[runtime] Also migrate the Function and GeneratorFunction constructors to C++.

src/runtime/runtime-function.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/runtime/runtime-utils.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/deoptimizer.h"
@@ skipping 20 matching lines @@
 
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, name, 1);
 
   name = String::Flatten(name);
   f->shared()->set_name(*name);
   return isolate->heap()->undefined_value();
 }
 
 
-RUNTIME_FUNCTION(Runtime_CompleteFunctionConstruction) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 3);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, func, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, unchecked_new_target, 2);
-  func->shared()->set_name_should_print_as_anonymous(true);
-
-  if (unchecked_new_target->IsUndefined()) return *func;
-
-  Handle<JSReceiver> new_target =
-      Handle<JSReceiver>::cast(unchecked_new_target);
-  // If new.target is equal to |constructor| then the function |func| created
-  // is already correctly setup and nothing else should be done here.
-  // But if new.target is not equal to |constructor| then we are have a
-  // Function builtin subclassing case and therefore the function |func|
-  // has wrong initial map. To fix that we create a new function object with
-  // correct initial map.
-  if (*constructor == *new_target) return *func;
-
-  // Create a new JSFunction object with correct initial map.
-  HandleScope handle_scope(isolate);
-
-  DCHECK(constructor->has_initial_map());
-  Handle<Map> initial_map;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, initial_map,
-      JSFunction::GetDerivedMap(isolate, constructor, new_target));
-
-  Handle<SharedFunctionInfo> shared_info(func->shared(), isolate);
-  Handle<Map> map = Map::AsLanguageMode(
-      initial_map, shared_info->language_mode(), shared_info->kind());
-
-  Handle<Context> context(func->context(), isolate);
-  Handle<JSFunction> result =
-      isolate->factory()->NewFunctionFromSharedFunctionInfo(
-          map, shared_info, context, NOT_TENURED);
-  DCHECK_EQ(func->IsConstructor(), result->IsConstructor());
-  return *result;
-}
-
-
 RUNTIME_FUNCTION(Runtime_FunctionRemovePrototype) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
 
   CONVERT_ARG_CHECKED(JSFunction, f, 0);
   RUNTIME_ASSERT(f->RemovePrototype());
   f->shared()->set_construct_stub(
       *isolate->builtins()->ConstructedNonConstructable());
 
   return isolate->heap()->undefined_value();
@@ skipping 492 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_FunctionToString) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   return *JSFunction::ToString(function);
 }
 
 }  // namespace internal
 }  // namespace v8