Merge from rustc

[rust.git] / compiler / rustc_span / src / source_map.rs

diff --git a/compiler/rustc_span/src/source_map.rs b/compiler/rustc_span/src/source_map.rs
index 2ae57d9e56d7c5ce3ec0ff45c06bb8986fe231c2..fa09b4faa441f3b83d50809c92b426e708784b89 100644 (file)
--- a/compiler/rustc_span/src/source_map.rs
+++ b/compiler/rustc_span/src/source_map.rs
@@ -15,11 +15,10 @@
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_data_structures::sync::{AtomicU32, Lrc, MappedReadGuard, ReadGuard, RwLock};
+use std::cmp;
 use std::hash::Hash;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::Ordering;
-use std::{clone::Clone, cmp};
-use std::{convert::TryFrom, unreachable};
 
 use std::fs;
 use std::io;
@@ -439,7 +438,11 @@ pub fn lookup_line(&self, pos: BytePos) -> Result<SourceFileAndLine, Lrc<SourceF
         }
     }
 
-    fn span_to_string(&self, sp: Span, filename_display_pref: FileNameDisplayPreference) -> String {
+    pub fn span_to_string(
+        &self,
+        sp: Span,
+        filename_display_pref: FileNameDisplayPreference,
+    ) -> String {
         if self.files.borrow().source_files.is_empty() || sp.is_dummy() {
             return "no-location".to_string();
         }
@@ -447,12 +450,15 @@ fn span_to_string(&self, sp: Span, filename_display_pref: FileNameDisplayPrefere
         let lo = self.lookup_char_pos(sp.lo());
         let hi = self.lookup_char_pos(sp.hi());
         format!(
-            "{}:{}:{}: {}:{}",
+            "{}:{}:{}{}",
             lo.file.name.display(filename_display_pref),
             lo.line,
             lo.col.to_usize() + 1,
-            hi.line,
-            hi.col.to_usize() + 1,
+            if let FileNameDisplayPreference::Short = filename_display_pref {
+                String::new()
+            } else {
+                format!(": {}:{}", hi.line, hi.col.to_usize() + 1)
+            }
         )
     }
 
@@ -942,7 +948,7 @@ pub fn next_point(&self, sp: Span) -> Span {
     /// Otherwise, the span reached to limit is returned.
     pub fn span_look_ahead(&self, span: Span, expect: Option<&str>, limit: Option<usize>) -> Span {
         let mut sp = span;
-        for _ in 0..limit.unwrap_or(100 as usize) {
+        for _ in 0..limit.unwrap_or(100_usize) {
             sp = self.next_point(sp);
             if let Ok(ref snippet) = self.span_to_snippet(sp) {
                 if expect.map_or(false, |es| snippet == es) {
@@ -958,45 +964,40 @@ pub fn span_look_ahead(&self, span: Span, expect: Option<&str>, limit: Option<us
 
     /// Finds the width of the character, either before or after the end of provided span,
     /// depending on the `forwards` parameter.
+    #[instrument(skip(self, sp))]
     fn find_width_of_character_at_span(&self, sp: Span, forwards: bool) -> u32 {
         let sp = sp.data();
 
         if sp.lo == sp.hi && !forwards {
-            debug!("find_width_of_character_at_span: early return empty span");
+            debug!("early return empty span");
             return 1;
         }
 
         let local_begin = self.lookup_byte_offset(sp.lo);
         let local_end = self.lookup_byte_offset(sp.hi);
-        debug!(
-            "find_width_of_character_at_span: local_begin=`{:?}`, local_end=`{:?}`",
-            local_begin, local_end
-        );
+        debug!("local_begin=`{:?}`, local_end=`{:?}`", local_begin, local_end);
 
         if local_begin.sf.start_pos != local_end.sf.start_pos {
-            debug!("find_width_of_character_at_span: begin and end are in different files");
+            debug!("begin and end are in different files");
             return 1;
         }
 
         let start_index = local_begin.pos.to_usize();
         let end_index = local_end.pos.to_usize();
-        debug!(
-            "find_width_of_character_at_span: start_index=`{:?}`, end_index=`{:?}`",
-            start_index, end_index
-        );
+        debug!("start_index=`{:?}`, end_index=`{:?}`", start_index, end_index);
 
         // Disregard indexes that are at the start or end of their spans, they can't fit bigger
         // characters.
         if (!forwards && end_index == usize::MIN) || (forwards && start_index == usize::MAX) {
-            debug!("find_width_of_character_at_span: start or end of span, cannot be multibyte");
+            debug!("start or end of span, cannot be multibyte");
             return 1;
         }
 
         let source_len = (local_begin.sf.end_pos - local_begin.sf.start_pos).to_usize();
-        debug!("find_width_of_character_at_span: source_len=`{:?}`", source_len);
+        debug!("source_len=`{:?}`", source_len);
         // Ensure indexes are also not malformed.
         if start_index > end_index || end_index > source_len - 1 {
-            debug!("find_width_of_character_at_span: source indexes are malformed");
+            debug!("source indexes are malformed");
             return 1;
         }
 
@@ -1011,10 +1012,10 @@ fn find_width_of_character_at_span(&self, sp: Span, forwards: bool) -> u32 {
         } else {
             return 1;
         };
-        debug!("find_width_of_character_at_span: snippet=`{:?}`", snippet);
+        debug!("snippet=`{:?}`", snippet);
 
         let mut target = if forwards { end_index + 1 } else { end_index - 1 };
-        debug!("find_width_of_character_at_span: initial target=`{:?}`", target);
+        debug!("initial target=`{:?}`", target);
 
         while !snippet.is_char_boundary(target - start_index) && target < source_len {
             target = if forwards {
@@ -1027,9 +1028,9 @@ fn find_width_of_character_at_span(&self, sp: Span, forwards: bool) -> u32 {
                     }
                 }
             };
-            debug!("find_width_of_character_at_span: target=`{:?}`", target);
+            debug!("target=`{:?}`", target);
         }
-        debug!("find_width_of_character_at_span: final target=`{:?}`", target);
+        debug!("final target=`{:?}`", target);
 
         if forwards { (target - end_index) as u32 } else { (end_index - target) as u32 }
     }
@@ -1151,7 +1152,7 @@ fn remap_path_prefix(mapping: &[(PathBuf, PathBuf)], path: PathBuf) -> (PathBuf,
             // NOTE: We are iterating over the mapping entries from last to first
             //       because entries specified later on the command line should
             //       take precedence.
-            for &(ref from, ref to) in mapping.iter().rev() {
+            for (from, to) in mapping.iter().rev() {
                 debug!("Trying to apply {from:?} => {to:?}");
 
                 if let Ok(rest) = path.strip_prefix(from) {