Install the 'name' property in classes at runtime

src/factory.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/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2636 matching lines @@
         function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ? rw_attribs
                                                            : ro_attribs;
     Handle<AccessorInfo> prototype =
         Accessors::FunctionPrototypeInfo(isolate(), attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
                                  prototype, attribs);
     map->AppendDescriptor(&d);
   }
 }
 
+Handle<Map> Factory::CreateClassFunctionMap(Handle<JSFunction> empty_function) {
+  Handle<Map> map = NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
+  SetClassFunctionInstanceDescriptor(map);
+  map->set_is_constructor(true);
+  map->set_is_callable();
+  Map::SetPrototype(map, empty_function);
+  return map;
+}
+
+void Factory::SetClassFunctionInstanceDescriptor(Handle<Map> map) {
+  int size = 3;  // with prototype
+  Map::EnsureDescriptorSlack(map, size);
+
+  PropertyAttributes rw_attribs =
+      static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
+  PropertyAttributes roc_attribs =
+      static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
+
+  STATIC_ASSERT(JSFunction::kLengthDescriptorIndex == 0);
+  {  // Add length.
+    Handle<AccessorInfo> length =
+        Accessors::FunctionLengthInfo(isolate(), roc_attribs);
+    AccessorConstantDescriptor d(handle(Name::cast(length->name())), length,
+                                 roc_attribs);
+    map->AppendDescriptor(&d);
+  }
+
+  {
+    // Add prototype.
+    Handle<AccessorInfo> prototype =
+        Accessors::FunctionPrototypeInfo(isolate(), rw_attribs);
+    AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
+                                 prototype, rw_attribs);
+    map->AppendDescriptor(&d);
+  }
+}
+
 Handle<JSFixedArrayIterator> Factory::NewJSFixedArrayIterator(
     Handle<FixedArray> array) {
   // Create the "next" function (must be unique per iterator object).
   Handle<Code> code(
       isolate()->builtins()->builtin(Builtins::kFixedArrayIteratorNext));
   // TODO(neis): Don't create a new SharedFunctionInfo each time.
   Handle<JSFunction> next = isolate()->factory()->NewFunctionWithoutPrototype(
       isolate()->factory()->next_string(), code, false);
   next->shared()->set_native(true);
 
   // Create the iterator.
   Handle<Map> map(isolate()->native_context()->fixed_array_iterator_map());
   Handle<JSFixedArrayIterator> iterator =
       Handle<JSFixedArrayIterator>::cast(NewJSObjectFromMap(map));
   iterator->set_initial_next(*next);
   iterator->set_array(*array);
   iterator->set_index(0);
   iterator->InObjectPropertyAtPut(JSFixedArrayIterator::kNextIndex, *next);
   return iterator;
 }
 
 }  // namespace internal
 }  // namespace v8