Auto merge of #85588 - Mark-Simulacrum:beta-next, r=Mark-Simulacrum

[beta] backports

 * Backport 1.52.1 release notes #85404
 * remove InPlaceIterable marker from Peekable due to unsoundness #85340
 * rustdoc: Call initSidebarItems in root module of crate #85304
 * Update LLVM submodule #85236
 * Do not ICE on invalid const param #84913
 * Disallows #![feature(no_coverage)] on stable and beta (using standard crate-level gating) #84871
 * Ensure TLS destructors run before thread joins in SGX #84409

Author: bors

RELEASES.md

@@ -1,3 +1,24 @@
+Version 1.52.1 (2021-05-10)
+============================
+
+This release disables incremental compilation, unless the user has explicitly
+opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
+
+This is due to the widespread, and frequently occuring, breakage encountered by
+Rust users due to newly enabled incremental verification in 1.52.0. Notably,
+Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
+newly added incremental verification are still present in past stable versions,
+and are not yet fixed on any channel. These bugs can lead to miscompilation of
+Rust binaries.
+
+These problems only affect incremental builds, so release builds with Cargo
+should not be affected unless the user has explicitly opted into incremental.
+Debug and check builds are affected.
+
+See [84970] for more details.
+
+[84970]: https://github.com/rust-lang/rust/issues/84970
+
 Version 1.52.0 (2021-05-06)
 ============================
 

compiler/rustc_builtin_macros/src/deriving/cmp/eq.rs

@@ -15,20 +15,12 @@ pub fn expand_deriving_eq(
     item: &Annotatable,
     push: &mut dyn FnMut(Annotatable),
 ) {
+    let span = cx.with_def_site_ctxt(span);
     let inline = cx.meta_word(span, sym::inline);
-    let no_coverage_ident =
-        rustc_ast::attr::mk_nested_word_item(Ident::new(sym::no_coverage, span));
-    let no_coverage_feature =
-        rustc_ast::attr::mk_list_item(Ident::new(sym::feature, span), vec![no_coverage_ident]);
-    let no_coverage = cx.meta_word(span, sym::no_coverage);
     let hidden = rustc_ast::attr::mk_nested_word_item(Ident::new(sym::hidden, span));
     let doc = rustc_ast::attr::mk_list_item(Ident::new(sym::doc, span), vec![hidden]);
-    let attrs = vec![
-        cx.attribute(inline),
-        cx.attribute(no_coverage_feature),
-        cx.attribute(no_coverage),
-        cx.attribute(doc),
-    ];
+    let no_coverage = cx.meta_word(span, sym::no_coverage);
+    let attrs = vec![cx.attribute(inline), cx.attribute(doc), cx.attribute(no_coverage)];
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),

compiler/rustc_feature/src/builtin_attrs.rs

@@ -273,13 +273,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         template!(List: "address, memory, thread"),
         experimental!(no_sanitize)
     ),
-    ungated!(
-        // Not exclusively gated at the crate level (though crate-level is
-        // supported). The feature can alternatively be enabled on individual
-        // functions.
-        no_coverage, AssumedUsed,
-        template!(Word),
-    ),
+    gated!(no_coverage, AssumedUsed, template!(Word), experimental!(no_coverage)),
 
     // FIXME: #14408 assume docs are used since rustdoc looks at them.
     ungated!(doc, AssumedUsed, template!(List: "hidden|inline|...", NameValueStr: "string")),

compiler/rustc_typeck/src/collect.rs

@@ -2661,8 +2661,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
     let mut inline_span = None;
     let mut link_ordinal_span = None;
     let mut no_sanitize_span = None;
-    let mut no_coverage_feature_enabled = false;
-    let mut no_coverage_attr = None;
     for attr in attrs.iter() {
         if tcx.sess.check_name(attr, sym::cold) {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::COLD;
@@ -2726,15 +2724,8 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::NAKED;
         } else if tcx.sess.check_name(attr, sym::no_mangle) {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_MANGLE;
-        } else if attr.has_name(sym::feature) {
-            if let Some(list) = attr.meta_item_list() {
-                if list.iter().any(|nested_meta_item| nested_meta_item.has_name(sym::no_coverage)) {
-                    tcx.sess.mark_attr_used(attr);
-                    no_coverage_feature_enabled = true;
-                }
-            }
         } else if tcx.sess.check_name(attr, sym::no_coverage) {
-            no_coverage_attr = Some(attr);
+            codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_COVERAGE;
         } else if tcx.sess.check_name(attr, sym::rustc_std_internal_symbol) {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL;
         } else if tcx.sess.check_name(attr, sym::used) {
@@ -2945,23 +2936,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
         }
     }
 
-    if let Some(no_coverage_attr) = no_coverage_attr {
-        if tcx.sess.features_untracked().no_coverage || no_coverage_feature_enabled {
-            codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_COVERAGE
-        } else {
-            let mut err = feature_err(
-                &tcx.sess.parse_sess,
-                sym::no_coverage,
-                no_coverage_attr.span,
-                "the `#[no_coverage]` attribute is an experimental feature",
-            );
-            if tcx.sess.parse_sess.unstable_features.is_nightly_build() {
-                err.help("or, alternatively, add `#[feature(no_coverage)]` to the function");
-            }
-            err.emit();
-        }
-    }
-
     codegen_fn_attrs.inline = attrs.iter().fold(InlineAttr::None, |ia, attr| {
         if !attr.has_name(sym::inline) {
             return ia;

compiler/rustc_typeck/src/collect/type_of.rs

@@ -191,7 +191,25 @@ pub(super) fn opt_const_param_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<
                     Res::Def(DefKind::Ctor(..), def_id) => {
                         tcx.generics_of(tcx.parent(def_id).unwrap())
                     }
-                    Res::Def(_, def_id) => tcx.generics_of(def_id),
+                    // Other `DefKind`s don't have generics and would ICE when calling
+                    // `generics_of`.
+                    Res::Def(
+                        DefKind::Struct
+                        | DefKind::Union
+                        | DefKind::Enum
+                        | DefKind::Variant
+                        | DefKind::Trait
+                        | DefKind::OpaqueTy
+                        | DefKind::TyAlias
+                        | DefKind::ForeignTy
+                        | DefKind::TraitAlias
+                        | DefKind::AssocTy
+                        | DefKind::Fn
+                        | DefKind::AssocFn
+                        | DefKind::AssocConst
+                        | DefKind::Impl,
+                        def_id,
+                    ) => tcx.generics_of(def_id),
                     Res::Err => {
                         tcx.sess.delay_span_bug(tcx.def_span(def_id), "anon const with Res::Err");
                         return None;

library/alloc/benches/vec.rs

@@ -468,7 +468,6 @@ fn bench_in_place_recycle(b: &mut Bencher) {
                 .enumerate()
                 .map(|(idx, e)| idx.wrapping_add(e))
                 .fuse()
-                .peekable()
                 .collect::<Vec<usize>>(),
         );
     });

library/alloc/tests/vec.rs

@@ -1002,7 +1002,6 @@ fn test_from_iter_specialization_with_iterator_adapters() {
         .zip(std::iter::repeat(1usize))
         .map(|(a, b)| a + b)
         .map_while(Option::Some)
-        .peekable()
         .skip(1)
         .map(|e| if e != usize::MAX { Ok(std::num::NonZeroUsize::new(e)) } else { Err(()) });
     assert_in_place_trait(&iter);
@@ -1095,6 +1094,18 @@ fn test_from_iter_specialization_panic_during_drop_leaks() {
     }
 }
 
+// regression test for issue #85322. Peekable previously implemented InPlaceIterable,
+// but due to an interaction with IntoIter's current Clone implementation it failed to uphold
+// the contract.
+#[test]
+fn test_collect_after_iterator_clone() {
+    let v = vec![0; 5];
+    let mut i = v.into_iter().map(|i| i + 1).peekable();
+    i.peek();
+    let v = i.clone().collect::<Vec<_>>();
+    assert_eq!(v, [1, 1, 1, 1, 1]);
+    assert!(v.len() <= v.capacity());
+}
 #[test]
 fn test_cow_from() {
     let borrowed: &[_] = &["borrowed", "(slice)"];

library/core/src/cmp.rs

@@ -274,8 +274,7 @@ pub trait Eq: PartialEq<Self> {
     //
     // This should never be implemented by hand.
     #[doc(hidden)]
-    #[cfg_attr(not(bootstrap), feature(no_coverage))]
-    #[cfg_attr(not(bootstrap), no_coverage)]
+    #[cfg_attr(not(bootstrap), no_coverage)] // rust-lang/rust#84605
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn assert_receiver_is_total_eq(&self) {}
@@ -284,7 +283,7 @@ pub trait Eq: PartialEq<Self> {
 /// Derive macro generating an impl of the trait `Eq`.
 #[rustc_builtin_macro]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
-#[allow_internal_unstable(core_intrinsics, derive_eq, structural_match)]
+#[allow_internal_unstable(core_intrinsics, derive_eq, structural_match, no_coverage)]
 pub macro Eq($item:item) {
     /* compiler built-in */
 }

library/core/src/iter/adapters/peekable.rs

@@ -1,4 +1,4 @@
-use crate::iter::{adapters::SourceIter, FusedIterator, InPlaceIterable, TrustedLen};
+use crate::iter::{adapters::SourceIter, FusedIterator, TrustedLen};
 use crate::ops::Try;
 
 /// An iterator with a `peek()` that returns an optional reference to the next
@@ -333,6 +333,3 @@ where
         unsafe { SourceIter::as_inner(&mut self.iter) }
     }
 }
-
-#[unstable(issue = "none", feature = "inplace_iteration")]
-unsafe impl<I: InPlaceIterable> InPlaceIterable for Peekable<I> {}

library/core/src/lib.rs

@@ -166,6 +166,7 @@
 #![feature(const_caller_location)]
 #![feature(slice_ptr_get)]
 #![feature(no_niche)] // rust-lang/rust#68303
+#![cfg_attr(not(bootstrap), feature(no_coverage))] // rust-lang/rust#84605
 #![feature(int_error_matching)]
 #![deny(unsafe_op_in_unsafe_fn)]