Merge ref '942ac9ce4116' from rust-lang/rust

Pull recent changes from https://github.com/rust-lang/rust via Josh.

Upstream ref: rust-lang/rust@942ac9c
Filtered ref: rust-lang/rust-analyzer@104b3c2
Upstream diff: rust-lang/rust@485ec3f...942ac9c

This merge was created using https://github.com/rust-lang/josh-sync.

Author: The rustc-josh-sync Cronjob Bot

Cargo.lock

@@ -116,17 +116,8 @@ expect-test = "1.5.1"
 indexmap = { version = "2.9.0", features = ["serde"] }
 itertools = "0.14.0"
 libc = "0.2.172"
-libloading = "0.8.8"
-memmap2 = "0.9.5"
 nohash-hasher = "0.2.0"
 oorandom = "11.1.5"
-object = { version = "0.36.7", default-features = false, features = [
-    "std",
-    "read_core",
-    "elf",
-    "macho",
-    "pe",
-] }
 postcard = { version = "1.1.3", features = ["alloc"] }
 process-wrap = { version = "9.1.0", features = ["std"] }
 pulldown-cmark-to-cmark = "10.0.4"

Cargo.toml

@@ -13,9 +13,6 @@ rust-version.workspace = true
 doctest = false
 
 [dependencies]
-object.workspace = true
-libloading.workspace = true
-memmap2.workspace = true
 temp-dir.workspace = true
 
 paths.workspace = true
@@ -24,9 +21,6 @@ span = { path = "../span", version = "0.0.0", default-features = false}
 intern.workspace = true
 
 
-[target.'cfg(unix)'.dependencies]
-libc.workspace = true
-
 [dev-dependencies]
 expect-test.workspace = true
 line-index.workspace = true

crates/proc-macro-srv/Cargo.toml

@@ -4,22 +4,18 @@ mod proc_macros;
 
 use rustc_codegen_ssa::back::metadata::DefaultMetadataLoader;
 use rustc_interface::util::rustc_version_str;
-use rustc_metadata::locator::MetadataError;
 use rustc_proc_macro::bridge;
 use rustc_session::config::host_tuple;
 use rustc_target::spec::{Target, TargetTuple};
 use std::path::Path;
-use std::{fmt, fs, io, time::SystemTime};
+use std::{fs, io, time::SystemTime};
 use temp_dir::TempDir;
 
-use libloading::Library;
-use object::Object;
 use paths::{Utf8Path, Utf8PathBuf};
 
 use crate::{
     PanicMessage, ProcMacroClientHandle, ProcMacroKind, ProcMacroSrvSpan, TrackedEnv,
-    dylib::proc_macros::{ProcMacroClients, ProcMacros},
-    token_stream::TokenStream,
+    dylib::proc_macros::ProcMacros, token_stream::TokenStream,
 };
 
 pub(crate) struct Expander {
@@ -28,10 +24,7 @@ pub(crate) struct Expander {
 }
 
 impl Expander {
-    pub(crate) fn new(
-        temp_dir: &TempDir,
-        lib: &Utf8Path,
-    ) -> Result<Expander, LoadProcMacroDylibError> {
+    pub(crate) fn new(temp_dir: &TempDir, lib: &Utf8Path) -> io::Result<Expander> {
         // Some libraries for dynamic loading require canonicalized path even when it is
         // already absolute
         let lib = lib.canonicalize_utf8()?;
@@ -78,125 +71,28 @@ impl Expander {
     }
 }
 
-#[derive(Debug)]
-pub enum LoadProcMacroDylibError {
-    Io(io::Error),
-    LibLoading(libloading::Error),
-    MetadataError(MetadataError<'static>),
-}
-
-impl fmt::Display for LoadProcMacroDylibError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Io(e) => e.fmt(f),
-            Self::LibLoading(e) => e.fmt(f),
-            Self::MetadataError(e) => e.fmt(f),
-        }
-    }
-}
-
-impl From<io::Error> for LoadProcMacroDylibError {
-    fn from(e: io::Error) -> Self {
-        LoadProcMacroDylibError::Io(e)
-    }
-}
-
-impl From<libloading::Error> for LoadProcMacroDylibError {
-    fn from(e: libloading::Error) -> Self {
-        LoadProcMacroDylibError::LibLoading(e)
-    }
-}
-
-impl From<MetadataError<'_>> for LoadProcMacroDylibError {
-    fn from(e: MetadataError<'_>) -> Self {
-        LoadProcMacroDylibError::MetadataError(match e {
-            MetadataError::NotPresent(path) => MetadataError::NotPresent(path.into_owned().into()),
-            MetadataError::LoadFailure(err) => MetadataError::LoadFailure(err),
-            MetadataError::VersionMismatch { expected_version, found_version } => {
-                MetadataError::VersionMismatch { expected_version, found_version }
-            }
-        })
-    }
-}
-
 struct ProcMacroLibrary {
-    // this contains references to the library, so make sure this drops before _lib
     proc_macros: ProcMacros,
-    // Hold on to the library so it doesn't unload
-    _lib: Library,
 }
 
 impl ProcMacroLibrary {
-    fn open(path: &Utf8Path) -> Result<Self, LoadProcMacroDylibError> {
-        let proc_macro_kinds = rustc_span::create_default_session_globals_then(|| {
+    fn open(path: &Utf8Path) -> io::Result<Self> {
+        let proc_macros = rustc_span::create_default_session_globals_then(|| {
             let (target, _) =
                 Target::search(&TargetTuple::from_tuple(host_tuple()), Path::new(""), false)
                     .unwrap();
-            rustc_metadata::locator::get_proc_macro_info(
+            rustc_metadata::locator::get_proc_macros(
                 &target,
                 path.as_ref(),
                 &DefaultMetadataLoader,
                 rustc_version_str().unwrap_or("unknown"),
             )
         })?;
 
-        let file = fs::File::open(path)?;
-        #[allow(clippy::undocumented_unsafe_blocks)] // FIXME
-        let file = unsafe { memmap2::Mmap::map(&file) }?;
-        let obj = object::File::parse(&*file)
-            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
-        let symbol_name =
-            find_registrar_symbol(&obj).map_err(invalid_data_err)?.ok_or_else(|| {
-                invalid_data_err(format!("Cannot find registrar symbol in file {path}"))
-            })?;
-
-        // SAFETY: We have verified the validity of the dylib as a proc-macro library
-        let lib = unsafe { load_library(path) }.map_err(invalid_data_err)?;
-        // SAFETY: We have verified the validity of the dylib as a proc-macro library
-        // The 'static lifetime is a lie, it's actually the lifetime of the library but unavoidable
-        // due to self-referentiality
-        // But we make sure that we do not drop it before the symbol is dropped
-        let proc_macros =
-            unsafe { lib.get::<&'static &'static ProcMacroClients>(symbol_name.as_bytes()) };
-        match proc_macros {
-            Ok(proc_macros) => Ok(ProcMacroLibrary {
-                proc_macros: ProcMacros::new(*proc_macros, proc_macro_kinds),
-                _lib: lib,
-            }),
-            Err(e) => Err(e.into()),
-        }
+        Ok(ProcMacroLibrary { proc_macros: ProcMacros::new(proc_macros) })
     }
 }
 
-fn invalid_data_err(e: impl Into<Box<dyn std::error::Error + Send + Sync>>) -> io::Error {
-    io::Error::new(io::ErrorKind::InvalidData, e)
-}
-
-fn is_derive_registrar_symbol(symbol: &str) -> bool {
-    const NEW_REGISTRAR_SYMBOL: &str = "_rustc_proc_macro_decls_";
-    symbol.contains(NEW_REGISTRAR_SYMBOL)
-}
-
-fn find_registrar_symbol(obj: &object::File<'_>) -> object::Result<Option<String>> {
-    Ok(obj
-        .exports()?
-        .into_iter()
-        .map(|export| export.name())
-        .filter_map(|sym| String::from_utf8(sym.into()).ok())
-        .find(|sym| is_derive_registrar_symbol(sym))
-        .map(|sym| {
-            // From MacOS docs:
-            // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/dlsym.3.html
-            // Unlike other dyld API's, the symbol name passed to dlsym() must NOT be
-            // prepended with an underscore.
-            if cfg!(target_os = "macos") && sym.starts_with('_') {
-                sym[1..].to_owned()
-            } else {
-                sym
-            }
-        }))
-}
-
 /// Copy the dylib to temp directory to prevent locking in Windows
 #[cfg(windows)]
 fn ensure_file_with_lock_free_access(
@@ -233,54 +129,3 @@ fn ensure_file_with_lock_free_access(
 ) -> io::Result<Utf8PathBuf> {
     Ok(path.to_owned())
 }
-
-/// Loads dynamic library in platform dependent manner.
-///
-/// For unix, you have to use RTLD_DEEPBIND flag to escape problems described
-/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample)
-/// and [here](https://github.com/rust-lang/rust/issues/60593).
-///
-/// Usage of RTLD_DEEPBIND
-/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample/issues/1)
-///
-/// It seems that on Windows that behaviour is default, so we do nothing in that case.
-///
-/// # Safety
-///
-/// The caller is responsible for ensuring that the path is valid proc-macro library
-#[cfg(windows)]
-unsafe fn load_library(file: &Utf8Path) -> Result<Library, libloading::Error> {
-    // SAFETY: The caller is responsible for ensuring that the path is valid proc-macro library
-    unsafe { Library::new(file) }
-}
-
-/// Loads dynamic library in platform dependent manner.
-///
-/// For unix, you have to use RTLD_DEEPBIND flag to escape problems described
-/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample)
-/// and [here](https://github.com/rust-lang/rust/issues/60593).
-///
-/// Usage of RTLD_DEEPBIND
-/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample/issues/1)
-///
-/// It seems that on Windows that behaviour is default, so we do nothing in that case.
-///
-/// # Safety
-///
-/// The caller is responsible for ensuring that the path is valid proc-macro library
-#[cfg(unix)]
-unsafe fn load_library(file: &Utf8Path) -> Result<Library, libloading::Error> {
-    // not defined by POSIX, different values on mips vs other targets
-    #[cfg(target_env = "gnu")]
-    use libc::RTLD_DEEPBIND;
-    use libloading::os::unix::Library as UnixLibrary;
-    // defined by POSIX
-    use libloading::os::unix::RTLD_NOW;
-
-    // MUSL and bionic don't have it..
-    #[cfg(not(target_env = "gnu"))]
-    const RTLD_DEEPBIND: std::os::raw::c_int = 0x0;
-
-    // SAFETY: The caller is responsible for ensuring that the path is valid proc-macro library
-    unsafe { UnixLibrary::open(Some(file), RTLD_NOW | RTLD_DEEPBIND).map(|lib| lib.into()) }
-}

crates/proc-macro-srv/src/dylib.rs

@@ -4,9 +4,6 @@ use crate::{
 };
 use rustc_proc_macro::bridge;
 
-#[repr(transparent)]
-pub(crate) struct ProcMacroClients([bridge::client::Client]);
-
 impl From<bridge::PanicMessage> for crate::PanicMessage {
     fn from(p: bridge::PanicMessage) -> Self {
         Self { message: p.into_string() }
@@ -17,10 +14,9 @@ pub(crate) struct ProcMacros(Vec<(bridge::client::Client, rustc_metadata::ProcMa
 
 impl ProcMacros {
     pub(super) fn new(
-        clients: &ProcMacroClients,
-        kinds: Vec<rustc_metadata::ProcMacroKind>,
+        macros: Vec<(bridge::client::Client, rustc_metadata::ProcMacroKind)>,
     ) -> Self {
-        ProcMacros(clients.0.iter().copied().zip(kinds).collect::<Vec<_>>())
+        ProcMacros(macros)
     }
 
     pub(crate) fn expand<'a, S: ProcMacroSrvSpan>(

crates/proc-macro-srv/src/dylib/proc_macros.rs

@@ -10,9 +10,10 @@
 
 #![cfg(feature = "in-rust-tree")]
 #![feature(proc_macro_internals, proc_macro_diagnostic, proc_macro_span, rustc_private)]
-#![expect(unreachable_pub, internal_features, clippy::disallowed_types, clippy::print_stderr)]
+#![expect(internal_features, clippy::disallowed_types, clippy::print_stderr)]
 #![allow(unused_features, unused_crate_dependencies)]
 #![deny(deprecated_safe, clippy::undocumented_unsafe_blocks)]
+#![cfg_attr(test, expect(unreachable_pub))]
 
 extern crate rustc_codegen_ssa;
 extern crate rustc_driver as _;