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::middle::cstore::LOCAL_CRATE;
12 use rustc::ty::TyCtxt;
16 use std::path::{PathBuf, Path};
18 pub fn dep_graph_path(tcx: TyCtxt) -> Option<PathBuf> {
19 // For now, just save/load dep-graph from
20 // directory/dep_graph.rbml
21 tcx.sess.opts.incremental.as_ref().and_then(|incr_dir| {
22 match create_dir_racy(&incr_dir) {
26 &format!("could not create the directory `{}`: {}",
27 incr_dir.display(), err));
32 let crate_name = tcx.crate_name(LOCAL_CRATE);
33 let crate_disambiguator = tcx.crate_disambiguator(LOCAL_CRATE);
34 let file_name = format!("dep-graph-{}-{}.bin",
37 Some(incr_dir.join(file_name))
41 // Like std::fs::create_dir_all, except handles concurrent calls among multiple
42 // threads or processes.
43 fn create_dir_racy(path: &Path) -> io::Result<()> {
44 match fs::create_dir(path) {
45 Ok(()) => return Ok(()),
46 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => return Ok(()),
47 Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
48 Err(e) => return Err(e),
51 Some(p) => try!(create_dir_racy(p)),
52 None => return Err(io::Error::new(io::ErrorKind::Other,
53 "failed to create whole tree")),
55 match fs::create_dir(path) {
57 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => Ok(()),