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/*******************************************************************\
Module: Unit tests for full_array_abstract_objectt::merge
Author: DiffBlue Limited.
\*******************************************************************/
#include <testing-utils/use_catch.h>
#include <typeinfo>
#include <analyses/variable-sensitivity/abstract_environment.h>
#include <analyses/variable-sensitivity/abstract_object.h>
#include <analyses/variable-sensitivity/full_array_abstract_object/array_builder.h>
#include <analyses/variable-sensitivity/variable_sensitivity_object_factory.h>
#include <analyses/variable-sensitivity/variable_sensitivity_test_helpers.h>
#include <util/arith_tools.h>
#include <util/bitvector_types.h>
#include <util/namespace.h>
#include <util/std_expr.h>
#include <util/symbol_table.h>
SCENARIO(
"merge_constant_array_abstract_object",
"[core]"
"[analyses][variable-sensitivity][full_array_abstract_object][merge]")
{
GIVEN("Two arrays of size 3, whose first elements are the same")
{
const typet type = signedbv_typet(32);
// int val2[3] = {1, 2, 3}
auto val1 = std::vector<int>{1, 2, 3};
// int val2[3] = {1, 4, 5}
auto val2 = std::vector<int>{1, 4, 5};
// index_exprt for reading from an array
const index_exprt i0 = index_exprt(
exprt(ID_nil, array_typet(typet(), nil_exprt())), from_integer(0, type));
const index_exprt i1 = index_exprt(
exprt(ID_nil, array_typet(typet(), nil_exprt())), from_integer(1, type));
const index_exprt i2 = index_exprt(
exprt(ID_nil, array_typet(typet(), nil_exprt())), from_integer(2, type));
auto object_factory = variable_sensitivity_object_factoryt::configured_with(
vsd_configt::constant_domain());
abstract_environmentt environment(object_factory);
environment.make_top();
symbol_tablet symbol_table;
namespacet ns(symbol_table);
WHEN("Merging two constant array AOs with the same array")
{
auto op1 = build_array(val1, environment, ns);
auto op2 = build_array(val1, environment, ns);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original constant array AO should be returned")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX(result.object, i, val1[i], environment, ns);
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN("Merging two constant array AOs with different value arrays")
{
auto op1 = build_array(val1, environment, ns);
auto op2 = build_array(val2, environment, ns);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN(
"A new constant array AO whose first value is the same and "
"the other two are top")
{
// Correctness of merge
REQUIRE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
EXPECT_INDEX(result.object, 0, val1[0], environment, ns);
EXPECT_INDEX_TOP(result.object, 1, environment, ns);
EXPECT_INDEX_TOP(result.object, 1, environment, ns);
// Since it has modified, we definitely shouldn't be reusing the pointer
REQUIRE_FALSE(result.object == op1);
}
}
WHEN(
"Merging a constant array AO with a value "
"with a constant array AO set to top")
{
auto op1 = build_array(val1, environment, ns);
auto op2 = build_top_array();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("A new constant array AO set to top should be returned")
{
// Correctness of merge
REQUIRE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX_TOP(result.object, i, environment, ns);
// We can't reuse the abstract object as the value has changed
REQUIRE(result.object != op1);
}
}
WHEN(
"Merging a constant array AO with a value "
"with a constant array AO set to bottom")
{
auto op1 = build_array(val1, environment, ns);
auto op2 = build_bottom_array();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original const AO should be returned")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX(result.object, i, val1[i], environment, ns);
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging a constant array AO set to top "
"with a constant array AO with a value")
{
auto op1 = build_top_array();
auto op2 = build_array(val1, environment, ns);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original constant array AO should be returned")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX_TOP(result.object, i, environment, ns);
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging a constant array AO set to top "
"with a constant array AO set to top")
{
auto op1 = build_top_array();
auto op2 = build_top_array();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original constant array AO should be returned")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX_TOP(result.object, i, environment, ns);
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging a constant array AO set to top "
"with a constant array AO set to bottom")
{
auto op1 = build_top_array();
auto op2 = build_bottom_array();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original constant array AO should be returned")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX_TOP(result.object, i, environment, ns);
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging a constant array AO set to bottom "
"with a constant array AO with a value")
{
auto op1 = build_bottom_array();
auto op2 = build_array(val1, environment, ns);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("A new AO should be returned with op2s valuee")
{
// Correctness of merge
REQUIRE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX(result.object, i, val1[i], environment, ns);
// Is optimal
REQUIRE(result.object != op1);
}
}
WHEN(
"Merging a constant array AO set to bottom "
"with a constant array AO set to top")
{
auto op1 = build_bottom_array();
auto op2 = build_top_array();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("A new constant array AO should be returned set to top ")
{
// Correctness of merge
REQUIRE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX_TOP(result.object, i, environment, ns);
// Is optimal
REQUIRE(result.object != op1);
}
}
WHEN(
"Merging a constant array AO set to bottom "
"with a constant array AO set to bottom")
{
auto op1 = build_bottom_array();
auto op2 = build_bottom_array();
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original bottom AO should be returned")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE(result.object->is_bottom());
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging constant array AO with value "
"with a abstract object set to top")
{
const auto &op1 = build_array(val1, environment, ns);
const auto &op2 =
std::make_shared<abstract_objectt>(op1->type(), true, false);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("We should get a new AO of the same type but set to top")
{
// Though we may become top or bottom, the type should be unchanged
REQUIRE(result.object);
// Correctness of merge
REQUIRE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// Since it has modified, we definitely shouldn't be reusing the pointer
REQUIRE_FALSE(result.object == op1);
}
}
WHEN(
"Merging constant array AO with value "
"with a abstract object set to bottom")
{
const auto &op1 = build_array(val1, environment, ns);
const auto &op2 =
std::make_shared<abstract_objectt>(op1->type(), false, true);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("We should get the same constant array AO back")
{
// Correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
for(int i = 0; i != 3; ++i)
EXPECT_INDEX(result.object, i, val1[i], environment, ns);
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging constant array AO set to top "
"with a abstract object set to top")
{
const auto &op1 = build_top_array();
const auto &op2 =
std::make_shared<abstract_objectt>(op1->type(), true, false);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("We should get the same abstract object back")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging constant array AO set to top "
"with a abstract object set to bottom")
{
const auto &op1 = build_top_array();
const auto &op2 =
std::make_shared<abstract_objectt>(op1->type(), false, true);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("Should get the same abstract object back")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN(
"Merging constant array AO set to bottom "
" with a abstract object set to top")
{
const auto &op1 = build_bottom_array();
const auto &op2 =
std::make_shared<abstract_objectt>(op1->type(), true, false);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("Return a new top abstract object of the same type")
{
// Simple correctness of merge
REQUIRE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// We don't optimize for returning the second parameter if we can
// Is type still correct
const auto &cast_result =
std::dynamic_pointer_cast<const full_array_abstract_objectt>(
result.object);
// Though we may become top or bottom, the type should be unchanged
REQUIRE(cast_result);
}
}
WHEN("Merging constant array AO set to bottom with a AO set to bottom")
{
const auto &op1 = build_bottom_array();
const auto &op2 =
std::make_shared<abstract_objectt>(op1->type(), false, true);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("Return the original abstract object")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE(result.object->is_bottom());
// Optimization check
REQUIRE(result.object == op1);
// Is type still correct
const auto &cast_result =
std::dynamic_pointer_cast<const full_array_abstract_objectt>(
result.object);
// Though we may become top or bottom, the type should be unchanged
REQUIRE(cast_result);
}
}
WHEN("Merging AO set to top with a constant array AO with a value")
{
const auto &op2 = build_array(val1, environment, ns);
const auto &op1 =
std::make_shared<abstract_objectt>(op2->type(), true, false);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original AO should be returned")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN("Merging AO set to top with a constant array AO set to top")
{
const auto &op2 = build_top_array();
const auto &op1 =
std::make_shared<abstract_objectt>(op2->type(), true, false);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original AO should be returned")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN("Merging AO set to top with a constant array AO set to bottom")
{
const auto &op2 = build_bottom_array();
const auto &op1 =
std::make_shared<abstract_objectt>(op2->type(), true, false);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original AO should be returned")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// Is optimal
REQUIRE(result.object == op1);
}
}
WHEN("Merging AO set to bottom with a constant array AO with a value")
{
const auto &op2 = build_array(val1, environment, ns);
const auto &op1 =
std::make_shared<abstract_objectt>(op2->type(), false, true);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The a new top AO should be returned")
{
// Simple correctness of merge
REQUIRE(result.modified);
REQUIRE(
typeid(result.object.get()) == typeid(const abstract_objectt *));
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
}
// We don't optimize for returning the second parameter if we can
}
WHEN("Merging AO set to bottom with a constant array AO set to top")
{
const auto &op2 = build_array(val1, environment, ns);
const auto &op1 =
std::make_shared<abstract_objectt>(op2->type(), false, true);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The a new top AO should be returned")
{
// Simple correctness of merge
REQUIRE(result.modified);
REQUIRE(result.object->is_top());
REQUIRE_FALSE(result.object->is_bottom());
// We don't optimize for returning the second parameter if we can
}
}
WHEN("Merging AO set to bottom with a constant array AO set to bottom")
{
const auto &op2 = build_bottom_array();
const auto &op1 =
std::make_shared<abstract_objectt>(op2->type(), false, true);
auto result = abstract_objectt::merge(op1, op2, widen_modet::no);
THEN("The original AO should be returned")
{
// Simple correctness of merge
REQUIRE_FALSE(result.modified);
REQUIRE_FALSE(result.object->is_top());
REQUIRE(result.object->is_bottom());
REQUIRE(result.object == op1);
}
}
}
}
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