Auto merge of #115418 - Zoxc:freeze-source, r=oli-obk

Use `Freeze` for `SourceFile`

This uses the `Freeze` type in `SourceFile` to let accessing `external_src` and `lines` be lock-free.

Behavior of `add_external_src` is changed to set `ExternalSourceKind::AbsentErr` on a hash mismatch which matches the documentation. `ExternalSourceKind::Unneeded` was removed as it's unused.

Based on https://github.com/rust-lang/rust/pull/115401.

4 files changed, 5 insertions, 5 deletions

diff --git a/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs b/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs
index d7a008f9a57..5d3b2f45166 100644
--- a/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs
+++ b/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs
@@ -169,7 +169,7 @@ impl AnnotateSnippetEmitterWriter {
                         .map(|line| {
                             // Ensure the source file is present before we try
                             // to load a string from it.
-                            source_map.ensure_source_file_source_present(file.clone());
+                            source_map.ensure_source_file_source_present(&file);
                             (
                                 format!("{}", source_map.filename_for_diagnostics(&file.name)),
                                 source_string(file.clone(), &line),
diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index da108327ae7..58be74f887b 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -1193,7 +1193,7 @@ impl EmitterWriter {
         let will_be_emitted = |span: Span| {
             !span.is_dummy() && {
                 let file = sm.lookup_source_file(span.hi());
-                sm.ensure_source_file_source_present(file)
+                sm.ensure_source_file_source_present(&file)
             }
         };
 
@@ -1388,7 +1388,7 @@ impl EmitterWriter {
         // Print out the annotate source lines that correspond with the error
         for annotated_file in annotated_files {
             // we can't annotate anything if the source is unavailable.
-            if !sm.ensure_source_file_source_present(annotated_file.file.clone()) {
+            if !sm.ensure_source_file_source_present(&annotated_file.file) {
                 if !self.short_message {
                     // We'll just print an unannotated message.
                     for (annotation_id, line) in annotated_file.lines.iter().enumerate() {
diff --git a/compiler/rustc_errors/src/json.rs b/compiler/rustc_errors/src/json.rs
index 390bf28df09..38667c5ff81 100644
--- a/compiler/rustc_errors/src/json.rs
+++ b/compiler/rustc_errors/src/json.rs
@@ -558,7 +558,7 @@ impl DiagnosticSpanLine {
             .span_to_lines(span)
             .map(|lines| {
                 // We can't get any lines if the source is unavailable.
-                if !je.sm.ensure_source_file_source_present(lines.file.clone()) {
+                if !je.sm.ensure_source_file_source_present(&lines.file) {
                     return vec![];
                 }
 
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 31547f19be0..990bd2d1cc9 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -273,7 +273,7 @@ impl CodeSuggestion {
                 assert!(!lines.lines.is_empty() || bounding_span.is_dummy());
 
                 // We can't splice anything if the source is unavailable.
-                if !sm.ensure_source_file_source_present(lines.file.clone()) {
+                if !sm.ensure_source_file_source_present(&lines.file) {
                     return None;
                 }