jdk/hotspot/src/share/vm/oops/instanceRefKlass.inline.hpp

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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP
#define SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP

#include "classfile/javaClasses.hpp"
#include "memory/referenceProcessor.hpp"
#include "oops/instanceRefKlass.hpp"
#include "oops/instanceKlass.inline.hpp"
#include "oops/oop.inline.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"

template <bool nv, typename T, class OopClosureType, class Contains>
void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) {
  T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
  if (closure->apply_to_weak_ref_discovered_field()) {
    Devirtualizer<nv>::do_oop(closure, disc_addr);
  }

  T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
  T heap_oop = oopDesc::load_heap_oop(referent_addr);
  ReferenceProcessor* rp = closure->_ref_processor;
  if (!oopDesc::is_null(heap_oop)) {
    oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
    if (!referent->is_gc_marked() && (rp != NULL) &&
        rp->discover_reference(obj, reference_type())) {
      return;
    } else if (contains(referent_addr)) {
      // treat referent as normal oop
      Devirtualizer<nv>::do_oop(closure, referent_addr);
    }
  }
  T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
  T next_oop  = oopDesc::load_heap_oop(next_addr);
  // Treat discovered as normal oop, if ref is not "active" (next non-NULL)
  if (!oopDesc::is_null(next_oop) && contains(disc_addr)) {
    // i.e. ref is not "active"
    debug_only(
      if(TraceReferenceGC && PrintGCDetails) {
        gclog_or_tty->print_cr("   Process discovered as normal "
                               PTR_FORMAT, p2i(disc_addr));
      }
    )
    Devirtualizer<nv>::do_oop(closure, disc_addr);
  }
  // treat next as normal oop
  if (contains(next_addr)) {
    Devirtualizer<nv>::do_oop(closure, next_addr);
  }
}

class AlwaysContains {
 public:
  template <typename T> bool operator()(T* p) const { return true; }
};

template <bool nv, class OopClosureType>
void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure) {
  AlwaysContains always_contains;
  if (UseCompressedOops) {
    oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, always_contains);
  } else {
    oop_oop_iterate_ref_processing_specialized<nv, oop>(obj, closure, always_contains);
  }
}

class MrContains {
  const MemRegion _mr;
 public:
  MrContains(MemRegion mr) : _mr(mr) {}
  template <typename T> bool operator()(T* p) const { return _mr.contains(p); }
};

template <bool nv, class OopClosureType>
void InstanceRefKlass::oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
  const MrContains contains(mr);
  if (UseCompressedOops) {
    oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, contains);
  } else {
    oop_oop_iterate_ref_processing_specialized<nv, oop>(obj, closure, contains);
  }
}

template <bool nv, class OopClosureType>
int InstanceRefKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
  // Get size before changing pointers
  int size = InstanceKlass::oop_oop_iterate<nv>(obj, closure);

  oop_oop_iterate_ref_processing<nv>(obj, closure);

  return size;
}

#if INCLUDE_ALL_GCS
template <bool nv, class OopClosureType>
int InstanceRefKlass::
oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
  // Get size before changing pointers
  int size = InstanceKlass::oop_oop_iterate_reverse<nv>(obj, closure);

  oop_oop_iterate_ref_processing<nv>(obj, closure);

  return size;
}
#endif // INCLUDE_ALL_GCS


template <bool nv, class OopClosureType>
int InstanceRefKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
  // Get size before changing pointers
  int size = InstanceKlass::oop_oop_iterate_bounded<nv>(obj, closure, mr);

  oop_oop_iterate_ref_processing_bounded<nv>(obj, closure, mr);

  return size;
}

// Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
// all closures.  Macros calling macros above for each oop size.

#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)              \
                                                                                      \
int InstanceRefKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) {  \
  return oop_oop_iterate<nvs_to_bool(nv_suffix)>(obj, closure);                       \
}

#if INCLUDE_ALL_GCS
#define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix)              \
                                                                                                \
int InstanceRefKlass::oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) {  \
  return oop_oop_iterate_reverse<nvs_to_bool(nv_suffix)>(obj, closure);                         \
}
#else
#define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix)
#endif


#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix)                              \
                                                                                                        \
int InstanceRefKlass::oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* closure, MemRegion mr) {  \
  return oop_oop_iterate_bounded<nvs_to_bool(nv_suffix)>(obj, closure, mr);                             \
}

#define ALL_INSTANCE_REF_KLASS_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)  \
  InstanceRefKlass_OOP_OOP_ITERATE_DEFN(          OopClosureType, nv_suffix)    \
  InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(        OopClosureType, nv_suffix)    \
  InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix)


#endif // SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP