229 lines
8.3 KiB
Rust
229 lines
8.3 KiB
Rust
//! A module for searching for libraries
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use smallvec::{smallvec, SmallVec};
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use std::env;
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use std::fs;
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use std::iter::FromIterator;
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use std::path::{Path, PathBuf};
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use crate::search_paths::{PathKind, SearchPath};
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use rustc_fs_util::fix_windows_verbatim_for_gcc;
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#[derive(Copy, Clone)]
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pub enum FileMatch {
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FileMatches,
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FileDoesntMatch,
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}
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#[derive(Clone)]
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pub struct FileSearch<'a> {
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sysroot: &'a Path,
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triple: &'a str,
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search_paths: &'a [SearchPath],
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tlib_path: &'a SearchPath,
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kind: PathKind,
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}
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impl<'a> FileSearch<'a> {
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pub fn search_paths(&self) -> impl Iterator<Item = &'a SearchPath> {
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let kind = self.kind;
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self.search_paths
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.iter()
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.filter(move |sp| sp.kind.matches(kind))
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.chain(std::iter::once(self.tlib_path))
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}
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pub fn get_lib_path(&self) -> PathBuf {
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make_target_lib_path(self.sysroot, self.triple)
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}
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pub fn get_self_contained_lib_path(&self) -> PathBuf {
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self.get_lib_path().join("self-contained")
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}
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pub fn new(
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sysroot: &'a Path,
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triple: &'a str,
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search_paths: &'a [SearchPath],
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tlib_path: &'a SearchPath,
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kind: PathKind,
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) -> FileSearch<'a> {
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debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
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FileSearch { sysroot, triple, search_paths, tlib_path, kind }
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}
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/// Returns just the directories within the search paths.
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pub fn search_path_dirs(&self) -> Vec<PathBuf> {
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self.search_paths().map(|sp| sp.dir.to_path_buf()).collect()
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}
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}
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pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
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let rustlib_path = rustc_target::target_rustlib_path(sysroot, target_triple);
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PathBuf::from_iter([sysroot, Path::new(&rustlib_path), Path::new("lib")])
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}
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#[cfg(unix)]
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fn current_dll_path() -> Result<PathBuf, String> {
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use std::ffi::{CStr, OsStr};
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use std::os::unix::prelude::*;
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unsafe {
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let addr = current_dll_path as usize as *mut _;
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let mut info = std::mem::zeroed();
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if libc::dladdr(addr, &mut info) == 0 {
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return Err("dladdr failed".into());
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}
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if info.dli_fname.is_null() {
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return Err("dladdr returned null pointer".into());
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}
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let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
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let os = OsStr::from_bytes(bytes);
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Ok(PathBuf::from(os))
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}
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}
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#[cfg(windows)]
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fn current_dll_path() -> Result<PathBuf, String> {
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use std::ffi::OsString;
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use std::io;
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use std::os::windows::prelude::*;
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use std::ptr;
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use winapi::um::libloaderapi::{
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GetModuleFileNameW, GetModuleHandleExW, GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
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};
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unsafe {
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let mut module = ptr::null_mut();
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let r = GetModuleHandleExW(
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GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
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current_dll_path as usize as *mut _,
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&mut module,
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);
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if r == 0 {
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return Err(format!("GetModuleHandleExW failed: {}", io::Error::last_os_error()));
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}
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let mut space = Vec::with_capacity(1024);
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let r = GetModuleFileNameW(module, space.as_mut_ptr(), space.capacity() as u32);
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if r == 0 {
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return Err(format!("GetModuleFileNameW failed: {}", io::Error::last_os_error()));
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}
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let r = r as usize;
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if r >= space.capacity() {
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return Err(format!("our buffer was too small? {}", io::Error::last_os_error()));
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}
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space.set_len(r);
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let os = OsString::from_wide(&space);
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Ok(PathBuf::from(os))
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}
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}
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pub fn sysroot_candidates() -> SmallVec<[PathBuf; 2]> {
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let target = crate::config::host_triple();
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let mut sysroot_candidates: SmallVec<[PathBuf; 2]> =
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smallvec![get_or_default_sysroot().expect("Failed finding sysroot")];
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let path = current_dll_path().and_then(|s| Ok(s.canonicalize().map_err(|e| e.to_string())?));
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if let Ok(dll) = path {
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// use `parent` twice to chop off the file name and then also the
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// directory containing the dll which should be either `lib` or `bin`.
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if let Some(path) = dll.parent().and_then(|p| p.parent()) {
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// The original `path` pointed at the `rustc_driver` crate's dll.
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// Now that dll should only be in one of two locations. The first is
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// in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
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// other is the target's libdir, for example
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// `$sysroot/lib/rustlib/$target/lib/*.dll`.
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//
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// We don't know which, so let's assume that if our `path` above
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// ends in `$target` we *could* be in the target libdir, and always
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// assume that we may be in the main libdir.
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sysroot_candidates.push(path.to_owned());
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if path.ends_with(target) {
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sysroot_candidates.extend(
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path.parent() // chop off `$target`
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.and_then(|p| p.parent()) // chop off `rustlib`
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.and_then(|p| p.parent()) // chop off `lib`
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.map(|s| s.to_owned()),
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);
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}
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}
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}
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return sysroot_candidates;
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}
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/// This function checks if sysroot is found using env::args().next(), and if it
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/// is not found, finds sysroot from current rustc_driver dll.
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pub fn get_or_default_sysroot() -> Result<PathBuf, String> {
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// Follow symlinks. If the resolved path is relative, make it absolute.
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fn canonicalize(path: PathBuf) -> PathBuf {
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let path = fs::canonicalize(&path).unwrap_or(path);
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// See comments on this target function, but the gist is that
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// gcc chokes on verbatim paths which fs::canonicalize generates
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// so we try to avoid those kinds of paths.
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fix_windows_verbatim_for_gcc(&path)
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}
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fn default_from_rustc_driver_dll() -> Result<PathBuf, String> {
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let dll = current_dll_path().and_then(|s| Ok(canonicalize(s)))?;
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// `dll` will be in one of the following two:
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// - compiler's libdir: $sysroot/lib/*.dll
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// - target's libdir: $sysroot/lib/rustlib/$target/lib/*.dll
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//
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// use `parent` twice to chop off the file name and then also the
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// directory containing the dll
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let dir = dll.parent().and_then(|p| p.parent()).ok_or(format!(
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"Could not move 2 levels upper using `parent()` on {}",
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dll.display()
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))?;
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// if `dir` points target's dir, move up to the sysroot
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if dir.ends_with(crate::config::host_triple()) {
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dir.parent() // chop off `$target`
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.and_then(|p| p.parent()) // chop off `rustlib`
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.and_then(|p| p.parent()) // chop off `lib`
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.map(|s| s.to_owned())
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.ok_or(format!(
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"Could not move 3 levels upper using `parent()` on {}",
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dir.display()
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))
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} else {
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Ok(dir.to_owned())
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}
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}
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// Use env::args().next() to get the path of the executable without
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// following symlinks/canonicalizing any component. This makes the rustc
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// binary able to locate Rust libraries in systems using content-addressable
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// storage (CAS).
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fn from_env_args_next() -> Option<PathBuf> {
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match env::args_os().next() {
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Some(first_arg) => {
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let mut p = PathBuf::from(first_arg);
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// Check if sysroot is found using env::args().next() only if the rustc in argv[0]
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// is a symlink (see #79253). We might want to change/remove it to conform with
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// https://www.gnu.org/prep/standards/standards.html#Finding-Program-Files in the
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// future.
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if fs::read_link(&p).is_err() {
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// Path is not a symbolic link or does not exist.
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return None;
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}
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// Pop off `bin/rustc`, obtaining the suspected sysroot.
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p.pop();
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p.pop();
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// Look for the target rustlib directory in the suspected sysroot.
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let mut rustlib_path = rustc_target::target_rustlib_path(&p, "dummy");
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rustlib_path.pop(); // pop off the dummy target.
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if rustlib_path.exists() { Some(p) } else { None }
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}
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None => None,
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}
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}
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Ok(from_env_args_next().unwrap_or(default_from_rustc_driver_dll()?))
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}
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