6 files changed, 71 insertions, 51 deletions

diff --git a/crates/hir_expand/src/builtin_derive.rs b/crates/hir_expand/src/builtin_derive.rs
index 5e908b223..60fd2ebdd 100644
--- a/crates/hir_expand/src/builtin_derive.rs
+++ b/crates/hir_expand/src/builtin_derive.rs
@@ -61,8 +61,7 @@ pub fn find_builtin_derive(
     let expander = BuiltinDeriveExpander::find_by_name(ident)?;
     Some(MacroDefId {
         krate,
-        ast_id: Some(ast_id),
-        kind: MacroDefKind::BuiltInDerive(expander),
+        kind: MacroDefKind::BuiltInDerive(expander, ast_id),
         local_inner: false,
     })
 }
@@ -268,14 +267,13 @@ fn partial_ord_expand(
 mod tests {
     use base_db::{fixture::WithFixture, CrateId, SourceDatabase};
     use expect_test::{expect, Expect};
-    use name::{known, Name};
+    use name::AsName;
 
     use crate::{test_db::TestDB, AstId, MacroCallId, MacroCallKind, MacroCallLoc};
 
     use super::*;
 
-    fn expand_builtin_derive(ra_fixture: &str, name: Name) -> String {
-        let expander = BuiltinDeriveExpander::find_by_name(&name).unwrap();
+    fn expand_builtin_derive(ra_fixture: &str) -> String {
         let fixture = format!(
             r#"//- /main.rs crate:main deps:core
 $0
@@ -288,19 +286,34 @@ $0
 
         let (db, file_pos) = TestDB::with_position(&fixture);
         let file_id = file_pos.file_id;
+        let ast_id_map = db.ast_id_map(file_id.into());
         let parsed = db.parse(file_id);
-        let items: Vec<_> =
-            parsed.syntax_node().descendants().filter_map(ast::Item::cast).collect();
+        let macros: Vec<_> =
+            parsed.syntax_node().descendants().filter_map(ast::Macro::cast).collect();
+        let items: Vec<_> = parsed
+            .syntax_node()
+            .descendants()
+            .filter(|node| !ast::Macro::can_cast(node.kind()))
+            .filter_map(ast::Item::cast)
+            .collect();
+
+        assert_eq!(macros.len(), 1, "test must contain exactly 1 macro definition");
+        assert_eq!(items.len(), 1, "test must contain exactly 1 item");
+
+        let macro_ast_id = AstId::new(file_id.into(), ast_id_map.ast_id(&macros[0]));
+        let name = match &macros[0] {
+            ast::Macro::MacroRules(rules) => rules.name().unwrap().as_name(),
+            ast::Macro::MacroDef(def) => def.name().unwrap().as_name(),
+        };
 
-        let ast_id_map = db.ast_id_map(file_id.into());
+        let expander = BuiltinDeriveExpander::find_by_name(&name).unwrap();
 
         let attr_id = AstId::new(file_id.into(), ast_id_map.ast_id(&items[0]));
 
         let loc = MacroCallLoc {
             def: MacroDefId {
                 krate: CrateId(0),
-                ast_id: None,
-                kind: MacroDefKind::BuiltInDerive(expander),
+                kind: MacroDefKind::BuiltInDerive(expander, macro_ast_id),
                 local_inner: false,
             },
             krate: CrateId(0),
@@ -315,8 +328,8 @@ $0
         parsed.text().to_string()
     }
 
-    fn check_derive(ra_fixture: &str, name: Name, expected: Expect) {
-        let expanded = expand_builtin_derive(ra_fixture, name);
+    fn check_derive(ra_fixture: &str, expected: Expect) {
+        let expanded = expand_builtin_derive(ra_fixture);
         expected.assert_eq(&expanded);
     }
 
@@ -324,10 +337,10 @@ $0
     fn test_copy_expand_simple() {
         check_derive(
             r#"
+            macro Copy {}
             #[derive(Copy)]
             struct Foo;
             "#,
-            known::Copy,
             expect![["impl< >core::marker::CopyforFoo< >{}"]],
         );
     }
@@ -336,10 +349,10 @@ $0
     fn test_copy_expand_with_type_params() {
         check_derive(
             r#"
+            macro Copy {}
             #[derive(Copy)]
             struct Foo<A, B>;
             "#,
-            known::Copy,
             expect![["impl<T0:core::marker::Copy,T1:core::marker::Copy>core::marker::CopyforFoo<T0,T1>{}"]],
         );
     }
@@ -348,10 +361,10 @@ $0
     fn test_copy_expand_with_lifetimes() {
         check_derive(
             r#"
+            macro Copy {}
             #[derive(Copy)]
             struct Foo<A, B, 'a, 'b>;
             "#,
-            known::Copy,
             // We currently just ignore lifetimes
             expect![["impl<T0:core::marker::Copy,T1:core::marker::Copy>core::marker::CopyforFoo<T0,T1>{}"]],
         );
@@ -361,10 +374,10 @@ $0
     fn test_clone_expand() {
         check_derive(
             r#"
+            macro Clone {}
             #[derive(Clone)]
             struct Foo<A, B>;
             "#,
-            known::Clone,
             expect![["impl<T0:core::clone::Clone,T1:core::clone::Clone>core::clone::CloneforFoo<T0,T1>{}"]],
         );
     }
diff --git a/crates/hir_expand/src/builtin_macro.rs b/crates/hir_expand/src/builtin_macro.rs
index fce09a9e7..8529b43b6 100644
--- a/crates/hir_expand/src/builtin_macro.rs
+++ b/crates/hir_expand/src/builtin_macro.rs
@@ -71,14 +71,12 @@ pub fn find_builtin_macro(
     match kind {
         Either::Left(kind) => Some(MacroDefId {
             krate,
-            ast_id: Some(ast_id),
-            kind: MacroDefKind::BuiltIn(kind),
+            kind: MacroDefKind::BuiltIn(kind, ast_id),
             local_inner: false,
         }),
         Either::Right(kind) => Some(MacroDefId {
             krate,
-            ast_id: Some(ast_id),
-            kind: MacroDefKind::BuiltInEager(kind),
+            kind: MacroDefKind::BuiltInEager(kind, ast_id),
             local_inner: false,
         }),
     }
@@ -512,6 +510,7 @@ mod tests {
         let macro_call = macro_calls.pop().unwrap();
 
         let expander = find_by_name(&macro_rules.name().unwrap().as_name()).unwrap();
+        let ast_id = AstId::new(file_id.into(), ast_id_map.ast_id(&macro_rules));
 
         let krate = CrateId(0);
         let file_id = match expander {
@@ -519,8 +518,7 @@ mod tests {
                 // the first one should be a macro_rules
                 let def = MacroDefId {
                     krate: CrateId(0),
-                    ast_id: Some(AstId::new(file_id.into(), ast_id_map.ast_id(&macro_rules))),
-                    kind: MacroDefKind::BuiltIn(expander),
+                    kind: MacroDefKind::BuiltIn(expander, ast_id),
                     local_inner: false,
                 };
 
@@ -540,8 +538,7 @@ mod tests {
                 // the first one should be a macro_rules
                 let def = MacroDefId {
                     krate,
-                    ast_id: Some(AstId::new(file_id.into(), ast_id_map.ast_id(&macro_rules))),
-                    kind: MacroDefKind::BuiltInEager(expander),
+                    kind: MacroDefKind::BuiltInEager(expander, ast_id),
                     local_inner: false,
                 };
 
diff --git a/crates/hir_expand/src/db.rs b/crates/hir_expand/src/db.rs
index a3070f1f9..2748e25cf 100644
--- a/crates/hir_expand/src/db.rs
+++ b/crates/hir_expand/src/db.rs
@@ -130,8 +130,8 @@ fn ast_id_map(db: &dyn AstDatabase, file_id: HirFileId) -> Arc<AstIdMap> {
 
 fn macro_def(db: &dyn AstDatabase, id: MacroDefId) -> Option<Arc<(TokenExpander, mbe::TokenMap)>> {
     match id.kind {
-        MacroDefKind::Declarative => {
-            let macro_rules = match id.ast_id?.to_node(db) {
+        MacroDefKind::Declarative(ast_id) => {
+            let macro_rules = match ast_id.to_node(db) {
                 syntax::ast::Macro::MacroRules(mac) => mac,
                 syntax::ast::Macro::MacroDef(_) => return None,
             };
@@ -150,14 +150,14 @@ fn macro_def(db: &dyn AstDatabase, id: MacroDefId) -> Option<Arc<(TokenExpander,
             };
             Some(Arc::new((TokenExpander::MacroRules(rules), tmap)))
         }
-        MacroDefKind::BuiltIn(expander) => {
+        MacroDefKind::BuiltIn(expander, _) => {
             Some(Arc::new((TokenExpander::Builtin(expander), mbe::TokenMap::default())))
         }
-        MacroDefKind::BuiltInDerive(expander) => {
+        MacroDefKind::BuiltInDerive(expander, _) => {
             Some(Arc::new((TokenExpander::BuiltinDerive(expander), mbe::TokenMap::default())))
         }
-        MacroDefKind::BuiltInEager(_) => None,
-        MacroDefKind::ProcMacro(expander) => {
+        MacroDefKind::BuiltInEager(..) => None,
+        MacroDefKind::ProcMacro(expander, ..) => {
             Some(Arc::new((TokenExpander::ProcMacro(expander), mbe::TokenMap::default())))
         }
     }
@@ -269,7 +269,7 @@ fn expand_proc_macro(
     };
 
     let expander = match loc.def.kind {
-        MacroDefKind::ProcMacro(expander) => expander,
+        MacroDefKind::ProcMacro(expander, ..) => expander,
         _ => unreachable!(),
     };
 
diff --git a/crates/hir_expand/src/eager.rs b/crates/hir_expand/src/eager.rs
index dc618a9ee..04f374a29 100644
--- a/crates/hir_expand/src/eager.rs
+++ b/crates/hir_expand/src/eager.rs
@@ -140,7 +140,7 @@ pub fn expand_eager_macro(
     let subtree =
         diagnostic_sink.option(to_subtree(&result), || err("failed to parse macro result"))?;
 
-    if let MacroDefKind::BuiltInEager(eager) = def.kind {
+    if let MacroDefKind::BuiltInEager(eager, _) = def.kind {
         let res = eager.expand(db, arg_id, &subtree);
 
         let (subtree, fragment) = diagnostic_sink.expand_result_option(res)?;
@@ -193,7 +193,7 @@ fn eager_macro_recur(
         let def = diagnostic_sink
             .option_with(|| macro_resolver(child.path()?), || err("failed to resolve macro"))?;
         let insert = match def.kind {
-            MacroDefKind::BuiltInEager(_) => {
+            MacroDefKind::BuiltInEager(..) => {
                 let id: MacroCallId = expand_eager_macro(
                     db,
                     krate,
@@ -206,10 +206,10 @@ fn eager_macro_recur(
                 db.parse_or_expand(id.as_file())
                     .expect("successful macro expansion should be parseable")
             }
-            MacroDefKind::Declarative
-            | MacroDefKind::BuiltIn(_)
-            | MacroDefKind::BuiltInDerive(_)
-            | MacroDefKind::ProcMacro(_) => {
+            MacroDefKind::Declarative(_)
+            | MacroDefKind::BuiltIn(..)
+            | MacroDefKind::BuiltInDerive(..)
+            | MacroDefKind::ProcMacro(..) => {
                 let res = lazy_expand(db, &def, curr.with_value(child.clone()), krate);
                 let val = diagnostic_sink.expand_result_option(res)?;
 
diff --git a/crates/hir_expand/src/hygiene.rs b/crates/hir_expand/src/hygiene.rs
index 87cad326d..20cda1683 100644
--- a/crates/hir_expand/src/hygiene.rs
+++ b/crates/hir_expand/src/hygiene.rs
@@ -145,7 +145,7 @@ fn make_hygiene_info(
 ) -> Option<HygieneInfo> {
     let arg_tt = loc.kind.arg(db)?;
 
-    let def_offset = loc.def.ast_id.and_then(|id| {
+    let def_offset = loc.def.ast_id().and_then(|id| {
         let def_tt = match id.to_node(db) {
             ast::Macro::MacroRules(mac) => mac.token_tree()?.syntax().text_range().start(),
             ast::Macro::MacroDef(_) => return None,
@@ -176,13 +176,13 @@ impl HygieneFrame {
                     let loc = db.lookup_intern_macro(id);
                     let info = make_hygiene_info(db, macro_file, &loc);
                     match loc.def.kind {
-                        MacroDefKind::Declarative => {
+                        MacroDefKind::Declarative(_) => {
                             (info, Some(loc.def.krate), loc.def.local_inner)
                         }
-                        MacroDefKind::BuiltIn(_) => (info, Some(loc.def.krate), false),
-                        MacroDefKind::BuiltInDerive(_) => (info, None, false),
-                        MacroDefKind::BuiltInEager(_) => (info, None, false),
-                        MacroDefKind::ProcMacro(_) => (info, None, false),
+                        MacroDefKind::BuiltIn(..) => (info, Some(loc.def.krate), false),
+                        MacroDefKind::BuiltInDerive(..) => (info, None, false),
+                        MacroDefKind::BuiltInEager(..) => (info, None, false),
+                        MacroDefKind::ProcMacro(..) => (info, None, false),
                     }
                 }
             },
diff --git a/crates/hir_expand/src/lib.rs b/crates/hir_expand/src/lib.rs
index 7532d00b8..0a379651f 100644
--- a/crates/hir_expand/src/lib.rs
+++ b/crates/hir_expand/src/lib.rs
@@ -143,7 +143,7 @@ impl HirFileId {
 
                 let arg_tt = loc.kind.arg(db)?;
 
-                let def = loc.def.ast_id.and_then(|id| {
+                let def = loc.def.ast_id().and_then(|id| {
                     let def_tt = match id.to_node(db) {
                         ast::Macro::MacroRules(mac) => mac.token_tree()?,
                         ast::Macro::MacroDef(_) => return None,
@@ -180,7 +180,7 @@ impl HirFileId {
                 };
                 let loc: MacroCallLoc = db.lookup_intern_macro(lazy_id);
                 let item = match loc.def.kind {
-                    MacroDefKind::BuiltInDerive(_) => loc.kind.node(db),
+                    MacroDefKind::BuiltInDerive(..) => loc.kind.node(db),
                     _ => return None,
                 };
                 Some(item.with_value(ast::Item::cast(item.value.clone())?))
@@ -224,7 +224,6 @@ impl From<EagerMacroId> for MacroCallId {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct MacroDefId {
     pub krate: CrateId,
-    pub ast_id: Option<AstId<ast::Macro>>,
     pub kind: MacroDefKind,
 
     pub local_inner: bool,
@@ -239,16 +238,27 @@ impl MacroDefId {
     ) -> LazyMacroId {
         db.intern_macro(MacroCallLoc { def: self, krate, kind })
     }
+
+    pub fn ast_id(&self) -> Option<AstId<ast::Macro>> {
+        let id = match &self.kind {
+            MacroDefKind::Declarative(id) => id,
+            MacroDefKind::BuiltIn(_, id) => id,
+            MacroDefKind::BuiltInDerive(_, id) => id,
+            MacroDefKind::BuiltInEager(_, id) => id,
+            MacroDefKind::ProcMacro(..) => return None,
+        };
+        Some(*id)
+    }
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum MacroDefKind {
-    Declarative,
-    BuiltIn(BuiltinFnLikeExpander),
+    Declarative(AstId<ast::Macro>),
+    BuiltIn(BuiltinFnLikeExpander, AstId<ast::Macro>),
     // FIXME: maybe just Builtin and rename BuiltinFnLikeExpander to BuiltinExpander
-    BuiltInDerive(BuiltinDeriveExpander),
-    BuiltInEager(EagerExpander),
-    ProcMacro(ProcMacroExpander),
+    BuiltInDerive(BuiltinDeriveExpander, AstId<ast::Macro>),
+    BuiltInEager(EagerExpander, AstId<ast::Macro>),
+    ProcMacro(ProcMacroExpander, AstId<ast::Fn>),
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]