Immutable Tuples as C Structs, not pointers #248
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Turn immutable tuples into C structs, and keep mutable tuples as C pointers.
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While doing this PR, I have been stomping out other bugs, including stuff from my own codegen tests import numpy as np
import numpy.ctypeslib as ctl
a = np.int64(2)
b = np.int64(1)
s1 = ctl.as_ctypes(a)
s2 = ctl.as_ctypes(b)
print(s1.value, s2.value)
# this prints 1 1 :skull: |
willow-ahrens
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Dec 1, 2025
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Looks good, I would only ask for an ImmutableFType class-based interface.
Even though literally everything should be immutable right now
mtsokol
reviewed
Dec 2, 2025
src/finchlite/codegen/c.py
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| def scalar_to_ctypes_copy(fmt, obj): | ||
| """ | ||
| This hack is required because it turns out that scalars don't own memory or smth |
src/finchlite/codegen/c.py
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| import numpy as np | ||
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| from finchlite.finch_assembly.struct import MutableStructFType |
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Nitpick: Let's use one convention, with relative import as below.
| np.generic, | ||
| "serialize_to_c", | ||
| "__attr__", | ||
| lambda fmt, obj: np.ctypeslib.as_ctypes(obj), |
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Can we have it as np.ctypeslib.as_ctypes(np.array(obj)), instead? It looks that 0-d arrays print your example correctly. Then we shouldn't need scalar_to_ctypes_copy.
willow-ahrens
approved these changes
Dec 3, 2025
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Turn immutable tuples into C structs, and keep mutable tuples as C pointers.