Struct wasm_encoder::ElementSection

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

An encoder for the element section.

Element sections are only supported for modules.

§Example

use std::borrow::Cow;
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,
    table64: false,
    shared: false,
});

let mut elements = ElementSection::new();
let table_index = 0;
let offset = ConstExpr::i32_const(42);
let functions = Elements::Functions(Cow::Borrowed(&[
    // 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§

source§

impl ElementSection

source

pub fn new() -> Self

Create a new element section encoder.

source

pub fn len(&self) -> u32

The number of element segments in the section.

source

pub fn is_empty(&self) -> bool

Determines if the section is empty.

source

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

Define an element segment.

source

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.

source

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.

source

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.

source

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

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

Trait Implementations§

source§

impl Clone for ElementSection

source§

fn clone(&self) -> ElementSection

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl Debug for ElementSection

source§

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

Formats the value using the given formatter. Read more
source§

impl Default for ElementSection

source§

fn default() -> ElementSection

Returns the “default value” for a type. Read more
source§

impl Encode for ElementSection

source§

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

Encode the type into the given byte sink.
source§

impl Section for ElementSection

source§

fn id(&self) -> u8

Gets the section identifier for this section.
source§

fn append_to(&self, dst: &mut Vec<u8>)

Appends this section to the specified destination list of bytes.

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> CloneToUninit for T
where T: Clone,

source§

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
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for T
where T: Clone,

source§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

source§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.