gh-106529: Split FOR_ITER_{LIST,TUPLE} into uops #106696
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@iritkatriel Do you have time to look at the reservation code? The rest is on auto-pilot (I'm going to add FOR_ITER_TUPLE to the same PR. |
gvanrossum
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iritkatriel
reviewed
Jul 13, 2023
| @@ -378,13 +378,17 @@ translate_bytecode_to_trace( | |||
| _Py_CODEUNIT *initial_instr = instr; | |||
| int trace_length = 0; | |||
| int max_length = buffer_size; | |||
| int reserved = 0; | |||
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The point of reserve is to make sure that you won't error out in the middle of an opcode's translation to uops?
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Correct. I'd rather reserve space ahead than having to bail out in the middle and undo some work already done (the undoing feels more brittle).
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Assuming the tests pass this time I'll just merge. |
kgdiem
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Jul 14, 2023
Also rename `_ITER_EXHAUSTED_XXX` to `_IS_ITER_EXHAUSTED_XXX` to make it clear this is a test.
gvanrossum
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Jul 15, 2023
The Tier 2 opcode _IS_ITER_EXHAUSTED_LIST (and _TUPLE) didn't set it->it_seq to NULL, causing a subtle bug that resulted in test_exhausted_iterator in list_tests.py to fail when running all tests with -Xuops. The bug was introduced in gh-106696. Added this as an explicit test. Also fixed the dependencies for ceval.o -- it depends on executor_cases.c.h.
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Same recipe as FOR_ITER_RANGE. I refactored the Tier 2 transformation code to handle similar cases. I had to fix a bug in the space reservation code, and decided to add some macros and an extra guard rail for that.