Auto merge of #84342 - Dylan-DPC:rollup-5b40142, r=Dylan-DPC

Rollup of 7 pull requests

Successful merges:

 - #84123 (Introduce CompileMonoItem DepNode)
 - #84126 (Enable sanitizers for x86_64-unknown-linux-musl)
 - #84168 (Lower async fn in traits.)
 - #84256 (doc: use U+2212 for minus sign in floating-point -0.0 remarks)
 - #84291 (fix aliasing violations in thread_local_const_init)
 - #84313 (fix suggestion for unsized function parameters)
 - #84330 (Remove unused footer section)

Failed merges:

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

compiler/rustc_ast_lowering/src/item.rs

@@ -836,9 +836,17 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 (generics, hir::TraitItemKind::Fn(sig, hir::TraitFn::Required(names)))
             }
             AssocItemKind::Fn(box FnKind(_, ref sig, ref generics, Some(ref body))) => {
-                let body_id = self.lower_fn_body_block(i.span, &sig.decl, Some(body));
-                let (generics, sig) =
-                    self.lower_method_sig(generics, sig, trait_item_def_id, false, None, i.id);
+                let asyncness = sig.header.asyncness;
+                let body_id =
+                    self.lower_maybe_async_body(i.span, &sig.decl, asyncness, Some(&body));
+                let (generics, sig) = self.lower_method_sig(
+                    generics,
+                    sig,
+                    trait_item_def_id,
+                    false,
+                    asyncness.opt_return_id(),
+                    i.id,
+                );
                 (generics, hir::TraitItemKind::Fn(sig, hir::TraitFn::Provided(body_id)))
             }
             AssocItemKind::TyAlias(box TyAliasKind(_, ref generics, ref bounds, ref default)) => {

compiler/rustc_middle/src/dep_graph/dep_node.rs

@@ -32,8 +32,8 @@
 //! `DepNode` definition happens in the `define_dep_nodes!()` macro. This macro
 //! defines the `DepKind` enum. Each `DepKind` has its own parameters that are
 //! needed at runtime in order to construct a valid `DepNode` fingerprint.
-//! However, only `CompileCodegenUnit` is constructed explicitly (with
-//! `make_compile_codegen_unit`).
+//! However, only `CompileCodegenUnit` and `CompileMonoItem` are constructed
+//! explicitly (with `make_compile_codegen_unit` cq `make_compile_mono_item`).
 //!
 //! Because the macro sees what parameters a given `DepKind` requires, it can
 //! "infer" some properties for each kind of `DepNode`:
@@ -46,15 +46,17 @@
 //!   `DefId` it was computed from. In other cases, too much information gets
 //!   lost during fingerprint computation.
 //!
-//! `make_compile_codegen_unit`, together with `DepNode::new()`, ensures that only
-//! valid `DepNode` instances can be constructed. For example, the API does not
-//! allow for constructing parameterless `DepNode`s with anything other
-//! than a zeroed out fingerprint. More generally speaking, it relieves the
-//! user of the `DepNode` API of having to know how to compute the expected
-//! fingerprint for a given set of node parameters.
+//! `make_compile_codegen_unit` and `make_compile_mono_items`, together with
+//! `DepNode::new()`, ensures that only valid `DepNode` instances can be
+//! constructed. For example, the API does not allow for constructing
+//! parameterless `DepNode`s with anything other than a zeroed out fingerprint.
+//! More generally speaking, it relieves the user of the `DepNode` API of
+//! having to know how to compute the expected fingerprint for a given set of
+//! node parameters.
 //!
 //! [dependency graph]: https://rustc-dev-guide.rust-lang.org/query.html
 
+use crate::mir::mono::MonoItem;
 use crate::ty::TyCtxt;
 
 use rustc_data_structures::fingerprint::Fingerprint;
@@ -175,6 +177,14 @@ pub mod dep_kind {
         can_reconstruct_query_key: || false,
     };
 
+    pub const CompileMonoItem: DepKindStruct = DepKindStruct {
+        has_params: true,
+        is_anon: false,
+        is_eval_always: false,
+
+        can_reconstruct_query_key: || false,
+    };
+
     macro_rules! define_query_dep_kinds {
         ($(
             [$($attrs:tt)*]
@@ -251,6 +261,10 @@ rustc_dep_node_append!([define_dep_nodes!][ <'tcx>
 
     // WARNING: if `Symbol` is changed, make sure you update `make_compile_codegen_unit` below.
     [] CompileCodegenUnit(Symbol),
+
+    // WARNING: if `MonoItem` is changed, make sure you update `make_compile_mono_item` below.
+    // Only used by rustc_codegen_cranelift
+    [] CompileMonoItem(MonoItem),
 ]);
 
 // WARNING: `construct` is generic and does not know that `CompileCodegenUnit` takes `Symbol`s as keys.
@@ -259,6 +273,12 @@ crate fn make_compile_codegen_unit(tcx: TyCtxt<'_>, name: Symbol) -> DepNode {
     DepNode::construct(tcx, DepKind::CompileCodegenUnit, &name)
 }
 
+// WARNING: `construct` is generic and does not know that `CompileMonoItem` takes `MonoItem`s as keys.
+// Be very careful changing this type signature!
+crate fn make_compile_mono_item(tcx: TyCtxt<'tcx>, mono_item: &MonoItem<'tcx>) -> DepNode {
+    DepNode::construct(tcx, DepKind::CompileMonoItem, mono_item)
+}
+
 pub type DepNode = rustc_query_system::dep_graph::DepNode<DepKind>;
 
 // We keep a lot of `DepNode`s in memory during compilation. It's not

compiler/rustc_middle/src/dep_graph/mod.rs

@@ -12,8 +12,8 @@ pub use rustc_query_system::dep_graph::{
     SerializedDepNodeIndex, WorkProduct, WorkProductId,
 };
 
-crate use dep_node::make_compile_codegen_unit;
 pub use dep_node::{label_strs, DepKind, DepNode, DepNodeExt};
+crate use dep_node::{make_compile_codegen_unit, make_compile_mono_item};
 
 pub type DepGraph = rustc_query_system::dep_graph::DepGraph<DepKind>;
 pub type TaskDeps = rustc_query_system::dep_graph::TaskDeps<DepKind>;

compiler/rustc_middle/src/mir/mono.rs

@@ -181,6 +181,11 @@ impl<'tcx> MonoItem<'tcx> {
         }
         .map(|hir_id| tcx.hir().span(hir_id))
     }
+
+    // Only used by rustc_codegen_cranelift
+    pub fn codegen_dep_node(&self, tcx: TyCtxt<'tcx>) -> DepNode {
+        crate::dep_graph::make_compile_mono_item(tcx, self)
+    }
 }
 
 impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for MonoItem<'tcx> {

compiler/rustc_query_impl/src/plumbing.rs

@@ -438,6 +438,11 @@ macro_rules! define_queries {
                 try_load_from_on_disk_cache: |_, _| {},
             };
 
+            pub const CompileMonoItem: QueryStruct = QueryStruct {
+                force_from_dep_node: |_, _| false,
+                try_load_from_on_disk_cache: |_, _| {},
+            };
+
             $(pub const $name: QueryStruct = {
                 const is_anon: bool = is_anon!([$($modifiers)*]);
 

compiler/rustc_target/src/spec/x86_64_unknown_linux_musl.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, StackProbeType, Target};
+use crate::spec::{LinkerFlavor, SanitizerSet, StackProbeType, Target};
 
 pub fn target() -> Target {
     let mut base = super::linux_musl_base::opts();
@@ -7,6 +7,8 @@ pub fn target() -> Target {
     base.pre_link_args.entry(LinkerFlavor::Gcc).or_default().push("-m64".to_string());
     base.stack_probes = StackProbeType::InlineOrCall { min_llvm_version_for_inline: (11, 0, 1) };
     base.static_position_independent_executables = true;
+    base.supported_sanitizers =
+        SanitizerSet::ADDRESS | SanitizerSet::LEAK | SanitizerSet::MEMORY | SanitizerSet::THREAD;
 
     Target {
         llvm_target: "x86_64-unknown-linux-musl".to_string(),

compiler/rustc_typeck/src/check/gather_locals.rs

@@ -6,7 +6,6 @@ use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKi
 use rustc_middle::ty::Ty;
 use rustc_span::{sym, Span};
 use rustc_trait_selection::traits;
-use std::mem;
 
 pub(super) struct GatherLocalsVisitor<'a, 'tcx> {
     fcx: &'a FnCtxt<'a, 'tcx>,
@@ -14,12 +13,12 @@ pub(super) struct GatherLocalsVisitor<'a, 'tcx> {
     // parameters are special cases of patterns, but we want to handle them as
     // *distinct* cases. so track when we are hitting a pattern *within* an fn
     // parameter.
-    outermost_fn_param_pat: bool,
+    outermost_fn_param_pat: Option<Span>,
 }
 
 impl<'a, 'tcx> GatherLocalsVisitor<'a, 'tcx> {
     pub(super) fn new(fcx: &'a FnCtxt<'a, 'tcx>, parent_id: hir::HirId) -> Self {
-        Self { fcx, parent_id, outermost_fn_param_pat: false }
+        Self { fcx, parent_id, outermost_fn_param_pat: None }
     }
 
     fn assign(&mut self, span: Span, nid: hir::HirId, ty_opt: Option<LocalTy<'tcx>>) -> Ty<'tcx> {
@@ -92,7 +91,7 @@ impl<'a, 'tcx> Visitor<'tcx> for GatherLocalsVisitor<'a, 'tcx> {
     }
 
     fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
-        let old_outermost_fn_param_pat = mem::replace(&mut self.outermost_fn_param_pat, true);
+        let old_outermost_fn_param_pat = self.outermost_fn_param_pat.replace(param.ty_span);
         intravisit::walk_param(self, param);
         self.outermost_fn_param_pat = old_outermost_fn_param_pat;
     }
@@ -102,12 +101,12 @@ impl<'a, 'tcx> Visitor<'tcx> for GatherLocalsVisitor<'a, 'tcx> {
         if let PatKind::Binding(_, _, ident, _) = p.kind {
             let var_ty = self.assign(p.span, p.hir_id, None);
 
-            if self.outermost_fn_param_pat {
+            if let Some(ty_span) = self.outermost_fn_param_pat {
                 if !self.fcx.tcx.features().unsized_fn_params {
                     self.fcx.require_type_is_sized(
                         var_ty,
                         p.span,
-                        traits::SizedArgumentType(Some(p.span)),
+                        traits::SizedArgumentType(Some(ty_span)),
                     );
                 }
             } else {
@@ -123,7 +122,7 @@ impl<'a, 'tcx> Visitor<'tcx> for GatherLocalsVisitor<'a, 'tcx> {
                 var_ty
             );
         }
-        let old_outermost_fn_param_pat = mem::replace(&mut self.outermost_fn_param_pat, false);
+        let old_outermost_fn_param_pat = self.outermost_fn_param_pat.take();
         intravisit::walk_pat(self, p);
         self.outermost_fn_param_pat = old_outermost_fn_param_pat;
     }

library/std/src/primitive_docs.rs

@@ -807,10 +807,10 @@ mod prim_tuple {}
 ///
 /// Additionally, `f32` can represent some special values:
 ///
-/// - -0.0: IEEE 754 floating point numbers have a bit that indicates their sign, so -0.0 is a
-///   possible value. For comparison `-0.0 == +0.0` is true but floating point operations can
-///   carry the sign bit through arithmetic operations. This means `-1.0 * 0.0` produces -0.0 and
-///   a negative number rounded to a value smaller than a float can represent also produces -0.0.
+/// - −0.0: IEEE 754 floating point numbers have a bit that indicates their sign, so −0.0 is a
+///   possible value. For comparison −0.0 = +0.0, but floating point operations can carry
+///   the sign bit through arithmetic operations. This means −0.0 × +0.0 produces −0.0 and
+///   a negative number rounded to a value smaller than a float can represent also produces −0.0.
 /// - [∞](#associatedconstant.INFINITY) and
 ///   [−∞](#associatedconstant.NEG_INFINITY): these result from calculations
 ///   like `1.0 / 0.0`.

library/std/src/thread/local.rs

@@ -217,7 +217,7 @@ macro_rules! __thread_local_inner {
                         //   so now.
                         0 => {
                             $crate::thread::__FastLocalKeyInner::<$t>::register_dtor(
-                                &VAL as *const _ as *mut u8,
+                                $crate::ptr::addr_of_mut!(VAL) as *mut u8,
                                 destroy,
                             );
                             STATE = 1;

src/bootstrap/native.rs

@@ -814,6 +814,9 @@ fn supported_sanitizers(
         "x86_64-unknown-linux-gnu" => {
             common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
         }
+        "x86_64-unknown-linux-musl" => {
+            common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
+        }
         _ => Vec::new(),
     }
 }

src/librustdoc/html/layout.rs

@@ -110,7 +110,6 @@ crate fn render<T: Print, S: Print>(
     </nav>\
     <section id=\"main\" class=\"content\">{content}</section>\
     <section id=\"search\" class=\"content hidden\"></section>\
-    <section class=\"footer\"></section>\
     {after_content}\
     <div id=\"rustdoc-vars\" data-root-path=\"{root_path}\" data-current-crate=\"{krate}\" \
        data-search-index-js=\"{root_path}search-index{suffix}.js\" \

src/test/ui/async-await/async-trait-fn.rs

@@ -2,6 +2,10 @@
 trait T {
     async fn foo() {} //~ ERROR functions in traits cannot be declared `async`
     async fn bar(&self) {} //~ ERROR functions in traits cannot be declared `async`
+    async fn baz() { //~ ERROR functions in traits cannot be declared `async`
+        // Nested item must not ICE.
+        fn a() {}
+    }
 }
 
 fn main() {}

src/test/ui/async-await/async-trait-fn.stderr

@@ -20,6 +20,22 @@ LL |     async fn bar(&self) {}
    = note: `async` trait functions are not currently supported
    = note: consider using the `async-trait` crate: https://crates.io/crates/async-trait
 
-error: aborting due to 2 previous errors
+error[E0706]: functions in traits cannot be declared `async`
+  --> $DIR/async-trait-fn.rs:5:5
+   |
+LL |       async fn baz() {
+   |       ^----
+   |       |
+   |  _____`async` because of this
+   | |
+LL | |         // Nested item must not ICE.
+LL | |         fn a() {}
+LL | |     }
+   | |_____^
+   |
+   = note: `async` trait functions are not currently supported
+   = note: consider using the `async-trait` crate: https://crates.io/crates/async-trait
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0706`.

src/test/ui/error-codes/E0277.stderr

@@ -9,8 +9,8 @@ LL | fn f(p: Path) { }
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn f(&p: Path) { }
-   |      ^
+LL | fn f(p: &Path) { }
+   |         ^
 
 error[E0277]: the trait bound `i32: Foo` is not satisfied
   --> $DIR/E0277.rs:15:15

src/test/ui/feature-gates/feature-gate-unsized_fn_params.stderr

@@ -8,8 +8,8 @@ LL | fn foo(x: dyn Foo) {
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn foo(&x: dyn Foo) {
-   |        ^
+LL | fn foo(x: &dyn Foo) {
+   |           ^
 
 error[E0277]: the size for values of type `(dyn Foo + 'static)` cannot be known at compilation time
   --> $DIR/feature-gate-unsized_fn_params.rs:24:5

src/test/ui/feature-gates/feature-gate-unsized_locals.stderr

@@ -8,8 +8,8 @@ LL | fn f(f: dyn FnOnce()) {}
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn f(&f: dyn FnOnce()) {}
-   |      ^
+LL | fn f(f: &dyn FnOnce()) {}
+   |         ^
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-5883.rs

@@ -4,9 +4,9 @@ struct Struct {
     r: dyn A + 'static
 }
 
-fn new_struct(r: dyn A + 'static)
-    -> Struct { //~^ ERROR the size for values of type
-    //~^ ERROR the size for values of type
+fn new_struct(
+    r: dyn A + 'static //~ ERROR the size for values of type
+) -> Struct {          //~ ERROR the size for values of type
     Struct { r: r }
 }
 

src/test/ui/issues/issue-5883.stderr

@@ -1,22 +1,21 @@
 error[E0277]: the size for values of type `(dyn A + 'static)` cannot be known at compilation time
-  --> $DIR/issue-5883.rs:7:15
+  --> $DIR/issue-5883.rs:8:5
    |
-LL | fn new_struct(r: dyn A + 'static)
-   |               ^ doesn't have a size known at compile-time
+LL |     r: dyn A + 'static
+   |     ^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn A + 'static)`
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn new_struct(&r: dyn A + 'static)
-   |               ^
+LL |     r: &dyn A + 'static
+   |        ^
 
 error[E0277]: the size for values of type `(dyn A + 'static)` cannot be known at compilation time
-  --> $DIR/issue-5883.rs:8:8
+  --> $DIR/issue-5883.rs:9:6
    |
-LL |     -> Struct {
-   |        ^^^^^^ doesn't have a size known at compile-time
-LL |
+LL | ) -> Struct {
+   |      ^^^^^^ doesn't have a size known at compile-time
 LL |     Struct { r: r }
    |     --------------- this returned value is of type `Struct`
    |

src/test/ui/resolve/issue-5035-2.stderr

@@ -8,8 +8,8 @@ LL | fn foo(_x: K) {}
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn foo(&_x: K) {}
-   |        ^
+LL | fn foo(_x: &K) {}
+   |            ^
 
 error: aborting due to previous error
 

src/test/ui/suggestions/path-by-value.stderr

@@ -9,8 +9,8 @@ LL | fn f(p: Path) { }
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn f(&p: Path) { }
-   |      ^
+LL | fn f(p: &Path) { }
+   |         ^
 
 error: aborting due to previous error
 

src/test/ui/traits/bound/not-on-bare-trait.stderr

@@ -16,8 +16,8 @@ LL | fn foo(_x: Foo + Send) {
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn foo(&_x: Foo + Send) {
-   |        ^
+LL | fn foo(_x: &Foo + Send) {
+   |            ^
 
 error: aborting due to previous error; 1 warning emitted
 

src/test/ui/unsized/unsized-fn-arg.fixed

@@ -0,0 +1,6 @@
+// run-rustfix
+#![crate_type="lib"]
+#![allow(unused)]
+
+fn f<T: ?Sized>(t: &T) {}
+//~^ ERROR the size for values of type `T` cannot be known at compilation time

src/test/ui/unsized/unsized-fn-arg.rs

@@ -0,0 +1,6 @@
+// run-rustfix
+#![crate_type="lib"]
+#![allow(unused)]
+
+fn f<T: ?Sized>(t: T) {}
+//~^ ERROR the size for values of type `T` cannot be known at compilation time

src/test/ui/unsized/unsized-fn-arg.stderr

@@ -0,0 +1,17 @@
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> $DIR/unsized-fn-arg.rs:5:17
+   |
+LL | fn f<T: ?Sized>(t: T) {}
+   |      -          ^ doesn't have a size known at compile-time
+   |      |
+   |      this type parameter needs to be `std::marker::Sized`
+   |
+   = help: unsized fn params are gated as an unstable feature
+help: function arguments must have a statically known size, borrowed types always have a known size
+   |
+LL | fn f<T: ?Sized>(t: &T) {}
+   |                    ^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.

src/test/ui/unsized/unsized6.stderr

@@ -135,8 +135,8 @@ LL | fn g1<X: ?Sized>(x: X) {}
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn g1<X: ?Sized>(&x: X) {}
-   |                  ^
+LL | fn g1<X: ?Sized>(x: &X) {}
+   |                     ^
 
 error[E0277]: the size for values of type `X` cannot be known at compilation time
   --> $DIR/unsized6.rs:40:22
@@ -149,8 +149,8 @@ LL | fn g2<X: ?Sized + T>(x: X) {}
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn g2<X: ?Sized + T>(&x: X) {}
-   |                      ^
+LL | fn g2<X: ?Sized + T>(x: &X) {}
+   |                         ^
 
 error: aborting due to 13 previous errors
 

src/tools/clippy/tests/ui/crashes/ice-6251.stderr

@@ -16,8 +16,8 @@ LL | fn bug<T>() -> impl Iterator<Item = [(); { |x: [u8]| x }]> {
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn bug<T>() -> impl Iterator<Item = [(); { |&x: [u8]| x }]> {
-   |                                             ^
+LL | fn bug<T>() -> impl Iterator<Item = [(); { |x: &[u8]| x }]> {
+   |                                                ^
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
   --> $DIR/ice-6251.rs:4:54