Make top and limit field in AllocationInfo private, assert on non-aligned setting of these fields, …

src/objects.cc

 // Copyright 2013 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 9138 matching lines @@
 
   Address start_of_string = string->address();
   ASSERT_OBJECT_ALIGNED(start_of_string);
   ASSERT_OBJECT_ALIGNED(start_of_string + new_size);
 
   Heap* heap = string->GetHeap();
   NewSpace* newspace = heap->new_space();
   if (newspace->Contains(start_of_string) &&
       newspace->top() == start_of_string + old_size) {
     // Last allocated object in new space.  Simply lower allocation top.
-    *(newspace->allocation_top_address()) = start_of_string + new_size;
+    newspace->set_top(start_of_string + new_size);
   } else {
     // Sizes are pointer size aligned, so that we can use filler objects
     // that are a multiple of pointer size.
     heap->CreateFillerObjectAt(start_of_string + new_size, delta);
   }
   if (Marking::IsBlack(Marking::MarkBitFrom(start_of_string))) {
     MemoryChunk::IncrementLiveBytesFromMutator(start_of_string, -delta);
   }
 
 
@@ skipping 7228 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal