Function libcall

cranelift/interpreter/src/interpreter.rs:956–983

()

    #[test]
    fn libcall() {
        let code = "function %test() -> i64 {
            fn0 = colocated %CeilF32 (f32) -> f32 fast
        block0:
            v1 = f32const 0x0.5
            v2 = call fn0(v1)
            return v2
        }";

        let func = parse_functions(code).unwrap().into_iter().next().unwrap();
        let mut env = FunctionStore::default();
        env.add(func.name.to_string(), &func);
        let state = InterpreterState::default()
            .with_function_store(env)
            .with_libcall_handler(|libcall, args| {
                Ok(smallvec![match (libcall, &args[..]) {
                    (LibCall::CeilF32, [DataValue::F32(a)]) => DataValue::F32(a.ceil()),
                    _ => panic!("Unexpected args"),
                }])
            });

        let result = Interpreter::new(state).call_by_name("%test", &[]).unwrap();

        assert_eq!(
            result,
            ControlFlow::Return(smallvec![DataValue::F32(Ieee32::with_float(1.0))])
        )
    }

    #[test]
    fn misaligned_store_traps() {