Bug 1326453 - Part 1: Remove @@iterator method from module namespace objects per ES2017

js/src/builtin/Module.js

@@ -318,11 +318,3 @@ function ModuleEvaluation()
     return EvaluateModule(module);
 }
 _SetCanonicalName(ModuleEvaluation, "ModuleEvaluation");
-
-function ModuleNamespaceEnumerate()
-{
-    if (!IsObject(this) || !IsModuleNamespace(this))
-        return callFunction(CallModuleMethodIfWrapped, this, "ModuleNamespaceEnumerate");
-
-    return CreateListIterator(ModuleNamespaceExports(this));
-}

js/src/builtin/ModuleObject.cpp

@@ -289,14 +289,6 @@ ModuleNamespaceObject::create(JSContext* cx, HandleModuleObject module)
     if (!object)
         return nullptr;
 
-    RootedId funName(cx, INTERNED_STRING_TO_JSID(cx, cx->names().Symbol_iterator_fun));
-    RootedFunction enumerateFun(cx);
-    enumerateFun = JS::GetSelfHostedFunction(cx, "ModuleNamespaceEnumerate", funName, 0);
-    if (!enumerateFun)
-        return nullptr;
-
-    SetProxyExtra(object, ProxyHandler::EnumerateFunctionSlot, ObjectValue(*enumerateFun));
-
     return &object->as<ModuleNamespaceObject>();
 }
 
@@ -341,11 +333,6 @@ ModuleNamespaceObject::ProxyHandler::ProxyHandler()
   : BaseProxyHandler(&family, true)
 {}
 
-JS::Value ModuleNamespaceObject::ProxyHandler::getEnumerateFunction(HandleObject proxy) const
-{
-    return GetProxyExtra(proxy, EnumerateFunctionSlot);
-}
-
 bool
 ModuleNamespaceObject::ProxyHandler::getPrototype(JSContext* cx, HandleObject proxy,
                                                   MutableHandleObject protop) const
@@ -402,15 +389,6 @@ ModuleNamespaceObject::ProxyHandler::getOwnPropertyDescriptor(JSContext* cx, Han
     Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
     if (JSID_IS_SYMBOL(id)) {
         Rooted<JS::Symbol*> symbol(cx, JSID_TO_SYMBOL(id));
-        if (symbol == cx->wellKnownSymbols().iterator) {
-            RootedValue enumerateFun(cx, getEnumerateFunction(proxy));
-            desc.object().set(proxy);
-            desc.setConfigurable(false);
-            desc.setEnumerable(false);
-            desc.setValue(enumerateFun);
-            return true;
-        }
-
         if (symbol == cx->wellKnownSymbols().toStringTag) {
             RootedValue value(cx, StringValue(cx->names().Module));
             desc.object().set(proxy);
@@ -458,8 +436,7 @@ ModuleNamespaceObject::ProxyHandler::has(JSContext* cx, HandleObject proxy, Hand
     Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
     if (JSID_IS_SYMBOL(id)) {
         Rooted<JS::Symbol*> symbol(cx, JSID_TO_SYMBOL(id));
-        return symbol == cx->wellKnownSymbols().iterator ||
+        return symbol == cx->wellKnownSymbols().toStringTag;
-               symbol == cx->wellKnownSymbols().toStringTag;
     }
 
     *bp = ns->bindings().has(id);
@@ -473,11 +450,6 @@ ModuleNamespaceObject::ProxyHandler::get(JSContext* cx, HandleObject proxy, Hand
     Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
     if (JSID_IS_SYMBOL(id)) {
         Rooted<JS::Symbol*> symbol(cx, JSID_TO_SYMBOL(id));
-        if (symbol == cx->wellKnownSymbols().iterator) {
-            vp.set(getEnumerateFunction(proxy));
-            return true;
-        }
-
         if (symbol == cx->wellKnownSymbols().toStringTag) {
             vp.setString(cx->names().Module);
             return true;

js/src/builtin/ModuleObject.h

@@ -142,15 +142,8 @@ class ModuleNamespaceObject : public ProxyObject
   private:
     struct ProxyHandler : public BaseProxyHandler
     {
-        enum
-        {
-            EnumerateFunctionSlot = 0
-        };
-
         ProxyHandler();
 
-        JS::Value getEnumerateFunction(HandleObject proxy) const;
-
         bool getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
                                       MutableHandle<PropertyDescriptor> desc) const override;
         bool defineProperty(JSContext* cx, HandleObject proxy, HandleId id,

js/src/jit-test/tests/modules/import-namespace.js

@@ -64,25 +64,6 @@ assertEq(typeof desc.get, "undefined");
 assertEq(typeof desc.set, "undefined");
 assertEq(Object.prototype.toString.call(ns), "[object Module]");
 
-// Test @@iterator method.
-let iteratorFun = ns[Symbol.iterator];
-assertEq(iteratorFun.name, "[Symbol.iterator]");
-
-let iterator = ns[Symbol.iterator]();
-assertEq(iterator[Symbol.iterator](), iterator);
-assertIteratorNext(iterator, "a");
-assertIteratorNext(iterator, "b");
-assertIteratorDone(iterator);
-
-// The iterator's next method can only be called on the object it was originally
-// associated with.
-iterator = ns[Symbol.iterator]();
-let iterator2 = ns[Symbol.iterator]();
-assertThrowsInstanceOf(() => iterator.next.call({}), TypeError);
-assertThrowsInstanceOf(() => iterator.next.call(iterator2), TypeError);
-assertEq(iterator.next.call(iterator).value, "a");
-assertEq(iterator2.next.call(iterator2).value, "a");
-
 // Test cyclic namespace import and access in module evaluation.
 let c = moduleRepo['c'] =
     parseModule("export let c = 1; import * as ns from 'd'; let d = ns.d;");