Couple of small changes

Also avoids two unnecessary allocations in handle_split_dwarf.

src/symbolize/gimli/elf.rs

@@ -261,7 +261,7 @@ impl<'a> Object<'a> {
         let section = self.section_header(".gnu_debuglink")?;
         let data = section.data(self.endian, self.data).ok()?;
         let len = data.iter().position(|x| *x == 0)?;
-        let filename = &data[..len];
+        let filename = OsStr::from_bytes(&data[..len]);
         let offset = (len + 1 + 3) & !3;
         let crc_bytes = data
             .get(offset..offset + 4)
@@ -276,7 +276,7 @@ impl<'a> Object<'a> {
         let section = self.section_header(".gnu_debugaltlink")?;
         let data = section.data(self.endian, self.data).ok()?;
         let len = data.iter().position(|x| *x == 0)?;
-        let filename = &data[..len];
+        let filename = OsStr::from_bytes(&data[..len]);
         let build_id = &data[len + 1..];
         let path_sup = locate_debugaltlink(path, filename, build_id)?;
         Some((path_sup, build_id))
@@ -304,7 +304,7 @@ fn decompress_zlib(input: &[u8], output: &mut [u8]) -> Option<()> {
     }
 }
 
-const DEBUG_PATH: &[u8] = b"/usr/lib/debug";
+const DEBUG_PATH: &str = "/usr/lib/debug";
 
 fn debug_path_exists() -> bool {
     cfg_if::cfg_if! {
@@ -314,7 +314,7 @@ fn debug_path_exists() -> bool {
 
             let mut exists = DEBUG_PATH_EXISTS.load(Ordering::Relaxed);
             if exists == 0 {
-                exists = if Path::new(OsStr::from_bytes(DEBUG_PATH)).is_dir() {
+                exists = if Path::new(OsStr::new(DEBUG_PATH)).is_dir() {
                     1
                 } else {
                     2
@@ -377,13 +377,12 @@ fn hex(byte: u8) -> u8 {
 /// gdb also allows the user to customize the debug search path, but we don't.
 ///
 /// gdb also supports debuginfod, but we don't yet.
-fn locate_debuglink(path: &Path, filename: &[u8]) -> Option<PathBuf> {
+fn locate_debuglink(path: &Path, filename: &OsStr) -> Option<PathBuf> {
     let path = fs::canonicalize(path).ok()?;
     let parent = path.parent()?;
     let mut f = PathBuf::from(OsString::with_capacity(
         DEBUG_PATH.len() + parent.as_os_str().len() + filename.len() + 2,
     ));
-    let filename = Path::new(OsStr::from_bytes(filename));
 
     // Try "/parent/filename" if it differs from "path"
     f.push(parent);
@@ -408,7 +407,7 @@ fn locate_debuglink(path: &Path, filename: &[u8]) -> Option<PathBuf> {
         let mut s = OsString::from(f);
         s.clear();
         f = PathBuf::from(s);
-        f.push(OsStr::from_bytes(DEBUG_PATH));
+        f.push(OsStr::new(DEBUG_PATH));
         f.push(parent.strip_prefix("/").unwrap());
         f.push(filename);
         if f.is_file() {
@@ -431,8 +430,8 @@ fn locate_debuglink(path: &Path, filename: &[u8]) -> Option<PathBuf> {
 /// gdb also allows the user to customize the debug search path, but we don't.
 ///
 /// gdb also supports debuginfod, but we don't yet.
-fn locate_debugaltlink(path: &Path, filename: &[u8], build_id: &[u8]) -> Option<PathBuf> {
-    let filename = Path::new(OsStr::from_bytes(filename));
+fn locate_debugaltlink(path: &Path, filename: &OsStr, build_id: &[u8]) -> Option<PathBuf> {
+    let filename = Path::new(filename);
     if filename.is_absolute() {
         if filename.is_file() {
             return Some(filename.into());
@@ -450,11 +449,6 @@ fn locate_debugaltlink(path: &Path, filename: &[u8], build_id: &[u8]) -> Option<
     locate_build_id(build_id)
 }
 
-fn convert_path<R: gimli::Reader>(r: &R) -> Result<PathBuf, gimli::Error> {
-    let bytes = r.to_slice()?;
-    Ok(PathBuf::from(OsStr::from_bytes(&bytes)))
-}
-
 pub(super) fn handle_split_dwarf<'data>(
     package: Option<&gimli::DwarfPackage<EndianSlice<'data, Endian>>>,
     stash: &'data Stash,
@@ -468,10 +462,10 @@ pub(super) fn handle_split_dwarf<'data>(
 
     let mut path = PathBuf::new();
     if let Some(p) = load.comp_dir.as_ref() {
-        path.push(convert_path(p).ok()?);
+        path.push(OsStr::from_bytes(&p.slice()));
     }
 
-    path.push(convert_path(load.path.as_ref()?).ok()?);
+    path.push(OsStr::from_bytes(&load.path.as_ref()?));
 
     if let Some(map_dwo) = super::mmap(&path) {
         let map_dwo = stash.cache_mmap(map_dwo);

src/symbolize/gimli/xcoff.rs

@@ -1,4 +1,4 @@
-use super::mystd::ffi::{OsStr, OsString};
+use super::mystd::ffi::OsStr;
 use super::mystd::os::unix::ffi::OsStrExt;
 use super::{gimli, Context, Endian, EndianSlice, Mapping, Path, Stash, Vec};
 use alloc::sync::Arc;
@@ -17,7 +17,7 @@ type Xcoff = object::xcoff::FileHeader32;
 type Xcoff = object::xcoff::FileHeader64;
 
 impl Mapping {
-    pub fn new(path: &Path, member_name: &OsString) -> Option<Mapping> {
+    pub fn new(path: &Path, member_name: &OsStr) -> Option<Mapping> {
         let map = super::mmap(path)?;
         Mapping::mk(map, |data, stash| {
             if member_name.is_empty() {
@@ -79,7 +79,7 @@ pub fn parse_xcoff(data: &[u8]) -> Option<Image> {
     }
 }
 
-pub fn parse_image(path: &Path, member_name: &OsString) -> Option<Image> {
+pub fn parse_image(path: &Path, member_name: &OsStr) -> Option<Image> {
     let map = super::mmap(path)?;
     let data = map.deref();
     if member_name.is_empty() {