Struct rustc_target::abi::LayoutS
source · pub struct LayoutS {
pub fields: FieldsShape,
pub variants: Variants,
pub abi: Abi,
pub largest_niche: Option<Niche>,
pub align: AbiAndPrefAlign,
pub size: Size,
pub max_repr_align: Option<Align>,
pub unadjusted_abi_align: Align,
}
Fields§
§fields: FieldsShape
Says where the fields are located within the layout.
variants: Variants
Encodes information about multi-variant layouts.
Even with Multiple
variants, a layout still has its own fields! Those are then
shared between all variants. One of them will be the discriminant,
but e.g. generators can have more.
To access all fields of this layout, both fields
and the fields of the active variant
must be taken into account.
abi: Abi
The abi
defines how this data is passed between functions, and it defines
value restrictions via valid_range
.
Note that this is entirely orthogonal to the recursive structure defined by
variants
and fields
; for example, ManuallyDrop<Result<isize, isize>>
has
Abi::ScalarPair
! So, even with non-Aggregate
abi
, fields
and variants
have to be taken into account to find all fields of this layout.
largest_niche: Option<Niche>
The leaf scalar with the largest number of invalid values
(i.e. outside of its valid_range
), if it exists.
align: AbiAndPrefAlign
§size: Size
§max_repr_align: Option<Align>
The largest alignment explicitly requested with repr(align)
on this type or any field.
Only used on i686-windows, where the argument passing ABI is different when alignment is
requested, even if the requested alignment is equal to the natural alignment.
unadjusted_abi_align: Align
The alignment the type would have, ignoring any repr(align)
but including repr(packed)
.
Only used on aarch64-linux, where the argument passing ABI ignores the requested alignment
in some cases.
Auto Trait Implementations§
impl RefUnwindSafe for LayoutS
impl Send for LayoutS
impl Sync for LayoutS
impl Unpin for LayoutS
impl UnwindSafe for LayoutS
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 352 bytes