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GH-96793: Change FOR_ITER to not pop the iterator on exhaustion. (GH-96801)

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Change FOR_ITER to have the same stack effect regardless of whether it branches or not.
Performance is unchanged as FOR_ITER (and specialized forms jump over the cleanup code).
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Mark Shannon 2022-10-27 03:55:03 -07:00 • committed by GitHub
parent e60892f9db
commit 22863df7ca
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14 changed files with 277 additions and 247 deletions
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Lib/test/test__opcode.py
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@ -40,7 +40,7 @@ class OpcodeTests(unittest.TestCase):
self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0, jump=False), -1)
FOR_ITER = dis.opmap['FOR_ITER']
self.assertEqual(stack_effect(FOR_ITER, 0), 1)
self.assertEqual(stack_effect(FOR_ITER, 0, jump=True), -1)
self.assertEqual(stack_effect(FOR_ITER, 0, jump=True), 1)
self.assertEqual(stack_effect(FOR_ITER, 0, jump=False), 1)
JUMP_FORWARD = dis.opmap['JUMP_FORWARD']
self.assertEqual(stack_effect(JUMP_FORWARD, 0), 0)