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