Struct wasmtime::StructRefPre

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pub struct StructRefPre { /* private fields */ }
Expand description

An allocator for a particular Wasm GC struct type.

Every StructRefPre is associated with a particular Store and a particular StructType.

Reusing an allocator across many allocations amortizes some per-type runtime overheads inside Wasmtime. A StructRefPre is to StructRefs as an InstancePre is to Instances.

§Example

use wasmtime::*;

let mut config = Config::new();
config.wasm_function_references(true);
config.wasm_gc(true);

let engine = Engine::new(&config)?;
let mut store = Store::new(&engine, ());

// Define a struct type.
let struct_ty = StructType::new(
   store.engine(),
   [FieldType::new(Mutability::Var, StorageType::I8)],
)?;

// Create an allocator for the struct type.
let allocator = StructRefPre::new(&mut store, struct_ty);

{
    let mut scope = RootScope::new(&mut store);

    // Allocate a bunch of instances of our struct type using the same
    // allocator! This is faster than creating a new allocator for each
    // instance we want to allocate.
    for i in 0..10 {
        StructRef::new(&mut scope, &allocator, &[Val::I32(i)])?;
    }
}

Implementations§

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impl StructRefPre

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pub fn new(store: impl AsContextMut, ty: StructType) -> Self

Create a new StructRefPre that is associated with the given store and type.

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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
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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
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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> 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
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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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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<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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type Output = T

Should always be Self
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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
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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.