484 lines
14 KiB
Python
484 lines
14 KiB
Python
"""This module includes tests of the code object representation.
|
|
|
|
>>> def f(x):
|
|
... def g(y):
|
|
... return x + y
|
|
... return g
|
|
...
|
|
|
|
>>> dump(f.__code__)
|
|
name: f
|
|
argcount: 1
|
|
posonlyargcount: 0
|
|
kwonlyargcount: 0
|
|
names: ()
|
|
varnames: ('x', 'g')
|
|
cellvars: ('x',)
|
|
freevars: ()
|
|
nlocals: 2
|
|
flags: 3
|
|
consts: ('None', '<code object g>', "'f.<locals>.g'")
|
|
|
|
>>> dump(f(4).__code__)
|
|
name: g
|
|
argcount: 1
|
|
posonlyargcount: 0
|
|
kwonlyargcount: 0
|
|
names: ()
|
|
varnames: ('y',)
|
|
cellvars: ()
|
|
freevars: ('x',)
|
|
nlocals: 1
|
|
flags: 19
|
|
consts: ('None',)
|
|
|
|
>>> def h(x, y):
|
|
... a = x + y
|
|
... b = x - y
|
|
... c = a * b
|
|
... return c
|
|
...
|
|
|
|
>>> dump(h.__code__)
|
|
name: h
|
|
argcount: 2
|
|
posonlyargcount: 0
|
|
kwonlyargcount: 0
|
|
names: ()
|
|
varnames: ('x', 'y', 'a', 'b', 'c')
|
|
cellvars: ()
|
|
freevars: ()
|
|
nlocals: 5
|
|
flags: 67
|
|
consts: ('None',)
|
|
|
|
>>> def attrs(obj):
|
|
... print(obj.attr1)
|
|
... print(obj.attr2)
|
|
... print(obj.attr3)
|
|
|
|
>>> dump(attrs.__code__)
|
|
name: attrs
|
|
argcount: 1
|
|
posonlyargcount: 0
|
|
kwonlyargcount: 0
|
|
names: ('print', 'attr1', 'attr2', 'attr3')
|
|
varnames: ('obj',)
|
|
cellvars: ()
|
|
freevars: ()
|
|
nlocals: 1
|
|
flags: 67
|
|
consts: ('None',)
|
|
|
|
>>> def optimize_away():
|
|
... 'doc string'
|
|
... 'not a docstring'
|
|
... 53
|
|
... 0x53
|
|
|
|
>>> dump(optimize_away.__code__)
|
|
name: optimize_away
|
|
argcount: 0
|
|
posonlyargcount: 0
|
|
kwonlyargcount: 0
|
|
names: ()
|
|
varnames: ()
|
|
cellvars: ()
|
|
freevars: ()
|
|
nlocals: 0
|
|
flags: 67
|
|
consts: ("'doc string'", 'None')
|
|
|
|
>>> def keywordonly_args(a,b,*,k1):
|
|
... return a,b,k1
|
|
...
|
|
|
|
>>> dump(keywordonly_args.__code__)
|
|
name: keywordonly_args
|
|
argcount: 2
|
|
posonlyargcount: 0
|
|
kwonlyargcount: 1
|
|
names: ()
|
|
varnames: ('a', 'b', 'k1')
|
|
cellvars: ()
|
|
freevars: ()
|
|
nlocals: 3
|
|
flags: 67
|
|
consts: ('None',)
|
|
|
|
>>> def posonly_args(a,b,/,c):
|
|
... return a,b,c
|
|
...
|
|
|
|
>>> dump(posonly_args.__code__)
|
|
name: posonly_args
|
|
argcount: 3
|
|
posonlyargcount: 2
|
|
kwonlyargcount: 0
|
|
names: ()
|
|
varnames: ('a', 'b', 'c')
|
|
cellvars: ()
|
|
freevars: ()
|
|
nlocals: 3
|
|
flags: 67
|
|
consts: ('None',)
|
|
|
|
"""
|
|
|
|
import inspect
|
|
import sys
|
|
import threading
|
|
import unittest
|
|
import weakref
|
|
import opcode
|
|
try:
|
|
import ctypes
|
|
except ImportError:
|
|
ctypes = None
|
|
from test.support import (run_doctest, run_unittest, cpython_only,
|
|
check_impl_detail)
|
|
|
|
|
|
def consts(t):
|
|
"""Yield a doctest-safe sequence of object reprs."""
|
|
for elt in t:
|
|
r = repr(elt)
|
|
if r.startswith("<code object"):
|
|
yield "<code object %s>" % elt.co_name
|
|
else:
|
|
yield r
|
|
|
|
def dump(co):
|
|
"""Print out a text representation of a code object."""
|
|
for attr in ["name", "argcount", "posonlyargcount",
|
|
"kwonlyargcount", "names", "varnames",
|
|
"cellvars", "freevars", "nlocals", "flags"]:
|
|
print("%s: %s" % (attr, getattr(co, "co_" + attr)))
|
|
print("consts:", tuple(consts(co.co_consts)))
|
|
|
|
# Needed for test_closure_injection below
|
|
# Defined at global scope to avoid implicitly closing over __class__
|
|
def external_getitem(self, i):
|
|
return f"Foreign getitem: {super().__getitem__(i)}"
|
|
|
|
class CodeTest(unittest.TestCase):
|
|
|
|
@cpython_only
|
|
def test_newempty(self):
|
|
import _testcapi
|
|
co = _testcapi.code_newempty("filename", "funcname", 15)
|
|
self.assertEqual(co.co_filename, "filename")
|
|
self.assertEqual(co.co_name, "funcname")
|
|
self.assertEqual(co.co_firstlineno, 15)
|
|
|
|
@cpython_only
|
|
def test_closure_injection(self):
|
|
# From https://bugs.python.org/issue32176
|
|
from types import FunctionType
|
|
|
|
def create_closure(__class__):
|
|
return (lambda: __class__).__closure__
|
|
|
|
def new_code(c):
|
|
'''A new code object with a __class__ cell added to freevars'''
|
|
return c.replace(co_freevars=c.co_freevars + ('__class__',))
|
|
|
|
def add_foreign_method(cls, name, f):
|
|
code = new_code(f.__code__)
|
|
assert not f.__closure__
|
|
closure = create_closure(cls)
|
|
defaults = f.__defaults__
|
|
setattr(cls, name, FunctionType(code, globals(), name, defaults, closure))
|
|
|
|
class List(list):
|
|
pass
|
|
|
|
add_foreign_method(List, "__getitem__", external_getitem)
|
|
|
|
# Ensure the closure injection actually worked
|
|
function = List.__getitem__
|
|
class_ref = function.__closure__[0].cell_contents
|
|
self.assertIs(class_ref, List)
|
|
|
|
# Ensure the code correctly indicates it accesses a free variable
|
|
self.assertFalse(function.__code__.co_flags & inspect.CO_NOFREE,
|
|
hex(function.__code__.co_flags))
|
|
|
|
# Ensure the zero-arg super() call in the injected method works
|
|
obj = List([1, 2, 3])
|
|
self.assertEqual(obj[0], "Foreign getitem: 1")
|
|
|
|
def test_constructor(self):
|
|
def func(): pass
|
|
co = func.__code__
|
|
CodeType = type(co)
|
|
|
|
# test code constructor
|
|
return CodeType(co.co_argcount,
|
|
co.co_posonlyargcount,
|
|
co.co_kwonlyargcount,
|
|
co.co_nlocals,
|
|
co.co_stacksize,
|
|
co.co_flags,
|
|
co.co_code,
|
|
co.co_consts,
|
|
co.co_names,
|
|
co.co_varnames,
|
|
co.co_filename,
|
|
co.co_name,
|
|
co.co_firstlineno,
|
|
co.co_lnotab,
|
|
co.co_freevars,
|
|
co.co_cellvars)
|
|
|
|
def test_replace(self):
|
|
def func():
|
|
x = 1
|
|
return x
|
|
code = func.__code__
|
|
|
|
# different co_name, co_varnames, co_consts
|
|
def func2():
|
|
y = 2
|
|
return y
|
|
code2 = func2.__code__
|
|
|
|
for attr, value in (
|
|
("co_argcount", 0),
|
|
("co_posonlyargcount", 0),
|
|
("co_kwonlyargcount", 0),
|
|
("co_nlocals", 0),
|
|
("co_stacksize", 0),
|
|
("co_flags", code.co_flags | inspect.CO_COROUTINE),
|
|
("co_firstlineno", 100),
|
|
("co_code", code2.co_code),
|
|
("co_consts", code2.co_consts),
|
|
("co_names", ("myname",)),
|
|
("co_varnames", code2.co_varnames),
|
|
("co_freevars", ("freevar",)),
|
|
("co_cellvars", ("cellvar",)),
|
|
("co_filename", "newfilename"),
|
|
("co_name", "newname"),
|
|
("co_lnotab", code2.co_lnotab),
|
|
):
|
|
with self.subTest(attr=attr, value=value):
|
|
new_code = code.replace(**{attr: value})
|
|
self.assertEqual(getattr(new_code, attr), value)
|
|
|
|
|
|
def isinterned(s):
|
|
return s is sys.intern(('_' + s + '_')[1:-1])
|
|
|
|
class CodeConstsTest(unittest.TestCase):
|
|
|
|
def find_const(self, consts, value):
|
|
for v in consts:
|
|
if v == value:
|
|
return v
|
|
self.assertIn(value, consts) # raises an exception
|
|
self.fail('Should never be reached')
|
|
|
|
def assertIsInterned(self, s):
|
|
if not isinterned(s):
|
|
self.fail('String %r is not interned' % (s,))
|
|
|
|
def assertIsNotInterned(self, s):
|
|
if isinterned(s):
|
|
self.fail('String %r is interned' % (s,))
|
|
|
|
@cpython_only
|
|
def test_interned_string(self):
|
|
co = compile('res = "str_value"', '?', 'exec')
|
|
v = self.find_const(co.co_consts, 'str_value')
|
|
self.assertIsInterned(v)
|
|
|
|
@cpython_only
|
|
def test_interned_string_in_tuple(self):
|
|
co = compile('res = ("str_value",)', '?', 'exec')
|
|
v = self.find_const(co.co_consts, ('str_value',))
|
|
self.assertIsInterned(v[0])
|
|
|
|
@cpython_only
|
|
def test_interned_string_in_frozenset(self):
|
|
co = compile('res = a in {"str_value"}', '?', 'exec')
|
|
v = self.find_const(co.co_consts, frozenset(('str_value',)))
|
|
self.assertIsInterned(tuple(v)[0])
|
|
|
|
@cpython_only
|
|
def test_interned_string_default(self):
|
|
def f(a='str_value'):
|
|
return a
|
|
self.assertIsInterned(f())
|
|
|
|
@cpython_only
|
|
def test_interned_string_with_null(self):
|
|
co = compile(r'res = "str\0value!"', '?', 'exec')
|
|
v = self.find_const(co.co_consts, 'str\0value!')
|
|
self.assertIsNotInterned(v)
|
|
|
|
|
|
class CodeWeakRefTest(unittest.TestCase):
|
|
|
|
def test_basic(self):
|
|
# Create a code object in a clean environment so that we know we have
|
|
# the only reference to it left.
|
|
namespace = {}
|
|
exec("def f(): pass", globals(), namespace)
|
|
f = namespace["f"]
|
|
del namespace
|
|
|
|
self.called = False
|
|
def callback(code):
|
|
self.called = True
|
|
|
|
# f is now the last reference to the function, and through it, the code
|
|
# object. While we hold it, check that we can create a weakref and
|
|
# deref it. Then delete it, and check that the callback gets called and
|
|
# the reference dies.
|
|
coderef = weakref.ref(f.__code__, callback)
|
|
self.assertTrue(bool(coderef()))
|
|
del f
|
|
self.assertFalse(bool(coderef()))
|
|
self.assertTrue(self.called)
|
|
|
|
|
|
if check_impl_detail(cpython=True) and ctypes is not None:
|
|
py = ctypes.pythonapi
|
|
freefunc = ctypes.CFUNCTYPE(None,ctypes.c_voidp)
|
|
|
|
RequestCodeExtraIndex = py._PyEval_RequestCodeExtraIndex
|
|
RequestCodeExtraIndex.argtypes = (freefunc,)
|
|
RequestCodeExtraIndex.restype = ctypes.c_ssize_t
|
|
|
|
SetExtra = py._PyCode_SetExtra
|
|
SetExtra.argtypes = (ctypes.py_object, ctypes.c_ssize_t, ctypes.c_voidp)
|
|
SetExtra.restype = ctypes.c_int
|
|
|
|
GetExtra = py._PyCode_GetExtra
|
|
GetExtra.argtypes = (ctypes.py_object, ctypes.c_ssize_t,
|
|
ctypes.POINTER(ctypes.c_voidp))
|
|
GetExtra.restype = ctypes.c_int
|
|
|
|
LAST_FREED = None
|
|
def myfree(ptr):
|
|
global LAST_FREED
|
|
LAST_FREED = ptr
|
|
|
|
FREE_FUNC = freefunc(myfree)
|
|
FREE_INDEX = RequestCodeExtraIndex(FREE_FUNC)
|
|
|
|
class CoExtra(unittest.TestCase):
|
|
def get_func(self):
|
|
# Defining a function causes the containing function to have a
|
|
# reference to the code object. We need the code objects to go
|
|
# away, so we eval a lambda.
|
|
return eval('lambda:42')
|
|
|
|
def test_get_non_code(self):
|
|
f = self.get_func()
|
|
|
|
self.assertRaises(SystemError, SetExtra, 42, FREE_INDEX,
|
|
ctypes.c_voidp(100))
|
|
self.assertRaises(SystemError, GetExtra, 42, FREE_INDEX,
|
|
ctypes.c_voidp(100))
|
|
|
|
def test_bad_index(self):
|
|
f = self.get_func()
|
|
self.assertRaises(SystemError, SetExtra, f.__code__,
|
|
FREE_INDEX+100, ctypes.c_voidp(100))
|
|
self.assertEqual(GetExtra(f.__code__, FREE_INDEX+100,
|
|
ctypes.c_voidp(100)), 0)
|
|
|
|
def test_free_called(self):
|
|
# Verify that the provided free function gets invoked
|
|
# when the code object is cleaned up.
|
|
f = self.get_func()
|
|
|
|
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(100))
|
|
del f
|
|
self.assertEqual(LAST_FREED, 100)
|
|
|
|
def test_get_set(self):
|
|
# Test basic get/set round tripping.
|
|
f = self.get_func()
|
|
|
|
extra = ctypes.c_voidp()
|
|
|
|
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(200))
|
|
# reset should free...
|
|
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(300))
|
|
self.assertEqual(LAST_FREED, 200)
|
|
|
|
extra = ctypes.c_voidp()
|
|
GetExtra(f.__code__, FREE_INDEX, extra)
|
|
self.assertEqual(extra.value, 300)
|
|
del f
|
|
|
|
def test_free_different_thread(self):
|
|
# Freeing a code object on a different thread then
|
|
# where the co_extra was set should be safe.
|
|
f = self.get_func()
|
|
class ThreadTest(threading.Thread):
|
|
def __init__(self, f, test):
|
|
super().__init__()
|
|
self.f = f
|
|
self.test = test
|
|
def run(self):
|
|
del self.f
|
|
self.test.assertEqual(LAST_FREED, 500)
|
|
|
|
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(500))
|
|
tt = ThreadTest(f, self)
|
|
del f
|
|
tt.start()
|
|
tt.join()
|
|
self.assertEqual(LAST_FREED, 500)
|
|
|
|
@cpython_only
|
|
def test_clean_stack_on_return(self):
|
|
|
|
def f(x):
|
|
return x
|
|
|
|
code = f.__code__
|
|
ct = type(f.__code__)
|
|
|
|
# Insert an extra LOAD_FAST, this duplicates the value of
|
|
# 'x' in the stack, leaking it if the frame is not properly
|
|
# cleaned up upon exit.
|
|
|
|
bytecode = list(code.co_code)
|
|
bytecode.insert(-2, opcode.opmap['LOAD_FAST'])
|
|
bytecode.insert(-2, 0)
|
|
|
|
c = ct(code.co_argcount, code.co_posonlyargcount,
|
|
code.co_kwonlyargcount, code.co_nlocals, code.co_stacksize+1,
|
|
code.co_flags, bytes(bytecode),
|
|
code.co_consts, code.co_names, code.co_varnames,
|
|
code.co_filename, code.co_name, code.co_firstlineno,
|
|
code.co_lnotab, code.co_freevars, code.co_cellvars)
|
|
new_function = type(f)(c, f.__globals__, 'nf', f.__defaults__, f.__closure__)
|
|
|
|
class Var:
|
|
pass
|
|
the_object = Var()
|
|
var = weakref.ref(the_object)
|
|
|
|
new_function(the_object)
|
|
|
|
# Check if the_object is leaked
|
|
del the_object
|
|
assert var() is None
|
|
|
|
|
|
def test_main(verbose=None):
|
|
from test import test_code
|
|
run_doctest(test_code, verbose)
|
|
tests = [CodeTest, CodeConstsTest, CodeWeakRefTest]
|
|
if check_impl_detail(cpython=True) and ctypes is not None:
|
|
tests.append(CoExtra)
|
|
run_unittest(*tests)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|