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Improve debug logs of find_width_of_character_at_span

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This commit is contained in:
Nilstrieb 2022-12-27 21:24:35 +01:00
parent a1fc71196a
commit 1322e476bf
1 changed files with 12 additions and 17 deletions
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29
compiler/rustc_span/src/source_map.rs
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@ -964,45 +964,40 @@ impl SourceMap {
/// 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;
}
@ -1017,10 +1012,10 @@ impl SourceMap {
} 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 {
@ -1033,9 +1028,9 @@ impl SourceMap {
}
}
};
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 }
}