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# mode: run
cimport cython
# Count number of times an object was deallocated twice. This should remain 0.
cdef int double_deallocations = 0
def assert_no_double_deallocations():
global double_deallocations
err = double_deallocations
double_deallocations = 0
assert not err
# Compute x = f(f(f(...(None)...))) nested n times and throw away the result.
# The real test happens when exiting this function: then a big recursive
# deallocation of x happens. We are testing two things in the tests below:
# that Python does not crash and that no double deallocation happens.
# See also https://github.com/python/cpython/pull/11841
def recursion_test(f, int n=2**20):
x = None
cdef int i
for i in range(n):
x = f(x)
@cython.trashcan(True)
cdef class Recurse:
"""
>>> recursion_test(Recurse)
>>> assert_no_double_deallocations()
"""
cdef public attr
cdef int deallocated
def __cinit__(self, x):
self.attr = x
def __dealloc__(self):
# Check that we're not being deallocated twice
global double_deallocations
double_deallocations += self.deallocated
self.deallocated = 1
cdef class RecurseSub(Recurse):
"""
>>> recursion_test(RecurseSub)
>>> assert_no_double_deallocations()
"""
cdef int subdeallocated
def __dealloc__(self):
# Check that we're not being deallocated twice
global double_deallocations
double_deallocations += self.subdeallocated
self.subdeallocated = 1
@cython.freelist(4)
@cython.trashcan(True)
cdef class RecurseFreelist:
"""
>>> recursion_test(RecurseFreelist)
>>> recursion_test(RecurseFreelist, 1000)
>>> assert_no_double_deallocations()
"""
cdef public attr
cdef int deallocated
def __cinit__(self, x):
self.attr = x
def __dealloc__(self):
# Check that we're not being deallocated twice
global double_deallocations
double_deallocations += self.deallocated
self.deallocated = 1
# Subclass of list => uses trashcan by default
# As long as https://github.com/python/cpython/pull/11841 is not fixed,
# this does lead to double deallocations, so we skip that check.
cdef class RecurseList(list):
"""
>>> RecurseList(42)
[42]
>>> recursion_test(RecurseList)
"""
def __init__(self, x):
super().__init__((x,))
# Some tests where the trashcan is NOT used. When the trashcan is not used
# in a big recursive deallocation, the __dealloc__s of the base classes are
# only run after the __dealloc__s of the subclasses.
# We use this to detect trashcan usage.
cdef int base_deallocated = 0
cdef int trashcan_used = 0
def assert_no_trashcan_used():
global base_deallocated, trashcan_used
err = trashcan_used
trashcan_used = base_deallocated = 0
assert not err
cdef class Base:
def __dealloc__(self):
global base_deallocated
base_deallocated = 1
# Trashcan disabled by default
cdef class Sub1(Base):
"""
>>> recursion_test(Sub1, 100)
>>> assert_no_trashcan_used()
"""
cdef public attr
def __cinit__(self, x):
self.attr = x
def __dealloc__(self):
global base_deallocated, trashcan_used
trashcan_used += base_deallocated
@cython.trashcan(True)
cdef class Middle(Base):
cdef public foo
# Trashcan disabled explicitly
@cython.trashcan(False)
cdef class Sub2(Middle):
"""
>>> recursion_test(Sub2, 1000)
>>> assert_no_trashcan_used()
"""
cdef public attr
def __cinit__(self, x):
self.attr = x
def __dealloc__(self):
global base_deallocated, trashcan_used
trashcan_used += base_deallocated
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