Remove name_was_remapped field from SourceFile as this can now be inferred by RealFileName variants

Author: cbeuw

Diff for: compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -1692,7 +1692,6 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
                     // containing the information we need.
                     let rustc_span::SourceFile {
                         mut name,
-                        name_was_remapped,
                         src_hash,
                         start_pos,
                         end_pos,
@@ -1707,8 +1706,6 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
                     // If this file's path has been remapped to `/rustc/$hash`,
                     // we might be able to reverse that (also see comments above,
                     // on `try_to_translate_virtual_to_real`).
-                    // FIXME(eddyb) we could check `name_was_remapped` here,
-                    // but in practice it seems to be always `false`.
                     try_to_translate_virtual_to_real(&mut name);
 
                     let source_length = (end_pos - start_pos).to_usize();
@@ -1733,7 +1730,6 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
 
                     let local_version = sess.source_map().new_imported_source_file(
                         name,
-                        name_was_remapped,
                         src_hash,
                         name_hash,
                         source_length,

Diff for: compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -28,9 +28,12 @@ use rustc_middle::ty::codec::TyEncoder;
 use rustc_middle::ty::{self, SymbolName, Ty, TyCtxt};
 use rustc_serialize::{opaque, Encodable, Encoder};
 use rustc_session::config::CrateType;
-use rustc_span::hygiene::{ExpnDataEncodeMode, HygieneEncodeContext, MacroKind};
 use rustc_span::symbol::{sym, Ident, Symbol};
 use rustc_span::{self, ExternalSource, FileName, SourceFile, Span, SyntaxContext};
+use rustc_span::{
+    hygiene::{ExpnDataEncodeMode, HygieneEncodeContext, MacroKind},
+    RealFileName,
+};
 use rustc_target::abi::VariantIdx;
 use std::hash::Hash;
 use std::num::NonZeroUsize;
@@ -485,18 +488,22 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             })
             .map(|(_, source_file)| {
                 let mut adapted = match source_file.name {
-                    // This path of this SourceFile has been modified by
-                    // path-remapping, so we use it verbatim (and avoid
-                    // cloning the whole map in the process).
-                    _ if source_file.name_was_remapped => source_file.clone(),
-
-                    // Otherwise expand all paths to absolute paths because
-                    // any relative paths are potentially relative to a
-                    // wrong directory.
                     FileName::Real(ref name) => {
-                        let name = name.stable_name();
+                        // Expand all local paths to absolute paths because
+                        // any relative paths are potentially relative to a
+                        // wrong directory.
                         let mut adapted = (**source_file).clone();
-                        adapted.name = Path::new(&working_dir).join(name).into();
+                        adapted.name = match name {
+                            RealFileName::Named(local_path) => {
+                                Path::new(&working_dir).join(local_path).into()
+                            }
+                            RealFileName::Virtualized { local_path, virtual_name } => {
+                                FileName::Real(RealFileName::Virtualized {
+                                    local_path: Path::new(&working_dir).join(local_path),
+                                    virtual_name: virtual_name.clone(),
+                                })
+                            }
+                        };
                         adapted.name_hash = {
                             let mut hasher: StableHasher = StableHasher::new();
                             adapted.name.hash(&mut hasher);

Diff for: compiler/rustc_middle/src/ich/impls_syntax.rs

@@ -61,7 +61,6 @@ impl<'a> HashStable<StableHashingContext<'a>> for SourceFile {
         let SourceFile {
             name: _, // We hash the smaller name_hash instead of this
             name_hash,
-            name_was_remapped,
             cnum,
             // Do not hash the source as it is not encoded
             src: _,
@@ -76,7 +75,6 @@ impl<'a> HashStable<StableHashingContext<'a>> for SourceFile {
         } = *self;
 
         (name_hash as u64).hash_stable(hcx, hasher);
-        name_was_remapped.hash_stable(hcx, hasher);
 
         src_hash.hash_stable(hcx, hasher);
 

Diff for: compiler/rustc_save_analysis/src/span_utils.rs

@@ -16,8 +16,7 @@ impl<'a> SpanUtils<'a> {
 
     pub fn make_filename_string(&self, file: &SourceFile) -> String {
         match &file.name {
-            FileName::Real(name) if !file.name_was_remapped => {
-                let path = name.local_path();
+            FileName::Real(RealFileName::Named(path)) => {
                 if path.is_absolute() {
                     self.sess
                         .source_map()
@@ -30,8 +29,11 @@ impl<'a> SpanUtils<'a> {
                     self.sess.working_dir.0.join(&path).display().to_string()
                 }
             }
-            // If the file name is already remapped, we assume the user
+            // If the file name was remapped, we assume the user
             // configured it the way they wanted to, so use that directly
+            FileName::Real(RealFileName::Virtualized { local_path: _, virtual_name }) => {
+                virtual_name.display().to_string()
+            }
             filename => filename.to_string(),
         }
     }

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

@@ -1118,8 +1118,6 @@ pub struct SourceFile {
     /// originate from files has names between angle brackets by convention
     /// (e.g., `<anon>`).
     pub name: FileName,
-    /// `true` if the `name` field above has been modified by `--remap-path-prefix`.
-    pub name_was_remapped: bool,
     /// The complete source code.
     pub src: Option<Lrc<String>>,
     /// The source code's hash.
@@ -1149,7 +1147,6 @@ impl<S: Encoder> Encodable<S> for SourceFile {
     fn encode(&self, s: &mut S) -> Result<(), S::Error> {
         s.emit_struct("SourceFile", 8, |s| {
             s.emit_struct_field("name", 0, |s| self.name.encode(s))?;
-            s.emit_struct_field("name_was_remapped", 1, |s| self.name_was_remapped.encode(s))?;
             s.emit_struct_field("src_hash", 2, |s| self.src_hash.encode(s))?;
             s.emit_struct_field("start_pos", 3, |s| self.start_pos.encode(s))?;
             s.emit_struct_field("end_pos", 4, |s| self.end_pos.encode(s))?;
@@ -1224,8 +1221,6 @@ impl<D: Decoder> Decodable<D> for SourceFile {
     fn decode(d: &mut D) -> Result<SourceFile, D::Error> {
         d.read_struct("SourceFile", 8, |d| {
             let name: FileName = d.read_struct_field("name", 0, |d| Decodable::decode(d))?;
-            let name_was_remapped: bool =
-                d.read_struct_field("name_was_remapped", 1, |d| Decodable::decode(d))?;
             let src_hash: SourceFileHash =
                 d.read_struct_field("src_hash", 2, |d| Decodable::decode(d))?;
             let start_pos: BytePos =
@@ -1269,7 +1264,6 @@ impl<D: Decoder> Decodable<D> for SourceFile {
             let cnum: CrateNum = d.read_struct_field("cnum", 10, |d| Decodable::decode(d))?;
             Ok(SourceFile {
                 name,
-                name_was_remapped,
                 start_pos,
                 end_pos,
                 src: None,
@@ -1297,7 +1291,6 @@ impl fmt::Debug for SourceFile {
 impl SourceFile {
     pub fn new(
         name: FileName,
-        name_was_remapped: bool,
         mut src: String,
         start_pos: BytePos,
         hash_kind: SourceFileHashAlgorithm,
@@ -1319,7 +1312,6 @@ impl SourceFile {
 
         SourceFile {
             name,
-            name_was_remapped,
             src: Some(Lrc::new(src)),
             src_hash,
             external_src: Lock::new(ExternalSource::Unneeded),

Diff for: compiler/rustc_span/src/source_map.rs

@@ -127,17 +127,16 @@ pub struct StableSourceFileId(u128);
 // StableSourceFileId, perhaps built atop source_file.name_hash.
 impl StableSourceFileId {
     pub fn new(source_file: &SourceFile) -> StableSourceFileId {
-        StableSourceFileId::new_from_pieces(&source_file.name, source_file.name_was_remapped)
+        StableSourceFileId::new_from_name(&source_file.name)
     }
 
-    fn new_from_pieces(name: &FileName, name_was_remapped: bool) -> StableSourceFileId {
+    fn new_from_name(name: &FileName) -> StableSourceFileId {
         let mut hasher = StableHasher::new();
 
         // If name was virtualized, we need to take both the local path
         // and stablised path into account, in case two different paths were
         // mapped to the same
         name.hash(&mut hasher);
-        name_was_remapped.hash(&mut hasher);
 
         StableSourceFileId(hasher.finish())
     }
@@ -276,9 +275,9 @@ impl SourceMap {
         // Note that filename may not be a valid path, eg it may be `<anon>` etc,
         // but this is okay because the directory determined by `path.pop()` will
         // be empty, so the working directory will be used.
-        let (filename, was_remapped) = self.path_mapping.map_filename_prefix(&filename);
+        let (filename, _) = self.path_mapping.map_filename_prefix(&filename);
 
-        let file_id = StableSourceFileId::new_from_pieces(&filename, was_remapped);
+        let file_id = StableSourceFileId::new_from_name(&filename);
 
         let lrc_sf = match self.source_file_by_stable_id(file_id) {
             Some(lrc_sf) => lrc_sf,
@@ -287,7 +286,6 @@ impl SourceMap {
 
                 let source_file = Lrc::new(SourceFile::new(
                     filename,
-                    was_remapped,
                     src,
                     Pos::from_usize(start_pos),
                     self.hash_kind,
@@ -311,7 +309,6 @@ impl SourceMap {
     pub fn new_imported_source_file(
         &self,
         filename: FileName,
-        name_was_remapped: bool,
         src_hash: SourceFileHash,
         name_hash: u128,
         source_len: usize,
@@ -346,11 +343,10 @@ impl SourceMap {
             nc.pos = nc.pos + start_pos;
         }
 
-        let (filename, name_is_remapped) = self.path_mapping.map_filename_prefix(&filename);
+        let (filename, _) = self.path_mapping.map_filename_prefix(&filename);
 
         let source_file = Lrc::new(SourceFile {
             name: filename,
-            name_was_remapped: name_was_remapped || name_is_remapped,
             src: None,
             src_hash,
             external_src: Lock::new(ExternalSource::Foreign {

Diff for: compiler/rustc_span/src/source_map/tests.rs

@@ -229,7 +229,6 @@ fn t10() {
 
     let SourceFile {
         name,
-        name_was_remapped,
         src_hash,
         start_pos,
         end_pos,
@@ -243,7 +242,6 @@ fn t10() {
 
     let imported_src_file = sm.new_imported_source_file(
         name,
-        name_was_remapped,
         src_hash,
         name_hash,
         (end_pos - start_pos).to_usize(),