refactor: replace &PathBuf with &Path to enhance generality

compiler/rustc_driver_impl/src/lib.rs

@@ -26,7 +26,7 @@ use std::fmt::Write as _;
 use std::fs::{self, File};
 use std::io::{self, IsTerminal, Read, Write};
 use std::panic::{self, PanicHookInfo, catch_unwind};
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::process::{self, Command, Stdio};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, OnceLock};
@@ -460,7 +460,7 @@ fn run_compiler(
     })
 }
 
-fn dump_feature_usage_metrics(tcxt: TyCtxt<'_>, metrics_dir: &PathBuf) {
+fn dump_feature_usage_metrics(tcxt: TyCtxt<'_>, metrics_dir: &Path) {
     let output_filenames = tcxt.output_filenames(());
     let mut metrics_file_name = std::ffi::OsString::from("unstable_feature_usage_metrics-");
     let mut metrics_path = output_filenames.with_directory_and_extension(metrics_dir, "json");

compiler/rustc_session/src/config.rs

@@ -1076,7 +1076,7 @@ impl OutputFilenames {
         self.with_directory_and_extension(&self.out_directory, extension)
     }
 
-    pub fn with_directory_and_extension(&self, directory: &PathBuf, extension: &str) -> PathBuf {
+    pub fn with_directory_and_extension(&self, directory: &Path, extension: &str) -> PathBuf {
         let mut path = directory.join(&self.filestem);
         path.set_extension(extension);
         path

src/bootstrap/src/core/build_steps/setup.rs

@@ -209,7 +209,7 @@ pub fn setup(config: &Config, profile: Profile) {
     setup_config_toml(path, profile, config);
 }
 
-fn setup_config_toml(path: &PathBuf, profile: Profile, config: &Config) {
+fn setup_config_toml(path: &Path, profile: Profile, config: &Config) {
     if profile == Profile::None {
         return;
     }

src/bootstrap/src/core/config/config.rs

@@ -1942,7 +1942,7 @@ impl Config {
                 );
 
                 let channel = config
-                    .read_file_by_commit(&PathBuf::from("src/ci/channel"), commit)
+                    .read_file_by_commit(Path::new("src/ci/channel"), commit)
                     .trim()
                     .to_owned();
 
@@ -2383,12 +2383,10 @@ impl Config {
     /// Return the version it would have used for the given commit.
     pub(crate) fn artifact_version_part(&self, commit: &str) -> String {
         let (channel, version) = if self.rust_info.is_managed_git_subrepository() {
-            let channel = self
-                .read_file_by_commit(&PathBuf::from("src/ci/channel"), commit)
-                .trim()
-                .to_owned();
+            let channel =
+                self.read_file_by_commit(Path::new("src/ci/channel"), commit).trim().to_owned();
             let version =
-                self.read_file_by_commit(&PathBuf::from("src/version"), commit).trim().to_owned();
+                self.read_file_by_commit(Path::new("src/version"), commit).trim().to_owned();
             (channel, version)
         } else {
             let channel = fs::read_to_string(self.src.join("src/ci/channel"));

src/tools/compiletest/src/debuggers.rs

@@ -1,6 +1,6 @@
 use std::env;
 use std::ffi::OsString;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::process::Command;
 use std::sync::Arc;
 
@@ -141,7 +141,7 @@ pub(crate) fn extract_cdb_version(full_version_line: &str) -> Option<[u16; 4]> {
 pub(crate) fn analyze_gdb(
     gdb: Option<String>,
     target: &str,
-    android_cross_path: &PathBuf,
+    android_cross_path: &Path,
 ) -> (Option<String>, Option<u32>) {
     #[cfg(not(windows))]
     const GDB_FALLBACK: &str = "gdb";

src/tools/compiletest/src/lib.rs

@@ -598,10 +598,9 @@ pub fn collect_and_make_tests(config: Arc<Config>) -> Vec<test::TestDescAndFn> {
     let mut collector =
         TestCollector { tests: vec![], found_path_stems: HashSet::new(), poisoned: false };
 
-    collect_tests_from_dir(&cx, &mut collector, &cx.config.src_base, &PathBuf::new())
-        .unwrap_or_else(|reason| {
-            panic!("Could not read tests from {}: {reason}", cx.config.src_base.display())
-        });
+    collect_tests_from_dir(&cx, &mut collector, &cx.config.src_base, Path::new("")).unwrap_or_else(
+        |reason| panic!("Could not read tests from {}: {reason}", cx.config.src_base.display()),
+    );
 
     let TestCollector { tests, found_path_stems, poisoned } = collector;
 

src/tools/compiletest/src/runtest.rs

@@ -2560,7 +2560,7 @@ impl<'test> TestCx<'test> {
         })
     }
 
-    fn delete_file(&self, file: &PathBuf) {
+    fn delete_file(&self, file: &Path) {
         if !file.exists() {
             // Deleting a nonexistent file would error.
             return;

src/tools/rustc-perf-wrapper/src/main.rs

@@ -163,7 +163,7 @@ fn apply_shared_opts(cmd: &mut Command, opts: &SharedOpts) {
     }
 }
 
-fn execute_benchmark(cmd: &mut Command, compiler: &PathBuf) {
+fn execute_benchmark(cmd: &mut Command, compiler: &Path) {
     cmd.arg(compiler);
     println!("Running `rustc-perf` using `{}`", compiler.display());
 

src/tools/rustfmt/src/test/mod.rs

@@ -663,7 +663,7 @@ fn check_files(files: Vec<PathBuf>, opt_config: &Option<PathBuf>) -> (Vec<Format
 
         debug!("Testing '{}'...", file_name.display());
 
-        match idempotent_check(&file_name, opt_config) {
+        match idempotent_check(&file_name, opt_config.as_deref()) {
             Ok(ref report) if report.has_warnings() => {
                 print!("{}", FormatReportFormatterBuilder::new(report).build());
                 fails += 1;
@@ -775,8 +775,8 @@ fn get_editions_from_comments(
 }
 
 fn idempotent_check(
-    filename: &PathBuf,
-    opt_config: &Option<PathBuf>,
+    filename: &Path,
+    opt_config: Option<&Path>,
 ) -> Result<FormatReport, IdempotentCheckError> {
     let sig_comments = read_significant_comments(filename);
     let config = if let Some(ref config_file_path) = opt_config {