1 files changed, 32 insertions, 27 deletions
diff --git a/components/script/dom/bindings/codegen/Configuration.py b/components/script/dom/bindings/codegen/Configuration.py
index 22efa56f6d7..8944070f09c 100644
--- a/components/script/dom/bindings/codegen/Configuration.py
+++ b/components/script/dom/bindings/codegen/Configuration.py
@@ -166,28 +166,37 @@ class Descriptor(DescriptorProvider):
         # If we're concrete, we need to crawl our ancestor interfaces and mark
         # them as having a concrete descendant.
         self.concrete = desc.get('concrete', True)
+
+        self.operations = {
+            'IndexedGetter': None,
+            'IndexedSetter': None,
+            'IndexedCreator': None,
+            'IndexedDeleter': None,
+            'NamedGetter': None,
+            'NamedSetter': None,
+            'NamedCreator': None,
+            'NamedDeleter': None,
+            'Stringifier': None,
+        }
+
+        def addOperation(operation, m):
+            if not self.operations[operation]:
+                self.operations[operation] = m
+
+        # Since stringifiers go on the prototype, we only need to worry
+        # about our own stringifier, not those of our ancestor interfaces.
+        for m in self.interface.members:
+            if m.isMethod() and m.isStringifier():
+                addOperation('Stringifier', m)
+
         if self.concrete:
             self.proxy = False
-            operations = {
-                'IndexedGetter': None,
-                'IndexedSetter': None,
-                'IndexedCreator': None,
-                'IndexedDeleter': None,
-                'NamedGetter': None,
-                'NamedSetter': None,
-                'NamedCreator': None,
-                'NamedDeleter': None,
-                'Stringifier': None
-            }
             iface = self.interface
             while iface:
                 for m in iface.members:
                     if not m.isMethod():
                         continue
 
-                    def addOperation(operation, m):
-                        if not operations[operation]:
-                            operations[operation] = m
                     def addIndexedOrNamedOperation(operation, m):
                         self.proxy = True
                         if m.isIndexed():
@@ -196,24 +205,20 @@ class Descriptor(DescriptorProvider):
                             assert m.isNamed()
                             operation = 'Named' + operation
                         addOperation(operation, m)
-                        
-                    if m.isStringifier():
-                        addOperation('Stringifier', m)
-                    else:
-                        if m.isGetter():
-                            addIndexedOrNamedOperation('Getter', m)
-                        if m.isSetter():
-                            addIndexedOrNamedOperation('Setter', m)
-                        if m.isCreator():
-                            addIndexedOrNamedOperation('Creator', m)
-                        if m.isDeleter():
-                            addIndexedOrNamedOperation('Deleter', m)
+
+                    if m.isGetter():
+                        addIndexedOrNamedOperation('Getter', m)
+                    if m.isSetter():
+                        addIndexedOrNamedOperation('Setter', m)
+                    if m.isCreator():
+                        addIndexedOrNamedOperation('Creator', m)
+                    if m.isDeleter():
+                        addIndexedOrNamedOperation('Deleter', m)
 
                 iface.setUserData('hasConcreteDescendant', True)
                 iface = iface.parent
 
             if self.proxy:
-                self.operations = operations
                 iface = self.interface
                 while iface:
                     iface.setUserData('hasProxyDescendant', True)