536 // used only for asserts

   537 bool oopDesc::is_oop(bool ignore_mark_word) const {

   538   oop obj = (oop) this;

   539   if (!check_obj_alignment(obj)) return false;

   540   if (!Universe::heap()->is_in_reserved(obj)) return false;

   541   // obj is aligned and accessible in heap

   542   if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;

   543 

   544   // Header verification: the mark is typically non-NULL. If we're

   545   // at a safepoint, it must not be null.

   546   // Outside of a safepoint, the header could be changing (for example,

   547   // another thread could be inflating a lock on this object).

   548   if (ignore_mark_word) {

   549     return true;

   550   }

   551   if (mark() != NULL) {

   552     return true;

   553   }

   554   return !SafepointSynchronize::is_at_safepoint();

   555 }

   556 

   557 

   558 // used only for asserts

   559 bool oopDesc::is_oop_or_null(bool ignore_mark_word) const {

   560   return this == NULL ? true : is_oop(ignore_mark_word);

   561 }

   562 

   563 #ifndef PRODUCT

   564 // used only for asserts

   565 bool oopDesc::is_unlocked_oop() const {

   566   if (!Universe::heap()->is_in_reserved(this)) return false;

   567   return mark()->is_unlocked();

   568 }

   569 #endif // PRODUCT

   570