Function signature

cranelift/reader/src/parser.rs:3122–3173

()

    #[test]
    fn signature() {
        let sig = Parser::new("()system_v").parse_signature().unwrap();
        assert_eq!(sig.params.len(), 0);
        assert_eq!(sig.returns.len(), 0);
        assert_eq!(sig.call_conv, CallConv::SystemV);

        let sig2 =
            Parser::new("(i8 uext, f16, f32, f64, f128, i32 sret) -> i32 sext, f64 system_v")
                .parse_signature()
                .unwrap();
        assert_eq!(
            sig2.to_string(),
            "(i8 uext, f16, f32, f64, f128, i32 sret) -> i32 sext, f64 system_v"
        );
        assert_eq!(sig2.call_conv, CallConv::SystemV);

        // Old-style signature without a calling convention.
        assert_eq!(
            Parser::new("()").parse_signature().unwrap().to_string(),
            "() fast"
        );
        assert_eq!(
            Parser::new("() notacc")
                .parse_signature()
                .unwrap_err()
                .to_string(),
            "1: unknown calling convention: notacc"
        );

        // `void` is not recognized as a type by the lexer. It should not appear in files.
        assert_eq!(
            Parser::new("() -> void")
                .parse_signature()
                .unwrap_err()
                .to_string(),
            "1: expected parameter type"
        );
        assert_eq!(
            Parser::new("i8 -> i8")
                .parse_signature()
                .unwrap_err()
                .to_string(),
            "1: expected function signature: ( args... )"
        );
        assert_eq!(
            Parser::new("(i8 -> i8")
                .parse_signature()
                .unwrap_err()
                .to_string(),
            "1: expected ')' after function arguments"
        );
    }

    #[test]
    fn stack_slot_decl() {