/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

#ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP

#define SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP

#include "classfile/javaClasses.inline.hpp"

#include "gc/shared/referenceProcessor.hpp"

#include "logging/log.hpp"

#include "oops/instanceKlass.inline.hpp"

#include "oops/instanceRefKlass.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::do_referent(oop obj, OopClosureType* closure, Contains& contains) {

  T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);

  if (contains(referent_addr)) {

    Devirtualizer<nv>::do_oop(closure, referent_addr);

  }

}

template <bool nv, typename T, class OopClosureType, class Contains>

void InstanceRefKlass::do_next(oop obj, OopClosureType* closure, Contains& contains) {

  T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);

  if (contains(next_addr)) {

    Devirtualizer<nv>::do_oop(closure, next_addr);

  }

}

template <bool nv, typename T, class OopClosureType, class Contains>

void InstanceRefKlass::do_discovered(oop obj, OopClosureType* closure, Contains& contains) {

  T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);

  if (contains(discovered_addr)) {

    Devirtualizer<nv>::do_oop(closure, discovered_addr);

  }

}

template <typename T, class OopClosureType>

bool InstanceRefKlass::try_discover(oop obj, ReferenceType type, OopClosureType* closure) {

  ReferenceProcessor* rp = closure->ref_processor();

  if (rp != NULL) {

    T referent_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::referent_addr(obj));

    if (!oopDesc::is_null(referent_oop)) {

      oop referent = oopDesc::decode_heap_oop_not_null(referent_oop);

      if (!referent->is_gc_marked()) {

        // Only try to discover if not yet marked.

        return rp->discover_reference(obj, type);

      }

    }

  }

  return false;

}

template <bool nv, typename T, class OopClosureType, class Contains>

void InstanceRefKlass::oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {

  // Try to discover reference and return if it succeeds.

  if (try_discover<T>(obj, type, closure)) {

    return;

  }

  // Treat referent as normal oop.

  do_referent<nv, T>(obj, closure, contains);

  // Treat discovered as normal oop, if ref is not "active" (next non-NULL).

  T next_oop  = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::next_addr(obj));

  if (!oopDesc::is_null(next_oop)) {

    do_discovered<nv, T>(obj, closure, contains);

  }

  // Treat next as normal oop.

  do_next<nv, T>(obj, closure, contains);

}

template <bool nv, typename T, class OopClosureType, class Contains>

void InstanceRefKlass::oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains) {

  do_referent<nv, T>(obj, closure, contains);

  do_discovered<nv, T>(obj, closure, contains);

  do_next<nv, T>(obj, closure, contains);

}

template <bool nv, typename T, class OopClosureType, class Contains>

void InstanceRefKlass::oop_oop_iterate_discovered_and_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {

  // Explicitly apply closure to the discovered field.

  do_discovered<nv, T>(obj, closure, contains);

  // Then do normal reference processing with discovery.

  oop_oop_iterate_discovery<nv, T>(obj, type, closure, contains);

}

template <bool nv, typename T, class OopClosureType, class Contains>

void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) {

  switch (closure->reference_iteration_mode()) {

    case ExtendedOopClosure::DO_DISCOVERY:

      oop_oop_iterate_discovery<nv, T>(obj, reference_type(), closure, contains);

      break;

    case ExtendedOopClosure::DO_DISCOVERED_AND_DISCOVERY:

      oop_oop_iterate_discovered_and_discovery<nv, T>(obj, reference_type(), closure, contains);

      break;

    case ExtendedOopClosure::DO_FIELDS:

      oop_oop_iterate_fields<nv, T>(obj, closure, contains);

      break;

    default:

      ShouldNotReachHere();

  }

}

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>

void InstanceRefKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {

  InstanceKlass::oop_oop_iterate<nv>(obj, closure);

  oop_oop_iterate_ref_processing<nv>(obj, closure);

}

#if INCLUDE_ALL_GCS

template <bool nv, class OopClosureType>

void InstanceRefKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {

  InstanceKlass::oop_oop_iterate_reverse<nv>(obj, closure);

  oop_oop_iterate_ref_processing<nv>(obj, closure);

}

#endif // INCLUDE_ALL_GCS

template <bool nv, class OopClosureType>

void InstanceRefKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {

  InstanceKlass::oop_oop_iterate_bounded<nv>(obj, closure, mr);

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

}

#ifdef ASSERT

template <typename T>

  log_develop_trace(gc, ref)("     referent_addr/* " PTR_FORMAT " / " PTR_FORMAT,

      p2i(referent_addr), p2i(referent_addr ? (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL));

  log_develop_trace(gc, ref)("     next_addr/* " PTR_FORMAT " / " PTR_FORMAT,

      p2i(next_addr), p2i(next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL));

  log_develop_trace(gc, ref)("     discovered_addr/* " PTR_FORMAT " / " PTR_FORMAT,

      p2i(discovered_addr), p2i(discovered_addr ? (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL));

}

#endif

// Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for

// all closures.  Macros calling macros above for each oop size.

#define ALL_INSTANCE_REF_KLASS_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)  \

  OOP_OOP_ITERATE_DEFN(          InstanceRefKlass, OopClosureType, nv_suffix)   \

  OOP_OOP_ITERATE_DEFN_BOUNDED(  InstanceRefKlass, OopClosureType, nv_suffix)   \

  OOP_OOP_ITERATE_DEFN_BACKWARDS(InstanceRefKlass, OopClosureType, nv_suffix)

#endif // SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP