Added dictionary that can use objects as keys.

src/handles.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 409 matching lines @@
   CALL_HEAP_FUNCTION(object->GetIsolate(), object->PreventExtensions(), Object);
 }
 
 
 Handle<Object> GetHiddenProperties(Handle<JSObject> obj,
                                    bool create_if_needed) {
   Isolate* isolate = obj->GetIsolate();
   Object* holder = obj->BypassGlobalProxy();
   if (holder->IsUndefined()) return isolate->factory()->undefined_value();
   obj = Handle<JSObject>(JSObject::cast(holder), isolate);
-
-  if (obj->HasFastProperties()) {
-    // If the object has fast properties, check whether the first slot
-    // in the descriptor array matches the hidden symbol. Since the
-    // hidden symbols hash code is zero (and no other string has hash
-    // code zero) it will always occupy the first entry if present.
-    DescriptorArray* descriptors = obj->map()->instance_descriptors();
-    if ((descriptors->number_of_descriptors() > 0) &&
-        (descriptors->GetKey(0) == isolate->heap()->hidden_symbol()) &&
-        descriptors->IsProperty(0)) {
-      ASSERT(descriptors->GetType(0) == FIELD);
-      return Handle<Object>(obj->FastPropertyAt(descriptors->GetFieldIndex(0)),
-                            isolate);
-    }
-  }
-
-  // Only attempt to find the hidden properties in the local object and not
-  // in the prototype chain.  Note that HasLocalProperty() can cause a GC in
-  // the general case in the presence of interceptors.
-  if (!obj->HasHiddenPropertiesObject()) {
-    // Hidden properties object not found. Allocate a new hidden properties
-    // object if requested. Otherwise return the undefined value.
-    if (create_if_needed) {
-      Handle<Object> hidden_obj =
-          isolate->factory()->NewJSObject(isolate->object_function());
-      CALL_HEAP_FUNCTION(isolate,
-                         obj->SetHiddenPropertiesObject(*hidden_obj), Object);
-    } else {
-      return isolate->factory()->undefined_value();
-    }
-  }
-  return Handle<Object>(obj->GetHiddenPropertiesObject(), isolate);
+  CALL_HEAP_FUNCTION(isolate,
+                     obj->GetHiddenProperties(create_if_needed),
+                     Object);
 }
 
 
+Handle<Smi> GetIdentityHash(Handle<JSObject> obj) {
+  CALL_HEAP_FUNCTION(obj->GetIsolate(), obj->GetIdentityHash(), Smi);
+}
+
+
 Handle<Object> DeleteElement(Handle<JSObject> obj,
                              uint32_t index) {
   CALL_HEAP_FUNCTION(obj->GetIsolate(),
                      obj->DeleteElement(index, JSObject::NORMAL_DELETION),
                      Object);
 }
 
 
 Handle<Object> DeleteProperty(Handle<JSObject> obj,
                               Handle<String> prop) {
@@ skipping 496 matching lines @@
 
 bool CompileOptimized(Handle<JSFunction> function,
                       int osr_ast_id,
                       ClearExceptionFlag flag) {
   CompilationInfo info(function);
   info.SetOptimizing(osr_ast_id);
   return CompileLazyHelper(&info, flag);
 }
 
 } }  // namespace v8::internal