compiler/rustc_incremental/src/persist/work_product.rs

   1 //! Functions for saving and removing intermediate [work products].
   2 //!
   3 //! [work products]: WorkProduct
   4
   5 use crate::persist::fs::*;
   6 use rustc_fs_util::link_or_copy;
   7 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
   8 use rustc_session::Session;
   9 use std::fs as std_fs;
  10 use std::path::PathBuf;
  11
  12 /// Copies a CGU work product to the incremental compilation directory, so next compilation can find and reuse it.
  13 pub fn copy_cgu_workproduct_to_incr_comp_cache_dir(
  14     sess: &Session,
  15     cgu_name: &str,
  16     path: &Option<PathBuf>,
  17 ) -> Option<(WorkProductId, WorkProduct)> {
  18     debug!("copy_cgu_workproduct_to_incr_comp_cache_dir({:?},{:?})", cgu_name, path);
  19     sess.opts.incremental.as_ref()?;
  20
  21     let saved_file = if let Some(path) = path {
  22         let file_name = format!("{}.o", cgu_name);
  23         let path_in_incr_dir = in_incr_comp_dir_sess(sess, &file_name);
  24         match link_or_copy(path, &path_in_incr_dir) {
  25             Ok(_) => Some(file_name),
  26             Err(err) => {
  27                 sess.warn(&format!(
  28                     "error copying object file `{}` to incremental directory as `{}`: {}",
  29                     path.display(),
  30                     path_in_incr_dir.display(),
  31                     err
  32                 ));
  33                 return None;
  34             }
  35         }
  36     } else {
  37         None
  38     };
  39
  40     let work_product = WorkProduct { cgu_name: cgu_name.to_string(), saved_file };
  41
  42     let work_product_id = WorkProductId::from_cgu_name(cgu_name);
  43     Some((work_product_id, work_product))
  44 }
  45
  46 /// Removes files for a given work product.
  47 pub fn delete_workproduct_files(sess: &Session, work_product: &WorkProduct) {
  48     if let Some(ref file_name) = work_product.saved_file {
  49         let path = in_incr_comp_dir_sess(sess, file_name);
  50         match std_fs::remove_file(&path) {
  51             Ok(()) => {}
  52             Err(err) => {
  53                 sess.warn(&format!(
  54                     "file-system error deleting outdated file `{}`: {}",
  55                     path.display(),
  56                     err
  57                 ));
  58             }
  59         }
  60     }
  61 }