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/*******************************************************************\
Module: Tests for full_array_abstract_objectt maximum length
Author: Jez Higgins
\*******************************************************************/
#include "array_builder.h"
#include <analyses/variable-sensitivity/variable_sensitivity_object_factory.h>
#include <analyses/variable-sensitivity/variable_sensitivity_test_helpers.h>
#include <testing-utils/use_catch.h>
#include <util/arith_tools.h>
#include <util/bitvector_types.h>
#include <util/symbol_table.h>
using abstract_object_ptrt = std::shared_ptr<const abstract_objectt>;
static abstract_object_ptrt write_array(
const abstract_object_ptrt &array,
int index,
int new_value,
abstract_environmentt &env,
namespacet &ns)
{
const typet type = signedbv_typet(32);
return array->write(
env,
ns,
std::stack<exprt>(),
index_exprt(
exprt(ID_nil, array_typet(typet(), nil_exprt())),
from_integer(index, type)),
env.eval(from_integer(new_value, type), ns),
false);
}
SCENARIO(
"arrays have maximum length",
"[core][analyses][variable-sensitivity][full_array_abstract_object][max_"
"array]")
{
for(size_t max_array_index = 10; max_array_index <= 20; max_array_index += 10)
{
auto configuration = vsd_configt::value_set();
configuration.maximum_array_index = max_array_index;
auto object_factory =
variable_sensitivity_object_factoryt::configured_with(configuration);
abstract_environmentt environment(object_factory);
environment.make_top();
symbol_tablet symbol_table;
namespacet ns(symbol_table);
WHEN("maximum size is " + std::to_string(max_array_index))
{
WHEN("array = {1, 2, 3}, writes under maximum size")
{
WHEN("array[3] = 4")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated = write_array(array, 3, 4, environment, ns);
THEN("array equals {1, 2, 3, 4}")
{
EXPECT_INDEX(updated, 0, 1, environment, ns);
EXPECT_INDEX(updated, 1, 2, environment, ns);
EXPECT_INDEX(updated, 2, 3, environment, ns);
EXPECT_INDEX(updated, 3, 4, environment, ns);
}
}
WHEN("a[0] = 99")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated = write_array(array, 0, 99, environment, ns);
THEN("array equals {99, 2, 3}")
{
EXPECT_INDEX(updated, 0, 99, environment, ns);
EXPECT_INDEX(updated, 1, 2, environment, ns);
EXPECT_INDEX(updated, 2, 3, environment, ns);
}
}
WHEN("a[5] = 99")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated = write_array(array, 5, 99, environment, ns);
THEN("array equals {1, 2, 3, <empty>, <empty>, 99}")
{
EXPECT_INDEX(updated, 0, 1, environment, ns);
EXPECT_INDEX(updated, 1, 2, environment, ns);
EXPECT_INDEX(updated, 2, 3, environment, ns);
EXPECT_INDEX_TOP(updated, 3, environment, ns);
EXPECT_INDEX_TOP(updated, 4, environment, ns);
EXPECT_INDEX(updated, 5, 99, environment, ns);
}
}
}
WHEN("array = {1, 2, 3}, writes beyond maximum size mapped to max_size")
{
WHEN("array[99] = 4")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated = write_array(array, 99, 4, environment, ns);
THEN(
"array equals {1, 2, 3, ..., [" + std::to_string(max_array_index) +
"] = 4}")
{
EXPECT_INDEX(updated, 0, 1, environment, ns);
EXPECT_INDEX(updated, 1, 2, environment, ns);
EXPECT_INDEX(updated, 2, 3, environment, ns);
EXPECT_INDEX(updated, max_array_index, 4, environment, ns);
}
}
}
WHEN("array = {1, 2, 3}, reads beyond maximum size mapped to max_size")
{
WHEN("a[max] = 4")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated =
write_array(array, max_array_index, 4, environment, ns);
for(size_t i = max_array_index; i <= max_array_index * 3; i += 5)
THEN("array[" + std::to_string(i) + "] = 4}")
{
EXPECT_INDEX(updated, i, 4, environment, ns);
}
}
}
WHEN("array = {1, 2, 3}, writes beyond maximum size are merged")
{
WHEN("array[98] = 3, array[99] = 4")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated = write_array(array, 99, 4, environment, ns);
updated = write_array(updated, 98, 3, environment, ns);
THEN(
"array equals {1, 2, 3, ..., [" + std::to_string(max_array_index) +
"] = TOP}")
{
EXPECT_INDEX(updated, 0, 1, environment, ns);
EXPECT_INDEX(updated, 1, 2, environment, ns);
EXPECT_INDEX(updated, 2, 3, environment, ns);
EXPECT_INDEX(updated, max_array_index, {3, 4}, environment, ns);
}
}
WHEN("array[99] = 3, array[99] = 4, array[100] = 5")
{
auto array = build_array({1, 2, 3}, environment, ns);
auto updated = write_array(array, 100, 5, environment, ns);
updated = write_array(updated, 99, 4, environment, ns);
updated = write_array(updated, 98, 3, environment, ns);
THEN(
"array equals {1, 2, 3, ..., [" + std::to_string(max_array_index) +
"] = TOP}")
{
EXPECT_INDEX(updated, 0, 1, environment, ns);
EXPECT_INDEX(updated, 1, 2, environment, ns);
EXPECT_INDEX(updated, 2, 3, environment, ns);
EXPECT_INDEX(updated, max_array_index, {3, 4, 5}, environment, ns);
}
}
}
}
}
}
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