src/share/vm/c1/c1_Instruction.hpp

@@ -105,10 +105,11 @@
 class         UnsafePrefetchRead;
 class         UnsafePrefetchWrite;
 class   ProfileCall;
 class   ProfileInvoke;
 class   RuntimeCall;
+class   MemBar;
 
 // A Value is a reference to the instruction creating the value
 typedef Instruction* Value;
 define_array(ValueArray, Value)
 define_stack(Values, ValueArray)

@@ -202,10 +203,11 @@
   virtual void do_UnsafePrefetchRead (UnsafePrefetchRead*  x) = 0;
   virtual void do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) = 0;
   virtual void do_ProfileCall    (ProfileCall*     x) = 0;
   virtual void do_ProfileInvoke  (ProfileInvoke*   x) = 0;
   virtual void do_RuntimeCall    (RuntimeCall*     x) = 0;
+  virtual void do_MemBar         (MemBar*          x) = 0;
 };
 
 
 // Hashing support
 //

@@ -2349,10 +2351,27 @@
   ValueStack* state()      { return _state; }
   virtual void input_values_do(ValueVisitor*)   {}
   virtual void state_values_do(ValueVisitor*);
 };
 
+LEAF(MemBar, Instruction)
+ private:
+  LIR_Code _code; 
+
+ public:
+  MemBar(LIR_Code code)
+    : Instruction(voidType)
+    , _code(code)
+  {
+    pin();
+  }
+
+  LIR_Code code()           { return _code; } 
+
+  virtual void input_values_do(ValueVisitor*)   {}
+};
+
 class BlockPair: public CompilationResourceObj {
  private:
   BlockBegin* _from;
   BlockBegin* _to;
  public: