Fix --heap-stats option on X64

src/spaces.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
@@ skipping 1888 matching lines @@
   PageIterator page_it(this, PageIterator::PAGES_IN_USE);
   while (page_it.has_next()) {
     Page* p = page_it.next();
 
     for (Address rset_addr = p->RSetStart();
          rset_addr < p->RSetEnd();
          rset_addr += kIntSize) {
       int rset = Memory::int_at(rset_addr);
       if (rset != 0) {
         // Bits were set
-        int intoff = rset_addr - p->address();
+        int intoff = rset_addr - p->address() - Page::kRSetOffset;
         int bitoff = 0;
         for (; bitoff < kBitsPerInt; ++bitoff) {
           if ((rset & (1 << bitoff)) != 0) {
             int bitpos = intoff*kBitsPerByte + bitoff;
             Address slot = p->OffsetToAddress(bitpos << kObjectAlignmentBits);
             Object** obj = reinterpret_cast<Object**>(slot);
             if (*obj == Heap::raw_unchecked_fixed_array_map()) {
               rset_marked_arrays++;
               FixedArray* fa = FixedArray::cast(HeapObject::FromAddress(slot));
 
@@ skipping 244 matching lines @@
   PageIterator page_it(this, PageIterator::PAGES_IN_USE);
   while (page_it.has_next()) {
     Page* p = page_it.next();
 
     for (Address rset_addr = p->RSetStart();
          rset_addr < p->RSetEnd();
          rset_addr += kIntSize) {
       int rset = Memory::int_at(rset_addr);
       if (rset != 0) {
         // Bits were set
-        int intoff = rset_addr - p->address();
+        int intoff = rset_addr - p->address() - Page::kRSetOffset;
         int bitoff = 0;
         for (; bitoff < kBitsPerInt; ++bitoff) {
           if ((rset & (1 << bitoff)) != 0) {
             int bitpos = intoff*kBitsPerByte + bitoff;
             Address slot = p->OffsetToAddress(bitpos << kObjectAlignmentBits);
             Object** obj = reinterpret_cast<Object**>(slot);
             rset_marked_pointers++;
             if (Heap::InNewSpace(*obj))
               cross_gen_pointers++;
           }
@@ skipping 473 matching lines @@
                      reinterpret_cast<Object**>(object->address()
                                                 + Page::kObjectAreaSize),
                      allocation_top);
       PrintF("\n");
     }
   }
 }
 #endif  // DEBUG
 
 } }  // namespace v8::internal