find

    fn find(symbols: []const Symbol, address: usize) ?*const Symbol {
        if (symbols.len == 0) return null; // no potential match
        if (address < symbols[0].addr) return null; // address is before the lowest-address symbol
        var left: usize = 0;
        var len: usize = symbols.len;
        while (len > 1) {
            const mid = left + len / 2;
            if (address < symbols[mid].addr) {
                len /= 2;
            } else {
                left = mid;
                len -= len / 2;
            }
        }
        return &symbols[left];
    }