Enum wasmtime::ValType

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pub enum ValType {
    I32,
    I64,
    F32,
    F64,
    V128,
    Ref(RefType),
}
Expand description

A list of all possible value types in WebAssembly.

§Subtyping and Equality

ValType does not implement Eq, because reference types have a subtyping relationship, and so 99.99% of the time you actually want to check whether one type matches (i.e. is a subtype of) another type. You can use the ValType::matches and Val::matches_ty methods to perform these types of checks. If, however, you are in that 0.01% scenario where you need to check precise equality between types, you can use the ValType::eq method.

Variants§

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I32

Signed 32 bit integer.

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I64

Signed 64 bit integer.

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F32

Floating point 32 bit integer.

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F64

Floating point 64 bit integer.

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V128

A 128 bit number.

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Ref(RefType)

An opaque reference to some type on the heap.

Implementations§

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impl ValType

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pub const EXTERNREF: Self = _

The externref type, aka (ref null extern).

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pub const NULLEXTERNREF: Self = _

The nullexternref type, aka (ref null noextern).

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pub const FUNCREF: Self = _

The funcref type, aka (ref null func).

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pub const NULLFUNCREF: Self = _

The nullfuncref type, aka (ref null nofunc).

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pub const ANYREF: Self = _

The anyref type, aka (ref null any).

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pub const I31REF: Self = _

The i31ref type, aka (ref null i31).

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pub const ARRAYREF: Self = _

The arrayref type, aka (ref null array).

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pub const STRUCTREF: Self = _

The structref type, aka (ref null struct).

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pub const NULLREF: Self = _

The nullref type, aka (ref null none).

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pub fn is_num(&self) -> bool

Returns true if ValType matches any of the numeric types. (e.g. I32, I64, F32, F64).

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pub fn is_i32(&self) -> bool

Is this the i32 type?

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pub fn is_i64(&self) -> bool

Is this the i64 type?

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pub fn is_f32(&self) -> bool

Is this the f32 type?

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pub fn is_f64(&self) -> bool

Is this the f64 type?

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pub fn is_v128(&self) -> bool

Is this the v128 type?

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pub fn is_ref(&self) -> bool

Returns true if ValType is any kind of reference type.

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pub fn is_funcref(&self) -> bool

Is this the funcref (aka (ref null func)) type?

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pub fn is_externref(&self) -> bool

Is this the externref (aka (ref null extern)) type?

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pub fn is_anyref(&self) -> bool

Is this the anyref (aka (ref null any)) type?

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pub fn as_ref(&self) -> Option<&RefType>

Get the underlying reference type, if this value type is a reference type.

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pub fn unwrap_ref(&self) -> &RefType

Get the underlying reference type, panicking if this value type is not a reference type.

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pub fn matches(&self, other: &ValType) -> bool

Does this value type match the other type?

That is, is this value type a subtype of the other?

§Panics

Panics if either type is associated with a different engine from the other.

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pub fn eq(a: &Self, b: &Self) -> bool

Is value type a precisely equal to value type b?

Returns false even if a is a subtype of b or vice versa, if they are not exactly the same value type.

§Panics

Panics if either type is associated with a different engine.

Trait Implementations§

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impl Clone for ValType

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fn clone(&self) -> ValType

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 ValType

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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 Display for ValType

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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<RefType> for ValType

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fn from(r: RefType) -> Self

Converts to this type from the input type.
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impl From<ValType> for StorageType

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fn from(v: ValType) -> Self

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

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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

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> 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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. 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.