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src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/VMReg.java

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -82,6 +82,10 @@
   public boolean lessThanOrEqual(VMReg arg)     { return value <= arg.value; }
   public boolean greaterThan(VMReg arg)         { return value > arg.value;  }
   public boolean greaterThanOrEqual(VMReg arg)  { return value >= arg.value; }
 
   public int     minus(VMReg arg)               { return value - arg.value;  }
+
+  public int reg2Stack() {
+    return value - VM.getVM().getVMRegImplInfo().getStack0().getValue();
+  }
 }
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