wasmtime_environ

Struct GcArrayLayout

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pub struct GcArrayLayout {
    pub base_size: u32,
    pub align: u32,
    pub elem_size: u32,
}
Expand description

The layout of a GC-managed array.

This layout is only valid for use with the GC runtime that created it. It is not valid to use one GC runtime’s layout with another GC runtime, doing so is memory safe but will lead to general incorrectness like panics and wrong results.

All offsets are from the start of the object; that is, the size of the GC header (for example) is included in the offset.

All arrays are composed of the generic VMGcHeader, followed by collector-specific fields, followed by the contiguous array elements themselves. The array elements must be aligned to the element type’s natural alignment.

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§base_size: u32

The size of this array object, without any elements.

The array’s elements, if any, must begin at exactly this offset.

§align: u32

The alignment of this array.

§elem_size: u32

The size and natural alignment of each element in this array.

Implementations§

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impl GcArrayLayout

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pub fn size_for_len(&self, len: u32) -> u32

Get the total size of this array for a given length of elements.

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pub fn elem_offset(&self, i: u32) -> u32

Get the offset of the ith element in an array with this layout.

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pub fn layout(&self, len: u32) -> Layout

Get a core::alloc::Layout for an array of this type with the given length.

Trait Implementations§

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impl Clone for GcArrayLayout

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fn clone(&self) -> GcArrayLayout

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 Debug for GcArrayLayout

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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 From<GcArrayLayout> for GcLayout

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fn from(layout: GcArrayLayout) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

Blanket Implementations§

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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<T> CloneToUninit for T
where T: Clone,

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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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> 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.