Struct rustc_target::abi::LayoutS

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pub struct LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Idx, VariantIdx: Idx,
{ pub fields: FieldsShape<FieldIdx>, pub variants: Variants<FieldIdx, VariantIdx>, 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, }

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§fields: FieldsShape<FieldIdx>

Says where the fields are located within the layout.

§variants: Variants<FieldIdx, VariantIdx>

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. coroutines 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.

Implementations§

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impl<FieldIdx, VariantIdx> LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Idx, VariantIdx: Idx,

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pub fn scalar<C>(cx: &C, scalar: Scalar) -> LayoutS<FieldIdx, VariantIdx>
where C: HasDataLayout,

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impl<FieldIdx, VariantIdx> LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Idx, VariantIdx: Idx,

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pub fn is_unsized(&self) -> bool

Returns true if the layout corresponds to an unsized type.

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pub fn is_sized(&self) -> bool

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pub fn is_1zst(&self) -> bool

Returns true if the type is sized and a 1-ZST (meaning it has size 0 and alignment 1).

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pub fn is_zst(&self) -> bool

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

Note that this does not imply that the type is irrelevant for layout! It can still have non-trivial alignment constraints. You probably want to use is_1zst instead.

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pub fn eq_abi(&self, other: &LayoutS<FieldIdx, VariantIdx>) -> bool

Checks if these two Layout are equal enough to be considered “the same for all function call ABIs”. Note however that real ABIs depend on more details that are not reflected in the Layout; the PassMode need to be compared as well.

Trait Implementations§

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impl<FieldIdx, VariantIdx> Clone for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Clone + Idx, VariantIdx: Clone + Idx,

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fn clone(&self) -> LayoutS<FieldIdx, VariantIdx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<FieldIdx, VariantIdx> Debug for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Idx, VariantIdx: Idx, FieldsShape<FieldIdx>: Debug, Variants<FieldIdx, VariantIdx>: Debug,

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

Formats the value using the given formatter. Read more
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impl<FieldIdx, VariantIdx> Hash for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Hash + Idx, VariantIdx: Hash + Idx,

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<FieldIdx, VariantIdx, __CTX> HashStable<__CTX> for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Idx + HashStable<__CTX>, VariantIdx: Idx + HashStable<__CTX>, __CTX: HashStableContext,

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

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impl<FieldIdx, VariantIdx> PartialEq for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: PartialEq + Idx, VariantIdx: PartialEq + Idx,

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

This method tests for self and other values to be equal, and is used by ==.
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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.
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impl<FieldIdx, VariantIdx> Eq for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Eq + Idx, VariantIdx: Eq + Idx,

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impl<FieldIdx, VariantIdx> StructuralPartialEq for LayoutS<FieldIdx, VariantIdx>
where FieldIdx: Idx, VariantIdx: Idx,

Auto Trait Implementations§

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impl<FieldIdx, VariantIdx> Freeze for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Freeze,

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impl<FieldIdx, VariantIdx> RefUnwindSafe for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: RefUnwindSafe,

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impl<FieldIdx, VariantIdx> Send for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Send,

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impl<FieldIdx, VariantIdx> Sync for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Sync,

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impl<FieldIdx, VariantIdx> Unpin for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Unpin,

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impl<FieldIdx, VariantIdx> UnwindSafe for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: UnwindSafe,

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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.