1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "memory/iterator.hpp"
  27 #include "oops/oop.inline.hpp"
  28 
  29 void KlassToOopClosure::do_klass(Klass* k) {
  30   k->oops_do(_oop_closure);
  31 }
  32 
  33 void CLDToOopClosure::do_cld(ClassLoaderData* cld) {
  34   cld->oops_do(_oop_closure, &_klass_closure, _must_claim_cld);
  35 }
  36 
  37 void ObjectToOopClosure::do_object(oop obj) {
  38   obj->oop_iterate(_cl);
  39 }
  40 
  41 void VoidClosure::do_void() {
  42   ShouldNotCallThis();
  43 }
  44 
  45 MarkingCodeBlobClosure::MarkScope::MarkScope(bool activate)
  46   : _active(activate)
  47 {
  48   if (_active)  nmethod::oops_do_marking_prologue();
  49 }
  50 
  51 MarkingCodeBlobClosure::MarkScope::~MarkScope() {
  52   if (_active)  nmethod::oops_do_marking_epilogue();
  53 }
  54 
  55 void MarkingCodeBlobClosure::do_code_blob(CodeBlob* cb) {
  56   nmethod* nm = cb->as_nmethod_or_null();
  57   if (nm == NULL)  return;
  58   if (!nm->test_set_oops_do_mark()) {
  59     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, 1st visit\n"));
  60     do_newly_marked_nmethod(nm);
  61   } else {
  62     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, skipped on 2nd visit\n"));
  63   }
  64 }
  65 
  66 void CodeBlobToOopClosure::do_newly_marked_nmethod(nmethod* nm) {
  67   nm->oops_do(_cl, /*allow_zombie=*/ false);
  68 }
  69 
  70 void CodeBlobToOopClosure::do_code_blob(CodeBlob* cb) {
  71   if (!_do_marking) {
  72     nmethod* nm = cb->as_nmethod_or_null();
  73     NOT_PRODUCT(if (TraceScavenge && Verbose && nm != NULL)  nm->print_on(tty, "oops_do, unmarked visit\n"));
  74     // This assert won't work, since there are lots of mini-passes
  75     // (mostly in debug mode) that co-exist with marking phases.
  76     //assert(!(cb->is_nmethod() && ((nmethod*)cb)->test_oops_do_mark()), "found marked nmethod during mark-free phase");
  77     if (nm != NULL) {
  78       nm->oops_do(_cl);
  79     }
  80   } else {
  81     MarkingCodeBlobClosure::do_code_blob(cb);
  82   }
  83 }
  84 
  85