mirror of https://github.com/python/cpython
376 lines
9.3 KiB
Python
376 lines
9.3 KiB
Python
from test.test_support import verify, verbose, TestFailed, vereq
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import sys
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import gc
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def expect(actual, expected, name):
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if actual != expected:
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raise TestFailed, "test_%s: actual %r, expected %r" % (
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name, actual, expected)
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def expect_nonzero(actual, name):
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if actual == 0:
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raise TestFailed, "test_%s: unexpected zero" % name
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def run_test(name, thunk):
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if verbose:
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print "testing %s..." % name,
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thunk()
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if verbose:
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print "ok"
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def test_list():
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l = []
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l.append(l)
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gc.collect()
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del l
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expect(gc.collect(), 1, "list")
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def test_dict():
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d = {}
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d[1] = d
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gc.collect()
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del d
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expect(gc.collect(), 1, "dict")
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def test_tuple():
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# since tuples are immutable we close the loop with a list
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l = []
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t = (l,)
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l.append(t)
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gc.collect()
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del t
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del l
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expect(gc.collect(), 2, "tuple")
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def test_class():
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class A:
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pass
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A.a = A
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gc.collect()
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del A
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expect_nonzero(gc.collect(), "class")
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def test_newstyleclass():
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class A(object):
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pass
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gc.collect()
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del A
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expect_nonzero(gc.collect(), "staticclass")
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def test_instance():
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class A:
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pass
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a = A()
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a.a = a
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gc.collect()
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del a
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expect_nonzero(gc.collect(), "instance")
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def test_newinstance():
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class A(object):
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pass
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a = A()
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a.a = a
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gc.collect()
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del a
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expect_nonzero(gc.collect(), "newinstance")
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class B(list):
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pass
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class C(B, A):
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pass
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a = C()
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a.a = a
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gc.collect()
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del a
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expect_nonzero(gc.collect(), "newinstance(2)")
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del B, C
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expect_nonzero(gc.collect(), "newinstance(3)")
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A.a = A()
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del A
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expect_nonzero(gc.collect(), "newinstance(4)")
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expect(gc.collect(), 0, "newinstance(5)")
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def test_method():
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# Tricky: self.__init__ is a bound method, it references the instance.
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class A:
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def __init__(self):
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self.init = self.__init__
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a = A()
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gc.collect()
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del a
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expect_nonzero(gc.collect(), "method")
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def test_finalizer():
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# A() is uncollectable if it is part of a cycle, make sure it shows up
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# in gc.garbage.
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class A:
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def __del__(self): pass
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class B:
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pass
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a = A()
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a.a = a
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id_a = id(a)
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b = B()
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b.b = b
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gc.collect()
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del a
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del b
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expect_nonzero(gc.collect(), "finalizer")
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for obj in gc.garbage:
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if id(obj) == id_a:
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del obj.a
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break
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else:
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raise TestFailed, "didn't find obj in garbage (finalizer)"
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gc.garbage.remove(obj)
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def test_finalizer_newclass():
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# A() is uncollectable if it is part of a cycle, make sure it shows up
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# in gc.garbage.
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class A(object):
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def __del__(self): pass
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class B(object):
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pass
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a = A()
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a.a = a
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id_a = id(a)
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b = B()
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b.b = b
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gc.collect()
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del a
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del b
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expect_nonzero(gc.collect(), "finalizer")
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for obj in gc.garbage:
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if id(obj) == id_a:
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del obj.a
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break
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else:
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raise TestFailed, "didn't find obj in garbage (finalizer)"
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gc.garbage.remove(obj)
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def test_function():
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# Tricky: f -> d -> f, code should call d.clear() after the exec to
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# break the cycle.
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d = {}
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exec("def f(): pass\n") in d
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gc.collect()
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del d
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expect(gc.collect(), 2, "function")
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def test_frame():
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def f():
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frame = sys._getframe()
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gc.collect()
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f()
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expect(gc.collect(), 1, "frame")
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def test_saveall():
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# Verify that cyclic garbage like lists show up in gc.garbage if the
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# SAVEALL option is enabled.
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# First make sure we don't save away other stuff that just happens to
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# be waiting for collection.
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gc.collect()
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vereq(gc.garbage, []) # if this fails, someone else created immortal trash
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L = []
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L.append(L)
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id_L = id(L)
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debug = gc.get_debug()
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gc.set_debug(debug | gc.DEBUG_SAVEALL)
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del L
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gc.collect()
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gc.set_debug(debug)
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vereq(len(gc.garbage), 1)
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obj = gc.garbage.pop()
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vereq(id(obj), id_L)
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def test_del():
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# __del__ methods can trigger collection, make this to happen
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thresholds = gc.get_threshold()
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gc.enable()
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gc.set_threshold(1)
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class A:
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def __del__(self):
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dir(self)
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a = A()
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del a
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gc.disable()
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gc.set_threshold(*thresholds)
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def test_del_newclass():
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# __del__ methods can trigger collection, make this to happen
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thresholds = gc.get_threshold()
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gc.enable()
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gc.set_threshold(1)
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class A(object):
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def __del__(self):
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dir(self)
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a = A()
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del a
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gc.disable()
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gc.set_threshold(*thresholds)
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class Ouch:
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n = 0
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def __del__(self):
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Ouch.n = Ouch.n + 1
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if Ouch.n % 17 == 0:
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gc.collect()
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def test_trashcan():
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# "trashcan" is a hack to prevent stack overflow when deallocating
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# very deeply nested tuples etc. It works in part by abusing the
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# type pointer and refcount fields, and that can yield horrible
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# problems when gc tries to traverse the structures.
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# If this test fails (as it does in 2.0, 2.1 and 2.2), it will
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# most likely die via segfault.
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# Note: In 2.3 the possibility for compiling without cyclic gc was
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# removed, and that in turn allows the trashcan mechanism to work
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# via much simpler means (e.g., it never abuses the type pointer or
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# refcount fields anymore). Since it's much less likely to cause a
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# problem now, the various constants in this expensive (we force a lot
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# of full collections) test are cut back from the 2.2 version.
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gc.enable()
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N = 150
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for count in range(2):
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t = []
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for i in range(N):
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t = [t, Ouch()]
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u = []
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for i in range(N):
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u = [u, Ouch()]
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v = {}
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for i in range(N):
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v = {1: v, 2: Ouch()}
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gc.disable()
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class Boom:
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def __getattr__(self, someattribute):
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del self.attr
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raise AttributeError
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def test_boom():
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a = Boom()
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b = Boom()
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a.attr = b
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b.attr = a
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gc.collect()
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garbagelen = len(gc.garbage)
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del a, b
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# a<->b are in a trash cycle now. Collection will invoke Boom.__getattr__
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# (to see whether a and b have __del__ methods), and __getattr__ deletes
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# the internal "attr" attributes as a side effect. That causes the
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# trash cycle to get reclaimed via refcounts falling to 0, thus mutating
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# the trash graph as a side effect of merely asking whether __del__
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# exists. This used to (before 2.3b1) crash Python. Now __getattr__
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# isn't called.
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expect(gc.collect(), 4, "boom")
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expect(len(gc.garbage), garbagelen, "boom")
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class Boom2:
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def __init__(self):
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self.x = 0
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def __getattr__(self, someattribute):
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self.x += 1
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if self.x > 1:
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del self.attr
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raise AttributeError
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def test_boom2():
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a = Boom2()
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b = Boom2()
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a.attr = b
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b.attr = a
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gc.collect()
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garbagelen = len(gc.garbage)
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del a, b
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# Much like test_boom(), except that __getattr__ doesn't break the
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# cycle until the second time gc checks for __del__. As of 2.3b1,
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# there isn't a second time, so this simply cleans up the trash cycle.
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# We expect a, b, a.__dict__ and b.__dict__ (4 objects) to get reclaimed
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# this way.
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expect(gc.collect(), 4, "boom2")
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expect(len(gc.garbage), garbagelen, "boom2")
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def test_get_referrents():
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alist = [1, 3, 5]
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got = gc.get_referrents(alist)
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got.sort()
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expect(got, alist, "get_referrents")
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atuple = tuple(alist)
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got = gc.get_referrents(atuple)
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got.sort()
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expect(got, alist, "get_referrents")
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adict = {1: 3, 5: 7}
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expected = [1, 3, 5, 7]
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got = gc.get_referrents(adict)
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got.sort()
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expect(got, expected, "get_referrents")
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got = gc.get_referrents([1, 2], {3: 4}, (0, 0, 0))
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got.sort()
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expect(got, [0, 0] + range(5), "get_referrents")
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expect(gc.get_referrents(1, 'a', 4j), [], "get_referrents")
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def test_all():
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gc.collect() # Delete 2nd generation garbage
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run_test("lists", test_list)
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run_test("dicts", test_dict)
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run_test("tuples", test_tuple)
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run_test("classes", test_class)
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run_test("new style classes", test_newstyleclass)
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run_test("instances", test_instance)
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run_test("new instances", test_newinstance)
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run_test("methods", test_method)
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run_test("functions", test_function)
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run_test("frames", test_frame)
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run_test("finalizers", test_finalizer)
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run_test("finalizers (new class)", test_finalizer_newclass)
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run_test("__del__", test_del)
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run_test("__del__ (new class)", test_del_newclass)
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run_test("saveall", test_saveall)
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run_test("trashcan", test_trashcan)
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run_test("boom", test_boom)
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run_test("boom2", test_boom2)
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run_test("get_referrents", test_get_referrents)
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def test():
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if verbose:
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print "disabling automatic collection"
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enabled = gc.isenabled()
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gc.disable()
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verify(not gc.isenabled())
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debug = gc.get_debug()
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gc.set_debug(debug & ~gc.DEBUG_LEAK) # this test is supposed to leak
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try:
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test_all()
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finally:
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gc.set_debug(debug)
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# test gc.enable() even if GC is disabled by default
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if verbose:
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print "restoring automatic collection"
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# make sure to always test gc.enable()
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gc.enable()
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verify(gc.isenabled())
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if not enabled:
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gc.disable()
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test()
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