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// Author: Diffblue Ltd.
#include <util/arith_tools.h>
#include <util/bitvector_expr.h>
#include <util/bitvector_types.h>
#include <util/cout_message.h>
#include <util/namespace.h>
#include <util/std_expr.h>
#include <util/symbol_table.h>
#include <solvers/flattening/boolbv.h>
#include <solvers/sat/satcheck.h>
#include <testing-utils/use_catch.h>
TEST_CASE(
"Overflow expression construction as binary_overflow_exprt",
"[core][util][expr]")
{
std::string kind;
std::function<bool(const exprt &)> can_cast;
using rowt = std::pair<std::string, std::function<bool(const exprt &)>>;
std::tie(kind, can_cast) = GENERATE(
rowt{"+", can_cast_expr<plus_overflow_exprt>},
rowt{"*", can_cast_expr<mult_overflow_exprt>},
rowt{"-", can_cast_expr<minus_overflow_exprt>},
rowt{"shl", can_cast_expr<shl_overflow_exprt>});
SECTION("For " + kind + " overflow.")
{
const symbol_exprt left{"left", unsignedbv_typet{8}};
const symbol_exprt right{"right", unsignedbv_typet{8}};
const binary_overflow_exprt overflow{left, kind, right};
SECTION("Expression can be downcast.")
{
REQUIRE(can_cast(overflow));
}
SECTION("Operand getters")
{
REQUIRE(overflow.lhs() == left);
REQUIRE(overflow.rhs() == right);
}
}
}
TEMPLATE_TEST_CASE(
"Overflow expression sub classes",
"[core][util][expr]",
plus_overflow_exprt,
mult_overflow_exprt,
minus_overflow_exprt,
shl_overflow_exprt)
{
SECTION("Construction")
{
const symbol_exprt left{"left", unsignedbv_typet{8}};
const symbol_exprt right{"right", unsignedbv_typet{8}};
const TestType sub_class{left, right};
SECTION("Upcast")
{
const auto binary_overflow_expr =
expr_try_dynamic_cast<binary_overflow_exprt>(sub_class);
REQUIRE(binary_overflow_expr);
SECTION("Downcast")
{
REQUIRE(expr_try_dynamic_cast<TestType>(*binary_overflow_expr));
}
}
SECTION("Operand getters")
{
REQUIRE(sub_class.lhs() == left);
REQUIRE(sub_class.rhs() == right);
}
}
}
TEST_CASE("onehot expression lowering", "[core][util][expr]")
{
console_message_handlert message_handler;
message_handler.set_verbosity(0);
satcheckt satcheck{message_handler};
symbol_tablet symbol_table;
namespacet ns{symbol_table};
boolbvt boolbv{ns, satcheck, message_handler};
unsignedbv_typet u8{8};
GIVEN("A bit-vector that is one-hot")
{
boolbv << onehot_exprt{from_integer(64, u8)}.lower();
THEN("the lowering of onehot is true")
{
REQUIRE(boolbv() == decision_proceduret::resultt::D_SATISFIABLE);
}
}
GIVEN("A bit-vector that is not one-hot")
{
boolbv << onehot_exprt{from_integer(5, u8)}.lower();
THEN("the lowering of onehot is false")
{
REQUIRE(boolbv() == decision_proceduret::resultt::D_UNSATISFIABLE);
}
}
GIVEN("A bit-vector that is not one-hot")
{
boolbv << onehot_exprt{from_integer(0, u8)}.lower();
THEN("the lowering of onehot is false")
{
REQUIRE(boolbv() == decision_proceduret::resultt::D_UNSATISFIABLE);
}
}
GIVEN("A bit-vector that is one-hot 0")
{
boolbv << onehot0_exprt{from_integer(0xfe, u8)}.lower();
THEN("the lowering of onehot0 is true")
{
REQUIRE(boolbv() == decision_proceduret::resultt::D_SATISFIABLE);
}
}
GIVEN("A bit-vector that is not one-hot 0")
{
boolbv << onehot0_exprt{from_integer(0x7e, u8)}.lower();
THEN("the lowering of onehot0 is false")
{
REQUIRE(boolbv() == decision_proceduret::resultt::D_UNSATISFIABLE);
}
}
GIVEN("A bit-vector that is not one-hot 0")
{
boolbv << onehot0_exprt{from_integer(0xff, u8)}.lower();
THEN("the lowering of onehot0 is false")
{
REQUIRE(boolbv() == decision_proceduret::resultt::D_UNSATISFIABLE);
}
}
}
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