src/librustc_incremental/persist/work_product.rs

   1 //! This module contains files for saving intermediate work-products.
   2
   3 use crate::persist::fs::*;
   4 use rustc::dep_graph::{WorkProduct, WorkProductFileKind, WorkProductId};
   5 use rustc::session::Session;
   6 use rustc_fs_util::link_or_copy;
   7 use std::fs as std_fs;
   8 use std::path::PathBuf;
   9
  10 pub fn copy_cgu_workproducts_to_incr_comp_cache_dir(
  11     sess: &Session,
  12     cgu_name: &str,
  13     files: &[(WorkProductFileKind, PathBuf)],
  14 ) -> Option<(WorkProductId, WorkProduct)> {
  15     debug!("copy_cgu_workproducts_to_incr_comp_cache_dir({:?},{:?})", cgu_name, files);
  16     if sess.opts.incremental.is_none() {
  17         return None;
  18     }
  19
  20     let saved_files = files
  21         .iter()
  22         .map(|&(kind, ref path)| {
  23             let extension = match kind {
  24                 WorkProductFileKind::Object => "o",
  25                 WorkProductFileKind::Bytecode => "bc",
  26                 WorkProductFileKind::BytecodeCompressed => "bc.z",
  27             };
  28             let file_name = format!("{}.{}", cgu_name, extension);
  29             let path_in_incr_dir = in_incr_comp_dir_sess(sess, &file_name);
  30             match link_or_copy(path, &path_in_incr_dir) {
  31                 Ok(_) => Some((kind, file_name)),
  32                 Err(err) => {
  33                     sess.warn(&format!(
  34                         "error copying object file `{}` \
  35                                              to incremental directory as `{}`: {}",
  36                         path.display(),
  37                         path_in_incr_dir.display(),
  38                         err
  39                     ));
  40                     None
  41                 }
  42             }
  43         })
  44         .collect::<Option<Vec<_>>>()?;
  45
  46     let work_product = WorkProduct { cgu_name: cgu_name.to_string(), saved_files };
  47
  48     let work_product_id = WorkProductId::from_cgu_name(cgu_name);
  49     Some((work_product_id, work_product))
  50 }
  51
  52 pub fn delete_workproduct_files(sess: &Session, work_product: &WorkProduct) {
  53     for &(_, ref file_name) in &work_product.saved_files {
  54         let path = in_incr_comp_dir_sess(sess, file_name);
  55         match std_fs::remove_file(&path) {
  56             Ok(()) => {}
  57             Err(err) => {
  58                 sess.warn(&format!(
  59                     "file-system error deleting outdated file `{}`: {}",
  60                     path.display(),
  61                     err
  62                 ));
  63             }
  64         }
  65     }
  66 }