Function create_ctx

src/wasm2c_frontend.rs:33–83

(
    memptr: *mut u8,
    homedir: &str,
    mut arg_buffer: Vec<u8>,
    argc: usize,
    mut env_buffer: Vec<u8>,
    envc: usize,
    netlist: Netlist,
)

trace::init_depth_var!();

pub fn create_ctx(
    memptr: *mut u8,
    homedir: &str,
    mut arg_buffer: Vec<u8>,
    argc: usize,
    mut env_buffer: Vec<u8>,
    envc: usize,
    netlist: Netlist,
) -> VmCtx {
    let memlen = LINEAR_MEM_SIZE;
    let mut fdmap = FdMap::new();
    fdmap.init_std_fds();
    let homedir_file = std::fs::File::open(homedir).unwrap();
    let homedir_host_fd = homedir_file.as_raw_fd() as usize;
    if homedir_host_fd >= 0 {
        fdmap.create(HostFd::from_raw(homedir_host_fd));
    }
    // Need to forget file to make sure it does not get auto-closed
    // when it gets out of scope
    std::mem::forget(homedir_file);
    // replace all space with null.
    // This makes it easy to return the arg_buffer later
    for i in 0..arg_buffer.len() {
        if arg_buffer[i] == b' ' {
            arg_buffer[i] = b'\0';
        }
    }

    // replace all space with null.
    // This makes it easy to return the env_buffer later
    for i in 0..env_buffer.len() {
        if env_buffer[i] == b' ' {
            env_buffer[i] = b'\0';
        }
    }

    let mem = ffi_load_vec(memptr, memlen);

    VmCtx {
        mem,
        memlen,
        fdmap,
        homedir: homedir.to_owned(),
        homedir_host_fd: HostFd::from_raw(homedir_host_fd),
        arg_buffer,
        argc,
        env_buffer,
        envc,
        netlist,
    }
}

/// Used for FFI. (wasm2c frontend)
/// Initialize a vmctx with a memory that points to memptr