Auto merge of #126023 - amandasystems:you-dropped-this-again, r=nikomatsakis

Remove confusing `use_polonius` flag and do less cloning

The `use_polonius` flag is both redundant and confusing since every function it's propagated to also checks if `all_facts` is `Some`, the true test of whether to generate Polonius facts for Polonius or for external consumers. This PR makes that path clearer by simply doing away with the argument and handling the logic in precisely two places: where facts are populated (check for `Some`), and where `all_facts` are initialised. It also delays some statements until after that check to avoid the miniscule performance penalty of executing them when Polonius is disabled.

This also addresses `@lqd's` concern in #125652 by reducing the size of what is cloned out of Polonius facts to just the facts being added, as opposed to the entire vector of potential inputs, and added descriptive comments.

*Reviewer note*: the comments in `add_extra_drop_facts` should be inspected by a reviewer, in particular the one on [L#259](https://github.com/rust-lang/rust/compare/master...amandasystems:you-dropped-this-again?expand=1#diff-aa727290e6670264df2face84f012897878e11a70e9c8b156543cfcd9619bac3R259) in this PR, which should be trivial for someone with the right background knowledge to address.

I also included some lints I found on the way there that I couldn't help myself from addressing.

13 files changed, 57 insertions, 51 deletions

diff --git a/compiler/rustc_borrowck/src/borrow_set.rs b/compiler/rustc_borrowck/src/borrow_set.rs
index 3e6d0311b27..0bae1bd07a2 100644
--- a/compiler/rustc_borrowck/src/borrow_set.rs
+++ b/compiler/rustc_borrowck/src/borrow_set.rs
@@ -126,7 +126,7 @@ impl<'tcx> BorrowSet<'tcx> {
     ) -> Self {
         let mut visitor = GatherBorrows {
             tcx,
-            body: body,
+            body,
             location_map: Default::default(),
             activation_map: Default::default(),
             local_map: Default::default(),
diff --git a/compiler/rustc_borrowck/src/borrowck_errors.rs b/compiler/rustc_borrowck/src/borrowck_errors.rs
index c1f75328272..8a2936c2657 100644
--- a/compiler/rustc_borrowck/src/borrowck_errors.rs
+++ b/compiler/rustc_borrowck/src/borrowck_errors.rs
@@ -213,7 +213,7 @@ impl<'cx, 'tcx> crate::MirBorrowckCtxt<'cx, 'tcx> {
             via(msg_old),
         );
 
-        if msg_new == "" {
+        if msg_new.is_empty() {
             // If `msg_new` is empty, then this isn't a borrow of a union field.
             err.span_label(span, format!("{kind_new} borrow occurs here"));
             err.span_label(old_span, format!("{kind_old} borrow occurs here"));
diff --git a/compiler/rustc_borrowck/src/dataflow.rs b/compiler/rustc_borrowck/src/dataflow.rs
index ec7d4582a60..f2b5ddcd782 100644
--- a/compiler/rustc_borrowck/src/dataflow.rs
+++ b/compiler/rustc_borrowck/src/dataflow.rs
@@ -43,9 +43,9 @@ impl<'mir, 'tcx> ResultsVisitable<'tcx> for BorrowckResults<'mir, 'tcx> {
     }
 
     fn reset_to_block_entry(&self, state: &mut Self::FlowState, block: BasicBlock) {
-        state.borrows.clone_from(&self.borrows.entry_set_for_block(block));
-        state.uninits.clone_from(&self.uninits.entry_set_for_block(block));
-        state.ever_inits.clone_from(&self.ever_inits.entry_set_for_block(block));
+        state.borrows.clone_from(self.borrows.entry_set_for_block(block));
+        state.uninits.clone_from(self.uninits.entry_set_for_block(block));
+        state.ever_inits.clone_from(self.ever_inits.entry_set_for_block(block));
     }
 
     fn reconstruct_before_statement_effect(
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
index 67c11ff4a5b..c214c52880a 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
@@ -895,7 +895,6 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
             for alias_ty in alias_tys {
                 if alias_ty.span.desugaring_kind().is_some() {
                     // Skip `async` desugaring `impl Future`.
-                    ()
                 }
                 if let TyKind::TraitObject(_, lt, _) = alias_ty.kind {
                     if lt.ident.name == kw::Empty {
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_name.rs b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
index 77fb9fb4315..25a0d40218b 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_name.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
@@ -519,7 +519,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                     }
 
                     // Otherwise, let's descend into the referent types.
-                    search_stack.push((*referent_ty, &referent_hir_ty.ty));
+                    search_stack.push((*referent_ty, referent_hir_ty.ty));
                 }
 
                 // Match up something like `Foo<'1>`
@@ -558,7 +558,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                 }
 
                 (ty::RawPtr(mut_ty, _), hir::TyKind::Ptr(mut_hir_ty)) => {
-                    search_stack.push((*mut_ty, &mut_hir_ty.ty));
+                    search_stack.push((*mut_ty, mut_hir_ty.ty));
                 }
 
                 _ => {
@@ -652,7 +652,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
         let upvar_index = self.regioncx.get_upvar_index_for_region(self.infcx.tcx, fr)?;
         let (upvar_name, upvar_span) = self.regioncx.get_upvar_name_and_span_for_region(
             self.infcx.tcx,
-            &self.upvars,
+            self.upvars,
             upvar_index,
         );
         let region_name = self.synthesize_region_name();
@@ -717,7 +717,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                             .output;
                         span = output.span();
                         if let hir::FnRetTy::Return(ret) = output {
-                            hir_ty = Some(self.get_future_inner_return_ty(*ret));
+                            hir_ty = Some(self.get_future_inner_return_ty(ret));
                         }
                         " of async function"
                     }
@@ -958,7 +958,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
         {
             let (upvar_name, upvar_span) = self.regioncx.get_upvar_name_and_span_for_region(
                 self.infcx.tcx,
-                &self.upvars,
+                self.upvars,
                 upvar_index,
             );
             let region_name = self.synthesize_region_name();
diff --git a/compiler/rustc_borrowck/src/nll.rs b/compiler/rustc_borrowck/src/nll.rs
index 5d7ce548469..923cf7e9405 100644
--- a/compiler/rustc_borrowck/src/nll.rs
+++ b/compiler/rustc_borrowck/src/nll.rs
@@ -114,7 +114,6 @@ pub(crate) fn compute_regions<'cx, 'tcx>(
             move_data,
             elements,
             upvars,
-            polonius_input,
         );
 
     // Create the region inference context, taking ownership of the
diff --git a/compiler/rustc_borrowck/src/polonius/mod.rs b/compiler/rustc_borrowck/src/polonius/mod.rs
index 9984f76e6d4..c590104978c 100644
--- a/compiler/rustc_borrowck/src/polonius/mod.rs
+++ b/compiler/rustc_borrowck/src/polonius/mod.rs
@@ -43,8 +43,8 @@ pub(crate) fn emit_facts<'tcx>(
     emit_universal_region_facts(
         all_facts,
         borrow_set,
-        &universal_regions,
-        &universal_region_relations,
+        universal_regions,
+        universal_region_relations,
     );
     emit_cfg_and_loan_kills_facts(all_facts, tcx, location_table, body, borrow_set);
     emit_loan_invalidations_facts(all_facts, tcx, location_table, body, borrow_set);
diff --git a/compiler/rustc_borrowck/src/region_infer/mod.rs b/compiler/rustc_borrowck/src/region_infer/mod.rs
index bf1c1b1433e..c56eaaff076 100644
--- a/compiler/rustc_borrowck/src/region_infer/mod.rs
+++ b/compiler/rustc_borrowck/src/region_infer/mod.rs
@@ -344,7 +344,7 @@ fn sccs_info<'tcx>(infcx: &BorrowckInferCtxt<'tcx>, sccs: &ConstraintSccs) {
 
     for (reg_var_idx, scc_idx) in sccs.scc_indices().iter().enumerate() {
         let reg_var = ty::RegionVid::from_usize(reg_var_idx);
-        let origin = var_to_origin.get(&reg_var).unwrap_or_else(|| &RegionCtxt::Unknown);
+        let origin = var_to_origin.get(&reg_var).unwrap_or(&RegionCtxt::Unknown);
         components[scc_idx.as_usize()].insert((reg_var, *origin));
     }
 
@@ -2216,7 +2216,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         // #114907 where this happens via liveness and dropck outlives results.
         // Therefore, we return a default value in case that happens, which should at worst emit a
         // suboptimal error, instead of the ICE.
-        self.universe_causes.get(&universe).cloned().unwrap_or_else(|| UniverseInfo::other())
+        self.universe_causes.get(&universe).cloned().unwrap_or_else(UniverseInfo::other)
     }
 
     /// Tries to find the terminator of the loop in which the region 'r' resides.
diff --git a/compiler/rustc_borrowck/src/region_infer/opaque_types.rs b/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
index 51c3648d730..67e5c8352df 100644
--- a/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
+++ b/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
@@ -418,9 +418,7 @@ fn check_opaque_type_parameter_valid<'tcx>(
             let opaque_param = opaque_generics.param_at(i, tcx);
             let kind = opaque_param.kind.descr();
 
-            if let Err(guar) = opaque_env.param_is_error(i) {
-                return Err(guar);
-            }
+            opaque_env.param_is_error(i)?;
 
             return Err(tcx.dcx().emit_err(NonGenericOpaqueTypeParam {
                 ty: arg,
diff --git a/compiler/rustc_borrowck/src/type_check/liveness/mod.rs b/compiler/rustc_borrowck/src/type_check/liveness/mod.rs
index 8b863efad6c..b777e01f7a6 100644
--- a/compiler/rustc_borrowck/src/type_check/liveness/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/liveness/mod.rs
@@ -12,9 +12,7 @@ use rustc_mir_dataflow::ResultsCursor;
 use std::rc::Rc;
 
 use crate::{
-    constraints::OutlivesConstraintSet,
-    facts::{AllFacts, AllFactsExt},
-    region_infer::values::LivenessValues,
+    constraints::OutlivesConstraintSet, region_infer::values::LivenessValues,
     universal_regions::UniversalRegions,
 };
 
@@ -38,7 +36,6 @@ pub(super) fn generate<'mir, 'tcx>(
     elements: &Rc<DenseLocationMap>,
     flow_inits: &mut ResultsCursor<'mir, 'tcx, MaybeInitializedPlaces<'mir, 'tcx>>,
     move_data: &MoveData<'tcx>,
-    use_polonius: bool,
 ) {
     debug!("liveness::generate");
 
@@ -49,11 +46,8 @@ pub(super) fn generate<'mir, 'tcx>(
     );
     let (relevant_live_locals, boring_locals) =
         compute_relevant_live_locals(typeck.tcx(), &free_regions, body);
-    let facts_enabled = use_polonius || AllFacts::enabled(typeck.tcx());
 
-    if facts_enabled {
-        polonius::populate_access_facts(typeck, body, move_data);
-    };
+    polonius::populate_access_facts(typeck, body, move_data);
 
     trace::trace(
         typeck,
diff --git a/compiler/rustc_borrowck/src/type_check/liveness/polonius.rs b/compiler/rustc_borrowck/src/type_check/liveness/polonius.rs
index d8f03a07a63..a009e28a0dd 100644
--- a/compiler/rustc_borrowck/src/type_check/liveness/polonius.rs
+++ b/compiler/rustc_borrowck/src/type_check/liveness/polonius.rs
@@ -87,10 +87,10 @@ pub(super) fn populate_access_facts<'a, 'tcx>(
     body: &Body<'tcx>,
     move_data: &MoveData<'tcx>,
 ) {
-    debug!("populate_access_facts()");
-    let location_table = typeck.borrowck_context.location_table;
-
     if let Some(facts) = typeck.borrowck_context.all_facts.as_mut() {
+        debug!("populate_access_facts()");
+        let location_table = typeck.borrowck_context.location_table;
+
         let mut extractor = UseFactsExtractor {
             var_defined_at: &mut facts.var_defined_at,
             var_used_at: &mut facts.var_used_at,
diff --git a/compiler/rustc_borrowck/src/type_check/liveness/trace.rs b/compiler/rustc_borrowck/src/type_check/liveness/trace.rs
index 50843c602cc..359c4ea0eb1 100644
--- a/compiler/rustc_borrowck/src/type_check/liveness/trace.rs
+++ b/compiler/rustc_borrowck/src/type_check/liveness/trace.rs
@@ -217,35 +217,52 @@ impl<'me, 'typeck, 'flow, 'tcx> LivenessResults<'me, 'typeck, 'flow, 'tcx> {
     /// Add facts for all locals with free regions, since regions may outlive
     /// the function body only at certain nodes in the CFG.
     fn add_extra_drop_facts(&mut self, relevant_live_locals: &[Local]) -> Option<()> {
-        let drop_used = self
-            .cx
-            .typeck
-            .borrowck_context
-            .all_facts
-            .as_ref()
-            .map(|facts| facts.var_dropped_at.clone())?;
+        // This collect is more necessary than immediately apparent
+        // because these facts go into `add_drop_live_facts_for()`,
+        // which also writes to `all_facts`, and so this is genuinely
+        // a simulatneous overlapping mutable borrow.
+        // FIXME for future hackers: investigate whether this is
+        // actually necessary; these facts come from Polonius
+        // and probably maybe plausibly does not need to go back in.
+        // It may be necessary to just pick out the parts of
+        // `add_drop_live_facts_for()` that make sense.
+        let facts_to_add: Vec<_> = {
+            let drop_used = &self.cx.typeck.borrowck_context.all_facts.as_ref()?.var_dropped_at;
+
+            let relevant_live_locals: FxIndexSet<_> =
+                relevant_live_locals.iter().copied().collect();
+
+            drop_used
+                .iter()
+                .filter_map(|(local, location_index)| {
+                    let local_ty = self.cx.body.local_decls[*local].ty;
+                    if relevant_live_locals.contains(local) || !local_ty.has_free_regions() {
+                        return None;
+                    }
 
-        let relevant_live_locals: FxIndexSet<_> = relevant_live_locals.iter().copied().collect();
-
-        let locations = IntervalSet::new(self.cx.elements.num_points());
-
-        for (local, location_index) in drop_used {
-            if !relevant_live_locals.contains(&local) {
-                let local_ty = self.cx.body.local_decls[local].ty;
-                if local_ty.has_free_regions() {
                     let location = match self
                         .cx
                         .typeck
                         .borrowck_context
                         .location_table
-                        .to_location(location_index)
+                        .to_location(*location_index)
                     {
                         RichLocation::Start(l) => l,
                         RichLocation::Mid(l) => l,
                     };
-                    self.cx.add_drop_live_facts_for(local, local_ty, &[location], &locations);
-                }
-            }
+
+                    Some((*local, local_ty, location))
+                })
+                .collect()
+        };
+
+        // FIXME: these locations seem to have a special meaning (e.g. everywhere, at the end, ...), but I don't know which one. Please help me rename it to something descriptive!
+        // Also, if this IntervalSet is used in many places, it maybe should have a newtype'd
+        // name with a description of what it means for future mortals passing by.
+        let locations = IntervalSet::new(self.cx.elements.num_points());
+
+        for (local, local_ty, location) in facts_to_add {
+            self.cx.add_drop_live_facts_for(local, local_ty, &[location], &locations);
         }
         Some(())
     }
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index c7c1b2af6a7..81bde14a82f 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -133,7 +133,6 @@ pub(crate) fn type_check<'mir, 'tcx>(
     move_data: &MoveData<'tcx>,
     elements: &Rc<DenseLocationMap>,
     upvars: &[&ty::CapturedPlace<'tcx>],
-    use_polonius: bool,
 ) -> MirTypeckResults<'tcx> {
     let implicit_region_bound = ty::Region::new_var(infcx.tcx, universal_regions.fr_fn_body);
     let mut constraints = MirTypeckRegionConstraints {
@@ -189,7 +188,7 @@ pub(crate) fn type_check<'mir, 'tcx>(
     checker.equate_inputs_and_outputs(body, universal_regions, &normalized_inputs_and_output);
     checker.check_signature_annotation(body);
 
-    liveness::generate(&mut checker, body, elements, flow_inits, move_data, use_polonius);
+    liveness::generate(&mut checker, body, elements, flow_inits, move_data);
 
     translate_outlives_facts(&mut checker);
     let opaque_type_values = infcx.take_opaque_types();