Struct wasmtime::MemoryType

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pub struct MemoryType { /* private fields */ }
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 64KiB by default. Use MemoryTypeBuilder if you want a non-default page size.

§Panics

Panics if the minimum is greater than the maximum or if the minimum or maximum number of pages can result in a byte size that is not addressable with a 32-bit integer.

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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 64KiB by default. Use MemoryTypeBuilder if you want a non-default page size.

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

§Panics

Panics if the minimum is greater than the maximum or if the minimum or maximum number of pages can result in a byte size that is not addressable with a 64-bit integer.

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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 64KiB by default. Use MemoryTypeBuilder if you want a non-default page size.

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

§Panics

Panics if the minimum is greater than the maximum or if the minimum or maximum number of pages can result in a byte size that is not addressable with a 32-bit integer.

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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.

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pub fn page_size(&self) -> u64

This memory’s page size, in bytes.

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pub fn page_size_log2(&self) -> u8

The log2 of this memory’s page size, in bytes.

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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<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<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> IntoEither for T

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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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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.