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rust/src/test/ui/layout/zero-sized-array-enum-niche.stderr

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Fix the size of niche enums with ZST alignment For enums with an aligned ZST variant, like `[T; 0]`, the niche layout was not computing a sufficient size to be consistent with alignment. Now we pad that size up to the alignment, and also make sure to only use the niche variant's ABI when the size and alignment still match.
2022-07-30 12:45:48 -05:00
error: layout_of(std::result::Result<[u32; 0], bool>) = Layout {
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Initialized {
value: Int(
I8,
false,
),
valid_range: 0..=1,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [
Size(4 bytes),
],
memory_index: [
0,
],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align(4 bytes),
pref: $PREF_ALIGN,
},
size: Size(4 bytes),
},
Layout {
fields: Arbitrary {
offsets: [
Size(1 bytes),
],
memory_index: [
0,
],
},
variants: Single {
index: 1,
},
abi: Aggregate {
sized: true,
},
largest_niche: Some(
Niche {
offset: Size(1 bytes),
value: Int(
I8,
false,
),
valid_range: 0..=1,
},
),
align: AbiAndPrefAlign {
abi: Align(1 bytes),
pref: $PREF_ALIGN,
},
size: Size(2 bytes),
},
],
},
abi: Aggregate {
sized: true,
},
largest_niche: Some(
Niche {
offset: Size(0 bytes),
value: Int(
I8,
false,
),
valid_range: 0..=1,
},
),
align: AbiAndPrefAlign {
abi: Align(4 bytes),
pref: $PREF_ALIGN,
},
size: Size(4 bytes),
}
--> $DIR/zero-sized-array-enum-niche.rs:13:1
|
LL | type AlignedResult = Result<[u32; 0], bool>;
| ^^^^^^^^^^^^^^^^^^
error: layout_of(std::result::Result<[u32; 0], Packed<std::num::NonZeroU16>>) = Layout {
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Initialized {
value: Int(
I8,
false,
),
valid_range: 0..=1,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [
Size(4 bytes),
],
memory_index: [
0,
],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align(4 bytes),
pref: $PREF_ALIGN,
},
size: Size(4 bytes),
},
Layout {
fields: Arbitrary {
offsets: [
Size(1 bytes),
],
memory_index: [
0,
],
},
variants: Single {
index: 1,
},
abi: Aggregate {
sized: true,
},
largest_niche: Some(
Niche {
offset: Size(1 bytes),
value: Int(
I16,
false,
),
valid_range: 1..=65535,
},
),
align: AbiAndPrefAlign {
abi: Align(1 bytes),
pref: $PREF_ALIGN,
},
size: Size(3 bytes),
},
],
},
abi: Aggregate {
sized: true,
},
largest_niche: Some(
Niche {
offset: Size(0 bytes),
value: Int(
I8,
false,
),
valid_range: 0..=1,
},
),
align: AbiAndPrefAlign {
abi: Align(4 bytes),
pref: $PREF_ALIGN,
},
size: Size(4 bytes),
}
--> $DIR/zero-sized-array-enum-niche.rs:29:1
|
LL | type NicheLosesToTagged = Result<[u32; 0], Packed<std::num::NonZeroU16>>;
| ^^^^^^^^^^^^^^^^^^^^^^^
error: layout_of(std::result::Result<[u32; 0], Packed<U16IsZero>>) = Layout {
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Initialized {
value: Int(
I16,
false,
),
valid_range: 0..=1,
},
tag_encoding: Niche {
dataful_variant: 1,
niche_variants: 0..=0,
niche_start: 1,
},
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align(4 bytes),
pref: $PREF_ALIGN,
},
size: Size(0 bytes),
},
Layout {
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
variants: Single {
index: 1,
},
abi: Aggregate {
sized: true,
},
largest_niche: Some(
Niche {
offset: Size(0 bytes),
value: Int(
I16,
false,
),
valid_range: 0..=0,
},
),
align: AbiAndPrefAlign {
abi: Align(1 bytes),
pref: $PREF_ALIGN,
},
size: Size(2 bytes),
},
],
},
abi: Aggregate {
sized: true,
},
largest_niche: Some(
Niche {
offset: Size(0 bytes),
value: Int(
I16,
false,
),
valid_range: 0..=1,
},
),
align: AbiAndPrefAlign {
abi: Align(4 bytes),
pref: $PREF_ALIGN,
},
size: Size(4 bytes),
}
--> $DIR/zero-sized-array-enum-niche.rs:36:1
|
LL | type NicheWinsOverTagged = Result<[u32; 0], Packed<U16IsZero>>;
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 3 previous errors
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