src/librustc/session/filesearch.rs

   1 // Copyright 2012-2014 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.
   4 //
   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.
  10
  11 #![allow(non_camel_case_types)]
  12
  13 pub use self::FileMatch::*;
  14
  15 use rustc_data_structures::fx::FxHashSet;
  16 use std::borrow::Cow;
  17 use std::env;
  18 use std::fs;
  19 use std::path::{Path, PathBuf};
  20
  21 use session::search_paths::{SearchPaths, PathKind};
  22 use rustc_fs_util::fix_windows_verbatim_for_gcc;
  23
  24 #[derive(Copy, Clone)]
  25 pub enum FileMatch {
  26     FileMatches,
  27     FileDoesntMatch,
  28 }
  29
  30 // A module for searching for libraries
  31
  32 pub struct FileSearch<'a> {
  33     pub sysroot: &'a Path,
  34     pub search_paths: &'a SearchPaths,
  35     pub triple: &'a str,
  36     pub kind: PathKind,
  37 }
  38
  39 impl<'a> FileSearch<'a> {
  40     pub fn for_each_lib_search_path<F>(&self, mut f: F) where
  41         F: FnMut(&Path, PathKind)
  42     {
  43         let mut visited_dirs = FxHashSet::default();
  44         visited_dirs.reserve(self.search_paths.paths.len() + 1);
  45         for (path, kind) in self.search_paths.iter(self.kind) {
  46             f(path, kind);
  47             visited_dirs.insert(path.to_path_buf());
  48         }
  49
  50         debug!("filesearch: searching lib path");
  51         let tlib_path = make_target_lib_path(self.sysroot,
  52                                              self.triple);
  53         if !visited_dirs.contains(&tlib_path) {
  54             f(&tlib_path, PathKind::All);
  55         }
  56
  57         visited_dirs.insert(tlib_path);
  58     }
  59
  60     pub fn get_lib_path(&self) -> PathBuf {
  61         make_target_lib_path(self.sysroot, self.triple)
  62     }
  63
  64     pub fn search<F>(&self, mut pick: F)
  65         where F: FnMut(&Path, PathKind) -> FileMatch
  66     {
  67         self.for_each_lib_search_path(|lib_search_path, kind| {
  68             debug!("searching {}", lib_search_path.display());
  69             let files = match fs::read_dir(lib_search_path) {
  70                 Ok(files) => files,
  71                 Err(..) => return,
  72             };
  73             let files = files.filter_map(|p| p.ok().map(|s| s.path()))
  74                              .collect::<Vec<_>>();
  75             fn is_rlib(p: &Path) -> bool {
  76                 p.extension() == Some("rlib".as_ref())
  77             }
  78             // Reading metadata out of rlibs is faster, and if we find both
  79             // an rlib and a dylib we only read one of the files of
  80             // metadata, so in the name of speed, bring all rlib files to
  81             // the front of the search list.
  82             let files1 = files.iter().filter(|p| is_rlib(p));
  83             let files2 = files.iter().filter(|p| !is_rlib(p));
  84             for path in files1.chain(files2) {
  85                 debug!("testing {}", path.display());
  86                 let maybe_picked = pick(path, kind);
  87                 match maybe_picked {
  88                     FileMatches => {
  89                         debug!("picked {}", path.display());
  90                     }
  91                     FileDoesntMatch => {
  92                         debug!("rejected {}", path.display());
  93                     }
  94                 }
  95             }
  96         });
  97     }
  98
  99     pub fn new(sysroot: &'a Path,
 100                triple: &'a str,
 101                search_paths: &'a SearchPaths,
 102                kind: PathKind) -> FileSearch<'a> {
 103         debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
 104         FileSearch {
 105             sysroot,
 106             search_paths,
 107             triple,
 108             kind,
 109         }
 110     }
 111
 112     // Returns a list of directories where target-specific dylibs might be located.
 113     pub fn get_dylib_search_paths(&self) -> Vec<PathBuf> {
 114         let mut paths = Vec::new();
 115         self.for_each_lib_search_path(|lib_search_path, _| {
 116             paths.push(lib_search_path.to_path_buf());
 117         });
 118         paths
 119     }
 120
 121     // Returns a list of directories where target-specific tool binaries are located.
 122     pub fn get_tools_search_paths(&self) -> Vec<PathBuf> {
 123         let mut p = PathBuf::from(self.sysroot);
 124         p.push(find_libdir(self.sysroot).as_ref());
 125         p.push(RUST_LIB_DIR);
 126         p.push(&self.triple);
 127         p.push("bin");
 128         vec![p]
 129     }
 130 }
 131
 132 pub fn relative_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
 133     let mut p = PathBuf::from(find_libdir(sysroot).as_ref());
 134     assert!(p.is_relative());
 135     p.push(RUST_LIB_DIR);
 136     p.push(target_triple);
 137     p.push("lib");
 138     p
 139 }
 140
 141 fn make_target_lib_path(sysroot: &Path,
 142                         target_triple: &str) -> PathBuf {
 143     sysroot.join(&relative_target_lib_path(sysroot, target_triple))
 144 }
 145
 146 pub fn get_or_default_sysroot() -> PathBuf {
 147     // Follow symlinks.  If the resolved path is relative, make it absolute.
 148     fn canonicalize(path: Option<PathBuf>) -> Option<PathBuf> {
 149         path.and_then(|path| {
 150             match fs::canonicalize(&path) {
 151                 // See comments on this target function, but the gist is that
 152                 // gcc chokes on verbatim paths which fs::canonicalize generates
 153                 // so we try to avoid those kinds of paths.
 154                 Ok(canon) => Some(fix_windows_verbatim_for_gcc(&canon)),
 155                 Err(e) => bug!("failed to get realpath: {}", e),
 156             }
 157         })
 158     }
 159
 160     match env::current_exe() {
 161         Ok(exe) => {
 162             match canonicalize(Some(exe)) {
 163                 Some(mut p) => { p.pop(); p.pop(); p },
 164                 None => bug!("can't determine value for sysroot")
 165             }
 166         }
 167         Err(ref e) => panic!(format!("failed to get current_exe: {}", e))
 168     }
 169 }
 170
 171 // The name of the directory rustc expects libraries to be located.
 172 fn find_libdir(sysroot: &Path) -> Cow<'static, str> {
 173     // FIXME: This is a quick hack to make the rustc binary able to locate
 174     // Rust libraries in Linux environments where libraries might be installed
 175     // to lib64/lib32. This would be more foolproof by basing the sysroot off
 176     // of the directory where librustc is located, rather than where the rustc
 177     // binary is.
 178     // If --libdir is set during configuration to the value other than
 179     // "lib" (i.e. non-default), this value is used (see issue #16552).
 180
 181     #[cfg(target_pointer_width = "64")]
 182     const PRIMARY_LIB_DIR: &'static str = "lib64";
 183
 184     #[cfg(target_pointer_width = "32")]
 185     const PRIMARY_LIB_DIR: &'static str = "lib32";
 186
 187     const SECONDARY_LIB_DIR: &'static str = "lib";
 188
 189     match option_env!("CFG_LIBDIR_RELATIVE") {
 190         Some(libdir) if libdir != "lib" => libdir.into(),
 191         _ => if sysroot.join(PRIMARY_LIB_DIR).join(RUST_LIB_DIR).exists() {
 192             PRIMARY_LIB_DIR.into()
 193         } else {
 194             SECONDARY_LIB_DIR.into()
 195         }
 196     }
 197 }
 198
 199 // The name of rustc's own place to organize libraries.
 200 // Used to be "rustc", now the default is "rustlib"
 201 const RUST_LIB_DIR: &'static str = "rustlib";