iterator.cpp revision 1483:1a5913bf5e19 
1/*
2 * Copyright 1997-2010 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25# include "incls/_precompiled.incl"
26# include "incls/_iterator.cpp.incl"
27
28#ifdef ASSERT
29bool OopClosure::_must_remember_klasses = false;
30#endif
31
32void ObjectToOopClosure::do_object(oop obj) {
33  obj->oop_iterate(_cl);
34}
35
36void VoidClosure::do_void() {
37  ShouldNotCallThis();
38}
39
40#ifdef ASSERT
41bool OopClosure::must_remember_klasses() {
42  return _must_remember_klasses;
43}
44void OopClosure::set_must_remember_klasses(bool v) {
45  _must_remember_klasses = v;
46}
47#endif
48
49
50MarkingCodeBlobClosure::MarkScope::MarkScope(bool activate)
51  : _active(activate)
52{
53  if (_active)  nmethod::oops_do_marking_prologue();
54}
55
56MarkingCodeBlobClosure::MarkScope::~MarkScope() {
57  if (_active)  nmethod::oops_do_marking_epilogue();
58}
59
60void MarkingCodeBlobClosure::do_code_blob(CodeBlob* cb) {
61  nmethod* nm = cb->as_nmethod_or_null();
62  if (nm == NULL)  return;
63  if (!nm->test_set_oops_do_mark()) {
64    NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, 1st visit\n"));
65    do_newly_marked_nmethod(nm);
66  } else {
67    NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, skipped on 2nd visit\n"));
68  }
69}
70
71void CodeBlobToOopClosure::do_newly_marked_nmethod(nmethod* nm) {
72  nm->oops_do(_cl, /*do_strong_roots_only=*/ true);
73}
74
75void CodeBlobToOopClosure::do_code_blob(CodeBlob* cb) {
76  if (!_do_marking) {
77    nmethod* nm = cb->as_nmethod_or_null();
78    NOT_PRODUCT(if (TraceScavenge && Verbose && nm != NULL)  nm->print_on(tty, "oops_do, unmarked visit\n"));
79    // This assert won't work, since there are lots of mini-passes
80    // (mostly in debug mode) that co-exist with marking phases.
81    //assert(!(cb->is_nmethod() && ((nmethod*)cb)->test_oops_do_mark()), "found marked nmethod during mark-free phase");
82    if (nm != NULL) {
83      nm->oops_do(_cl);
84    }
85  } else {
86    MarkingCodeBlobClosure::do_code_blob(cb);
87  }
88}
89
90
91