--- old/src/share/vm/opto/block.hpp	Fri Sep  9 14:16:14 2011
+++ new/src/share/vm/opto/block.hpp	Fri Sep  9 14:16:14 2011
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -45,6 +45,7 @@
 // Note that the constructor just zeros things, and since I use Arena
 // allocation I do not need a destructor to reclaim storage.
 class Block_Array : public ResourceObj {
+  friend class VMStructs;
   uint _size;                   // allocated size, as opposed to formal limit
   debug_only(uint _limit;)      // limit to formal domain
 protected:
@@ -72,6 +73,7 @@
 
 
 class Block_List : public Block_Array {
+  friend class VMStructs;
 public:
   uint _cnt;
   Block_List() : Block_Array(Thread::current()->resource_area()), _cnt(0) {}
@@ -87,6 +89,7 @@
 
 
 class CFGElement : public ResourceObj {
+  friend class VMStructs;
  public:
   float _freq; // Execution frequency (estimate)
 
@@ -102,6 +105,7 @@
 // Basic blocks are used during the output routines, and are not used during
 // any optimization pass.  They are created late in the game.
 class Block : public CFGElement {
+  friend class VMStructs;
  public:
   // Nodes in this block, in order
   Node_List _nodes;
@@ -341,6 +345,7 @@
 //------------------------------PhaseCFG---------------------------------------
 // Build an array of Basic Block pointers, one per Node.
 class PhaseCFG : public Phase {
+  friend class VMStructs;
  private:
   // Build a proper looking cfg.  Return count of basic blocks
   uint build_cfg();
@@ -515,6 +520,7 @@
 
 //------------------------------CFGLoop-------------------------------------------
 class CFGLoop : public CFGElement {
+  friend class VMStructs;
   int _id;
   int _depth;
   CFGLoop *_parent;      // root of loop tree is the method level "pseudo" loop, it's parent is null
@@ -566,6 +572,7 @@
 // A edge between two basic blocks that will be embodied by a branch or a
 // fall-through.
 class CFGEdge : public ResourceObj {
+  friend class VMStructs;
  private:
   Block * _from;        // Source basic block
   Block * _to;          // Destination basic block
@@ -702,6 +709,7 @@
 //------------------------------PhaseBlockLayout-------------------------------
 // Rearrange blocks into some canonical order, based on edges and their frequencies
 class PhaseBlockLayout : public Phase {
+  friend class VMStructs;
   PhaseCFG &_cfg;               // Control flow graph
 
   GrowableArray<CFGEdge *> *edges;