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Add c_enum_min_bits to target spec

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This commit is contained in:
Manish Goregaokar 2021-08-10 18:34:13 +00:00
parent ae90dcf020
commit fd116c806a
6 changed files with 515 additions and 16 deletions
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34
src/test/ui/layout/thumb-enum.rs Normal file
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@ -0,0 +1,34 @@
// compile-flags: --target thumbv8m.main-none-eabihf
// needs-llvm-components: arm
//
// Verify that thumb targets implement the repr(C) for enums correctly.
//
// See #87917
#![feature(never_type, rustc_attrs, no_core, lang_items)]
#![crate_type = "lib"]
#![no_core]
#[lang="sized"]
trait Sized {}
#[rustc_layout(debug)]
#[repr(C)]
enum A { Apple } //~ ERROR: layout_of
#[rustc_layout(debug)]
#[repr(C)]
enum B { Banana = 255, } //~ ERROR: layout_of
#[rustc_layout(debug)]
#[repr(C)]
enum C { Chaenomeles = 256, } //~ ERROR: layout_of
#[rustc_layout(debug)]
#[repr(C)]
enum P { Peach = 0x1000_0000isize, } //~ ERROR: layout_of
const TANGERINE: usize = 0x8100_0000; // hack to get negative numbers without negation operator!
#[rustc_layout(debug)]
#[repr(C)]
enum T { Tangerine = TANGERINE as isize } //~ ERROR: layout_of

442
src/test/ui/layout/thumb-enum.stderr Normal file
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@ -0,0 +1,442 @@
error: layout_of(A) = Layout {
fields: Arbitrary {
offsets: [
Size {
raw: 0,
},
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Scalar {
value: Int(
I8,
false,
),
valid_range: 0..=0,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [],
memory_index: [],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 0,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 1,
},
},
],
},
abi: Scalar(
Scalar {
value: Int(
I8,
false,
),
valid_range: 0..=0,
},
),
largest_niche: Some(
Niche {
offset: Size {
raw: 0,
},
scalar: Scalar {
value: Int(
I8,
false,
),
valid_range: 0..=0,
},
},
),
align: AbiAndPrefAlign {
abi: Align {
pow2: 0,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 1,
},
}
--> $DIR/thumb-enum.rs:16:1
|
LL | enum A { Apple }
| ^^^^^^^^^^^^^^^^
error: layout_of(B) = Layout {
fields: Arbitrary {
offsets: [
Size {
raw: 0,
},
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Scalar {
value: Int(
I8,
false,
),
valid_range: 255..=255,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [],
memory_index: [],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 0,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 1,
},
},
],
},
abi: Scalar(
Scalar {
value: Int(
I8,
false,
),
valid_range: 255..=255,
},
),
largest_niche: Some(
Niche {
offset: Size {
raw: 0,
},
scalar: Scalar {
value: Int(
I8,
false,
),
valid_range: 255..=255,
},
},
),
align: AbiAndPrefAlign {
abi: Align {
pow2: 0,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 1,
},
}
--> $DIR/thumb-enum.rs:20:1
|
LL | enum B { Banana = 255, }
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: layout_of(C) = Layout {
fields: Arbitrary {
offsets: [
Size {
raw: 0,
},
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Scalar {
value: Int(
I16,
false,
),
valid_range: 256..=256,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [],
memory_index: [],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 1,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 2,
},
},
],
},
abi: Scalar(
Scalar {
value: Int(
I16,
false,
),
valid_range: 256..=256,
},
),
largest_niche: Some(
Niche {
offset: Size {
raw: 0,
},
scalar: Scalar {
value: Int(
I16,
false,
),
valid_range: 256..=256,
},
},
),
align: AbiAndPrefAlign {
abi: Align {
pow2: 1,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 2,
},
}
--> $DIR/thumb-enum.rs:24:1
|
LL | enum C { Chaenomeles = 256, }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: layout_of(P) = Layout {
fields: Arbitrary {
offsets: [
Size {
raw: 0,
},
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Scalar {
value: Int(
I32,
false,
),
valid_range: 268435456..=268435456,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [],
memory_index: [],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 2,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 4,
},
},
],
},
abi: Scalar(
Scalar {
value: Int(
I32,
false,
),
valid_range: 268435456..=268435456,
},
),
largest_niche: Some(
Niche {
offset: Size {
raw: 0,
},
scalar: Scalar {
value: Int(
I32,
false,
),
valid_range: 268435456..=268435456,
},
},
),
align: AbiAndPrefAlign {
abi: Align {
pow2: 2,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 4,
},
}
--> $DIR/thumb-enum.rs:28:1
|
LL | enum P { Peach = 0x1000_0000isize, }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: layout_of(T) = Layout {
fields: Arbitrary {
offsets: [
Size {
raw: 0,
},
],
memory_index: [
0,
],
},
variants: Multiple {
tag: Scalar {
value: Int(
I32,
true,
),
valid_range: 2164260864..=2164260864,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
fields: Arbitrary {
offsets: [],
memory_index: [],
},
variants: Single {
index: 0,
},
abi: Aggregate {
sized: true,
},
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 2,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 4,
},
},
],
},
abi: Scalar(
Scalar {
value: Int(
I32,
true,
),
valid_range: 2164260864..=2164260864,
},
),
largest_niche: Some(
Niche {
offset: Size {
raw: 0,
},
scalar: Scalar {
value: Int(
I32,
true,
),
valid_range: 2164260864..=2164260864,
},
},
),
align: AbiAndPrefAlign {
abi: Align {
pow2: 2,
},
pref: Align {
pow2: 2,
},
},
size: Size {
raw: 4,
},
}
--> $DIR/thumb-enum.rs:34:1
|
LL | enum T { Tangerine = TANGERINE as isize }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 5 previous errors