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::{Path, PathBuf};
19 pub fn dep_graph_path(tcx: TyCtxt) -> Option<PathBuf> {
20 path(tcx, LOCAL_CRATE, "local")
23 pub fn metadata_hash_path(tcx: TyCtxt, cnum: ast::CrateNum) -> Option<PathBuf> {
24 path(tcx, cnum, "metadata")
27 fn path(tcx: TyCtxt, cnum: ast::CrateNum, suffix: &str) -> Option<PathBuf> {
28 // For now, just save/load dep-graph from
29 // directory/dep_graph.rbml
30 tcx.sess.opts.incremental.as_ref().and_then(|incr_dir| {
31 match create_dir_racy(&incr_dir) {
35 &format!("could not create the directory `{}`: {}",
36 incr_dir.display(), err));
41 let crate_name = tcx.crate_name(cnum);
42 let crate_disambiguator = tcx.crate_disambiguator(cnum);
43 let file_name = format!("{}-{}.{}.bin",
47 Some(incr_dir.join(file_name))
51 // Like std::fs::create_dir_all, except handles concurrent calls among multiple
52 // threads or processes.
53 fn create_dir_racy(path: &Path) -> io::Result<()> {
54 match fs::create_dir(path) {
55 Ok(()) => return Ok(()),
56 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => return Ok(()),
57 Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
58 Err(e) => return Err(e),
61 Some(p) => try!(create_dir_racy(p)),
62 None => return Err(io::Error::new(io::ErrorKind::Other,
63 "failed to create whole tree")),
65 match fs::create_dir(path) {
67 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => Ok(()),