Replace hasInterfacePrototypeObject checks by isCallback checks in codegen.

Checking for callbacks directly makes it a lot clearer what's going on, and we
don't intend to take hasConcreteDescendant into consideration.

See also <https://bugzilla.mozilla.org/show_bug.cgi?id=1026720>.

src/components/script/dom/bindings/codegen/CodegenRust.py

@@ -1788,7 +1788,7 @@ JS_SetReservedSlot(obj, DOM_OBJECT_SLOT as u32,
 
 class CGWrapMethod(CGAbstractMethod):
     def __init__(self, descriptor):
-        assert descriptor.interface.hasInterfacePrototypeObject()
+        assert not descriptor.interface.isCallback()
         if not descriptor.createGlobal:
             args = [Argument('*mut JSContext', 'aCx'), Argument('&GlobalRef', 'aScope'),
                     Argument("Box<%s>" % descriptor.concreteType, 'aObject', mutable=True)]
@@ -1920,6 +1920,7 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
     properties should be a PropertyArrays instance.
     """
     def __init__(self, descriptor, properties):
+        assert not descriptor.interface.isCallback()
         args = [Argument('*mut JSContext', 'aCx'), Argument('*mut JSObject', 'aGlobal'),
                 Argument('*mut JSObject', 'aReceiver')]
         CGAbstractMethod.__init__(self, descriptor, 'CreateInterfaceObjects', '*mut JSObject', args)
@@ -1933,12 +1934,6 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
             getParentProto = ("%s::GetProtoObject(aCx, aGlobal, aReceiver)" %
                               toBindingNamespace(parentProtoName))
 
-        needInterfaceObject = self.descriptor.interface.hasInterfaceObject()
-        needInterfacePrototypeObject = self.descriptor.interface.hasInterfacePrototypeObject()
-
-        # if we don't need to create anything, why are we generating this?
-        assert needInterfaceObject or needInterfacePrototypeObject
-
         getParentProto = ("let parentProto: *mut JSObject = %s;\n"
                           "assert!(parentProto.is_not_null());\n") % getParentProto
 
@@ -1950,7 +1945,7 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
         else:
             domClass = "ptr::null()"
 
-        if needInterfaceObject:
+        if self.descriptor.interface.hasInterfaceObject():
             if self.descriptor.interface.ctor():
                 constructHook = CONSTRUCT_HOOK_NAME
                 constructArgs = methodLength(self.descriptor.interface.ctor())
@@ -4049,17 +4044,15 @@ class CGDescriptor(CGThing):
     def __init__(self, descriptor):
         CGThing.__init__(self)
 
-        assert not descriptor.concrete or descriptor.interface.hasInterfacePrototypeObject()
+        assert not descriptor.interface.isCallback()
 
         cgThings = []
-        if descriptor.interface.hasInterfacePrototypeObject():
         cgThings.append(CGGetProtoObjectMethod(descriptor))
         if descriptor.interface.hasInterfaceObject():
             # https://github.com/mozilla/servo/issues/2665
             # cgThings.append(CGGetConstructorObjectMethod(descriptor))
             pass
 
-        if descriptor.interface.hasInterfacePrototypeObject():
         (hasMethod, hasGetter, hasLenientGetter,
          hasSetter, hasLenientSetter) = False, False, False, False, False
         for m in descriptor.interface.members:
@@ -4067,7 +4060,7 @@ class CGDescriptor(CGThing):
                 if m.isStatic():
                     assert descriptor.interface.hasInterfaceObject()
                     cgThings.append(CGStaticMethod(descriptor, m))
-                    elif descriptor.interface.hasInterfacePrototypeObject():
+                else:
                     cgThings.append(CGSpecializedMethod(descriptor, m))
                     cgThings.append(CGMemberJITInfo(descriptor, m))
                     hasMethod = True
@@ -4075,7 +4068,7 @@ class CGDescriptor(CGThing):
                 if m.isStatic():
                     assert descriptor.interface.hasInterfaceObject()
                     cgThings.append(CGStaticGetter(descriptor, m))
-                    elif descriptor.interface.hasInterfacePrototypeObject():
+                else:
                     cgThings.append(CGSpecializedGetter(descriptor, m))
                     if m.hasLenientThis():
                         hasLenientGetter = True
@@ -4086,14 +4079,14 @@ class CGDescriptor(CGThing):
                     if m.isStatic():
                         assert descriptor.interface.hasInterfaceObject()
                         cgThings.append(CGStaticSetter(descriptor, m))
-                        elif descriptor.interface.hasInterfacePrototypeObject():
+                    else:
                         cgThings.append(CGSpecializedSetter(descriptor, m))
                         if m.hasLenientThis():
                             hasLenientSetter = True
                         else:
                             hasSetter = True
 
-                    if not m.isStatic() and descriptor.interface.hasInterfacePrototypeObject():
+                if not m.isStatic():
                     cgThings.append(CGMemberJITInfo(descriptor, m))
         if hasMethod:
             cgThings.append(CGGenericMethod(descriptor))
@@ -4114,7 +4107,6 @@ class CGDescriptor(CGThing):
             cgThings.append(CGClassConstructHook(descriptor))
             cgThings.append(CGInterfaceObjectJSClass(descriptor))
 
-        if descriptor.interface.hasInterfacePrototypeObject():
         cgThings.append(CGPrototypeJSClass(descriptor))
 
         properties = PropertyArrays(descriptor)
@@ -4415,7 +4407,7 @@ class CGBindingRoot(CGThing):
     """
     def __init__(self, config, prefix, webIDLFile):
         descriptors = config.getDescriptors(webIDLFile=webIDLFile,
-                                            hasInterfaceOrInterfacePrototypeObject=True)
+                                            isCallback=False)
         dictionaries = config.getDictionaries(webIDLFile=webIDLFile)
 
         cgthings = []
@@ -5383,7 +5375,7 @@ class GlobalGenRoots():
     @staticmethod
     def PrototypeList(config):
         # Prototype ID enum.
-        protos = [d.name for d in config.getDescriptors(hasInterfacePrototypeObject=True)]
+        protos = [d.name for d in config.getDescriptors(isCallback=False)]
         proxies = [d.name for d in config.getDescriptors(proxy=True)]
 
         return CGList([

src/components/script/dom/bindings/codegen/Configuration.py

@@ -72,10 +72,6 @@ class Configuration:
                 getter = lambda x: x.interface.filename()
             elif key == 'hasInterfaceObject':
                 getter = lambda x: x.interface.hasInterfaceObject()
-            elif key == 'hasInterfacePrototypeObject':
-                getter = lambda x: x.interface.hasInterfacePrototypeObject()
-            elif key == 'hasInterfaceOrInterfacePrototypeObject':
-                getter = lambda x: x.hasInterfaceOrInterfacePrototypeObject()
             elif key == 'isCallback':
                 getter = lambda x: x.interface.isCallback()
             elif key == 'isJSImplemented':
@@ -258,9 +254,6 @@ class Descriptor(DescriptorProvider):
         config.maxProtoChainLength = max(config.maxProtoChainLength,
                                          len(self.prototypeChain))
 
-    def hasInterfaceOrInterfacePrototypeObject(self):
-        return self.interface.hasInterfaceObject() or self.interface.hasInterfacePrototypeObject()
-
     def getExtendedAttributes(self, member, getter=False, setter=False):
         def maybeAppendInfallibleToAttrs(attrs, throws):
             if throws is None: