[strong] cache strong object literal maps

src/runtime/runtime-literals.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/arguments.h"
 #include "src/ast.h"
 #include "src/parser.h"
@@ skipping 30 matching lines @@
 MUST_USE_RESULT static MaybeHandle<Object> CreateObjectLiteralBoilerplate(
     Isolate* isolate, Handle<FixedArray> literals,
     Handle<FixedArray> constant_properties, bool should_have_fast_elements,
     bool has_function_literal, bool is_strong) {
   Handle<Context> context = isolate->native_context();
 
   // In case we have function literals, we want the object to be in
   // slow properties mode for now. We don't go in the map cache because
   // maps with constant functions can't be shared if the functions are
   // not the same (which is the common case).
-  // TODO(rossberg): handle strong objects with function literals
   bool is_result_from_cache = false;
   Handle<Map> map = has_function_literal
-                        ? Handle<Map>(context->object_function()->initial_map())
-                        : ComputeObjectLiteralMap(context, constant_properties,
-                                                  is_strong,
-                                                  &is_result_from_cache);
+      ? Handle<Map>(is_strong
+                        ? context->js_object_strong_map()
+                        : context->object_function()->initial_map())
+      : ComputeObjectLiteralMap(context, constant_properties, is_strong,
+                                &is_result_from_cache);
 
   PretenureFlag pretenure_flag =
       isolate->heap()->InNewSpace(*literals) ? NOT_TENURED : TENURED;
 
   Handle<JSObject> boilerplate =
       isolate->factory()->NewJSObjectFromMap(map, pretenure_flag);
 
   // Normalize the elements of the boilerplate to save space if needed.
   if (!should_have_fast_elements) JSObject::NormalizeElements(boilerplate);
 
@@ skipping 362 matching lines @@
         JSObject::TransitionElementsKind(boilerplate_object, transitioned_kind);
       }
     }
     FixedArray* object_array = FixedArray::cast(object->elements());
     object_array->set(store_index, *value);
   }
   return *object;
 }
 }  // namespace internal
 }  // namespace v8