1 // Copyright 2014 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.
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.
11 use rustc::ty::TyCtxt;
15 use std::path::{PathBuf, Path};
17 pub fn dep_graph_path(tcx: TyCtxt) -> Option<PathBuf> {
18 // For now, just save/load dep-graph from
19 // directory/dep_graph.rbml
20 tcx.sess.opts.incremental.as_ref().and_then(|incr_dir| {
21 match create_dir_racy(&incr_dir) {
25 &format!("could not create the directory `{}`: {}",
26 incr_dir.display(), err));
31 Some(incr_dir.join("dep_graph.rbml"))
35 // Like std::fs::create_dir_all, except handles concurrent calls among multiple
36 // threads or processes.
37 fn create_dir_racy(path: &Path) -> io::Result<()> {
38 match fs::create_dir(path) {
39 Ok(()) => return Ok(()),
40 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => return Ok(()),
41 Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
42 Err(e) => return Err(e),
45 Some(p) => try!(create_dir_racy(p)),
46 None => return Err(io::Error::new(io::ErrorKind::Other,
47 "failed to create whole tree")),
49 match fs::create_dir(path) {
51 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => Ok(()),