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bpo-30416: Protect the optimizer during constant folding. (#4860)

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It no longer spends much time doing complex calculations and no
longer consumes much memory for creating large constants that will
be dropped later.

This fixes also bpo-21074.
This commit is contained in:
Serhiy Storchaka 2017-12-15 14:11:43 +02:00 • committed by GitHub
parent a5552f023e
commit 2e3f570185
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4 changed files with 144 additions and 27 deletions
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3
Lib/test/test_memoryio.py
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@ -759,7 +759,8 @@ class CBytesIOTest(PyBytesIOTest):
check = self.check_sizeof
self.assertEqual(object.__sizeof__(io.BytesIO()), basesize)
check(io.BytesIO(), basesize )
check(io.BytesIO(b'a' * 1000), basesize + sys.getsizeof(b'a' * 1000))
n = 1000 # use a variable to prevent constant folding
check(io.BytesIO(b'a' * n), basesize + sys.getsizeof(b'a' * n))
# Various tests of copy-on-write behaviour for BytesIO.