Struct cranelift_codegen::ir::constant::ConstantData

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pub struct ConstantData(/* private fields */);
Expand description

This type describes the actual constant data. Note that the bytes stored in this structure are expected to be in little-endian order; this is due to ease-of-use when interacting with WebAssembly values, which are little-endian by design.

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impl ConstantData

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pub fn len(&self) -> usize

Return the number of bytes in the constant.

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pub fn is_empty(&self) -> bool

Check if the constant contains any bytes.

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pub fn as_slice(&self) -> &[u8]

Return the data as a slice.

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pub fn into_vec(self) -> Vec<u8>

Convert the data to a vector.

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pub fn iter(&self) -> Iter<'_, u8>

Iterate over the constant’s bytes.

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pub fn append(self, bytes: impl IntoBytes) -> Self

Add new bytes to the constant data.

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pub fn expand_to(self, expected_size: usize) -> Self

Expand the size of the constant data to expected_size number of bytes by adding zeroes in the high-order byte slots.

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impl Clone for ConstantData

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fn clone(&self) -> ConstantData

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 ConstantData

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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 Default for ConstantData

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fn default() -> ConstantData

Returns the “default value” for a type. Read more
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impl Display for ConstantData

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Print the constant data in hexadecimal format, e.g. 0x000102030405060708090a0b0c0d0e0f. This function will flip the stored order of bytes–little-endian–to the more readable big-endian ordering.

use cranelift_codegen::ir::ConstantData;
let data = ConstantData::from([3, 2, 1, 0, 0].as_ref()); // note the little-endian order
assert_eq!(data.to_string(), "0x0000010203");
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impl From<&[u8]> for ConstantData

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fn from(v: &[u8]) -> Self

Converts to this type from the input type.
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impl From<V128Imm> for ConstantData

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fn from(v: V128Imm) -> Self

Converts to this type from the input type.
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impl From<Vec<u8>> for ConstantData

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fn from(v: Vec<u8>) -> Self

Converts to this type from the input type.
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impl FromIterator<u8> for ConstantData

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fn from_iter<T: IntoIterator<Item = u8>>(iter: T) -> Self

Creates a value from an iterator. Read more
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impl FromStr for ConstantData

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fn from_str(s: &str) -> Result<Self, &'static str>

Parse a hexadecimal string to ConstantData. This is the inverse of Display::fmt.

use cranelift_codegen::ir::ConstantData;
let c: ConstantData = "0x000102".parse().unwrap();
assert_eq!(c.into_vec(), [2, 1, 0]);
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type Err = &'static str

The associated error which can be returned from parsing.
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impl Hash for ConstantData

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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 Ord for ConstantData

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fn cmp(&self, other: &ConstantData) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for ConstantData

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fn eq(&self, other: &ConstantData) -> 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 PartialOrd for ConstantData

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fn partial_cmp(&self, other: &ConstantData) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Eq for ConstantData

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impl StructuralPartialEq for ConstantData

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> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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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> 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.