1 /*
   2  * Copyright (c) 1997, 2012, 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 ObjectToOopClosure::do_object(oop obj) {
  34   obj->oop_iterate(_cl);
  35 }
  36 
  37 void VoidClosure::do_void() {
  38   ShouldNotCallThis();
  39 }
  40 
  41 MarkingCodeBlobClosure::MarkScope::MarkScope(bool activate)
  42   : _active(activate)
  43 {
  44   if (_active)  nmethod::oops_do_marking_prologue();
  45 }
  46 
  47 MarkingCodeBlobClosure::MarkScope::~MarkScope() {
  48   if (_active)  nmethod::oops_do_marking_epilogue();
  49 }
  50 
  51 void MarkingCodeBlobClosure::do_code_blob(CodeBlob* cb) {
  52   nmethod* nm = cb->as_nmethod_or_null();
  53   if (nm == NULL)  return;
  54   if (!nm->test_set_oops_do_mark()) {
  55     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, 1st visit\n"));
  56     do_newly_marked_nmethod(nm);
  57   } else {
  58     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, skipped on 2nd visit\n"));
  59   }
  60 }
  61 
  62 void CodeBlobToOopClosure::do_newly_marked_nmethod(nmethod* nm) {
  63   nm->oops_do(_cl, /*do_strong_roots_only=*/ true);
  64 }
  65 
  66 void CodeBlobToOopClosure::do_code_blob(CodeBlob* cb) {
  67   if (!_do_marking) {
  68     nmethod* nm = cb->as_nmethod_or_null();
  69     NOT_PRODUCT(if (TraceScavenge && Verbose && nm != NULL)  nm->print_on(tty, "oops_do, unmarked visit\n"));
  70     // This assert won't work, since there are lots of mini-passes
  71     // (mostly in debug mode) that co-exist with marking phases.
  72     //assert(!(cb->is_nmethod() && ((nmethod*)cb)->test_oops_do_mark()), "found marked nmethod during mark-free phase");
  73     if (nm != NULL) {
  74       nm->oops_do(_cl);
  75     }
  76   } else {
  77     MarkingCodeBlobClosure::do_code_blob(cb);
  78   }
  79 }
  80 
  81