72 auto const &
id = expr.
id();
113 auto const operands =
eval_operands(simplified_expr, *
this, ns);
114 auto const &target = operands.front();
116 return target->expression_transform(simplified_expr, operands, *
this, ns);
130 if(!simplified_expr.
operands().empty())
157 if(value->is_bottom())
161 return !bottom_at_start;
206 throw std::runtime_error(
"invalid l-value");
215 "Assignment types must match"
252 "Write stack expressions must be index, member, or dereference");
267 if(assumption.id() !=
ID_nil)
270 INVARIANT(assumption.is_boolean(),
"simplification preserves type");
272 if(assumption.is_false())
306 return fn(*
this, expr, ns);
308 return eval(expr, ns)->to_constant();
339 type, top,
bttm, e, environment, ns);
365 bool modified =
false;
366 for(
const auto &entry :
env.map.get_delta_view(
map))
414 for(
const auto &entry :
map.get_view())
416 out << entry.first <<
" () -> ";
432 for(
const auto &entry :
map.get_view())
434 auto sym = entry.first;
435 auto val = entry.second;
450 for(
const auto &entry :
map.get_view())
452 if(entry.second ==
nullptr)
472 return eval_obj->expression_transform(e, operands, *
this, ns);
480std::vector<abstract_environmentt::map_keyt>
486 std::vector<abstract_environmentt::map_keyt>
symbols_diff;
487 for(
const auto &entry : first.
map.get_view())
492 if(
second_entry.value().get()->has_been_modified(entry.second))
501 for(
const auto &entry : second.
map.get_view())
516 auto val = std::count_if(
519 [](
const symbol_tablet::const_iteratort::value_type &
sym) {
520 return sym.second.is_lvalue && sym.second.is_static_lifetime;
531 for(
auto const &
object :
map.get_view())
533 if(visited.find(
object.second) == visited.end())
535 object.second->get_statistics(statistics, visited, *
this, ns);
546 std::vector<abstract_object_pointert> operands;
548 for(
const auto &op : expr.
operands())
549 operands.push_back(
env.eval(op, ns));
557 return std::dynamic_pointer_cast<const abstract_value_objectt>(
558 obj->unwrap_context());
606 std::dynamic_pointer_cast<const context_abstract_objectt>(previous);
607 if(context !=
nullptr)
608 obj = context->envelop(
obj);
637 if(result.is_false())
639 nil |= result.is_nil();
679 return left ==
nullptr ||
right ==
nullptr ||
686 return left->is_top() ||
right->is_top();
699 auto left =
env.eval(lhs, ns);
700 auto right =
env.eval(rhs, ns);
702 if(left->is_top() && right->is_top())
705 return {lhs, rhs, left, right};
716 auto constrained = std::make_shared<interval_abstract_valuet>(
723 auto constrained = std::make_shared<interval_abstract_valuet>(
737 if(operands.are_bad())
740 if(operands.has_top())
743 auto meet = operands.left->meet(operands.right);
745 if(meet->is_bottom())
765 if(left->is_top() || right->is_top())
770 auto meet = left->meet(right);
772 if(meet->is_bottom())
789 operands.
left->type());
800 operands.
right->type());
815 if(operands.are_bad())
818 if(operands.has_top())
821 auto left_interval = operands.left_interval();
822 auto right_interval = operands.right_interval();
824 const auto &
left_lower = left_interval.get_lower();
825 const auto &
right_upper = right_interval.get_upper();
std::vector< abstract_object_pointert > eval_operands(const exprt &expr, const abstract_environmentt &env, const namespacet &ns)
static auto assume_functions
static bool is_value(const abstract_object_pointert &obj)
static exprt assume_not(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
static auto inverse_operations
static exprt invert_expr(const exprt &expr)
static abstract_value_pointert as_value(const abstract_object_pointert &obj)
static bool is_object_creation(const irep_idt &id)
static auto symmetric_operations
static bool is_access_expr(const irep_idt &id)
left_and_right_valuest eval_operands_as_values(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
static exprt assume_eq(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
static exprt assume_noteq(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
static std::size_t count_globals(const namespacet &ns)
static exprt assume_or(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
exprt(* assume_function)(abstract_environmentt &, const exprt &, const namespacet &)
static exprt assume_less_than(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
static exprt invert_result(const exprt &result)
exprt assume_less_than_unbounded(abstract_environmentt &env, const left_and_right_valuest &operands, const namespacet &ns)
static exprt assume_and(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
bool is_ptr_comparison(const exprt &expr)
void prune_assign(abstract_environmentt &env, const abstract_object_pointert &previous, const exprt &destination, abstract_object_pointert obj, const namespacet &ns)
static bool is_dynamic_allocation(const exprt &expr)
exprt assume_eq_unbounded(abstract_environmentt &env, const left_and_right_valuest &operands, const namespacet &ns)
static exprt assume_greater_than(abstract_environmentt &env, const exprt &expr, const namespacet &ns)
bool is_ptr_diff(const exprt &expr)
An abstract version of a program environment.
bool is_ptr_comparison(const exprt &expr)
bool is_ptr_diff(const exprt &expr)
std::set< abstract_object_pointert > abstract_object_visitedt
sharing_ptrt< class abstract_objectt > abstract_object_pointert
Statistics gathering for the variable senstivity domain.
virtual bool assume(const exprt &expr, const namespacet &ns)
Reduces the domain based on a condition.
void output(std::ostream &out, const class ai_baset &ai, const namespacet &ns) const
Print out all the values in the abstract object map.
bool is_bottom() const
Gets whether the domain is bottom.
abstract_object_pointert resolve_symbol(const exprt &e, const namespacet &ns) const
exprt to_predicate() const
Gives a boolean condition that is true for all values represented by the environment.
void make_top()
Set the domain to top (i.e. everything)
virtual abstract_object_pointert eval(const exprt &expr, const namespacet &ns) const
These three are really the heart of the method.
void erase(const symbol_exprt &expr)
Delete a symbol from the map.
static std::vector< abstract_environmentt::map_keyt > modified_symbols(const abstract_environmentt &first, const abstract_environmentt &second)
For our implementation of variable sensitivity domains, we need to be able to efficiently find symbol...
bool verify() const
Check the structural invariants are maintained.
virtual void havoc(const std::string &havoc_string)
This should be used as a default case / everything else has failed The string is so that I can easily...
exprt do_assume(const exprt &e, const namespacet &ns)
const vsd_configt & configuration() const
Exposes the environment configuration.
variable_sensitivity_object_factory_ptrt object_factory
virtual abstract_object_pointert write(const abstract_object_pointert &lhs, const abstract_object_pointert &rhs, std::stack< exprt > remaining_stack, const namespacet &ns, bool merge_write)
Used within assign to do the actual dispatch.
abstract_object_statisticst gather_statistics(const namespacet &ns) const
virtual bool merge(const abstract_environmentt &env, const goto_programt::const_targett &merge_location, widen_modet widen_mode)
Computes the join between "this" and "b".
void make_bottom()
Set the domain to top (i.e. no possible states / unreachable)
bool is_top() const
Gets whether the domain is top.
virtual abstract_object_pointert abstract_object_factory(const typet &type, const namespacet &ns, bool top, bool bottom) const
Look at the configuration for the sensitivity and create an appropriate abstract_object.
virtual abstract_object_pointert eval_expression(const exprt &e, const namespacet &ns) const
virtual bool assign(const exprt &expr, const abstract_object_pointert &value, const namespacet &ns)
Assign a value to an expression.
sharing_mapt< map_keyt, abstract_object_pointert > map
static combine_result merge(const abstract_object_pointert &op1, const abstract_object_pointert &op2, const locationt &merge_location, const widen_modet &widen_mode)
This is the basic interface of the abstract interpreter with default implementations of the core func...
virtual void output(const namespacet &ns, const irep_idt &function_id, const goto_programt &goto_program, std::ostream &out) const
Output the abstract states for a single function.
virtual void clear()
Reset the abstract state.
ait supplies three of the four components needed: an abstract interpreter (in this case handling func...
A base class for relations, i.e., binary predicates whose two operands have the same type.
Represents an interval of values.
static exprt get_max(const exprt &a, const exprt &b)
static exprt get_min(const exprt &a, const exprt &b)
const exprt & get_lower() const
const exprt & get_upper() const
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Base class for all expressions.
std::vector< exprt > operandst
bool is_true() const
Return whether the expression is a constant representing true.
bool is_boolean() const
Return whether the expression represents a Boolean.
typet & type()
Return the type of the expression.
The Boolean constant false.
instructionst::const_iterator const_targett
const irep_idt & get(const irep_idt &name) const
const irep_idt & id() const
+∞ upper bound for intervals
-∞ upper bound for intervals
A namespacet is essentially one or two symbol tables bound together, to allow for symbol lookups in t...
const symbol_table_baset & get_symbol_table() const
Return first symbol table registered with the namespace.
Expression to hold a symbol (variable)
const irep_idt & get_identifier() const
The Boolean constant true.
The type of an expression, extends irept.
General implementation of a an abstract_objectt which can track side information in the form of a 'co...
bool is_assignable(const exprt &expr)
Returns true iff the argument is one of the following:
Deprecated expression utility functions.
An interval to represent a set of possible values.
exprt simplify_expr(exprt src, const namespacet &ns)
bool sort_operands(exprt::operandst &operands)
sort operands of an expression according to ordering defined by operator<
#define CHECK_RETURN(CONDITION)
#define PRECONDITION(CONDITION)
#define INVARIANT(CONDITION, REASON)
This macro uses the wrapper function 'invariant_violated_string'.
const binary_relation_exprt & to_binary_relation_expr(const exprt &expr)
Cast an exprt to a binary_relation_exprt.
const and_exprt & to_and_expr(const exprt &expr)
Cast an exprt to a and_exprt.
const or_exprt & to_or_expr(const exprt &expr)
Cast an exprt to a or_exprt.
const binary_exprt & to_binary_expr(const exprt &expr)
Cast an exprt to a binary_exprt.
const not_exprt & to_not_expr(const exprt &expr)
Cast an exprt to an not_exprt.
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
std::size_t number_of_globals
abstract_object_pointert right
constant_interval_exprt right_interval() const
constant_interval_exprt left_interval() const
abstract_object_pointert left
Tracks the user-supplied configuration for VSD and build the correct type of abstract object when nee...