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This commit is contained in:
Folkert 2021-11-05 21:30:20 +01:00
parent 51756cbc89
commit 5cd232816b
8 changed files with 337 additions and 156 deletions
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50
compiler/mono/src/layout.rs
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@ -863,6 +863,16 @@ impl<'a> Layout<'a> {
false
}
pub fn is_passed_by_reference(&self) -> bool {
match self {
Layout::Union(UnionLayout::NonRecursive(_)) => true,
Layout::LambdaSet(lambda_set) => {
lambda_set.runtime_representation().is_passed_by_reference()
}
_ => false,
}
}
pub fn stack_size(&self, pointer_size: u32) -> u32 {
let width = self.stack_size_without_alignment(pointer_size);
let alignment = self.alignment_bytes(pointer_size);
@ -941,16 +951,16 @@ impl<'a> Layout<'a> {
})
.max();
let tag_id_builtin = variant.tag_id_builtin();
match max_alignment {
Some(align) => {
let tag_id_builtin = variant.tag_id_builtin();
round_up_to_alignment(
align,
tag_id_builtin.alignment_bytes(pointer_size),
)
Some(align) => round_up_to_alignment(
align.max(tag_id_builtin.alignment_bytes(pointer_size)),
tag_id_builtin.alignment_bytes(pointer_size),
),
None => {
// none of the tags had any payload, but the tag id still contains information
tag_id_builtin.alignment_bytes(pointer_size)
}
None => 0,
}
}
Recursive(_)
@ -2675,3 +2685,27 @@ impl<'a> std::convert::TryFrom<&Layout<'a>> for ListLayout<'a> {
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn width_and_alignment_union_empty_struct() {
let lambda_set = LambdaSet {
set: &[(Symbol::LIST_MAP, &[])],
representation: &Layout::Struct(&[]),
};
let a = &[Layout::Struct(&[])] as &[_];
let b = &[Layout::LambdaSet(lambda_set)] as &[_];
let tt = [a, b];
let layout = Layout::Union(UnionLayout::NonRecursive(&tt));
// at the moment, the tag id uses an I64, so
let ptr_width = 8;
assert_eq!(layout.stack_size(ptr_width), 8);
assert_eq!(layout.alignment_bytes(ptr_width), 8);
}
}