src/share/vm/runtime/frame.cpp

*** 223,232 ****
--- 223,245 ----
    }
  
    return NULL;
  }
  
+ bool frame::entry_frame_is_safe(JavaThread* thread) const {
+   // Validate the JavaCallWrapper an entry frame must have
+   address jcw = (address)entry_frame_call_wrapper();
+   bool jcw_safe = (jcw <= thread->stack_base()) && (jcw > (address)fp());
+   if (!jcw_safe) {
+     return false;
+   }
+ 
+   // Validate sp saved in the java frame anchor
+   JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
+   return (jfa->last_Java_sp() > sp());
+ }
+ 
  bool frame::should_be_deoptimized() const {
    if (_deopt_state == is_deoptimized ||
        !is_compiled_frame() ) return false;
    assert(_cb != NULL && _cb->is_compiled(), "must be an nmethod");
    CompiledMethod* nm = (CompiledMethod *)_cb;