compiler/rustc_incremental/src/persist/work_product.rs

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  50                     "file-system error deleting outdated file `{}`: {}",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