std: Remove #[allow] directives in sys modules

These were suppressing lots of interesting warnings! Turns out there was also
quite a bit of dead code.

Author: alexcrichton

Diff for: src/libstd/lib.rs

@@ -273,13 +273,14 @@ pub mod collections;
 pub mod thread;
 pub mod sync;
 
+#[macro_use]
+#[path = "sys/common/mod.rs"] mod sys_common;
+
 #[cfg(unix)]
 #[path = "sys/unix/mod.rs"] mod sys;
 #[cfg(windows)]
 #[path = "sys/windows/mod.rs"] mod sys;
 
-#[path = "sys/common/mod.rs"] mod sys_common;
-
 pub mod rt;
 mod panicking;
 

Diff for: src/libstd/rt/mod.rs

@@ -108,9 +108,7 @@ fn lang_start(main: *const u8, argc: int, argv: *const *const u8) -> int {
         // but we just do this to name the main thread and to give it correct
         // info about the stack bounds.
         let thread: Thread = NewThread::new(Some("<main>".to_string()));
-        thread_info::set((my_stack_bottom, my_stack_top),
-                         sys::thread::guard::main(),
-                         thread);
+        thread_info::set(sys::thread::guard::main(), thread);
 
         // By default, some platforms will send a *signal* when a EPIPE error
         // would otherwise be delivered. This runtime doesn't install a SIGPIPE

Diff for: src/libstd/sys/common/helper_thread.rs

@@ -70,6 +70,17 @@ struct RaceBox(helper_signal::signal);
 unsafe impl Send for RaceBox {}
 unsafe impl Sync for RaceBox {}
 
+macro_rules! helper_init { (static $name:ident: Helper<$m:ty>) => (
+    static $name: Helper<$m> = Helper {
+        lock: ::sync::MUTEX_INIT,
+        cond: ::sync::CONDVAR_INIT,
+        chan: ::cell::UnsafeCell { value: 0 as *mut Sender<$m> },
+        signal: ::cell::UnsafeCell { value: 0 },
+        initialized: ::cell::UnsafeCell { value: false },
+        shutdown: ::cell::UnsafeCell { value: false },
+    };
+) }
+
 impl<M: Send> Helper<M> {
     /// Lazily boots a helper thread, becoming a no-op if the helper has already
     /// been spawned.

Diff for: src/libstd/sys/common/mod.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 #![allow(missing_docs)]
-#![allow(dead_code)]
 
 use old_io::{self, IoError, IoResult};
 use prelude::v1::*;
@@ -19,9 +18,10 @@ use num::Int;
 use old_path::BytesContainer;
 use collections;
 
+#[macro_use] pub mod helper_thread;
+
 pub mod backtrace;
 pub mod condvar;
-pub mod helper_thread;
 pub mod mutex;
 pub mod net;
 pub mod net2;

Diff for: src/libstd/sys/common/net.rs

@@ -26,7 +26,9 @@ use str;
 use sys::{self, retry, c, sock_t, last_error, last_net_error, last_gai_error, close_sock,
           wrlen, msglen_t, os, wouldblock, set_nonblocking, timer, ms_to_timeval,
           decode_error_detailed};
-use sync::{Arc, Mutex, MutexGuard};
+use sync::{Arc, Mutex};
+#[cfg(not(target_os = "linux"))]
+use sync::MutexGuard;
 use sys_common::{self, keep_going, short_write, timeout};
 use cmp;
 use old_io;
@@ -620,11 +622,13 @@ impl Drop for Inner {
     fn drop(&mut self) { unsafe { close_sock(self.fd); } }
 }
 
+#[cfg(not(target_os = "linux"))]
 pub struct Guard<'a> {
     pub fd: sock_t,
     pub guard: MutexGuard<'a, ()>,
 }
 
+#[cfg(not(target_os = "linux"))]
 #[unsafe_destructor]
 impl<'a> Drop for Guard<'a> {
     fn drop(&mut self) {

Diff for: src/libstd/sys/common/net2.rs

@@ -15,7 +15,6 @@ use io::{self, Error, ErrorKind};
 use libc::{self, c_int, c_char, c_void, socklen_t};
 use mem;
 use net::{IpAddr, SocketAddr, Shutdown};
-use num::Int;
 use sys::c;
 use sys::net::{cvt, cvt_r, cvt_gai, Socket, init, wrlen_t};
 use sys_common::{AsInner, FromInner, IntoInner};
@@ -24,9 +23,6 @@ use sys_common::{AsInner, FromInner, IntoInner};
 // sockaddr and misc bindings
 ////////////////////////////////////////////////////////////////////////////////
 
-fn hton<I: Int>(i: I) -> I { i.to_be() }
-fn ntoh<I: Int>(i: I) -> I { Int::from_be(i) }
-
 fn setsockopt<T>(sock: &Socket, opt: c_int, val: c_int,
                      payload: T) -> io::Result<()> {
     unsafe {
@@ -39,7 +35,7 @@ fn setsockopt<T>(sock: &Socket, opt: c_int, val: c_int,
 
 #[allow(dead_code)]
 fn getsockopt<T: Copy>(sock: &Socket, opt: c_int,
-                           val: c_int) -> io::Result<T> {
+                       val: c_int) -> io::Result<T> {
     unsafe {
         let mut slot: T = mem::zeroed();
         let mut len = mem::size_of::<T>() as socklen_t;

Diff for: src/libstd/sys/common/stack.rs

@@ -121,37 +121,6 @@ pub unsafe fn record_os_managed_stack_bounds(stack_lo: uint, _stack_hi: uint) {
     record_sp_limit(stack_lo + RED_ZONE);
 }
 
-#[inline(always)]
-pub unsafe fn record_rust_managed_stack_bounds(stack_lo: uint, stack_hi: uint) {
-    // When the old runtime had segmented stacks, it used a calculation that was
-    // "limit + RED_ZONE + FUDGE". The red zone was for things like dynamic
-    // symbol resolution, llvm function calls, etc. In theory this red zone
-    // value is 0, but it matters far less when we have gigantic stacks because
-    // we don't need to be so exact about our stack budget. The "fudge factor"
-    // was because LLVM doesn't emit a stack check for functions < 256 bytes in
-    // size. Again though, we have giant stacks, so we round all these
-    // calculations up to the nice round number of 20k.
-    record_sp_limit(stack_lo + RED_ZONE);
-
-    return target_record_stack_bounds(stack_lo, stack_hi);
-
-    #[cfg(not(windows))] #[inline(always)]
-    unsafe fn target_record_stack_bounds(_stack_lo: uint, _stack_hi: uint) {}
-
-    #[cfg(all(windows, target_arch = "x86"))] #[inline(always)]
-    unsafe fn target_record_stack_bounds(stack_lo: uint, stack_hi: uint) {
-        // stack range is at TIB: %fs:0x04 (top) and %fs:0x08 (bottom)
-        asm!("mov $0, %fs:0x04" :: "r"(stack_hi) :: "volatile");
-        asm!("mov $0, %fs:0x08" :: "r"(stack_lo) :: "volatile");
-    }
-    #[cfg(all(windows, target_arch = "x86_64"))] #[inline(always)]
-    unsafe fn target_record_stack_bounds(stack_lo: uint, stack_hi: uint) {
-        // stack range is at TIB: %gs:0x08 (top) and %gs:0x10 (bottom)
-        asm!("mov $0, %gs:0x08" :: "r"(stack_hi) :: "volatile");
-        asm!("mov $0, %gs:0x10" :: "r"(stack_lo) :: "volatile");
-    }
-}
-
 /// Records the current limit of the stack as specified by `end`.
 ///
 /// This is stored in an OS-dependent location, likely inside of the thread

Diff for: src/libstd/sys/common/thread_info.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![allow(dead_code)] // stack_guard isn't used right now on all platforms
+
 use core::prelude::*;
 
 use cell::RefCell;
@@ -16,10 +18,6 @@ use thread::Thread;
 use thread_local::State;
 
 struct ThreadInfo {
-    // This field holds the known bounds of the stack in (lo, hi)
-    // form. Not all threads necessarily know their precise bounds,
-    // hence this is optional.
-    stack_bounds: (uint, uint),
     stack_guard: uint,
     thread: Thread,
 }
@@ -36,7 +34,6 @@ impl ThreadInfo {
         THREAD_INFO.with(move |c| {
             if c.borrow().is_none() {
                 *c.borrow_mut() = Some(ThreadInfo {
-                    stack_bounds: (0, 0),
                     stack_guard: 0,
                     thread: NewThread::new(None),
                 })
@@ -54,10 +51,9 @@ pub fn stack_guard() -> uint {
     ThreadInfo::with(|info| info.stack_guard)
 }
 
-pub fn set(stack_bounds: (uint, uint), stack_guard: uint, thread: Thread) {
+pub fn set(stack_guard: uint, thread: Thread) {
     THREAD_INFO.with(|c| assert!(c.borrow().is_none()));
     THREAD_INFO.with(move |c| *c.borrow_mut() = Some(ThreadInfo{
-        stack_bounds: stack_bounds,
         stack_guard: stack_guard,
         thread: thread,
     }));

Diff for: src/libstd/sys/common/thread_local.rs

@@ -56,6 +56,7 @@
 
 #![allow(non_camel_case_types)]
 #![unstable(feature = "thread_local_internals")]
+#![allow(dead_code)] // sys isn't exported yet
 
 use prelude::v1::*;
 

Diff for: src/libstd/sys/common/wtf8.rs

@@ -21,6 +21,10 @@
 //! nor can it decode WTF-8 from arbitrary bytes.
 //! WTF-8 strings can be obtained from UTF-8, UTF-16, or code points.
 
+// this module is imported from @SimonSapin's repo and has tons of dead code on
+// unix (it's mostly used on windows), so don't worry about dead code here.
+#![allow(dead_code)]
+
 use core::prelude::*;
 
 use core::char::{encode_utf8_raw, encode_utf16_raw};

Diff for: src/libstd/sys/unix/backtrace.rs

@@ -151,7 +151,7 @@ pub fn write(w: &mut Writer) -> IoResult<()> {
     // I/O done here is blocking I/O, not green I/O, so we don't have to
     // worry about this being a native vs green mutex.
     static LOCK: StaticMutex = MUTEX_INIT;
-    let _g = unsafe { LOCK.lock() };
+    let _g = LOCK.lock();
 
     try!(writeln!(w, "stack backtrace:"));
 

Diff for: src/libstd/sys/unix/fd.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 use core::prelude::*;
-use io::prelude::*;
 
 use io;
 use libc::{self, c_int, size_t, c_void};

Diff for: src/libstd/sys/unix/fs2.rs

@@ -13,8 +13,8 @@ use io::prelude::*;
 use os::unix::prelude::*;
 
 use ffi::{CString, CStr, OsString, AsOsStr, OsStr};
-use io::{self, Error, Seek, SeekFrom};
-use libc::{self, c_int, c_void, size_t, off_t, c_char, mode_t};
+use io::{self, Error, SeekFrom};
+use libc::{self, c_int, size_t, off_t, c_char, mode_t};
 use mem;
 use path::{Path, PathBuf};
 use ptr;
@@ -324,14 +324,6 @@ pub fn rmdir(p: &Path) -> io::Result<()> {
     Ok(())
 }
 
-pub fn chown(p: &Path, uid: isize, gid: isize) -> io::Result<()> {
-    let p = try!(cstr(p));
-    try!(cvt_r(|| unsafe {
-        libc::chown(p.as_ptr(), uid as libc::uid_t, gid as libc::gid_t)
-    }));
-    Ok(())
-}
-
 pub fn readlink(p: &Path) -> io::Result<PathBuf> {
     let c_path = try!(cstr(p));
     let p = c_path.as_ptr();

Diff for: src/libstd/sys/unix/mod.rs

@@ -10,33 +10,17 @@
 
 #![allow(missing_docs)]
 #![allow(non_camel_case_types)]
-#![allow(unused_imports)]
-#![allow(dead_code)]
-#![allow(unused_unsafe)]
-#![allow(unused_mut)]
 
 use prelude::v1::*;
 
 use ffi::CStr;
 use io::{self, ErrorKind};
 use libc;
 use num::{Int, SignedInt};
-use num;
-use old_io::{self, IoResult, IoError};
+use old_io::{self, IoError};
 use str;
 use sys_common::mkerr_libc;
 
-macro_rules! helper_init { (static $name:ident: Helper<$m:ty>) => (
-    static $name: Helper<$m> = Helper {
-        lock: ::sync::MUTEX_INIT,
-        cond: ::sync::CONDVAR_INIT,
-        chan: ::cell::UnsafeCell { value: 0 as *mut Sender<$m> },
-        signal: ::cell::UnsafeCell { value: 0 },
-        initialized: ::cell::UnsafeCell { value: false },
-        shutdown: ::cell::UnsafeCell { value: false },
-    };
-) }
-
 pub mod backtrace;
 pub mod c;
 pub mod condvar;

Diff for: src/libstd/sys/unix/mutex.rs

@@ -12,7 +12,6 @@ use prelude::v1::*;
 
 use cell::UnsafeCell;
 use sys::sync as ffi;
-use sys_common::mutex;
 
 pub struct Mutex { inner: UnsafeCell<ffi::pthread_mutex_t> }
 
@@ -28,6 +27,7 @@ pub const MUTEX_INIT: Mutex = Mutex {
 unsafe impl Send for Mutex {}
 unsafe impl Sync for Mutex {}
 
+#[allow(dead_code)] // sys isn't exported yet
 impl Mutex {
     #[inline]
     pub unsafe fn new() -> Mutex {

Diff for: src/libstd/sys/unix/os.rs

@@ -10,6 +10,8 @@
 
 //! Implementation of `std::os` functionality for unix systems
 
+#![allow(unused_imports)] // lots of cfg code here
+
 use prelude::v1::*;
 use os::unix::*;
 
@@ -482,7 +484,7 @@ pub fn home_dir() -> Option<PathBuf> {
     #[cfg(not(any(target_os = "android",
                   target_os = "ios")))]
     unsafe fn fallback() -> Option<OsString> {
-        let mut amt = match libc::sysconf(c::_SC_GETPW_R_SIZE_MAX) {
+        let amt = match libc::sysconf(c::_SC_GETPW_R_SIZE_MAX) {
             n if n < 0 => 512 as usize,
             n => n as usize,
         };

Diff for: src/libstd/sys/unix/os_str.rs

@@ -70,7 +70,7 @@ impl Slice {
     }
 
     pub fn from_str(s: &str) -> &Slice {
-        unsafe { mem::transmute(s.as_bytes()) }
+        Slice::from_u8_slice(s.as_bytes())
     }
 
     pub fn to_str(&self) -> Option<&str> {

Diff for: src/libstd/sys/unix/pipe.rs

@@ -143,7 +143,7 @@ impl UnixStream {
     fn lock_nonblocking<'a>(&'a self) -> Guard<'a> {
         let ret = Guard {
             fd: self.fd(),
-            guard: unsafe { self.inner.lock.lock().unwrap() },
+            guard: self.inner.lock.lock().unwrap(),
         };
         set_nonblocking(self.fd(), true);
         ret