1 /* 2 * Copyright (c) 2014, 2018, 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 "classfile/classLoaderData.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "jfr/leakprofiler/chains/bfsClosure.hpp" 29 #include "jfr/leakprofiler/chains/dfsClosure.hpp" 30 #include "jfr/leakprofiler/chains/edgeQueue.hpp" 31 #include "jfr/leakprofiler/chains/rootSetClosure.hpp" 32 #include "jfr/leakprofiler/utilities/saveRestore.hpp" 33 #include "jfr/leakprofiler/utilities/unifiedOop.hpp" 34 #include "memory/universe.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "runtime/jniHandles.hpp" 38 #include "runtime/synchronizer.hpp" 39 #include "runtime/thread.hpp" 40 #include "services/management.hpp" 41 #include "utilities/align.hpp" 42 43 template <typename Delegate> 44 RootSetClosure<Delegate>::RootSetClosure(Delegate* delegate) : _delegate(delegate) {} 45 46 template <typename Delegate> 47 void RootSetClosure<Delegate>::do_oop(oop* ref) { 48 assert(ref != NULL, "invariant"); 49 // We discard unaligned root references because 50 // our reference tagging scheme will use 51 // the lowest bit in a represented reference 52 // to indicate the reference is narrow. 53 // It is mainly roots delivered via nmethods::do_oops() 54 // that come in unaligned. It should be ok to duck these 55 // since they are supposedly weak. 56 if (!is_aligned(ref, HeapWordSize)) { 57 return; 58 } 59 60 assert(is_aligned(ref, HeapWordSize), "invariant"); 61 if (*ref != NULL) { 62 _delegate->do_root(ref); 63 } 64 } 65 66 template <typename Delegate> 67 void RootSetClosure<Delegate>::do_oop(narrowOop* ref) { 68 assert(ref != NULL, "invariant"); 69 assert(is_aligned(ref, sizeof(narrowOop)), "invariant"); 70 const oop pointee = oopDesc::load_decode_heap_oop(ref); 71 if (pointee != NULL) { 72 _delegate->do_root(UnifiedOop::encode(ref)); 73 } 74 } 75 76 class RootSetClosureMarkScope : public MarkingCodeBlobClosure::MarkScope {}; 77 78 template <typename Delegate> 79 void RootSetClosure<Delegate>::process() { 80 RootSetClosureMarkScope mark_scope; 81 CLDToOopClosure cldt_closure(this); 82 ClassLoaderDataGraph::always_strong_cld_do(&cldt_closure); 83 CodeBlobToOopClosure blobs(this, false); 84 Threads::oops_do(this, NULL, &blobs); // XXX set CLDClosure to NULL 85 ObjectSynchronizer::oops_do(this); 86 Universe::oops_do(this); 87 JNIHandles::oops_do(this); 88 JvmtiExport::oops_do(this); 89 SystemDictionary::oops_do(this); 90 Management::oops_do(this); 91 StringTable::oops_do(this); 92 } 93 94 template class RootSetClosure<BFSClosure>; 95 template class RootSetClosure<DFSClosure>;