pub enum OperandValue<V> {
    Ref(V, Option<V>, Align),
    Immediate(V),
    Pair(V, V),
    ZeroSized,
}
Expand description

The representation of a Rust value. The enum variant is in fact uniquely determined by the value’s type, but is kept as a safety check.

Variants§

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Ref(V, Option<V>, Align)

A reference to the actual operand. The data is guaranteed to be valid for the operand’s lifetime. The second value, if any, is the extra data (vtable or length) which indicates that it refers to an unsized rvalue.

An OperandValue has this variant for types which are neither Immediate nor Pairs. The backend value in this variant must be a pointer to the non-immediate backend type. That pointee type is the one returned by LayoutTypeMethods::backend_type.

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Immediate(V)

A single LLVM immediate value.

An OperandValue must be this variant for any type for which LayoutTypeMethods::is_backend_immediate returns true. The backend value in this variant must be the immediate backend type, as returned by LayoutTypeMethods::immediate_backend_type.

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Pair(V, V)

A pair of immediate LLVM values. Used by fat pointers too.

An OperandValue must be this variant for any type for which LayoutTypeMethods::is_backend_scalar_pair returns true. The backend values in this variant must be the immediate backend types, as returned by LayoutTypeMethods::scalar_pair_element_backend_type with immediate: true.

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ZeroSized

A value taking no bytes, and which therefore needs no LLVM value at all.

If you ever need a V to pass to something, get a fresh poison value from ConstMethods::const_poison.

An OperandValue must be this variant for any type for which is_zst on its Layout returns true. Note however that these values can still require alignment.

Implementations§

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impl<'a, 'tcx, V: CodegenObject> OperandValue<V>

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pub fn poison<Bx: BuilderMethods<'a, 'tcx, Value = V>>( bx: &mut Bx, layout: TyAndLayout<'tcx> ) -> OperandValue<V>

Returns an OperandValue that’s generally UB to use in any way.

Depending on the layout, returns ZeroSized for ZSTs, an Immediate or Pair containing poison value(s), or a Ref containing a poison pointer.

Supports sized types only.

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pub fn store<Bx: BuilderMethods<'a, 'tcx, Value = V>>( self, bx: &mut Bx, dest: PlaceRef<'tcx, V> )

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pub fn volatile_store<Bx: BuilderMethods<'a, 'tcx, Value = V>>( self, bx: &mut Bx, dest: PlaceRef<'tcx, V> )

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pub fn unaligned_volatile_store<Bx: BuilderMethods<'a, 'tcx, Value = V>>( self, bx: &mut Bx, dest: PlaceRef<'tcx, V> )

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pub fn nontemporal_store<Bx: BuilderMethods<'a, 'tcx, Value = V>>( self, bx: &mut Bx, dest: PlaceRef<'tcx, V> )

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fn store_with_flags<Bx: BuilderMethods<'a, 'tcx, Value = V>>( self, bx: &mut Bx, dest: PlaceRef<'tcx, V>, flags: MemFlags )

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pub fn store_unsized<Bx: BuilderMethods<'a, 'tcx, Value = V>>( self, bx: &mut Bx, indirect_dest: PlaceRef<'tcx, V> )

Trait Implementations§

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impl<V: Clone> Clone for OperandValue<V>

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

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<V: Debug> Debug for OperandValue<V>

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

Formats the value using the given formatter. Read more
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impl<V: Copy> Copy for OperandValue<V>

Auto Trait Implementations§

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impl<V> DynSend for OperandValue<V>
where V: DynSend,

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impl<V> DynSync for OperandValue<V>
where V: DynSync,

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impl<V> RefUnwindSafe for OperandValue<V>
where V: RefUnwindSafe,

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impl<V> Send for OperandValue<V>
where V: Send,

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impl<V> Sync for OperandValue<V>
where V: Sync,

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impl<V> Unpin for OperandValue<V>
where V: Unpin,

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impl<V> UnwindSafe for OperandValue<V>
where V: 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<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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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, 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<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<P> IntoQueryParam<P> for 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<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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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<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.