5 files changed, 3 insertions, 118 deletions
diff --git a/src/libstd/sys/redox/fast_thread_local.rs b/src/libstd/sys/redox/fast_thread_local.rs
index 1202708a476..05464787a05 100644
--- a/src/libstd/sys/redox/fast_thread_local.rs
+++ b/src/libstd/sys/redox/fast_thread_local.rs
@@ -1,111 +1,4 @@
 #![cfg(target_thread_local)]
 #![unstable(feature = "thread_local_internals", issue = "0")]
 
-use crate::cell::{Cell, UnsafeCell};
-use crate::mem;
-use crate::ptr;
-
-
-pub struct Key<T> {
-    inner: UnsafeCell<Option<T>>,
-
-    // Metadata to keep track of the state of the destructor. Remember that
-    // these variables are thread-local, not global.
-    dtor_registered: Cell<bool>,
-    dtor_running: Cell<bool>,
-}
-
-unsafe impl<T> Sync for Key<T> { }
-
-impl<T> Key<T> {
-    pub const fn new() -> Key<T> {
-        Key {
-            inner: UnsafeCell::new(None),
-            dtor_registered: Cell::new(false),
-            dtor_running: Cell::new(false)
-        }
-    }
-
-    pub fn get(&'static self) -> Option<&'static UnsafeCell<Option<T>>> {
-        unsafe {
-            if mem::needs_drop::<T>() && self.dtor_running.get() {
-                return None
-            }
-            self.register_dtor();
-        }
-        Some(&self.inner)
-    }
-
-    unsafe fn register_dtor(&self) {
-        if !mem::needs_drop::<T>() || self.dtor_registered.get() {
-            return
-        }
-
-        register_dtor(self as *const _ as *mut u8,
-                      destroy_value::<T>);
-        self.dtor_registered.set(true);
-    }
-}
-
-pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
-    // The fallback implementation uses a vanilla OS-based TLS key to track
-    // the list of destructors that need to be run for this thread. The key
-    // then has its own destructor which runs all the other destructors.
-    //
-    // The destructor for DTORS is a little special in that it has a `while`
-    // loop to continuously drain the list of registered destructors. It
-    // *should* be the case that this loop always terminates because we
-    // provide the guarantee that a TLS key cannot be set after it is
-    // flagged for destruction.
-    use crate::sys_common::thread_local as os;
-
-    static DTORS: os::StaticKey = os::StaticKey::new(Some(run_dtors));
-    type List = Vec<(*mut u8, unsafe extern fn(*mut u8))>;
-    if DTORS.get().is_null() {
-        let v: Box<List> = box Vec::new();
-        DTORS.set(Box::into_raw(v) as *mut u8);
-    }
-    let list: &mut List = &mut *(DTORS.get() as *mut List);
-    list.push((t, dtor));
-
-    unsafe extern fn run_dtors(mut ptr: *mut u8) {
-        while !ptr.is_null() {
-            let list: Box<List> = Box::from_raw(ptr as *mut List);
-            for (ptr, dtor) in list.into_iter() {
-                dtor(ptr);
-            }
-            ptr = DTORS.get();
-            DTORS.set(ptr::null_mut());
-        }
-    }
-}
-
-pub unsafe extern fn destroy_value<T>(ptr: *mut u8) {
-    let ptr = ptr as *mut Key<T>;
-    // Right before we run the user destructor be sure to flag the
-    // destructor as running for this thread so calls to `get` will return
-    // `None`.
-    (*ptr).dtor_running.set(true);
-
-    // The macOS implementation of TLS apparently had an odd aspect to it
-    // where the pointer we have may be overwritten while this destructor
-    // is running. Specifically if a TLS destructor re-accesses TLS it may
-    // trigger a re-initialization of all TLS variables, paving over at
-    // least some destroyed ones with initial values.
-    //
-    // This means that if we drop a TLS value in place on macOS that we could
-    // revert the value to its original state halfway through the
-    // destructor, which would be bad!
-    //
-    // Hence, we use `ptr::read` on macOS (to move to a "safe" location)
-    // instead of drop_in_place.
-    if cfg!(target_os = "macos") {
-        ptr::read((*ptr).inner.get());
-    } else {
-        ptr::drop_in_place((*ptr).inner.get());
-    }
-}
-
-pub fn requires_move_before_drop() -> bool {
-    false
-}
+pub use crate::sys_common::thread_local::register_dtor_fallback as register_dtor;
diff --git a/src/libstd/sys/unix/fast_thread_local.rs b/src/libstd/sys/unix/fast_thread_local.rs
index 17478dce4fe..c34c2e6e786 100644
--- a/src/libstd/sys/unix/fast_thread_local.rs
+++ b/src/libstd/sys/unix/fast_thread_local.rs
@@ -82,7 +82,3 @@ pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
         }
     }
 }
-
-pub fn requires_move_before_drop() -> bool {
-    false
-}
diff --git a/src/libstd/sys/wasi/args.rs b/src/libstd/sys/wasi/args.rs
index 9c8e59e4fb5..8b4b354d9fc 100644
--- a/src/libstd/sys/wasi/args.rs
+++ b/src/libstd/sys/wasi/args.rs
@@ -32,7 +32,7 @@ fn maybe_args() -> io::Result<Args> {
         let (mut argc, mut argv_buf_size) = (0, 0);
         cvt_wasi(libc::__wasi_args_sizes_get(&mut argc, &mut argv_buf_size))?;
 
-        let mut argc = vec![0 as *mut libc::c_char; argc];
+        let mut argc = vec![core::ptr::null_mut::<libc::c_char>(); argc];
         let mut argv_buf = vec![0; argv_buf_size];
         cvt_wasi(libc::__wasi_args_get(argc.as_mut_ptr(), argv_buf.as_mut_ptr()))?;
 
diff --git a/src/libstd/sys/wasm/thread_local_atomics.rs b/src/libstd/sys/wasm/thread_local_atomics.rs
index b408ad0d5c1..3dc0bb24553 100644
--- a/src/libstd/sys/wasm/thread_local_atomics.rs
+++ b/src/libstd/sys/wasm/thread_local_atomics.rs
@@ -11,7 +11,7 @@ struct ThreadControlBlock {
 impl ThreadControlBlock {
     fn new() -> ThreadControlBlock {
         ThreadControlBlock {
-            keys: [0 as *mut u8; MAX_KEYS],
+            keys: [core::ptr::null_mut(); MAX_KEYS],
         }
     }
 
diff --git a/src/libstd/sys/windows/fast_thread_local.rs b/src/libstd/sys/windows/fast_thread_local.rs
index 0ccc67e3fd5..31d0bd1e72e 100644
--- a/src/libstd/sys/windows/fast_thread_local.rs
+++ b/src/libstd/sys/windows/fast_thread_local.rs
@@ -2,7 +2,3 @@
 #![cfg(target_thread_local)]
 
 pub use crate::sys_common::thread_local::register_dtor_fallback as register_dtor;
-
-pub fn requires_move_before_drop() -> bool {
-    false
-}