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97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
/*
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* Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP
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#define SHARE_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP
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#include "jfr/leakprofiler/chains/jfrbitset.hpp"
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#include "jfr/leakprofiler/utilities/unifiedOopRef.hpp"
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#include "memory/iterator.hpp"
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#include "nmt/memTag.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/stack.inline.hpp"
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class Edge;
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class EdgeStore;
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class EdgeQueue;
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// Class responsible for iterating the heap depth-first
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class DFSClosure : public BasicOopIterateClosure {
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private:
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static const size_t max_dfs_depth = 3200;
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static UnifiedOopRef _reference_stack[max_dfs_depth];
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EdgeStore* _edge_store;
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JFRBitSet* _mark_bits;
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const Edge*_start_edge;
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size_t _max_depth;
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bool _ignore_root_set;
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DFSClosure(EdgeStore* edge_store, JFRBitSet* mark_bits, const Edge* start_edge);
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~DFSClosure();
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void add_chain();
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struct ProbeStackItem { // 16 bytes
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UnifiedOopRef r;
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unsigned depth;
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int chunkindex; // only used if objArrayOop
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};
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Stack<ProbeStackItem, mtTracing> _probe_stack;
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// Walkstate
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UnifiedOopRef _current_ref;
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oop _current_pointee;
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size_t _current_depth;
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int _current_chunkindex;
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uint64_t _num_objects_processed;
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uint64_t _num_sampled_objects_found;
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bool pointee_was_visited(const oop pointee) const { return _mark_bits->is_marked(pointee); }
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void mark_pointee_as_visited(const oop pointee) { _mark_bits->mark_obj(pointee); }
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bool pointee_was_sampled(const oop pointee) const { return pointee->mark().is_marked(); }
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void probe_stack_push_followup_chunk(UnifiedOopRef ref, oop pointee, size_t depth, int chunkindex);
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void probe_stack_push(UnifiedOopRef ref, oop pointee, size_t depth);
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bool probe_stack_pop();
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void drain_probe_stack();
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void handle_oop();
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void handle_objarrayoop();
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void log(const char* msg, ...) DEBUG_ONLY(;) NOT_DEBUG({})
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void log_reference_stack() DEBUG_ONLY(;) NOT_DEBUG({})
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public:
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virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS_EXCEPT_REFERENT; }
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static void find_leaks_from_edge(EdgeStore* edge_store, JFRBitSet* mark_bits, const Edge* start_edge);
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static void find_leaks_from_root_set(EdgeStore* edge_store, JFRBitSet* mark_bits);
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void do_root(UnifiedOopRef ref);
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virtual void do_oop(oop* ref);
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virtual void do_oop(narrowOop* ref);
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};
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#endif // SHARE_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP
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