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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use rustc::middle::cstore::LOCAL_CRATE;
use rustc::ty::TyCtxt;
use std::fs;
use std::io;
use std::path::{Path, PathBuf};
use syntax::ast;
pub fn dep_graph_path(tcx: TyCtxt) -> Option<PathBuf> {
path(tcx, LOCAL_CRATE, "local")
}
pub fn metadata_hash_path(tcx: TyCtxt, cnum: ast::CrateNum) -> Option<PathBuf> {
path(tcx, cnum, "metadata")
}
fn path(tcx: TyCtxt, cnum: ast::CrateNum, suffix: &str) -> Option<PathBuf> {
// For now, just save/load dep-graph from
// directory/dep_graph.rbml
tcx.sess.opts.incremental.as_ref().and_then(|incr_dir| {
match create_dir_racy(&incr_dir) {
Ok(()) => {}
Err(err) => {
tcx.sess.err(
&format!("could not create the directory `{}`: {}",
incr_dir.display(), err));
return None;
}
}
let crate_name = tcx.crate_name(cnum);
let crate_disambiguator = tcx.crate_disambiguator(cnum);
let file_name = format!("{}-{}.{}.bin",
crate_name,
crate_disambiguator,
suffix);
Some(incr_dir.join(file_name))
})
}
// Like std::fs::create_dir_all, except handles concurrent calls among multiple
// threads or processes.
fn create_dir_racy(path: &Path) -> io::Result<()> {
match fs::create_dir(path) {
Ok(()) => return Ok(()),
Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => return Ok(()),
Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
Err(e) => return Err(e),
}
match path.parent() {
Some(p) => try!(create_dir_racy(p)),
None => return Err(io::Error::new(io::ErrorKind::Other,
"failed to create whole tree")),
}
match fs::create_dir(path) {
Ok(()) => Ok(()),
Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => Ok(()),
Err(e) => Err(e),
}
}
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