Use page header information to test for InNewSpace.

src/heap-inl.h

 // Copyright 2011 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 236 matching lines @@
   isolate_->counters()->objs_since_last_full()->Increment();
   isolate_->counters()->objs_since_last_young()->Increment();
 #endif
   MaybeObject* result = cell_space_->AllocateRaw(JSGlobalPropertyCell::kSize);
   if (result->IsFailure()) old_gen_exhausted_ = true;
   return result;
 }
 
 
 bool Heap::InNewSpace(Object* object) {
-  bool result = new_space_.Contains(object);
+  bool result = new_space_.PageContains(object);

[Erik Corry, 2011/05/19 07:22:32]

Not mad keen on this name, but I guess it will go away when the transition to
page-based new-space-contains is done.

[Lasse Reichstein, 2011/05/19 08:40:40]

That is the idea. 
If anything, this name is a little too nice. It should stand out like a sore
thumb, kindof like C++ casts.

   ASSERT(!result ||                  // Either not in new space
          gc_state_ != NOT_IN_GC ||   // ... or in the middle of GC
          InToSpace(object));         // ... or in to-space (where we allocate).
   return result;
 }
 
 
 bool Heap::InNewSpace(Address addr) {
   return new_space_.Contains(addr);
 }
 
 
+bool Heap::InNewSpacePage(Address addr) {
+  return new_space_.PageContains(addr);
+}
+
+
 bool Heap::InFromSpace(Object* object) {
   return new_space_.FromSpaceContains(object);
 }
 
 
 bool Heap::InToSpace(Object* object) {
   return new_space_.ToSpaceContains(object);
 }
 
 
@@ skipping 408 matching lines @@
 
 
 Heap* _inline_get_heap_() {
   return HEAP;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_