[Proxies] Support constructable proxy as new.target (reland)

src/objects.cc

 // Copyright 2013 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 4676 matching lines @@
   if (isolate->has_pending_exception()) return Nothing<bool>();
   if (owned && !target_desc.configurable()) {
     isolate->Throw(*factory->NewTypeError(
         MessageTemplate::kProxyDeletePropertyViolatesInvariant, name));
     return Nothing<bool>();
   }
   return Just(true);
 }
 
 
+// static
+MaybeHandle<Context> JSProxy::GetFunctionRealm(Handle<JSProxy> proxy) {
+  DCHECK(proxy->map()->is_constructor());
+  if (JSProxy::IsRevoked(proxy)) {
+    THROW_NEW_ERROR(proxy->GetIsolate(),
+                    NewTypeError(MessageTemplate::kProxyRevoked), Context);
+  }
+
+  // TODO(verwaest): Get rid of JSFunctionProxies.
+  Object* target = proxy->IsJSFunctionProxy()
+                       ? JSFunctionProxy::cast(*proxy)->construct_trap()
+                       : proxy->target();
+  return JSReceiver::GetFunctionRealm(handle(JSReceiver::cast(target)));
+}
+
+
+// static
+MaybeHandle<Context> JSFunction::GetFunctionRealm(Handle<JSFunction> function) {
+  DCHECK(function->map()->is_constructor());
+  return handle(function->context()->native_context());
+}
+
+
+// static
+MaybeHandle<Context> JSObject::GetFunctionRealm(Handle<JSObject> object) {
+  DCHECK(object->map()->is_constructor());
+  DCHECK(!object->IsJSFunction());
+  return handle(object->GetCreationContext());
+}
+
+
+// static
+MaybeHandle<Context> JSReceiver::GetFunctionRealm(Handle<JSReceiver> receiver) {
+  if (receiver->IsJSProxy()) {
+    return JSProxy::GetFunctionRealm(Handle<JSProxy>::cast(receiver));
+  }
+
+  if (receiver->IsJSFunction()) {
+    return JSFunction::GetFunctionRealm(Handle<JSFunction>::cast(receiver));
+  }
+
+  return JSObject::GetFunctionRealm(Handle<JSObject>::cast(receiver));
+}
+
+
 Maybe<PropertyAttributes> JSProxy::GetPropertyAttributes(LookupIterator* it) {
   Isolate* isolate = it->isolate();
   HandleScope scope(isolate);
   PropertyDescriptor desc;
   bool found = JSProxy::GetOwnPropertyDescriptor(it, &desc);
   if (isolate->has_pending_exception()) return Nothing<PropertyAttributes>();
   if (!found) return Just(ABSENT);
   return Just(desc.ToAttributes());
 }
 
@@ skipping 7508 matching lines @@
       return handle(new_target->initial_map(), isolate);
     }
   }
 
   // First create a new map with the size and number of in-object properties
   // suggested by the function.
   DCHECK(!new_target->shared()->is_generator());
   DCHECK(!constructor->shared()->is_generator());
 
   // Fetch or allocate prototype.
+  // TODO(verwaest): In case of non-instance prototype, use the
+  // intrinsicDefaultProto instead.
   Handle<Object> prototype;
   if (new_target->has_instance_prototype()) {
     prototype = handle(new_target->instance_prototype(), isolate);
   } else {
     prototype = isolate->factory()->NewFunctionPrototype(new_target);
   }
 
   // Finally link initial map and constructor function if the original
   // constructor is actually a subclass constructor.
   if (IsSubclassConstructor(new_target->shared()->kind())) {
@@ skipping 6366 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8