Struct rustc_abi::LayoutS

pub struct LayoutS<V: Idx> {
    pub fields: FieldsShape,
    pub variants: Variants<V>,
    pub abi: Abi,
    pub largest_niche: Option<Niche>,
    pub align: AbiAndPrefAlign,
    pub size: Size,
}

Fields

fields: FieldsShape

Says where the fields are located within the layout.

variants: Variants<V>

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

Implementations

impl<V: Idx> LayoutS<V>

pub fn scalar<C: HasDataLayout>(cx: &C, scalar: Scalar) -> Self

impl<V: Idx> LayoutS<V>

pub fn is_unsized(&self) -> bool

Returns true if the layout corresponds to an unsized type.

pub fn is_sized(&self) -> bool

pub fn is_zst(&self) -> bool

Returns true if the type is a ZST and not unsized.

Trait Implementations

impl<V: Clone + Idx> Clone for LayoutS<V>

fn clone(&self) -> LayoutS<V>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<V: Idx> Debug for LayoutS<V>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<V: Hash + Idx> Hash for LayoutS<V>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<V, __CTX> HashStable<__CTX> for LayoutS<V>where
    __CTX: HashStableContext,
    V: HashStable<__CTX> + Idx,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl<V: PartialEq + Idx> PartialEq<LayoutS<V>> for LayoutS<V>

fn eq(&self, other: &LayoutS<V>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<V: Eq + Idx> Eq for LayoutS<V>

impl<V: Idx> StructuralEq for LayoutS<V>

impl<V: Idx> StructuralPartialEq for LayoutS<V>

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.