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Remove new allocations from imported_source_files #99677

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Jul 26, 2022
Merged

Remove new allocations from imported_source_files #99677

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40 changes: 20 additions & 20 deletions compiler/rustc_metadata/src/rmeta/decoder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ use std::io;
use std::iter::TrustedLen;
use std::mem;
use std::num::NonZeroUsize;
use std::path::PathBuf;
use std::path::Path;
use tracing::debug;

pub(super) use cstore_impl::provide;
Expand Down Expand Up @@ -1474,30 +1474,30 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
/// Proc macro crates don't currently export spans, so this function does not have
/// to work for them.
fn imported_source_files(self, sess: &Session) -> &'a [ImportedSourceFile] {
fn filter<'a>(sess: &Session, path: Option<&'a Path>) -> Option<&'a Path> {
path.filter(|_| {
// Only spend time on further checks if we have what to translate *to*.
sess.opts.real_rust_source_base_dir.is_some()
// Some tests need the translation to be always skipped.
&& sess.opts.unstable_opts.translate_remapped_path_to_local_path
})
.filter(|virtual_dir| {
// Don't translate away `/rustc/$hash` if we're still remapping to it,
// since that means we're still building `std`/`rustc` that need it,
// and we don't want the real path to leak into codegen/debuginfo.
!sess.opts.remap_path_prefix.iter().any(|(_from, to)| to == virtual_dir)
})
}

// Translate the virtual `/rustc/$hash` prefix back to a real directory
// that should hold actual sources, where possible.
//
// NOTE: if you update this, you might need to also update bootstrap's code for generating
// the `rust-src` component in `Src::run` in `src/bootstrap/dist.rs`.
let virtual_rust_source_base_dir = [
option_env!("CFG_VIRTUAL_RUST_SOURCE_BASE_DIR").map(PathBuf::from),
sess.opts.unstable_opts.simulate_remapped_rust_src_base.clone(),
]
.into_iter()
.filter(|_| {
// Only spend time on further checks if we have what to translate *to*.
sess.opts.real_rust_source_base_dir.is_some()
// Some tests need the translation to be always skipped.
&& sess.opts.unstable_opts.translate_remapped_path_to_local_path
})
.flatten()
.filter(|virtual_dir| {
// Don't translate away `/rustc/$hash` if we're still remapping to it,
// since that means we're still building `std`/`rustc` that need it,
// and we don't want the real path to leak into codegen/debuginfo.
!sess.opts.remap_path_prefix.iter().any(|(_from, to)| to == virtual_dir)
})
.collect::<Vec<_>>();
filter(sess, option_env!("CFG_VIRTUAL_RUST_SOURCE_BASE_DIR").map(Path::new)),
filter(sess, sess.opts.unstable_opts.simulate_remapped_rust_src_base.as_deref()),
];

let try_to_translate_virtual_to_real = |name: &mut rustc_span::FileName| {
debug!(
Expand All @@ -1506,7 +1506,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
name, virtual_rust_source_base_dir, sess.opts.real_rust_source_base_dir,
);

for virtual_dir in &virtual_rust_source_base_dir {
for virtual_dir in virtual_rust_source_base_dir.iter().flatten() {
if let Some(real_dir) = &sess.opts.real_rust_source_base_dir {
if let rustc_span::FileName::Real(old_name) = name {
if let rustc_span::RealFileName::Remapped { local_path: _, virtual_name } =
Expand Down