Make it possible to create a v8::Function directly w/o a prototype

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 1168 matching lines @@
   }
   obj->set_length(length);
   obj->set_undetectable(false);
   obj->set_needs_access_check(false);
   obj->set_accept_any_receiver(true);
   if (!signature.IsEmpty())
     obj->set_signature(*Utils::OpenHandle(*signature));
   return Utils::ToLocal(obj);
 }
 
-
-Local<FunctionTemplate> FunctionTemplate::New(Isolate* isolate,
-                                              FunctionCallback callback,
-                                              v8::Local<Value> data,
-                                              v8::Local<Signature> signature,
-                                              int length) {
+Local<FunctionTemplate> FunctionTemplate::New(
+    Isolate* isolate, FunctionCallback callback, v8::Local<Value> data,
+    v8::Local<Signature> signature, int length, ConstructorBehavior behavior) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   // Changes to the environment cannot be captured in the snapshot. Expect no
   // function templates when the isolate is created for serialization.
   LOG_API(i_isolate, FunctionTemplate, New);
   ENTER_V8(i_isolate);
-  return FunctionTemplateNew(i_isolate, callback, nullptr, data, signature,
-                             length, false);
+  auto templ = FunctionTemplateNew(i_isolate, callback, nullptr, data,
+                                   signature, length, false);
+  if (behavior == ConstructorBehavior::kThrow) templ->RemovePrototype();
+  return templ;
 }
 
 MaybeLocal<FunctionTemplate> FunctionTemplate::FromSnapshot(Isolate* isolate,
                                                             size_t index) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   i::FixedArray* templates = i_isolate->heap()->serialized_templates();
   int int_index = static_cast<int>(index);
   if (int_index < templates->length()) {
     i::Object* info = templates->get(int_index);
     if (info->IsFunctionTemplateInfo()) {
@@ skipping 3278 matching lines @@
 }
 
 
 Local<v8::Value> Object::CallAsConstructor(int argc,
                                            v8::Local<v8::Value> argv[]) {
   auto context = ContextFromHeapObject(Utils::OpenHandle(this));
   Local<Value>* argv_cast = reinterpret_cast<Local<Value>*>(argv);
   RETURN_TO_LOCAL_UNCHECKED(CallAsConstructor(context, argc, argv_cast), Value);
 }
 
-
 MaybeLocal<Function> Function::New(Local<Context> context,
                                    FunctionCallback callback, Local<Value> data,
-                                   int length) {
+                                   int length, ConstructorBehavior behavior) {
   i::Isolate* isolate = Utils::OpenHandle(*context)->GetIsolate();
   LOG_API(isolate, Function, New);
   ENTER_V8(isolate);
-  return FunctionTemplateNew(isolate, callback, nullptr, data,
-                             Local<Signature>(), length, true)
-      ->GetFunction(context);
+  auto templ = FunctionTemplateNew(isolate, callback, nullptr, data,
+                                   Local<Signature>(), length, true);
+  if (behavior == ConstructorBehavior::kThrow) templ->RemovePrototype();
+  return templ->GetFunction(context);
 }
 
 
 Local<Function> Function::New(Isolate* v8_isolate, FunctionCallback callback,
                               Local<Value> data, int length) {
-  return Function::New(v8_isolate->GetCurrentContext(), callback, data, length)
+  return Function::New(v8_isolate->GetCurrentContext(), callback, data, length,
+                       ConstructorBehavior::kAllow)
       .FromMaybe(Local<Function>());
 }
 
 
 Local<v8::Object> Function::NewInstance() const {
   return NewInstance(Isolate::GetCurrent()->GetCurrentContext(), 0, NULL)
       .FromMaybe(Local<Object>());
 }
 
 
@@ skipping 4413 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8