def test_it_calls_a_function_with_no_args(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
CALL,
0,
RETURN,
1,
]),
constants=[
W_Function(
name="callee",
arity=0,
bytecode=Bytecode(
name="<the callee's bytecode>",
arguments=(),
variables={},
constants=[W_Int32(42)],
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
RETURN,
1,
]),
),
)
],
name="<test_calls_a_function_with_no_args>",
arguments=(),
variables={},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEqual(rv, W_Int32(42))
def test_binary_leq(self):
byte_code_lt = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
LOAD_CONST,
1,
BINARY_LEQ,
0,
RETURN,
1,
]),
constants=[W_Int32(1), W_Int32(0)],
name="<test_binary_neq>",
arguments=(),
variables={},
)
byte_code_leq = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
LOAD_CONST,
0,
BINARY_LEQ,
0,
RETURN,
1,
]),
constants=[W_Int32(0)],
name="<test_binary_neq>",
arguments=(),
variables={},
)
byte_code_gt = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
LOAD_CONST,
1,
BINARY_LEQ,
0,
RETURN,
1,
]),
constants=[W_Int32(0), W_Int32(1)],
name="<test_binary_neq>",
arguments=(),
variables={},
)
rv = interpreter.CyCy().run(byte_code_lt)
self.assertEqual(rv, W_Bool(True))
rv = interpreter.CyCy().run(byte_code_leq)
self.assertEqual(rv, W_Bool(True))
rv = interpreter.CyCy().run(byte_code_gt)
self.assertEqual(rv, W_Bool(False))
def test_it_can_return_no_value(self):
# this is not the same as a C function returning NULL,
# it is a void C function that has no return value
byte_code = Bytecode(
tape=compiler.Tape(instructions=[RETURN, 0]),
constants=[],
name="<some test bytecode>",
arguments=(),
variables={},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEquals(None, rv)
def test_binary_sub(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST, 0, LOAD_CONST, 1, BINARY_SUB, NO_ARG, RETURN, 1
]),
constants=[W_Int32(1), W_Int32(2)],
name="<test_binary_add>",
arguments=(),
variables={},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEqual(rv, W_Int32(1))
def test_it_handles_load_const(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
RETURN,
1,
]),
constants=[W_Int32(0)],
name="<test_load_const>",
arguments=(),
variables={},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEqual(rv, W_Int32(0))
def test_jump(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
JUMP,
6, # jump to just past LOAD_CONST 1
LOAD_CONST,
1,
RETURN,
1,
]),
constants=[W_Int32(0), W_Int32(1)],
name="<test_array_dereferences>",
arguments=[],
variables={},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEqual(rv, W_Int32(0))
def test_store_and_load_variable(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
STORE_VARIABLE,
0,
LOAD_VARIABLE,
0,
RETURN,
1,
]),
constants=[W_Int32(1)],
name="<test_binary_add>",
arguments=(),
variables={"x": 0},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEqual(rv, W_Int32(1))
def test_it_handles_opcodes_with_args(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
PUTC,
0,
RETURN,
0,
]),
constants=[W_Char("x")],
name="<some test bytecode>",
arguments=(),
variables={},
)
with patch.object(os, "write") as os_write:
interpreter.CyCy().run(byte_code)
os_write.assert_called_once_with(
1, # file descriptor for stdout
"x",
)
def test_array_dereferences(self):
byte_code = Bytecode(
tape=compiler.Tape(instructions=[
LOAD_CONST,
0,
STORE_VARIABLE,
0,
LOAD_CONST,
1,
LOAD_VARIABLE,
0,
DEREFERENCE,
NO_ARG,
RETURN,
1,
]),
constants=[W_String("bar"), W_Int32(1)],
name="<test_array_dereferences>",
arguments=[],
variables={"foo": ""},
)
rv = interpreter.CyCy().run(byte_code)
self.assertEqual(rv, W_Char("a"))