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Annotate panic! reasons during enum layout #118974

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merged 1 commit into from
Dec 15, 2023
Merged

Annotate panic! reasons during enum layout #118974

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20 changes: 14 additions & 6 deletions compiler/rustc_abi/src/layout.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -382,7 +382,7 @@ pub trait LayoutCalculator {
*offset += this_offset;
}
}
_ => {
FieldsShape::Primitive | FieldsShape::Array { .. } | FieldsShape::Union(..) => {
panic!("Layout of fields should be Arbitrary for variants")
}
}
Expand Down Expand Up @@ -600,7 +600,9 @@ pub trait LayoutCalculator {
variant.size = new_ity_size;
}
}
_ => panic!(),
FieldsShape::Primitive | FieldsShape::Array { .. } | FieldsShape::Union(..) => {
panic!("encountered a non-arbitrary layout during enum layout")
}
}
}
}
Expand Down Expand Up @@ -628,7 +630,7 @@ pub trait LayoutCalculator {
let mut common_prim_initialized_in_all_variants = true;
for (field_layouts, layout_variant) in iter::zip(variants, &layout_variants) {
let FieldsShape::Arbitrary { ref offsets, .. } = layout_variant.fields else {
panic!();
panic!("encountered a non-arbitrary layout during enum layout");
};
// We skip *all* ZST here and later check if we are good in terms of alignment.
// This lets us handle some cases involving aligned ZST.
Expand Down Expand Up @@ -681,7 +683,7 @@ pub trait LayoutCalculator {
assert_eq!(memory_index.raw, [0, 1]);
offsets
}
_ => panic!(),
_ => panic!("encountered a non-arbitrary layout during enum layout"),
};
if pair_offsets[FieldIdx::new(0)] == Size::ZERO
&& pair_offsets[FieldIdx::new(1)] == *offset
Expand Down Expand Up @@ -758,7 +760,9 @@ pub trait LayoutCalculator {
Variants::Multiple { tag, tag_encoding, tag_field, .. } => {
Variants::Multiple { tag, tag_encoding, tag_field, variants: best_layout.variants }
}
_ => panic!(),
Variants::Single { .. } => {
panic!("encountered a single-variant enum during multi-variant layout")
}
};
Some(best_layout.layout)
}
Expand Down Expand Up @@ -1154,7 +1158,11 @@ fn univariant<
assert_eq!(memory_index.raw, [0, 1]);
offsets
}
_ => panic!(),
FieldsShape::Primitive
| FieldsShape::Array { .. }
| FieldsShape::Union(..) => {
panic!("encountered a non-arbitrary layout during enum layout")
}
};
if offsets[i] == pair_offsets[FieldIdx::new(0)]
&& offsets[j] == pair_offsets[FieldIdx::new(1)]
Expand Down