def test_load_classderef(self):
concrete = ConcreteBytecode()
concrete.cellvars = ['__class__']
concrete.freevars = ['__class__']
concrete.extend([
ConcreteInstr('LOAD_CLASSDEREF', 1),
ConcreteInstr('STORE_DEREF', 1)
])
bytecode = concrete.to_bytecode()
self.assertEqual(bytecode.freevars, ['__class__'])
self.assertEqual(bytecode.cellvars, ['__class__'])
self.assertEqual(list(bytecode), [
Instr('LOAD_CLASSDEREF', FreeVar('__class__'), lineno=1),
Instr('STORE_DEREF', FreeVar('__class__'), lineno=1)
])
concrete = bytecode.to_concrete_bytecode()
self.assertEqual(concrete.freevars, ['__class__'])
self.assertEqual(concrete.cellvars, ['__class__'])
self.assertEqual(list(concrete), [
ConcreteInstr('LOAD_CLASSDEREF', 1, lineno=1),
ConcreteInstr('STORE_DEREF', 1, lineno=1)
])
code = concrete.to_code()
self.assertEqual(code.co_freevars, ('__class__', ))
self.assertEqual(code.co_cellvars, ('__class__', ))
self.assertEqual(
code.co_code,
b'\x94\x01\x89\x01' if WORDCODE else b'\x94\x01\x00\x89\x01\x00')
def test_get_jump_target(self):
jump_abs = ConcreteInstr("JUMP_ABSOLUTE", 3)
self.assertEqual(jump_abs.get_jump_target(100), 3)
jump_forward = ConcreteInstr("JUMP_FORWARD", 5)
self.assertEqual(jump_forward.get_jump_target(10),
16 if OFFSET_AS_INSTRUCTION else 17)
def test_cellvar_freevar(self):
concrete = ConcreteBytecode()
concrete.cellvars = ["cell"]
concrete.freevars = ["free"]
concrete.append(ConcreteInstr("LOAD_DEREF", 0))
concrete.append(ConcreteInstr("LOAD_DEREF", 1))
code = concrete.to_code()
concrete = ConcreteBytecode.from_code(code)
self.assertEqual(concrete.cellvars, ["cell"])
self.assertEqual(concrete.freevars, ["free"])
self.assertEqual(
list(concrete),
[
ConcreteInstr("LOAD_DEREF", 0, lineno=1),
ConcreteInstr("LOAD_DEREF", 1, lineno=1),
],
)
bytecode = concrete.to_bytecode()
self.assertEqual(bytecode.cellvars, ["cell"])
self.assertEqual(
list(bytecode),
[
Instr("LOAD_DEREF", CellVar("cell"), lineno=1),
Instr("LOAD_DEREF", FreeVar("free"), lineno=1),
],
)
def test_async_gen_no_flag_is_async_None(self):
# Test inference in the absence of any flag set on the bytecode
# Infer generator
code = ConcreteBytecode()
code.append(ConcreteInstr("YIELD_VALUE"))
code.update_flags()
self.assertTrue(bool(code.flags & CompilerFlags.GENERATOR))
# Infer coroutine
code = ConcreteBytecode()
code.append(ConcreteInstr("GET_AWAITABLE"))
code.update_flags()
self.assertTrue(bool(code.flags & CompilerFlags.COROUTINE))
# Infer coroutine or async generator
for i, expected in (
("YIELD_VALUE", CompilerFlags.ASYNC_GENERATOR),
("YIELD_FROM", CompilerFlags.COROUTINE),
):
code = ConcreteBytecode()
code.append(ConcreteInstr("GET_AWAITABLE"))
code.append(ConcreteInstr(i))
code.update_flags()
self.assertTrue(bool(code.flags & expected))
def test_async_gen_flags(self):
# Test inference in the presence of pre-existing flags
for is_async in (None, True):
# Infer generator
code = ConcreteBytecode()
code.append(ConcreteInstr("YIELD_VALUE"))
for f, expected in (
(CompilerFlags.COROUTINE, CompilerFlags.ASYNC_GENERATOR),
(CompilerFlags.ASYNC_GENERATOR, CompilerFlags.ASYNC_GENERATOR),
(CompilerFlags.ITERABLE_COROUTINE, CompilerFlags.ITERABLE_COROUTINE),
):
code.flags = CompilerFlags(f)
code.update_flags(is_async=is_async)
self.assertTrue(bool(code.flags & expected))
# Infer coroutine
code = ConcreteBytecode()
code.append(ConcreteInstr("YIELD_FROM"))
for f, expected in (
(CompilerFlags.COROUTINE, CompilerFlags.COROUTINE),
(CompilerFlags.ASYNC_GENERATOR, CompilerFlags.COROUTINE),
(CompilerFlags.ITERABLE_COROUTINE, CompilerFlags.ITERABLE_COROUTINE),
):
code.flags = CompilerFlags(f)
code.update_flags(is_async=is_async)
self.assertTrue(bool(code.flags & expected))
# Crash on ITERABLE_COROUTINE with async bytecode
code = ConcreteBytecode()
code.append(ConcreteInstr("GET_AWAITABLE"))
code.flags = CompilerFlags(CompilerFlags.ITERABLE_COROUTINE)
with self.assertRaises(ValueError):
code.update_flags(is_async=is_async)
def test_extended_lnotab(self):
# x = 7
# y = 8
concrete = ConcreteBytecode([
ConcreteInstr("LOAD_CONST", 0),
SetLineno(1 + 128),
ConcreteInstr("STORE_NAME", 0),
# line number goes backward!
SetLineno(1 + 129),
ConcreteInstr("LOAD_CONST", 1),
SetLineno(1),
ConcreteInstr("STORE_NAME", 1),
])
concrete.consts = [7, 8]
concrete.names = ["x", "y"]
concrete.first_lineno = 1
if sys.version_info >= (3, 6):
code = concrete.to_code()
expected = b"d\x00Z\x00d\x01Z\x01"
self.assertEqual(code.co_code, expected)
self.assertEqual(code.co_firstlineno, 1)
self.assertEqual(code.co_lnotab,
b"\x00\x7f\x02\x01\x02\x01\x00\x80\x02\xff")
else:
with self.assertRaises(ValueError) as cm:
code = concrete.to_code()
self.assertEqual(
str(cm.exception),
"negative line number delta is not supported "
"on Python < 3.6",
)
def test_negative_lnotab(self):
# x = 7
# y = 8
concrete = ConcreteBytecode([
ConcreteInstr("LOAD_CONST", 0),
ConcreteInstr("STORE_NAME", 0),
# line number goes backward!
SetLineno(2),
ConcreteInstr("LOAD_CONST", 1),
ConcreteInstr("STORE_NAME", 1)
])
concrete.consts = [7, 8]
concrete.names = ['x', 'y']
concrete.first_lineno = 5
if sys.version_info >= (3, 6):
code = concrete.to_code()
expected = b'd\x00Z\x00d\x01Z\x01'
self.assertEqual(code.co_code, expected)
self.assertEqual(code.co_firstlineno, 5)
self.assertEqual(code.co_lnotab, b'\x04\xfd')
else:
with self.assertRaises(ValueError) as cm:
code = concrete.to_code()
self.assertEqual(str(cm.exception),
"negative line number delta is not supported "
"on Python < 3.6")
def test_get_jump_target(self):
jump_abs = ConcreteInstr("JUMP_ABSOLUTE", 3)
self.assertEqual(jump_abs.get_jump_target(100), 3)
jump_forward = ConcreteInstr("JUMP_FORWARD", 5)
self.assertEqual(jump_forward.get_jump_target(10),
17 if WORDCODE else 18)
def test_assemble(self):
instr = ConcreteInstr("NOP")
self.assertEqual(instr.assemble(), b'\t')
instr = ConcreteInstr("LOAD_CONST", 3)
self.assertEqual(instr.assemble(), b'd\x03\x00')
instr = ConcreteInstr("LOAD_CONST", 0x1234abcd)
self.assertEqual(instr.assemble(), b'\x904\x12d\xcd\xab')
def test_label2(self):
bytecode = Bytecode()
label = Label()
bytecode.extend(
[
Instr("LOAD_NAME", "test", lineno=1),
Instr("POP_JUMP_IF_FALSE", label),
Instr("LOAD_CONST", 5, lineno=2),
Instr("STORE_NAME", "x"),
Instr("JUMP_FORWARD", label),
Instr("LOAD_CONST", 7, lineno=4),
Instr("STORE_NAME", "x"),
label,
Instr("LOAD_CONST", None),
Instr("RETURN_VALUE"),
]
)
concrete = bytecode.to_concrete_bytecode()
expected = [
ConcreteInstr("LOAD_NAME", 0, lineno=1),
ConcreteInstr("POP_JUMP_IF_FALSE", 14, lineno=1),
ConcreteInstr("LOAD_CONST", 0, lineno=2),
ConcreteInstr("STORE_NAME", 1, lineno=2),
ConcreteInstr("JUMP_FORWARD", 4, lineno=2),
ConcreteInstr("LOAD_CONST", 1, lineno=4),
ConcreteInstr("STORE_NAME", 1, lineno=4),
ConcreteInstr("LOAD_CONST", 2, lineno=4),
ConcreteInstr("RETURN_VALUE", lineno=4),
]
self.assertListEqual(list(concrete), expected)
self.assertListEqual(concrete.consts, [5, 7, None])
self.assertListEqual(concrete.names, ["test", "x"])
self.assertListEqual(concrete.varnames, [])
def test_constructor(self):
with self.assertRaises(ValueError):
# need an argument
ConcreteInstr("LOAD_CONST")
with self.assertRaises(ValueError):
# must not have an argument
ConcreteInstr("ROT_TWO", 33)
# invalid argument
with self.assertRaises(TypeError):
ConcreteInstr("LOAD_CONST", 1.0)
with self.assertRaises(ValueError):
ConcreteInstr("LOAD_CONST", -1)
with self.assertRaises(TypeError):
ConcreteInstr("LOAD_CONST", 5, lineno=1.0)
with self.assertRaises(ValueError):
ConcreteInstr("LOAD_CONST", 5, lineno=-1)
# test maximum argument
with self.assertRaises(ValueError):
ConcreteInstr("LOAD_CONST", 2147483647 + 1)
instr = ConcreteInstr("LOAD_CONST", 2147483647)
self.assertEqual(instr.arg, 2147483647)
# test meaningless extended args
instr = ConcreteInstr("LOAD_FAST", 8, lineno=3, extended_args=1)
self.assertEqual(instr.name, "LOAD_FAST")
self.assertEqual(instr.arg, 8)
self.assertEqual(instr.lineno, 3)
self.assertEqual(instr.size, 4)
def test_label2(self):
bytecode = Bytecode()
label = Label()
bytecode.extend([
Instr('LOAD_NAME', 'test', lineno=1),
Instr('POP_JUMP_IF_FALSE', label),
Instr('LOAD_CONST', 5, lineno=2),
Instr('STORE_NAME', 'x'),
Instr('JUMP_FORWARD', label),
Instr('LOAD_CONST', 7, lineno=4),
Instr('STORE_NAME', 'x'), label,
Instr('LOAD_CONST', None),
Instr('RETURN_VALUE')
])
concrete = bytecode.to_concrete_bytecode()
expected = [
ConcreteInstr('LOAD_NAME', 0, lineno=1),
ConcreteInstr('POP_JUMP_IF_FALSE',
14 if WORDCODE else 21,
lineno=1),
ConcreteInstr('LOAD_CONST', 0, lineno=2),
ConcreteInstr('STORE_NAME', 1, lineno=2),
ConcreteInstr('JUMP_FORWARD', 4 if WORDCODE else 6, lineno=2),
ConcreteInstr('LOAD_CONST', 1, lineno=4),
ConcreteInstr('STORE_NAME', 1, lineno=4),
ConcreteInstr('LOAD_CONST', 2, lineno=4),
ConcreteInstr('RETURN_VALUE', lineno=4)
]
self.assertListEqual(list(concrete), expected)
self.assertListEqual(concrete.consts, [5, 7, None])
self.assertListEqual(concrete.names, ['test', 'x'])
self.assertListEqual(concrete.varnames, [])
def test_flag_inference(self):
# Check no loss of non-infered flags
code = ControlFlowGraph()
code.flags |= (CompilerFlags.NEWLOCALS | CompilerFlags.VARARGS
| CompilerFlags.VARKEYWORDS | CompilerFlags.NESTED
| CompilerFlags.FUTURE_GENERATOR_STOP)
code.update_flags()
for f in (CompilerFlags.NEWLOCALS, CompilerFlags.VARARGS,
CompilerFlags.VARKEYWORDS, CompilerFlags.NESTED,
CompilerFlags.NOFREE, CompilerFlags.OPTIMIZED,
CompilerFlags.FUTURE_GENERATOR_STOP):
self.assertTrue(bool(code.flags & f))
# Infer optimized and nofree
code = Bytecode()
flags = infer_flags(code)
self.assertTrue(bool(flags & CompilerFlags.OPTIMIZED))
self.assertTrue(bool(flags & CompilerFlags.NOFREE))
code.append(ConcreteInstr('STORE_NAME', 1))
flags = infer_flags(code)
self.assertFalse(bool(flags & CompilerFlags.OPTIMIZED))
self.assertTrue(bool(flags & CompilerFlags.NOFREE))
code.append(ConcreteInstr('STORE_DEREF', 2))
code.update_flags()
self.assertFalse(bool(code.flags & CompilerFlags.OPTIMIZED))
self.assertFalse(bool(code.flags & CompilerFlags.NOFREE))
# Infer generator
code = ConcreteBytecode()
code.append(ConcreteInstr('YIELD_VALUE'))
for is_async, expected in ((False, CompilerFlags.GENERATOR),
(True, CompilerFlags.ASYNC_GENERATOR)):
self.assertTrue(bool(infer_flags(code, is_async) & expected))
# Infer coroutine
code = ConcreteBytecode()
code.append(ConcreteInstr('GET_AWAITABLE'))
iter_flags = CompilerFlags(CompilerFlags.ITERABLE_COROUTINE)
for f, expected in ((CompilerFlags(0), True), (iter_flags, False)):
code.flags = f
self.assertEqual(bool(infer_flags(code) & CompilerFlags.COROUTINE),
expected)
# Test check flag sanity
code.append(ConcreteInstr('YIELD_VALUE'))
code.flags = CompilerFlags(CompilerFlags.GENERATOR
| CompilerFlags.COROUTINE)
infer_flags(code, is_async=True) # Just want to be sure it pases
with self.assertRaises(ValueError):
code.update_flags()
with self.assertRaises(ValueError):
infer_flags(None)
def test_disassemble(self):
instr = ConcreteInstr.disassemble(1, b'\td\x03\x00', 0)
self.assertEqual(instr, ConcreteInstr("NOP", lineno=1))
instr = ConcreteInstr.disassemble(2, b'\td\x03\x00', 1)
self.assertEqual(instr, ConcreteInstr("LOAD_CONST", 3, lineno=2))
code = b'\x904\x12d\xcd\xab'
instr = ConcreteInstr.disassemble(3, code, 0)
self.assertEqual(instr, ConcreteInstr('EXTENDED_ARG', 0x1234,
lineno=3))
def test_cellvars(self):
code = Bytecode()
code.cellvars = ['x']
code.freevars = ['y']
code.extend([Instr('LOAD_DEREF', CellVar('x'), lineno=1),
Instr('LOAD_DEREF', FreeVar('y'), lineno=1)])
concrete = code.to_concrete_bytecode()
self.assertEqual(concrete.cellvars, ['x'])
self.assertEqual(concrete.freevars, ['y'])
code.extend([ConcreteInstr("LOAD_DEREF", 0, lineno=1),
ConcreteInstr("LOAD_DEREF", 1, lineno=1)])
def test_disassemble(self):
code = b"\t\x00d\x03"
instr = ConcreteInstr.disassemble(1, code, 0)
self.assertEqual(instr, ConcreteInstr("NOP", lineno=1))
instr = ConcreteInstr.disassemble(2, code, 2)
self.assertEqual(instr, ConcreteInstr("LOAD_CONST", 3, lineno=2))
code = b"\x90\x12\x904\x90\xabd\xcd"
instr = ConcreteInstr.disassemble(3, code, 0)
self.assertEqual(instr, ConcreteInstr("EXTENDED_ARG", 0x12, lineno=3))
def test_disassemble(self):
code = b'\t\x00d\x03' if WORDCODE else b'\td\x03\x00'
instr = ConcreteInstr.disassemble(1, code, 0)
self.assertEqual(instr, ConcreteInstr("NOP", lineno=1))
instr = ConcreteInstr.disassemble(2, code, 2 if WORDCODE else 1)
self.assertEqual(instr, ConcreteInstr("LOAD_CONST", 3, lineno=2))
code = b'\x90\x12\x904\x90\xabd\xcd' if WORDCODE else b'\x904\x12d\xcd\xab'
instr = ConcreteInstr.disassemble(3, code, 0)
self.assertEqual(instr,
ConcreteInstr('EXTENDED_ARG', 0x12 if WORDCODE else 0x1234, lineno=3))
def test_attr(self):
code_obj = get_code("x = 5")
code = ConcreteBytecode.from_code(code_obj)
self.assertEqual(code.consts, [5, None])
self.assertEqual(code.names, ['x'])
self.assertEqual(code.varnames, [])
self.assertEqual(code.freevars, [])
self.assertListEqual(list(code),
[ConcreteInstr('LOAD_CONST', 0, lineno=1),
ConcreteInstr('STORE_NAME', 0, lineno=1),
ConcreteInstr('LOAD_CONST', 1, lineno=1),
ConcreteInstr('RETURN_VALUE', lineno=1)])
def test_disassemble(self):
code = b"\td\x03\x00"
instr = ConcreteInstr.disassemble(1, code, 0)
self.assertEqual(instr, ConcreteInstr("NOP", lineno=1))
instr = ConcreteInstr.disassemble(2, code, 1)
self.assertEqual(instr, ConcreteInstr("LOAD_CONST", 3, lineno=2))
code = b"%c4\x12d\xcd\xab" % EXTENDED_ARG
instr = ConcreteInstr.disassemble(3, code, 0)
self.assertEqual(instr, ConcreteInstr("EXTENDED_ARG", 0x1234,
lineno=3))
def test_to_code_lnotab(self):
# We use an actual function for the simple case to
# ensure we get lnotab right
def f():
#
#
x = 7 # noqa
y = 8 # noqa
z = 9 # noqa
fl = f.__code__.co_firstlineno
concrete = ConcreteBytecode()
concrete.consts = [None, 7, 8, 9]
concrete.varnames = ["x", "y", "z"]
concrete.first_lineno = fl
concrete.extend([
SetLineno(fl + 3),
ConcreteInstr("LOAD_CONST", 1),
ConcreteInstr("STORE_FAST", 0),
SetLineno(fl + 4),
ConcreteInstr("LOAD_CONST", 2),
ConcreteInstr("STORE_FAST", 1),
SetLineno(fl + 5),
ConcreteInstr("LOAD_CONST", 3),
ConcreteInstr("STORE_FAST", 2),
ConcreteInstr("LOAD_CONST", 0),
ConcreteInstr("RETURN_VALUE"),
])
code = concrete.to_code()
self.assertEqual(code.co_code, f.__code__.co_code)
self.assertEqual(code.co_lnotab, f.__code__.co_lnotab)
if sys.version_info >= (3, 10):
self.assertEqual(code.co_linetable, f.__code__.co_linetable)
def test_freevar(self):
concrete = ConcreteBytecode()
concrete.freevars = ["x"]
concrete.append(ConcreteInstr("LOAD_DEREF", 0))
code = concrete.to_code()
concrete = ConcreteBytecode.from_code(code)
self.assertEqual(concrete.cellvars, [])
self.assertEqual(concrete.freevars, ["x"])
self.assertEqual(list(concrete), [ConcreteInstr("LOAD_DEREF", 0, lineno=1)])
bytecode = concrete.to_bytecode()
self.assertEqual(bytecode.cellvars, [])
self.assertEqual(list(bytecode), [Instr("LOAD_DEREF", FreeVar("x"), lineno=1)])
def test_label(self):
code = Bytecode()
label = Label()
code.extend([Instr('LOAD_CONST', 'hello', lineno=1),
Instr('JUMP_FORWARD', label, lineno=1),
label,
Instr('POP_TOP', lineno=1)])
code = code.to_concrete_bytecode()
expected = [ConcreteInstr('LOAD_CONST', 0, lineno=1),
ConcreteInstr('JUMP_FORWARD', 0, lineno=1),
ConcreteInstr('POP_TOP', lineno=1)]
self.assertListEqual(list(code), expected)
self.assertListEqual(code.consts, ['hello'])
def test_cellvars(self):
code = Bytecode()
code.cellvars = ["x"]
code.freevars = ["y"]
code.extend([
Instr("LOAD_DEREF", CellVar("x"), lineno=1),
Instr("LOAD_DEREF", FreeVar("y"), lineno=1),
])
concrete = code.to_concrete_bytecode()
self.assertEqual(concrete.cellvars, ["x"])
self.assertEqual(concrete.freevars, ["y"])
code.extend([
ConcreteInstr("LOAD_DEREF", 0, lineno=1),
ConcreteInstr("LOAD_DEREF", 1, lineno=1),
])
def test_dont_merge_constants(self):
# test two constants which are equal but have a different type
code = Bytecode()
code.extend([Instr('LOAD_CONST', 5, lineno=1),
Instr('LOAD_CONST', 5.0, lineno=1),
Instr('LOAD_CONST', -0.0, lineno=1),
Instr('LOAD_CONST', +0.0, lineno=1)])
code = code.to_concrete_bytecode()
expected = [ConcreteInstr('LOAD_CONST', 0, lineno=1),
ConcreteInstr('LOAD_CONST', 1, lineno=1),
ConcreteInstr('LOAD_CONST', 2, lineno=1),
ConcreteInstr('LOAD_CONST', 3, lineno=1)]
self.assertListEqual(list(code), expected)
self.assertListEqual(code.consts, [5, 5.0, -0.0, +0.0])
def test_attr(self):
instr = ConcreteInstr("LOAD_CONST", 5, lineno=12)
self.assertEqual(instr.name, "LOAD_CONST")
self.assertEqual(instr.opcode, 100)
self.assertEqual(instr.arg, 5)
self.assertEqual(instr.lineno, 12)
self.assertEqual(instr.size, 2)
def test_async_gen_no_flag_is_async_False(self):
# Test inference when we request a non-async function
# Infer generator
code = ConcreteBytecode()
code.append(ConcreteInstr("YIELD_VALUE"))
code.flags = CompilerFlags(CompilerFlags.COROUTINE)
code.update_flags(is_async=False)
self.assertTrue(bool(code.flags & CompilerFlags.GENERATOR))
# Abort on coroutine
code = ConcreteBytecode()
code.append(ConcreteInstr("GET_AWAITABLE"))
code.flags = CompilerFlags(CompilerFlags.COROUTINE)
with self.assertRaises(ValueError):
code.update_flags(is_async=False)
def test_attr(self):
code_obj = get_code("x = 5")
code = ConcreteBytecode.from_code(code_obj)
self.assertEqual(code.consts, [5, None])
self.assertEqual(code.names, ["x"])
self.assertEqual(code.varnames, [])
self.assertEqual(code.freevars, [])
self.assertListEqual(
list(code),
[
ConcreteInstr("LOAD_CONST", 0, lineno=1),
ConcreteInstr("STORE_NAME", 0, lineno=1),
ConcreteInstr("LOAD_CONST", 1, lineno=1),
ConcreteInstr("RETURN_VALUE", lineno=1),
],
)
def test_eq(self):
code = ConcreteBytecode()
self.assertFalse(code == 1)
for name, val in (
("names", ["a"]),
("varnames", ["a"]),
("consts", [1]),
("argcount", 1),
("kwonlyargcount", 2),
("flags", CompilerFlags(CompilerFlags.GENERATOR)),
("first_lineno", 10),
("filename", "xxxx.py"),
("name", "__x"),
("docstring", "x-x-x"),
("cellvars", [CellVar("x")]),
("freevars", [FreeVar("x")]),
):
c = ConcreteBytecode()
setattr(c, name, val)
# For obscure reasons using assertNotEqual here fail
self.assertFalse(code == c)
if sys.version_info > (3, 8):
c = ConcreteBytecode()
c.posonlyargcount = 10
self.assertFalse(code == c)
c = ConcreteBytecode()
c.consts = [1]
code.consts = [1]
c.append(ConcreteInstr("LOAD_CONST", 0))
self.assertFalse(code == c)
def test_cellvar(self):
concrete = ConcreteBytecode()
concrete.cellvars = ['x']
concrete.append(ConcreteInstr('LOAD_DEREF', 0))
code = concrete.to_code()
concrete = ConcreteBytecode.from_code(code)
self.assertEqual(concrete.cellvars, ['x'])
self.assertEqual(concrete.freevars, [])
self.assertEqual(list(concrete),
[ConcreteInstr('LOAD_DEREF', 0, lineno=1)])
bytecode = concrete.to_bytecode()
self.assertEqual(bytecode.cellvars, ['x'])
self.assertEqual(list(bytecode),
[Instr('LOAD_DEREF', CellVar('x'), lineno=1)])
def test_assemble(self):
instr = ConcreteInstr("NOP")
self.assertEqual(instr.assemble(), b'\t\x00' if WORDCODE else b'\t')
instr = ConcreteInstr("LOAD_CONST", 3)
self.assertEqual(instr.assemble(),
b'd\x03' if WORDCODE else b'd\x03\x00')
instr = ConcreteInstr("LOAD_CONST", 0x1234abcd)
self.assertEqual(instr.assemble(),
(b'\x90\x12\x904\x90\xabd\xcd'
if WORDCODE else b'\x904\x12d\xcd\xab'))
instr = ConcreteInstr("LOAD_CONST", 3, extended_args=1)
self.assertEqual(
instr.assemble(),
(b'\x90\x00d\x03' if WORDCODE else b'\x90\x00\x00d\x03\x00'))
