Rollup of 8 pull requests

compiler/rustc_borrowck/src/lib.rs

@@ -110,14 +110,16 @@ fn mir_borrowck(tcx: TyCtxt<'_>, def: LocalDefId) -> &BorrowCheckResult<'_> {
     let (input_body, promoted) = tcx.mir_promoted(def);
     debug!("run query mir_borrowck: {}", tcx.def_path_str(def));
 
-    if input_body.borrow().should_skip() {
-        debug!("Skipping borrowck because of injected body");
+    let input_body: &Body<'_> = &input_body.borrow();
+
+    if input_body.should_skip() || input_body.tainted_by_errors.is_some() {
+        debug!("Skipping borrowck because of injected body or tainted body");
         // Let's make up a borrowck result! Fun times!
         let result = BorrowCheckResult {
             concrete_opaque_types: FxIndexMap::default(),
             closure_requirements: None,
             used_mut_upvars: SmallVec::new(),
-            tainted_by_errors: None,
+            tainted_by_errors: input_body.tainted_by_errors,
         };
         return tcx.arena.alloc(result);
     }
@@ -126,7 +128,6 @@ fn mir_borrowck(tcx: TyCtxt<'_>, def: LocalDefId) -> &BorrowCheckResult<'_> {
 
     let infcx =
         tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::Bind(hir_owner.def_id)).build();
-    let input_body: &Body<'_> = &input_body.borrow();
     let promoted: &IndexSlice<_, _> = &promoted.borrow();
     let opt_closure_req = do_mir_borrowck(&infcx, input_body, promoted, None).0;
     debug!("mir_borrowck done");

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -15,10 +15,7 @@ use rustc_data_structures::profiling::{SelfProfilerRef, VerboseTimingGuard};
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::Emitter;
 use rustc_errors::translation::Translate;
-use rustc_errors::{
-    DiagCtxt, DiagnosticArgName, DiagnosticArgValue, DiagnosticBuilder, DiagnosticMessage, ErrCode,
-    FatalError, FluentBundle, Level, Style,
-};
+use rustc_errors::{DiagCtxt, Diagnostic, DiagnosticBuilder, FatalError, FluentBundle, Level};
 use rustc_fs_util::link_or_copy;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc_incremental::{
@@ -997,13 +994,6 @@ pub(crate) enum Message<B: WriteBackendMethods> {
 /// process another codegen unit.
 pub struct CguMessage;
 
-struct Diagnostic {
-    msgs: Vec<(DiagnosticMessage, Style)>,
-    args: FxHashMap<DiagnosticArgName, DiagnosticArgValue>,
-    code: Option<ErrCode>,
-    lvl: Level,
-}
-
 #[derive(PartialEq, Clone, Copy, Debug)]
 enum MainThreadState {
     /// Doing nothing.
@@ -1764,7 +1754,6 @@ fn spawn_work<'a, B: ExtraBackendMethods>(
 enum SharedEmitterMessage {
     Diagnostic(Diagnostic),
     InlineAsmError(u32, String, Level, Option<(String, Vec<InnerSpan>)>),
-    AbortIfErrors,
     Fatal(String),
 }
 
@@ -1810,24 +1799,8 @@ impl Translate for SharedEmitter {
 }
 
 impl Emitter for SharedEmitter {
-    fn emit_diagnostic(&mut self, diag: &rustc_errors::Diagnostic) {
-        let args: FxHashMap<DiagnosticArgName, DiagnosticArgValue> =
-            diag.args().map(|(name, arg)| (name.clone(), arg.clone())).collect();
-        drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
-            msgs: diag.messages.clone(),
-            args: args.clone(),
-            code: diag.code,
-            lvl: diag.level(),
-        })));
-        for child in &diag.children {
-            drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
-                msgs: child.messages.clone(),
-                args: args.clone(),
-                code: None,
-                lvl: child.level,
-            })));
-        }
-        drop(self.sender.send(SharedEmitterMessage::AbortIfErrors));
+    fn emit_diagnostic(&mut self, diag: rustc_errors::Diagnostic) {
+        drop(self.sender.send(SharedEmitterMessage::Diagnostic(diag)));
     }
 
     fn source_map(&self) -> Option<&Lrc<SourceMap>> {
@@ -1852,13 +1825,8 @@ impl SharedEmitterMain {
 
             match message {
                 Ok(SharedEmitterMessage::Diagnostic(diag)) => {
-                    let dcx = sess.dcx();
-                    let mut d = rustc_errors::Diagnostic::new_with_messages(diag.lvl, diag.msgs);
-                    if let Some(code) = diag.code {
-                        d.code(code);
-                    }
-                    d.replace_args(diag.args);
-                    dcx.emit_diagnostic(d);
+                    sess.dcx().emit_diagnostic(diag);
+                    sess.dcx().abort_if_errors();
                 }
                 Ok(SharedEmitterMessage::InlineAsmError(cookie, msg, level, source)) => {
                     assert!(matches!(level, Level::Error | Level::Warning | Level::Note));
@@ -1891,9 +1859,6 @@ impl SharedEmitterMain {
 
                     err.emit();
                 }
-                Ok(SharedEmitterMessage::AbortIfErrors) => {
-                    sess.dcx().abort_if_errors();
-                }
                 Ok(SharedEmitterMessage::Fatal(msg)) => {
                     sess.dcx().fatal(msg);
                 }

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -20,7 +20,7 @@ use std::mem;
 use std::ops::{ControlFlow, Deref};
 
 use super::ops::{self, NonConstOp, Status};
-use super::qualifs::{self, CustomEq, HasMutInterior, NeedsDrop, NeedsNonConstDrop};
+use super::qualifs::{self, HasMutInterior, NeedsDrop, NeedsNonConstDrop};
 use super::resolver::FlowSensitiveAnalysis;
 use super::{ConstCx, Qualif};
 use crate::const_eval::is_unstable_const_fn;
@@ -149,37 +149,10 @@ impl<'mir, 'tcx> Qualifs<'mir, 'tcx> {
 
         let return_loc = ccx.body.terminator_loc(return_block);
 
-        let custom_eq = match ccx.const_kind() {
-            // We don't care whether a `const fn` returns a value that is not structurally
-            // matchable. Functions calls are opaque and always use type-based qualification, so
-            // this value should never be used.
-            hir::ConstContext::ConstFn => true,
-
-            // If we know that all values of the return type are structurally matchable, there's no
-            // need to run dataflow.
-            // Opaque types do not participate in const generics or pattern matching, so we can safely count them out.
-            _ if ccx.body.return_ty().has_opaque_types()
-                || !CustomEq::in_any_value_of_ty(ccx, ccx.body.return_ty()) =>
-            {
-                false
-            }
-
-            hir::ConstContext::Const { .. } | hir::ConstContext::Static(_) => {
-                let mut cursor = FlowSensitiveAnalysis::new(CustomEq, ccx)
-                    .into_engine(ccx.tcx, ccx.body)
-                    .iterate_to_fixpoint()
-                    .into_results_cursor(ccx.body);
-
-                cursor.seek_after_primary_effect(return_loc);
-                cursor.get().contains(RETURN_PLACE)
-            }
-        };
-
         ConstQualifs {
             needs_drop: self.needs_drop(ccx, RETURN_PLACE, return_loc),
             needs_non_const_drop: self.needs_non_const_drop(ccx, RETURN_PLACE, return_loc),
             has_mut_interior: self.has_mut_interior(ccx, RETURN_PLACE, return_loc),
-            custom_eq,
             tainted_by_errors,
         }
     }

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

@@ -10,7 +10,7 @@ use rustc_middle::mir::*;
 use rustc_middle::traits::BuiltinImplSource;
 use rustc_middle::ty::{self, AdtDef, GenericArgsRef, Ty};
 use rustc_trait_selection::traits::{
-    self, ImplSource, Obligation, ObligationCause, ObligationCtxt, SelectionContext,
+    ImplSource, Obligation, ObligationCause, ObligationCtxt, SelectionContext,
 };
 
 use super::ConstCx;
@@ -24,7 +24,6 @@ pub fn in_any_value_of_ty<'tcx>(
         has_mut_interior: HasMutInterior::in_any_value_of_ty(cx, ty),
         needs_drop: NeedsDrop::in_any_value_of_ty(cx, ty),
         needs_non_const_drop: NeedsNonConstDrop::in_any_value_of_ty(cx, ty),
-        custom_eq: CustomEq::in_any_value_of_ty(cx, ty),
         tainted_by_errors,
     }
 }
@@ -213,35 +212,6 @@ impl Qualif for NeedsNonConstDrop {
     }
 }
 
-/// A constant that cannot be used as part of a pattern in a `match` expression.
-pub struct CustomEq;
-
-impl Qualif for CustomEq {
-    const ANALYSIS_NAME: &'static str = "flow_custom_eq";
-
-    fn in_qualifs(qualifs: &ConstQualifs) -> bool {
-        qualifs.custom_eq
-    }
-
-    fn in_any_value_of_ty<'tcx>(cx: &ConstCx<'_, 'tcx>, ty: Ty<'tcx>) -> bool {
-        // If *any* component of a composite data type does not implement `Structural{Partial,}Eq`,
-        // we know that at least some values of that type are not structural-match. I say "some"
-        // because that component may be part of an enum variant (e.g.,
-        // `Option::<NonStructuralMatchTy>::Some`), in which case some values of this type may be
-        // structural-match (`Option::None`).
-        traits::search_for_structural_match_violation(cx.body.span, cx.tcx, ty).is_some()
-    }
-
-    fn in_adt_inherently<'tcx>(
-        cx: &ConstCx<'_, 'tcx>,
-        def: AdtDef<'tcx>,
-        args: GenericArgsRef<'tcx>,
-    ) -> bool {
-        let ty = Ty::new_adt(cx.tcx, def, args);
-        !ty.is_structural_eq_shallow(cx.tcx)
-    }
-}
-
 // FIXME: Use `mir::visit::Visitor` for the `in_*` functions if/when it supports early return.
 
 /// Returns `true` if this `Rvalue` contains qualif `Q`.

compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs

@@ -44,15 +44,15 @@ impl Translate for AnnotateSnippetEmitter {
 
 impl Emitter for AnnotateSnippetEmitter {
     /// The entry point for the diagnostics generation
-    fn emit_diagnostic(&mut self, diag: &Diagnostic) {
+    fn emit_diagnostic(&mut self, mut diag: Diagnostic) {
         let fluent_args = to_fluent_args(diag.args());
 
-        let mut children = diag.children.clone();
-        let (mut primary_span, suggestions) = self.primary_span_formatted(diag, &fluent_args);
+        let mut suggestions = diag.suggestions.unwrap_or(vec![]);
+        self.primary_span_formatted(&mut diag.span, &mut suggestions, &fluent_args);
 
         self.fix_multispans_in_extern_macros_and_render_macro_backtrace(
-            &mut primary_span,
-            &mut children,
+            &mut diag.span,
+            &mut diag.children,
             &diag.level,
             self.macro_backtrace,
         );
@@ -62,9 +62,9 @@ impl Emitter for AnnotateSnippetEmitter {
             &diag.messages,
             &fluent_args,
             &diag.code,
-            &primary_span,
-            &children,
-            suggestions,
+            &diag.span,
+            &diag.children,
+            &suggestions,
         );
     }
 

compiler/rustc_errors/src/emitter.rs

@@ -193,7 +193,7 @@ pub type DynEmitter = dyn Emitter + DynSend;
 /// Emitter trait for emitting errors.
 pub trait Emitter: Translate {
     /// Emit a structured diagnostic.
-    fn emit_diagnostic(&mut self, diag: &Diagnostic);
+    fn emit_diagnostic(&mut self, diag: Diagnostic);
 
     /// Emit a notification that an artifact has been output.
     /// Currently only supported for the JSON format.
@@ -230,17 +230,17 @@ pub trait Emitter: Translate {
     ///
     /// * If the current `Diagnostic` has only one visible `CodeSuggestion`,
     ///   we format the `help` suggestion depending on the content of the
-    ///   substitutions. In that case, we return the modified span only.
+    ///   substitutions. In that case, we modify the span and clear the
+    ///   suggestions.
     ///
     /// * If the current `Diagnostic` has multiple suggestions,
-    ///   we return the original `primary_span` and the original suggestions.
-    fn primary_span_formatted<'a>(
+    ///   we leave `primary_span` and the suggestions untouched.
+    fn primary_span_formatted(
         &mut self,
-        diag: &'a Diagnostic,
+        primary_span: &mut MultiSpan,
+        suggestions: &mut Vec<CodeSuggestion>,
         fluent_args: &FluentArgs<'_>,
-    ) -> (MultiSpan, &'a [CodeSuggestion]) {
-        let mut primary_span = diag.span.clone();
-        let suggestions = diag.suggestions.as_deref().unwrap_or(&[]);
+    ) {
         if let Some((sugg, rest)) = suggestions.split_first() {
             let msg = self.translate_message(&sugg.msg, fluent_args).map_err(Report::new).unwrap();
             if rest.is_empty() &&
@@ -287,16 +287,15 @@ pub trait Emitter: Translate {
                 primary_span.push_span_label(sugg.substitutions[0].parts[0].span, msg);
 
                 // We return only the modified primary_span
-                (primary_span, &[])
+                suggestions.clear();
             } else {
                 // if there are multiple suggestions, print them all in full
                 // to be consistent. We could try to figure out if we can
                 // make one (or the first one) inline, but that would give
                 // undue importance to a semi-random suggestion
-                (primary_span, suggestions)
             }
         } else {
-            (primary_span, suggestions)
+            // do nothing
         }
     }
 
@@ -518,16 +517,15 @@ impl Emitter for HumanEmitter {
         self.sm.as_ref()
     }
 
-    fn emit_diagnostic(&mut self, diag: &Diagnostic) {
+    fn emit_diagnostic(&mut self, mut diag: Diagnostic) {
         let fluent_args = to_fluent_args(diag.args());
 
-        let mut children = diag.children.clone();
-        let (mut primary_span, suggestions) = self.primary_span_formatted(diag, &fluent_args);
-        debug!("emit_diagnostic: suggestions={:?}", suggestions);
+        let mut suggestions = diag.suggestions.unwrap_or(vec![]);
+        self.primary_span_formatted(&mut diag.span, &mut suggestions, &fluent_args);
 
         self.fix_multispans_in_extern_macros_and_render_macro_backtrace(
-            &mut primary_span,
-            &mut children,
+            &mut diag.span,
+            &mut diag.children,
             &diag.level,
             self.macro_backtrace,
         );
@@ -537,9 +535,9 @@ impl Emitter for HumanEmitter {
             &diag.messages,
             &fluent_args,
             &diag.code,
-            &primary_span,
-            &children,
-            suggestions,
+            &diag.span,
+            &diag.children,
+            &suggestions,
             self.track_diagnostics.then_some(&diag.emitted_at),
         );
     }
@@ -576,9 +574,8 @@ impl Emitter for SilentEmitter {
         None
     }
 
-    fn emit_diagnostic(&mut self, diag: &Diagnostic) {
+    fn emit_diagnostic(&mut self, mut diag: Diagnostic) {
         if diag.level == Level::Fatal {
-            let mut diag = diag.clone();
             diag.note(self.fatal_note.clone());
             self.fatal_dcx.emit_diagnostic(diag);
         }