Slightly simplify DiagCtxt::make_silent

Author: bjorn3

Diff for: compiler/rustc_errors/src/emitter.rs

@@ -35,8 +35,8 @@ use crate::snippet::{
 use crate::styled_buffer::StyledBuffer;
 use crate::translation::{Translate, to_fluent_args};
 use crate::{
-    CodeSuggestion, DiagCtxt, DiagInner, DiagMessage, ErrCode, FluentBundle, LazyFallbackBundle,
-    Level, MultiSpan, Subdiag, SubstitutionHighlight, SuggestionStyle, TerminalUrl,
+    CodeSuggestion, DiagInner, DiagMessage, ErrCode, FluentBundle, LazyFallbackBundle, Level,
+    MultiSpan, Subdiag, SubstitutionHighlight, SuggestionStyle, TerminalUrl,
 };
 
 /// Default column width, used in tests and when terminal dimensions cannot be determined.
@@ -537,11 +537,11 @@ impl Emitter for HumanEmitter {
 }
 
 /// An emitter that does nothing when emitting a non-fatal diagnostic.
-/// Fatal diagnostics are forwarded to `fatal_dcx` to avoid silent
+/// Fatal diagnostics are forwarded to `fatal_emitter` to avoid silent
 /// failures of rustc, as witnessed e.g. in issue #89358.
 pub struct SilentEmitter {
     pub fallback_bundle: LazyFallbackBundle,
-    pub fatal_dcx: DiagCtxt,
+    pub fatal_emitter: Box<dyn Emitter + DynSend>,
     pub fatal_note: Option<String>,
     pub emit_fatal_diagnostic: bool,
 }
@@ -563,12 +563,12 @@ impl Emitter for SilentEmitter {
         None
     }
 
-    fn emit_diagnostic(&mut self, mut diag: DiagInner, _registry: &Registry) {
+    fn emit_diagnostic(&mut self, mut diag: DiagInner, registry: &Registry) {
         if self.emit_fatal_diagnostic && diag.level == Level::Fatal {
             if let Some(fatal_note) = &self.fatal_note {
                 diag.sub(Level::Note, fatal_note.clone(), MultiSpan::new());
             }
-            self.fatal_dcx.handle().emit_diagnostic(diag);
+            self.fatal_emitter.emit_diagnostic(diag, registry);
         }
     }
 }

Diff for: compiler/rustc_errors/src/lib.rs

@@ -59,7 +59,7 @@ use emitter::{DynEmitter, Emitter, is_case_difference, is_different};
 use rustc_data_structures::AtomicRef;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::stable_hasher::{Hash128, StableHasher};
-use rustc_data_structures::sync::Lock;
+use rustc_data_structures::sync::{DynSend, Lock};
 pub use rustc_error_messages::{
     DiagMessage, FluentBundle, LanguageIdentifier, LazyFallbackBundle, MultiSpan, SpanLabel,
     SubdiagMessage, fallback_fluent_bundle, fluent_bundle,
@@ -682,51 +682,40 @@ impl DiagCtxt {
         fatal_note: Option<String>,
         emit_fatal_diagnostic: bool,
     ) {
-        self.wrap_emitter(|old_dcx| {
-            Box::new(emitter::SilentEmitter {
-                fallback_bundle,
-                fatal_dcx: DiagCtxt { inner: Lock::new(old_dcx) },
-                fatal_note,
-                emit_fatal_diagnostic,
-            })
-        });
-    }
-
-    fn wrap_emitter<F>(&self, f: F)
-    where
-        F: FnOnce(DiagCtxtInner) -> Box<DynEmitter>,
-    {
-        // A empty type that implements `Emitter` so that a `DiagCtxtInner` can be constructed
-        // to temporarily swap in place of the real one, which will be used in constructing
-        // its replacement.
+        // An empty type that implements `Emitter` to temporarily swap in place of the real one,
+        // which will be used in constructing its replacement.
         struct FalseEmitter;
 
         impl Emitter for FalseEmitter {
             fn emit_diagnostic(&mut self, _: DiagInner, _: &Registry) {
-                unimplemented!("false emitter must only used during `wrap_emitter`")
+                unimplemented!("false emitter must only used during `make_silent`")
             }
 
             fn source_map(&self) -> Option<&SourceMap> {
-                unimplemented!("false emitter must only used during `wrap_emitter`")
+                unimplemented!("false emitter must only used during `make_silent`")
             }
         }
 
         impl translation::Translate for FalseEmitter {
             fn fluent_bundle(&self) -> Option<&FluentBundle> {
-                unimplemented!("false emitter must only used during `wrap_emitter`")
+                unimplemented!("false emitter must only used during `make_silent`")
             }
 
             fn fallback_fluent_bundle(&self) -> &FluentBundle {
-                unimplemented!("false emitter must only used during `wrap_emitter`")
+                unimplemented!("false emitter must only used during `make_silent`")
             }
         }
 
         let mut inner = self.inner.borrow_mut();
-        let mut prev_dcx = DiagCtxtInner::new(Box::new(FalseEmitter));
-        std::mem::swap(&mut *inner, &mut prev_dcx);
-        let new_emitter = f(prev_dcx);
-        let mut new_dcx = DiagCtxtInner::new(new_emitter);
-        std::mem::swap(&mut *inner, &mut new_dcx);
+        let mut prev_emitter = Box::new(FalseEmitter) as Box<dyn Emitter + DynSend>;
+        std::mem::swap(&mut inner.emitter, &mut prev_emitter);
+        let new_emitter = Box::new(emitter::SilentEmitter {
+            fallback_bundle,
+            fatal_emitter: prev_emitter,
+            fatal_note,
+            emit_fatal_diagnostic,
+        });
+        inner.emitter = new_emitter;
     }
 
     /// Translate `message` eagerly with `args` to `SubdiagMessage::Eager`.

Diff for: compiler/rustc_session/src/parse.rs

@@ -277,14 +277,13 @@ impl ParseSess {
     ) -> Self {
         let fallback_bundle = fallback_fluent_bundle(locale_resources, false);
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-        let emitter = Box::new(HumanEmitter::new(
+        let fatal_emitter = Box::new(HumanEmitter::new(
             stderr_destination(ColorConfig::Auto),
             Lrc::clone(&fallback_bundle),
         ));
-        let fatal_dcx = DiagCtxt::new(emitter);
         let dcx = DiagCtxt::new(Box::new(SilentEmitter {
             fallback_bundle,
-            fatal_dcx,
+            fatal_emitter,
             fatal_note: Some(fatal_note),
             emit_fatal_diagnostic,
         }))

Diff for: src/tools/rustfmt/src/parse/session.rs

@@ -121,7 +121,7 @@ fn default_dcx(
     let emitter: Box<DynEmitter> = if !show_parse_errors {
         Box::new(SilentEmitter {
             fallback_bundle,
-            fatal_dcx: DiagCtxt::new(emitter),
+            fatal_emitter: emitter,
             fatal_note: None,
             emit_fatal_diagnostic: false,
         })