1 /*
   2  * Copyright (c) 1997, 2010, 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 #ifdef ASSERT
  30 bool OopClosure::_must_remember_klasses = false;
  31 #endif
  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 #ifdef ASSERT
  42 bool OopClosure::must_remember_klasses() {
  43   return _must_remember_klasses;
  44 }
  45 void OopClosure::set_must_remember_klasses(bool v) {
  46   _must_remember_klasses = v;
  47 }
  48 #endif
  49 
  50 
  51 MarkingCodeBlobClosure::MarkScope::MarkScope(bool activate)
  52   : _active(activate)
  53 {
  54   if (_active)  nmethod::oops_do_marking_prologue();
  55 }
  56 
  57 MarkingCodeBlobClosure::MarkScope::~MarkScope() {
  58   if (_active)  nmethod::oops_do_marking_epilogue();
  59 }
  60 
  61 void MarkingCodeBlobClosure::do_code_blob(CodeBlob* cb) {
  62   nmethod* nm = cb->as_nmethod_or_null();
  63   if (nm == NULL)  return;
  64   if (!nm->test_set_oops_do_mark()) {
  65     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, 1st visit\n"));
  66     do_newly_marked_nmethod(nm);
  67   } else {
  68     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, skipped on 2nd visit\n"));
  69   }
  70 }
  71 
  72 void CodeBlobToOopClosure::do_newly_marked_nmethod(nmethod* nm) {
  73   nm->oops_do(_cl, /*do_strong_roots_only=*/ true);
  74 }
  75 
  76 void CodeBlobToOopClosure::do_code_blob(CodeBlob* cb) {
  77   if (!_do_marking) {
  78     nmethod* nm = cb->as_nmethod_or_null();
  79     NOT_PRODUCT(if (TraceScavenge && Verbose && nm != NULL)  nm->print_on(tty, "oops_do, unmarked visit\n"));
  80     // This assert won't work, since there are lots of mini-passes
  81     // (mostly in debug mode) that co-exist with marking phases.
  82     //assert(!(cb->is_nmethod() && ((nmethod*)cb)->test_oops_do_mark()), "found marked nmethod during mark-free phase");
  83     if (nm != NULL) {
  84       nm->oops_do(_cl);
  85     }
  86   } else {
  87     MarkingCodeBlobClosure::do_code_blob(cb);
  88   }
  89 }
  90 
  91