Remove all uses of mem::uninitialized for Rust 1.38

lib/emscripten/src/env/unix/mod.rs

@@ -196,18 +196,15 @@ pub fn _getaddrinfo(
 
     let hints = hints_ptr.deref(memory).map(|hints_memory| {
         let hints_guest = hints_memory.get();
-        unsafe {
-            let mut hints_native: addrinfo = std::mem::uninitialized();
-            hints_native.ai_flags = hints_guest.ai_flags;
-            hints_native.ai_family = hints_guest.ai_family;
-            hints_native.ai_socktype = hints_guest.ai_socktype;
-            hints_native.ai_protocol = hints_guest.ai_protocol;
-            hints_native.ai_addrlen = 0;
-            hints_native.ai_addr = std::ptr::null_mut();
-            hints_native.ai_canonname = std::ptr::null_mut();
-            hints_native.ai_next = std::ptr::null_mut();
-
-            hints_native
+        addrinfo {
+            ai_flags: hints_guest.ai_flags,
+            ai_family: hints_guest.ai_family,
+            ai_socktype: hints_guest.ai_socktype,
+            ai_protocol: hints_guest.ai_protocol,
+            ai_addrlen: 0,
+            ai_addr: std::ptr::null_mut(),
+            ai_canonname: std::ptr::null_mut(),
+            ai_next: std::ptr::null_mut(),
         }
     });
 

lib/emscripten/src/memory.rs

@@ -71,7 +71,7 @@ pub fn sbrk(ctx: &mut Ctx, increment: i32) -> i32 {
     debug!("emscripten::sbrk");
     // let old_dynamic_top = 0;
     // let new_dynamic_top = 0;
-    let mut globals = get_emscripten_data(ctx).globals;
+    let globals = get_emscripten_data(ctx).globals;
     let dynamictop_ptr = (globals.dynamictop_ptr) as usize;
     let old_dynamic_top = ctx.memory(0).view::<u32>()[dynamictop_ptr].get() as i32;
     let new_dynamic_top: i32 = old_dynamic_top + increment;

lib/emscripten/src/syscalls/unix.rs

@@ -617,13 +617,13 @@ pub fn ___syscall102(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_in
                 unsafe { address_len.deref_mut(ctx.memory(0)).unwrap().get_mut() };
             // let mut address_len_addr: socklen_t = 0;
 
-            let (fd, host_address) = unsafe {
-                let mut host_address: sockaddr = std::mem::uninitialized();
-                let fd = accept(socket, &mut host_address, address_len_addr);
-
-                (fd, host_address)
+            let mut host_address: sockaddr = sockaddr {
+                sa_family: Default::default(),
+                sa_data: Default::default(),
+                #[cfg(target_os = "macos")]
+                sa_len: Default::default(),
             };
-
+            let fd = unsafe { accept(socket, &mut host_address, address_len_addr) };
             let address_addr = unsafe { address.deref_mut(ctx.memory(0)).unwrap().get_mut() };
 
             address_addr.sa_family = host_address.sa_family as _;
@@ -651,15 +651,18 @@ pub fn ___syscall102(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_in
             let address_len_addr =
                 unsafe { address_len.deref_mut(ctx.memory(0)).unwrap().get_mut() };
 
-            let (ret, sock_addr_host) = unsafe {
-                // read host data into new var
-                let mut address: sockaddr = std::mem::uninitialized();
-                let ret = getsockname(
+            let mut sock_addr_host: sockaddr = sockaddr {
+                sa_family: Default::default(),
+                sa_data: Default::default(),
+                #[cfg(target_os = "macos")]
+                sa_len: Default::default(),
+            };
+            let ret = unsafe {
+                getsockname(
                     socket,
-                    &mut address as *mut sockaddr,
+                    &mut sock_addr_host as *mut sockaddr,
                     address_len_addr as *mut u32,
-                );
-                (ret, address)
+                )
             };
             // translate from host data into emscripten data
             let mut address_mut = unsafe { address.deref_mut(ctx.memory(0)).unwrap().get_mut() };

lib/kernel-net/src/lib.rs

@@ -219,7 +219,7 @@ fn __get_async_io_payload<
 }
 
 #[repr(C)]
-#[derive(Copy, Clone)]
+#[derive(Default, Copy, Clone)]
 struct SockaddrIn {
     sin_family: u16, // e.g. AF_INET
     sin_port: u16,   // e.g. htons(3490)
@@ -315,7 +315,7 @@ impl Tcp4Listener {
             self.fd,
             EpollDirection::In,
             move |fd| -> Result<Arc<TcpStream>, i32> {
-                let mut incoming_sa: SockaddrIn = unsafe { ::std::mem::uninitialized() };
+                let mut incoming_sa: SockaddrIn = SockaddrIn::default();
                 let mut real_len: usize = ::std::mem::size_of::<SockaddrIn>();
                 let conn = unsafe { _accept4(fd, &mut incoming_sa, &mut real_len, O_NONBLOCK) };
                 if conn >= 0 {

lib/runtime-core/src/structures/mono_vec.rs

@@ -1,4 +1,3 @@
-
 #[derive(Debug, Clone)]
 enum MonoVecInner<T> {
     None,
@@ -36,7 +35,7 @@ impl<T> MonoVec<T> {
     }
 
     pub fn push(&mut self, item: T) {
-        let uninit = unsafe { mem::uninitialized() };
+        let uninit = MonoVecInner::None;
         let prev = mem::replace(&mut self.inner, uninit);
         let next = match prev {
             MonoVecInner::None => MonoVecInner::Inline(item),
@@ -54,7 +53,7 @@ impl<T> MonoVec<T> {
         match self.inner {
             MonoVecInner::None => None,
             MonoVecInner::Inline(ref mut item) => {
-                let uninit = unsafe { mem::uninitialized() };
+                let uninit = unsafe { mem::zeroed() };
                 let item = mem::replace(item, uninit);
                 let uninit = mem::replace(&mut self.inner, MonoVecInner::None);
                 mem::forget(uninit);

lib/wasi/src/syscalls/unix/mod.rs

@@ -19,7 +19,10 @@ pub fn platform_clock_res_get(
     };
 
     let (output, timespec_out) = unsafe {
-        let mut timespec_out: timespec = mem::uninitialized();
+        let mut timespec_out: timespec = timespec {
+            tv_sec: 0,
+            tv_nsec: 0,
+        };
         (clock_getres(unix_clock_id, &mut timespec_out), timespec_out)
     };
 
@@ -44,7 +47,10 @@ pub fn platform_clock_time_get(
     };
 
     let (output, timespec_out) = unsafe {
-        let mut timespec_out: timespec = mem::uninitialized();
+        let mut timespec_out: timespec = timespec {
+            tv_sec: 0,
+            tv_nsec: 0,
+        };
         (
             clock_gettime(unix_clock_id, &mut timespec_out),
             timespec_out,