std: Add init and uninit to mem. Replace direct intrinsic usage

Author: brson

src/doc/guide-ffi.md

@@ -176,6 +176,7 @@ and `free`:
 ~~~~
 use std::cast;
 use std::libc::{c_void, size_t, malloc, free};
+use std::mem;
 use std::ptr;
 use std::unstable::intrinsics;
 
@@ -226,7 +227,7 @@ impl<T: Send> Unique<T> {
 impl<T: Send> Drop for Unique<T> {
     fn drop(&mut self) {
         unsafe {
-            let x = intrinsics::uninit(); // dummy value to swap in
+            let x = mem::uninit(); // dummy value to swap in
             // We need to move the object out of the box, so that
             // the destructor is called (at the end of this scope.)
             ptr::replace_ptr(self.ptr, x);

src/libnative/io/file.rs

@@ -16,9 +16,9 @@ use std::io::IoError;
 use std::io;
 use std::libc::{c_int, c_void};
 use std::libc;
+use std::mem;
 use std::os;
 use std::rt::rtio;
-use std::unstable::intrinsics;
 use std::vec;
 
 use io::{IoResult, retry};
@@ -147,7 +147,7 @@ impl rtio::RtioFileStream for FileDesc {
         #[cfg(windows)]
         fn os_pread(fd: c_int, buf: *u8, amt: uint, offset: u64) -> IoResult<int> {
             unsafe {
-                let mut overlap: libc::OVERLAPPED = intrinsics::init();
+                let mut overlap: libc::OVERLAPPED = mem::init();
                 let handle = libc::get_osfhandle(fd) as libc::HANDLE;
                 let mut bytes_read = 0;
                 overlap.Offset = offset as libc::DWORD;
@@ -179,7 +179,7 @@ impl rtio::RtioFileStream for FileDesc {
         #[cfg(windows)]
         fn os_pwrite(fd: c_int, buf: *u8, amt: uint, offset: u64) -> IoResult<()> {
             unsafe {
-                let mut overlap: libc::OVERLAPPED = intrinsics::init();
+                let mut overlap: libc::OVERLAPPED = mem::init();
                 let handle = libc::get_osfhandle(fd) as libc::HANDLE;
                 overlap.Offset = offset as libc::DWORD;
                 overlap.OffsetHigh = (offset >> 32) as libc::DWORD;
@@ -867,7 +867,7 @@ pub fn stat(p: &CString) -> IoResult<io::FileStat> {
 
     #[cfg(windows)]
     fn os_stat(p: &CString) -> IoResult<io::FileStat> {
-        let mut stat: libc::stat = unsafe { intrinsics::uninit() };
+        let mut stat: libc::stat = unsafe { mem::uninit() };
         as_utf16_p(p.as_str().unwrap(), |up| {
             match retry(|| unsafe { libc::wstat(up, &mut stat) }) {
                 0 => Ok(mkstat(&stat, p)),
@@ -878,7 +878,7 @@ pub fn stat(p: &CString) -> IoResult<io::FileStat> {
 
     #[cfg(unix)]
     fn os_stat(p: &CString) -> IoResult<io::FileStat> {
-        let mut stat: libc::stat = unsafe { intrinsics::uninit() };
+        let mut stat: libc::stat = unsafe { mem::uninit() };
         match retry(|| unsafe { libc::stat(p.with_ref(|p| p), &mut stat) }) {
             0 => Ok(mkstat(&stat, p)),
             _ => Err(super::last_error()),
@@ -897,7 +897,7 @@ pub fn lstat(p: &CString) -> IoResult<io::FileStat> {
 
     #[cfg(unix)]
     fn os_lstat(p: &CString) -> IoResult<io::FileStat> {
-        let mut stat: libc::stat = unsafe { intrinsics::uninit() };
+        let mut stat: libc::stat = unsafe { mem::uninit() };
         match retry(|| unsafe { libc::lstat(p.with_ref(|p| p), &mut stat) }) {
             0 => Ok(mkstat(&stat, p)),
             _ => Err(super::last_error()),

src/libnative/io/net.rs

@@ -68,7 +68,7 @@ fn ip_to_inaddr(ip: ip::IpAddr) -> InAddr {
 
 fn addr_to_sockaddr(addr: ip::SocketAddr) -> (libc::sockaddr_storage, uint) {
     unsafe {
-        let storage: libc::sockaddr_storage = intrinsics::init();
+        let storage: libc::sockaddr_storage = mem::init();
         let len = match ip_to_inaddr(addr.ip) {
             InAddr(inaddr) => {
                 let storage: *mut libc::sockaddr_in = cast::transmute(&storage);
@@ -138,7 +138,7 @@ fn sockname(fd: sock_t,
                                          *mut libc::socklen_t) -> libc::c_int)
     -> IoResult<ip::SocketAddr>
 {
-    let mut storage: libc::sockaddr_storage = unsafe { intrinsics::init() };
+    let mut storage: libc::sockaddr_storage = unsafe { mem::init() };
     let mut len = mem::size_of::<libc::sockaddr_storage>() as libc::socklen_t;
     unsafe {
         let storage = &mut storage as *mut libc::sockaddr_storage;
@@ -225,7 +225,7 @@ pub fn init() {
 
         LOCK.lock();
         if !INITIALIZED {
-            let mut data: WSADATA = intrinsics::init();
+            let mut data: WSADATA = mem::init();
             let ret = WSAStartup(0x202,      // version 2.2
                                  &mut data);
             assert_eq!(ret, 0);
@@ -438,7 +438,7 @@ impl TcpAcceptor {
 
     pub fn native_accept(&mut self) -> IoResult<TcpStream> {
         unsafe {
-            let mut storage: libc::sockaddr_storage = intrinsics::init();
+            let mut storage: libc::sockaddr_storage = mem::init();
             let storagep = &mut storage as *mut libc::sockaddr_storage;
             let size = mem::size_of::<libc::sockaddr_storage>();
             let mut size = size as libc::socklen_t;
@@ -543,7 +543,7 @@ impl rtio::RtioSocket for UdpSocket {
 impl rtio::RtioUdpSocket for UdpSocket {
     fn recvfrom(&mut self, buf: &mut [u8]) -> IoResult<(uint, ip::SocketAddr)> {
         unsafe {
-            let mut storage: libc::sockaddr_storage = intrinsics::init();
+            let mut storage: libc::sockaddr_storage = mem::init();
             let storagep = &mut storage as *mut libc::sockaddr_storage;
             let mut addrlen: libc::socklen_t =
                     mem::size_of::<libc::sockaddr_storage>() as libc::socklen_t;

src/libnative/io/timer_other.rs

@@ -49,11 +49,11 @@
 use std::comm::Data;
 use std::hashmap::HashMap;
 use std::libc;
+use std::mem;
 use std::os;
 use std::ptr;
 use std::rt::rtio;
 use std::sync::atomics;
-use std::unstable::intrinsics;
 
 use io::file::FileDesc;
 use io::IoResult;
@@ -87,17 +87,17 @@ pub enum Req {
 // returns the current time (in milliseconds)
 fn now() -> u64 {
     unsafe {
-        let mut now: libc::timeval = intrinsics::init();
+        let mut now: libc::timeval = mem::init();
         assert_eq!(imp::gettimeofday(&mut now, ptr::null()), 0);
         return (now.tv_sec as u64) * 1000 + (now.tv_usec as u64) / 1000;
     }
 }
 
 fn helper(input: libc::c_int, messages: Port<Req>) {
-    let mut set: imp::fd_set = unsafe { intrinsics::init() };
+    let mut set: imp::fd_set = unsafe { mem::init() };
 
     let mut fd = FileDesc::new(input, true);
-    let mut timeout: libc::timeval = unsafe { intrinsics::init() };
+    let mut timeout: libc::timeval = unsafe { mem::init() };
 
     // active timers are those which are able to be selected upon (and it's a
     // sorted list, and dead timers are those which have expired, but ownership

src/libnative/io/timer_timerfd.rs

@@ -34,7 +34,7 @@ use std::ptr;
 use std::os;
 use std::rt::rtio;
 use std::hashmap::HashMap;
-use std::unstable::intrinsics;
+use std::mem;
 
 use io::file::FileDesc;
 use io::IoResult;
@@ -75,7 +75,7 @@ fn helper(input: libc::c_int, messages: Port<Req>) {
     }
 
     add(efd, input);
-    let events: [imp::epoll_event, ..16] = unsafe { intrinsics::init() };
+    let events: [imp::epoll_event, ..16] = unsafe { mem::init() };
     let mut map: HashMap<libc::c_int, (Chan<()>, bool)> = HashMap::new();
     'outer: loop {
         let n = match unsafe {

src/librustdoc/html/markdown.rs

@@ -28,6 +28,7 @@ use std::cast;
 use std::fmt;
 use std::io;
 use std::libc;
+use std::mem;
 use std::str;
 use std::unstable::intrinsics;
 use std::vec;
@@ -144,7 +145,7 @@ pub fn render(w: &mut io::Writer, s: &str) -> fmt::Result {
             flags: 0,
             link_attributes: None,
         };
-        let mut callbacks: sd_callbacks = intrinsics::init();
+        let mut callbacks: sd_callbacks = mem::init();
 
         sdhtml_renderer(&callbacks, &options, 0);
         let opaque = my_opaque {
@@ -197,7 +198,7 @@ pub fn find_testable_code(doc: &str, tests: &mut ::test::Collector) {
                          MKDEXT_STRIKETHROUGH;
         let callbacks = sd_callbacks {
             blockcode: block,
-            other: intrinsics::init()
+            other: mem::init()
         };
 
         let tests = tests as *mut ::test::Collector as *libc::c_void;

src/librustuv/net.rs

@@ -80,7 +80,7 @@ pub fn sockaddr_to_addr(storage: &libc::sockaddr_storage,
 
 fn addr_to_sockaddr(addr: ip::SocketAddr) -> (libc::sockaddr_storage, uint) {
     unsafe {
-        let mut storage: libc::sockaddr_storage = intrinsics::init();
+        let mut storage: libc::sockaddr_storage = mem::init();
         let len = match addr.ip {
             ip::Ipv4Addr(a, b, c, d) => {
                 let storage: &mut libc::sockaddr_in =
@@ -134,7 +134,7 @@ fn socket_name(sk: SocketNameKind,
     };
 
     // Allocate a sockaddr_storage since we don't know if it's ipv4 or ipv6
-    let mut sockaddr: libc::sockaddr_storage = unsafe { intrinsics::init() };
+    let mut sockaddr: libc::sockaddr_storage = unsafe { mem::init() };
     let mut namelen = mem::size_of::<libc::sockaddr_storage>() as c_int;
 
     let sockaddr_p = &mut sockaddr as *mut libc::sockaddr_storage;

src/libstd/c_str.rs

@@ -70,14 +70,14 @@ use kinds::marker;
 use ops::Drop;
 use cmp::Eq;
 use clone::Clone;
+use mem;
 use option::{Option, Some, None};
 use ptr::RawPtr;
 use ptr;
 use str::StrSlice;
 use str;
 use vec::{ImmutableVector, MutableVector};
 use vec;
-use unstable::intrinsics;
 use rt::global_heap::malloc_raw;
 
 /// The representation of a C String.
@@ -327,7 +327,7 @@ impl<'a> ToCStr for &'a [u8] {
 // Unsafe function that handles possibly copying the &[u8] into a stack array.
 unsafe fn with_c_str<T>(v: &[u8], checked: bool, f: |*libc::c_char| -> T) -> T {
     if v.len() < BUF_LEN {
-        let mut buf: [u8, .. BUF_LEN] = intrinsics::uninit();
+        let mut buf: [u8, .. BUF_LEN] = mem::uninit();
         vec::bytes::copy_memory(buf, v);
         buf[v.len()] = 0;
 

src/libstd/cast.rs

@@ -18,7 +18,7 @@ use ptr::copy_nonoverlapping_memory;
 /// Casts the value at `src` to U. The two types must have the same length.
 #[inline]
 pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
-    let mut dest: U = intrinsics::uninit();
+    let mut dest: U = mem::uninit();
     let dest_ptr: *mut u8 = transmute(&mut dest);
     let src_ptr: *u8 = transmute(src);
     copy_nonoverlapping_memory(dest_ptr, src_ptr, mem::size_of::<U>());

src/libstd/mem.rs

@@ -68,6 +68,21 @@ pub fn pref_align_of_val<T>(_val: &T) -> uint {
     pref_align_of::<T>()
 }
 
+/// Create a value initialized to zero.
+///
+/// `init` is unsafe because it returns a zeroed-out datum,
+/// which is unsafe unless T is Pod.
+#[inline]
+pub unsafe fn init<T>() -> T {
+    intrinsics::init()
+}
+
+/// Create an uninitialized value.
+#[inline]
+pub unsafe fn uninit<T>() -> T {
+    intrinsics::uninit()
+}
+
 #[cfg(test)]
 mod tests {
     use mem::*;