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Java example source code file (instanceMirrorKlass.cpp)

This example Java source code file (instanceMirrorKlass.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

all_oop_oop_iterate_closures_1, all_oop_oop_iterate_closures_2, include_all_gcs, instanceklass\:\:cast, instancemirrorklass_bounded_specialized_oop_iterate, instancemirrorklass_oop_iterate, instancemirrorklass_specialized_bounded_oop_iterate, instancemirrorklass_specialized_oop_iterate_defn, null, oopclosuretype, specializationstats\:\:record_iterate_call, t\*, usecompressedoops

The instanceMirrorKlass.cpp Java example source code

/*
 * Copyright (c) 2011, 2013, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/systemDictionary.hpp"
#include "gc_implementation/shared/markSweep.inline.hpp"
#include "gc_interface/collectedHeap.inline.hpp"
#include "memory/genOopClosures.inline.hpp"
#include "memory/oopFactory.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/instanceOop.hpp"
#include "oops/oop.inline.hpp"
#include "oops/symbol.hpp"
#include "runtime/handles.inline.hpp"
#include "utilities/macros.hpp"
#if INCLUDE_ALL_GCS
#include "gc_implementation/concurrentMarkSweep/cmsOopClosures.inline.hpp"
#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
#include "gc_implementation/g1/g1OopClosures.inline.hpp"
#include "gc_implementation/g1/g1RemSet.inline.hpp"
#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
#include "gc_implementation/parNew/parOopClosures.inline.hpp"
#include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
#include "oops/oop.pcgc.inline.hpp"
#endif // INCLUDE_ALL_GCS

int InstanceMirrorKlass::_offset_of_static_fields = 0;

#ifdef ASSERT
template <class T> void assert_is_in(T *p) {
  T heap_oop = oopDesc::load_heap_oop(p);
  if (!oopDesc::is_null(heap_oop)) {
    oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
    assert(Universe::heap()->is_in(o), "should be in heap");
  }
}
template <class T> void assert_is_in_closed_subset(T *p) {
  T heap_oop = oopDesc::load_heap_oop(p);
  if (!oopDesc::is_null(heap_oop)) {
    oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
    assert(Universe::heap()->is_in_closed_subset(o), "should be in closed");
  }
}
template <class T> void assert_is_in_reserved(T *p) {
  T heap_oop = oopDesc::load_heap_oop(p);
  if (!oopDesc::is_null(heap_oop)) {
    oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
    assert(Universe::heap()->is_in_reserved(o), "should be in reserved");
  }
}
template <class T> void assert_nothing(T *p) {}

#else
template <class T> void assert_is_in(T *p) {}
template <class T> void assert_is_in_closed_subset(T *p) {}
template <class T> void assert_is_in_reserved(T *p) {}
template <class T> void assert_nothing(T *p) {}
#endif // ASSERT

#define InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE( \
  T, start_p, count, do_oop,                         \
  assert_fn)                                         \
{                                                    \
  T* p         = (T*)(start_p);                      \
  T* const end = p + (count);                        \
  while (p < end) {                                  \
    (assert_fn)(p);                                  \
    do_oop;                                          \
    ++p;                                             \
  }                                                  \
}

#define InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \
  T, start_p, count, low, high,                              \
  do_oop, assert_fn)                                         \
{                                                            \
  T* const l = (T*)(low);                                    \
  T* const h = (T*)(high);                                   \
  assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 &&         \
         mask_bits((intptr_t)h, sizeof(T)-1) == 0,           \
         "bounded region must be properly aligned");         \
  T* p       = (T*)(start_p);                                \
  T* end     = p + (count);                                  \
  if (p < l) p = l;                                          \
  if (end > h) end = h;                                      \
  while (p < end) {                                          \
    (assert_fn)(p);                                          \
    do_oop;                                                  \
    ++p;                                                     \
  }                                                          \
}


#define InstanceMirrorKlass_OOP_ITERATE(start_p, count,    \
                                  do_oop, assert_fn)       \
{                                                          \
  if (UseCompressedOops) {                                 \
    InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \
      start_p, count,                                      \
      do_oop, assert_fn)                                   \
  } else {                                                 \
    InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE(oop,       \
      start_p, count,                                      \
      do_oop, assert_fn)                                   \
  }                                                        \
}

// The following macros call specialized macros, passing either oop or
// narrowOop as the specialization type.  These test the UseCompressedOops
// flag.
#define InstanceMirrorKlass_BOUNDED_OOP_ITERATE(start_p, count, low, high, \
                                          do_oop, assert_fn)               \
{                                                                          \
  if (UseCompressedOops) {                                                 \
    InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop,         \
      start_p, count,                                                      \
      low, high,                                                           \
      do_oop, assert_fn)                                                   \
  } else {                                                                 \
    InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop,               \
      start_p, count,                                                      \
      low, high,                                                           \
      do_oop, assert_fn)                                                   \
  }                                                                        \
}


void InstanceMirrorKlass::oop_follow_contents(oop obj) {
  InstanceKlass::oop_follow_contents(obj);

  // Follow the klass field in the mirror.
  Klass* klass = java_lang_Class::as_Klass(obj);
  if (klass != NULL) {
    // An anonymous class doesn't have its own class loader, so the call
    // to follow_klass will mark and push its java mirror instead of the
    // class loader. When handling the java mirror for an anonymous class
    // we need to make sure its class loader data is claimed, this is done
    // by calling follow_class_loader explicitly. For non-anonymous classes
    // the call to follow_class_loader is made when the class loader itself
    // is handled.
    if (klass->oop_is_instance() && InstanceKlass::cast(klass)->is_anonymous()) {
      MarkSweep::follow_class_loader(klass->class_loader_data());
    } else {
      MarkSweep::follow_klass(klass);
    }
  } else {
    // If klass is NULL then this a mirror for a primitive type.
    // We don't have to follow them, since they are handled as strong
    // roots in Universe::oops_do.
    assert(java_lang_Class::is_primitive(obj), "Sanity check");
  }

  InstanceMirrorKlass_OOP_ITERATE(                                                    \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),        \
    MarkSweep::mark_and_push(p),                                                      \
    assert_is_in_closed_subset)
}

#if INCLUDE_ALL_GCS
void InstanceMirrorKlass::oop_follow_contents(ParCompactionManager* cm,
                                              oop obj) {
  InstanceKlass::oop_follow_contents(cm, obj);

  // Follow the klass field in the mirror.
  Klass* klass = java_lang_Class::as_Klass(obj);
  if (klass != NULL) {
    // An anonymous class doesn't have its own class loader, so the call
    // to follow_klass will mark and push its java mirror instead of the
    // class loader. When handling the java mirror for an anonymous class
    // we need to make sure its class loader data is claimed, this is done
    // by calling follow_class_loader explicitly. For non-anonymous classes
    // the call to follow_class_loader is made when the class loader itself
    // is handled.
    if (klass->oop_is_instance() && InstanceKlass::cast(klass)->is_anonymous()) {
      PSParallelCompact::follow_class_loader(cm, klass->class_loader_data());
    } else {
      PSParallelCompact::follow_klass(cm, klass);
    }
  } else {
    // If klass is NULL then this a mirror for a primitive type.
    // We don't have to follow them, since they are handled as strong
    // roots in Universe::oops_do.
    assert(java_lang_Class::is_primitive(obj), "Sanity check");
  }

  InstanceMirrorKlass_OOP_ITERATE(                                                    \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),        \
    PSParallelCompact::mark_and_push(cm, p),                                          \
    assert_is_in)
}
#endif // INCLUDE_ALL_GCS

int InstanceMirrorKlass::oop_adjust_pointers(oop obj) {
  int size = oop_size(obj);
  InstanceKlass::oop_adjust_pointers(obj);

  InstanceMirrorKlass_OOP_ITERATE(                                                    \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),        \
    MarkSweep::adjust_pointer(p),                                                     \
    assert_nothing)
  return size;
}

#define InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(T, nv_suffix)                \
  InstanceMirrorKlass_OOP_ITERATE(                                                    \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),        \
      (closure)->do_oop##nv_suffix(p),                                                \
    assert_is_in_closed_subset)                                                       \
  return oop_size(obj);                                                               \

#define InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(T, nv_suffix, mr)         \
  InstanceMirrorKlass_BOUNDED_OOP_ITERATE(                                            \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),        \
    mr.start(), mr.end(),                                                             \
      (closure)->do_oop##nv_suffix(p),                                                \
    assert_is_in_closed_subset)                                                       \
  return oop_size(obj);                                                               \


#define if_do_metadata_checked(closure, nv_suffix)                    \
  /* Make sure the non-virtual and the virtual versions match. */     \
  assert(closure->do_metadata##nv_suffix() == closure->do_metadata(), \
      "Inconsistency in do_metadata");                                \
  if (closure->do_metadata##nv_suffix())

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

#define InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)           \
                                                                                      \
int InstanceMirrorKlass::                                                             \
oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) {                        \
  /* Get size before changing pointers */                                             \
  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);      \
                                                                                      \
  InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure);                            \
                                                                                      \
  if_do_metadata_checked(closure, nv_suffix) {                                        \
    Klass* klass = java_lang_Class::as_Klass(obj);                                    \
    /* We'll get NULL for primitive mirrors. */                                       \
    if (klass != NULL) {                                                              \
      closure->do_klass##nv_suffix(klass);                                            \
    }                                                                                 \
  }                                                                                   \
                                                                                      \
  if (UseCompressedOops) {                                                            \
    InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(narrowOop, nv_suffix);           \
  } else {                                                                            \
    InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(oop, nv_suffix);                 \
  }                                                                                   \
}

#if INCLUDE_ALL_GCS
#define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
                                                                                      \
int InstanceMirrorKlass::                                                             \
oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) {              \
  /* Get size before changing pointers */                                             \
  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);      \
                                                                                      \
  InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure);                  \
                                                                                      \
  if (UseCompressedOops) {                                                            \
    InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(narrowOop, nv_suffix);           \
  } else {                                                                            \
    InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(oop, nv_suffix);                 \
  }                                                                                   \
}
#endif // INCLUDE_ALL_GCS


#define InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix)         \
                                                                                      \
int InstanceMirrorKlass::                                                             \
oop_oop_iterate##nv_suffix##_m(oop obj,                                               \
                               OopClosureType* closure,                               \
                               MemRegion mr) {                                        \
  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);      \
                                                                                      \
  InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr);                    \
                                                                                      \
  if_do_metadata_checked(closure, nv_suffix) {                                        \
    if (mr.contains(obj)) {                                                           \
      Klass* klass = java_lang_Class::as_Klass(obj);                                  \
      /* We'll get NULL for primitive mirrors. */                                     \
      if (klass != NULL) {                                                            \
        closure->do_klass##nv_suffix(klass);                                          \
      }                                                                               \
    }                                                                                 \
  }                                                                                   \
                                                                                      \
  if (UseCompressedOops) {                                                            \
    InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr);    \
  } else {                                                                            \
    InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr);          \
  }                                                                                   \
}

ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN)
#if INCLUDE_ALL_GCS
ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
#endif // INCLUDE_ALL_GCS
ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m)

#if INCLUDE_ALL_GCS
void InstanceMirrorKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
  // Note that we don't have to follow the mirror -> klass pointer, since all
  // klasses that are dirty will be scavenged when we iterate over the
  // ClassLoaderData objects.

  InstanceKlass::oop_push_contents(pm, obj);
  InstanceMirrorKlass_OOP_ITERATE(                                            \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),\
    if (PSScavenge::should_scavenge(p)) {                                     \
      pm->claim_or_forward_depth(p);                                          \
    },                                                                        \
    assert_nothing )
}

int InstanceMirrorKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
  int size = oop_size(obj);
  InstanceKlass::oop_update_pointers(cm, obj);

  InstanceMirrorKlass_OOP_ITERATE(                                            \
    start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),\
    PSParallelCompact::adjust_pointer(p),                                     \
    assert_nothing)
  return size;
}
#endif // INCLUDE_ALL_GCS

int InstanceMirrorKlass::instance_size(KlassHandle k) {
  if (k() != NULL && k->oop_is_instance()) {
    return align_object_size(size_helper() + InstanceKlass::cast(k())->static_field_size());
  }
  return size_helper();
}

instanceOop InstanceMirrorKlass::allocate_instance(KlassHandle k, TRAPS) {
  // Query before forming handle.
  int size = instance_size(k);
  KlassHandle h_k(THREAD, this);
  instanceOop i = (instanceOop) CollectedHeap::Class_obj_allocate(h_k, size, k, CHECK_NULL);
  return i;
}

int InstanceMirrorKlass::oop_size(oop obj) const {
  return java_lang_Class::oop_size(obj);
}

int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {
  Klass* k = java_lang_Class::as_Klass(obj);
  if (k != NULL && k->oop_is_instance()) {
    return InstanceKlass::cast(k)->static_oop_field_count();
  }
  return 0;
}

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