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/*******************************************************************\
Module: Unit tests for variable/sensitivity/abstract_object::merge
Author: DiffBlue Limited.
\*******************************************************************/
#include <util/arith_tools.h>
#include <util/bitvector_types.h>
#include <util/namespace.h>
#include <util/symbol_table.h>
#include <analyses/variable-sensitivity/abstract_environment.h>
#include <analyses/variable-sensitivity/abstract_object.h>
#include <testing-utils/use_catch.h>
// NOLINTNEXTLINE(whitespace/line_length)
#include <analyses/variable-sensitivity/constant_abstract_value.h> // IWYU pragma: keep
#include <analyses/variable-sensitivity/variable_sensitivity_object_factory.h>
#include <analyses/variable-sensitivity/variable_sensitivity_test_helpers.h>
SCENARIO(
"merge abstract object",
"[core][analyses][variable-sensitivity][abstract_object][merge]")
{
GIVEN("merging two abstract objects")
{
WHEN("merging TOP with TOP")
{
abstract_object_pointert op1 = make_top_object();
abstract_object_pointert op2 = make_top_object();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("result is unmodified TOP")
{
EXPECT_UNMODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging TOP with BOTTOM")
{
abstract_object_pointert op1 = make_top_object();
abstract_object_pointert op2 = make_bottom_object();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("result is unmodified TOP")
{
EXPECT_UNMODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging BOTTOM with TOP")
{
abstract_object_pointert op1 = make_bottom_object();
abstract_object_pointert op2 = make_top_object();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("result is modified TOP")
{
EXPECT_MODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging BOTTOM with BOTTOM")
{
abstract_object_pointert op1 = make_bottom_object();
abstract_object_pointert op2 = make_bottom_object();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("result is unmodified BOTTOM")
{
EXPECT_UNMODIFIED(result);
EXPECT_BOTTOM(result);
}
}
}
GIVEN("an abstract object and a constant")
{
const typet type = signedbv_typet(32);
const exprt val1 = from_integer(1, type);
const exprt val2 = from_integer(2, type);
auto config = vsd_configt::constant_domain();
config.context_tracking.data_dependency_context = false;
config.context_tracking.last_write_context = false;
auto object_factory =
variable_sensitivity_object_factoryt::configured_with(config);
abstract_environmentt environment{object_factory};
environment.make_top();
symbol_tablet symbol_table;
namespacet ns(symbol_table);
WHEN("merging TOP with 1")
{
auto top1 = make_top_object();
auto op2 = make_constant(val1, environment, ns);
auto result = abstract_objectt::merge(top1, op2, widen_modet::no);
THEN("the result is unmodified TOP")
{
EXPECT_UNMODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging TOP with TOP constant")
{
auto top1 = make_top_object();
auto top2 = make_top_constant();
auto result = abstract_objectt::merge(top1, top2, widen_modet::no);
THEN("the result is unmodified TOP")
{
EXPECT_UNMODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging TOP with BOTTOM constant")
{
auto top1 = make_top_object();
auto bottom2 = make_bottom_constant();
auto result = abstract_objectt::merge(top1, bottom2, widen_modet::no);
THEN("the result is unmodified TOP")
{
EXPECT_UNMODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging BOTTOM with 1")
{
auto op1 = make_bottom_object();
auto op2 = make_constant(val1, environment, ns);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("the result is modified TOP")
{
EXPECT_MODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging BOTTOM with TOP constant")
{
auto op1 = make_bottom_object();
auto top2 = make_top_constant();
auto result = abstract_objectt::merge(op1, top2, widen_modet::no);
THEN("the result is modified TOP")
{
EXPECT_MODIFIED(result);
EXPECT_TOP(result);
}
}
WHEN("merging BOTTOM with BOTTOM constant")
{
auto bottom1 = make_bottom_object();
auto bottom2 = make_bottom_constant();
auto result = abstract_objectt::merge(bottom1, bottom2, widen_modet::no);
THEN("result is unmodified BOTTOM")
{
EXPECT_UNMODIFIED(result);
EXPECT_BOTTOM(result);
}
}
}
}
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