src/librustc_incremental/persist/work_product.rs

   1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! This module contains files for saving intermediate work-products.
  12
  13 use persist::fs::*;
  14 use rustc::dep_graph::{WorkProduct, WorkProductId, DepGraph};
  15 use rustc::session::Session;
  16 use rustc::session::config::OutputType;
  17 use rustc::util::fs::link_or_copy;
  18 use std::path::PathBuf;
  19 use std::fs as std_fs;
  20
  21 pub fn save_trans_partition(sess: &Session,
  22                             dep_graph: &DepGraph,
  23                             cgu_name: &str,
  24                             files: &[(OutputType, PathBuf)]) {
  25     debug!("save_trans_partition({:?},{:?})",
  26            cgu_name,
  27            files);
  28     if sess.opts.incremental.is_none() {
  29         return;
  30     }
  31     let work_product_id = WorkProductId::from_cgu_name(cgu_name);
  32
  33     let saved_files: Option<Vec<_>> =
  34         files.iter()
  35              .map(|&(kind, ref path)| {
  36                  let file_name = format!("cgu-{}.{}", cgu_name, kind.extension());
  37                  let path_in_incr_dir = in_incr_comp_dir_sess(sess, &file_name);
  38                  match link_or_copy(path, &path_in_incr_dir) {
  39                      Ok(_) => Some((kind, file_name)),
  40                      Err(err) => {
  41                          sess.warn(&format!("error copying object file `{}` \
  42                                              to incremental directory as `{}`: {}",
  43                                             path.display(),
  44                                             path_in_incr_dir.display(),
  45                                             err));
  46                          None
  47                      }
  48                  }
  49              })
  50              .collect();
  51     let saved_files = match saved_files {
  52         Some(v) => v,
  53         None => return,
  54     };
  55
  56     let work_product = WorkProduct {
  57         cgu_name: cgu_name.to_string(),
  58         saved_files,
  59     };
  60
  61     dep_graph.insert_work_product(&work_product_id, work_product);
  62 }
  63
  64 pub fn delete_workproduct_files(sess: &Session, work_product: &WorkProduct) {
  65     for &(_, ref file_name) in &work_product.saved_files {
  66         let path = in_incr_comp_dir_sess(sess, file_name);
  67         match std_fs::remove_file(&path) {
  68             Ok(()) => { }
  69             Err(err) => {
  70                 sess.warn(
  71                     &format!("file-system error deleting outdated file `{}`: {}",
  72                              path.display(), err));
  73             }
  74         }
  75     }
  76 }