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rustc_span: refactor byte_pos_to_line_and_col

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This commit is contained in:
Tyson Nottingham 2020-09-20 17:40:48 -07:00
parent 8da2a5a27c
commit 0987b84198
1 changed files with 32 additions and 29 deletions
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61
compiler/rustc_span/src/caching_source_map_view.rs
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@ -70,38 +70,16 @@ impl<'sm> CachingSourceMapView<'sm> {
}
// No cache hit ...
let mut oldest = 0;
for index in 1..self.line_cache.len() {
if self.line_cache[index].time_stamp < self.line_cache[oldest].time_stamp {
oldest = index;
}
let oldest = self.oldest_cache_entry_index();
// If the entry doesn't point to the correct file, fix it up
if !file_contains(&self.line_cache[oldest].file, pos) {
let (file, file_index) = self.file_for_position(pos)?;
self.line_cache[oldest].file = file;
self.line_cache[oldest].file_index = file_index;
}
let cache_entry = &mut self.line_cache[oldest];
// If the entry doesn't point to the correct file, fix it up
if !file_contains(&cache_entry.file, pos) {
let file_valid;
if self.source_map.files().len() > 0 {
let file_index = self.source_map.lookup_source_file_idx(pos);
let file = &self.source_map.files()[file_index];
if file_contains(&file, pos) {
cache_entry.file = file.clone();
cache_entry.file_index = file_index;
file_valid = true;
} else {
file_valid = false;
}
} else {
file_valid = false;
}
if !file_valid {
return None;
}
}
let line_index = cache_entry.file.lookup_line(pos).unwrap();
let line_bounds = cache_entry.file.line_bounds(line_index);
@ -111,6 +89,31 @@ impl<'sm> CachingSourceMapView<'sm> {
Some((cache_entry.file.clone(), cache_entry.line_number, pos - cache_entry.line.start))
}
fn oldest_cache_entry_index(&self) -> usize {
let mut oldest = 0;
for idx in 1..self.line_cache.len() {
if self.line_cache[idx].time_stamp < self.line_cache[oldest].time_stamp {
oldest = idx;
}
}
oldest
}
fn file_for_position(&self, pos: BytePos) -> Option<(Lrc<SourceFile>, usize)> {
if !self.source_map.files().is_empty() {
let file_idx = self.source_map.lookup_source_file_idx(pos);
let file = &self.source_map.files()[file_idx];
if file_contains(file, pos) {
return Some((file.clone(), file_idx));
}
}
None
}
}
#[inline]