Extend the maximum size map space...

src/objects-inl.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 934 matching lines @@
   value_ &= ~kOverflowMask;
 }
 
 
 MapWord MapWord::EncodeAddress(Address map_address, int offset) {
   // Offset is the distance in live bytes from the first live object in the
   // same page. The offset between two objects in the same page should not
   // exceed the object area size of a page.
   ASSERT(0 <= offset && offset < Page::kObjectAreaSize);
 
-  int compact_offset = offset >> kObjectAlignmentBits;
+  uintptr_t compact_offset = offset >> kObjectAlignmentBits;
   ASSERT(compact_offset < (1 << kForwardingOffsetBits));
 
   Page* map_page = Page::FromAddress(map_address);
   ASSERT_MAP_PAGE_INDEX(map_page->mc_page_index);
 
-  int map_page_offset =
-      map_page->Offset(map_address) >> kObjectAlignmentBits;
+  uintptr_t map_page_offset =
+      map_page->Offset(map_address) >> kMapAlignmentBits;
 
   uintptr_t encoding =
       (compact_offset << kForwardingOffsetShift) |
       (map_page_offset << kMapPageOffsetShift) |
       (map_page->mc_page_index << kMapPageIndexShift);
   return MapWord(encoding);
 }
 
 
 Address MapWord::DecodeMapAddress(MapSpace* map_space) {
   int map_page_index =
       static_cast<int>((value_ & kMapPageIndexMask) >> kMapPageIndexShift);
   ASSERT_MAP_PAGE_INDEX(map_page_index);
 
   int map_page_offset = static_cast<int>(
-      ((value_ & kMapPageOffsetMask) >> kMapPageOffsetShift)
-      << kObjectAlignmentBits);
+      ((value_ & kMapPageOffsetMask) >> kMapPageOffsetShift) <<
+      kMapAlignmentBits);
 
   return (map_space->PageAddress(map_page_index) + map_page_offset);
 }
 
 
 int MapWord::DecodeOffset() {
   // The offset field is represented in the kForwardingOffsetBits
   // most-significant bits.
   uintptr_t offset = (value_ >> kForwardingOffsetShift) << kObjectAlignmentBits;
   ASSERT(offset < static_cast<uintptr_t>(Page::kObjectAreaSize));
@@ skipping 2040 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_