Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2010, 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

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  */

 #include "precompiled.hpp"

 #include "gc_implementation/shared/markSweep.inline.hpp"

 #include "gc_interface/collectedHeap.hpp"

 #include "gc_interface/collectedHeap.inline.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/permGen.hpp"

 #include "oops/constantPoolKlass.hpp"

 #include "oops/instanceKlass.hpp"

 #include "oops/instanceOop.hpp"

 #include "oops/klassKlass.hpp"

 #include "oops/klassOop.hpp"

 #include "oops/methodKlass.hpp"

 #include "oops/objArrayKlass.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/oop.inline2.hpp"

 #include "oops/symbol.hpp"

 #include "oops/typeArrayKlass.hpp"

 #include "runtime/handles.inline.hpp"

 #ifndef SERIALGC

 #include "oops/oop.pcgc.inline.hpp"

 #endif

 int klassKlass::oop_size(oop obj) const {

   assert (obj->is_klass(), "must be a klassOop");

   return klassOop(obj)->klass_part()->klass_oop_size();

 }

 klassOop klassKlass::create_klass(TRAPS) {

   KlassHandle h_this_klass;

   klassKlass o;

   // for bootstrapping, handles may not be available yet.

   klassOop k = base_create_klass_oop(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);

   k->set_klass(k); // point to thyself

   // Do not try to allocate mirror, java.lang.Class not loaded at this point.

   // See Universe::fixup_mirrors()

   return k;

 }

 void klassKlass::oop_follow_contents(oop obj) {

   Klass* k = Klass::cast(klassOop(obj));

   // If we are alive it is valid to keep our superclass and subtype caches alive

   MarkSweep::mark_and_push(k->adr_super());

   for (juint i = 0; i < Klass::primary_super_limit(); i++)

     MarkSweep::mark_and_push(k->adr_primary_supers()+i);

   MarkSweep::mark_and_push(k->adr_secondary_super_cache());

   MarkSweep::mark_and_push(k->adr_secondary_supers());

   MarkSweep::mark_and_push(k->adr_java_mirror());

   // We follow the subklass and sibling links at the end of the

   // marking phase, since otherwise following them will prevent

   // class unloading (all classes are transitively linked from

   // java.lang.Object).

   MarkSweep::revisit_weak_klass_link(k);

   obj->follow_header();

 }

 #ifndef SERIALGC

 void klassKlass::oop_follow_contents(ParCompactionManager* cm,

                                      oop obj) {

   Klass* k = Klass::cast(klassOop(obj));

   // If we are alive it is valid to keep our superclass and subtype caches alive

   PSParallelCompact::mark_and_push(cm, k->adr_super());

   for (juint i = 0; i < Klass::primary_super_limit(); i++)

     PSParallelCompact::mark_and_push(cm, k->adr_primary_supers()+i);

   PSParallelCompact::mark_and_push(cm, k->adr_secondary_super_cache());

   PSParallelCompact::mark_and_push(cm, k->adr_secondary_supers());

   PSParallelCompact::mark_and_push(cm, k->adr_java_mirror());

   // We follow the subklass and sibling links at the end of the

   // marking phase, since otherwise following them will prevent

   // class unloading (all classes are transitively linked from

   // java.lang.Object).

   PSParallelCompact::revisit_weak_klass_link(cm, k);

   obj->follow_header(cm);

 }

 #endif // SERIALGC

 int klassKlass::oop_oop_iterate(oop obj, OopClosure* blk) {

   // Get size before changing pointers

   int size = oop_size(obj);

   Klass* k = Klass::cast(klassOop(obj));

   blk->do_oop(k->adr_super());

   for (juint i = 0; i < Klass::primary_super_limit(); i++)

     blk->do_oop(k->adr_primary_supers()+i);

   blk->do_oop(k->adr_secondary_super_cache());

   blk->do_oop(k->adr_secondary_supers());

   blk->do_oop(k->adr_java_mirror());

   // The following are in the perm gen and are treated

   // specially in a later phase of a perm gen collection; ...

   assert(oop(k)->is_perm(), "should be in perm");

   assert(oop(k->subklass())->is_perm_or_null(), "should be in perm");

   assert(oop(k->next_sibling())->is_perm_or_null(), "should be in perm");

   // ... don't scan them normally, but remember this klassKlass

   // for later (see, for instance, oop_follow_contents above

   // for what MarkSweep does with it.

   if (blk->should_remember_klasses()) {

     blk->remember_klass(k);

   }

   obj->oop_iterate_header(blk);

   return size;

 }

 int klassKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

   // Get size before changing pointers

   int size = oop_size(obj);

   Klass* k = Klass::cast(klassOop(obj));

   oop* adr;

   adr = k->adr_super();

   if (mr.contains(adr)) blk->do_oop(adr);

   for (juint i = 0; i < Klass::primary_super_limit(); i++) {

     adr = k->adr_primary_supers()+i;

     if (mr.contains(adr)) blk->do_oop(adr);

   }

   adr = k->adr_secondary_super_cache();

   if (mr.contains(adr)) blk->do_oop(adr);

   adr = k->adr_secondary_supers();

   if (mr.contains(adr)) blk->do_oop(adr);

   adr = k->adr_java_mirror();

   if (mr.contains(adr)) blk->do_oop(adr);

   // The following are "weak links" in the perm gen and are

   // treated specially in a later phase of a perm gen collection.

   assert(oop(k)->is_perm(), "should be in perm");

   assert(oop(k->adr_subklass())->is_perm(), "should be in perm");

   assert(oop(k->adr_next_sibling())->is_perm(), "should be in perm");

   if (blk->should_remember_klasses()

       && (mr.contains(k->adr_subklass())

           || mr.contains(k->adr_next_sibling()))) {

     blk->remember_klass(k);

   }

   obj->oop_iterate_header(blk, mr);

   return size;

 }

 int klassKlass::oop_adjust_pointers(oop obj) {

   // Get size before changing pointers

   int size = oop_size(obj);

   obj->adjust_header();

   Klass* k = Klass::cast(klassOop(obj));

   MarkSweep::adjust_pointer(k->adr_super());

   for (juint i = 0; i < Klass::primary_super_limit(); i++)

     MarkSweep::adjust_pointer(k->adr_primary_supers()+i);

   MarkSweep::adjust_pointer(k->adr_secondary_super_cache());

   MarkSweep::adjust_pointer(k->adr_secondary_supers());

   MarkSweep::adjust_pointer(k->adr_java_mirror());

   MarkSweep::adjust_pointer(k->adr_subklass());

   MarkSweep::adjust_pointer(k->adr_next_sibling());

   return size;

 }

 #ifndef SERIALGC

 void klassKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {

 }

 int klassKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {

   Klass* k = Klass::cast(klassOop(obj));

   oop* const beg_oop = k->oop_block_beg();

   oop* const end_oop = k->oop_block_end();

   for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {

     PSParallelCompact::adjust_pointer(cur_oop);

   }

   return oop_size(obj);

 }

 int klassKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,

                                     HeapWord* beg_addr, HeapWord* end_addr) {

   Klass* k = Klass::cast(klassOop(obj));

   oop* const beg_oop = MAX2((oop*)beg_addr, k->oop_block_beg());

   oop* const end_oop = MIN2((oop*)end_addr, k->oop_block_end());

   for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {

     PSParallelCompact::adjust_pointer(cur_oop);

   }

   return oop_size(obj);

 }

 #endif // SERIALGC

 // Printing

 void klassKlass::oop_print_on(oop obj, outputStream* st) {

   Klass::oop_print_on(obj, st);

 }

 void klassKlass::oop_print_value_on(oop obj, outputStream* st) {

   Klass::oop_print_value_on(obj, st);

 }

 const char* klassKlass::internal_name() const {

   return "{other class}";

 }

 // Verification

 void klassKlass::oop_verify_on(oop obj, outputStream* st) {

   Klass::oop_verify_on(obj, st);

   guarantee(obj->is_perm(),                      "should be in permspace");

   guarantee(obj->is_klass(),                     "should be klass");

   Klass* k = Klass::cast(klassOop(obj));

   if (k->super() != NULL) {

     guarantee(k->super()->is_perm(),             "should be in permspace");

     guarantee(k->super()->is_klass(),            "should be klass");

   }

   klassOop ko = k->secondary_super_cache();

   if( ko != NULL ) {

     guarantee(ko->is_perm(),                     "should be in permspace");

     guarantee(ko->is_klass(),                    "should be klass");

   }

   for( uint i = 0; i < primary_super_limit(); i++ ) {

     oop ko = k->adr_primary_supers()[i]; // Cannot use normal accessor because it asserts

     if( ko != NULL ) {

       guarantee(ko->is_perm(),                   "should be in permspace");

       guarantee(ko->is_klass(),                  "should be klass");

     }

   }

   if (k->java_mirror() != NULL || (k->oop_is_instance() && instanceKlass::cast(klassOop(obj))->is_loaded())) {

     guarantee(k->java_mirror() != NULL,          "should be allocated");

     guarantee(k->java_mirror()->is_perm(),       "should be in permspace");

     guarantee(k->java_mirror()->is_instance(),   "should be instance");

   }

 }