Make FileMap::{lines, multibyte_chars, non_narrow_chars} non-mutable.

2 files changed, 17 insertions, 43 deletions

diff --git a/src/libsyntax/codemap.rs b/src/libsyntax/codemap.rs
index 8e4b7660a1c..000f1607514 100644
--- a/src/libsyntax/codemap.rs
+++ b/src/libsyntax/codemap.rs
@@ -250,16 +250,7 @@ impl CodeMap {
     /// Creates a new filemap and sets its line information.
     /// This does not ensure that only one FileMap exists per file name.
     pub fn new_filemap_and_lines(&self, filename: &Path, src: &str) -> Lrc<FileMap> {
-        let fm = self.new_filemap(filename.to_owned().into(), src.to_owned());
-        let mut byte_pos: u32 = fm.start_pos.0;
-        for line in src.lines() {
-            // register the start of this line
-            fm.next_line(BytePos(byte_pos));
-
-            // update byte_pos to include this line and the \n at the end
-            byte_pos += line.len() as u32 + 1;
-        }
-        fm
+        self.new_filemap(filename.to_owned().into(), src.to_owned())
     }
 
 
@@ -305,9 +296,9 @@ impl CodeMap {
             external_src: Lock::new(ExternalSource::AbsentOk),
             start_pos,
             end_pos,
-            lines: Lock::new(file_local_lines),
-            multibyte_chars: Lock::new(file_local_multibyte_chars),
-            non_narrow_chars: Lock::new(file_local_non_narrow_chars),
+            lines: file_local_lines,
+            multibyte_chars: file_local_multibyte_chars,
+            non_narrow_chars: file_local_non_narrow_chars,
             name_hash,
         });
 
@@ -345,21 +336,22 @@ impl CodeMap {
         match self.lookup_line(pos) {
             Ok(FileMapAndLine { fm: f, line: a }) => {
                 let line = a + 1; // Line numbers start at 1
-                let linebpos = (*f.lines.borrow())[a];
+                let linebpos = f.lines[a];
                 let linechpos = self.bytepos_to_file_charpos(linebpos);
                 let col = chpos - linechpos;
 
                 let col_display = {
-                    let non_narrow_chars = f.non_narrow_chars.borrow();
-                    let start_width_idx = non_narrow_chars
+                    let start_width_idx = f
+                        .non_narrow_chars
                         .binary_search_by_key(&linebpos, |x| x.pos())
                         .unwrap_or_else(|x| x);
-                    let end_width_idx = non_narrow_chars
+                    let end_width_idx = f
+                        .non_narrow_chars
                         .binary_search_by_key(&pos, |x| x.pos())
                         .unwrap_or_else(|x| x);
                     let special_chars = end_width_idx - start_width_idx;
-                    let non_narrow: usize =
-                        non_narrow_chars[start_width_idx..end_width_idx]
+                    let non_narrow: usize = f
+                        .non_narrow_chars[start_width_idx..end_width_idx]
                         .into_iter()
                         .map(|x| x.width())
                         .sum();
@@ -380,12 +372,12 @@ impl CodeMap {
             }
             Err(f) => {
                 let col_display = {
-                    let non_narrow_chars = f.non_narrow_chars.borrow();
-                    let end_width_idx = non_narrow_chars
+                    let end_width_idx = f
+                        .non_narrow_chars
                         .binary_search_by_key(&pos, |x| x.pos())
                         .unwrap_or_else(|x| x);
-                    let non_narrow: usize =
-                        non_narrow_chars[0..end_width_idx]
+                    let non_narrow: usize = f
+                        .non_narrow_chars[0..end_width_idx]
                         .into_iter()
                         .map(|x| x.width())
                         .sum();
@@ -830,7 +822,7 @@ impl CodeMap {
         // The number of extra bytes due to multibyte chars in the FileMap
         let mut total_extra_bytes = 0;
 
-        for mbc in map.multibyte_chars.borrow().iter() {
+        for mbc in map.multibyte_chars.iter() {
             debug!("{}-byte char at {:?}", mbc.bytes, mbc.pos);
             if mbc.pos < bpos {
                 // every character is at least one byte, so we only
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index c09cfd910d2..dcc71e78778 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -51,11 +51,7 @@ pub struct StringReader<'a> {
     pub ch: Option<char>,
     pub filemap: Lrc<syntax_pos::FileMap>,
     /// Stop reading src at this index.
-    end_src_index: usize,
-    /// Whether to record new-lines and multibyte chars in filemap.
-    /// This is only necessary the first time a filemap is lexed.
-    /// If part of a filemap is being re-lexed, this should be set to false.
-    save_new_lines_and_multibyte: bool,
+    pub end_src_index: usize,
     // cached:
     peek_tok: token::Token,
     peek_span: Span,
@@ -188,7 +184,6 @@ impl<'a> StringReader<'a> {
             ch: Some('\n'),
             filemap,
             end_src_index: src.len(),
-            save_new_lines_and_multibyte: true,
             // dummy values; not read
             peek_tok: token::Eof,
             peek_span: syntax_pos::DUMMY_SP,
@@ -225,7 +220,6 @@ impl<'a> StringReader<'a> {
         let mut sr = StringReader::new_raw_internal(sess, begin.fm, None);
 
         // Seek the lexer to the right byte range.
-        sr.save_new_lines_and_multibyte = false;
         sr.next_pos = span.lo();
         sr.end_src_index = sr.src_index(span.hi());
 
@@ -458,18 +452,6 @@ impl<'a> StringReader<'a> {
             let next_ch = char_at(&self.src, next_src_index);
             let next_ch_len = next_ch.len_utf8();
 
-            if self.ch.unwrap() == '\n' {
-                if self.save_new_lines_and_multibyte {
-                    self.filemap.next_line(self.next_pos);
-                }
-            }
-            if next_ch_len > 1 {
-                if self.save_new_lines_and_multibyte {
-                    self.filemap.record_multibyte_char(self.next_pos, next_ch_len);
-                }
-            }
-            self.filemap.record_width(self.next_pos, next_ch);
-
             self.ch = Some(next_ch);
             self.pos = self.next_pos;
             self.next_pos = self.next_pos + Pos::from_usize(next_ch_len);