1/*
2 * Copyright (c) 2014, 2019, 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 "aot/aotLoader.hpp"
27#include "classfile/classLoaderDataGraph.hpp"
28#include "classfile/stringTable.hpp"
29#include "classfile/systemDictionary.hpp"
30#include "gc/shared/strongRootsScope.hpp"
31#include "jfr/leakprofiler/chains/bfsClosure.hpp"
32#include "jfr/leakprofiler/chains/dfsClosure.hpp"
33#include "jfr/leakprofiler/chains/edgeQueue.hpp"
34#include "jfr/leakprofiler/chains/rootSetClosure.hpp"
35#include "jfr/leakprofiler/utilities/unifiedOop.hpp"
36#include "memory/universe.hpp"
37#include "oops/access.inline.hpp"
38#include "oops/oop.inline.hpp"
39#include "prims/jvmtiExport.hpp"
40#include "runtime/jniHandles.inline.hpp"
41#include "runtime/synchronizer.hpp"
42#include "runtime/thread.hpp"
43#include "services/management.hpp"
44#include "utilities/align.hpp"
45#if INCLUDE_JVMCI
46#include "jvmci/jvmci.hpp"
47#endif
48
49template <typename Delegate>
50RootSetClosure<Delegate>::RootSetClosure(Delegate* delegate) : _delegate(delegate) {}
51
52template <typename Delegate>
53void RootSetClosure<Delegate>::do_oop(oop* ref) {
54 assert(ref != NULL, "invariant");
55 // We discard unaligned root references because
56 // our reference tagging scheme will use
57 // the lowest bit in a represented reference
58 // to indicate the reference is narrow.
59 // It is mainly roots delivered via nmethods::do_oops()
60 // that come in unaligned. It should be ok to duck these
61 // since they are supposedly weak.
62 if (!is_aligned(ref, HeapWordSize)) {
63 return;
64 }
65
66 assert(is_aligned(ref, HeapWordSize), "invariant");
67 if (*ref != NULL) {
68 _delegate->do_root(ref);
69 }
70}
71
72template <typename Delegate>
73void RootSetClosure<Delegate>::do_oop(narrowOop* ref) {
74 assert(ref != NULL, "invariant");
75 assert(is_aligned(ref, sizeof(narrowOop)), "invariant");
76 const oop pointee = RawAccess<>::oop_load(ref);
77 if (pointee != NULL) {
78 _delegate->do_root(UnifiedOop::encode(ref));
79 }
80}
81
82class RootSetClosureMarkScope : public MarkScope {};
83
84template <typename Delegate>
85void RootSetClosure<Delegate>::process() {
86 RootSetClosureMarkScope mark_scope;
87 CLDToOopClosure cldt_closure(this, ClassLoaderData::_claim_none);
88 ClassLoaderDataGraph::always_strong_cld_do(&cldt_closure);
89 CodeBlobToOopClosure blobs(this, false);
90 Threads::oops_do(this, &blobs);
91 ObjectSynchronizer::oops_do(this);
92 Universe::oops_do(this);
93 JNIHandles::oops_do(this);
94 JvmtiExport::oops_do(this);
95 SystemDictionary::oops_do(this);
96 Management::oops_do(this);
97 StringTable::oops_do(this);
98 AOTLoader::oops_do(this);
99 JVMCI_ONLY(JVMCI::oops_do(this);)
100}
101
102template class RootSetClosure<BFSClosure>;
103template class RootSetClosure<DFSClosure>;
104