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use crate::limits::{MAX_WASM_FUNCTION_RETURNS, MAX_WASM_START_ARGS};
use crate::prelude::*;
use crate::{BinaryReader, FromReader, Result};
/// Represents the start function in a WebAssembly component.
#[derive(Debug, Clone)]
pub struct ComponentStartFunction {
/// The index to the start function.
pub func_index: u32,
/// The start function arguments.
///
/// The arguments are specified by value index.
pub arguments: Box<[u32]>,
/// The number of expected results for the start function.
pub results: u32,
}
impl<'a> FromReader<'a> for ComponentStartFunction {
fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
let func_index = reader.read_var_u32()?;
let arguments = reader
.read_iter(MAX_WASM_START_ARGS, "start function arguments")?
.collect::<Result<_>>()?;
let results = reader.read_size(MAX_WASM_FUNCTION_RETURNS, "start function results")? as u32;
Ok(ComponentStartFunction {
func_index,
arguments,
results,
})
}
}