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use smallvec::{smallvec, SmallVec};
use std::env;
use std::fs;
use std::path::{Path, PathBuf};
use crate::search_paths::{PathKind, SearchPath};
use rustc_fs_util::fix_windows_verbatim_for_gcc;
#[derive(Copy, Clone)]
pub enum FileMatch {
FileMatches,
FileDoesntMatch,
}
#[derive(Clone)]
pub struct FileSearch<'a> {
sysroot: &'a Path,
triple: &'a str,
search_paths: &'a [SearchPath],
tlib_path: &'a SearchPath,
kind: PathKind,
}
impl<'a> FileSearch<'a> {
pub fn search_paths(&self) -> impl Iterator<Item = &'a SearchPath> {
let kind = self.kind;
self.search_paths
.iter()
.filter(move |sp| sp.kind.matches(kind))
.chain(std::iter::once(self.tlib_path))
}
pub fn get_lib_path(&self) -> PathBuf {
make_target_lib_path(self.sysroot, self.triple)
}
pub fn get_self_contained_lib_path(&self) -> PathBuf {
self.get_lib_path().join("self-contained")
}
pub fn new(
sysroot: &'a Path,
triple: &'a str,
search_paths: &'a [SearchPath],
tlib_path: &'a SearchPath,
kind: PathKind,
) -> FileSearch<'a> {
debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
FileSearch { sysroot, triple, search_paths, tlib_path, kind }
}
pub fn search_path_dirs(&self) -> Vec<PathBuf> {
self.search_paths().map(|sp| sp.dir.to_path_buf()).collect()
}
}
pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
let rustlib_path = rustc_target::target_rustlib_path(sysroot, target_triple);
PathBuf::from_iter([sysroot, Path::new(&rustlib_path), Path::new("lib")])
}
#[cfg(unix)]
fn current_dll_path() -> Result<PathBuf, String> {
use std::ffi::{CStr, OsStr};
use std::os::unix::prelude::*;
unsafe {
let addr = current_dll_path as usize as *mut _;
let mut info = std::mem::zeroed();
if libc::dladdr(addr, &mut info) == 0 {
return Err("dladdr failed".into());
}
if info.dli_fname.is_null() {
return Err("dladdr returned null pointer".into());
}
let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
let os = OsStr::from_bytes(bytes);
Ok(PathBuf::from(os))
}
}
#[cfg(windows)]
fn current_dll_path() -> Result<PathBuf, String> {
use std::ffi::OsString;
use std::io;
use std::os::windows::prelude::*;
use std::ptr;
use winapi::um::libloaderapi::{
GetModuleFileNameW, GetModuleHandleExW, GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
};
unsafe {
let mut module = ptr::null_mut();
let r = GetModuleHandleExW(
GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
current_dll_path as usize as *mut _,
&mut module,
);
if r == 0 {
return Err(format!("GetModuleHandleExW failed: {}", io::Error::last_os_error()));
}
let mut space = Vec::with_capacity(1024);
let r = GetModuleFileNameW(module, space.as_mut_ptr(), space.capacity() as u32);
if r == 0 {
return Err(format!("GetModuleFileNameW failed: {}", io::Error::last_os_error()));
}
let r = r as usize;
if r >= space.capacity() {
return Err(format!("our buffer was too small? {}", io::Error::last_os_error()));
}
space.set_len(r);
let os = OsString::from_wide(&space);
Ok(PathBuf::from(os))
}
}
pub fn sysroot_candidates() -> SmallVec<[PathBuf; 2]> {
let target = crate::config::host_triple();
let mut sysroot_candidates: SmallVec<[PathBuf; 2]> =
smallvec![get_or_default_sysroot().expect("Failed finding sysroot")];
let path = current_dll_path().and_then(|s| Ok(s.canonicalize().map_err(|e| e.to_string())?));
if let Ok(dll) = path {
if let Some(path) = dll.parent().and_then(|p| p.parent()) {
sysroot_candidates.push(path.to_owned());
if path.ends_with(target) {
sysroot_candidates.extend(
path.parent() .and_then(|p| p.parent()) .and_then(|p| p.parent()) .map(|s| s.to_owned()),
);
}
}
}
return sysroot_candidates;
}
pub fn get_or_default_sysroot() -> Result<PathBuf, String> {
fn canonicalize(path: PathBuf) -> PathBuf {
let path = fs::canonicalize(&path).unwrap_or(path);
fix_windows_verbatim_for_gcc(&path)
}
fn default_from_rustc_driver_dll() -> Result<PathBuf, String> {
let dll = current_dll_path().and_then(|s| Ok(canonicalize(s)))?;
let dir = dll.parent().and_then(|p| p.parent()).ok_or(format!(
"Could not move 2 levels upper using `parent()` on {}",
dll.display()
))?;
if dir.ends_with(crate::config::host_triple()) {
dir.parent() .and_then(|p| p.parent()) .and_then(|p| p.parent()) .map(|s| s.to_owned())
.ok_or(format!(
"Could not move 3 levels upper using `parent()` on {}",
dir.display()
))
} else {
Ok(dir.to_owned())
}
}
fn from_env_args_next() -> Option<PathBuf> {
match env::args_os().next() {
Some(first_arg) => {
let mut p = PathBuf::from(first_arg);
if fs::read_link(&p).is_err() {
return None;
}
p.pop();
p.pop();
let mut rustlib_path = rustc_target::target_rustlib_path(&p, "dummy");
rustlib_path.pop(); if rustlib_path.exists() { Some(p) } else { None }
}
None => None,
}
}
Ok(from_env_args_next().unwrap_or(default_from_rustc_driver_dll()?))
}