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//! Functions for saving and removing intermediate [work products].
//!
//! [work products]: WorkProduct
use crate::persist::fs::*;
use rustc_data_structures::fx::FxHashMap;
use rustc_fs_util::link_or_copy;
use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
use rustc_session::Session;
use std::fs as std_fs;
use std::path::Path;
/// Copies a CGU work product to the incremental compilation directory, so next compilation can find and reuse it.
pub fn copy_cgu_workproduct_to_incr_comp_cache_dir(
sess: &Session,
cgu_name: &str,
files: &[(&'static str, &Path)],
) -> Option<(WorkProductId, WorkProduct)> {
debug!(?cgu_name, ?files);
sess.opts.incremental.as_ref()?;
let mut saved_files = FxHashMap::default();
for (ext, path) in files {
let file_name = format!("{cgu_name}.{ext}");
let path_in_incr_dir = in_incr_comp_dir_sess(sess, &file_name);
match link_or_copy(path, &path_in_incr_dir) {
Ok(_) => {
let _ = saved_files.insert(ext.to_string(), file_name);
}
Err(err) => {
sess.warn(&format!(
"error copying object file `{}` to incremental directory as `{}`: {}",
path.display(),
path_in_incr_dir.display(),
err
));
}
}
}
let work_product = WorkProduct { cgu_name: cgu_name.to_string(), saved_files };
debug!(?work_product);
let work_product_id = WorkProductId::from_cgu_name(cgu_name);
Some((work_product_id, work_product))
}
/// Removes files for a given work product.
pub fn delete_workproduct_files(sess: &Session, work_product: &WorkProduct) {
for (_, path) in &work_product.saved_files {
let path = in_incr_comp_dir_sess(sess, path);
if let Err(err) = std_fs::remove_file(&path) {
sess.warn(&format!(
"file-system error deleting outdated file `{}`: {}",
path.display(),
err
));
}
}
}
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