# Struct rustc_codegen_llvm::abi::ArgAbi

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    pub struct ArgAbi<'a, Ty> {
        pub layout: TyAndLayout<'a, Ty>,
        pub mode: PassMode,
    }

Expand description

Information about how to pass an argument to, or return a value from, a function, under some ABI.

## Fields§

§`layout: TyAndLayout<'a, Ty>`§`mode: PassMode`

## Implementations§

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### impl<'a, Ty> ArgAbi<'a, Ty>

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#### pub fn new( cx: &impl HasDataLayout, layout: TyAndLayout<'a, Ty>, scalar_attrs: impl Fn(&TyAndLayout<'a, Ty>, Scalar, Size) -> ArgAttributes, ) -> ArgAbi<'a, Ty>

This defines the “default ABI” for that type, that is then later adjusted in `fn_abi_adjust_for_abi`.

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#### pub fn make_direct_deprecated(&mut self)

Pass this argument directly instead. Should NOT be used! Only exists because of past ABI mistakes that will take time to fix (see https://github.com/rust-lang/rust/issues/115666).

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#### pub fn make_indirect(&mut self)

Pass this argument indirectly, by passing a (thin or fat) pointer to the argument instead. This is valid for both sized and unsized arguments.

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#### pub fn make_indirect_byval(&mut self, byval_align: Option<Align>)

Pass this argument indirectly, by placing it at a fixed stack offset. This corresponds to the `byval` LLVM argument attribute. This is only valid for sized arguments.

`byval_align` specifies the alignment of the `byval` stack slot, which does not need to correspond to the type’s alignment. This will be `Some` if the target’s ABI specifies that stack slots used for arguments passed by-value have specific alignment requirements which differ from the alignment used in other situations.

If `None`, the type’s alignment is used.

If the resulting alignment differs from the type’s alignment, the argument will be copied to an alloca with sufficient alignment, either in the caller (if the type’s alignment is lower than the byval alignment) or in the callee (if the type’s alignment is higher than the byval alignment), to ensure that Rust code never sees an underaligned pointer.

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#### pub fn extend_integer_width_to(&mut self, bits: u64)

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#### pub fn cast_to<T>(&mut self, target: T)
where T: Into<CastTarget>,

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#### pub fn cast_to_and_pad_i32<T>(&mut self, target: T, pad_i32: bool)
where T: Into<CastTarget>,

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#### pub fn is_indirect(&self) -> bool

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#### pub fn is_sized_indirect(&self) -> bool

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#### pub fn is_unsized_indirect(&self) -> bool

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#### pub fn is_ignore(&self) -> bool

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#### pub fn eq_abi(&self, other: &ArgAbi<'a, Ty>) -> bool

Checks if these two `ArgAbi` are equal enough to be considered “the same for all function call ABIs”.

## Trait Implementations§

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### impl<'ll, 'tcx> ArgAbiExt<'ll, 'tcx> for ArgAbi<'tcx, Ty<'tcx>>

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#### fn memory_ty(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type

Gets the LLVM type for a place of the original Rust type of this argument/return, i.e., the result of `type_of::type_of`.

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#### fn store( &self, bx: &mut Builder<'_, 'll, 'tcx>, val: &'ll Value, dst: PlaceRef<'tcx, &'ll Value>, )

Stores a direct/indirect value described by this ArgAbi into a place for the original Rust type of this argument/return. Can be used for both storing formal arguments into Rust variables or results of call/invoke instructions into their destinations.

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#### fn store_fn_arg( &self, bx: &mut Builder<'_, 'll, 'tcx>, idx: &mut usize, dst: PlaceRef<'tcx, &'ll Value>, )

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### impl<'a, Ty> Clone for ArgAbi<'a, Ty>
where Ty: Clone,

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#### fn clone(&self) -> ArgAbi<'a, Ty>

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<'a, Ty> Debug for ArgAbi<'a, Ty>
where Ty: Display,

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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<'a, Ty> Hash for ArgAbi<'a, Ty>
where Ty: Hash,

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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<'a, Ty, __CTX> HashStable<__CTX> for ArgAbi<'a, Ty>
where __CTX: HashStableContext, Ty: HashStable<__CTX>,

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#### fn hash_stable( &self, __hcx: &mut __CTX, __hasher: &mut StableHasher<SipHasher128>, )

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### impl<'a, Ty> PartialEq for ArgAbi<'a, Ty>
where Ty: PartialEq,

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#### fn eq(&self, other: &ArgAbi<'a, Ty>) -> 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<'a, Ty> Eq for ArgAbi<'a, Ty>
where Ty: Eq,

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### impl<'a, Ty> StructuralPartialEq for ArgAbi<'a, Ty>

## Auto Trait Implementations§

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### impl<'a, Ty> DynSend for ArgAbi<'a, Ty>
where Ty: DynSend,

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### impl<'a, Ty> DynSync for ArgAbi<'a, Ty>
where Ty: DynSync,

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### impl<'a, Ty> Freeze for ArgAbi<'a, Ty>
where Ty: Freeze,

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### impl<'a, Ty> RefUnwindSafe for ArgAbi<'a, Ty>
where Ty: RefUnwindSafe,

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### impl<'a, Ty> Send for ArgAbi<'a, Ty>
where Ty: Send,

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### impl<'a, Ty> Sync for ArgAbi<'a, Ty>
where Ty: Sync,

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### impl<'a, Ty> Unpin for ArgAbi<'a, Ty>
where Ty: Unpin,

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### impl<'a, Ty> UnwindSafe for ArgAbi<'a, Ty>
where Ty: 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> AnyEq for T
where T: Any + PartialEq,

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#### fn equals(&self, other: &(dyn Any + 'static)) -> bool

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#### fn as_any(&self) -> &(dyn Any + 'static)

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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<T> CloneToUninit for T
where T: Clone,

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#### default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dst`. Read more
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### impl<T, R> CollectAndApply<T, R> for T

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#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to `f(&iter.collect::<Vec<_>>())`.

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#### type Output = R

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### impl<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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#### default fn fingerprint_style() -> FingerprintStyle

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#### default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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#### default fn to_debug_str(&self, _: Tcx) -> String

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#### default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given `DepNode`, something which is needed when forcing `DepNode`s during red-green evaluation. The query system will only call this method if `fingerprint_style()` is not `FingerprintStyle::Opaque`. It is always valid to return `None` here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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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> Filterable for T

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#### fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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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> IntoEither for T

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#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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### impl<P> IntoQueryParam<P> for P

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#### fn into_query_param(self) -> P

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### impl<T> MaybeResult<T> for T

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#### type Error = !

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#### fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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#### fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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### impl<T> Pointable for T

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#### const ALIGN: usize = _

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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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<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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#### fn upcast(self, interner: I) -> U

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### impl<I, T> UpcastFrom<I, T> for T

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#### fn upcast_from(from: T, _tcx: I) -> T

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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<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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#### default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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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,

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### impl<T> ErasedDestructor for T
where T: 'static,

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### impl<T> MaybeSendSync for T
where T: Send + Sync,

## 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.