[runtime] support new Proxy() instead of Proxy.create and install getPrototypeOf trap

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1176 matching lines @@
 MaybeHandle<Object> Object::SetElement(Isolate* isolate, Handle<Object> object,
                                        uint32_t index, Handle<Object> value,
                                        LanguageMode language_mode) {
   LookupIterator it(isolate, object, index);
   MAYBE_RETURN_NULL(
       SetProperty(&it, value, language_mode, MAY_BE_STORE_FROM_KEYED));
   return value;
 }
 
 
-Handle<Object> Object::GetPrototype(Isolate* isolate, Handle<Object> obj) {
+MaybeHandle<Object> Object::GetPrototype(Isolate* isolate,
+                                         Handle<Object> receiver) {
   // We don't expect access checks to be needed on JSProxy objects.
-  DCHECK(!obj->IsAccessCheckNeeded() || obj->IsJSObject());
+  DCHECK(!receiver->IsAccessCheckNeeded() || receiver->IsJSObject());
   Handle<Context> context(isolate->context());
-  if (obj->IsAccessCheckNeeded() &&
-      !isolate->MayAccess(context, Handle<JSObject>::cast(obj))) {
+  if (receiver->IsAccessCheckNeeded() &&
+      !isolate->MayAccess(context, Handle<JSObject>::cast(receiver))) {
     return isolate->factory()->null_value();
   }
-
-  PrototypeIterator iter(isolate, obj, PrototypeIterator::START_AT_RECEIVER);
+  if (receiver->IsJSProxy()) {
+    return JSProxy::GetPrototype(Handle<JSProxy>::cast(receiver));
+  }
+  PrototypeIterator iter(isolate, receiver,
+                         PrototypeIterator::START_AT_RECEIVER);
   do {
     iter.AdvanceIgnoringProxies();
     if (PrototypeIterator::GetCurrent(iter)->IsJSProxy()) {
       return PrototypeIterator::GetCurrent(iter);
     }
   } while (!iter.IsAtEnd(PrototypeIterator::END_AT_NON_HIDDEN));
   return PrototypeIterator::GetCurrent(iter);
 }
 
 
@@ skipping 5180 matching lines @@
 
 
 int JSFunction::NumberOfLiterals() {
   DCHECK(!shared()->bound());
   return literals()->length();
 }
 
 
 ACCESSORS(JSProxy, handler, Object, kHandlerOffset)
 ACCESSORS(JSProxy, hash, Object, kHashOffset)
+Object* JSProxy::target() const { return map()->prototype(); }

[Jakob Kummerow, 2015/11/12 12:04:24]

As discussed, we probably prefer an explicit |target| field with a regular
accessor to it (see Georg's CL). This doesn't need to block this CL; I'm fine
with landing as-is and adding a comment about our future intentions.

[Camillo Bruni, 2015/11/12 20:20:55]

added todo.

+void JSProxy::set_target(Object* value, WriteBarrierMode mode) {
+  map()->set_prototype(value, mode);
+}
+
 ACCESSORS(JSFunctionProxy, call_trap, JSReceiver, kCallTrapOffset)
 ACCESSORS(JSFunctionProxy, construct_trap, Object, kConstructTrapOffset)
 
 
 void JSProxy::InitializeBody(int object_size, Object* value) {
   DCHECK(!value->IsHeapObject() || !GetHeap()->InNewSpace(value));
   for (int offset = kHeaderSize; offset < object_size; offset += kPointerSize) {
     WRITE_FIELD(this, offset, value);
   }
 }
@@ skipping 1672 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_