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c62b95e550
takes much longer to run in the context of the test suite than when run in isolation. That's because it forces a large number of full collections, which take time proportional to the total number of gc'ed objects in the whole system. But since the dangerous implementation trickery that caused this test to fail in 2.0, 2.1 and 2.2 doesn't exist in 2.3 anymore (the trashcan mechanism stopped doing evil things when the possibility for compiling without cyclic gc was taken away), such an expensive test is no longer justified. This checkin leaves the test intact, but fiddles the constants to reduce the runtime by about a factor of 5.
255 lines
6.1 KiB
Python
255 lines
6.1 KiB
Python
from test_support import verify, verbose, TestFailed
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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 %d, expected %d" % (
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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_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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debug = gc.get_debug()
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gc.set_debug(debug | gc.DEBUG_SAVEALL)
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l = []
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l.append(l)
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id_l = id(l)
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del l
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gc.collect()
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try:
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for obj in gc.garbage:
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if id(obj) == id_l:
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del obj[:]
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break
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else:
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raise TestFailed, "didn't find obj in garbage (saveall)"
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gc.garbage.remove(obj)
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finally:
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gc.set_debug(debug)
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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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apply(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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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("__del__", test_del)
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run_test("saveall", test_saveall)
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run_test("trashcan", test_trashcan)
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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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