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