[strong] cache strong object literal maps

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/code-stubs.h"
@@ skipping 513 matching lines @@
     map->set_is_prototype_map(true);
     object_function_prototype->set_map(*map);
 
     native_context()->set_initial_object_prototype(*object_function_prototype);
     // For bootstrapping set the array prototype to be the same as the object
     // prototype, otherwise the missing initial_array_prototype will cause
     // assertions during startup.
     native_context()->set_initial_array_prototype(*object_function_prototype);
     Accessors::FunctionSetPrototype(object_fun, object_function_prototype)
         .Assert();
+
+    // Allocate initial strong object map.
+    Handle<Map> strong_object_map =
+        Map::Copy(object_function_map, "EmptyStrongObject");
+    strong_object_map->set_is_strong();
+    native_context()->set_js_object_strong_map(*strong_object_map);
   }
 
   // Allocate the empty function as the prototype for function - ES6 19.2.3
   Handle<Code> code(isolate->builtins()->builtin(Builtins::kEmptyFunction));
   Handle<JSFunction> empty_function =
       factory->NewFunctionWithoutPrototype(factory->empty_string(), code);
 
   // Allocate the function map first and then patch the prototype later
   Handle<Map> empty_function_map =
       CreateSloppyFunctionMap(FUNCTION_WITHOUT_PROTOTYPE);
@@ skipping 155 matching lines @@
 }
 
 
 Handle<Map> Genesis::CreateStrongFunctionMap(
     Handle<JSFunction> empty_function, bool is_constructor) {
   Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
   SetStrongFunctionInstanceDescriptor(map);
   map->set_function_with_prototype(is_constructor);
   Map::SetPrototype(map, empty_function);
   map->set_is_extensible(is_constructor);
-  map->set_is_strong(true);
+  map->set_is_strong();
   return map;
 }
 
 
 void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
   // Allocate map for the prototype-less strict mode instances.
   Handle<Map> strict_function_without_prototype_map =
       CreateStrictFunctionMap(FUNCTION_WITHOUT_PROTOTYPE, empty);
   native_context()->set_strict_function_without_prototype_map(
       *strict_function_without_prototype_map);
@@ skipping 293 matching lines @@
     native_context()->set_array_function(*array_function);
 
     // Cache the array maps, needed by ArrayConstructorStub
     CacheInitialJSArrayMaps(native_context(), initial_map);
     ArrayConstructorStub array_constructor_stub(isolate);
     Handle<Code> code = array_constructor_stub.GetCode();
     array_function->shared()->set_construct_stub(*code);
 
     Handle<Map> initial_strong_map =
         Map::Copy(initial_map, "SetInstancePrototype");
-    initial_strong_map->set_is_strong(true);
+    initial_strong_map->set_is_strong();
     CacheInitialJSArrayMaps(native_context(), initial_strong_map);
   }
 
   {  // --- N u m b e r ---
     Handle<JSFunction> number_fun =
         InstallFunction(global, "Number", JS_VALUE_TYPE, JSValue::kSize,
                         isolate->initial_object_prototype(),
                         Builtins::kIllegal);
     native_context()->set_number_function(*number_fun);
   }
@@ skipping 2011 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal