pub enum PassMode {
    Ignore,
    Direct(ArgAttributes),
    Pair(ArgAttributesArgAttributes),
    Cast(Box<CastTarget, Global>, bool),
    Indirect {
        attrs: ArgAttributes,
        extra_attrs: Option<ArgAttributes>,
        on_stack: bool,
    },
}

Variants§

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Ignore

Ignore the argument.

The argument is either uninhabited or a ZST.

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Direct(ArgAttributes)

Pass the argument directly.

The argument has a layout abi of Scalar, Vector or in rare cases Aggregate.

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Pair(ArgAttributesArgAttributes)

Pass a pair’s elements directly in two arguments.

The argument has a layout abi of ScalarPair.

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Cast(Box<CastTarget, Global>, bool)

Pass the argument after casting it, to either a single uniform or a pair of registers. The bool indicates if a Reg::i32() dummy argument is emitted before the real argument.

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Indirect

Fields

§extra_attrs: Option<ArgAttributes>
§on_stack: bool

Pass the argument indirectly via a hidden pointer. The extra_attrs value, if any, is for the extra data (vtable or length) which indicates that it refers to an unsized rvalue. on_stack defines that the value should be passed at a fixed stack offset in accordance to the ABI rather than passed using a pointer. This corresponds to the byval LLVM argument attribute.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere
    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 Twhere
    T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
    U: From<T>,

const: unstable · source§

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, U> TryFrom<U> for Twhere
    U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere
    U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 40 bytes

Size for each variant:

  • Ignore: 0 bytes
  • Direct: 23 bytes
  • Pair: 39 bytes
  • Cast: 15 bytes
  • Indirect: 39 bytes