mirror of https://github.com/python/cpython
299 lines
7.1 KiB
Python
299 lines
7.1 KiB
Python
from test.test_support import verify, verbose, TestFailed, vereq
|
|
import sys
|
|
import gc
|
|
|
|
def expect(actual, expected, name):
|
|
if actual != expected:
|
|
raise TestFailed, "test_%s: actual %d, expected %d" % (
|
|
name, actual, expected)
|
|
|
|
def expect_nonzero(actual, name):
|
|
if actual == 0:
|
|
raise TestFailed, "test_%s: unexpected zero" % name
|
|
|
|
def run_test(name, thunk):
|
|
if verbose:
|
|
print "testing %s..." % name,
|
|
thunk()
|
|
if verbose:
|
|
print "ok"
|
|
|
|
def test_list():
|
|
l = []
|
|
l.append(l)
|
|
gc.collect()
|
|
del l
|
|
expect(gc.collect(), 1, "list")
|
|
|
|
def test_dict():
|
|
d = {}
|
|
d[1] = d
|
|
gc.collect()
|
|
del d
|
|
expect(gc.collect(), 1, "dict")
|
|
|
|
def test_tuple():
|
|
# since tuples are immutable we close the loop with a list
|
|
l = []
|
|
t = (l,)
|
|
l.append(t)
|
|
gc.collect()
|
|
del t
|
|
del l
|
|
expect(gc.collect(), 2, "tuple")
|
|
|
|
def test_class():
|
|
class A:
|
|
pass
|
|
A.a = A
|
|
gc.collect()
|
|
del A
|
|
expect_nonzero(gc.collect(), "class")
|
|
|
|
def test_newstyleclass():
|
|
class A(object):
|
|
pass
|
|
gc.collect()
|
|
del A
|
|
expect_nonzero(gc.collect(), "staticclass")
|
|
|
|
def test_instance():
|
|
class A:
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
gc.collect()
|
|
del a
|
|
expect_nonzero(gc.collect(), "instance")
|
|
|
|
def test_newinstance():
|
|
class A(object):
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
gc.collect()
|
|
del a
|
|
expect_nonzero(gc.collect(), "newinstance")
|
|
class B(list):
|
|
pass
|
|
class C(B, A):
|
|
pass
|
|
a = C()
|
|
a.a = a
|
|
gc.collect()
|
|
del a
|
|
expect_nonzero(gc.collect(), "newinstance(2)")
|
|
del B, C
|
|
expect_nonzero(gc.collect(), "newinstance(3)")
|
|
A.a = A()
|
|
del A
|
|
expect_nonzero(gc.collect(), "newinstance(4)")
|
|
expect(gc.collect(), 0, "newinstance(5)")
|
|
|
|
def test_method():
|
|
# Tricky: self.__init__ is a bound method, it references the instance.
|
|
class A:
|
|
def __init__(self):
|
|
self.init = self.__init__
|
|
a = A()
|
|
gc.collect()
|
|
del a
|
|
expect_nonzero(gc.collect(), "method")
|
|
|
|
def test_finalizer():
|
|
# A() is uncollectable if it is part of a cycle, make sure it shows up
|
|
# in gc.garbage.
|
|
class A:
|
|
def __del__(self): pass
|
|
class B:
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
id_a = id(a)
|
|
b = B()
|
|
b.b = b
|
|
gc.collect()
|
|
del a
|
|
del b
|
|
expect_nonzero(gc.collect(), "finalizer")
|
|
for obj in gc.garbage:
|
|
if id(obj) == id_a:
|
|
del obj.a
|
|
break
|
|
else:
|
|
raise TestFailed, "didn't find obj in garbage (finalizer)"
|
|
gc.garbage.remove(obj)
|
|
|
|
def test_finalizer_newclass():
|
|
# A() is uncollectable if it is part of a cycle, make sure it shows up
|
|
# in gc.garbage.
|
|
class A(object):
|
|
def __del__(self): pass
|
|
class B(object):
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
id_a = id(a)
|
|
b = B()
|
|
b.b = b
|
|
gc.collect()
|
|
del a
|
|
del b
|
|
expect_nonzero(gc.collect(), "finalizer")
|
|
for obj in gc.garbage:
|
|
if id(obj) == id_a:
|
|
del obj.a
|
|
break
|
|
else:
|
|
raise TestFailed, "didn't find obj in garbage (finalizer)"
|
|
gc.garbage.remove(obj)
|
|
|
|
def test_function():
|
|
# Tricky: f -> d -> f, code should call d.clear() after the exec to
|
|
# break the cycle.
|
|
d = {}
|
|
exec("def f(): pass\n") in d
|
|
gc.collect()
|
|
del d
|
|
expect(gc.collect(), 2, "function")
|
|
|
|
def test_frame():
|
|
def f():
|
|
frame = sys._getframe()
|
|
gc.collect()
|
|
f()
|
|
expect(gc.collect(), 1, "frame")
|
|
|
|
|
|
def test_saveall():
|
|
# Verify that cyclic garbage like lists show up in gc.garbage if the
|
|
# SAVEALL option is enabled.
|
|
|
|
# First make sure we don't save away other stuff that just happens to
|
|
# be waiting for collection.
|
|
gc.collect()
|
|
vereq(gc.garbage, []) # if this fails, someone else created immortal trash
|
|
|
|
L = []
|
|
L.append(L)
|
|
id_L = id(L)
|
|
|
|
debug = gc.get_debug()
|
|
gc.set_debug(debug | gc.DEBUG_SAVEALL)
|
|
del L
|
|
gc.collect()
|
|
gc.set_debug(debug)
|
|
|
|
vereq(len(gc.garbage), 1)
|
|
obj = gc.garbage.pop()
|
|
vereq(id(obj), id_L)
|
|
|
|
def test_del():
|
|
# __del__ methods can trigger collection, make this to happen
|
|
thresholds = gc.get_threshold()
|
|
gc.enable()
|
|
gc.set_threshold(1)
|
|
|
|
class A:
|
|
def __del__(self):
|
|
dir(self)
|
|
a = A()
|
|
del a
|
|
|
|
gc.disable()
|
|
gc.set_threshold(*thresholds)
|
|
|
|
def test_del_newclass():
|
|
# __del__ methods can trigger collection, make this to happen
|
|
thresholds = gc.get_threshold()
|
|
gc.enable()
|
|
gc.set_threshold(1)
|
|
|
|
class A(object):
|
|
def __del__(self):
|
|
dir(self)
|
|
a = A()
|
|
del a
|
|
|
|
gc.disable()
|
|
gc.set_threshold(*thresholds)
|
|
|
|
class Ouch:
|
|
n = 0
|
|
def __del__(self):
|
|
Ouch.n = Ouch.n + 1
|
|
if Ouch.n % 17 == 0:
|
|
gc.collect()
|
|
|
|
def test_trashcan():
|
|
# "trashcan" is a hack to prevent stack overflow when deallocating
|
|
# very deeply nested tuples etc. It works in part by abusing the
|
|
# type pointer and refcount fields, and that can yield horrible
|
|
# problems when gc tries to traverse the structures.
|
|
# If this test fails (as it does in 2.0, 2.1 and 2.2), it will
|
|
# most likely die via segfault.
|
|
|
|
# Note: In 2.3 the possibility for compiling without cyclic gc was
|
|
# removed, and that in turn allows the trashcan mechanism to work
|
|
# via much simpler means (e.g., it never abuses the type pointer or
|
|
# refcount fields anymore). Since it's much less likely to cause a
|
|
# problem now, the various constants in this expensive (we force a lot
|
|
# of full collections) test are cut back from the 2.2 version.
|
|
gc.enable()
|
|
N = 150
|
|
for count in range(2):
|
|
t = []
|
|
for i in range(N):
|
|
t = [t, Ouch()]
|
|
u = []
|
|
for i in range(N):
|
|
u = [u, Ouch()]
|
|
v = {}
|
|
for i in range(N):
|
|
v = {1: v, 2: Ouch()}
|
|
gc.disable()
|
|
|
|
def test_all():
|
|
gc.collect() # Delete 2nd generation garbage
|
|
run_test("lists", test_list)
|
|
run_test("dicts", test_dict)
|
|
run_test("tuples", test_tuple)
|
|
run_test("classes", test_class)
|
|
run_test("new style classes", test_newstyleclass)
|
|
run_test("instances", test_instance)
|
|
run_test("new instances", test_newinstance)
|
|
run_test("methods", test_method)
|
|
run_test("functions", test_function)
|
|
run_test("frames", test_frame)
|
|
run_test("finalizers", test_finalizer)
|
|
run_test("finalizers (new class)", test_finalizer_newclass)
|
|
run_test("__del__", test_del)
|
|
run_test("__del__ (new class)", test_del_newclass)
|
|
run_test("saveall", test_saveall)
|
|
run_test("trashcan", test_trashcan)
|
|
|
|
def test():
|
|
if verbose:
|
|
print "disabling automatic collection"
|
|
enabled = gc.isenabled()
|
|
gc.disable()
|
|
verify(not gc.isenabled())
|
|
debug = gc.get_debug()
|
|
gc.set_debug(debug & ~gc.DEBUG_LEAK) # this test is supposed to leak
|
|
|
|
try:
|
|
test_all()
|
|
finally:
|
|
gc.set_debug(debug)
|
|
# test gc.enable() even if GC is disabled by default
|
|
if verbose:
|
|
print "restoring automatic collection"
|
|
# make sure to always test gc.enable()
|
|
gc.enable()
|
|
verify(gc.isenabled())
|
|
if not enabled:
|
|
gc.disable()
|
|
|
|
|
|
test()
|