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[WIP] Add int __sizeof__ implementation #1172

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[WIP] Add int __sizeof__ implementation #1172

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0484bf2
Add hacky __sizeof__ implementation
Askaholic Jul 24, 2019
bd60f41
Clean up formatting, and pointer cast
Askaholic Jul 28, 2019
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15 changes: 15 additions & 0 deletions vm/src/obj/objint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -499,6 +499,21 @@ impl PyInt {
!self.value.is_zero()
}

#[pymethod(name = "__sizeof__")]
fn sizeof(&self, _vm: &VirtualMachine) -> usize {
// We would like to get self.value.data.data.capacity(), however, this is private so we
// need to use a hack instead
let capacity = unsafe {
// Grab a reference to the underlying vector. This relies on the compiler always placing
// the BigUInt and its data vector directly at the start of their containing structs.
let data = &*(&self.value as *const BigInt as *const Vec<u32>);
data.capacity()
};

// We would like to do std::mem::size_of::<BigDigit>(), but of course BigDigit is private.
std::mem::size_of::<Self>() + capacity * std::mem::size_of::<u32>()
}

#[pymethod]
fn bit_length(&self, _vm: &VirtualMachine) -> usize {
self.value.bits()
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