You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: emu.rs
    path of file: ./repos/LibAFL/libafl_qemu/src
    
    the code of the file until where you have to start completion: //! Expose QEMU user `LibAFL` C api to Rust

use core::{
    ffi::c_void,
    fmt,
    mem::{transmute, MaybeUninit},
    ptr::{addr_of, copy_nonoverlapping, null},
};
#[cfg(emulation_mode = "usermode")]
use std::cell::OnceCell;
#[cfg(emulation_mode = "systemmode")]
use std::{ffi::CStr, ptr::null_mut};
use std::{ffi::CString, ptr, slice::from_raw_parts, str::from_utf8_unchecked};

#[cfg(emulation_mo
    
    pub fn get_phys_addr(&self, vaddr: GuestAddr) -> Option<GuestPhysAddr> {
        unsafe {
            let page = libafl_page_from_addr(vaddr);
            let mut attrs = MaybeUninit::<libafl_qemu_sys::MemTxAttrs>::uninit();
            let paddr = libafl_qemu_sys::cpu_get_phys_page_attrs_debug(
                self.ptr,
                page as GuestVirtAddr,
                attrs.as_mut_ptr(),
            );
            if paddr == (-1i64 as GuestPhysAddr) {
                None
            } else {
                Some(paddr)
            }
        }
    }