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

An encoder for the element section.

Element sections are only supported for modules.

Example

use wasm_encoder::{
    Elements, ElementSection, Module, TableSection, TableType,
    RefType, ConstExpr
};

let mut tables = TableSection::new();
tables.table(TableType {
    element_type: RefType::FUNCREF,
    minimum: 128,
    maximum: None,
});

let mut elements = ElementSection::new();
let table_index = 0;
let offset = ConstExpr::i32_const(42);
let functions = Elements::Functions(&[
    // Function indices...
]);
elements.active(Some(table_index), &offset, functions);

let mut module = Module::new();
module
    .section(&tables)
    .section(&elements);

let wasm_bytes = module.finish();

Implementations§

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impl ElementSection

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pub fn new() -> Self

Create a new element section encoder.

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pub fn len(&self) -> u32

The number of element segments in the section.

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pub fn is_empty(&self) -> bool

Determines if the section is empty.

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pub fn segment<'a>(&mut self, segment: ElementSegment<'a>) -> &mut Self

Define an element segment.

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pub fn active( &mut self, table_index: Option<u32>, offset: &ConstExpr, elements: Elements<'_> ) -> &mut Self

Define an active element segment.

Active element specifying a None table forces the MVP encoding and refers to the 0th table holding funcrefs. Non-None tables use the encoding introduced with the bulk memory proposal and can refer to tables with any valid reference type.

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pub fn passive<'a>(&mut self, elements: Elements<'a>) -> &mut Self

Encode a passive element segment.

Passive segments are part of the bulk memory proposal.

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pub fn declared<'a>(&mut self, elements: Elements<'a>) -> &mut Self

Encode a declared element segment.

Declared segments are part of the bulk memory proposal.

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pub fn raw(&mut self, raw_bytes: &[u8]) -> &mut Self

Copy a raw, already-encoded element segment into this elements section.

Trait Implementations§

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impl Clone for ElementSection

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fn clone(&self) -> ElementSection

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 ElementSection

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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 ElementSection

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fn default() -> ElementSection

Returns the “default value” for a type. Read more
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impl Encode for ElementSection

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fn encode(&self, sink: &mut Vec<u8>)

Encode the type into the given byte sink.
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impl Section for ElementSection

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fn id(&self) -> u8

Gets the section identifier for this section.
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fn append_to(&self, dst: &mut Vec<u8>)

Appends this section to the specified destination list of bytes.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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> 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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.