Struct wasm_encoder::DataSection

pub struct DataSection { /* private fields */ }

An encoder for the data section.

Data sections are only supported for modules.

Example

use wasm_encoder::{
    DataSection, Instruction, MemorySection, MemoryType,
    Module,
};

let mut memory = MemorySection::new();
memory.memory(MemoryType {
    minimum: 1,
    maximum: None,
    memory64: false,
});

let mut data = DataSection::new();
let memory_index = 0;
let offset = Instruction::I32Const(42);
let segment_data = b"hello";
data.active(memory_index, &offset, segment_data.iter().copied());

let mut module = Module::new();
module
    .section(&memory)
    .section(&data);

let wasm_bytes = module.finish();

Implementations

impl DataSection

pub fn new() -> Self

Create a new data section encoder.

pub fn len(&self) -> u32

The number of data segments in the section.

pub fn is_empty(&self) -> bool

Determines if the section is empty.

pub fn segment<D>(&mut self, segment: DataSegment<'_, D>) -> &mut Self where
    D: IntoIterator<Item = u8>,
    D::IntoIter: ExactSizeIterator, 

Define a data segment.

pub fn active<D>(
    &mut self,
    memory_index: u32,
    offset: &Instruction<'_>,
    data: D
) -> &mut Self where
    D: IntoIterator<Item = u8>,
    D::IntoIter: ExactSizeIterator, 

Define an active data segment.

pub fn passive<D>(&mut self, data: D) -> &mut Self where
    D: IntoIterator<Item = u8>,
    D::IntoIter: ExactSizeIterator, 

Define a passive data segment.

Passive data segments are part of the bulk memory proposal.

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

Copy an already-encoded data segment into this data section.

Trait Implementations

impl Clone for DataSection

fn clone(&self) -> DataSection

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DataSection

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

Formats the value using the given formatter.

impl Default for DataSection

fn default() -> DataSection

Returns the “default value” for a type.

impl Section for DataSection

fn id(&self) -> u8

Gets the section’s identifier.

fn encode<S>(&self, sink: &mut S) where
    S: Extend<u8>, 

Write this section’s header and data into the given sink.