mirror of
https://github.com/python/cpython.git
synced 2025-11-04 07:31:38 +00:00
89 lines
2.2 KiB
Python
89 lines
2.2 KiB
Python
|
#! /usr/bin/env python
|
||
|
|
"""Find the maximum recursion limit that prevents core dumps
|
||
|
|
|
||
|
|
This script finds the maximum safe recursion limit on a particular
|
||
|
|
platform. If you need to change the recursion limit on your system,
|
||
|
|
this script will tell you a safe upper bound. To use the new limit,
|
||
|
|
call sys.setrecursionlimit.
|
||
|
|
|
||
|
|
This module implements several ways to create infinite recursion in
|
||
|
|
Python. Different implementations end up pushing different numbers of
|
||
|
|
C stack frames, depending on how many calls through Python's abstract
|
||
|
|
C API occur.
|
||
|
|
|
||
|
|
After each round of tests, it prints a message
|
||
|
|
Limit of NNNN is fine.
|
||
|
|
|
||
|
|
It ends when Python causes a segmentation fault because the limit is
|
||
|
|
too high. On platforms like Mac and Windows, it should exit with a
|
||
|
|
MemoryError.
|
||
|
|
|
||
|
|
NB: A program that does not use __methods__ can set a higher limit.
|
||
|
|
"""
|
||
|
|
|
||
|
|
import sys
|
||
|
|
|
||
|
|
class RecursiveBlowup1:
|
||
|
|
def __init__(self):
|
||
|
|
self.__init__()
|
||
|
|
|
||
|
|
def test_init():
|
||
|
|
return RecursiveBlowup1()
|
||
|
|
|
||
|
|
class RecursiveBlowup2:
|
||
|
|
def __repr__(self):
|
||
|
|
return repr(self)
|
||
|
|
|
||
|
|
def test_repr():
|
||
|
|
return repr(RecursiveBlowup2())
|
||
|
|
|
||
|
|
class RecursiveBlowup4:
|
||
|
|
def __add__(self, x):
|
||
|
|
return x + self
|
||
|
|
|
||
|
|
def test_add():
|
||
|
|
return RecursiveBlowup4() + RecursiveBlowup4()
|
||
|
|
|
||
|
|
class RecursiveBlowup5:
|
||
|
|
def __getattr__(self, attr):
|
||
|
|
return getattr(self, attr)
|
||
|
|
|
||
|
|
def test_getattr():
|
||
|
|
return RecursiveBlowup5().attr
|
||
|
|
|
||
|
|
class RecursiveBlowup6:
|
||
|
|
def __getitem__(self, item):
|
||
|
|
return self[item - 2] + self[item - 1]
|
||
|
|
|
||
|
|
def test_getitem():
|
||
|
|
return RecursiveBlowup6()[5]
|
||
|
|
|
||
|
|
def test_recurse():
|
||
|
|
return test_recurse()
|
||
|
|
|
||
|
|
def check_limit(n, test_func_name):
|
||
|
|
sys.setrecursionlimit(n)
|
||
|
|
if test_func_name.startswith("test_"):
|
||
|
|
print test_func_name[5:]
|
||
|
|
else:
|
||
|
|
print test_func_name
|
||
|
|
test_func = globals()[test_func_name]
|
||
|
|
try:
|
||
|
|
test_func()
|
||
|
|
except RuntimeError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
print "Yikes!"
|
||
|
|
|
||
|
|
limit = 1000
|
||
|
|
while 1:
|
||
|
|
check_limit(limit, "test_recurse")
|
||
|
|
check_limit(limit, "test_add")
|
||
|
|
check_limit(limit, "test_repr")
|
||
|
|
check_limit(limit, "test_init")
|
||
|
|
check_limit(limit, "test_getattr")
|
||
|
|
check_limit(limit, "test_getitem")
|
||
|
|
print "Limit of %d is fine" % limit
|
||
|
|
limit = limit + 100
|
||
|
|
|