Reapply: "Make instanceof and Object.getPrototypeOf work for proxies,

src/runtime.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 576 matching lines @@
   }
   return isolate->heap()->CopyJSObject(JSObject::cast(*boilerplate));
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateJSProxy) {
   ASSERT(args.length() == 2);
   Object* handler = args[0];
   Object* prototype = args[1];
   Object* used_prototype =
-      (prototype->IsJSObject() || prototype->IsJSProxy()) ? prototype
-          : isolate->heap()->null_value();
+      prototype->IsJSReceiver() ? prototype : isolate->heap()->null_value();
   return isolate->heap()->AllocateJSProxy(handler, used_prototype);
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_IsJSProxy) {
+  ASSERT(args.length() == 1);
+  Object* obj = args[0];
+  return obj->IsJSProxy()
+      ? isolate->heap()->true_value() : isolate->heap()->false_value();
+}
+
+
+RUNTIME_FUNCTION(MaybeObject*, Runtime_GetHandler) {
+  ASSERT(args.length() == 1);
+  CONVERT_CHECKED(JSProxy, proxy, args[0]);
+  return proxy->handler();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateCatchExtensionObject) {
   ASSERT(args.length() == 2);
   CONVERT_CHECKED(String, key, args[0]);
   Object* value = args[1];
   ASSERT(!value->IsFailure());
   // Create a catch context extension object.
   JSFunction* constructor =
       isolate->context()->global_context()->
           context_extension_function();
   Object* object;
@@ skipping 14 matching lines @@
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_ClassOf) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
   Object* obj = args[0];
   if (!obj->IsJSObject()) return isolate->heap()->null_value();
   return JSObject::cast(obj)->class_name();
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_GetPrototype) {
+  NoHandleAllocation ha;
+  ASSERT(args.length() == 1);
+  Object* obj = args[0];
+  obj = obj->GetPrototype();
+  while (obj->IsJSObject() &&

[Kevin Millikin (Chromium), 2011/06/03 09:52:48]

Maybe clearer with do...while, if you like that sort of thing.

+         JSObject::cast(obj)->map()->is_hidden_prototype()) {
+    obj = obj->GetPrototype();
+  }
+  return obj;
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_IsInPrototypeChain) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
   // See ECMA-262, section 15.3.5.3, page 88 (steps 5 - 8).
   Object* O = args[0];
   Object* V = args[1];
   while (true) {
     Object* prototype = V->GetPrototype();
     if (prototype->IsNull()) return isolate->heap()->false_value();
     if (O == prototype) return isolate->heap()->true_value();
@@ skipping 11677 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal