def test_arithmetic_simplify(self):
cs = ConstraintSet()
arr = cs.new_array(name="MEM")
a = cs.new_bitvec(32, name="VARA")
b = cs.new_bitvec(32, name="VARB")
c = a * 2 + b
self.assertEqual(translate_to_smtlib(c), "(bvadd (bvmul VARA #x00000002) VARB)")
self.assertEqual(
translate_to_smtlib((c + 4) - 4),
"(bvsub (bvadd (bvadd (bvmul VARA #x00000002) VARB) #x00000004) #x00000004)",
)
d = c + 4
s = arithmetic_simplify(d - c)
self.assertIsInstance(s, Constant)
self.assertEqual(s.value, 4)
# size = arithmetic_simplify(size
cs2 = ConstraintSet()
exp = cs2.new_bitvec(32)
exp |= 0
exp &= 1
exp |= 0
self.assertEqual(get_depth(exp), 4)
self.assertEqual(
translate_to_smtlib(exp), "(bvor (bvand (bvor BIVEC #x00000000) #x00000001) #x00000000)"
)
exp = arithmetic_simplify(exp)
self.assertTrue(get_depth(exp) < 4)
self.assertEqual(translate_to_smtlib(exp), "(bvand BIVEC #x00000001)")
def test_visitors(self):
solver = Z3Solver.instance()
cs = ConstraintSet()
arr = cs.new_array(name="MEM")
a = cs.new_bitvec(32, name="VAR")
self.assertEqual(get_depth(a), 1)
cond = Operators.AND(a < 200, a > 100)
arr[0] = ord("a")
arr[1] = ord("b")
self.assertEqual(get_depth(cond), 3)
self.assertEqual(get_depth(arr[a + 1]), 4)
self.assertEqual(
translate_to_smtlib(arr[a + 1]),
"(select (store (store MEM #x00000000 #x61) #x00000001 #x62) (bvadd VAR #x00000001))",
)
arr[3] = arr[a + 1]
aux = arr[a + Operators.ZEXTEND(arr[a], 32)]
self.assertEqual(get_depth(aux), 9)
self.maxDiff = 1500
self.assertEqual(
translate_to_smtlib(aux),
"(select (store (store (store MEM #x00000000 #x61) #x00000001 #x62) #x00000003 (select (store (store MEM #x00000000 #x61) #x00000001 #x62) (bvadd VAR #x00000001))) (bvadd VAR ((_ zero_extend 24) (select (store (store (store MEM #x00000000 #x61) #x00000001 #x62) #x00000003 (select (store (store MEM #x00000000 #x61) #x00000001 #x62) (bvadd VAR #x00000001))) VAR))))",
)
values = arr[0:2]
self.assertEqual(len(values), 2)
self.assertItemsEqual(solver.get_all_values(cs, values[0]), [ord("a")])
self.assertItemsEqual(solver.get_all_values(cs, values[1]), [ord("b")])
arr[1:3] = "cd"
values = arr[0:3]
self.assertEqual(len(values), 3)
self.assertItemsEqual(solver.get_all_values(cs, values[0]), [ord("a")])
self.assertItemsEqual(solver.get_all_values(cs, values[1]), [ord("c")])
self.assertItemsEqual(solver.get_all_values(cs, values[2]), [ord("d")])
self.assertEqual(
pretty_print(aux, depth=2),
"ArraySelect\n ArrayStore\n ...\n BitVecAdd\n ...\n")
self.assertEqual(pretty_print(Operators.EXTRACT(a, 0, 8), depth=1),
"BitVecExtract{0:7}\n ...\n")
self.assertEqual(pretty_print(a, depth=2), "VAR\n")
x = BitVecConstant(32, 100, taint=("important", ))
y = BitVecConstant(32, 200, taint=("stuff", ))
z = constant_folder(x + y)
self.assertItemsEqual(z.taint, ("important", "stuff"))
self.assertEqual(z.value, 300)
self.assertRaises(Exception, translate_to_smtlib, 1)
self.assertEqual(
translate_to_smtlib(simplify(Operators.ZEXTEND(a, 32))), "VAR")
self.assertEqual(
translate_to_smtlib(
simplify(Operators.EXTRACT(Operators.EXTRACT(a, 0, 8), 0, 8))),
"((_ extract 7 0) VAR)",
)