Cacheproc-macro dlls

crates/ra_proc_macro_srv/src/cli.rs

@@ -1,15 +1,17 @@
 //! Driver for proc macro server
 
-use crate::{expand_task, list_macros};
+use crate::ProcMacroSrv;
 use ra_proc_macro::msg::{self, Message};
 use std::io;
 
 pub fn run() -> io::Result<()> {
+    let mut srv = ProcMacroSrv::default();
+
     while let Some(req) = read_request()? {
         let res = match req {
-            msg::Request::ListMacro(task) => Ok(msg::Response::ListMacro(list_macros(&task))),
+            msg::Request::ListMacro(task) => srv.list_macros(&task).map(msg::Response::ListMacro),
             msg::Request::ExpansionMacro(task) => {
-                expand_task(&task).map(msg::Response::ExpansionMacro)
+                srv.expand(&task).map(msg::Response::ExpansionMacro)
             }
         };
 

crates/ra_proc_macro_srv/src/dylib.rs

@@ -112,7 +112,7 @@ impl ProcMacroLibraryLibloading {
 type ProcMacroLibraryImpl = ProcMacroLibraryLibloading;
 
 pub struct Expander {
-    libs: Vec<ProcMacroLibraryImpl>,
+    inner: ProcMacroLibraryImpl,
 }
 
 impl Expander {
@@ -125,7 +125,7 @@ impl Expander {
 
         let library = ProcMacroLibraryImpl::open(&lib).map_err(|e| e.to_string())?;
 
-        Ok(Expander { libs: vec![library] })
+        Ok(Expander { inner: library })
     }
 
     pub fn expand(
@@ -141,8 +141,7 @@ impl Expander {
                 TokenStream::with_subtree(attr.clone())
             });
 
-        for lib in &self.libs {
-            for proc_macro in &lib.exported_macros {
+        for proc_macro in &self.inner.exported_macros {
             match proc_macro {
                 bridge::client::ProcMacro::CustomDerive { trait_name, client, .. }
                     if *trait_name == macro_name =>
@@ -174,15 +173,14 @@ impl Expander {
                 _ => continue,
             }
         }
-        }
 
         Err(bridge::PanicMessage::String("Nothing to expand".to_string()))
     }
 
     pub fn list_macros(&self) -> Vec<(String, ProcMacroKind)> {
-        self.libs
+        self.inner
+            .exported_macros
             .iter()
-            .flat_map(|it| &it.exported_macros)
             .map(|proc_macro| match proc_macro {
                 bridge::client::ProcMacro::CustomDerive { trait_name, .. } => {
                     (trait_name.to_string(), ProcMacroKind::CustomDerive)

crates/ra_proc_macro_srv/src/lib.rs

@@ -21,28 +21,40 @@ mod dylib;
 
 use proc_macro::bridge::client::TokenStream;
 use ra_proc_macro::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask};
-use std::path::Path;
+use std::{
+    collections::{hash_map::Entry, HashMap},
+    path::{Path, PathBuf},
+};
 
-pub(crate) fn expand_task(task: &ExpansionTask) -> Result<ExpansionResult, String> {
-    let expander = create_expander(&task.lib);
+#[derive(Default)]
+pub(crate) struct ProcMacroSrv {
+    expanders: HashMap<PathBuf, dylib::Expander>,
+}
 
+impl ProcMacroSrv {
+    pub fn expand(&mut self, task: &ExpansionTask) -> Result<ExpansionResult, String> {
+        let expander = self.expander(&task.lib)?;
         match expander.expand(&task.macro_name, &task.macro_body, task.attributes.as_ref()) {
             Ok(expansion) => Ok(ExpansionResult { expansion }),
             Err(msg) => {
                 Err(format!("Cannot perform expansion for {}: error {:?}", &task.macro_name, msg))
             }
         }
-}
+    }
 
-pub(crate) fn list_macros(task: &ListMacrosTask) -> ListMacrosResult {
-    let expander = create_expander(&task.lib);
+    pub fn list_macros(&mut self, task: &ListMacrosTask) -> Result<ListMacrosResult, String> {
+        let expander = self.expander(&task.lib)?;
+        Ok(ListMacrosResult { macros: expander.list_macros() })
+    }
 
-    ListMacrosResult { macros: expander.list_macros() }
-}
-
-fn create_expander(lib: &Path) -> dylib::Expander {
-    dylib::Expander::new(lib)
-        .unwrap_or_else(|err| panic!("Cannot create expander for {}: {:?}", lib.display(), err))
+    fn expander(&mut self, path: &Path) -> Result<&dylib::Expander, String> {
+        Ok(match self.expanders.entry(path.to_path_buf()) {
+            Entry::Vacant(v) => v.insert(dylib::Expander::new(path).map_err(|err| {
+                format!("Cannot create expander for {}: {:?}", path.display(), err)
+            })?),
+            Entry::Occupied(e) => e.into_mut(),
+        })
+    }
 }
 
 pub mod cli;

crates/ra_proc_macro_srv/src/tests/utils.rs

@@ -1,7 +1,7 @@
 //! utils used in proc-macro tests
 
 use crate::dylib;
-use crate::list_macros;
+use crate::ProcMacroSrv;
 pub use difference::Changeset as __Changeset;
 use ra_proc_macro::ListMacrosTask;
 use std::str::FromStr;
@@ -59,7 +59,7 @@ pub fn assert_expand(
 pub fn list(crate_name: &str, version: &str) -> Vec<String> {
     let path = fixtures::dylib_path(crate_name, version);
     let task = ListMacrosTask { lib: path };
-
-    let res = list_macros(&task);
+    let mut srv = ProcMacroSrv::default();
+    let res = srv.list_macros(&task).unwrap();
     res.macros.into_iter().map(|(name, kind)| format!("{} [{:?}]", name, kind)).collect()
 }