Make Failure inherit from MaybeObject instead of Object.

src/api.cc

 // Copyright 2010 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 1489 matching lines @@
   return scope.Close(Utils::StackTraceToLocal(stackTrace));
 }
 
 
 static i::Handle<i::Object> CallV8HeapFunction(const char* name,
                                                i::Handle<i::Object> recv,
                                                int argc,
                                                i::Object** argv[],
                                                bool* has_pending_exception) {
   i::Handle<i::String> fmt_str = i::Factory::LookupAsciiSymbol(name);
-  i::Object* object_fun = i::Top::builtins()->GetProperty(*fmt_str);
+  i::Object* object_fun =
+      i::Top::builtins()->GetPropertyNoExceptionThrown(*fmt_str);
   i::Handle<i::JSFunction> fun =
       i::Handle<i::JSFunction>(i::JSFunction::cast(object_fun));
   i::Handle<i::Object> value =
       i::Execution::Call(fun, recv, argc, argv, has_pending_exception);
   return value;
 }
 
 
 static i::Handle<i::Object> CallV8HeapFunction(const char* name,
                                                i::Handle<i::Object> data,
@@ skipping 95 matching lines @@
 }
 
 
 // --- S t a c k T r a c e ---
 
 Local<StackFrame> StackTrace::GetFrame(uint32_t index) const {
   if (IsDeadCheck("v8::StackTrace::GetFrame()")) return Local<StackFrame>();
   ENTER_V8;
   HandleScope scope;
   i::Handle<i::JSArray> self = Utils::OpenHandle(this);
-  i::Handle<i::JSObject> obj(i::JSObject::cast(self->GetElement(index)));
+  i::Object* raw_object = self->GetElementNoExceptionThrown(index);
+  i::Handle<i::JSObject> obj(i::JSObject::cast(raw_object));
   return scope.Close(Utils::StackFrameToLocal(obj));
 }
 
 
 int StackTrace::GetFrameCount() const {
   if (IsDeadCheck("v8::StackTrace::GetFrameCount()")) return -1;
   ENTER_V8;
   return i::Smi::cast(Utils::OpenHandle(this)->length())->value();
 }
 
@@ skipping 895 matching lines @@
       Handle<String> key) {
   ON_BAILOUT("v8::Object::GetRealNamedPropertyInPrototypeChain()",
              return Local<Value>());
   ENTER_V8;
   i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   i::LookupResult lookup;
   self_obj->LookupRealNamedPropertyInPrototypes(*key_obj, &lookup);
   if (lookup.IsProperty()) {
     PropertyAttributes attributes;
-    i::Handle<i::Object> result(self_obj->GetProperty(*self_obj,
-                                                      &lookup,
-                                                      *key_obj,
-                                                      &attributes));
+    i::Object* property =
+        self_obj->GetProperty(*self_obj,
+                              &lookup,
+                              *key_obj,
+                              &attributes)->ToObjectUnchecked();
+    i::Handle<i::Object> result(property);
     return Utils::ToLocal(result);
   }
   return Local<Value>();  // No real property was found in prototype chain.
 }
 
 
 Local<Value> v8::Object::GetRealNamedProperty(Handle<String> key) {
   ON_BAILOUT("v8::Object::GetRealNamedProperty()", return Local<Value>());
   ENTER_V8;
   i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   i::LookupResult lookup;
   self_obj->LookupRealNamedProperty(*key_obj, &lookup);
   if (lookup.IsProperty()) {
     PropertyAttributes attributes;
-    i::Handle<i::Object> result(self_obj->GetProperty(*self_obj,
-                                                      &lookup,
-                                                      *key_obj,
-                                                      &attributes));
+    i::Object* property =
+        self_obj->GetProperty(*self_obj,
+                              &lookup,
+                              *key_obj,
+                              &attributes)->ToObjectUnchecked();
+    i::Handle<i::Object> result(property);
     return Utils::ToLocal(result);
   }
   return Local<Value>();  // No real property was found in prototype chain.
 }
 
 
 // Turns on access checks by copying the map and setting the check flag.
 // Because the object gets a new map, existing inline cache caching
 // the old map of this object will fail.
 void v8::Object::TurnOnAccessCheck() {
@@ skipping 2412 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal