Replace Session should_remap_filepaths with filename_display_preference

compiler/rustc_codegen_cranelift/src/debuginfo/line_info.rs

@@ -87,11 +87,7 @@ impl DebugContext {
         match &source_file.name {
             FileName::Real(path) => {
                 let (dir_path, file_name) =
-                    split_path_dir_and_file(if self.should_remap_filepaths {
-                        path.remapped_path_if_available()
-                    } else {
-                        path.local_path_if_available()
-                    });
+                    split_path_dir_and_file(path.to_path(self.filename_display_preference));
                 let dir_name = osstr_as_utf8_bytes(dir_path.as_os_str());
                 let file_name = osstr_as_utf8_bytes(file_name);
 
@@ -112,14 +108,7 @@ impl DebugContext {
             filename => {
                 let dir_id = line_program.default_directory();
                 let dummy_file_name = LineString::new(
-                    filename
-                        .display(if self.should_remap_filepaths {
-                            FileNameDisplayPreference::Remapped
-                        } else {
-                            FileNameDisplayPreference::Local
-                        })
-                        .to_string()
-                        .into_bytes(),
+                    filename.display(self.filename_display_preference).to_string().into_bytes(),
                     line_program.encoding(),
                     line_strings,
                 );

compiler/rustc_codegen_cranelift/src/debuginfo/mod.rs

@@ -29,7 +29,7 @@ pub(crate) struct DebugContext {
     dwarf: DwarfUnit,
     unit_range_list: RangeList,
 
-    should_remap_filepaths: bool,
+    filename_display_preference: FileNameDisplayPreference,
 }
 
 pub(crate) struct FunctionDebugContext {
@@ -63,26 +63,17 @@ impl DebugContext {
         let mut dwarf = DwarfUnit::new(encoding);
 
         use rustc_session::config::RemapPathScopeComponents;
-        use rustc_session::RemapFileNameExt;
 
-        let should_remap_filepaths =
-            tcx.sess.should_prefer_remapped(RemapPathScopeComponents::DEBUGINFO);
+        let filename_display_preference =
+            tcx.sess.filename_display_preference(RemapPathScopeComponents::DEBUGINFO);
 
         let producer = producer(tcx.sess);
-        let comp_dir = tcx
-            .sess
-            .opts
-            .working_dir
-            .for_scope(tcx.sess, RemapPathScopeComponents::DEBUGINFO)
-            .to_string_lossy()
-            .to_string();
+        let comp_dir =
+            tcx.sess.opts.working_dir.to_string_lossy(filename_display_preference).to_string();
 
         let (name, file_info) = match tcx.sess.local_crate_source_file() {
             Some(path) => {
-                let name = path
-                    .for_scope(tcx.sess, RemapPathScopeComponents::DEBUGINFO)
-                    .to_string_lossy()
-                    .to_string();
+                let name = path.to_string_lossy(filename_display_preference).to_string();
                 (name, None)
             }
             None => (tcx.crate_name(LOCAL_CRATE).to_string(), None),
@@ -116,7 +107,7 @@ impl DebugContext {
             endian,
             dwarf,
             unit_range_list: RangeList(Vec::new()),
-            should_remap_filepaths,
+            filename_display_preference,
         }
     }
 

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -258,19 +258,17 @@ pub fn target_machine_factory(
     };
     let debuginfo_compression = SmallCStr::new(&debuginfo_compression);
 
-    let should_prefer_remapped_paths =
-        sess.should_prefer_remapped(RemapPathScopeComponents::DEBUGINFO);
+    let file_name_display_preference =
+        sess.filename_display_preference(RemapPathScopeComponents::DEBUGINFO);
 
     Arc::new(move |config: TargetMachineFactoryConfig| {
         let path_to_cstring_helper = |path: Option<PathBuf>| -> CString {
             let path = path.unwrap_or_default();
-            let path = path_mapping.to_real_filename(path);
-            let path = if should_prefer_remapped_paths {
-                path.remapped_path_if_available()
-            } else {
-                path.local_path_if_available()
-            };
-            CString::new(path.to_str().unwrap()).unwrap()
+            let path = path_mapping
+                .to_real_filename(path)
+                .to_string_lossy(file_name_display_preference)
+                .into_owned();
+            CString::new(path).unwrap()
         };
 
         let split_dwarf_file = path_to_cstring_helper(config.split_dwarf_file);

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -554,13 +554,16 @@ pub fn file_metadata<'ll>(cx: &CodegenCx<'ll, '_>, source_file: &SourceFile) ->
     ) -> &'ll DIFile {
         debug!(?source_file.name);
 
-        use rustc_session::{config::RemapPathScopeComponents, RemapFileNameExt};
+        let filename_display_preference =
+            cx.sess().filename_display_preference(RemapPathScopeComponents::DEBUGINFO);
+
+        use rustc_session::config::RemapPathScopeComponents;
         let (directory, file_name) = match &source_file.name {
             FileName::Real(filename) => {
                 let working_directory = &cx.sess().opts.working_dir;
                 debug!(?working_directory);
 
-                if cx.sess().should_prefer_remapped(RemapPathScopeComponents::DEBUGINFO) {
+                if filename_display_preference == FileNameDisplayPreference::Remapped {
                     let filename = cx
                         .sess()
                         .source_map()
@@ -623,13 +626,7 @@ pub fn file_metadata<'ll>(cx: &CodegenCx<'ll, '_>, source_file: &SourceFile) ->
             }
             other => {
                 debug!(?other);
-                (
-                    "".into(),
-                    other
-                        .for_scope(cx.sess(), RemapPathScopeComponents::DEBUGINFO)
-                        .to_string_lossy()
-                        .into_owned(),
-                )
+                ("".into(), other.display(filename_display_preference).to_string())
             }
         };
 

compiler/rustc_session/src/session.rs

@@ -29,7 +29,7 @@ use rustc_macros::HashStable_Generic;
 pub use rustc_span::def_id::StableCrateId;
 use rustc_span::edition::Edition;
 use rustc_span::source_map::{FileLoader, FilePathMapping, RealFileLoader, SourceMap};
-use rustc_span::RealFileName;
+use rustc_span::{FileNameDisplayPreference, RealFileName};
 use rustc_span::{SourceFileHashAlgorithm, Span, Symbol};
 use rustc_target::asm::InlineAsmArch;
 use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel};
@@ -882,8 +882,19 @@ impl Session {
         self.opts.cg.link_dead_code.unwrap_or(false)
     }
 
-    pub fn should_prefer_remapped(&self, scope: RemapPathScopeComponents) -> bool {
-        self.opts.unstable_opts.remap_path_scope.contains(scope)
+    pub fn filename_display_preference(
+        &self,
+        scope: RemapPathScopeComponents,
+    ) -> FileNameDisplayPreference {
+        assert!(
+            scope.bits().count_ones() == 1,
+            "one and only one scope should be passed to `Session::filename_display_preference`"
+        );
+        if self.opts.unstable_opts.remap_path_scope.contains(scope) {
+            FileNameDisplayPreference::Remapped
+        } else {
+            FileNameDisplayPreference::Local
+        }
     }
 }
 

compiler/rustc_span/src/lib.rs

@@ -271,6 +271,18 @@ impl RealFileName {
         }
     }
 
+    /// Return the path remmapped or not depending on the [`FileNameDisplayPreference`].
+    ///
+    /// For the purpose of this function, local and short preference are equal.
+    pub fn to_path(&self, display_pref: FileNameDisplayPreference) -> &Path {
+        match display_pref {
+            FileNameDisplayPreference::Local | FileNameDisplayPreference::Short => {
+                self.local_path_if_available()
+            }
+            FileNameDisplayPreference::Remapped => self.remapped_path_if_available(),
+        }
+    }
+
     pub fn to_string_lossy(&self, display_pref: FileNameDisplayPreference) -> Cow<'_, str> {
         match display_pref {
             FileNameDisplayPreference::Local => self.local_path_if_available().to_string_lossy(),