Rollup merge of rust-lang#126099 - Nilstrieb:crate-loader-cleanups, r=jieyouxu

Crate loader cleanups

Minor cleanups I found while trying to understand how all of this works

Author: workingjubilee

compiler/rustc_metadata/src/creader.rs

@@ -581,7 +581,6 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
                 self.tcx.crate_types().iter().all(|c| *c == CrateType::Rlib),
                 hash,
                 extra_filename,
-                false, // is_host
                 path_kind,
             );
 

compiler/rustc_metadata/src/locator.rs

@@ -222,7 +222,6 @@ use rustc_data_structures::owned_slice::slice_owned;
 use rustc_data_structures::svh::Svh;
 use rustc_errors::{DiagArgValue, IntoDiagArg};
 use rustc_fs_util::try_canonicalize;
-use rustc_session::config;
 use rustc_session::cstore::CrateSource;
 use rustc_session::filesearch::FileSearch;
 use rustc_session::search_paths::PathKind;
@@ -309,7 +308,6 @@ impl<'a> CrateLocator<'a> {
         is_rlib: bool,
         hash: Option<Svh>,
         extra_filename: Option<&'a str>,
-        is_host: bool,
         path_kind: PathKind,
     ) -> CrateLocator<'a> {
         let needs_object_code = sess.opts.output_types.should_codegen();
@@ -340,17 +338,9 @@ impl<'a> CrateLocator<'a> {
             },
             hash,
             extra_filename,
-            target: if is_host { &sess.host } else { &sess.target },
-            triple: if is_host {
-                TargetTriple::from_triple(config::host_triple())
-            } else {
-                sess.opts.target_triple.clone()
-            },
-            filesearch: if is_host {
-                sess.host_filesearch(path_kind)
-            } else {
-                sess.target_filesearch(path_kind)
-            },
+            target: &sess.target,
+            triple: sess.opts.target_triple.clone(),
+            filesearch: sess.target_filesearch(path_kind),
             is_proc_macro: false,
             crate_rejections: CrateRejections::default(),
         }
@@ -424,12 +414,18 @@ impl<'a> CrateLocator<'a> {
                 debug!("testing {}", spf.path.display());
 
                 let f = &spf.file_name_str;
-                let (hash, kind) = if f.starts_with(rlib_prefix) && f.ends_with(rlib_suffix) {
-                    (&f[rlib_prefix.len()..(f.len() - rlib_suffix.len())], CrateFlavor::Rlib)
-                } else if f.starts_with(rmeta_prefix) && f.ends_with(rmeta_suffix) {
-                    (&f[rmeta_prefix.len()..(f.len() - rmeta_suffix.len())], CrateFlavor::Rmeta)
-                } else if f.starts_with(dylib_prefix) && f.ends_with(dylib_suffix.as_ref()) {
-                    (&f[dylib_prefix.len()..(f.len() - dylib_suffix.len())], CrateFlavor::Dylib)
+                let (hash, kind) = if let Some(f) = f.strip_prefix(rlib_prefix)
+                    && let Some(f) = f.strip_suffix(rlib_suffix)
+                {
+                    (f, CrateFlavor::Rlib)
+                } else if let Some(f) = f.strip_prefix(rmeta_prefix)
+                    && let Some(f) = f.strip_suffix(rmeta_suffix)
+                {
+                    (f, CrateFlavor::Rmeta)
+                } else if let Some(f) = f.strip_prefix(dylib_prefix)
+                    && let Some(f) = f.strip_suffix(dylib_suffix.as_ref())
+                {
+                    (f, CrateFlavor::Dylib)
                 } else {
                     if f.starts_with(staticlib_prefix) && f.ends_with(staticlib_suffix.as_ref()) {
                         self.crate_rejections.via_kind.push(CrateMismatch {

compiler/rustc_session/src/filesearch.rs

@@ -12,15 +12,15 @@ use tracing::debug;
 pub struct FileSearch<'a> {
     sysroot: &'a Path,
     triple: &'a str,
-    search_paths: &'a [SearchPath],
+    cli_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
+        self.cli_search_paths
             .iter()
             .filter(move |sp| sp.kind.matches(kind))
             .chain(std::iter::once(self.tlib_path))
@@ -37,26 +37,26 @@ impl<'a> FileSearch<'a> {
     pub fn new(
         sysroot: &'a Path,
         triple: &'a str,
-        search_paths: &'a [SearchPath],
+        cli_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 }
+        FileSearch { sysroot, triple, cli_search_paths, tlib_path, kind }
     }
 }
 
 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")])
+    let rustlib_path = rustc_target::relative_target_rustlib_path(sysroot, target_triple);
+    sysroot.join(rustlib_path).join("lib")
 }
 
 /// Returns a path to the target's `bin` folder within its `rustlib` path in the sysroot. This is
 /// where binaries are usually installed, e.g. the self-contained linkers, lld-wrappers, LLVM tools,
 /// etc.
 pub fn make_target_bin_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("bin")])
+    let rustlib_path = rustc_target::relative_target_rustlib_path(sysroot, target_triple);
+    sysroot.join(rustlib_path).join("bin")
 }
 
 #[cfg(unix)]
@@ -275,7 +275,7 @@ pub fn get_or_default_sysroot() -> Result<PathBuf, String> {
                 p.pop();
                 p.pop();
                 // Look for the target rustlib directory in the suspected sysroot.
-                let mut rustlib_path = rustc_target::target_rustlib_path(&p, "dummy");
+                let mut rustlib_path = rustc_target::relative_target_rustlib_path(&p, "dummy");
                 rustlib_path.pop(); // pop off the dummy target.
                 rustlib_path.exists().then_some(p)
             }

compiler/rustc_target/src/lib.rs

@@ -41,17 +41,13 @@ const RUST_LIB_DIR: &str = "rustlib";
 ///
 /// For example: `target_sysroot_path("/usr", "x86_64-unknown-linux-gnu")` =>
 /// `"lib*/rustlib/x86_64-unknown-linux-gnu"`.
-pub fn target_rustlib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
-    let libdir = find_libdir(sysroot);
-    PathBuf::from_iter([
-        Path::new(libdir.as_ref()),
-        Path::new(RUST_LIB_DIR),
-        Path::new(target_triple),
-    ])
+pub fn relative_target_rustlib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
+    let libdir = find_relative_libdir(sysroot);
+    Path::new(libdir.as_ref()).join(RUST_LIB_DIR).join(target_triple)
 }
 
 /// The name of the directory rustc expects libraries to be located.
-fn find_libdir(sysroot: &Path) -> std::borrow::Cow<'static, str> {
+fn find_relative_libdir(sysroot: &Path) -> std::borrow::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

compiler/rustc_target/src/spec/mod.rs

@@ -3367,7 +3367,7 @@ impl Target {
 
                 // Additionally look in the sysroot under `lib/rustlib/<triple>/target.json`
                 // as a fallback.
-                let rustlib_path = crate::target_rustlib_path(sysroot, target_triple);
+                let rustlib_path = crate::relative_target_rustlib_path(sysroot, target_triple);
                 let p = PathBuf::from_iter([
                     Path::new(sysroot),
                     Path::new(&rustlib_path),