Auto merge of #14658 - Veykril:proc-macro-ra-srv, r=Veykril

Remove proc-macro server command from the rust-analyzer binary

We dropped support for concrete proc-macro abi versions so this no longer serves any purposes.

15 files changed, 109 insertions, 162 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 8759782bb29..e0d5878d7fa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1464,7 +1464,6 @@ dependencies = [
  "parking_lot 0.12.1",
  "parking_lot_core 0.9.6",
  "proc-macro-api",
- "proc-macro-srv-cli",
  "profile",
  "project-model",
  "rayon",
diff --git a/crates/proc-macro-api/src/lib.rs b/crates/proc-macro-api/src/lib.rs
index 14a7b913bf0..ab15f414bbf 100644
--- a/crates/proc-macro-api/src/lib.rs
+++ b/crates/proc-macro-api/src/lib.rs
@@ -13,7 +13,6 @@ mod version;
 
 use paths::AbsPathBuf;
 use std::{
-    ffi::OsStr,
     fmt, io,
     sync::{Arc, Mutex},
 };
@@ -103,11 +102,8 @@ pub struct MacroPanic {
 
 impl ProcMacroServer {
     /// Spawns an external process as the proc macro server and returns a client connected to it.
-    pub fn spawn(
-        process_path: AbsPathBuf,
-        args: impl IntoIterator<Item = impl AsRef<OsStr>> + Clone,
-    ) -> io::Result<ProcMacroServer> {
-        let process = ProcMacroProcessSrv::run(process_path, args)?;
+    pub fn spawn(process_path: AbsPathBuf) -> io::Result<ProcMacroServer> {
+        let process = ProcMacroProcessSrv::run(process_path)?;
         Ok(ProcMacroServer { process: Arc::new(Mutex::new(process)) })
     }
 
diff --git a/crates/proc-macro-api/src/process.rs b/crates/proc-macro-api/src/process.rs
index a526a21831b..9a20fa63ed7 100644
--- a/crates/proc-macro-api/src/process.rs
+++ b/crates/proc-macro-api/src/process.rs
@@ -1,7 +1,6 @@
 //! Handle process life-time and message passing for proc-macro client
 
 use std::{
-    ffi::{OsStr, OsString},
     io::{self, BufRead, BufReader, Write},
     process::{Child, ChildStdin, ChildStdout, Command, Stdio},
 };
@@ -23,12 +22,9 @@ pub(crate) struct ProcMacroProcessSrv {
 }
 
 impl ProcMacroProcessSrv {
-    pub(crate) fn run(
-        process_path: AbsPathBuf,
-        args: impl IntoIterator<Item = impl AsRef<OsStr>> + Clone,
-    ) -> io::Result<ProcMacroProcessSrv> {
+    pub(crate) fn run(process_path: AbsPathBuf) -> io::Result<ProcMacroProcessSrv> {
         let create_srv = |null_stderr| {
-            let mut process = Process::run(process_path.clone(), args.clone(), null_stderr)?;
+            let mut process = Process::run(process_path.clone(), null_stderr)?;
             let (stdin, stdout) = process.stdio().expect("couldn't access child stdio");
 
             io::Result::Ok(ProcMacroProcessSrv { _process: process, stdin, stdout, version: 0 })
@@ -100,13 +96,8 @@ struct Process {
 }
 
 impl Process {
-    fn run(
-        path: AbsPathBuf,
-        args: impl IntoIterator<Item = impl AsRef<OsStr>>,
-        null_stderr: bool,
-    ) -> io::Result<Process> {
-        let args: Vec<OsString> = args.into_iter().map(|s| s.as_ref().into()).collect();
-        let child = JodChild(mk_child(&path, args, null_stderr)?);
+    fn run(path: AbsPathBuf, null_stderr: bool) -> io::Result<Process> {
+        let child = JodChild(mk_child(&path, null_stderr)?);
         Ok(Process { child })
     }
 
@@ -119,13 +110,8 @@ impl Process {
     }
 }
 
-fn mk_child(
-    path: &AbsPath,
-    args: impl IntoIterator<Item = impl AsRef<OsStr>>,
-    null_stderr: bool,
-) -> io::Result<Child> {
+fn mk_child(path: &AbsPath, null_stderr: bool) -> io::Result<Child> {
     Command::new(path.as_os_str())
-        .args(args)
         .env("RUST_ANALYZER_INTERNALS_DO_NOT_USE", "this is unstable")
         .stdin(Stdio::piped())
         .stdout(Stdio::piped())
diff --git a/crates/proc-macro-srv-cli/src/lib.rs b/crates/proc-macro-srv-cli/src/lib.rs
deleted file mode 100644
index b307701e19f..00000000000
--- a/crates/proc-macro-srv-cli/src/lib.rs
+++ /dev/null
@@ -1,54 +0,0 @@
-//! Driver for proc macro server
-use std::io;
-
-use proc_macro_api::msg::{self, Message};
-
-#[cfg(feature = "sysroot-abi")]
-pub fn run() -> io::Result<()> {
-    let mut srv = proc_macro_srv::ProcMacroSrv::default();
-    let mut buf = String::new();
-
-    while let Some(req) = read_request(&mut buf)? {
-        let res = match req {
-            msg::Request::ListMacros { dylib_path } => {
-                msg::Response::ListMacros(srv.list_macros(&dylib_path))
-            }
-            msg::Request::ExpandMacro(task) => msg::Response::ExpandMacro(srv.expand(task)),
-            msg::Request::ApiVersionCheck {} => {
-                msg::Response::ApiVersionCheck(proc_macro_api::msg::CURRENT_API_VERSION)
-            }
-        };
-        write_response(res)?
-    }
-
-    Ok(())
-}
-#[cfg(not(feature = "sysroot-abi"))]
-pub fn run() -> io::Result<()> {
-    let mut buf = String::new();
-
-    while let Some(req) = read_request(&mut buf)? {
-        let res = match req {
-            msg::Request::ListMacros { .. } => {
-                msg::Response::ListMacros(Err("server is built without sysroot support".to_owned()))
-            }
-            msg::Request::ExpandMacro(..) => msg::Response::ExpandMacro(Err(msg::PanicMessage(
-                "server is built without sysroot support".to_owned(),
-            ))),
-            msg::Request::ApiVersionCheck {} => {
-                msg::Response::ApiVersionCheck(proc_macro_api::msg::CURRENT_API_VERSION)
-            }
-        };
-        write_response(res)?
-    }
-
-    Ok(())
-}
-
-fn read_request(buf: &mut String) -> io::Result<Option<msg::Request>> {
-    msg::Request::read(&mut io::stdin().lock(), buf)
-}
-
-fn write_response(msg: msg::Response) -> io::Result<()> {
-    msg.write(&mut io::stdout().lock())
-}
diff --git a/crates/proc-macro-srv-cli/src/main.rs b/crates/proc-macro-srv-cli/src/main.rs
index cc83c60f15c..bece1951872 100644
--- a/crates/proc-macro-srv-cli/src/main.rs
+++ b/crates/proc-macro-srv-cli/src/main.rs
@@ -1,5 +1,6 @@
 //! A standalone binary for `proc-macro-srv`.
 //! Driver for proc macro server
+use std::io;
 
 fn main() -> std::io::Result<()> {
     let v = std::env::var("RUST_ANALYZER_INTERNALS_DO_NOT_USE");
@@ -14,5 +15,37 @@ fn main() -> std::io::Result<()> {
         }
     }
 
-    proc_macro_srv_cli::run()
+    run()
+}
+
+#[cfg(not(feature = "sysroot-abi"))]
+fn run() -> io::Result<()> {
+    panic!("proc-macro-srv-cli requires the `sysroot-abi` feature to be enabled");
+}
+
+#[cfg(feature = "sysroot-abi")]
+fn run() -> io::Result<()> {
+    use proc_macro_api::msg::{self, Message};
+
+    let read_request = |buf: &mut String| msg::Request::read(&mut io::stdin().lock(), buf);
+
+    let write_response = |msg: msg::Response| msg.write(&mut io::stdout().lock());
+
+    let mut srv = proc_macro_srv::ProcMacroSrv::default();
+    let mut buf = String::new();
+
+    while let Some(req) = read_request(&mut buf)? {
+        let res = match req {
+            msg::Request::ListMacros { dylib_path } => {
+                msg::Response::ListMacros(srv.list_macros(&dylib_path))
+            }
+            msg::Request::ExpandMacro(task) => msg::Response::ExpandMacro(srv.expand(task)),
+            msg::Request::ApiVersionCheck {} => {
+                msg::Response::ApiVersionCheck(proc_macro_api::msg::CURRENT_API_VERSION)
+            }
+        };
+        write_response(res)?
+    }
+
+    Ok(())
 }
diff --git a/crates/project-model/src/workspace.rs b/crates/project-model/src/workspace.rs
index 5518b6bc7f5..02fda6e6ea8 100644
--- a/crates/project-model/src/workspace.rs
+++ b/crates/project-model/src/workspace.rs
@@ -459,18 +459,35 @@ impl ProjectWorkspace {
         }
     }
 
-    pub fn find_sysroot_proc_macro_srv(&self) -> Option<AbsPathBuf> {
+    pub fn find_sysroot_proc_macro_srv(&self) -> Result<AbsPathBuf> {
         match self {
             ProjectWorkspace::Cargo { sysroot: Ok(sysroot), .. }
-            | ProjectWorkspace::Json { sysroot: Ok(sysroot), .. } => {
+            | ProjectWorkspace::Json { sysroot: Ok(sysroot), .. }
+            | ProjectWorkspace::DetachedFiles { sysroot: Ok(sysroot), .. } => {
                 let standalone_server_name =
                     format!("rust-analyzer-proc-macro-srv{}", std::env::consts::EXE_SUFFIX);
                 ["libexec", "lib"]
                     .into_iter()
                     .map(|segment| sysroot.root().join(segment).join(&standalone_server_name))
                     .find(|server_path| std::fs::metadata(server_path).is_ok())
+                    .ok_or_else(|| {
+                        anyhow::anyhow!(
+                            "cannot find proc-macro server in sysroot `{}`",
+                            sysroot.root().display()
+                        )
+                    })
+            }
+            ProjectWorkspace::DetachedFiles { .. } => {
+                Err(anyhow::anyhow!("cannot find proc-macro server, no sysroot was found"))
             }
-            _ => None,
+            ProjectWorkspace::Cargo { cargo, .. } => Err(anyhow::anyhow!(
+                "cannot find proc-macro-srv, the workspace `{}` is missing a sysroot",
+                cargo.workspace_root().display()
+            )),
+            ProjectWorkspace::Json { project, .. } => Err(anyhow::anyhow!(
+                "cannot find proc-macro-srv, the workspace `{}` is missing a sysroot",
+                project.path().display()
+            )),
         }
     }
 
diff --git a/crates/rust-analyzer/Cargo.toml b/crates/rust-analyzer/Cargo.toml
index e2a815fb7c5..ea4f155bfd5 100644
--- a/crates/rust-analyzer/Cargo.toml
+++ b/crates/rust-analyzer/Cargo.toml
@@ -67,7 +67,6 @@ ide-db.workspace = true
 ide-ssr.workspace = true
 ide.workspace = true
 proc-macro-api.workspace = true
-proc-macro-srv-cli.workspace = true
 profile.workspace = true
 project-model.workspace = true
 stdx.workspace = true
@@ -95,9 +94,7 @@ mbe.workspace = true
 [features]
 jemalloc = ["jemallocator", "profile/jemalloc"]
 force-always-assert = ["always-assert/force"]
-sysroot-abi = ["proc-macro-srv-cli/sysroot-abi"]
 in-rust-tree = [
-    "sysroot-abi",
     "ide/in-rust-tree",
     "syntax/in-rust-tree",
 ]
diff --git a/crates/rust-analyzer/src/bin/main.rs b/crates/rust-analyzer/src/bin/main.rs
index 3506bed2c74..9b416d1ef00 100644
--- a/crates/rust-analyzer/src/bin/main.rs
+++ b/crates/rust-analyzer/src/bin/main.rs
@@ -76,9 +76,6 @@ fn try_main(flags: flags::RustAnalyzer) -> Result<()> {
             }
             with_extra_thread("LspServer", run_server)?;
         }
-        flags::RustAnalyzerCmd::ProcMacro(flags::ProcMacro) => {
-            with_extra_thread("MacroExpander", || proc_macro_srv_cli::run().map_err(Into::into))?;
-        }
         flags::RustAnalyzerCmd::Parse(cmd) => cmd.run()?,
         flags::RustAnalyzerCmd::Symbols(cmd) => cmd.run()?,
         flags::RustAnalyzerCmd::Highlight(cmd) => cmd.run()?,
diff --git a/crates/rust-analyzer/src/cli/flags.rs b/crates/rust-analyzer/src/cli/flags.rs
index b085a0a892a..891d99c5ad5 100644
--- a/crates/rust-analyzer/src/cli/flags.rs
+++ b/crates/rust-analyzer/src/cli/flags.rs
@@ -106,8 +106,6 @@ xflags::xflags! {
             optional --debug snippet: String
         }
 
-        cmd proc-macro {}
-
         cmd lsif {
             required path: PathBuf
         }
@@ -141,7 +139,6 @@ pub enum RustAnalyzerCmd {
     Diagnostics(Diagnostics),
     Ssr(Ssr),
     Search(Search),
-    ProcMacro(ProcMacro),
     Lsif(Lsif),
     Scip(Scip),
 }
@@ -204,9 +201,6 @@ pub struct Search {
 }
 
 #[derive(Debug)]
-pub struct ProcMacro;
-
-#[derive(Debug)]
 pub struct Lsif {
     pub path: PathBuf,
 }
diff --git a/crates/rust-analyzer/src/cli/load_cargo.rs b/crates/rust-analyzer/src/cli/load_cargo.rs
index 33c1b36f228..625f1f2b193 100644
--- a/crates/rust-analyzer/src/cli/load_cargo.rs
+++ b/crates/rust-analyzer/src/cli/load_cargo.rs
@@ -1,8 +1,8 @@
 //! Loads a Cargo project into a static instance of analysis, without support
 //! for incorporating changes.
-use std::{convert::identity, path::Path, sync::Arc};
+use std::{path::Path, sync::Arc};
 
-use anyhow::Result;
+use anyhow::{anyhow, Result};
 use crossbeam_channel::{unbounded, Receiver};
 use ide::{AnalysisHost, Change};
 use ide_db::{
@@ -26,7 +26,7 @@ pub struct LoadCargoConfig {
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum ProcMacroServerChoice {
     Sysroot,
-    Explicit(AbsPathBuf, Vec<String>),
+    Explicit(AbsPathBuf),
     None,
 }
 
@@ -71,14 +71,11 @@ pub fn load_workspace(
     let proc_macro_server = match &load_config.with_proc_macro_server {
         ProcMacroServerChoice::Sysroot => ws
             .find_sysroot_proc_macro_srv()
-            .ok_or_else(|| "failed to find sysroot proc-macro server".to_owned())
-            .and_then(|it| {
-                ProcMacroServer::spawn(it, identity::<&[&str]>(&[])).map_err(|e| e.to_string())
-            }),
-        ProcMacroServerChoice::Explicit(path, args) => {
-            ProcMacroServer::spawn(path.clone(), args).map_err(|e| e.to_string())
+            .and_then(|it| ProcMacroServer::spawn(it).map_err(Into::into)),
+        ProcMacroServerChoice::Explicit(path) => {
+            ProcMacroServer::spawn(path.clone()).map_err(Into::into)
         }
-        ProcMacroServerChoice::None => Err("proc macro server disabled".to_owned()),
+        ProcMacroServerChoice::None => Err(anyhow!("proc macro server disabled")),
     };
 
     let (crate_graph, proc_macros) = ws.to_crate_graph(
@@ -93,7 +90,7 @@ pub fn load_workspace(
     let proc_macros = {
         let proc_macro_server = match &proc_macro_server {
             Ok(it) => Ok(it),
-            Err(e) => Err(e.as_str()),
+            Err(e) => Err(e.to_string()),
         };
         proc_macros
             .into_iter()
@@ -102,7 +99,11 @@ pub fn load_workspace(
                     crate_id,
                     path.map_or_else(
                         |_| Err("proc macro crate is missing dylib".to_owned()),
-                        |(_, path)| load_proc_macro(proc_macro_server, &path, &[]),
+                        |(_, path)| {
+                            proc_macro_server.as_ref().map_err(Clone::clone).and_then(
+                                |proc_macro_server| load_proc_macro(proc_macro_server, &path, &[]),
+                            )
+                        },
                     ),
                 )
             })
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 37a8f353636..89ca8e63567 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -437,8 +437,7 @@ config_data! {
         ///
         /// This config takes a map of crate names with the exported proc-macro names to ignore as values.
         procMacro_ignored: FxHashMap<Box<str>, Box<[Box<str>]>>          = "{}",
-        /// Internal config, path to proc-macro server executable (typically,
-        /// this is rust-analyzer itself, but we override this in tests).
+        /// Internal config, path to proc-macro server executable.
         procMacro_server: Option<PathBuf>          = "null",
 
         /// Exclude imports from find-all-references.
@@ -1102,17 +1101,13 @@ impl Config {
         self.data.lru_query_capacities.is_empty().not().then(|| &self.data.lru_query_capacities)
     }
 
-    pub fn proc_macro_srv(&self) -> Option<(AbsPathBuf, /* is path explicitly set */ bool)> {
-        if !self.data.procMacro_enable {
-            return None;
-        }
-        Some(match &self.data.procMacro_server {
-            Some(it) => (
-                AbsPathBuf::try_from(it.clone()).unwrap_or_else(|path| self.root_path.join(path)),
-                true,
-            ),
-            None => (AbsPathBuf::assert(std::env::current_exe().ok()?), false),
-        })
+    pub fn proc_macro_srv(&self) -> Option<AbsPathBuf> {
+        self.data
+            .procMacro_server
+            .clone()
+            .map(AbsPathBuf::try_from)?
+            .ok()
+            .map(|path| self.root_path.join(path))
     }
 
     pub fn dummy_replacements(&self) -> &FxHashMap<Box<str>, Box<[Box<str>]>> {
diff --git a/crates/rust-analyzer/src/global_state.rs b/crates/rust-analyzer/src/global_state.rs
index cd449bad163..07778d2b59f 100644
--- a/crates/rust-analyzer/src/global_state.rs
+++ b/crates/rust-analyzer/src/global_state.rs
@@ -63,7 +63,7 @@ pub(crate) struct GlobalState {
     pub(crate) source_root_config: SourceRootConfig,
 
     pub(crate) proc_macro_changed: bool,
-    pub(crate) proc_macro_clients: Arc<[Result<ProcMacroServer, String>]>,
+    pub(crate) proc_macro_clients: Arc<[anyhow::Result<ProcMacroServer>]>,
 
     pub(crate) flycheck: Arc<[FlycheckHandle]>,
     pub(crate) flycheck_sender: Sender<flycheck::Message>,
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index ef319d9b77f..4d840e11df7 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -283,8 +283,8 @@ impl GlobalState {
             let mut res = FxHashMap::default();
             let chain = proc_macro_clients
                 .iter()
-                .map(|res| res.as_ref().map_err(|e| &**e))
-                .chain(iter::repeat_with(|| Err("Proc macros servers are not running")));
+                .map(|res| res.as_ref().map_err(|e| e.to_string()))
+                .chain(iter::repeat_with(|| Err("Proc macros servers are not running".into())));
             for (client, paths) in chain.zip(paths) {
                 res.extend(paths.into_iter().map(move |(crate_id, res)| {
                     (
@@ -293,16 +293,18 @@ impl GlobalState {
                             |_| Err("proc macro crate is missing dylib".to_owned()),
                             |(crate_name, path)| {
                                 progress(path.display().to_string());
-                                load_proc_macro(
-                                    client,
-                                    &path,
-                                    crate_name
-                                        .as_deref()
-                                        .and_then(|crate_name| {
-                                            dummy_replacements.get(crate_name).map(|v| &**v)
-                                        })
-                                        .unwrap_or_default(),
-                                )
+                                client.as_ref().map_err(Clone::clone).and_then(|client| {
+                                    load_proc_macro(
+                                        client,
+                                        &path,
+                                        crate_name
+                                            .as_deref()
+                                            .and_then(|crate_name| {
+                                                dummy_replacements.get(crate_name).map(|v| &**v)
+                                            })
+                                            .unwrap_or_default(),
+                                    )
+                                })
                             },
                         ),
                     )
@@ -410,39 +412,25 @@ impl GlobalState {
         let project_folders = ProjectFolders::new(&self.workspaces, &files_config.exclude);
 
         if self.proc_macro_clients.is_empty() || !same_workspaces {
-            if let Some((path, path_manually_set)) = self.config.proc_macro_srv() {
+            if self.config.expand_proc_macros() {
                 tracing::info!("Spawning proc-macro servers");
+
                 self.proc_macro_clients = self
                     .workspaces
                     .iter()
                     .map(|ws| {
-                        let path = if path_manually_set {
-                            tracing::debug!(
-                                "Pro-macro server path explicitly set: {}",
-                                path.display()
-                            );
-                            path.clone()
-                        } else {
-                            match ws.find_sysroot_proc_macro_srv() {
-                                Some(server_path) => server_path,
-                                None => path.clone(),
-                            }
-                        };
-                        let args: &[_] = if path.file_stem() == Some("rust-analyzer".as_ref()) {
-                            &["proc-macro"]
-                        } else {
-                            &[]
+                        let path = match self.config.proc_macro_srv() {
+                            Some(path) => path,
+                            None => ws.find_sysroot_proc_macro_srv()?,
                         };
 
-                        tracing::info!(?args, "Using proc-macro server at {}", path.display(),);
-                        ProcMacroServer::spawn(path.clone(), args).map_err(|err| {
-                            let error = format!(
+                        tracing::info!("Using proc-macro server at {}", path.display(),);
+                        ProcMacroServer::spawn(path.clone()).map_err(|err| {
+                            anyhow::anyhow!(
                                 "Failed to run proc-macro server from path {}, error: {:?}",
                                 path.display(),
                                 err
-                            );
-                            tracing::error!(error);
-                            error
+                            )
                         })
                     })
                     .collect()
@@ -740,11 +728,10 @@ impl SourceRootConfig {
 /// Load the proc-macros for the given lib path, replacing all expanders whose names are in `dummy_replace`
 /// with an identity dummy expander.
 pub(crate) fn load_proc_macro(
-    server: Result<&ProcMacroServer, &str>,
+    server: &ProcMacroServer,
     path: &AbsPath,
     dummy_replace: &[Box<str>],
 ) -> ProcMacroLoadResult {
-    let server = server.map_err(ToOwned::to_owned)?;
     let res: Result<Vec<_>, String> = (|| {
         let dylib = MacroDylib::new(path.to_path_buf());
         let vec = server.load_dylib(dylib).map_err(|e| format!("{e}"))?;
diff --git a/docs/user/generated_config.adoc b/docs/user/generated_config.adoc
index 0c3432e9036..e9b3d45a373 100644
--- a/docs/user/generated_config.adoc
+++ b/docs/user/generated_config.adoc
@@ -679,8 +679,7 @@ This config takes a map of crate names with the exported proc-macro names to ign
 [[rust-analyzer.procMacro.server]]rust-analyzer.procMacro.server (default: `null`)::
 +
 --
-Internal config, path to proc-macro server executable (typically,
-this is rust-analyzer itself, but we override this in tests).
+Internal config, path to proc-macro server executable.
 --
 [[rust-analyzer.references.excludeImports]]rust-analyzer.references.excludeImports (default: `false`)::
 +
diff --git a/editors/code/package.json b/editors/code/package.json
index f6ad2f7908f..c164595aff8 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -1305,7 +1305,7 @@
                     "type": "object"
                 },
                 "rust-analyzer.procMacro.server": {
-                    "markdownDescription": "Internal config, path to proc-macro server executable (typically,\nthis is rust-analyzer itself, but we override this in tests).",
+                    "markdownDescription": "Internal config, path to proc-macro server executable.",
                     "default": null,
                     "type": [
                         "null",