Method match_uimm128

cranelift/reader/src/parser.rs:720–741

Match and consume either a hexadecimal Uimm128 immediate (e.g. 0x000102...) or its literal list form (e.g. [0 1 2...]). For convenience, since uimm128 values are stored in the `ConstantPool`, this returns `ConstantData`.

(&mut self, controlling_type: Type)

    // list form (e.g. [0 1 2...]). For convenience, since uimm128 values are stored in the
    // `ConstantPool`, this returns `ConstantData`.
    fn match_uimm128(&mut self, controlling_type: Type) -> ParseResult<ConstantData> {
        let expected_size = controlling_type.bytes() as usize;
        let constant_data = if self.optional(Token::LBracket) {
            // parse using a list of values, e.g. vconst.i32x4 [0 1 2 3]
            let uimm128 = self.parse_literals_to_constant_data(controlling_type)?;
            self.match_token(Token::RBracket, "expected a terminating right bracket")?;
            uimm128
        } else {
            // parse using a hexadecimal value, e.g. 0x000102...
            let uimm128 =
                self.match_hexadecimal_constant("expected an immediate hexadecimal operand")?;
            uimm128.expand_to(expected_size)
        };

        if constant_data.len() == expected_size {
            Ok(constant_data)
        } else {
            Err(self.error(&format!(
                "expected parsed constant to have {expected_size} bytes"
            )))
        }
    }

    // Match and consume a Uimm64 immediate.
    fn match_uimm64(&mut self, err_msg: &str) -> ParseResult<Uimm64> {