Auto merge of rust-lang#87725 - JohnTitor:rollup-2ywcpuk, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - rust-lang#87645 (Properly find owner of closure in THIR unsafeck)
 - rust-lang#87646 (Fix a parser ICE on invalid `fn` body)
 - rust-lang#87652 (Validate that naked functions are never inlined)
 - rust-lang#87685 (Write docs for SyncOnceCell From and Default impl)
 - rust-lang#87693 (Add `aarch64-apple-ios-sim` as a possible target to the manifest)
 - rust-lang#87708 (Add convenience method for handling ipv4-mapped addresses by canonicalizing them)
 - rust-lang#87711 (Correct typo)
 - rust-lang#87716 (Allow generic SIMD array element type)

Failed merges:

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

Author: bors

compiler/rustc_lint_defs/src/builtin.rs

@@ -2720,6 +2720,9 @@ declare_lint! {
     /// The asm block must not contain any operands other than `const` and
     /// `sym`. Additionally, naked function should specify a non-Rust ABI.
     ///
+    /// Naked functions cannot be inlined. All forms of the `inline` attribute
+    /// are prohibited.
+    ///
     /// While other definitions of naked functions were previously accepted,
     /// they are unsupported and might not work reliably. This is a
     /// [future-incompatible] lint that will transition into hard error in

compiler/rustc_mir_build/src/check_unsafety.rs

@@ -599,13 +599,10 @@ pub fn check_unsafety<'tcx>(tcx: TyCtxt<'tcx>, def: ty::WithOptConstParam<LocalD
 
     // Closures are handled by their owner, if it has a body
     if tcx.is_closure(def.did.to_def_id()) {
-        let owner = tcx.hir().local_def_id_to_hir_id(def.did).owner;
-        let owner_hir_id = tcx.hir().local_def_id_to_hir_id(owner);
-
-        if tcx.hir().maybe_body_owned_by(owner_hir_id).is_some() {
-            tcx.ensure().thir_check_unsafety(owner);
-            return;
-        }
+        let hir = tcx.hir();
+        let owner = hir.enclosing_body_owner(hir.local_def_id_to_hir_id(def.did));
+        tcx.ensure().thir_check_unsafety(hir.local_def_id(owner));
+        return;
     }
 
     let (thir, expr) = tcx.thir_body(def);

compiler/rustc_parse/src/parser/item.rs

@@ -1714,13 +1714,11 @@ impl<'a> Parser<'a> {
                     // the AST for typechecking.
                     err.span_label(ident.span, "while parsing this `fn`");
                     err.emit();
-                    (Vec::new(), None)
                 } else {
                     return Err(err);
                 }
-            } else {
-                unreachable!()
             }
+            (Vec::new(), None)
         };
         attrs.extend(inner_attrs);
         Ok(body)

compiler/rustc_passes/src/naked_functions.rs

@@ -1,6 +1,6 @@
 //! Checks validity of naked functions.
 
-use rustc_ast::InlineAsmOptions;
+use rustc_ast::{Attribute, InlineAsmOptions};
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
 use rustc_hir::intravisit::{ErasedMap, FnKind, NestedVisitorMap, Visitor};
@@ -70,10 +70,20 @@ impl<'tcx> Visitor<'tcx> for CheckNakedFunctions<'tcx> {
             check_no_patterns(self.tcx, body.params);
             check_no_parameters_use(self.tcx, body);
             check_asm(self.tcx, hir_id, body, span);
+            check_inline(self.tcx, hir_id, attrs);
         }
     }
 }
 
+/// Check that the function isn't inlined.
+fn check_inline(tcx: TyCtxt<'_>, hir_id: HirId, attrs: &[Attribute]) {
+    for attr in attrs.iter().filter(|attr| attr.has_name(sym::inline)) {
+        tcx.struct_span_lint_hir(UNSUPPORTED_NAKED_FUNCTIONS, hir_id, attr.span, |lint| {
+            lint.build("naked functions cannot be inlined").emit();
+        });
+    }
+}
+
 /// Checks that function uses non-Rust ABI.
 fn check_abi(tcx: TyCtxt<'_>, hir_id: HirId, abi: Abi, fn_ident_span: Span) {
     if abi == Abi::Rust {

compiler/rustc_typeck/src/check/check.rs

@@ -1220,6 +1220,7 @@ pub fn check_simd(tcx: TyCtxt<'_>, sp: Span, def_id: LocalDefId) {
             match e.kind() {
                 ty::Param(_) => (), // pass struct<T>(T, T, T, T) through, let monomorphization catch errors
                 ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::RawPtr(_) => (), // struct(u8, u8, u8, u8) is ok
+                ty::Array(t, _) if matches!(t.kind(), ty::Param(_)) => (), // pass struct<T>([T; N]) through, let monomorphization catch errors
                 ty::Array(t, _clen)
                     if matches!(
                         t.kind(),

library/std/src/lazy.rs

@@ -87,6 +87,19 @@ impl<T: UnwindSafe> UnwindSafe for SyncOnceCell<T> {}
 
 #[unstable(feature = "once_cell", issue = "74465")]
 impl<T> Default for SyncOnceCell<T> {
+    /// Creates a new empty cell.
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// #![feature(once_cell)]
+    ///
+    /// use std::lazy::SyncOnceCell;
+    ///
+    /// fn main() {
+    ///     assert_eq!(SyncOnceCell::<()>::new(), SyncOnceCell::default());
+    /// }
+    /// ```
     fn default() -> SyncOnceCell<T> {
         SyncOnceCell::new()
     }
@@ -118,6 +131,23 @@ impl<T: Clone> Clone for SyncOnceCell<T> {
 
 #[unstable(feature = "once_cell", issue = "74465")]
 impl<T> From<T> for SyncOnceCell<T> {
+    /// Create a new cell with its contents set to `value`.
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// #![feature(once_cell)]
+    ///
+    /// use std::lazy::SyncOnceCell;
+    ///
+    /// # fn main() -> Result<(), i32> {
+    /// let a = SyncOnceCell::from(3);
+    /// let b = SyncOnceCell::new();
+    /// b.set(3)?;
+    /// assert_eq!(a, b);
+    /// Ok(())
+    /// # }
+    /// ```
     fn from(value: T) -> Self {
         let cell = Self::new();
         match cell.set(value) {

library/std/src/net/ip.rs

@@ -379,6 +379,29 @@ impl IpAddr {
     pub const fn is_ipv6(&self) -> bool {
         matches!(self, IpAddr::V6(_))
     }
+
+    /// Converts this address to an `IpAddr::V4` if it is a IPv4-mapped IPv6 addresses, otherwise it
+    /// return `self` as-is.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)).to_canonical().is_loopback(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1)).is_loopback(), false);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1)).to_canonical().is_loopback(), true);
+    /// ```
+    #[inline]
+    #[rustc_const_unstable(feature = "const_ip", issue = "76205")]
+    #[unstable(feature = "ip", issue = "27709")]
+    pub const fn to_canonical(&self) -> IpAddr {
+        match self {
+            &v4 @ IpAddr::V4(_) => v4,
+            IpAddr::V6(v6) => v6.to_canonical(),
+        }
+    }
 }
 
 impl Ipv4Addr {
@@ -1598,6 +1621,28 @@ impl Ipv6Addr {
         }
     }
 
+    /// Converts this address to an `IpAddr::V4` if it is a IPv4-mapped addresses, otherwise it
+    /// returns self wrapped in a `IpAddr::V6`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).is_loopback(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).to_canonical().is_loopback(), true);
+    /// ```
+    #[inline]
+    #[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
+    #[unstable(feature = "ip", issue = "27709")]
+    pub const fn to_canonical(&self) -> IpAddr {
+        if let Some(mapped) = self.to_ipv4_mapped() {
+            return IpAddr::V4(mapped);
+        }
+        IpAddr::V6(*self)
+    }
+
     /// Returns the sixteen eight-bit integers the IPv6 address consists of.
     ///
     /// ```

src/doc/unstable-book/src/library-features/asm.md

@@ -402,7 +402,7 @@ assert_eq!(a, 5);
 
 This will decrement the `{0}` register value from 10 to 3, then add 2 and store it in `a`.
 
-This example show a few thing:
+This example shows a few things:
 
 First that the same number can be used as a label multiple times in the same inline block.
 

src/test/ui/asm/naked-functions.rs

@@ -167,3 +167,46 @@ pub unsafe extern "C" fn valid_c() {
 pub unsafe extern "C" fn valid_att_syntax() {
     asm!("", options(noreturn, att_syntax));
 }
+
+#[naked]
+pub unsafe extern "C" fn inline_none() {
+    asm!("", options(noreturn));
+}
+
+#[naked]
+#[inline]
+//~^ WARN naked functions cannot be inlined
+//~| WARN this was previously accepted
+pub unsafe extern "C" fn inline_hint() {
+    asm!("", options(noreturn));
+}
+
+#[naked]
+#[inline(always)]
+//~^ WARN naked functions cannot be inlined
+//~| WARN this was previously accepted
+pub unsafe extern "C" fn inline_always() {
+    asm!("", options(noreturn));
+}
+
+#[naked]
+#[inline(never)]
+//~^ WARN naked functions cannot be inlined
+//~| WARN this was previously accepted
+pub unsafe extern "C" fn inline_never() {
+    asm!("", options(noreturn));
+}
+
+#[naked]
+#[inline]
+//~^ WARN naked functions cannot be inlined
+//~| WARN this was previously accepted
+#[inline(always)]
+//~^ WARN naked functions cannot be inlined
+//~| WARN this was previously accepted
+#[inline(never)]
+//~^ WARN naked functions cannot be inlined
+//~| WARN this was previously accepted
+pub unsafe extern "C" fn inline_all() {
+    asm!("", options(noreturn));
+}

src/test/ui/asm/naked-functions.stderr

@@ -296,5 +296,59 @@ LL | pub unsafe extern "Rust" fn rust_abi() {
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
 
-error: aborting due to 8 previous errors; 19 warnings emitted
+warning: naked functions cannot be inlined
+  --> $DIR/naked-functions.rs:177:1
+   |
+LL | #[inline]
+   | ^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
+
+warning: naked functions cannot be inlined
+  --> $DIR/naked-functions.rs:185:1
+   |
+LL | #[inline(always)]
+   | ^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
+
+warning: naked functions cannot be inlined
+  --> $DIR/naked-functions.rs:193:1
+   |
+LL | #[inline(never)]
+   | ^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
+
+warning: naked functions cannot be inlined
+  --> $DIR/naked-functions.rs:201:1
+   |
+LL | #[inline]
+   | ^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
+
+warning: naked functions cannot be inlined
+  --> $DIR/naked-functions.rs:204:1
+   |
+LL | #[inline(always)]
+   | ^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
+
+warning: naked functions cannot be inlined
+  --> $DIR/naked-functions.rs:207:1
+   |
+LL | #[inline(never)]
+   | ^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #32408 <https://github.com/rust-lang/rust/issues/32408>
+
+error: aborting due to 8 previous errors; 25 warnings emitted
 

src/test/ui/parser/issue-87635.rs

@@ -0,0 +1,9 @@
+struct Foo {}
+
+impl Foo {
+    pub fn bar()
+    //~^ ERROR: expected `;`, found `}`
+    //~| ERROR: associated function in `impl` without body
+}
+
+fn main() {}

src/test/ui/parser/issue-87635.stderr

@@ -0,0 +1,19 @@
+error: expected `;`, found `}`
+  --> $DIR/issue-87635.rs:4:17
+   |
+LL |     pub fn bar()
+   |                 ^ help: add `;` here
+...
+LL | }
+   | - unexpected token
+
+error: associated function in `impl` without body
+  --> $DIR/issue-87635.rs:4:5
+   |
+LL |     pub fn bar()
+   |     ^^^^^^^^^^^-
+   |                |
+   |                help: provide a definition for the function: `{ <body> }`
+
+error: aborting due to 2 previous errors
+