INNER CODE UNIT · Rust

allocate_guest_memory

lunatic-solutions/lunatic · crates/lunatic-common-api/src/lib.rs:18

pub fn allocate_guest_memory<'a, T: Send>(
    caller: &'a mut Caller<T>,
    size: u32,
) -> Pin<Box<dyn Future<Output = Result<u32>> + Send + 'a>> {
    Box::pin(async move {
        let mut results = [Val::I32(0)];
        caller
            .get_export(ALLOCATOR_FUNCTION_NAME)
            .or_trap(format!("no export named {ALLOCATOR_FUNCTION_NAME} found"))?
            .into_func()
            .or_trap("cannot turn export into func")?
            .call_async(caller, &[Val::I32(size as i32)], &mut results)
            .await
            .or_trap(format!("failed to call {ALLOCATOR_FUNCTION_NAME}"))?;

        Ok(results[0]
            .i32()
            .or_trap(format!("result of {ALLOCATOR_FUNCTION_NAME} is not i32"))? as u32)

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