Struct wasmtime::MemoryType

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pub struct MemoryType { /* private fields */ }
Available on crate feature runtime only.
Expand description

A descriptor for a WebAssembly memory type.

Memories are described in units of pages (64KB) and represent contiguous chunks of addressable memory.

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impl MemoryType

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pub fn new(minimum: u32, maximum: Option<u32>) -> MemoryType

Creates a new descriptor for a 32-bit WebAssembly memory given the specified limits of the memory.

The minimum and maximum values here are specified in units of WebAssembly pages, which are 64k.

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pub fn new64(minimum: u64, maximum: Option<u64>) -> MemoryType

Creates a new descriptor for a 64-bit WebAssembly memory given the specified limits of the memory.

The minimum and maximum values here are specified in units of WebAssembly pages, which are 64k.

Note that 64-bit memories are part of the memory64 proposal for WebAssembly which is not standardized yet.

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pub fn shared(minimum: u32, maximum: u32) -> MemoryType

Creates a new descriptor for shared WebAssembly memory given the specified limits of the memory.

The minimum and maximum values here are specified in units of WebAssembly pages, which are 64k.

Note that shared memories are part of the threads proposal for WebAssembly which is not standardized yet.

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pub fn is_64(&self) -> bool

Returns whether this is a 64-bit memory or not.

Note that 64-bit memories are part of the memory64 proposal for WebAssembly which is not standardized yet.

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pub fn is_shared(&self) -> bool

Returns whether this is a shared memory or not.

Note that shared memories are part of the threads proposal for WebAssembly which is not standardized yet.

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pub fn minimum(&self) -> u64

Returns minimum number of WebAssembly pages this memory must have.

Note that the return value, while a u64, will always fit into a u32 for 32-bit memories.

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pub fn maximum(&self) -> Option<u64>

Returns the optionally-specified maximum number of pages this memory can have.

If this returns None then the memory is not limited in size.

Note that the return value, while a u64, will always fit into a u32 for 32-bit memories.

Trait Implementations§

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impl Clone for MemoryType

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fn clone(&self) -> MemoryType

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 MemoryType

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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<MemoryType> for ExternType

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fn from(ty: MemoryType) -> ExternType

Converts to this type from the input type.
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impl Hash for MemoryType

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fn hash<__H: Hasher>(&self, state: &mut __H)

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 PartialEq for MemoryType

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fn eq(&self, other: &MemoryType) -> 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 Eq for MemoryType

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impl StructuralPartialEq for MemoryType

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<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<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<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> 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.