| /* |
| * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP |
| #define SHARE_VM_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "memory/iterator.hpp" |
| #include "oops/markOop.hpp" |
| #include "utilities/growableArray.hpp" |
| |
| template <typename T, typename Impl> |
| class SaveRestore { |
| private: |
| Impl _impl; |
| public: |
| SaveRestore() : _impl() { |
| _impl.setup(); |
| } |
| |
| void save(T const& value) { |
| _impl.save(value); |
| } |
| |
| ~SaveRestore() { |
| _impl.restore(); |
| } |
| }; |
| |
| template <typename T, typename Context> |
| class ContextStore { |
| private: |
| GrowableArray<Context>* _storage; |
| public: |
| ContextStore() : _storage(NULL) {} |
| |
| void setup() { |
| assert(_storage == NULL, "invariant"); |
| _storage = new GrowableArray<Context>(16); |
| } |
| |
| void save(T const& value) { |
| _storage->push(Context(value)); |
| } |
| |
| void restore() { |
| for (int i = 0; i < _storage->length(); ++i) { |
| _storage->at(i).~Context(); |
| } |
| } |
| }; |
| |
| /* |
| * This class will save the original mark oop of an object sample object. |
| * It will then install an "identifier" mark oop to be used for |
| * identification purposes in the search for reference chains. |
| * The destructor will restore the original mark oop. |
| */ |
| |
| class MarkOopContext { |
| private: |
| oop _obj; |
| markOop _mark_oop; |
| void swap(MarkOopContext& rhs); |
| public: |
| MarkOopContext(); |
| MarkOopContext(const oop obj); |
| MarkOopContext(const MarkOopContext& rhs); |
| void operator=(MarkOopContext rhs); |
| ~MarkOopContext(); |
| }; |
| |
| typedef SaveRestore<oop, ContextStore<oop, MarkOopContext> > SaveRestoreMarkOops; |
| |
| class ClassLoaderData; |
| |
| class CLDClaimContext { |
| private: |
| ClassLoaderData* _cld; |
| void swap(CLDClaimContext& rhs); |
| public: |
| CLDClaimContext(); |
| CLDClaimContext(ClassLoaderData* cld); |
| CLDClaimContext(const CLDClaimContext& rhs); |
| void operator=(CLDClaimContext rhs); |
| ~CLDClaimContext(); |
| }; |
| |
| typedef SaveRestore<ClassLoaderData*, ContextStore<ClassLoaderData*, CLDClaimContext> > SaveRestoreCLDClaimState; |
| |
| class CLDClaimStateClosure : public CLDClosure { |
| private: |
| SaveRestoreCLDClaimState _state; |
| public: |
| CLDClaimStateClosure(); |
| void do_cld(ClassLoaderData* cld); |
| }; |
| |
| class SaveRestoreCLDClaimBits : public StackObj { |
| private: |
| CLDClaimStateClosure _claim_state_closure; |
| public: |
| SaveRestoreCLDClaimBits(); |
| ~SaveRestoreCLDClaimBits(); |
| }; |
| |
| #endif // SHARE_VM_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP |