Force mark sweep if size of map space is to big to allow forward pointers enc...

src/heap.h

 // 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
@@ skipping 870 matching lines @@
   static size_t code_range_size_;
 
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
   static int survived_since_last_expansion_;
 
   static int always_allocate_scope_depth_;
   static int linear_allocation_scope_depth_;
   static bool context_disposed_pending_;
 
-  // The number of MapSpace pages is limited by the way we pack
-  // Map pointers during GC.
-  static const int kMaxMapSpaceSize =
-      (1 << (MapWord::kMapPageIndexBits)) * Page::kPageSize;
-
 #if defined(V8_TARGET_ARCH_X64)
   static const int kMaxObjectSizeInNewSpace = 512*KB;
 #else
   static const int kMaxObjectSizeInNewSpace = 256*KB;
 #endif
 
   static NewSpace new_space_;
   static OldSpace* old_pointer_space_;
   static OldSpace* old_data_space_;
   static OldSpace* code_space_;
@@ skipping 770 matching lines @@
 
   // To speed up scavenge collections new space string are kept
   // separate from old space strings.
   static List<Object*> new_space_strings_;
   static List<Object*> old_space_strings_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_