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

An encoder for the data section.

Data sections are only supported for modules.

Example

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

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

let mut data = DataSection::new();
let memory_index = 0;
let offset = ConstExpr::i32_const(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§

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impl DataSection

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pub fn new() -> Self

Create a new data section encoder.

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pub fn len(&self) -> u32

The number of data 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<D>(&mut self, segment: DataSegment<'_, D>) -> &mut Selfwhere D: IntoIterator<Item = u8>, D::IntoIter: ExactSizeIterator,

Define a data segment.

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pub fn active<D>( &mut self, memory_index: u32, offset: &ConstExpr, data: D ) -> &mut Selfwhere D: IntoIterator<Item = u8>, D::IntoIter: ExactSizeIterator,

Define an active data segment.

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

Define a passive data segment.

Passive data segments are part of the bulk memory proposal.

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

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

Trait Implementations§

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impl Clone for DataSection

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fn clone(&self) -> DataSection

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 DataSection

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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 DataSection

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fn default() -> DataSection

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

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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 DataSection

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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.