bjoernager/rust
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Avoid adjusting file positions twice.

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`imported_source_files` adjusts lots of file positions, and then calls
`new_imported_source_file`, which then adjust them all again. This
commit combines the two adjustments into one, for a small perf win.
This commit is contained in:
Nicholas Nethercote 2022-05-25 14:01:18 +10:00
parent 3e810c64d0
commit 2b91c40c19
2 changed files with 18 additions and 29 deletions
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26
compiler/rustc_metadata/src/rmeta/decoder.rs
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@ -1639,10 +1639,10 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
src_hash,
start_pos,
end_pos,
mut lines,
mut multibyte_chars,
mut non_narrow_chars,
mut normalized_pos,
lines,
multibyte_chars,
non_narrow_chars,
normalized_pos,
name_hash,
..
} = source_file_to_import;
@ -1679,24 +1679,6 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
let source_length = (end_pos - start_pos).to_usize();
// Translate line-start positions and multibyte character
// position into frame of reference local to file.
// `SourceMap::new_imported_source_file()` will then translate those
// coordinates to their new global frame of reference when the
// offset of the SourceFile is known.
for pos in &mut lines {
*pos = *pos - start_pos;
}
for mbc in &mut multibyte_chars {
mbc.pos = mbc.pos - start_pos;
}
for swc in &mut non_narrow_chars {
*swc = *swc - start_pos;
}
for np in &mut normalized_pos {
np.pos = np.pos - start_pos;
}
let local_version = sess.source_map().new_imported_source_file(
name,
src_hash,