Staging
v0.5.1
v0.5.1
https://github.com/python/cpython
Tip revision: 7e16af499b92def6fc4ab1bbcecd2c055a38de29 authored by Ned Deily on 10 October 2016, 20:09:08 UTC
Version bump for 3.6.0b2
Version bump for 3.6.0b2
Tip revision: 7e16af4
test_bigaddrspace.py
"""
These tests are meant to exercise that requests to create objects bigger
than what the address space allows are properly met with an OverflowError
(rather than crash weirdly).
Primarily, this means 32-bit builds with at least 2 GB of available memory.
You need to pass the -M option to regrtest (e.g. "-M 2.1G") for tests to
be enabled.
"""
from test import support
from test.support import bigaddrspacetest, MAX_Py_ssize_t
import unittest
import operator
import sys
class BytesTest(unittest.TestCase):
@bigaddrspacetest
def test_concat(self):
# Allocate a bytestring that's near the maximum size allowed by
# the address space, and then try to build a new, larger one through
# concatenation.
try:
x = b"x" * (MAX_Py_ssize_t - 128)
self.assertRaises(OverflowError, operator.add, x, b"x" * 128)
finally:
x = None
@bigaddrspacetest
def test_optimized_concat(self):
try:
x = b"x" * (MAX_Py_ssize_t - 128)
with self.assertRaises(OverflowError) as cm:
# this statement used a fast path in ceval.c
x = x + b"x" * 128
with self.assertRaises(OverflowError) as cm:
# this statement used a fast path in ceval.c
x += b"x" * 128
finally:
x = None
@bigaddrspacetest
def test_repeat(self):
try:
x = b"x" * (MAX_Py_ssize_t - 128)
self.assertRaises(OverflowError, operator.mul, x, 128)
finally:
x = None
class StrTest(unittest.TestCase):
unicodesize = 2 if sys.maxunicode < 65536 else 4
@bigaddrspacetest
def test_concat(self):
try:
# Create a string that would fill almost the address space
x = "x" * int(MAX_Py_ssize_t // (1.1 * self.unicodesize))
# Unicode objects trigger MemoryError in case an operation that's
# going to cause a size overflow is executed
self.assertRaises(MemoryError, operator.add, x, x)
finally:
x = None
@bigaddrspacetest
def test_optimized_concat(self):
try:
x = "x" * int(MAX_Py_ssize_t // (1.1 * self.unicodesize))
with self.assertRaises(MemoryError) as cm:
# this statement uses a fast path in ceval.c
x = x + x
with self.assertRaises(MemoryError) as cm:
# this statement uses a fast path in ceval.c
x += x
finally:
x = None
@bigaddrspacetest
def test_repeat(self):
try:
x = "x" * int(MAX_Py_ssize_t // (1.1 * self.unicodesize))
self.assertRaises(MemoryError, operator.mul, x, 2)
finally:
x = None
def test_main():
support.run_unittest(BytesTest, StrTest)
if __name__ == '__main__':
if len(sys.argv) > 1:
support.set_memlimit(sys.argv[1])
test_main()