6 files changed, 30 insertions, 22 deletions

diff --git a/Cargo.lock b/Cargo.lock
index f1847e769..b73fb909c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1187,6 +1187,7 @@ dependencies = [
 name = "proc_macro_api"
 version = "0.0.0"
 dependencies = [
+ "base_db",
  "crossbeam-channel 0.5.0",
  "jod-thread",
  "log",
diff --git a/crates/base_db/src/input.rs b/crates/base_db/src/input.rs
index 98ba372ad..cda5e57dc 100644
--- a/crates/base_db/src/input.rs
+++ b/crates/base_db/src/input.rs
@@ -143,9 +143,17 @@ impl CrateDisplayName {
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct ProcMacroId(pub u32);
 
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum ProcMacroKind {
+    CustomDerive,
+    FuncLike,
+    Attr,
+}
+
 #[derive(Debug, Clone)]
 pub struct ProcMacro {
     pub name: SmolStr,
+    pub kind: ProcMacroKind,
     pub expander: Arc<dyn TokenExpander>,
 }
 
@@ -198,11 +206,8 @@ impl CrateGraph {
         display_name: Option<CrateDisplayName>,
         cfg_options: CfgOptions,
         env: Env,
-        proc_macro: Vec<(SmolStr, Arc<dyn tt::TokenExpander>)>,
+        proc_macro: Vec<ProcMacro>,
     ) -> CrateId {
-        let proc_macro =
-            proc_macro.into_iter().map(|(name, it)| ProcMacro { name, expander: it }).collect();
-
         let data = CrateData {
             root_file_id: file_id,
             edition,
diff --git a/crates/base_db/src/lib.rs b/crates/base_db/src/lib.rs
index ce75a5337..5571af495 100644
--- a/crates/base_db/src/lib.rs
+++ b/crates/base_db/src/lib.rs
@@ -14,7 +14,7 @@ pub use crate::{
     change::Change,
     input::{
         CrateData, CrateDisplayName, CrateGraph, CrateId, CrateName, Dependency, Edition, Env,
-        ProcMacroId, SourceRoot, SourceRootId,
+        ProcMacro, ProcMacroId, ProcMacroKind, SourceRoot, SourceRootId,
     },
 };
 pub use salsa;
diff --git a/crates/proc_macro_api/Cargo.toml b/crates/proc_macro_api/Cargo.toml
index 3863e5189..1af2bbca7 100644
--- a/crates/proc_macro_api/Cargo.toml
+++ b/crates/proc_macro_api/Cargo.toml
@@ -17,3 +17,4 @@ crossbeam-channel = "0.5.0"
 jod-thread = "0.1.1"
 
 tt = { path = "../tt", version = "0.0.0" }
+base_db = { path = "../base_db", version = "0.0.0" }
diff --git a/crates/proc_macro_api/src/lib.rs b/crates/proc_macro_api/src/lib.rs
index 40fdbfd5a..bf1f90879 100644
--- a/crates/proc_macro_api/src/lib.rs
+++ b/crates/proc_macro_api/src/lib.rs
@@ -16,6 +16,7 @@ use std::{
     sync::Arc,
 };
 
+use base_db::ProcMacro;
 use tt::{SmolStr, Subtree};
 
 use crate::process::{ProcMacroProcessSrv, ProcMacroProcessThread};
@@ -82,7 +83,7 @@ impl ProcMacroClient {
         ProcMacroClient { kind: ProcMacroClientKind::Dummy }
     }
 
-    pub fn by_dylib_path(&self, dylib_path: &Path) -> Vec<(SmolStr, Arc<dyn tt::TokenExpander>)> {
+    pub fn by_dylib_path(&self, dylib_path: &Path) -> Vec<ProcMacro> {
         match &self.kind {
             ProcMacroClientKind::Dummy => vec![],
             ProcMacroClientKind::Process { process, .. } => {
@@ -96,21 +97,21 @@ impl ProcMacroClient {
 
                 macros
                     .into_iter()
-                    .filter_map(|(name, kind)| {
-                        match kind {
-                            ProcMacroKind::CustomDerive | ProcMacroKind::FuncLike => {
-                                let name = SmolStr::new(&name);
-                                let expander: Arc<dyn tt::TokenExpander> =
-                                    Arc::new(ProcMacroProcessExpander {
-                                        process: process.clone(),
-                                        name: name.clone(),
-                                        dylib_path: dylib_path.into(),
-                                    });
-                                Some((name, expander))
-                            }
-                            // FIXME: Attribute macro are currently unsupported.
-                            ProcMacroKind::Attr => None,
-                        }
+                    .map(|(name, kind)| {
+                        let name = SmolStr::new(&name);
+                        let kind = match kind {
+                            ProcMacroKind::CustomDerive => base_db::ProcMacroKind::CustomDerive,
+                            ProcMacroKind::FuncLike => base_db::ProcMacroKind::FuncLike,
+                            ProcMacroKind::Attr => base_db::ProcMacroKind::Attr,
+                        };
+                        let expander: Arc<dyn tt::TokenExpander> =
+                            Arc::new(ProcMacroProcessExpander {
+                                process: process.clone(),
+                                name: name.clone(),
+                                dylib_path: dylib_path.into(),
+                            });
+
+                        ProcMacro { name, kind, expander }
                     })
                     .collect()
             }
diff --git a/crates/proc_macro_api/src/rpc.rs b/crates/proc_macro_api/src/rpc.rs
index 203109ca4..b85f92eea 100644
--- a/crates/proc_macro_api/src/rpc.rs
+++ b/crates/proc_macro_api/src/rpc.rs
@@ -19,7 +19,7 @@ pub struct ListMacrosTask {
     pub lib: PathBuf,
 }
 
-#[derive(Clone, Eq, PartialEq, Debug, Serialize, Deserialize)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Serialize, Deserialize)]
 pub enum ProcMacroKind {
     CustomDerive,
     FuncLike,