Auto merge of #103739 - Mark-Simulacrum:beta-next, r=Mark-Simulacrum

[beta] backport rollup

* poll_fn and Unpin: fix pinning #102737
* Support raw-dylib functions being used inside inlined functions #102988
* Fix line numbers for MIR inlined code #103071
* Add architectures to fn create_object_file #103240
* Add eval hack in super_relate_consts back #103279
* Mark std::os::wasi::io::AsFd etc. as stable. #103308
* Truncate thread names on Linux and Apple targets #103379
* Do not consider repeated lifetime params for elision. #103450
* rustdoc: add missing URL redirect #103588
* Remove commit_if_ok probe from NLL type relation #103601

Also includes a copy of the release notes.

r? `@ghost`

14 files changed, 157 insertions, 49 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/archive.rs b/compiler/rustc_codegen_cranelift/src/archive.rs
index b4c79096170..fb5313f17f3 100644
--- a/compiler/rustc_codegen_cranelift/src/archive.rs
+++ b/compiler/rustc_codegen_cranelift/src/archive.rs
@@ -38,6 +38,7 @@ impl ArchiveBuilderBuilder for ArArchiveBuilderBuilder {
         _lib_name: &str,
         _dll_imports: &[rustc_session::cstore::DllImport],
         _tmpdir: &Path,
+        _is_direct_dependency: bool,
     ) -> PathBuf {
         bug!("creating dll imports is not supported");
     }
diff --git a/compiler/rustc_codegen_gcc/src/archive.rs b/compiler/rustc_codegen_gcc/src/archive.rs
index f863abdcc97..96c77310160 100644
--- a/compiler/rustc_codegen_gcc/src/archive.rs
+++ b/compiler/rustc_codegen_gcc/src/archive.rs
@@ -45,6 +45,7 @@ impl ArchiveBuilderBuilder for ArArchiveBuilderBuilder {
         _lib_name: &str,
         _dll_imports: &[DllImport],
         _tmpdir: &Path,
+        _is_direct_dependency: bool,
     ) -> PathBuf {
         unimplemented!();
     }
diff --git a/compiler/rustc_codegen_llvm/src/back/archive.rs b/compiler/rustc_codegen_llvm/src/back/archive.rs
index 38a366095b4..ed96355a052 100644
--- a/compiler/rustc_codegen_llvm/src/back/archive.rs
+++ b/compiler/rustc_codegen_llvm/src/back/archive.rs
@@ -104,10 +104,12 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
         lib_name: &str,
         dll_imports: &[DllImport],
         tmpdir: &Path,
+        is_direct_dependency: bool,
     ) -> PathBuf {
+        let name_suffix = if is_direct_dependency { "_imports" } else { "_imports_indirect" };
         let output_path = {
             let mut output_path: PathBuf = tmpdir.to_path_buf();
-            output_path.push(format!("{}_imports", lib_name));
+            output_path.push(format!("{}{}", lib_name, name_suffix));
             output_path.with_extension("lib")
         };
 
@@ -134,7 +136,8 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
             // that loaded but crashed with an AV upon calling one of the imported
             // functions.  Therefore, use binutils to create the import library instead,
             // by writing a .DEF file to the temp dir and calling binutils's dlltool.
-            let def_file_path = tmpdir.join(format!("{}_imports", lib_name)).with_extension("def");
+            let def_file_path =
+                tmpdir.join(format!("{}{}", lib_name, name_suffix)).with_extension("def");
 
             let def_file_content = format!(
                 "EXPORTS\n{}",
diff --git a/compiler/rustc_codegen_ssa/src/back/archive.rs b/compiler/rustc_codegen_ssa/src/back/archive.rs
index bad58d0a8a0..bb76ca5d2b9 100644
--- a/compiler/rustc_codegen_ssa/src/back/archive.rs
+++ b/compiler/rustc_codegen_ssa/src/back/archive.rs
@@ -25,6 +25,7 @@ pub trait ArchiveBuilderBuilder {
         lib_name: &str,
         dll_imports: &[DllImport],
         tmpdir: &Path,
+        is_direct_dependency: bool,
     ) -> PathBuf;
 
     fn extract_bundled_libs(
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index ea0f0de76c5..6cce9542746 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -376,13 +376,14 @@ fn link_rlib<'a>(
     }
 
     for (raw_dylib_name, raw_dylib_imports) in
-        collate_raw_dylibs(sess, &codegen_results.crate_info.used_libraries)?
+        collate_raw_dylibs(sess, codegen_results.crate_info.used_libraries.iter())?
     {
         let output_path = archive_builder_builder.create_dll_import_lib(
             sess,
             &raw_dylib_name,
             &raw_dylib_imports,
             tmpdir.as_ref(),
+            true,
         );
 
         ab.add_archive(&output_path, Box::new(|_| false)).unwrap_or_else(|e| {
@@ -434,9 +435,9 @@ fn link_rlib<'a>(
 /// then the CodegenResults value contains one NativeLib instance for each block.  However, the
 /// linker appears to expect only a single import library for each library used, so we need to
 /// collate the symbols together by library name before generating the import libraries.
-fn collate_raw_dylibs(
-    sess: &Session,
-    used_libraries: &[NativeLib],
+fn collate_raw_dylibs<'a, 'b>(
+    sess: &'a Session,
+    used_libraries: impl IntoIterator<Item = &'b NativeLib>,
 ) -> Result<Vec<(String, Vec<DllImport>)>, ErrorGuaranteed> {
     // Use index maps to preserve original order of imports and libraries.
     let mut dylib_table = FxIndexMap::<String, FxIndexMap<Symbol, &DllImport>>::default();
@@ -2028,13 +2029,43 @@ fn linker_with_args<'a>(
 
     // Link with the import library generated for any raw-dylib functions.
     for (raw_dylib_name, raw_dylib_imports) in
-        collate_raw_dylibs(sess, &codegen_results.crate_info.used_libraries)?
+        collate_raw_dylibs(sess, codegen_results.crate_info.used_libraries.iter())?
+    {
+        cmd.add_object(&archive_builder_builder.create_dll_import_lib(
+            sess,
+            &raw_dylib_name,
+            &raw_dylib_imports,
+            tmpdir,
+            true,
+        ));
+    }
+    // As with add_upstream_native_libraries, we need to add the upstream raw-dylib symbols in case
+    // they are used within inlined functions or instantiated generic functions. We do this *after*
+    // handling the raw-dylib symbols in the current crate to make sure that those are chosen first
+    // by the linker.
+    let (_, dependency_linkage) = codegen_results
+        .crate_info
+        .dependency_formats
+        .iter()
+        .find(|(ty, _)| *ty == crate_type)
+        .expect("failed to find crate type in dependency format list");
+    let native_libraries_from_nonstatics = codegen_results
+        .crate_info
+        .native_libraries
+        .iter()
+        .filter_map(|(cnum, libraries)| {
+            (dependency_linkage[cnum.as_usize() - 1] != Linkage::Static).then(|| libraries)
+        })
+        .flatten();
+    for (raw_dylib_name, raw_dylib_imports) in
+        collate_raw_dylibs(sess, native_libraries_from_nonstatics)?
     {
         cmd.add_object(&archive_builder_builder.create_dll_import_lib(
             sess,
             &raw_dylib_name,
             &raw_dylib_imports,
             tmpdir,
+            false,
         ));
     }
 
diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs
index b92e146bee2..99ddd176478 100644
--- a/compiler/rustc_codegen_ssa/src/back/metadata.rs
+++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs
@@ -117,6 +117,10 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
         "riscv32" => Architecture::Riscv32,
         "riscv64" => Architecture::Riscv64,
         "sparc64" => Architecture::Sparc64,
+        "avr" => Architecture::Avr,
+        "msp430" => Architecture::Msp430,
+        "hexagon" => Architecture::Hexagon,
+        "bpf" => Architecture::Bpf,
         // Unsupported architecture.
         _ => return None,
     };
diff --git a/compiler/rustc_const_eval/src/interpret/operand.rs b/compiler/rustc_const_eval/src/interpret/operand.rs
index 29c745a0886..0e3959b61a1 100644
--- a/compiler/rustc_const_eval/src/interpret/operand.rs
+++ b/compiler/rustc_const_eval/src/interpret/operand.rs
@@ -591,9 +591,16 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         val: &mir::ConstantKind<'tcx>,
         layout: Option<TyAndLayout<'tcx>>,
     ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>> {
+        // FIXME(const_prop): normalization needed b/c const prop lint in
+        // `mir_drops_elaborated_and_const_checked`, which happens before
+        // optimized MIR. Only after optimizing the MIR can we guarantee
+        // that the `RevealAll` pass has happened and that the body's consts
+        // are normalized, so any call to resolve before that needs to be
+        // manually normalized.
+        let val = self.tcx.normalize_erasing_regions(self.param_env, *val);
         match val {
-            mir::ConstantKind::Ty(ct) => self.const_to_op(*ct, layout),
-            mir::ConstantKind::Val(val, ty) => self.const_val_to_op(*val, *ty, layout),
+            mir::ConstantKind::Ty(ct) => self.const_to_op(ct, layout),
+            mir::ConstantKind::Val(val, ty) => self.const_val_to_op(val, ty, layout),
             mir::ConstantKind::Unevaluated(uv, _) => {
                 let instance = self.resolve(uv.def, uv.substs)?;
                 Ok(self.eval_to_allocation(GlobalId { instance, promoted: uv.promoted })?.into())
diff --git a/compiler/rustc_infer/src/infer/nll_relate/mod.rs b/compiler/rustc_infer/src/infer/nll_relate/mod.rs
index bb6f6ae60e2..00fc442d3b0 100644
--- a/compiler/rustc_infer/src/infer/nll_relate/mod.rs
+++ b/compiler/rustc_infer/src/infer/nll_relate/mod.rs
@@ -596,7 +596,7 @@ where
             (&ty::Infer(ty::TyVar(vid)), _) => self.relate_ty_var((vid, b)),
 
             (&ty::Opaque(a_def_id, _), &ty::Opaque(b_def_id, _)) if a_def_id == b_def_id => {
-                infcx.commit_if_ok(|_| infcx.super_combine_tys(self, a, b)).or_else(|err| {
+                infcx.super_combine_tys(self, a, b).or_else(|err| {
                     self.tcx().sess.delay_span_bug(
                         self.delegate.span(),
                         "failure to relate an opaque to itself should result in an error later on",
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index e8fe37e7dab..3f987119099 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -2489,7 +2489,9 @@ impl<'tcx> TyCtxt<'tcx> {
             && if self.features().collapse_debuginfo {
                 span.in_macro_expansion_with_collapse_debuginfo()
             } else {
-                span.from_expansion()
+                // Inlined spans should not be collapsed as that leads to all of the
+                // inlined code being attributed to the inline callsite.
+                span.from_expansion() && !span.is_inlined()
             }
     }
 
diff --git a/compiler/rustc_middle/src/ty/relate.rs b/compiler/rustc_middle/src/ty/relate.rs
index af31f54981f..61c34730d59 100644
--- a/compiler/rustc_middle/src/ty/relate.rs
+++ b/compiler/rustc_middle/src/ty/relate.rs
@@ -574,8 +574,8 @@ pub fn super_relate_tys<'tcx, R: TypeRelation<'tcx>>(
 /// it.
 pub fn super_relate_consts<'tcx, R: TypeRelation<'tcx>>(
     relation: &mut R,
-    a: ty::Const<'tcx>,
-    b: ty::Const<'tcx>,
+    mut a: ty::Const<'tcx>,
+    mut b: ty::Const<'tcx>,
 ) -> RelateResult<'tcx, ty::Const<'tcx>> {
     debug!("{}.super_relate_consts(a = {:?}, b = {:?})", relation.tag(), a, b);
     let tcx = relation.tcx();
@@ -596,6 +596,17 @@ pub fn super_relate_consts<'tcx, R: TypeRelation<'tcx>>(
         );
     }
 
+    // HACK(const_generics): We still need to eagerly evaluate consts when
+    // relating them because during `normalize_param_env_or_error`,
+    // we may relate an evaluated constant in a obligation against
+    // an unnormalized (i.e. unevaluated) const in the param-env.
+    // FIXME(generic_const_exprs): Once we always lazily unify unevaluated constants
+    // these `eval` calls can be removed.
+    if !relation.tcx().features().generic_const_exprs {
+        a = a.eval(tcx, relation.param_env());
+        b = b.eval(tcx, relation.param_env());
+    }
+
     // Currently, the values that can be unified are primitive types,
     // and those that derive both `PartialEq` and `Eq`, corresponding
     // to structural-match types.
diff --git a/compiler/rustc_mir_build/src/thir/pattern/mod.rs b/compiler/rustc_mir_build/src/thir/pattern/mod.rs
index e712741b7c9..0edf6a98327 100644
--- a/compiler/rustc_mir_build/src/thir/pattern/mod.rs
+++ b/compiler/rustc_mir_build/src/thir/pattern/mod.rs
@@ -481,7 +481,12 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
         // Use `Reveal::All` here because patterns are always monomorphic even if their function
         // isn't.
         let param_env_reveal_all = self.param_env.with_reveal_all_normalized(self.tcx);
-        let substs = self.typeck_results.node_substs(id);
+        // N.B. There is no guarantee that substs collected in typeck results are fully normalized,
+        // so they need to be normalized in order to pass to `Instance::resolve`, which will ICE
+        // if given unnormalized types.
+        let substs = self
+            .tcx
+            .normalize_erasing_regions(param_env_reveal_all, self.typeck_results.node_substs(id));
         let instance = match ty::Instance::resolve(self.tcx, param_env_reveal_all, def_id, substs) {
             Ok(Some(i)) => i,
             Ok(None) => {
diff --git a/compiler/rustc_resolve/src/late.rs b/compiler/rustc_resolve/src/late.rs
index d2a0d826b52..d8d82e125d5 100644
--- a/compiler/rustc_resolve/src/late.rs
+++ b/compiler/rustc_resolve/src/late.rs
@@ -30,6 +30,7 @@ use rustc_span::{BytePos, Span};
 use smallvec::{smallvec, SmallVec};
 
 use rustc_span::source_map::{respan, Spanned};
+use std::assert_matches::debug_assert_matches;
 use std::collections::{hash_map::Entry, BTreeSet};
 use std::mem::{replace, take};
 
@@ -557,7 +558,7 @@ struct LateResolutionVisitor<'a, 'b, 'ast> {
     /// They will be used to determine the correct lifetime for the fn return type.
     /// The `LifetimeElisionCandidate` is used for diagnostics, to suggest introducing named
     /// lifetimes.
-    lifetime_elision_candidates: Option<FxIndexMap<LifetimeRes, LifetimeElisionCandidate>>,
+    lifetime_elision_candidates: Option<Vec<(LifetimeRes, LifetimeElisionCandidate)>>,
 
     /// The trait that the current context can refer to.
     current_trait_ref: Option<(Module<'a>, TraitRef)>,
@@ -1819,7 +1820,7 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
         match res {
             LifetimeRes::Param { .. } | LifetimeRes::Fresh { .. } | LifetimeRes::Static => {
                 if let Some(ref mut candidates) = self.lifetime_elision_candidates {
-                    candidates.insert(res, candidate);
+                    candidates.push((res, candidate));
                 }
             }
             LifetimeRes::Infer | LifetimeRes::Error | LifetimeRes::ElidedAnchor { .. } => {}
@@ -1872,12 +1873,25 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
         has_self: bool,
         inputs: impl Iterator<Item = (Option<&'ast Pat>, &'ast Ty)>,
     ) -> Result<LifetimeRes, (Vec<MissingLifetime>, Vec<ElisionFnParameter>)> {
-        let outer_candidates =
-            replace(&mut self.lifetime_elision_candidates, Some(Default::default()));
+        enum Elision {
+            /// We have not found any candidate.
+            None,
+            /// We have a candidate bound to `self`.
+            Self_(LifetimeRes),
+            /// We have a candidate bound to a parameter.
+            Param(LifetimeRes),
+            /// We failed elision.
+            Err,
+        }
 
-        let mut elision_lifetime = None;
-        let mut lifetime_count = 0;
+        // Save elision state to reinstate it later.
+        let outer_candidates = self.lifetime_elision_candidates.take();
+
+        // Result of elision.
+        let mut elision_lifetime = Elision::None;
+        // Information for diagnostics.
         let mut parameter_info = Vec::new();
+        let mut all_candidates = Vec::new();
 
         let mut bindings = smallvec![(PatBoundCtx::Product, Default::default())];
         for (index, (pat, ty)) in inputs.enumerate() {
@@ -1885,12 +1899,17 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
             if let Some(pat) = pat {
                 self.resolve_pattern(pat, PatternSource::FnParam, &mut bindings);
             }
+
+            // Record elision candidates only for this parameter.
+            debug_assert_matches!(self.lifetime_elision_candidates, None);
+            self.lifetime_elision_candidates = Some(Default::default());
             self.visit_ty(ty);
+            let local_candidates = self.lifetime_elision_candidates.take();
 
-            if let Some(ref candidates) = self.lifetime_elision_candidates {
-                let new_count = candidates.len();
-                let local_count = new_count - lifetime_count;
-                if local_count != 0 {
+            if let Some(candidates) = local_candidates {
+                let distinct: FxHashSet<_> = candidates.iter().map(|(res, _)| *res).collect();
+                let lifetime_count = distinct.len();
+                if lifetime_count != 0 {
                     parameter_info.push(ElisionFnParameter {
                         index,
                         ident: if let Some(pat) = pat && let PatKind::Ident(_, ident, _) = pat.kind {
@@ -1898,48 +1917,64 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
                         } else {
                             None
                         },
-                        lifetime_count: local_count,
+                        lifetime_count,
                         span: ty.span,
                     });
+                    all_candidates.extend(candidates.into_iter().filter_map(|(_, candidate)| {
+                        match candidate {
+                            LifetimeElisionCandidate::Ignore | LifetimeElisionCandidate::Named => {
+                                None
+                            }
+                            LifetimeElisionCandidate::Missing(missing) => Some(missing),
+                        }
+                    }));
+                }
+                let mut distinct_iter = distinct.into_iter();
+                if let Some(res) = distinct_iter.next() {
+                    match elision_lifetime {
+                        // We are the first parameter to bind lifetimes.
+                        Elision::None => {
+                            if distinct_iter.next().is_none() {
+                                // We have a single lifetime => success.
+                                elision_lifetime = Elision::Param(res)
+                            } else {
+                                // We have have multiple lifetimes => error.
+                                elision_lifetime = Elision::Err;
+                            }
+                        }
+                        // We have 2 parameters that bind lifetimes => error.
+                        Elision::Param(_) => elision_lifetime = Elision::Err,
+                        // `self` elision takes precedence over everything else.
+                        Elision::Self_(_) | Elision::Err => {}
+                    }
                 }
-                lifetime_count = new_count;
             }
 
             // Handle `self` specially.
             if index == 0 && has_self {
                 let self_lifetime = self.find_lifetime_for_self(ty);
                 if let Set1::One(lifetime) = self_lifetime {
-                    elision_lifetime = Some(lifetime);
-                    self.lifetime_elision_candidates = None;
+                    // We found `self` elision.
+                    elision_lifetime = Elision::Self_(lifetime);
                 } else {
-                    self.lifetime_elision_candidates = Some(Default::default());
-                    lifetime_count = 0;
+                    // We do not have `self` elision: disregard the `Elision::Param` that we may
+                    // have found.
+                    elision_lifetime = Elision::None;
                 }
             }
             debug!("(resolving function / closure) recorded parameter");
         }
 
-        let all_candidates = replace(&mut self.lifetime_elision_candidates, outer_candidates);
-        debug!(?all_candidates);
+        // Reinstate elision state.
+        debug_assert_matches!(self.lifetime_elision_candidates, None);
+        self.lifetime_elision_candidates = outer_candidates;
 
-        if let Some(res) = elision_lifetime {
+        if let Elision::Param(res) | Elision::Self_(res) = elision_lifetime {
             return Ok(res);
         }
 
-        // We do not have a `self` candidate, look at the full list.
-        let all_candidates = all_candidates.unwrap();
-        if all_candidates.len() == 1 {
-            Ok(*all_candidates.first().unwrap().0)
-        } else {
-            let all_candidates = all_candidates
-                .into_iter()
-                .filter_map(|(_, candidate)| match candidate {
-                    LifetimeElisionCandidate::Ignore | LifetimeElisionCandidate::Named => None,
-                    LifetimeElisionCandidate::Missing(missing) => Some(missing),
-                })
-                .collect();
-            Err((all_candidates, parameter_info))
-        }
+        // We do not have a candidate.
+        Err((all_candidates, parameter_info))
     }
 
     /// List all the lifetimes that appear in the provided type.
@@ -2411,7 +2446,7 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
         // Do not account for the parameters we just bound for function lifetime elision.
         if let Some(ref mut candidates) = self.lifetime_elision_candidates {
             for (_, res) in function_lifetime_rib.bindings.values() {
-                candidates.remove(res);
+                candidates.retain(|(r, _)| r != res);
             }
         }
 
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 54a7f416ce6..26b9284fe91 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -7,6 +7,7 @@
 //! Type-relative name resolution (methods, fields, associated items) happens in `rustc_typeck`.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(drain_filter)]
 #![feature(if_let_guard)]
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index ada3bae6150..da31b346293 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -558,7 +558,7 @@ impl Span {
         self.data_untracked().is_dummy()
     }
 
-    /// Returns `true` if this span comes from a macro or desugaring.
+    /// Returns `true` if this span comes from any kind of macro, desugaring or inlining.
     #[inline]
     pub fn from_expansion(self) -> bool {
         self.ctxt() != SyntaxContext::root()
@@ -571,6 +571,12 @@ impl Span {
         matches!(outer_expn.kind, ExpnKind::Macro(..)) && outer_expn.collapse_debuginfo
     }
 
+    /// Returns `true` if this span comes from MIR inlining.
+    pub fn is_inlined(self) -> bool {
+        let outer_expn = self.ctxt().outer_expn_data();
+        matches!(outer_expn.kind, ExpnKind::Inlined)
+    }
+
     /// Returns `true` if `span` originates in a derive-macro's expansion.
     pub fn in_derive_expansion(self) -> bool {
         matches!(self.ctxt().outer_expn_data().kind, ExpnKind::Macro(MacroKind::Derive, _))