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filesearch.rs
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filesearch.rs
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// Copyright 2012-2014 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.
#![allow(non_camel_case_types)]
pub use self::FileMatch::*;
use rustc_data_structures::fx::FxHashSet;
use std::borrow::Cow;
use std::env;
use std::fs;
use std::path::{Path, PathBuf};
use session::search_paths::{SearchPaths, PathKind};
use rustc_fs_util::fix_windows_verbatim_for_gcc;
#[derive(Copy, Clone)]
pub enum FileMatch {
FileMatches,
FileDoesntMatch,
}
// A module for searching for libraries
pub struct FileSearch<'a> {
pub sysroot: &'a Path,
pub search_paths: &'a SearchPaths,
pub triple: &'a str,
pub kind: PathKind,
}
impl<'a> FileSearch<'a> {
pub fn for_each_lib_search_path<F>(&self, mut f: F) where
F: FnMut(&Path, PathKind)
{
let mut visited_dirs = FxHashSet::default();
for (path, kind) in self.search_paths.iter(self.kind) {
f(path, kind);
visited_dirs.insert(path.to_path_buf());
}
debug!("filesearch: searching lib path");
let tlib_path = make_target_lib_path(self.sysroot,
self.triple);
if !visited_dirs.contains(&tlib_path) {
f(&tlib_path, PathKind::All);
}
visited_dirs.insert(tlib_path);
}
pub fn get_lib_path(&self) -> PathBuf {
make_target_lib_path(self.sysroot, self.triple)
}
pub fn search<F>(&self, mut pick: F)
where F: FnMut(&Path, PathKind) -> FileMatch
{
self.for_each_lib_search_path(|lib_search_path, kind| {
debug!("searching {}", lib_search_path.display());
let files = match fs::read_dir(lib_search_path) {
Ok(files) => files,
Err(..) => return,
};
let files = files.filter_map(|p| p.ok().map(|s| s.path()))
.collect::<Vec<_>>();
fn is_rlib(p: &Path) -> bool {
p.extension() == Some("rlib".as_ref())
}
// Reading metadata out of rlibs is faster, and if we find both
// an rlib and a dylib we only read one of the files of
// metadata, so in the name of speed, bring all rlib files to
// the front of the search list.
let files1 = files.iter().filter(|p| is_rlib(p));
let files2 = files.iter().filter(|p| !is_rlib(p));
for path in files1.chain(files2) {
debug!("testing {}", path.display());
let maybe_picked = pick(path, kind);
match maybe_picked {
FileMatches => {
debug!("picked {}", path.display());
}
FileDoesntMatch => {
debug!("rejected {}", path.display());
}
}
}
});
}
pub fn new(sysroot: &'a Path,
triple: &'a str,
search_paths: &'a SearchPaths,
kind: PathKind) -> FileSearch<'a> {
debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
FileSearch {
sysroot,
search_paths,
triple,
kind,
}
}
// Returns a list of directories where target-specific dylibs might be located.
pub fn get_dylib_search_paths(&self) -> Vec<PathBuf> {
let mut paths = Vec::new();
self.for_each_lib_search_path(|lib_search_path, _| {
paths.push(lib_search_path.to_path_buf());
});
paths
}
// Returns a list of directories where target-specific tool binaries are located.
pub fn get_tools_search_paths(&self) -> Vec<PathBuf> {
let mut p = PathBuf::from(self.sysroot);
p.push(find_libdir(self.sysroot).as_ref());
p.push(RUST_LIB_DIR);
p.push(&self.triple);
p.push("bin");
vec![p]
}
}
pub fn relative_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
let mut p = PathBuf::from(find_libdir(sysroot).as_ref());
assert!(p.is_relative());
p.push(RUST_LIB_DIR);
p.push(target_triple);
p.push("lib");
p
}
fn make_target_lib_path(sysroot: &Path,
target_triple: &str) -> PathBuf {
sysroot.join(&relative_target_lib_path(sysroot, target_triple))
}
pub fn get_or_default_sysroot() -> PathBuf {
// Follow symlinks. If the resolved path is relative, make it absolute.
fn canonicalize(path: Option<PathBuf>) -> Option<PathBuf> {
path.and_then(|path| {
match fs::canonicalize(&path) {
// See comments on this target function, but the gist is that
// gcc chokes on verbatim paths which fs::canonicalize generates
// so we try to avoid those kinds of paths.
Ok(canon) => Some(fix_windows_verbatim_for_gcc(&canon)),
Err(e) => bug!("failed to get realpath: {}", e),
}
})
}
match env::current_exe() {
Ok(exe) => {
match canonicalize(Some(exe)) {
Some(mut p) => { p.pop(); p.pop(); return p; },
None => bug!("can't determine value for sysroot")
}
}
Err(ref e) => panic!(format!("failed to get current_exe: {}", e))
}
}
// The name of the directory rustc expects libraries to be located.
fn find_libdir(sysroot: &Path) -> Cow<'static, str> {
// FIXME: This is a quick hack to make the rustc binary able to locate
// Rust libraries in Linux environments where libraries might be installed
// to lib64/lib32. This would be more foolproof by basing the sysroot off
// of the directory where librustc is located, rather than where the rustc
// binary is.
//If --libdir is set during configuration to the value other than
// "lib" (i.e. non-default), this value is used (see issue #16552).
match option_env!("CFG_LIBDIR_RELATIVE") {
Some(libdir) if libdir != "lib" => return libdir.into(),
_ => if sysroot.join(PRIMARY_LIB_DIR).join(RUST_LIB_DIR).exists() {
return PRIMARY_LIB_DIR.into();
} else {
return SECONDARY_LIB_DIR.into();
}
}
#[cfg(target_pointer_width = "64")]
const PRIMARY_LIB_DIR: &'static str = "lib64";
#[cfg(target_pointer_width = "32")]
const PRIMARY_LIB_DIR: &'static str = "lib32";
const SECONDARY_LIB_DIR: &'static str = "lib";
}
// The name of rustc's own place to organize libraries.
// Used to be "rustc", now the default is "rustlib"
const RUST_LIB_DIR: &'static str = "rustlib";