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outline heavyweight closure that caused regressions in rust-lang#86898
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@the8472
the8472 committed Sep 16, 2021
1 parent 237bb5e commit d878815
Showing 1 changed file with 95 additions and 92 deletions.
187 changes: 95 additions & 92 deletions compiler/rustc_metadata/src/rmeta/decoder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1766,108 +1766,111 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
}
};

self.cdata.source_map_import_info.get_or_init(|| {
let external_source_map = self.root.source_map.decode(self);

external_source_map
.map(|source_file_to_import| {
// We can't reuse an existing SourceFile, so allocate a new one
// containing the information we need.
let rustc_span::SourceFile {
mut name,
src_hash,
start_pos,
end_pos,
mut lines,
mut multibyte_chars,
mut non_narrow_chars,
mut normalized_pos,
name_hash,
..
} = source_file_to_import;

// If this file is under $sysroot/lib/rustlib/src/ but has not been remapped
// during rust bootstrapping by `remap-debuginfo = true`, and the user
// wish to simulate that behaviour by -Z simulate-remapped-rust-src-base,
// then we change `name` to a similar state as if the rust was bootstrapped
// with `remap-debuginfo = true`.
// This is useful for testing so that tests about the effects of
// `try_to_translate_virtual_to_real` don't have to worry about how the
// compiler is bootstrapped.
if let Some(virtual_dir) =
&sess.opts.debugging_opts.simulate_remapped_rust_src_base
{
if let Some(real_dir) = &sess.opts.real_rust_source_base_dir {
if let rustc_span::FileName::Real(ref mut old_name) = name {
if let rustc_span::RealFileName::LocalPath(local) = old_name {
if let Ok(rest) = local.strip_prefix(real_dir) {
*old_name = rustc_span::RealFileName::Remapped {
local_path: None,
virtual_name: virtual_dir.join(rest),
};
self.cdata.source_map_import_info.get_or_init(
#[inline(never)]
|| {
let external_source_map = self.root.source_map.decode(self);

external_source_map
.map(|source_file_to_import| {
// We can't reuse an existing SourceFile, so allocate a new one
// containing the information we need.
let rustc_span::SourceFile {
mut name,
src_hash,
start_pos,
end_pos,
mut lines,
mut multibyte_chars,
mut non_narrow_chars,
mut normalized_pos,
name_hash,
..
} = source_file_to_import;

// If this file is under $sysroot/lib/rustlib/src/ but has not been remapped
// during rust bootstrapping by `remap-debuginfo = true`, and the user
// wish to simulate that behaviour by -Z simulate-remapped-rust-src-base,
// then we change `name` to a similar state as if the rust was bootstrapped
// with `remap-debuginfo = true`.
// This is useful for testing so that tests about the effects of
// `try_to_translate_virtual_to_real` don't have to worry about how the
// compiler is bootstrapped.
if let Some(virtual_dir) =
&sess.opts.debugging_opts.simulate_remapped_rust_src_base
{
if let Some(real_dir) = &sess.opts.real_rust_source_base_dir {
if let rustc_span::FileName::Real(ref mut old_name) = name {
if let rustc_span::RealFileName::LocalPath(local) = old_name {
if let Ok(rest) = local.strip_prefix(real_dir) {
*old_name = rustc_span::RealFileName::Remapped {
local_path: None,
virtual_name: virtual_dir.join(rest),
};
}
}
}
}
}
}

// If this file's path has been remapped to `/rustc/$hash`,
// we might be able to reverse that (also see comments above,
// on `try_to_translate_virtual_to_real`).
try_to_translate_virtual_to_real(&mut name);
// If this file's path has been remapped to `/rustc/$hash`,
// we might be able to reverse that (also see comments above,
// on `try_to_translate_virtual_to_real`).
try_to_translate_virtual_to_real(&mut name);

let source_length = (end_pos - start_pos).to_usize();
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;
}
// 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,
name_hash,
source_length,
self.cnum,
lines,
multibyte_chars,
non_narrow_chars,
normalized_pos,
start_pos,
end_pos,
);
debug!(
"CrateMetaData::imported_source_files alloc \
let local_version = sess.source_map().new_imported_source_file(
name,
src_hash,
name_hash,
source_length,
self.cnum,
lines,
multibyte_chars,
non_narrow_chars,
normalized_pos,
start_pos,
end_pos,
);
debug!(
"CrateMetaData::imported_source_files alloc \
source_file {:?} original (start_pos {:?} end_pos {:?}) \
translated (start_pos {:?} end_pos {:?})",
local_version.name,
start_pos,
end_pos,
local_version.start_pos,
local_version.end_pos
);

ImportedSourceFile {
original_start_pos: start_pos,
original_end_pos: end_pos,
translated_source_file: local_version,
}
})
.collect()
})
local_version.name,
start_pos,
end_pos,
local_version.start_pos,
local_version.end_pos
);

ImportedSourceFile {
original_start_pos: start_pos,
original_end_pos: end_pos,
translated_source_file: local_version,
}
})
.collect()
},
)
}
}

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