def test_hash_on_str_creation(self):
# In cPython some? new strings do not have a cached hash until hash() is
# called
def impl(do_hash):
const1 = "aaaa"
const2 = "ую╝ую╝ую╝ую╝"
new = const1 + const2
if do_hash:
hash(new)
return new
jitted = jit(nopython=True)(impl)
# do not compute the hash, cPython will have no cached hash, but Numba
# will
compute_hash = False
expected = impl(compute_hash)
got = jitted(compute_hash)
a = (compile_time_get_string_data(expected))
b = (compile_time_get_string_data(got))
self.assertEqual(a[:-1], b[:-1])
self.assertTrue(a[-1] != b[-1])
# now with compute hash enabled, cPython will have a cached hash as will
# Numba
compute_hash = True
expected = impl(compute_hash)
got = jitted(compute_hash)
a = (compile_time_get_string_data(expected))
b = (compile_time_get_string_data(got))
self.assertEqual(a, b)
def test_hash_literal(self):
# a strconst always seem to have an associated hash value so the hash
# member of the returned value should contain the correct hash
@jit(nopython=True)
def fn():
x = "abcdefghijklmnopqrstuvwxyz"
return x
val = fn()
tmp = hash("abcdefghijklmnopqrstuvwxyz")
self.assertEqual(tmp, (compile_time_get_string_data(val)[-1]))
def test_hash_passthrough_call(self):
# check `x._hash` and hash(x) are the same
kind1_string = "abcdefghijklmnopqrstuvwxyz"
@jit(nopython=True)
def fn(x):
return x._hash, hash(x)
hash_value = compile_time_get_string_data(kind1_string)[-1]
self.assertTrue(hash_value != -1)
self.assertEqual(fn(kind1_string), (hash_value, hash_value))
def test_hash_passthrough(self):
# no `hash` call made, this just checks that `._hash` is correctly
# passed through from an already existing string
kind1_string = "abcdefghijklmnopqrstuvwxyz"
@jit(nopython=True)
def fn(x):
return x._hash
hash_value = compile_time_get_string_data(kind1_string)[-1]
self.assertTrue(hash_value != -1)
self.assertEqual(fn(kind1_string), hash_value)
