Implement set trap for proxies, and revamp class hierarchy in preparation

src/ic.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1337 matching lines @@
   if (!lookup->IsPropertyOrTransition() || !lookup->IsCacheable()) return false;
 
   // If the property is read-only, we leave the IC in its current
   // state.
   if (lookup->IsReadOnly()) return false;
 
   return true;
 }
 
 
-static bool LookupForWrite(JSObject* object,
+static bool LookupForWrite(JSReceiver* receiver,
                            String* name,
                            LookupResult* lookup) {
-  object->LocalLookup(name, lookup);
+  receiver->LocalLookup(name, lookup);
   if (!StoreICableLookup(lookup)) {
     return false;
   }
 
   if (lookup->type() == INTERCEPTOR) {
+    JSObject* object = JSObject::cast(receiver);
     if (object->GetNamedInterceptor()->setter()->IsUndefined()) {
       object->LocalLookupRealNamedProperty(name, lookup);
       return StoreICableLookup(lookup);
     }
   }
 
   return true;
 }
 
 
 MaybeObject* StoreIC::Store(State state,
                             StrictModeFlag strict_mode,
                             Handle<Object> object,
                             Handle<String> name,
                             Handle<Object> value) {
   // If the object is undefined or null it's illegal to try to set any
   // properties on it; throw a TypeError in that case.
   if (object->IsUndefined() || object->IsNull()) {
     return TypeError("non_object_property_store", object, name);
   }
 
-  if (!object->IsJSObject()) {
+  if (!object->IsJSReceiver()) {
     // The length property of string values is read-only. Throw in strict mode.
     if (strict_mode == kStrictMode && object->IsString() &&
         name->Equals(isolate()->heap()->length_symbol())) {
       return TypeError("strict_read_only_property", object, name);
     }
     // Ignore stores where the receiver is not a JSObject.
     return *value;
   }
 
+  // Handle proxies.
+  if (object->IsJSProxy()) {
+    return JSReceiver::cast(*object)->
+        SetProperty(*name, *value, NONE, strict_mode);
+  }
+
   Handle<JSObject> receiver = Handle<JSObject>::cast(object);
 
   // Check if the given name is an array index.
   uint32_t index;
   if (name->AsArrayIndex(&index)) {
     HandleScope scope(isolate());
     Handle<Object> result = SetElement(receiver, index, value, strict_mode);
     if (result.is_null()) return Failure::Exception();
     return *value;
   }
 
   // Use specialized code for setting the length of arrays.
   if (receiver->IsJSArray()
       && name->Equals(isolate()->heap()->length_symbol())
-      && receiver->AllowsSetElementsLength()) {
+      && JSArray::cast(*receiver)->AllowsSetElementsLength()) {
 #ifdef DEBUG
     if (FLAG_trace_ic) PrintF("[StoreIC : +#length /array]\n");
 #endif
     Builtins::Name target = (strict_mode == kStrictMode)
         ? Builtins::kStoreIC_ArrayLength_Strict
         : Builtins::kStoreIC_ArrayLength;
     set_target(isolate()->builtins()->builtin(target));
     return receiver->SetProperty(*name, *value, NONE, strict_mode);
   }
 
@@ skipping 1145 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal