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use crate::{ComponentSection, ComponentSectionId, Encode};
/// An encoder for the start section of WebAssembly components.
///
/// # Example
///
/// ```
/// use wasm_encoder::{Component, ComponentStartSection};
///
/// let start = ComponentStartSection { function_index: 0, args: [0, 1], results: 1 };
///
/// let mut component = Component::new();
/// component.section(&start);
///
/// let bytes = component.finish();
/// ```
#[derive(Clone, Debug)]
pub struct ComponentStartSection<A> {
/// The index to the start function.
pub function_index: u32,
/// The arguments to pass to the start function.
///
/// An argument is an index to a value.
pub args: A,
/// The number of expected results for the start function.
///
/// This should match the number of results for the type of
/// the function referenced by `function_index`.
pub results: u32,
}
impl<A> Encode for ComponentStartSection<A>
where
A: AsRef<[u32]>,
{
fn encode(&self, sink: &mut Vec<u8>) {
let mut bytes = Vec::new();
self.function_index.encode(&mut bytes);
self.args.as_ref().encode(&mut bytes);
self.results.encode(&mut bytes);
bytes.encode(sink);
}
}
impl<A> ComponentSection for ComponentStartSection<A>
where
A: AsRef<[u32]>,
{
fn id(&self) -> u8 {
ComponentSectionId::Start.into()
}
}
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