ir: Fix definitions outside of base class manually tracking the correct parent.

Author: emilio

src/ir/context.rs

@@ -137,6 +137,14 @@ pub struct BindgenContext<'ctx> {
     /// Current module being traversed.
     current_module: ItemId,
 
+    /// A HashMap keyed on a type definition, and whose value is the parent id
+    /// of the declaration.
+    ///
+    /// This is used to handle the cases where the semantic and the lexical
+    /// parents of the cursor differ, like when a nested class is defined
+    /// outside of the parent class.
+    semantic_parents: HashMap<clang::Cursor, ItemId>,
+
     /// A stack with the current type declarations and types we're parsing. This
     /// is needed to avoid infinite recursion when parsing a type like:
     ///
@@ -375,6 +383,7 @@ impl<'ctx> BindgenContext<'ctx> {
             next_item_id: ItemId(1),
             root_module: root_module.id(),
             current_module: root_module.id(),
+            semantic_parents: Default::default(),
             currently_parsed_types: vec![],
             parsed_macros: Default::default(),
             replacements: Default::default(),
@@ -1187,6 +1196,31 @@ impl<'ctx> BindgenContext<'ctx> {
         self.current_module
     }
 
+    /// Add a semantic parent for a given type definition.
+    ///
+    /// We do this from the type declaration, in order to be able to find the
+    /// correct type definition afterwards.
+    ///
+    /// TODO(emilio): We could consider doing this only when
+    /// declaration.lexical_parent() != definition.lexical_parent(), but it's
+    /// not sure it's worth it.
+    pub fn add_semantic_parent(
+        &mut self,
+        definition: clang::Cursor,
+        parent_id: ItemId,
+    ) {
+        self.semantic_parents.insert(definition, parent_id);
+    }
+
+    /// Returns a known semantic parent for a given definition.
+    pub fn known_semantic_parent(
+        &self,
+        definition: clang::Cursor
+    ) -> Option<ItemId> {
+        self.semantic_parents.get(&definition).cloned()
+    }
+
+
     /// Given a cursor pointing to the location of a template instantiation,
     /// return a tuple of the form `(declaration_cursor, declaration_id,
     /// num_expected_template_args)`.

src/ir/item.rs

@@ -1197,19 +1197,28 @@ impl ClangItemParser for Item {
             let definition = cursor.definition();
             let applicable_cursor = definition.unwrap_or(cursor);
 
-            if definition.is_some() && definition != Some(cursor) {
-                return Ok(Item::from_ty_or_ref(
-                    applicable_cursor.cur_type(),
-                    cursor,
-                    parent_id,
-                    ctx,
-                ));
-            }
+
+            let relevant_parent_id = match definition {
+                Some(definition) => {
+                    if definition != cursor {
+                        ctx.add_semantic_parent(definition, relevant_parent_id);
+                        return Ok(Item::from_ty_or_ref(
+                            applicable_cursor.cur_type(),
+                            cursor,
+                            parent_id,
+                            ctx,
+                        ));
+                    }
+                    parent_id.or_else(|| ctx.known_semantic_parent(definition))
+                        .unwrap_or(ctx.current_module())
+                }
+                None => relevant_parent_id,
+            };
 
             match Item::from_ty(
                 &applicable_cursor.cur_type(),
                 applicable_cursor,
-                parent_id,
+                Some(relevant_parent_id),
                 ctx,
             ) {
                 Ok(ty) => return Ok(ty),

tests/expectations/tests/class_nested.rs

@@ -55,22 +55,22 @@ impl Clone for A {
 }
 #[repr(C)]
 #[derive(Debug, Default, Copy, Hash, PartialEq, Eq)]
-pub struct C {
+pub struct A_C {
     pub baz: ::std::os::raw::c_int,
 }
 #[test]
-fn bindgen_test_layout_C() {
-    assert_eq!(::std::mem::size_of::<C>() , 4usize , concat ! (
-               "Size of: " , stringify ! ( C ) ));
-    assert_eq! (::std::mem::align_of::<C>() , 4usize , concat ! (
-                "Alignment of " , stringify ! ( C ) ));
+fn bindgen_test_layout_A_C() {
+    assert_eq!(::std::mem::size_of::<A_C>() , 4usize , concat ! (
+               "Size of: " , stringify ! ( A_C ) ));
+    assert_eq! (::std::mem::align_of::<A_C>() , 4usize , concat ! (
+                "Alignment of " , stringify ! ( A_C ) ));
     assert_eq! (unsafe {
-                & ( * ( 0 as * const C ) ) . baz as * const _ as usize } ,
+                & ( * ( 0 as * const A_C ) ) . baz as * const _ as usize } ,
                 0usize , concat ! (
-                "Alignment of field: " , stringify ! ( C ) , "::" , stringify
-                ! ( baz ) ));
+                "Alignment of field: " , stringify ! ( A_C ) , "::" ,
+                stringify ! ( baz ) ));
 }
-impl Clone for C {
+impl Clone for A_C {
     fn clone(&self) -> Self { *self }
 }
 extern "C" {