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gh-92536: Compute unicode struct sizes to ensure MemError is raised #92867

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Merged
sweeneyde merged 1 commit into from
May 17, 2022
Merged

gh-92536: Compute unicode struct sizes to ensure MemError is raised #92867

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16 changes: 6 additions & 10 deletions Lib/test/test_unicode.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2370,14 +2370,9 @@ def test_expandtabs_optimization(self):
self.assertIs(s.expandtabs(), s)

def test_raiseMemError(self):
if struct.calcsize('P') == 8:
# 64 bits pointers
ascii_struct_size = 48
compact_struct_size = 72
else:
# 32 bits pointers
ascii_struct_size = 24
compact_struct_size = 36
null_byte = 1
ascii_struct_size = sys.getsizeof("a") - len("a") - null_byte
compact_struct_size = sys.getsizeof("\xff") - len("\xff") - null_byte

for char in ('a', '\xe9', '\u20ac', '\U0010ffff'):
code = ord(char)
Expand All @@ -2395,8 +2390,9 @@ def test_raiseMemError(self):
# be allocatable, given enough memory.
maxlen = ((sys.maxsize - struct_size) // char_size)
alloc = lambda: char * maxlen
self.assertRaises(MemoryError, alloc)
self.assertRaises(MemoryError, alloc)
with self.subTest(char=char):
self.assertRaises(MemoryError, alloc)
self.assertRaises(MemoryError, alloc)

def test_format_subclass(self):
class S(str):
Expand Down