Check the return value of API calls on ia32 and x64.

src/objects.cc

 // Copyright 2012 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 192 matching lines @@
     v8::Handle<v8::Value> result;
     {
       // Leaving JavaScript.
       VMState state(isolate, EXTERNAL);
       result = call_fun(v8::Utils::ToLocal(key), info);
     }
     RETURN_IF_SCHEDULED_EXCEPTION(isolate);
     if (result.IsEmpty()) {
       return isolate->heap()->undefined_value();
     }
-    return *v8::Utils::OpenHandle(*result);
+    Object* return_value = *v8::Utils::OpenHandle(*result);
+#if ENABLE_EXTRA_CHECKS
+    if (!(return_value->IsSmi() ||
+          return_value->IsString() ||
+          return_value->IsSpecObject() ||
+          return_value->IsHeapNumber() ||
+          return_value->IsUndefined() ||
+          return_value->IsTrue() ||
+          return_value->IsFalse() ||
+          return_value->IsNull())) {
+      FATAL("API call returned invalid object");
+    }
+#endif
+    return return_value;
   }
 
   // __defineGetter__ callback
   if (structure->IsAccessorPair()) {
     Object* getter = AccessorPair::cast(structure)->getter();
     if (getter->IsSpecFunction()) {
       // TODO(rossberg): nicer would be to cast to some JSCallable here...
       return GetPropertyWithDefinedGetter(receiver, JSReceiver::cast(getter));
     }
     // Getter is not a function.
@@ skipping 12978 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal