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test_dis.py
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# Minimal tests for dis module
import contextlib
import dis
import functools
import io
import re
import sys
import types
import unittest
from test.support import (captured_stdout, requires_debug_ranges,
requires_specialization, cpython_only)
from test.support.bytecode_helper import BytecodeTestCase
import opcode
CACHE = dis.opmap["CACHE"]
def get_tb():
def _error():
try:
1 / 0
except Exception as e:
tb = e.__traceback__
return tb
tb = _error()
while tb.tb_next:
tb = tb.tb_next
return tb
TRACEBACK_CODE = get_tb().tb_frame.f_code
class _C:
def __init__(self, x):
self.x = x == 1
@staticmethod
def sm(x):
x = x == 1
@classmethod
def cm(cls, x):
cls.x = x == 1
dis_c_instance_method = """\
%3d RESUME 0
%3d LOAD_FAST 1 (x)
LOAD_CONST 1 (1)
COMPARE_OP 72 (==)
LOAD_FAST 0 (self)
STORE_ATTR 0 (x)
RETURN_CONST 0 (None)
""" % (_C.__init__.__code__.co_firstlineno, _C.__init__.__code__.co_firstlineno + 1,)
dis_c_instance_method_bytes = """\
RESUME 0
LOAD_FAST 1
LOAD_CONST 1
COMPARE_OP 72 (==)
LOAD_FAST 0
STORE_ATTR 0
RETURN_CONST 0
"""
dis_c_class_method = """\
%3d RESUME 0
%3d LOAD_FAST 1 (x)
LOAD_CONST 1 (1)
COMPARE_OP 72 (==)
LOAD_FAST 0 (cls)
STORE_ATTR 0 (x)
RETURN_CONST 0 (None)
""" % (_C.cm.__code__.co_firstlineno, _C.cm.__code__.co_firstlineno + 2,)
dis_c_static_method = """\
%3d RESUME 0
%3d LOAD_FAST 0 (x)
LOAD_CONST 1 (1)
COMPARE_OP 72 (==)
STORE_FAST 0 (x)
RETURN_CONST 0 (None)
""" % (_C.sm.__code__.co_firstlineno, _C.sm.__code__.co_firstlineno + 2,)
# Class disassembling info has an extra newline at end.
dis_c = """\
Disassembly of %s:
%s
Disassembly of %s:
%s
Disassembly of %s:
%s
""" % (_C.__init__.__name__, dis_c_instance_method,
_C.cm.__name__, dis_c_class_method,
_C.sm.__name__, dis_c_static_method)
def _f(a):
print(a)
return 1
dis_f = """\
%3d RESUME 0
%3d LOAD_GLOBAL 1 (print + NULL)
LOAD_FAST 0 (a)
CALL 1
POP_TOP
%3d RETURN_CONST 1 (1)
""" % (_f.__code__.co_firstlineno,
_f.__code__.co_firstlineno + 1,
_f.__code__.co_firstlineno + 2)
dis_f_with_offsets = """\
%3d 0 RESUME 0
%3d 2 LOAD_GLOBAL 1 (print + NULL)
12 LOAD_FAST 0 (a)
14 CALL 1
22 POP_TOP
%3d 24 RETURN_CONST 1 (1)
""" % (_f.__code__.co_firstlineno,
_f.__code__.co_firstlineno + 1,
_f.__code__.co_firstlineno + 2)
dis_f_co_code = """\
RESUME 0
LOAD_GLOBAL 1
LOAD_FAST 0
CALL 1
POP_TOP
RETURN_CONST 1
"""
def bug708901():
for res in range(1,
10):
pass
dis_bug708901 = """\
%3d RESUME 0
%3d LOAD_GLOBAL 1 (range + NULL)
LOAD_CONST 1 (1)
%3d LOAD_CONST 2 (10)
%3d CALL 2
GET_ITER
L1: FOR_ITER 3 (to L2)
STORE_FAST 0 (res)
%3d JUMP_BACKWARD 5 (to L1)
%3d L2: END_FOR
RETURN_CONST 0 (None)
""" % (bug708901.__code__.co_firstlineno,
bug708901.__code__.co_firstlineno + 1,
bug708901.__code__.co_firstlineno + 2,
bug708901.__code__.co_firstlineno + 1,
bug708901.__code__.co_firstlineno + 3,
bug708901.__code__.co_firstlineno + 1)
def bug1333982(x=[]):
assert 0, ((s for s in x) +
1)
pass
dis_bug1333982 = """\
%3d RESUME 0
%3d LOAD_ASSERTION_ERROR
LOAD_CONST 1 (<code object <genexpr> at 0x..., file "%s", line %d>)
MAKE_FUNCTION
LOAD_FAST 0 (x)
GET_ITER
CALL 0
%3d LOAD_CONST 2 (1)
%3d BINARY_OP 0 (+)
CALL 0
RAISE_VARARGS 1
""" % (bug1333982.__code__.co_firstlineno,
bug1333982.__code__.co_firstlineno + 1,
__file__,
bug1333982.__code__.co_firstlineno + 1,
bug1333982.__code__.co_firstlineno + 2,
bug1333982.__code__.co_firstlineno + 1)
def bug42562():
pass
# Set line number for 'pass' to None
bug42562.__code__ = bug42562.__code__.replace(co_linetable=b'\xf8')
dis_bug42562 = """\
RESUME 0
RETURN_CONST 0 (None)
"""
# Extended arg followed by NOP
code_bug_45757 = bytes([
opcode.opmap['EXTENDED_ARG'], 0x01, # EXTENDED_ARG 0x01
opcode.opmap['NOP'], 0xFF, # NOP 0xFF
opcode.opmap['EXTENDED_ARG'], 0x01, # EXTENDED_ARG 0x01
opcode.opmap['LOAD_CONST'], 0x29, # LOAD_CONST 0x29
opcode.opmap['RETURN_VALUE'], 0x00, # RETURN_VALUE 0x00
])
dis_bug_45757 = """\
EXTENDED_ARG 1
NOP
EXTENDED_ARG 1
LOAD_CONST 297
RETURN_VALUE
"""
# [255, 255, 255, 252] is -4 in a 4 byte signed integer
bug46724 = bytes([
opcode.EXTENDED_ARG, 255,
opcode.EXTENDED_ARG, 255,
opcode.EXTENDED_ARG, 255,
opcode.opmap['JUMP_FORWARD'], 252,
])
dis_bug46724 = """\
L1: EXTENDED_ARG 255
EXTENDED_ARG 65535
EXTENDED_ARG 16777215
JUMP_FORWARD -4 (to L1)
"""
def func_w_kwargs(a, b, **c):
pass
def wrap_func_w_kwargs():
func_w_kwargs(1, 2, c=5)
dis_kw_names = """\
%3d RESUME 0
%3d LOAD_GLOBAL 1 (func_w_kwargs + NULL)
LOAD_CONST 1 (1)
LOAD_CONST 2 (2)
LOAD_CONST 3 (5)
LOAD_CONST 4 (('c',))
CALL_KW 3
POP_TOP
RETURN_CONST 0 (None)
""" % (wrap_func_w_kwargs.__code__.co_firstlineno,
wrap_func_w_kwargs.__code__.co_firstlineno + 1)
dis_intrinsic_1_2 = """\
0 RESUME 0
1 LOAD_CONST 0 (0)
LOAD_CONST 1 (('*',))
IMPORT_NAME 0 (math)
CALL_INTRINSIC_1 2 (INTRINSIC_IMPORT_STAR)
POP_TOP
RETURN_CONST 2 (None)
"""
dis_intrinsic_1_5 = """\
0 RESUME 0
1 LOAD_NAME 0 (a)
CALL_INTRINSIC_1 5 (INTRINSIC_UNARY_POSITIVE)
RETURN_VALUE
"""
dis_intrinsic_1_6 = """\
0 RESUME 0
1 BUILD_LIST 0
LOAD_NAME 0 (a)
LIST_EXTEND 1
CALL_INTRINSIC_1 6 (INTRINSIC_LIST_TO_TUPLE)
RETURN_VALUE
"""
_BIG_LINENO_FORMAT = """\
1 RESUME 0
%3d LOAD_GLOBAL 0 (spam)
POP_TOP
RETURN_CONST 0 (None)
"""
_BIG_LINENO_FORMAT2 = """\
1 RESUME 0
%4d LOAD_GLOBAL 0 (spam)
POP_TOP
RETURN_CONST 0 (None)
"""
dis_module_expected_results = """\
Disassembly of f:
4 RESUME 0
RETURN_CONST 0 (None)
Disassembly of g:
5 RESUME 0
RETURN_CONST 0 (None)
"""
expr_str = "x + 1"
dis_expr_str = """\
0 RESUME 0
1 LOAD_NAME 0 (x)
LOAD_CONST 0 (1)
BINARY_OP 0 (+)
RETURN_VALUE
"""
simple_stmt_str = "x = x + 1"
dis_simple_stmt_str = """\
0 RESUME 0
1 LOAD_NAME 0 (x)
LOAD_CONST 0 (1)
BINARY_OP 0 (+)
STORE_NAME 0 (x)
RETURN_CONST 1 (None)
"""
annot_stmt_str = """\
x: int = 1
y: fun(1)
lst[fun(0)]: int = 1
"""
# leading newline is for a reason (tests lineno)
dis_annot_stmt_str = """\
0 RESUME 0
2 SETUP_ANNOTATIONS
LOAD_CONST 0 (1)
STORE_NAME 0 (x)
LOAD_NAME 1 (int)
LOAD_NAME 2 (__annotations__)
LOAD_CONST 1 ('x')
STORE_SUBSCR
3 LOAD_NAME 3 (fun)
PUSH_NULL
LOAD_CONST 0 (1)
CALL 1
LOAD_NAME 2 (__annotations__)
LOAD_CONST 2 ('y')
STORE_SUBSCR
4 LOAD_CONST 0 (1)
LOAD_NAME 4 (lst)
LOAD_NAME 3 (fun)
PUSH_NULL
LOAD_CONST 3 (0)
CALL 1
STORE_SUBSCR
LOAD_NAME 1 (int)
POP_TOP
RETURN_CONST 4 (None)
"""
compound_stmt_str = """\
x = 0
while 1:
x += 1"""
# Trailing newline has been deliberately omitted
dis_compound_stmt_str = """\
0 RESUME 0
1 LOAD_CONST 0 (0)
STORE_NAME 0 (x)
2 NOP
3 L1: LOAD_NAME 0 (x)
LOAD_CONST 1 (1)
BINARY_OP 13 (+=)
STORE_NAME 0 (x)
2 JUMP_BACKWARD 7 (to L1)
"""
dis_traceback = """\
%4d RESUME 0
%4d NOP
%4d L1: LOAD_CONST 1 (1)
LOAD_CONST 2 (0)
--> BINARY_OP 11 (/)
POP_TOP
%4d L2: LOAD_FAST_CHECK 1 (tb)
RETURN_VALUE
-- L3: PUSH_EXC_INFO
%4d LOAD_GLOBAL 0 (Exception)
CHECK_EXC_MATCH
POP_JUMP_IF_FALSE 23 (to L7)
STORE_FAST 0 (e)
%4d L4: LOAD_FAST 0 (e)
LOAD_ATTR 2 (__traceback__)
STORE_FAST 1 (tb)
L5: POP_EXCEPT
LOAD_CONST 0 (None)
STORE_FAST 0 (e)
DELETE_FAST 0 (e)
%4d LOAD_FAST 1 (tb)
RETURN_VALUE
-- L6: LOAD_CONST 0 (None)
STORE_FAST 0 (e)
DELETE_FAST 0 (e)
RERAISE 1
%4d L7: RERAISE 0
-- L8: COPY 3
POP_EXCEPT
RERAISE 1
ExceptionTable:
L1 to L2 -> L3 [0]
L3 to L4 -> L8 [1] lasti
L4 to L5 -> L6 [1] lasti
L6 to L8 -> L8 [1] lasti
""" % (TRACEBACK_CODE.co_firstlineno,
TRACEBACK_CODE.co_firstlineno + 1,
TRACEBACK_CODE.co_firstlineno + 2,
TRACEBACK_CODE.co_firstlineno + 5,
TRACEBACK_CODE.co_firstlineno + 3,
TRACEBACK_CODE.co_firstlineno + 4,
TRACEBACK_CODE.co_firstlineno + 5,
TRACEBACK_CODE.co_firstlineno + 3)
def _fstring(a, b, c, d):
return f'{a} {b:4} {c!r} {d!r:4}'
dis_fstring = """\
%3d RESUME 0
%3d LOAD_FAST 0 (a)
FORMAT_SIMPLE
LOAD_CONST 1 (' ')
LOAD_FAST 1 (b)
LOAD_CONST 2 ('4')
FORMAT_WITH_SPEC
LOAD_CONST 1 (' ')
LOAD_FAST 2 (c)
CONVERT_VALUE 2 (repr)
FORMAT_SIMPLE
LOAD_CONST 1 (' ')
LOAD_FAST 3 (d)
CONVERT_VALUE 2 (repr)
LOAD_CONST 2 ('4')
FORMAT_WITH_SPEC
BUILD_STRING 7
RETURN_VALUE
""" % (_fstring.__code__.co_firstlineno, _fstring.__code__.co_firstlineno + 1)
def _with(c):
with c:
x = 1
y = 2
dis_with = """\
%4d RESUME 0
%4d LOAD_FAST 0 (c)
BEFORE_WITH
L1: POP_TOP
%4d LOAD_CONST 1 (1)
STORE_FAST 1 (x)
%4d L2: LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
CALL 2
POP_TOP
%4d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
RETURN_CONST 0 (None)
%4d L3: PUSH_EXC_INFO
WITH_EXCEPT_START
TO_BOOL
POP_JUMP_IF_TRUE 1 (to L4)
RERAISE 2
L4: POP_TOP
L5: POP_EXCEPT
POP_TOP
POP_TOP
%4d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
RETURN_CONST 0 (None)
-- L6: COPY 3
POP_EXCEPT
RERAISE 1
ExceptionTable:
L1 to L2 -> L3 [1] lasti
L3 to L5 -> L6 [3] lasti
""" % (_with.__code__.co_firstlineno,
_with.__code__.co_firstlineno + 1,
_with.__code__.co_firstlineno + 2,
_with.__code__.co_firstlineno + 1,
_with.__code__.co_firstlineno + 3,
_with.__code__.co_firstlineno + 1,
_with.__code__.co_firstlineno + 3,
)
async def _asyncwith(c):
async with c:
x = 1
y = 2
dis_asyncwith = """\
%4d RETURN_GENERATOR
POP_TOP
L1: RESUME 0
%4d LOAD_FAST 0 (c)
BEFORE_ASYNC_WITH
GET_AWAITABLE 1
LOAD_CONST 0 (None)
L2: SEND 3 (to L5)
L3: YIELD_VALUE 1
L4: RESUME 3
JUMP_BACKWARD_NO_INTERRUPT 5 (to L2)
L5: END_SEND
L6: POP_TOP
%4d LOAD_CONST 1 (1)
STORE_FAST 1 (x)
%4d L7: LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
CALL 2
GET_AWAITABLE 2
LOAD_CONST 0 (None)
L8: SEND 3 (to L11)
L9: YIELD_VALUE 1
L10: RESUME 3
JUMP_BACKWARD_NO_INTERRUPT 5 (to L8)
L11: END_SEND
POP_TOP
%4d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
RETURN_CONST 0 (None)
%4d L12: CLEANUP_THROW
L13: JUMP_BACKWARD_NO_INTERRUPT 25 (to L5)
L14: CLEANUP_THROW
L15: JUMP_BACKWARD_NO_INTERRUPT 9 (to L11)
L16: PUSH_EXC_INFO
WITH_EXCEPT_START
GET_AWAITABLE 2
LOAD_CONST 0 (None)
L17: SEND 4 (to L21)
L18: YIELD_VALUE 1
L19: RESUME 3
JUMP_BACKWARD_NO_INTERRUPT 5 (to L17)
L20: CLEANUP_THROW
L21: END_SEND
TO_BOOL
POP_JUMP_IF_TRUE 1 (to L22)
RERAISE 2
L22: POP_TOP
L23: POP_EXCEPT
POP_TOP
POP_TOP
%4d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
RETURN_CONST 0 (None)
-- L24: COPY 3
POP_EXCEPT
RERAISE 1
L25: CALL_INTRINSIC_1 3 (INTRINSIC_STOPITERATION_ERROR)
RERAISE 1
ExceptionTable:
L1 to L3 -> L25 [0] lasti
L3 to L4 -> L12 [3]
L4 to L6 -> L25 [0] lasti
L6 to L7 -> L16 [1] lasti
L7 to L9 -> L25 [0] lasti
L9 to L10 -> L14 [2]
L10 to L13 -> L25 [0] lasti
L14 to L15 -> L25 [0] lasti
L16 to L18 -> L24 [3] lasti
L18 to L19 -> L20 [6]
L19 to L23 -> L24 [3] lasti
L23 to L25 -> L25 [0] lasti
""" % (_asyncwith.__code__.co_firstlineno,
_asyncwith.__code__.co_firstlineno + 1,
_asyncwith.__code__.co_firstlineno + 2,
_asyncwith.__code__.co_firstlineno + 1,
_asyncwith.__code__.co_firstlineno + 3,
_asyncwith.__code__.co_firstlineno + 1,
_asyncwith.__code__.co_firstlineno + 3,
)
def _tryfinally(a, b):
try:
return a
finally:
b()
def _tryfinallyconst(b):
try:
return 1
finally:
b()
dis_tryfinally = """\
%4d RESUME 0
%4d NOP
%4d L1: LOAD_FAST 0 (a)
%4d L2: LOAD_FAST 1 (b)
PUSH_NULL
CALL 0
POP_TOP
RETURN_VALUE
-- L3: PUSH_EXC_INFO
%4d LOAD_FAST 1 (b)
PUSH_NULL
CALL 0
POP_TOP
RERAISE 0
-- L4: COPY 3
POP_EXCEPT
RERAISE 1
ExceptionTable:
L1 to L2 -> L3 [0]
L3 to L4 -> L4 [1] lasti
""" % (_tryfinally.__code__.co_firstlineno,
_tryfinally.__code__.co_firstlineno + 1,
_tryfinally.__code__.co_firstlineno + 2,
_tryfinally.__code__.co_firstlineno + 4,
_tryfinally.__code__.co_firstlineno + 4,
)
dis_tryfinallyconst = """\
%4d RESUME 0
%4d NOP
%4d NOP
%4d LOAD_FAST 0 (b)
PUSH_NULL
CALL 0
POP_TOP
RETURN_CONST 1 (1)
-- L1: PUSH_EXC_INFO
%4d LOAD_FAST 0 (b)
PUSH_NULL
CALL 0
POP_TOP
RERAISE 0
-- L2: COPY 3
POP_EXCEPT
RERAISE 1
ExceptionTable:
L1 to L2 -> L2 [1] lasti
""" % (_tryfinallyconst.__code__.co_firstlineno,
_tryfinallyconst.__code__.co_firstlineno + 1,
_tryfinallyconst.__code__.co_firstlineno + 2,
_tryfinallyconst.__code__.co_firstlineno + 4,
_tryfinallyconst.__code__.co_firstlineno + 4,
)
def _g(x):
yield x
async def _ag(x):
yield x
async def _co(x):
async for item in _ag(x):
pass
def _h(y):
def foo(x):
'''funcdoc'''
return list(x + z for z in y)
return foo
dis_nested_0 = """\
-- MAKE_CELL 0 (y)
%4d RESUME 0
%4d LOAD_FAST 0 (y)
BUILD_TUPLE 1
LOAD_CONST 1 (<code object foo at 0x..., file "%s", line %d>)
MAKE_FUNCTION
SET_FUNCTION_ATTRIBUTE 8 (closure)
STORE_FAST 1 (foo)
%4d LOAD_FAST 1 (foo)
RETURN_VALUE
""" % (_h.__code__.co_firstlineno,
_h.__code__.co_firstlineno + 1,
__file__,
_h.__code__.co_firstlineno + 1,
_h.__code__.co_firstlineno + 4,
)
dis_nested_1 = """%s
Disassembly of <code object foo at 0x..., file "%s", line %d>:
-- COPY_FREE_VARS 1
MAKE_CELL 0 (x)
%4d RESUME 0
%4d LOAD_GLOBAL 1 (list + NULL)
LOAD_FAST 0 (x)
BUILD_TUPLE 1
LOAD_CONST 1 (<code object <genexpr> at 0x..., file "%s", line %d>)
MAKE_FUNCTION
SET_FUNCTION_ATTRIBUTE 8 (closure)
LOAD_DEREF 1 (y)
GET_ITER
CALL 0
CALL 1
RETURN_VALUE
""" % (dis_nested_0,
__file__,
_h.__code__.co_firstlineno + 1,
_h.__code__.co_firstlineno + 1,
_h.__code__.co_firstlineno + 3,
__file__,
_h.__code__.co_firstlineno + 3,
)
dis_nested_2 = """%s
Disassembly of <code object <genexpr> at 0x..., file "%s", line %d>:
-- COPY_FREE_VARS 1
%4d RETURN_GENERATOR
POP_TOP
L1: RESUME 0
LOAD_FAST 0 (.0)
L2: FOR_ITER 10 (to L3)
STORE_FAST 1 (z)
LOAD_DEREF 2 (x)
LOAD_FAST 1 (z)
BINARY_OP 0 (+)
YIELD_VALUE 0
RESUME 5
POP_TOP
JUMP_BACKWARD 12 (to L2)
L3: END_FOR
RETURN_CONST 0 (None)
-- L4: CALL_INTRINSIC_1 3 (INTRINSIC_STOPITERATION_ERROR)
RERAISE 1
ExceptionTable:
L1 to L4 -> L4 [0] lasti
""" % (dis_nested_1,
__file__,
_h.__code__.co_firstlineno + 3,
_h.__code__.co_firstlineno + 3,
)
def load_test(x, y=0):
a, b = x, y
return a, b
dis_load_test_quickened_code = """\
%3d RESUME_CHECK 0
%3d LOAD_FAST_LOAD_FAST 1 (x, y)
STORE_FAST_STORE_FAST 50 (b, a)
%3d LOAD_FAST_LOAD_FAST 35 (a, b)
BUILD_TUPLE 2
RETURN_VALUE
""" % (load_test.__code__.co_firstlineno,
load_test.__code__.co_firstlineno + 1,
load_test.__code__.co_firstlineno + 2)
def loop_test():
for i in [1, 2, 3] * 3:
load_test(i)
dis_loop_test_quickened_code = """\
%3d RESUME_CHECK 0
%3d BUILD_LIST 0
LOAD_CONST 1 ((1, 2, 3))
LIST_EXTEND 1
LOAD_CONST 2 (3)
BINARY_OP 5 (*)
GET_ITER
L1: FOR_ITER_LIST 14 (to L2)
STORE_FAST 0 (i)
%3d LOAD_GLOBAL_MODULE 1 (load_test + NULL)
LOAD_FAST 0 (i)
CALL_PY_WITH_DEFAULTS 1
POP_TOP
JUMP_BACKWARD 16 (to L1)
%3d L2: END_FOR
RETURN_CONST 0 (None)
""" % (loop_test.__code__.co_firstlineno,
loop_test.__code__.co_firstlineno + 1,
loop_test.__code__.co_firstlineno + 2,
loop_test.__code__.co_firstlineno + 1,)
def extended_arg_quick():
*_, _ = ...
dis_extended_arg_quick_code = """\
%3d RESUME 0
%3d LOAD_CONST 1 (Ellipsis)
EXTENDED_ARG 1
UNPACK_EX 256
POP_TOP
STORE_FAST 0 (_)
RETURN_CONST 0 (None)
"""% (extended_arg_quick.__code__.co_firstlineno,
extended_arg_quick.__code__.co_firstlineno + 1,)
ADAPTIVE_WARMUP_DELAY = 2
class DisTestBase(unittest.TestCase):
"Common utilities for DisTests and TestDisTraceback"
def strip_addresses(self, text):
return re.sub(r'\b0x[0-9A-Fa-f]+\b', '0x...', text)
def assert_exception_table_increasing(self, lines):
prev_start, prev_end = -1, -1
count = 0
for line in lines:
m = re.match(r' L(\d+) to L(\d+) -> L\d+ \[\d+\]', line)
start, end = [int(g) for g in m.groups()]
self.assertGreaterEqual(end, start)
self.assertGreaterEqual(start, prev_end)
prev_start, prev_end = start, end
count += 1
return count
def do_disassembly_compare(self, got, expected):
if got != expected:
got = self.strip_addresses(got)
self.assertEqual(got, expected)
class DisTests(DisTestBase):
maxDiff = None
def get_disassembly(self, func, lasti=-1, wrapper=True, **kwargs):
# We want to test the default printing behaviour, not the file arg
output = io.StringIO()
with contextlib.redirect_stdout(output):
if wrapper:
dis.dis(func, **kwargs)
else:
dis.disassemble(func, lasti, **kwargs)
return output.getvalue()
def get_disassemble_as_string(self, func, lasti=-1):
return self.get_disassembly(func, lasti, False)
def do_disassembly_test(self, func, expected, **kwargs):
self.maxDiff = None
got = self.get_disassembly(func, depth=0, **kwargs)
self.do_disassembly_compare(got, expected)
# Add checks for dis.disco
if hasattr(func, '__code__'):
got_disco = io.StringIO()
with contextlib.redirect_stdout(got_disco):
dis.disco(func.__code__, **kwargs)
self.do_disassembly_compare(got_disco.getvalue(), expected)
def test_opmap(self):
self.assertEqual(dis.opmap["CACHE"], 0)
self.assertIn(dis.opmap["LOAD_CONST"], dis.hasconst)
self.assertIn(dis.opmap["STORE_NAME"], dis.hasname)
def test_opname(self):
self.assertEqual(dis.opname[dis.opmap["LOAD_FAST"]], "LOAD_FAST")
def test_boundaries(self):
self.assertEqual(dis.opmap["EXTENDED_ARG"], dis.EXTENDED_ARG)
def test_widths(self):
long_opcodes = set(['JUMP_BACKWARD_NO_INTERRUPT',
'INSTRUMENTED_CALL_FUNCTION_EX'])
for opcode, opname in enumerate(dis.opname):
if opname in long_opcodes or opname.startswith("INSTRUMENTED"):
continue
with self.subTest(opname=opname):
width = dis._OPNAME_WIDTH
if opcode in dis.hasarg:
width += 1 + dis._OPARG_WIDTH
self.assertLessEqual(len(opname), width)
def test_dis(self):
self.do_disassembly_test(_f, dis_f)
def test_dis_with_offsets(self):
self.do_disassembly_test(_f, dis_f_with_offsets, show_offsets=True)
def test_bug_708901(self):
self.do_disassembly_test(bug708901, dis_bug708901)
def test_bug_1333982(self):
# This one is checking bytecodes generated for an `assert` statement,
# so fails if the tests are run with -O. Skip this test then.
if not __debug__:
self.skipTest('need asserts, run without -O')
self.do_disassembly_test(bug1333982, dis_bug1333982)
def test_bug_42562(self):
self.do_disassembly_test(bug42562, dis_bug42562)
def test_bug_45757(self):
# Extended arg followed by NOP
self.do_disassembly_test(code_bug_45757, dis_bug_45757)
def test_bug_46724(self):
# Test that negative operargs are handled properly
self.do_disassembly_test(bug46724, dis_bug46724)
def test_kw_names(self):
# Test that value is displayed for keyword argument names:
self.do_disassembly_test(wrap_func_w_kwargs, dis_kw_names)
def test_intrinsic_1(self):
# Test that argrepr is displayed for CALL_INTRINSIC_1
self.do_disassembly_test("from math import *", dis_intrinsic_1_2)
self.do_disassembly_test("+a", dis_intrinsic_1_5)
self.do_disassembly_test("(*a,)", dis_intrinsic_1_6)
def test_intrinsic_2(self):
self.assertIn("CALL_INTRINSIC_2 1 (INTRINSIC_PREP_RERAISE_STAR)",
self.get_disassembly("try: pass\nexcept* Exception: x"))
def test_big_linenos(self):
def func(count):
namespace = {}
func = "def foo():\n " + "".join(["\n "] * count + ["spam\n"])
exec(func, namespace)
return namespace['foo']
# Test all small ranges
for i in range(1, 300):
expected = _BIG_LINENO_FORMAT % (i + 2)
self.do_disassembly_test(func(i), expected)
# Test some larger ranges too
for i in range(300, 1000, 10):
expected = _BIG_LINENO_FORMAT % (i + 2)