6711316: Open source the Garbage-First garbage collector

First mercurial integration of the code for the Garbage-First garbage collector.

Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr

hotspot/src/share/vm/gc_implementation/g1/g1MarkSweep.hpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2001-2007 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 ReferenceProcessor;
+
+// G1MarkSweep takes care of global mark-compact garbage collection for a
+// G1CollectedHeap using a four-phase pointer forwarding algorithm.  All
+// generations are assumed to support marking; those that can also support
+// compaction.
+//
+// Class unloading will only occur when a full gc is invoked.
+
+
+class G1MarkSweep : AllStatic {
+  friend class VM_G1MarkSweep;
+  friend class Scavenge;
+
+ public:
+
+  static void invoke_at_safepoint(ReferenceProcessor* rp,
+                                  bool clear_all_softrefs);
+
+ private:
+
+  // Mark live objects
+  static void mark_sweep_phase1(bool& marked_for_deopt,
+                                bool clear_all_softrefs);
+  // Calculate new addresses
+  static void mark_sweep_phase2();
+  // Update pointers
+  static void mark_sweep_phase3();
+  // Move objects to new positions
+  static void mark_sweep_phase4();
+
+  static void allocate_stacks();
+};