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1 #![allow(non_camel_case_types)]
2
3 pub use self::FileMatch::*;
4
5 use std::borrow::Cow;
6 use std::env;
7 use std::fs;
8 use std::path::{Path, PathBuf};
9
10 use crate::search_paths::{PathKind, SearchPath, SearchPathFile};
11 use log::debug;
12 use rustc_fs_util::fix_windows_verbatim_for_gcc;
13
14 #[derive(Copy, Clone)]
15 pub enum FileMatch {
16 FileMatches,
17 FileDoesntMatch,
18 }
19
20 // A module for searching for libraries
21
22 #[derive(Clone)]
23 pub struct FileSearch<'a> {
24 sysroot: &'a Path,
25 triple: &'a str,
26 search_paths: &'a [SearchPath],
27 tlib_path: &'a SearchPath,
28 kind: PathKind,
29 }
30
31 impl<'a> FileSearch<'a> {
32 pub fn search_paths(&self) -> impl Iterator<Item = &'a SearchPath> {
33 let kind = self.kind;
34 self.search_paths
35 .iter()
36 .filter(move |sp| sp.kind.matches(kind))
37 .chain(std::iter::once(self.tlib_path))
38 }
39
40 pub fn get_lib_path(&self) -> PathBuf {
41 make_target_lib_path(self.sysroot, self.triple)
42 }
43
44 pub fn search<F>(&self, mut pick: F)
45 where
46 F: FnMut(&SearchPathFile, PathKind) -> FileMatch,
47 {
48 for search_path in self.search_paths() {
49 debug!("searching {}", search_path.dir.display());
50 fn is_rlib(spf: &SearchPathFile) -> bool {
51 if let Some(f) = &spf.file_name_str { f.ends_with(".rlib") } else { false }
52 }
53 // Reading metadata out of rlibs is faster, and if we find both
54 // an rlib and a dylib we only read one of the files of
55 // metadata, so in the name of speed, bring all rlib files to
56 // the front of the search list.
57 let files1 = search_path.files.iter().filter(|spf| is_rlib(&spf));
58 let files2 = search_path.files.iter().filter(|spf| !is_rlib(&spf));
59 for spf in files1.chain(files2) {
60 debug!("testing {}", spf.path.display());
61 let maybe_picked = pick(spf, search_path.kind);
62 match maybe_picked {
63 FileMatches => {
64 debug!("picked {}", spf.path.display());
65 }
66 FileDoesntMatch => {
67 debug!("rejected {}", spf.path.display());
68 }
69 }
70 }
71 }
72 }
73
74 pub fn new(
75 sysroot: &'a Path,
76 triple: &'a str,
77 search_paths: &'a Vec<SearchPath>,
78 tlib_path: &'a SearchPath,
79 kind: PathKind,
80 ) -> FileSearch<'a> {
81 debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
82 FileSearch { sysroot, triple, search_paths, tlib_path, kind }
83 }
84
85 // Returns just the directories within the search paths.
86 pub fn search_path_dirs(&self) -> Vec<PathBuf> {
87 self.search_paths().map(|sp| sp.dir.to_path_buf()).collect()
88 }
89
90 // Returns a list of directories where target-specific tool binaries are located.
91 pub fn get_tools_search_paths(&self) -> Vec<PathBuf> {
92 let mut p = PathBuf::from(self.sysroot);
93 p.push(find_libdir(self.sysroot).as_ref());
94 p.push(RUST_LIB_DIR);
95 p.push(&self.triple);
96 p.push("bin");
97 vec![p]
98 }
99 }
100
101 pub fn relative_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
102 let mut p = PathBuf::from(find_libdir(sysroot).as_ref());
103 assert!(p.is_relative());
104 p.push(RUST_LIB_DIR);
105 p.push(target_triple);
106 p.push("lib");
107 p
108 }
109
110 pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
111 sysroot.join(&relative_target_lib_path(sysroot, target_triple))
112 }
113
114 pub fn get_or_default_sysroot() -> PathBuf {
115 // Follow symlinks. If the resolved path is relative, make it absolute.
116 fn canonicalize(path: Option<PathBuf>) -> Option<PathBuf> {
117 path.and_then(|path| {
118 match fs::canonicalize(&path) {
119 // See comments on this target function, but the gist is that
120 // gcc chokes on verbatim paths which fs::canonicalize generates
121 // so we try to avoid those kinds of paths.
122 Ok(canon) => Some(fix_windows_verbatim_for_gcc(&canon)),
123 Err(e) => panic!("failed to get realpath: {}", e),
124 }
125 })
126 }
127
128 match env::current_exe() {
129 Ok(exe) => match canonicalize(Some(exe)) {
130 Some(mut p) => {
131 p.pop();
132 p.pop();
133 p
134 }
135 None => panic!("can't determine value for sysroot"),
136 },
137 Err(ref e) => panic!(format!("failed to get current_exe: {}", e)),
138 }
139 }
140
141 // The name of the directory rustc expects libraries to be located.
142 fn find_libdir(sysroot: &Path) -> Cow<'static, str> {
143 // FIXME: This is a quick hack to make the rustc binary able to locate
144 // Rust libraries in Linux environments where libraries might be installed
145 // to lib64/lib32. This would be more foolproof by basing the sysroot off
146 // of the directory where `librustc_driver` is located, rather than
147 // where the rustc binary is.
148 // If --libdir is set during configuration to the value other than
149 // "lib" (i.e., non-default), this value is used (see issue #16552).
150
151 #[cfg(target_pointer_width = "64")]
152 const PRIMARY_LIB_DIR: &str = "lib64";
153
154 #[cfg(target_pointer_width = "32")]
155 const PRIMARY_LIB_DIR: &str = "lib32";
156
157 const SECONDARY_LIB_DIR: &str = "lib";
158
159 match option_env!("CFG_LIBDIR_RELATIVE") {
160 Some(libdir) if libdir != "lib" => libdir.into(),
161 _ => {
162 if sysroot.join(PRIMARY_LIB_DIR).join(RUST_LIB_DIR).exists() {
163 PRIMARY_LIB_DIR.into()
164 } else {
165 SECONDARY_LIB_DIR.into()
166 }
167 }
168 }
169 }
170
171 // The name of rustc's own place to organize libraries.
172 // Used to be "rustc", now the default is "rustlib"
173 const RUST_LIB_DIR: &str = "rustlib";