Auto merge of #89549 - Manishearth:rollup-mhkyc16, r=Manishearth

Rollup of 12 pull requests

Successful merges:

 - #87631 (os current_exe using same approach as linux to get always the full ab…)
 - #88234 (rustdoc-json: Don't ignore impls for primitive types)
 - #88651 (Use the 64b inner:monotonize() implementation not the 128b one for aarch64)
 - #88816 (Rustdoc migrate to table so the gui can handle >2k constants)
 - #89244 (refactor: VecDeques PairSlices fields to private)
 - #89364 (rustdoc-json: Encode json files with UTF-8)
 - #89423 (Fix ICE caused by non_exaustive_omitted_patterns struct lint)
 - #89426 (bootstrap: add config option for nix patching)
 - #89462 (haiku thread affinity build fix)
 - #89482 (Follow the diagnostic output style guide)
 - #89504 (Don't suggest replacing region with 'static in NLL)
 - #89535 (fix busted JavaScript in error index generator)

Failed merges:

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

3 files changed, 29 insertions, 21 deletions

diff --git a/library/std/src/sys/unix/os.rs b/library/std/src/sys/unix/os.rs
index 1d5ffb07321..87893d26912 100644
--- a/library/std/src/sys/unix/os.rs
+++ b/library/std/src/sys/unix/os.rs
@@ -380,20 +380,24 @@ pub fn current_exe() -> io::Result<PathBuf> {
 
 #[cfg(any(target_os = "solaris", target_os = "illumos"))]
 pub fn current_exe() -> io::Result<PathBuf> {
-    extern "C" {
-        fn getexecname() -> *const c_char;
-    }
-    unsafe {
-        let path = getexecname();
-        if path.is_null() {
-            Err(io::Error::last_os_error())
-        } else {
-            let filename = CStr::from_ptr(path).to_bytes();
-            let path = PathBuf::from(<OsStr as OsStrExt>::from_bytes(filename));
+    if let Ok(path) = crate::fs::read_link("/proc/self/path/a.out") {
+        Ok(path)
+    } else {
+        extern "C" {
+            fn getexecname() -> *const c_char;
+        }
+        unsafe {
+            let path = getexecname();
+            if path.is_null() {
+                Err(io::Error::last_os_error())
+            } else {
+                let filename = CStr::from_ptr(path).to_bytes();
+                let path = PathBuf::from(<OsStr as OsStrExt>::from_bytes(filename));
 
-            // Prepend a current working directory to the path if
-            // it doesn't contain an absolute pathname.
-            if filename[0] == b'/' { Ok(path) } else { getcwd().map(|cwd| cwd.join(path)) }
+                // Prepend a current working directory to the path if
+                // it doesn't contain an absolute pathname.
+                if filename[0] == b'/' { Ok(path) } else { getcwd().map(|cwd| cwd.join(path)) }
+            }
         }
     }
 }
diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs
index 05f51a46168..5631834eca6 100644
--- a/library/std/src/sys/unix/thread.rs
+++ b/library/std/src/sys/unix/thread.rs
@@ -339,14 +339,18 @@ pub fn available_concurrency() -> io::Result<NonZeroUsize> {
 
             Ok(unsafe { NonZeroUsize::new_unchecked(cpus as usize) })
         } else if #[cfg(target_os = "haiku")] {
-            let mut sinfo: libc::system_info = crate::mem::zeroed();
-            let res = libc::get_system_info(&mut sinfo);
+            // system_info cpu_count field gets the static data set at boot time with `smp_set_num_cpus`
+            // `get_system_info` calls then `smp_get_num_cpus`
+            unsafe {
+                let mut sinfo: libc::system_info = crate::mem::zeroed();
+                let res = libc::get_system_info(&mut sinfo);
 
-            if res != libc::B_OK {
-                return Err(io::Error::last_os_error());
-            }
+                if res != libc::B_OK {
+                    return Err(io::Error::new_const(io::ErrorKind::NotFound, &"The number of hardware threads is not known for the target platform"));
+                }
 
-            Ok(unsafe { NonZeroUsize::new_unchecked(sinfo.cpu_count as usize) })
+                Ok(NonZeroUsize::new_unchecked(sinfo.cpu_count as usize))
+            }
         } else {
             // FIXME: implement on vxWorks, Redox, l4re
             Err(io::Error::new_const(io::ErrorKind::Unsupported, &"Getting the number of hardware threads is not supported on the target platform"))
diff --git a/library/std/src/time/monotonic.rs b/library/std/src/time/monotonic.rs
index 198ae739b55..64f16245c2b 100644
--- a/library/std/src/time/monotonic.rs
+++ b/library/std/src/time/monotonic.rs
@@ -5,7 +5,7 @@ pub(super) fn monotonize(raw: time::Instant) -> time::Instant {
     inner::monotonize(raw)
 }
 
-#[cfg(all(target_has_atomic = "64", not(target_has_atomic = "128")))]
+#[cfg(any(all(target_has_atomic = "64", not(target_has_atomic = "128")), target_arch = "aarch64"))]
 pub mod inner {
     use crate::sync::atomic::AtomicU64;
     use crate::sync::atomic::Ordering::*;
@@ -71,7 +71,7 @@ pub mod inner {
     }
 }
 
-#[cfg(target_has_atomic = "128")]
+#[cfg(all(target_has_atomic = "128", not(target_arch = "aarch64")))]
 pub mod inner {
     use crate::sync::atomic::AtomicU128;
     use crate::sync::atomic::Ordering::*;