--- a/src/share/vm/opto/reg_split.cpp	Mon Aug 05 15:03:40 2013 -0700
+++ b/src/share/vm/opto/reg_split.cpp	Wed Aug 07 17:56:19 2013 +0200
@@ -132,7 +132,7 @@
   }
 
   b->_nodes.insert(i,spill);    // Insert node in block
-  _cfg._bbs.map(spill->_idx,b); // Update node->block mapping to reflect
+  _cfg.map_node_to_block(spill,  b); // Update node->block mapping to reflect
   // Adjust the point where we go hi-pressure
   if( i <= b->_ihrp_index ) b->_ihrp_index++;
   if( i <= b->_fhrp_index ) b->_fhrp_index++;
@@ -219,7 +219,7 @@
         use->set_req(useidx, def);
       } else {
         // Block and index where the use occurs.
-        Block *b = _cfg._bbs[use->_idx];
+        Block *b = _cfg.get_block_for_node(use);
         // Put the clone just prior to use
         int bindex = b->find_node(use);
         // DEF is UP, so must copy it DOWN and hook in USE
@@ -270,7 +270,7 @@
   int bindex;
   // Phi input spill-copys belong at the end of the prior block
   if( use->is_Phi() ) {
-    b = _cfg._bbs[b->pred(useidx)->_idx];
+    b = _cfg.get_block_for_node(b->pred(useidx));
     bindex = b->end_idx();
   } else {
     // Put the clone just prior to use
@@ -335,7 +335,7 @@
         continue;
       }
 
-      Block *b_def = _cfg._bbs[def->_idx];
+      Block *b_def = _cfg.get_block_for_node(def);
       int idx_def = b_def->find_node(def);
       Node *in_spill = get_spillcopy_wide( in, def, i );
       if( !in_spill ) return 0; // Bailed out
@@ -589,7 +589,7 @@
         UPblock[slidx] = true;
         // Record following instruction in case 'n' rematerializes and
         // kills flags
-        Block *pred1 = _cfg._bbs[b->pred(1)->_idx];
+        Block *pred1 = _cfg.get_block_for_node(b->pred(1));
         continue;
       }
 
@@ -601,7 +601,7 @@
       // Grab predecessor block header
       n1 = b->pred(1);
       // Grab the appropriate reaching def info for inpidx
-      pred = _cfg._bbs[n1->_idx];
+      pred = _cfg.get_block_for_node(n1);
       pidx = pred->_pre_order;
       Node **Ltmp = Reaches[pidx];
       bool  *Utmp = UP[pidx];
@@ -616,7 +616,7 @@
         // Grab predecessor block headers
         n2 = b->pred(inpidx);
         // Grab the appropriate reaching def info for inpidx
-        pred = _cfg._bbs[n2->_idx];
+        pred = _cfg.get_block_for_node(n2);
         pidx = pred->_pre_order;
         Ltmp = Reaches[pidx];
         Utmp = UP[pidx];
@@ -701,7 +701,7 @@
         // Grab predecessor block header
         n1 = b->pred(1);
         // Grab the appropriate reaching def info for k
-        pred = _cfg._bbs[n1->_idx];
+        pred = _cfg.get_block_for_node(n1);
         pidx = pred->_pre_order;
         Node **Ltmp = Reaches[pidx];
         bool  *Utmp = UP[pidx];
@@ -919,7 +919,7 @@
                 return 0;
               }
               _lrg_map.extend(def->_idx, 0);
-              _cfg._bbs.map(def->_idx,b);
+              _cfg.map_node_to_block(def, b);
               n->set_req(inpidx, def);
               continue;
             }
@@ -1291,7 +1291,7 @@
   for( insidx = 0; insidx < phis->size(); insidx++ ) {
     Node *phi = phis->at(insidx);
     assert(phi->is_Phi(),"This list must only contain Phi Nodes");
-    Block *b = _cfg._bbs[phi->_idx];
+    Block *b = _cfg.get_block_for_node(phi);
     // Grab the live range number
     uint lidx = _lrg_map.find_id(phi);
     uint slidx = lrg2reach[lidx];
@@ -1315,7 +1315,7 @@
     // DEF has the wrong UP/DOWN value.
     for( uint i = 1; i < b->num_preds(); i++ ) {
       // Get predecessor block pre-order number
-      Block *pred = _cfg._bbs[b->pred(i)->_idx];
+      Block *pred = _cfg.get_block_for_node(b->pred(i));
       pidx = pred->_pre_order;
       // Grab reaching def
       Node *def = Reaches[pidx][slidx];