Auto merge of #128504 - matthiaskrgr:rollup-pawylnk, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #127490 (Add target page for riscv64gc-unknown-linux-gnu)
 - #128433 (fix(hermit): `deny(unsafe_op_in_unsafe_fn)`)
 - #128482 (interpret: on a signed deref check, mention the right pointer in the error)
 - #128496 (Fix removed `box_syntax` diagnostic if source isn't available)
 - #128497 (fix dropck documentation for `[T;0]` special-case)
 - #128499 (chore: refactor backtrace formatting)

r? `@ghost`
`@rustbot` modify labels: rollup

6 files changed, 57 insertions, 55 deletions

diff --git a/library/std/src/sys/pal/hermit/alloc.rs b/library/std/src/sys/pal/hermit/alloc.rs
index 2cd0db90940..f10d5f9227e 100644
--- a/library/std/src/sys/pal/hermit/alloc.rs
+++ b/library/std/src/sys/pal/hermit/alloc.rs
@@ -1,31 +1,28 @@
 use super::hermit_abi;
 use crate::alloc::{GlobalAlloc, Layout, System};
-use crate::ptr;
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {
     #[inline]
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        hermit_abi::malloc(layout.size(), layout.align())
-    }
-
-    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
-        let addr = hermit_abi::malloc(layout.size(), layout.align());
-
-        if !addr.is_null() {
-            ptr::write_bytes(addr, 0x00, layout.size());
-        }
-
-        addr
+        let size = layout.size();
+        let align = layout.align();
+        unsafe { hermit_abi::malloc(size, align) }
     }
 
     #[inline]
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
-        hermit_abi::free(ptr, layout.size(), layout.align())
+        let size = layout.size();
+        let align = layout.align();
+        unsafe {
+            hermit_abi::free(ptr, size, align);
+        }
     }
 
     #[inline]
     unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
-        hermit_abi::realloc(ptr, layout.size(), layout.align(), new_size)
+        let size = layout.size();
+        let align = layout.align();
+        unsafe { hermit_abi::realloc(ptr, size, align, new_size) }
     }
 }
diff --git a/library/std/src/sys/pal/hermit/fd.rs b/library/std/src/sys/pal/hermit/fd.rs
index bdcf880484d..79fc13bd4a8 100644
--- a/library/std/src/sys/pal/hermit/fd.rs
+++ b/library/std/src/sys/pal/hermit/fd.rs
@@ -111,7 +111,8 @@ impl FromInner<OwnedFd> for FileDesc {
 
 impl FromRawFd for FileDesc {
     unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
-        Self { fd: FromRawFd::from_raw_fd(raw_fd) }
+        let fd = unsafe { OwnedFd::from_raw_fd(raw_fd) };
+        Self { fd }
     }
 }
 
diff --git a/library/std/src/sys/pal/hermit/fs.rs b/library/std/src/sys/pal/hermit/fs.rs
index cbdb942ac58..aaf1a044d06 100644
--- a/library/std/src/sys/pal/hermit/fs.rs
+++ b/library/std/src/sys/pal/hermit/fs.rs
@@ -484,7 +484,8 @@ impl IntoRawFd for File {
 
 impl FromRawFd for File {
     unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
-        Self(FromRawFd::from_raw_fd(raw_fd))
+        let file_desc = unsafe { FileDesc::from_raw_fd(raw_fd) };
+        Self(file_desc)
     }
 }
 
diff --git a/library/std/src/sys/pal/hermit/mod.rs b/library/std/src/sys/pal/hermit/mod.rs
index 55583b89d67..ef406b9ec7f 100644
--- a/library/std/src/sys/pal/hermit/mod.rs
+++ b/library/std/src/sys/pal/hermit/mod.rs
@@ -13,7 +13,8 @@
 //! compiling for wasm. That way it's a compile time error for something that's
 //! guaranteed to be a runtime error!
 
-#![allow(missing_docs, nonstandard_style, unsafe_op_in_unsafe_fn)]
+#![deny(unsafe_op_in_unsafe_fn)]
+#![allow(missing_docs, nonstandard_style)]
 
 use crate::os::raw::c_char;
 
@@ -49,9 +50,7 @@ pub fn unsupported_err() -> crate::io::Error {
 }
 
 pub fn abort_internal() -> ! {
-    unsafe {
-        hermit_abi::abort();
-    }
+    unsafe { hermit_abi::abort() }
 }
 
 pub fn hashmap_random_keys() -> (u64, u64) {
@@ -80,7 +79,9 @@ pub extern "C" fn __rust_abort() {
 // SAFETY: must be called only once during runtime initialization.
 // NOTE: this is not guaranteed to run, for example when Rust code is called externally.
 pub unsafe fn init(argc: isize, argv: *const *const u8, _sigpipe: u8) {
-    args::init(argc, argv);
+    unsafe {
+        args::init(argc, argv);
+    }
 }
 
 // SAFETY: must be called only once during runtime cleanup.
@@ -101,10 +102,12 @@ pub unsafe extern "C" fn runtime_entry(
     // initialize environment
     os::init_environment(env as *const *const i8);
 
-    let result = main(argc as isize, argv);
+    let result = unsafe { main(argc as isize, argv) };
 
-    crate::sys::thread_local::destructors::run();
-    hermit_abi::exit(result);
+    unsafe {
+        crate::sys::thread_local::destructors::run();
+    }
+    unsafe { hermit_abi::exit(result) }
 }
 
 #[inline]
diff --git a/library/std/src/sys/pal/hermit/os.rs b/library/std/src/sys/pal/hermit/os.rs
index 9631dac658c..f8ea80afa43 100644
--- a/library/std/src/sys/pal/hermit/os.rs
+++ b/library/std/src/sys/pal/hermit/os.rs
@@ -68,21 +68,21 @@ pub fn current_exe() -> io::Result<PathBuf> {
     unsupported()
 }
 
-static mut ENV: Option<Mutex<HashMap<OsString, OsString>>> = None;
+static ENV: Mutex<Option<HashMap<OsString, OsString>>> = Mutex::new(None);
 
 pub fn init_environment(env: *const *const i8) {
-    unsafe {
-        ENV = Some(Mutex::new(HashMap::new()));
+    let mut guard = ENV.lock().unwrap();
+    let map = guard.insert(HashMap::new());
 
-        if env.is_null() {
-            return;
-        }
+    if env.is_null() {
+        return;
+    }
 
-        let mut guard = ENV.as_ref().unwrap().lock().unwrap();
+    unsafe {
         let mut environ = env;
         while !(*environ).is_null() {
             if let Some((key, value)) = parse(CStr::from_ptr(*environ).to_bytes()) {
-                guard.insert(key, value);
+                map.insert(key, value);
             }
             environ = environ.add(1);
         }
@@ -154,30 +154,26 @@ impl Iterator for Env {
 /// Returns a vector of (variable, value) byte-vector pairs for all the
 /// environment variables of the current process.
 pub fn env() -> Env {
-    unsafe {
-        let guard = ENV.as_ref().unwrap().lock().unwrap();
-        let mut result = Vec::new();
+    let guard = ENV.lock().unwrap();
+    let env = guard.as_ref().unwrap();
 
-        for (key, value) in guard.iter() {
-            result.push((key.clone(), value.clone()));
-        }
+    let result = env.iter().map(|(key, value)| (key.clone(), value.clone())).collect::<Vec<_>>();
 
-        return Env { iter: result.into_iter() };
-    }
+    Env { iter: result.into_iter() }
 }
 
 pub fn getenv(k: &OsStr) -> Option<OsString> {
-    unsafe { ENV.as_ref().unwrap().lock().unwrap().get_mut(k).cloned() }
+    ENV.lock().unwrap().as_ref().unwrap().get(k).cloned()
 }
 
 pub unsafe fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
     let (k, v) = (k.to_owned(), v.to_owned());
-    ENV.as_ref().unwrap().lock().unwrap().insert(k, v);
+    ENV.lock().unwrap().as_mut().unwrap().insert(k, v);
     Ok(())
 }
 
 pub unsafe fn unsetenv(k: &OsStr) -> io::Result<()> {
-    ENV.as_ref().unwrap().lock().unwrap().remove(k);
+    ENV.lock().unwrap().as_mut().unwrap().remove(k);
     Ok(())
 }
 
@@ -190,9 +186,7 @@ pub fn home_dir() -> Option<PathBuf> {
 }
 
 pub fn exit(code: i32) -> ! {
-    unsafe {
-        hermit_abi::exit(code);
-    }
+    unsafe { hermit_abi::exit(code) }
 }
 
 pub fn getpid() -> u32 {
diff --git a/library/std/src/sys/pal/hermit/thread.rs b/library/std/src/sys/pal/hermit/thread.rs
index 95c13e53b47..6321f92e3d9 100644
--- a/library/std/src/sys/pal/hermit/thread.rs
+++ b/library/std/src/sys/pal/hermit/thread.rs
@@ -25,18 +25,22 @@ impl Thread {
         core_id: isize,
     ) -> io::Result<Thread> {
         let p = Box::into_raw(Box::new(p));
-        let tid = hermit_abi::spawn2(
-            thread_start,
-            p.expose_provenance(),
-            hermit_abi::Priority::into(hermit_abi::NORMAL_PRIO),
-            stack,
-            core_id,
-        );
+        let tid = unsafe {
+            hermit_abi::spawn2(
+                thread_start,
+                p.expose_provenance(),
+                hermit_abi::Priority::into(hermit_abi::NORMAL_PRIO),
+                stack,
+                core_id,
+            )
+        };
 
         return if tid == 0 {
             // The thread failed to start and as a result p was not consumed. Therefore, it is
             // safe to reconstruct the box so that it gets deallocated.
-            drop(Box::from_raw(p));
+            unsafe {
+                drop(Box::from_raw(p));
+            }
             Err(io::const_io_error!(io::ErrorKind::Uncategorized, "Unable to create thread!"))
         } else {
             Ok(Thread { tid: tid })
@@ -54,7 +58,9 @@ impl Thread {
     }
 
     pub unsafe fn new(stack: usize, p: Box<dyn FnOnce()>) -> io::Result<Thread> {
-        Thread::new_with_coreid(stack, p, -1 /* = no specific core */)
+        unsafe {
+            Thread::new_with_coreid(stack, p, -1 /* = no specific core */)
+        }
     }
 
     #[inline]