Remove the global Strength enum class completely.

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/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
@@ skipping 139 matching lines @@
   // Creates some basic objects. Used for creating a context from scratch.
   void CreateRoots();
   // Creates the empty function.  Used for creating a context from scratch.
   Handle<JSFunction> CreateEmptyFunction(Isolate* isolate);
   // Creates the ThrowTypeError function. ECMA 5th Ed. 13.2.3
   Handle<JSFunction> GetRestrictedFunctionPropertiesThrower();
   Handle<JSFunction> GetStrictArgumentsPoisonFunction();
   Handle<JSFunction> GetThrowTypeErrorIntrinsic(Builtins::Name builtin_name);
 
   void CreateStrictModeFunctionMaps(Handle<JSFunction> empty);
-  void CreateStrongModeFunctionMaps(Handle<JSFunction> empty);
   void CreateIteratorMaps();
 
   // Make the "arguments" and "caller" properties throw a TypeError on access.
   void AddRestrictedFunctionProperties(Handle<Map> map);
 
   // Creates the global objects using the global proxy and the template passed
   // in through the API.  We call this regardless of whether we are building a
   // context from scratch or using a deserialized one from the partial snapshot
   // but in the latter case we don't use the objects it produces directly, as
   // we have to used the deserialized ones that are linked together with the
@@ skipping 106 matching lines @@
   }
 
   Handle<Map> CreateSloppyFunctionMap(FunctionMode function_mode);
 
   void SetFunctionInstanceDescriptor(Handle<Map> map,
                                      FunctionMode function_mode);
   void MakeFunctionInstancePrototypeWritable();
 
   Handle<Map> CreateStrictFunctionMap(FunctionMode function_mode,
                                       Handle<JSFunction> empty_function);
-  Handle<Map> CreateStrongFunctionMap(Handle<JSFunction> empty_function,
-                                      bool is_constructor);
 
 
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
   void SetStrongFunctionInstanceDescriptor(Handle<Map> map);
 
   static bool CallUtilsFunction(Isolate* isolate, const char* name);
 
   static bool CompileExtension(Isolate* isolate, v8::Extension* extension);
 
@@ skipping 241 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(Handle<Map>(object_fun->initial_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()->EmptyFunction());
   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 149 matching lines @@
     FunctionMode function_mode, Handle<JSFunction> empty_function) {
   Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
   SetStrictFunctionInstanceDescriptor(map, function_mode);
   map->set_is_constructor(IsFunctionModeWithPrototype(function_mode));
   map->set_is_callable();
   Map::SetPrototype(map, empty_function);
   return map;
 }
 
 
-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_is_constructor(is_constructor);
-  Map::SetPrototype(map, empty_function);
-  map->set_is_callable();
-  map->set_is_extensible(is_constructor);
-  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);
 
   // Allocate map for the strict mode functions. This map is temporary, used
   // only for processing of builtins.
   // Later the map is replaced with writable prototype map, allocated below.
   Handle<Map> strict_function_map =
       CreateStrictFunctionMap(FUNCTION_WITH_READONLY_PROTOTYPE, empty);
   native_context()->set_strict_function_map(*strict_function_map);
 
   // The final map for the strict mode functions. Writeable prototype.
   // This map is installed in MakeFunctionInstancePrototypeWritable.
   strict_function_map_writable_prototype_ =
       CreateStrictFunctionMap(FUNCTION_WITH_WRITEABLE_PROTOTYPE, empty);
 }
 
 
-void Genesis::CreateStrongModeFunctionMaps(Handle<JSFunction> empty) {
-  // Allocate map for strong mode instances, which never have prototypes.
-  Handle<Map> strong_function_map = CreateStrongFunctionMap(empty, false);
-  native_context()->set_strong_function_map(*strong_function_map);
-  // Constructors do, though.
-  Handle<Map> strong_constructor_map = CreateStrongFunctionMap(empty, true);
-  native_context()->set_strong_constructor_map(*strong_constructor_map);
-}
-
-
 void Genesis::CreateIteratorMaps() {
   // Create iterator-related meta-objects.
   Handle<JSObject> iterator_prototype =
       factory()->NewJSObject(isolate()->object_function(), TENURED);
   Handle<JSObject> generator_object_prototype =
       factory()->NewJSObject(isolate()->object_function(), TENURED);
   Handle<JSObject> generator_function_prototype =
       factory()->NewJSObject(isolate()->object_function(), TENURED);
   SetObjectPrototype(generator_object_prototype, iterator_prototype);
 
@@ skipping 17 matching lines @@
       *sloppy_generator_function_map);
 
   Handle<Map> strict_generator_function_map =
       Map::Copy(strict_function_map, "StrictGeneratorFunction");
   strict_generator_function_map->set_is_constructor(false);
   Map::SetPrototype(strict_generator_function_map,
                     generator_function_prototype);
   native_context()->set_strict_generator_function_map(
       *strict_generator_function_map);
 
-  Handle<Map> strong_function_map(native_context()->strong_function_map());
-  Handle<Map> strong_generator_function_map =
-      Map::Copy(strong_function_map, "StrongGeneratorFunction");
-  strong_generator_function_map->set_is_constructor(false);
-  Map::SetPrototype(strong_generator_function_map,
-                    generator_function_prototype);
-  native_context()->set_strong_generator_function_map(
-      *strong_generator_function_map);
-
   Handle<JSFunction> object_function(native_context()->object_function());
   Handle<Map> generator_object_prototype_map = Map::Create(isolate(), 0);
   Map::SetPrototype(generator_object_prototype_map, generator_object_prototype);
   native_context()->set_generator_object_prototype_map(
       *generator_object_prototype_map);
 }
 
 
 static void ReplaceAccessors(Handle<Map> map,
                              Handle<String> name,
@@ skipping 342 matching lines @@
 
     // Install in the native context
     native_context()->set_ordinary_has_instance(*has_instance);
 
     // Install the "constructor" property on the %FunctionPrototype%.
     JSObject::AddProperty(prototype, factory->constructor_string(),
                           function_fun, DONT_ENUM);
 
     sloppy_function_map_writable_prototype_->SetConstructor(*function_fun);
     strict_function_map_writable_prototype_->SetConstructor(*function_fun);
-    native_context()->strong_function_map()->SetConstructor(*function_fun);
   }
 
   {  // --- A r r a y ---
     Handle<JSFunction> array_function =
         InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize,
                         isolate->initial_object_prototype(),
                         Builtins::kArrayCode);
     array_function->shared()->DontAdaptArguments();
     array_function->shared()->set_builtin_function_id(kArrayCode);
 
@@ skipping 22 matching lines @@
 
     InstallWithIntrinsicDefaultProto(isolate, array_function,
                                      Context::ARRAY_FUNCTION_INDEX);
 
     // 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();
-    CacheInitialJSArrayMaps(native_context(), initial_strong_map);
-
     Handle<JSFunction> is_arraylike = SimpleInstallFunction(
         array_function, isolate->factory()->InternalizeUtf8String("isArray"),
         Builtins::kArrayIsArray, 1, true);
     native_context()->set_is_arraylike(*is_arraylike);
   }
 
   {  // --- N u m b e r ---
     Handle<JSFunction> number_fun = InstallFunction(
         global, "Number", JS_VALUE_TYPE, JSValue::kSize,
         isolate->initial_object_prototype(), Builtins::kNumberConstructor);
@@ skipping 895 matching lines @@
         *isolate->builtins()->GeneratorFunctionConstructor());
     generator_function_function->shared()->set_length(1);
     InstallWithIntrinsicDefaultProto(
         isolate, generator_function_function,
         Context::GENERATOR_FUNCTION_FUNCTION_INDEX);
 
     native_context->sloppy_generator_function_map()->SetConstructor(
         *generator_function_function);
     native_context->strict_generator_function_map()->SetConstructor(
         *generator_function_function);
-    native_context->strong_generator_function_map()->SetConstructor(
-        *generator_function_function);
   }
 
   {  // -- S e t I t e r a t o r
     Handle<JSObject> set_iterator_prototype =
         isolate->factory()->NewJSObject(isolate->object_function(), TENURED);
     SetObjectPrototype(set_iterator_prototype, iterator_prototype);
     Handle<JSFunction> set_iterator_function = InstallFunction(
         container, "SetIterator", JS_SET_ITERATOR_TYPE, JSSetIterator::kSize,
         set_iterator_prototype, Builtins::kIllegal);
     native_context->set_set_iterator_map(set_iterator_function->initial_map());
@@ skipping 1444 matching lines @@
 
     HookUpGlobalProxy(global_object, global_proxy);
     HookUpGlobalObject(global_object);
 
     if (!ConfigureGlobalObjects(global_proxy_template)) return;
   } else {
     // We get here if there was no context snapshot.
     CreateRoots();
     Handle<JSFunction> empty_function = CreateEmptyFunction(isolate);
     CreateStrictModeFunctionMaps(empty_function);
-    CreateStrongModeFunctionMaps(empty_function);
     CreateIteratorMaps();
     Handle<JSGlobalObject> global_object =
         CreateNewGlobals(global_proxy_template, global_proxy);
     HookUpGlobalProxy(global_object, global_proxy);
     InitializeGlobal(global_object, empty_function, context_type);
     InitializeNormalizedMapCaches();
 
     if (!InstallNatives(context_type)) return;
 
     MakeFunctionInstancePrototypeWritable();
@@ skipping 63 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8