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

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Merged
markshannon merged 12 commits into from
Oct 27, 2022
Merged

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

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bf44755
Modify FOR_ITER to leave iterator on stack. Work in progress.
markshannon Sep 8, 2022
5bdef2b
Document change to FOR_ITER.
markshannon Sep 9, 2022
5250ffc
Merge branch 'main' into for-iter-no-pop
markshannon Sep 13, 2022
b807ef8
Add news.
markshannon Sep 13, 2022
d5dd9b4
Skip over POP_TOP at end of loop in specialized versions of FOR_ITER.
markshannon Oct 21, 2022
c9ff8b7
Merge branch 'main' into for-iter-no-pop
markshannon Oct 25, 2022
c5e9d2c
Fix up new POP_TOPs to have no location.
markshannon Oct 25, 2022
687833a
Merge branch 'main' into for-iter-no-pop
markshannon Oct 26, 2022
a575fc8
Add END_FOR instruction
markshannon Oct 26, 2022
63bd124
Fix up specialization of FOR_ITER
markshannon Oct 26, 2022
611685f
Fix tests
markshannon Oct 26, 2022
b6086b6
Add END_FOR to docs.
markshannon Oct 26, 2022
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Add END_FOR to docs.
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@markshannon
markshannon committed Oct 26, 2022
commit b6086b6fc0930191d52047560be77a220c4c2339
9 changes: 9 additions & 0 deletions Doc/library/dis.rst
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Expand Up @@ -413,6 +413,15 @@ The Python compiler currently generates the following bytecode instructions.
Removes the top-of-stack (TOS) item.


.. opcode:: END_FOR

Removes the top two values from the stack.
Equivalent to POP_TOP; POP_TOP.
Used to clean up at the end of loops, hence the name.

.. versionadded:: 3.12


.. opcode:: COPY (i)

Push the *i*-th item to the top of the stack. The item is not removed from its
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