--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/opto/live.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,74 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc.  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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class Block;
+class LRG_List;
+class PhaseCFG;
+class VectorSet;
+class IndexSet;
+
+//------------------------------PhaseLive--------------------------------------
+// Compute live-in/live-out
+class PhaseLive : public Phase {
+  // Array of Sets of values live at the start of a block.
+  // Indexed by block pre-order number.
+  IndexSet *_live;
+
+  // Array of Sets of values defined locally in the block
+  // Indexed by block pre-order number.
+  IndexSet *_defs;
+
+  // Array of delta-set pointers, indexed by block pre-order number
+  IndexSet **_deltas;
+  IndexSet *_free_IndexSet;     // Free list of same
+
+  Block_List *_worklist;        // Worklist for iterative solution
+
+  const PhaseCFG &_cfg;         // Basic blocks
+  LRG_List &_names;             // Mapping from Nodes to live ranges
+  uint _maxlrg;                 // Largest live-range number
+  Arena *_arena;
+
+  IndexSet *getset( Block *p );
+  IndexSet *getfreeset( );
+  void freeset( const Block *p );
+  void add_liveout( Block *p, uint r, VectorSet &first_pass );
+  void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass );
+
+public:
+  PhaseLive( const PhaseCFG &cfg, LRG_List &names, Arena *arena );
+  ~PhaseLive() {}
+  // Compute liveness info
+  void compute(uint maxlrg);
+  // Reset arena storage
+  void reset() { _live = NULL; }
+
+  // Return the live-out set for this block
+  IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; }
+
+#ifndef PRODUCT
+  void dump( const Block *b ) const;
+  void stats(uint iters) const;
+#endif
+};