[mypyc] Add SetElement op for initializing struct values #19437
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Also add Undef value type that can currently only used as the operand for SetElement to signify that we are creating a new value instead of modifying an existing value.
peturingi
reviewed
Jul 14, 2025
| # r1 now has new struct value with two fields set | ||
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| Warning: The generated code can use an arbitrary runtime values for | ||
| this (likely not explicitly initialized). |
peturingi
reviewed
Jul 14, 2025
| def __init__(self, src: Value, field: str, item: Value, line: int = -1) -> None: | ||
| super().__init__(line) | ||
| assert isinstance(src.type, RStruct), src.type | ||
| self.type = src.type |
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Irrelevant as it won't play nice with
def visit_set_element(self, op: SetElement) -> None:
op.src = self.fix_op(op.src)
peturingi
approved these changes
Jul 14, 2025
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Also add Undef value type that can currently only used as the
operand for SetElement to signify that we are creating a new
value instead of modifying an existing value.
A new struct value can be created by starting with Undef and
setting each element sequentially. Each operation produces a
new struct value, but the temporaries will be optimized away
in the later passes (currently by the C compiler, but we could
do something more clever here in the future).
This is needed to support packed arrays, which are represented
as structs. I extracted this from my packed array branch, and
it's currently unused outside tests.