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gh-115999: Add free-threaded specialization for FOR_ITER (#128798)

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Add free-threaded versions of existing specialization for FOR_ITER (list, tuples, fast range iterators and generators), without significantly affecting their thread-safety. (Iterating over shared lists/tuples/ranges should be fine like before. Reusing iterators between threads is not fine, like before. Sharing generators between threads is a recipe for significant crashes, like before.)
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T. Wouters 2025-03-12 16:21:46 +01:00 • committed by GitHub
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commit de2f7da77d
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13 changed files with 469 additions and 125 deletions
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Python/optimizer.c
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@ -363,6 +363,7 @@ _PyUOp_Replacements[MAX_UOP_ID + 1] = {
[_ITER_JUMP_LIST] = _GUARD_NOT_EXHAUSTED_LIST,
[_ITER_JUMP_TUPLE] = _GUARD_NOT_EXHAUSTED_TUPLE,
[_FOR_ITER] = _FOR_ITER_TIER_TWO,
[_ITER_NEXT_LIST] = _ITER_NEXT_LIST_TIER_TWO,
};
static const uint8_t