ArraySplice builtin should return empty array and not alter receiver if invoked with no arguments.

src/builtins.cc

 // Copyright 2006-2008 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 735 matching lines @@
   } else if (!arg1->IsUndefined()) {
     return CallJsBuiltin("ArraySplice", args);
   }
   int actual_start = (relative_start < 0) ? Max(len + relative_start, 0)
                                           : Min(relative_start, len);
 
   // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is
   // given differently from when an undefined delete count is given.
   // This does not follow ECMA-262, but we do the same for
   // compatibility.
-  int delete_count = len;
-  if (n_arguments > 1) {
-    Object* arg2 = args[2];
-    if (arg2->IsSmi()) {
-      delete_count = Smi::cast(arg2)->value();
-    } else {
-      return CallJsBuiltin("ArraySplice", args);
+  int actual_delete_count;
+  if (n_arguments != 1) {
+    int value = 0;  // ToInteger(undefined) == 0
+    if (n_arguments > 1) {
+      Object* arg2 = args[2];
+      if (arg2->IsSmi()) {
+        value = Smi::cast(arg2)->value();
+      } else {
+        return CallJsBuiltin("ArraySplice", args);
+      }
     }
+    actual_delete_count = Min(Max(value, 0), len - actual_start);
+  } else {
+    ASSERT(len - actual_start >= 0);
+    actual_delete_count = len - actual_start;
   }
-  int actual_delete_count = Min(Max(delete_count, 0), len - actual_start);
 
   JSArray* result_array = NULL;
   if (actual_delete_count == 0) {
     Object* result;
     { MaybeObject* maybe_result = AllocateEmptyJSArray();
       if (!maybe_result->ToObject(&result)) return maybe_result;
     }
     result_array = JSArray::cast(result);
   } else {
     // Allocate result array.
@@ skipping 760 matching lines @@
       if (entry->contains(pc)) {
         return names_[i];
       }
     }
   }
   return NULL;
 }
 
 
 } }  // namespace v8::internal