Auto merge of #80960 - Dylan-DPC:rollup-89tri8x, r=Dylan-DPC

Rollup of 10 pull requests

Successful merges:

 - #78901 (diagnostics: Note capturing closures can't be coerced to fns)
 - #79588 (Provide more information for HRTB lifetime errors involving closures)
 - #80232 (Remove redundant def_id lookups)
 - #80662 (Added support for i386-unknown-linux-gnu and i486-unknown-linux-gnu)
 - #80736 (use Once instead of Mutex to manage capture resolution)
 - #80796 (Update to LLVM 11.0.1)
 - #80859 (Fix --pretty=expanded with --remap-path-prefix)
 - #80922 (Revert "Auto merge of #76896 - spastorino:codegen-inline-fns2)
 - #80924 (Fix rustdoc --test-builder argument parsing)
 - #80935 (Rename `rustc_middle::lint::LevelSource` to `LevelAndSource`)

Failed merges:

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

compiler/rustc_middle/src/lint.rs

@@ -46,7 +46,7 @@ impl LintLevelSource {
 }
 
 /// A tuple of a lint level and its source.
-pub type LevelSource = (Level, LintLevelSource);
+pub type LevelAndSource = (Level, LintLevelSource);
 
 pub struct LintLevelSets {
     pub list: Vec<LintSet>,
@@ -57,11 +57,11 @@ pub enum LintSet {
     CommandLine {
         // -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which
         // flag.
-        specs: FxHashMap<LintId, LevelSource>,
+        specs: FxHashMap<LintId, LevelAndSource>,
     },
 
     Node {
-        specs: FxHashMap<LintId, LevelSource>,
+        specs: FxHashMap<LintId, LevelAndSource>,
         parent: u32,
     },
 }
@@ -75,9 +75,9 @@ impl LintLevelSets {
         &self,
         lint: &'static Lint,
         idx: u32,
-        aux: Option<&FxHashMap<LintId, LevelSource>>,
+        aux: Option<&FxHashMap<LintId, LevelAndSource>>,
         sess: &Session,
-    ) -> LevelSource {
+    ) -> LevelAndSource {
         let (level, mut src) = self.get_lint_id_level(LintId::of(lint), idx, aux);
 
         // If `level` is none then we actually assume the default level for this
@@ -113,7 +113,7 @@ impl LintLevelSets {
         &self,
         id: LintId,
         mut idx: u32,
-        aux: Option<&FxHashMap<LintId, LevelSource>>,
+        aux: Option<&FxHashMap<LintId, LevelAndSource>>,
     ) -> (Option<Level>, LintLevelSource) {
         if let Some(specs) = aux {
             if let Some(&(level, src)) = specs.get(&id) {
@@ -157,7 +157,7 @@ impl LintLevelMap {
         lint: &'static Lint,
         id: HirId,
         session: &Session,
-    ) -> Option<LevelSource> {
+    ) -> Option<LevelAndSource> {
         self.id_to_set.get(&id).map(|idx| self.sets.get_lint_level(lint, *idx, None, session))
     }
 }

compiler/rustc_middle/src/mir/mono.rs

@@ -1,6 +1,7 @@
 use crate::dep_graph::{dep_constructor, DepNode, WorkProduct, WorkProductId};
 use crate::ich::{NodeIdHashingMode, StableHashingContext};
 use crate::ty::{subst::InternalSubsts, Instance, InstanceDef, SymbolName, TyCtxt};
+use rustc_attr::InlineAttr;
 use rustc_data_structures::base_n;
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
@@ -78,6 +79,14 @@ impl<'tcx> MonoItem<'tcx> {
     }
 
     pub fn instantiation_mode(&self, tcx: TyCtxt<'tcx>) -> InstantiationMode {
+        let generate_cgu_internal_copies = tcx
+            .sess
+            .opts
+            .debugging_opts
+            .inline_in_all_cgus
+            .unwrap_or_else(|| tcx.sess.opts.optimize != OptLevel::No)
+            && !tcx.sess.link_dead_code();
+
         match *self {
             MonoItem::Fn(ref instance) => {
                 let entry_def_id = tcx.entry_fn(LOCAL_CRATE).map(|(id, _)| id);
@@ -90,26 +99,21 @@ impl<'tcx> MonoItem<'tcx> {
                     return InstantiationMode::GloballyShared { may_conflict: false };
                 }
 
-                let generate_cgu_internal_copies = tcx
-                    .sess
-                    .opts
-                    .debugging_opts
-                    .inline_in_all_cgus
-                    .unwrap_or_else(|| tcx.sess.opts.optimize != OptLevel::No)
-                    && !tcx.sess.link_dead_code();
-
                 // At this point we don't have explicit linkage and we're an
-                // inlined function. If we should generate local copies for each CGU,
-                // then return `LocalCopy`, otherwise we'll just generate one copy
-                // and share it with all CGUs in this crate.
+                // inlined function. If we're inlining into all CGUs then we'll
+                // be creating a local copy per CGU.
                 if generate_cgu_internal_copies {
-                    InstantiationMode::LocalCopy
-                } else {
-                    // Finally, if we've reached this point, then we should optimize for
-                    // compilation speed. In that regard, we will ignore any `#[inline]`
-                    // annotations on the function and simply codegen it as usual. This could
-                    // conflict with upstream crates as it could be an exported symbol.
-                    InstantiationMode::GloballyShared { may_conflict: true }
+                    return InstantiationMode::LocalCopy;
+                }
+
+                // Finally, if this is `#[inline(always)]` we're sure to respect
+                // that with an inline copy per CGU, but otherwise we'll be
+                // creating one copy of this `#[inline]` function which may
+                // conflict with upstream crates as it could be an exported
+                // symbol.
+                match tcx.codegen_fn_attrs(instance.def_id()).inline {
+                    InlineAttr::Always => InstantiationMode::LocalCopy,
+                    _ => InstantiationMode::GloballyShared { may_conflict: true },
                 }
             }
             MonoItem::Static(..) | MonoItem::GlobalAsm(..) => {

compiler/rustc_middle/src/ty/consts.rs

@@ -92,8 +92,7 @@ impl<'tcx> Const<'tcx> {
                 let item_id = tcx.hir().get_parent_node(hir_id);
                 let item_def_id = tcx.hir().local_def_id(item_id);
                 let generics = tcx.generics_of(item_def_id.to_def_id());
-                let index =
-                    generics.param_def_id_to_index[&tcx.hir().local_def_id(hir_id).to_def_id()];
+                let index = generics.param_def_id_to_index[&def_id];
                 let name = tcx.hir().name(hir_id);
                 ty::ConstKind::Param(ty::ParamConst::new(index, name))
             }