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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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9
Lib/test/test_peepholer.py
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@ -175,8 +175,15 @@ class TestTranforms(BytecodeTestCase):
self.assertInBytecode(code, 'LOAD_CONST', 'b')
# Verify that large sequences do not result from folding
code = compile('a="x"*1000', '', 'single')
code = compile('a="x"*10000', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', 10000)
self.assertNotIn("x"*10000, code.co_consts)
code = compile('a=1<<1000', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', 1000)
self.assertNotIn(1<<1000, code.co_consts)
code = compile('a=2**1000', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', 1000)
self.assertNotIn(2**1000, code.co_consts)
def test_binary_subscr_on_unicode(self):
# valid code get optimized