Method optional_offset_imm64

cranelift/reader/src/parser.rs:830–841

Match and consume an optional offset32 immediate. Note that this will match an empty string as an empty offset, and that if an offset is present, it must contain a sign.

(&mut self)

    // Note that this will match an empty string as an empty offset, and that if an offset is
    // present, it must contain a sign.
    fn optional_offset_imm64(&mut self) -> ParseResult<Imm64> {
        if let Some(Token::Integer(text)) = self.token() {
            if text.starts_with('+') || text.starts_with('-') {
                self.consume();
                // Lexer just gives us raw text that looks like an integer.
                // Parse it as an `Offset32` to check for overflow and other issues.
                return text.parse().map_err(|e| self.error(e));
            }
        }
        // If no explicit offset is present, the offset is 0.
        Ok(Imm64::new(0))
    }

    // Match and consume an Ieee16 immediate.
    fn match_ieee16(&mut self, err_msg: &str) -> ParseResult<Ieee16> {