hotspot/src/share/vm/oops/instanceClassLoaderKlass.cpp
author coleenp
Sat, 01 Sep 2012 13:25:18 -0400
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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
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/*
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 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "gc_implementation/shared/markSweep.inline.hpp"
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#include "gc_interface/collectedHeap.inline.hpp"
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#include "memory/genOopClosures.inline.hpp"
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#include "memory/oopFactory.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/instanceClassLoaderKlass.hpp"
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#include "oops/instanceMirrorKlass.hpp"
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#include "oops/instanceOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/symbol.hpp"
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#include "runtime/handles.inline.hpp"
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#ifndef SERIALGC
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#include "gc_implementation/parNew/parOopClosures.inline.hpp"
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#include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
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#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
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#include "oops/oop.pcgc.inline.hpp"
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#endif
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#define if_do_metadata_checked(closure, nv_suffix)                    \
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  /* Make sure the non-virtual and the virtual versions match. */     \
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  assert(closure->do_metadata##nv_suffix() == closure->do_metadata(), \
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      "Inconsistency in do_metadata");                                \
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  if (closure->do_metadata##nv_suffix())
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// Macro to define instanceClassLoaderKlass::oop_oop_iterate for virtual/nonvirtual for
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// all closures.  Macros calling macros above for each oop size.
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// Since ClassLoader objects have only a pointer to the loader_data, they are not
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// compressed nor does the pointer move.
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#define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)\
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                                                                                \
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int instanceClassLoaderKlass::                                                  \
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oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) {                  \
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  /* Get size before changing pointers */                                       \
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  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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  int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure);           \
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                                                                                \
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  if_do_metadata_checked(closure, nv_suffix) {                                  \
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    ClassLoaderData* cld = java_lang_ClassLoader::loader_data(obj);             \
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    /* cld can be null if we have a non-registered class loader. */             \
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    if (cld != NULL) {                                                          \
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      closure->do_class_loader_data(cld);                                       \
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    }                                                                           \
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  }                                                                             \
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                                                                                \
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  return size;                                                                  \
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}
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#ifndef SERIALGC
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#define InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
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                                                                                \
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int instanceClassLoaderKlass::                                                  \
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oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) {        \
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  /* Get size before changing pointers */                                       \
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  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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  int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
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  return size;                                                                  \
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}
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#endif // !SERIALGC
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#define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix)      \
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                                                                                \
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int instanceClassLoaderKlass::                                                  \
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oop_oop_iterate##nv_suffix##_m(oop obj,                                         \
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                               OopClosureType* closure,                         \
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                               MemRegion mr) {                                  \
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  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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                                                                                \
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  int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr);   \
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                                                                                \
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  if_do_metadata_checked(closure, nv_suffix) {                                  \
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    if (mr.contains(obj)) {                                                     \
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      ClassLoaderData* cld = java_lang_ClassLoader::loader_data(obj);           \
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      /* cld can be null if we have a non-registered class loader. */           \
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      if (cld != NULL) {                                                        \
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        closure->do_class_loader_data(cld);                                     \
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      }                                                                         \
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    }                                                                           \
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  }                                                                             \
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                                                                                \
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  return size;                                                                  \
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}
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN)
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#ifndef SERIALGC
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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#endif // SERIALGC
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m)
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void instanceClassLoaderKlass::oop_follow_contents(oop obj) {
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  InstanceKlass::oop_follow_contents(obj);
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  ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
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  // We must NULL check here, since the class loader
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  // can be found before the loader data has been set up.
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  if(loader_data != NULL) {
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    MarkSweep::follow_class_loader(loader_data);
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  }
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}
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#ifndef SERIALGC
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void instanceClassLoaderKlass::oop_follow_contents(ParCompactionManager* cm,
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        oop obj) {
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  InstanceKlass::oop_follow_contents(cm, obj);
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  ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
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  if (loader_data != NULL) {
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    PSParallelCompact::follow_class_loader(cm, loader_data);
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  }
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}
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void instanceClassLoaderKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
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  InstanceKlass::oop_push_contents(pm, obj);
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  // This is called by the young collector. It will already have taken care of
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  // all class loader data. So, we don't have to follow the class loader ->
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  // class loader data link.
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}
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int instanceClassLoaderKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
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  InstanceKlass::oop_update_pointers(cm, obj);
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  ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
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  if (loader_data != NULL) {
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    PSParallelCompact::adjust_class_loader(cm, loader_data);
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  }
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  return size_helper();
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}
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#endif // SERIALGC
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