| // 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), |
| } |
| } |
| |