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feat: Render padding information when hovering on structs

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Shoyu Vanilla 2025-05-28 11:15:33 +09:00
parent 7230ded9c7
commit e806957098
7 changed files with 272 additions and 23 deletions
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53
crates/hir/src/lib.rs
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@ -5972,6 +5972,59 @@ impl Layout {
}
}
pub fn tail_padding(&self, field_size: &mut impl FnMut(usize) -> Option<u64>) -> Option<u64> {
match self.0.fields {
layout::FieldsShape::Primitive => None,
layout::FieldsShape::Union(_) => None,
layout::FieldsShape::Array { stride, count } => count.checked_sub(1).and_then(|tail| {
let tail_field_size = field_size(tail as usize)?;
let offset = stride.bytes() * tail;
self.0.size.bytes().checked_sub(offset)?.checked_sub(tail_field_size)
}),
layout::FieldsShape::Arbitrary { ref offsets, ref memory_index } => {
let tail = memory_index.last_index()?;
let tail_field_size = field_size(tail.0.into_raw().into_u32() as usize)?;
let offset = offsets.get(tail)?.bytes();
self.0.size.bytes().checked_sub(offset)?.checked_sub(tail_field_size)
}
}
}
pub fn largest_padding(
&self,
field_size: &mut impl FnMut(usize) -> Option<u64>,
) -> Option<u64> {
match self.0.fields {
layout::FieldsShape::Primitive => None,
layout::FieldsShape::Union(_) => None,
layout::FieldsShape::Array { stride: _, count: 0 } => None,
layout::FieldsShape::Array { stride, .. } => {
let size = field_size(0)?;
stride.bytes().checked_sub(size)
}
layout::FieldsShape::Arbitrary { ref offsets, ref memory_index } => {
let mut reverse_index = vec![None; memory_index.len()];
for (src, (mem, offset)) in memory_index.iter().zip(offsets.iter()).enumerate() {
reverse_index[*mem as usize] = Some((src, offset.bytes()));
}
if reverse_index.iter().any(|it| it.is_none()) {
stdx::never!();
return None;
}
reverse_index
.into_iter()
.flatten()
.chain(std::iter::once((0, self.0.size.bytes())))
.tuple_windows()
.filter_map(|((i, start), (_, end))| {
let size = field_size(i)?;
end.checked_sub(start)?.checked_sub(size)
})
.max()
}
}
}
pub fn enum_tag_size(&self) -> Option<usize> {
let tag_size =
if let layout::Variants::Multiple { tag, tag_encoding, .. } = &self.0.variants {