Extend the maximum size map space...

src/mark-compact.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
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     }
   }
 }
 
 // -------------------------------------------------------------------------
 // Phase 2: Encode forwarding addresses.
 // When compacting, forwarding addresses for objects in old space and map
 // space are encoded in their map pointer word (along with an encoding of
 // their map pointers).
 //
-//  31             21 20              10 9               0
-// +-----------------+------------------+-----------------+
-// |forwarding offset|page offset of map|page index of map|
-// +-----------------+------------------+-----------------+
-//  11 bits           11 bits            10 bits
+// The excact encoding is described in the comments for class MapWord in
+// objects.h.
 //
 // An address range [start, end) can have both live and non-live objects.
 // Maximal non-live regions are marked so they can be skipped on subsequent
 // sweeps of the heap.  A distinguished map-pointer encoding is used to mark
 // free regions of one-word size (in which case the next word is the start
 // of a live object).  A second distinguished map-pointer encoding is used
 // to mark free regions larger than one word, and the size of the free
 // region (including the first word) is written to the second word of the
 // region.
 //
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 void MarkCompactCollector::RebuildRSets() {
 #ifdef DEBUG
   ASSERT(state_ == RELOCATE_OBJECTS);
   state_ = REBUILD_RSETS;
 #endif
   Heap::RebuildRSets();
 }
 
 } }  // namespace v8::internal