Added macros OBJECT_IMPLEMENTATION and FINAL_OBJECT_IMPLEMENTATION

vm/exceptions.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/exceptions.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/flags.h"
@@ skipping 176 matching lines @@
   ASSERT(handler_pc != 0);
 
   // TODO(5411263): At some point we can optimize by figuring out if a
   // stack trace is needed based on whether the catch code specifies a
   // stack trace object or there is a rethrow in the catch clause.
   Stacktrace& stacktrace = Stacktrace::Handle();
   if (pc_offset_list.Length() != 0) {
     if (existing_stacktrace.IsNull()) {
       stacktrace = Stacktrace::New(func_list, code_list, pc_offset_list);
     } else {
-      stacktrace |= existing_stacktrace.raw();
+      stacktrace ^= existing_stacktrace.raw();
       stacktrace.Append(func_list, code_list, pc_offset_list);
     }
   } else {
-    stacktrace |= existing_stacktrace.raw();
+    stacktrace ^= existing_stacktrace.raw();
   }
   if (FLAG_print_stacktrace_at_throw) {
     OS::Print("Exception '%s' thrown:\n", exception.ToCString());
     OS::Print("%s\n", stacktrace.ToCString());
   }
   if (handler_exists) {
     // Found a dart handler for the exception, jump to it.
     JumpToExceptionHandler(handler_pc,
                            handler_sp,
                            handler_fp,
@@ skipping 252 matching lines @@
     case kIsolateUnhandledException:
       library = Library::IsolateLibrary();
       class_name = &Symbols::IsolateUnhandledException();
       break;
   }
 
   return DartLibraryCalls::ExceptionCreate(library, *class_name, arguments);
 }
 
 }  // namespace dart