wasm_encoder/component/
start.rs

1use crate::{ComponentSection, ComponentSectionId, Encode};
2use alloc::vec::Vec;
3
4/// An encoder for the start section of WebAssembly components.
5///
6/// # Example
7///
8/// ```
9/// use wasm_encoder::{Component, ComponentStartSection};
10///
11/// let start = ComponentStartSection { function_index: 0, args: [0, 1], results: 1 };
12///
13/// let mut component = Component::new();
14/// component.section(&start);
15///
16/// let bytes = component.finish();
17/// ```
18#[derive(Clone, Debug)]
19pub struct ComponentStartSection<A> {
20    /// The index to the start function.
21    pub function_index: u32,
22    /// The arguments to pass to the start function.
23    ///
24    /// An argument is an index to a value.
25    pub args: A,
26    /// The number of expected results for the start function.
27    ///
28    /// This should match the number of results for the type of
29    /// the function referenced by `function_index`.
30    pub results: u32,
31}
32
33impl<A> Encode for ComponentStartSection<A>
34where
35    A: AsRef<[u32]>,
36{
37    fn encode(&self, sink: &mut Vec<u8>) {
38        let mut bytes = Vec::new();
39        self.function_index.encode(&mut bytes);
40        self.args.as_ref().encode(&mut bytes);
41        self.results.encode(&mut bytes);
42        bytes.encode(sink);
43    }
44}
45
46impl<A> ComponentSection for ComponentStartSection<A>
47where
48    A: AsRef<[u32]>,
49{
50    fn id(&self) -> u8 {
51        ComponentSectionId::Start.into()
52    }
53}
wasm_encoder/component/start.rs

wasm_encoder/component/
start.rs
