/src/wasm-tools/crates/wasm-encoder/src/component/start.rs
Line | Count | Source |
1 | | use crate::{ComponentSection, ComponentSectionId, Encode}; |
2 | | use 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)] |
19 | | pub 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 | | |
33 | | impl<A> Encode for ComponentStartSection<A> |
34 | | where |
35 | | A: AsRef<[u32]>, |
36 | | { |
37 | 0 | fn encode(&self, sink: &mut Vec<u8>) { |
38 | 0 | let mut bytes = Vec::new(); |
39 | 0 | self.function_index.encode(&mut bytes); |
40 | 0 | self.args.as_ref().encode(&mut bytes); |
41 | 0 | self.results.encode(&mut bytes); |
42 | 0 | bytes.encode(sink); |
43 | 0 | } |
44 | | } |
45 | | |
46 | | impl<A> ComponentSection for ComponentStartSection<A> |
47 | | where |
48 | | A: AsRef<[u32]>, |
49 | | { |
50 | 0 | fn id(&self) -> u8 { |
51 | 0 | ComponentSectionId::Start.into() |
52 | 0 | } |
53 | | } |