Access a body's block def maps via a method

Author: jonas-schievink

crates/hir_def/src/body.rs

@@ -226,7 +226,7 @@ pub struct Body {
     /// The `ExprId` of the actual body expression.
     pub body_expr: ExprId,
     /// Block expressions in this body that may contain inner items.
-    pub block_scopes: Vec<BlockId>,
+    block_scopes: Vec<BlockId>,
     _c: Count<Self>,
 }
 
@@ -310,6 +310,16 @@ impl Body {
         db.body_with_source_map(def).0
     }
 
+    /// Returns an iterator over all block expressions in this body that define inner items.
+    pub fn blocks<'a>(
+        &'a self,
+        db: &'a dyn DefDatabase,
+    ) -> impl Iterator<Item = (BlockId, Arc<DefMap>)> + '_ {
+        self.block_scopes
+            .iter()
+            .filter_map(move |block| db.block_def_map(*block).map(|map| (*block, map)))
+    }
+
     fn new(
         db: &dyn DefDatabase,
         expander: Expander,

crates/hir_def/src/child_by_source.rs

@@ -160,7 +160,7 @@ impl ChildBySource for EnumId {
 impl ChildBySource for DefWithBodyId {
     fn child_by_source_to(&self, db: &dyn DefDatabase, res: &mut DynMap) {
         let body = db.body(*self);
-        for def_map in body.block_scopes.iter().filter_map(|block| db.block_def_map(*block)) {
+        for (_, def_map) in body.blocks(db) {
             // All block expressions are merged into the same map, because they logically all add
             // inner items to the containing `DefWithBodyId`.
             def_map[def_map.root()].scope.child_by_source_to(db, res);

crates/hir_ty/src/diagnostics/decl_check.rs

@@ -99,8 +99,7 @@ impl<'a, 'b> DeclValidator<'a, 'b> {
         let body = self.db.body(func.into());
 
         // Recursively validate inner scope items, such as static variables and constants.
-        let db = self.db;
-        for block_def_map in body.block_scopes.iter().filter_map(|block| db.block_def_map(*block)) {
+        for (_, block_def_map) in body.blocks(self.db.upcast()) {
             for (_, module) in block_def_map.modules() {
                 for def_id in module.scope.declarations() {
                     let mut validator = DeclValidator::new(self.db, self.krate, self.sink);

crates/hir_ty/src/tests.rs

@@ -288,7 +288,7 @@ fn visit_module(
     }
 
     fn visit_body(db: &TestDB, body: &Body, cb: &mut dyn FnMut(DefWithBodyId)) {
-        for def_map in body.block_scopes.iter().filter_map(|block| db.block_def_map(*block)) {
+        for (_, def_map) in body.blocks(db) {
             for (mod_id, _) in def_map.modules() {
                 visit_module(db, &def_map, mod_id, cb);
             }