Staging
v0.5.1
v0.5.1
https://github.com/python/cpython
Tip revision: 3398dcb14f6d43bf1619f7c32fe8d888c354e6b2 authored by Ned Deily on 05 December 2017, 08:26:08 UTC
Bump to 3.6.4rc1
Bump to 3.6.4rc1
Tip revision: 3398dcb
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()