src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/code/VMRegImpl.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 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.

@@ -35,10 +35,11 @@
 
   private static VMReg stack0;
   private static int stack0Val;
   private static Address stack0Addr;
   private static AddressField regNameField;
+  private static int stackSlotSize;
 
   static {
     VM.registerVMInitializedObserver(new Observer() {
         public void update(Observable o, Object data) {
           initialize(VM.getVM().getTypeDataBase());

@@ -51,10 +52,11 @@
     AddressField stack0Field = type.getAddressField("stack0");
     stack0Addr = stack0Field.getValue();
     stack0Val = (int) stack0Addr.hashCode();
     stack0 = new VMReg(stack0Val);
     regNameField = type.getAddressField("regName[0]");
+    stackSlotSize = db.lookupIntConstant("VMRegImpl::stack_slot_size");
   }
 
   public static VMReg getStack0() {
     return stack0;
   }

@@ -65,6 +67,10 @@
     }
     Address regName = regNameField.getStaticFieldAddress();
     long addrSize = VM.getVM().getAddressSize();
     return CStringUtilities.getString(regName.getAddressAt(index * addrSize));
   }
+
+  public static int getStackSlotSize() {
+    return stackSlotSize;
+  }
 }