view src/share/vm/oops/compiledICHolderKlass.cpp @ 452:00b023ae2d78

6722113: CMS: Incorrect overflow handling during precleaning of Reference lists Summary: When we encounter marking stack overflow during precleaning of Reference lists, we were using the overflow list mechanism, which can cause problems on account of mutating the mark word of the header because of conflicts with mutator accesses and updates of that field. Instead we should use the usual mechanism for overflow handling in concurrent phases, namely dirtying of the card on which the overflowed object lies. Since precleaning effectively does a form of discovered list processing, albeit with discovery enabled, we needed to adjust some code to be correct in the face of interleaved processing and discovery. Reviewed-by: apetrusenko, jcoomes
author ysr
date Thu, 20 Nov 2008 12:27:41 -0800
parents a61af66fc99e
children 4e6abf09f540
line wrap: on
line source

/*
 * Copyright 1998-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

# include "incls/_precompiled.incl"
# include "incls/_compiledICHolderKlass.cpp.incl"

klassOop compiledICHolderKlass::create_klass(TRAPS) {
  compiledICHolderKlass o;
  KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
  KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);
  // Make sure size calculation is right
  assert(k()->size() == align_object_size(header_size()), "wrong size for object");
  java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
  return k();
}


compiledICHolderOop compiledICHolderKlass::allocate(TRAPS) {
  KlassHandle h_k(THREAD, as_klassOop());
  int size = compiledICHolderOopDesc::object_size();
  compiledICHolderOop c = (compiledICHolderOop)
    CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
  c->set_holder_method(NULL);
  c->set_holder_klass(NULL);
  return c;
}


int compiledICHolderKlass::oop_size(oop obj) const {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  return compiledICHolderOop(obj)->object_size();
}

void compiledICHolderKlass::oop_follow_contents(oop obj) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);

  obj->follow_header();
  MarkSweep::mark_and_push(c->adr_holder_method());
  MarkSweep::mark_and_push(c->adr_holder_klass());
}

#ifndef SERIALGC
void compiledICHolderKlass::oop_follow_contents(ParCompactionManager* cm,
                                                oop obj) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);

  obj->follow_header(cm);
  PSParallelCompact::mark_and_push(cm, c->adr_holder_method());
  PSParallelCompact::mark_and_push(cm, c->adr_holder_klass());
}
#endif // SERIALGC


int compiledICHolderKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);
  // Get size before changing pointers.
  // Don't call size() or oop_size() since that is a virtual call.
  int size = c->object_size();

  obj->oop_iterate_header(blk);
  blk->do_oop(c->adr_holder_method());
  blk->do_oop(c->adr_holder_klass());
  return size;
}

int compiledICHolderKlass::oop_oop_iterate_m(oop obj, OopClosure* blk,
                                              MemRegion mr) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);
  // Get size before changing pointers.
  // Don't call size() or oop_size() since that is a virtual call.
  int size = c->object_size();

  obj->oop_iterate_header(blk, mr);

  oop* adr;
  adr = c->adr_holder_method();
  if (mr.contains(adr)) blk->do_oop(adr);
  adr = c->adr_holder_klass();
  if (mr.contains(adr)) blk->do_oop(adr);
  return size;
}


int compiledICHolderKlass::oop_adjust_pointers(oop obj) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);
  // Get size before changing pointers.
  // Don't call size() or oop_size() since that is a virtual call.
  int size = c->object_size();

  MarkSweep::adjust_pointer(c->adr_holder_method());
  MarkSweep::adjust_pointer(c->adr_holder_klass());
  obj->adjust_header();
  return size;
}

#ifndef SERIALGC
void compiledICHolderKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
}

void compiledICHolderKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
}

int compiledICHolderKlass::oop_update_pointers(ParCompactionManager* cm,
                                               oop obj) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);

  PSParallelCompact::adjust_pointer(c->adr_holder_method());
  PSParallelCompact::adjust_pointer(c->adr_holder_klass());
  return c->object_size();
}

int compiledICHolderKlass::oop_update_pointers(ParCompactionManager* cm,
                                               oop obj,
                                               HeapWord* beg_addr,
                                               HeapWord* end_addr) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);

  oop* p;
  p = c->adr_holder_method();
  PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
  p = c->adr_holder_klass();
  PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
  return c->object_size();
}
#endif // SERIALGC

#ifndef PRODUCT

// Printing

void compiledICHolderKlass::oop_print_on(oop obj, outputStream* st) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  Klass::oop_print_on(obj, st);
  compiledICHolderOop c = compiledICHolderOop(obj);
  st->print(" - method: "); c->holder_method()->print_value_on(st); st->cr();
  st->print(" - klass:  "); c->holder_klass()->print_value_on(st); st->cr();
}


void compiledICHolderKlass::oop_print_value_on(oop obj, outputStream* st) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  Klass::oop_print_value_on(obj, st);
}
#endif

const char* compiledICHolderKlass::internal_name() const {
  return "{compiledICHolder}";
}

// Verification

void compiledICHolderKlass::oop_verify_on(oop obj, outputStream* st) {
  Klass::oop_verify_on(obj, st);
  guarantee(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);
  guarantee(c->is_perm(),             "should be in permspace");
  guarantee(c->holder_method()->is_perm(),   "should be in permspace");
  guarantee(c->holder_method()->is_method(), "should be method");
  guarantee(c->holder_klass()->is_perm(),    "should be in permspace");
  guarantee(c->holder_klass()->is_klass(),   "should be klass");
}