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 #ifndef SHARE_VM_JFR_LEAKPROFILER_LEAKPROFILER_HPP 26 #define SHARE_VM_JFR_LEAKPROFILER_LEAKPROFILER_HPP 27 28 #include "jfr/utilities/jfrTraceTime.hpp" 29 #include "memory/allocation.hpp" 30 31 class BoolObjectClosure; 32 class ObjectSampler; 33 class OopClosure; 34 class Thread; 35 36 class LeakProfiler : public AllStatic { 37 friend class ClassUnloadConstantSet; 38 friend class ConstantSet; 39 friend class ObjectSampleCheckpoint; 40 friend class StartOperation; 41 friend class StopOperation; 42 friend class EmitEventOperation; 43 friend class WriteObjectSampleStacktrace; 44 45 private: 46 static ObjectSampler* _object_sampler; 47 static JfrTraceTime _last_sweep; 48 49 static void set_object_sampler(ObjectSampler* object_sampler); 50 static ObjectSampler* object_sampler(); 51 52 static void suspend(); 53 static void resume(); 54 static bool is_suspended(); 55 56 public: 57 static bool start(jint sample_count); 58 static bool stop(); 59 static void emit_events(jlong cutoff_ticks, bool emit_all); 60 static bool is_running(); 61 62 static void sample(HeapWord* object, size_t size, JavaThread* thread); 63 64 // Called by GC 65 static void oops_do(BoolObjectClosure* is_alive, OopClosure* f); 66 }; 67 68 #endif // SHARE_VM_JFR_LEAKPROFILER_LEAKPROFILER_HPP