def test_unsafe_op_int(get_contract, typ, op):
contract_1 = f"""
@external
def foo(x: {typ}, y: {typ}) -> {typ}:
return unsafe_{op}(x, y)
"""
contract_2 = """
@external
def foo(x: {typ}) -> {typ}:
return unsafe_{op}(x, {literal})
"""
fns = {
"add": operator.add,
"sub": operator.sub,
"mul": operator.mul,
"div": evm_div
}
fn = fns[op]
int_info = parse_integer_typeinfo(typ)
c1 = get_contract(contract_1)
lo, hi = int_bounds(int_info.is_signed, int_info.bits)
# (roughly 8k cases total generated)
# TODO refactor to use fixtures
NUM_CASES = 15
xs = [random.randrange(lo, hi) for _ in range(NUM_CASES)]
ys = [random.randrange(lo, hi) for _ in range(NUM_CASES)]
mod_bound = 2**int_info.bits
# poor man's fuzzing - hypothesis doesn't make it easy
# with the parametrized strategy
if int_info.is_signed:
xs += [lo, lo + 1, -1, 0, 1, hi - 1, hi]
ys += [lo, lo + 1, -1, 0, 1, hi - 1, hi]
for (x, y) in itertools.product(xs, ys):
expected = unsigned_to_signed(fn(x, y) % mod_bound, int_info.bits)
assert c1.foo(x, y) == expected
c2 = get_contract(contract_2.format(typ=typ, op=op, literal=y))
assert c2.foo(x) == expected
else:
# 0x80 has some weird properties, like
# it's a fixed point of multiplication by 0xFF
fixed_pt = 2**(int_info.bits - 1)
xs += [0, 1, hi - 1, hi, fixed_pt]
ys += [0, 1, hi - 1, hi, fixed_pt]
for (x, y) in itertools.product(xs, ys):
expected = fn(x, y) % mod_bound
assert c1.foo(x, y) == expected
c2 = get_contract(contract_2.format(typ=typ, op=op, literal=y))
assert c2.foo(x) == expected
def _signextend(expr, val, arg_typ):
if isinstance(expr, vy_ast.Hex):
assert len(expr.value[2:]) // 2 == arg_typ._bytes_info.m
n_bits = arg_typ._bytes_info.m_bits
else:
assert len(expr.value) == arg_typ.maxlen
n_bits = arg_typ.maxlen * 8
return unsigned_to_signed(val, n_bits)
def _evm_int(node: IRnode, unsigned: bool = True) -> Optional[int]:
if isinstance(node.value, int):
ret = node.value
else:
return None
if unsigned and ret < 0:
return signed_to_unsigned(ret, 256, strict=True)
elif not unsigned and ret > 2**255 - 1:
return unsigned_to_signed(ret, 256, strict=True)
return ret
def _signextend(val_bytes, bits):
as_uint = int.from_bytes(val_bytes, byteorder="big")
as_sint = unsigned_to_signed(as_uint, bits)
return (as_sint % 2**256).to_bytes(32, byteorder="big")
def _wrap256(x, unsigned=UNSIGNED):
x %= 2**256
# wrap in a signed way.
if not unsigned:
x = unsigned_to_signed(x, 256, strict=True)
return x
