bpo-46471: use global singletons for single byte bytes objects #30781
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gvanrossum
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How many of these do you see in deepfreeze.c? Singletons byte literals aren’t that common I guess.
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❯ cat Python/deepfreeze/deepfreeze.c | grep "(PyObject \*)&_Py_SINGLETON(bytes_characters" | wc -l
200 |
raghavthind2005
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Jan 23, 2022
gvanrossum
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Ah, I see. co_localspluskinds is a bytes object (flags for args and local vars) and when there's exactly one of those, it qualifies. Clever.
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By using global singletons for single byte bytes objects in deepfreeze, there is no need to generate c code for it so it reduces the size of generated c file and reduces memory use of the objects when they are allocated on the heap as now they are statically allocated and they are already immortal.
https://bugs.python.org/issue46471