Push version 2.1.2.6 to trunk. This add the IsExecutionTerminating...

src/api.cc

 // Copyright 2009 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 3541 matching lines @@
   }
 }
 
 
 void V8::TerminateExecution() {
   if (!i::V8::IsRunning()) return;
   i::StackGuard::TerminateExecution();
 }
 
 
+bool V8::IsExecutionTerminating() {
+  if (!i::V8::IsRunning()) return false;
+  if (i::Top::has_scheduled_exception()) {
+    return i::Top::scheduled_exception() == i::Heap::termination_exception();
+  }
+  return false;
+}
+
+
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj) {
   EnsureInitialized("v8::String::Utf8Value::Utf8Value()");
   if (obj.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
     return;
   }
   ENTER_V8;
   HandleScope scope;
   TryCatch try_catch;
@@ skipping 364 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