*** old/src/share/vm/c1/c1_Runtime1.cpp	Fri Oct 21 04:46:39 2011
--- new/src/share/vm/c1/c1_Runtime1.cpp	Fri Oct 21 04:46:39 2011

*** 679,688 ****
--- 679,705 ----
    } else {
      ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);
    }
  JRT_END
  
+ // Cf. OptoRuntime::deoptimize_caller_frame
+ JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread))
+   // Called from within the owner thread, so no need for safepoint
+   RegisterMap reg_map(thread, false);
+   frame stub_frame = thread->last_frame();
+   assert(stub_frame.is_runtime_frame(), "sanity check");
+   frame caller_frame = stub_frame.sender(&reg_map);
+ 
+   // We are coming from a compiled method; check this is true.
+   assert(CodeCache::find_nmethod(caller_frame.pc()) != NULL, "sanity");
+ 
+   // Deoptimize the caller frame.
+   Deoptimization::deoptimize_frame(thread, caller_frame.id());
+ 
+   // Return to the now deoptimized frame.
+ JRT_END
+ 
  
  static klassOop resolve_field_return_klass(methodHandle caller, int bci, TRAPS) {
    Bytecode_field field_access(caller, bci);
    // This can be static or non-static field access
    Bytecodes::Code code       = field_access.code();