Auto merge of rust-lang#86527 - JohnTitor:rollup-cbu78g4, r=JohnTitor

Rollup of 11 pull requests

Successful merges:

 - rust-lang#85054 (Revert SGX inline asm syntax)
 - rust-lang#85182 (Move `available_concurrency` implementation to `sys`)
 - rust-lang#86037 (Add `io::Cursor::{remaining, remaining_slice, is_empty}`)
 - rust-lang#86114 (Reopen rust-lang#79692 (Format symbols under shared frames))
 - rust-lang#86297 (Allow to pass arguments to rustdoc-gui tool)
 - rust-lang#86334 (Resolve type aliases to the type they point to in intra-doc links)
 - rust-lang#86367 (Fix comment about rustc_inherit_overflow_checks in abs().)
 - rust-lang#86381 (Add regression test for issue rust-lang#39161)
 - rust-lang#86387 (Remove `#[allow(unused_lifetimes)]` which is now unnecessary)
 - rust-lang#86398 (Add regression test for issue rust-lang#54685)
 - rust-lang#86493 (Say "this enum variant takes"/"this struct takes" instead of "this function takes")

Failed merges:

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

Author: bors

std/src/backtrace.rs

@@ -399,12 +399,11 @@ impl fmt::Display for Backtrace {
         let mut f = backtrace_rs::BacktraceFmt::new(fmt, style, &mut print_path);
         f.add_context()?;
         for frame in frames {
-            let mut f = f.frame();
             if frame.symbols.is_empty() {
-                f.print_raw(frame.frame.ip(), None, None, None)?;
+                f.frame().print_raw(frame.frame.ip(), None, None, None)?;
             } else {
                 for symbol in frame.symbols.iter() {
-                    f.print_raw_with_column(
+                    f.frame().print_raw_with_column(
                         frame.frame.ip(),
                         symbol.name.as_ref().map(|b| backtrace_rs::SymbolName::new(b)),
                         symbol.filename.as_ref().map(|b| match b {

std/src/io/cursor.rs

@@ -205,6 +205,88 @@ impl<T> Cursor<T> {
     }
 }
 
+impl<T> Cursor<T>
+where
+    T: AsRef<[u8]>,
+{
+    /// Returns the remaining length.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(cursor_remaining)]
+    /// use std::io::Cursor;
+    ///
+    /// let mut buff = Cursor::new(vec![1, 2, 3, 4, 5]);
+    ///
+    /// assert_eq!(buff.remaining(), 5);
+    ///
+    /// buff.set_position(2);
+    /// assert_eq!(buff.remaining(), 3);
+    ///
+    /// buff.set_position(4);
+    /// assert_eq!(buff.remaining(), 1);
+    ///
+    /// buff.set_position(6);
+    /// assert_eq!(buff.remaining(), 0);
+    /// ```
+    #[unstable(feature = "cursor_remaining", issue = "86369")]
+    pub fn remaining(&self) -> u64 {
+        (self.inner.as_ref().len() as u64).checked_sub(self.pos).unwrap_or(0)
+    }
+
+    /// Returns the remaining slice.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(cursor_remaining)]
+    /// use std::io::Cursor;
+    ///
+    /// let mut buff = Cursor::new(vec![1, 2, 3, 4, 5]);
+    ///
+    /// assert_eq!(buff.remaining_slice(), &[1, 2, 3, 4, 5]);
+    ///
+    /// buff.set_position(2);
+    /// assert_eq!(buff.remaining_slice(), &[3, 4, 5]);
+    ///
+    /// buff.set_position(4);
+    /// assert_eq!(buff.remaining_slice(), &[5]);
+    ///
+    /// buff.set_position(6);
+    /// assert_eq!(buff.remaining_slice(), &[]);
+    /// ```
+    #[unstable(feature = "cursor_remaining", issue = "86369")]
+    pub fn remaining_slice(&self) -> &[u8] {
+        let len = self.pos.min(self.inner.as_ref().len() as u64);
+        &self.inner.as_ref()[(len as usize)..]
+    }
+
+    /// Returns `true` if the remaining slice is empty.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(cursor_remaining)]
+    /// use std::io::Cursor;
+    ///
+    /// let mut buff = Cursor::new(vec![1, 2, 3, 4, 5]);
+    ///
+    /// buff.set_position(2);
+    /// assert!(!buff.is_empty());
+    ///
+    /// buff.set_position(5);
+    /// assert!(buff.is_empty());
+    ///
+    /// buff.set_position(10);
+    /// assert!(buff.is_empty());
+    /// ```
+    #[unstable(feature = "cursor_remaining", issue = "86369")]
+    pub fn is_empty(&self) -> bool {
+        self.pos >= self.inner.as_ref().len() as u64
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Clone for Cursor<T>
 where
@@ -268,7 +350,7 @@ where
     T: AsRef<[u8]>,
 {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        let n = Read::read(&mut self.fill_buf()?, buf)?;
+        let n = Read::read(&mut self.remaining_slice(), buf)?;
         self.pos += n as u64;
         Ok(n)
     }
@@ -291,7 +373,7 @@ where
 
     fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
         let n = buf.len();
-        Read::read_exact(&mut self.fill_buf()?, buf)?;
+        Read::read_exact(&mut self.remaining_slice(), buf)?;
         self.pos += n as u64;
         Ok(())
     }
@@ -308,8 +390,7 @@ where
     T: AsRef<[u8]>,
 {
     fn fill_buf(&mut self) -> io::Result<&[u8]> {
-        let amt = cmp::min(self.pos, self.inner.as_ref().len() as u64);
-        Ok(&self.inner.as_ref()[(amt as usize)..])
+        Ok(self.remaining_slice())
     }
     fn consume(&mut self, amt: usize) {
         self.pos += amt as u64;

std/src/os/fortanix_sgx/arch.rs

@@ -33,13 +33,13 @@ pub fn egetkey(request: &Align512<[u8; 512]>) -> Result<Align16<[u8; 16]>, u32>
 
         asm!(
             // rbx is reserved by LLVM
-            "xchg {0}, rbx",
+            "xchg %rbx, {0}",
             "enclu",
-            "mov rbx, {0}",
+            "mov {0}, %rbx",
             inout(reg) request => _,
             inlateout("eax") ENCLU_EGETKEY => error,
             in("rcx") out.as_mut_ptr(),
-            options(nostack),
+            options(att_syntax, nostack),
         );
 
         match error {
@@ -64,14 +64,14 @@ pub fn ereport(
 
         asm!(
             // rbx is reserved by LLVM
-            "xchg {0}, rbx",
+            "xchg %rbx, {0}",
             "enclu",
-            "mov rbx, {0}",
+            "mov {0}, %rbx",
             inout(reg) targetinfo => _,
             in("eax") ENCLU_EREPORT,
             in("rcx") reportdata,
             in("rdx") report.as_mut_ptr(),
-            options(preserves_flags, nostack),
+            options(att_syntax, preserves_flags, nostack),
         );
 
         report.assume_init()

std/src/sys/sgx/abi/mem.rs

@@ -36,9 +36,9 @@ pub fn image_base() -> u64 {
     let base: u64;
     unsafe {
         asm!(
-            "lea {}, qword ptr [rip + IMAGE_BASE]",
+            "lea IMAGE_BASE(%rip), {}",
             lateout(reg) base,
-            options(nostack, preserves_flags, nomem, pure),
+            options(att_syntax, nostack, preserves_flags, nomem, pure),
         )
     };
     base