor BOTTOM.

Definition at line 23 of file value_set_abstract_value.cpp.

◆ merge()

abstract_object_pointert value_set_abstract_valuet::merge ( abstract_object_pointert  other) const
overrideprotectedvirtual

Create a new abstract object that is the result of the merge, unless the object would be unchanged, then would return itself.

Parameters
otherThe object to merge with this
Returns
Returns the result of the merge.

Reimplemented from abstract_objectt.

Definition at line 31 of file value_set_abstract_value.cpp.

◆ output()

void value_set_abstract_valuet::output ( std::ostream &  out,
const class ai_baset ai,
const namespacet ns 
) const
overridevirtual

Print the value of the abstract object.

Parameters
outthe stream to write to
aithe abstract interpreter that contains the abstract domain (that contains the object ... )
nsthe current namespace

Reimplemented from abstract_objectt.

Definition at line 98 of file value_set_abstract_value.cpp.

◆ to_constant()

exprt value_set_abstract_valuet::to_constant ( ) const
overridevirtual

Converts to a constant expression if possible.

Returns
Returns an exprt representing the value if the value is known and constant. Otherwise returns the nil expression

If abstract element represents a single value, then that value, otherwise nil. E.G. if it is an interval then this will be x if it is [x,x] This is the (sort of) dual to the constant_exprt constructor that allows an object to be built from a value.

Reimplemented from abstract_objectt.

Definition at line 86 of file value_set_abstract_value.cpp.

Member Data Documentation

◆ max_value_set_size

constexpr CLONE std::size_t value_set_abstract_valuet::max_value_set_size = 10
staticconstexpr

TODO arbitrary limit, make configurable.

Definition at line 43 of file value_set_abstract_value.h.

◆ values

valuest value_set_abstract_valuet::values
private

If BOTTOM then empty.

If neither BOTTOM or TOP then the exact set of values. If TOP this field doesn't mean anything and shouldn't be looked at.

Definition at line 63 of file value_set_abstract_value.h.


The documentation for this class was generated from the following files: