src/hotspot/share/compiler/methodLiveness.hpp

*** 45,10 ***
--- 45,17 ---
      , _is_valid(false)
    {}
  
    void set_is_valid() { _is_valid = true; }
    bool is_valid() const { return _is_valid; }
+ 
+ #ifdef ASSERT
+   bool at(idx_t index) const {
+     assert(is_valid(), "reading invalid");
+     return ResourceBitMap::at(index);
+   }
+ #endif
  };
  
  class MethodLiveness : public ArenaObj {
   public:
    // The BasicBlock class is used to represent a basic block in the