Bug 1370608 part 2 - Add JS_NewEnumerateStandardClasses and use it in js/src. r=evilpie

js/src/jsapi-tests/testFreshGlobalEvalRedefinition.cpp

@@ -7,12 +7,6 @@
 
 #include "jsapi-tests/tests.h"
 
-static bool
-GlobalEnumerate(JSContext* cx, JS::Handle<JSObject*> obj)
-{
-    return JS_EnumerateStandardClasses(cx, obj);
-}
-
 static bool
 GlobalResolve(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* resolvedp)
 {
@@ -23,7 +17,7 @@ BEGIN_TEST(testRedefineGlobalEval)
 {
     static const JSClassOps clsOps = {
         nullptr, nullptr, nullptr, nullptr,
-        GlobalEnumerate, nullptr, GlobalResolve, nullptr, nullptr,
+        nullptr, JS_NewEnumerateStandardClasses, GlobalResolve, nullptr, nullptr,
         nullptr, nullptr, nullptr,
         JS_GlobalObjectTraceHook
     };

js/src/jsapi.cpp

@@ -1117,6 +1117,63 @@ JS_EnumerateStandardClasses(JSContext* cx, HandleObject obj)
     return GlobalObject::initStandardClasses(cx, global);
 }
 
+static bool
+EnumerateUnresolvedStandardClasses(JSContext* cx, Handle<GlobalObject*> global,
+                                   AutoIdVector& properties, const JSStdName* table)
+{
+    for (unsigned i = 0; !table[i].isSentinel(); i++) {
+        if (table[i].isDummy())
+            continue;
+
+        JSProtoKey key = table[i].key;
+
+        // If the standard class has been resolved, the properties have been
+        // defined on the global so we don't need to add them here.
+        if (global->isStandardClassResolved(key))
+            continue;
+
+        if (GlobalObject::skipDeselectedConstructor(cx, key))
+            continue;
+
+        if (const Class* clasp = ProtoKeyToClass(key)) {
+            if (clasp->flags & JSCLASS_IS_ANONYMOUS)
+                continue;
+            if (!clasp->specShouldDefineConstructor())
+                continue;
+        }
+
+        jsid id = NameToId(AtomStateOffsetToName(cx->names(), table[i].atomOffset));
+        if (!properties.append(id))
+            return false;
+    }
+
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_NewEnumerateStandardClasses(JSContext* cx, JS::HandleObject obj, JS::AutoIdVector& properties,
+                               bool enumerableOnly)
+{
+    if (enumerableOnly) {
+        // There are no enumerable lazy properties.
+        return true;
+    }
+
+    Handle<GlobalObject*> global = obj.as<GlobalObject>();
+
+    // It's fine to always append |undefined| here, it's non-configurable and
+    // the enumeration code filters duplicates.
+    if (!properties.append(NameToId(cx->names().undefined)))
+        return false;
+
+    if (!EnumerateUnresolvedStandardClasses(cx, global, properties, standard_class_names))
+        return false;
+    if (!EnumerateUnresolvedStandardClasses(cx, global, properties, builtin_property_names))
+        return false;
+
+    return true;
+}
+
 JS_PUBLIC_API(bool)
 JS_GetClassObject(JSContext* cx, JSProtoKey key, MutableHandleObject objp)
 {

js/src/jsapi.h

@@ -1494,9 +1494,10 @@ JS_InitStandardClasses(JSContext* cx, JS::Handle<JSObject*> obj);
  * as usual for bool result-typed API entry points.
  *
  * This API can be called directly from a global object class's resolve op,
- * to define standard classes lazily.  The class's enumerate op should call
- * JS_EnumerateStandardClasses(cx, obj), to define eagerly during for..in
- * loops any classes not yet resolved lazily.
+ * to define standard classes lazily. The class should either have an enumerate
+ * hook that calls JS_EnumerateStandardClasses, or a newEnumerate hook that
+ * calls JS_NewEnumerateStandardClasses. newEnumerate is preferred because it's
+ * faster (does not define all standard classes).
  */
 extern JS_PUBLIC_API(bool)
 JS_ResolveStandardClass(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* resolved);
@@ -1507,6 +1508,10 @@ JS_MayResolveStandardClass(const JSAtomState& names, jsid id, JSObject* maybeObj
 extern JS_PUBLIC_API(bool)
 JS_EnumerateStandardClasses(JSContext* cx, JS::HandleObject obj);
 
+extern JS_PUBLIC_API(bool)
+JS_NewEnumerateStandardClasses(JSContext* cx, JS::HandleObject obj, JS::AutoIdVector& properties,
+                               bool enumerableOnly);
+
 extern JS_PUBLIC_API(bool)
 JS_GetClassObject(JSContext* cx, JSProtoKey key, JS::MutableHandle<JSObject*> objp);
 

js/src/jsobj.cpp

@@ -2769,10 +2769,24 @@ js::PreventExtensions(JSContext* cx, HandleObject obj, ObjectOpResult& result, I
 
     // Force lazy properties to be resolved.
     if (obj->isNative()) {
-        if (JSEnumerateOp enumerate = obj->getClass()->getEnumerate()) {
+        const Class* clasp = obj->getClass();
+        if (JSEnumerateOp enumerate = clasp->getEnumerate()) {
             if (!enumerate(cx, obj.as<NativeObject>()))
                 return false;
         }
+        if (clasp->getNewEnumerate() && clasp->getResolve()) {
+            AutoIdVector properties(cx);
+            if (!clasp->getNewEnumerate()(cx, obj, properties, /* enumerableOnly = */ false))
+                return false;
+
+            RootedId id(cx);
+            for (size_t i = 0; i < properties.length(); i++) {
+                id = properties[i];
+                bool found;
+                if (!HasOwnProperty(cx, obj, id, &found))
+                    return false;
+            }
+        }
     }
 
     // Sparsify dense elements, to make sure no element can be added without a

js/src/shell/js.cpp

@@ -3068,7 +3068,8 @@ typedef struct ComplexObject {
 } ComplexObject;
 
 static bool
-sandbox_enumerate(JSContext* cx, HandleObject obj)
+sandbox_enumerate(JSContext* cx, JS::HandleObject obj, JS::AutoIdVector& properties,
+                  bool enumerableOnly)
 {
     RootedValue v(cx);
 
@@ -3078,7 +3079,7 @@ sandbox_enumerate(JSContext* cx, HandleObject obj)
     if (!ToBoolean(v))
         return true;
 
-    return JS_EnumerateStandardClasses(cx, obj);
+    return JS_NewEnumerateStandardClasses(cx, obj, properties, enumerableOnly);
 }
 
 static bool
@@ -3095,7 +3096,7 @@ sandbox_resolve(JSContext* cx, HandleObject obj, HandleId id, bool* resolvedp)
 
 static const JSClassOps sandbox_classOps = {
     nullptr, nullptr, nullptr, nullptr,
-    sandbox_enumerate, nullptr, sandbox_resolve,
+    nullptr, sandbox_enumerate, sandbox_resolve,
     nullptr, nullptr,
     nullptr, nullptr, nullptr,
     JS_GlobalObjectTraceHook
@@ -7016,10 +7017,11 @@ js::shell::WarningReporter(JSContext* cx, JSErrorReport* report)
 }
 
 static bool
-global_enumerate(JSContext* cx, HandleObject obj)
+global_enumerate(JSContext* cx, JS::HandleObject obj, JS::AutoIdVector& properties,
+                 bool enumerableOnly)
 {
 #ifdef LAZY_STANDARD_CLASSES
-    return JS_EnumerateStandardClasses(cx, obj);
+    return JS_NewEnumerateStandardClasses(cx, obj, properties, enumerableOnly);
 #else
     return true;
 #endif
@@ -7043,7 +7045,7 @@ global_mayResolve(const JSAtomState& names, jsid id, JSObject* maybeObj)
 
 static const JSClassOps global_classOps = {
     nullptr, nullptr, nullptr, nullptr,
-    global_enumerate, nullptr, global_resolve, global_mayResolve,
+    nullptr, global_enumerate, global_resolve, global_mayResolve,
     nullptr,
     nullptr, nullptr, nullptr,
     JS_GlobalObjectTraceHook