1 /* Copyright (C) 2016 The Android Open Source Project 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This file implements interfaces from the file jvmti.h. This implementation 5 * is licensed under the same terms as the file jvmti.h. The 6 * copyright and license information for the file jvmti.h follows. 7 * 8 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. 9 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 10 * 11 * This code is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License version 2 only, as 13 * published by the Free Software Foundation. Oracle designates this 14 * particular file as subject to the "Classpath" exception as provided 15 * by Oracle in the LICENSE file that accompanied this code. 16 * 17 * This code is distributed in the hope that it will be useful, but WITHOUT 18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 20 * version 2 for more details (a copy is included in the LICENSE file that 21 * accompanied this code). 22 * 23 * You should have received a copy of the GNU General Public License version 24 * 2 along with this work; if not, write to the Free Software Foundation, 25 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 26 * 27 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 28 * or visit www.oracle.com if you need additional information or have any 29 * questions. 30 */ 31 32 #ifndef ART_OPENJDKJVMTI_OBJECT_TAGGING_H_ 33 #define ART_OPENJDKJVMTI_OBJECT_TAGGING_H_ 34 35 #include <unordered_map> 36 37 #include "base/globals.h" 38 #include "base/mutex.h" 39 #include "jvmti.h" 40 #include "jvmti_weak_table.h" 41 #include "mirror/object.h" 42 43 namespace openjdkjvmti { 44 45 struct ArtJvmTiEnv; 46 class EventHandler; 47 48 class ObjectTagTable final : public JvmtiWeakTable<jlong> { 49 public: ObjectTagTable(EventHandler * event_handler,ArtJvmTiEnv * env)50 ObjectTagTable(EventHandler* event_handler, ArtJvmTiEnv* env) 51 : lock_("Object tag table lock", art::LockLevel::kGenericBottomLock), 52 event_handler_(event_handler), 53 jvmti_env_(env) {} 54 55 // Denotes that weak-refs are visible on all threads. Used by semi-space. 56 void Allow() override 57 REQUIRES_SHARED(art::Locks::mutator_lock_) 58 REQUIRES(!allow_disallow_lock_); 59 // Used by cms and the checkpoint system. 60 void Broadcast(bool broadcast_for_checkpoint) override 61 REQUIRES_SHARED(art::Locks::mutator_lock_) 62 REQUIRES(!allow_disallow_lock_); 63 64 bool Set(art::ObjPtr<art::mirror::Object> obj, jlong tag) override 65 REQUIRES_SHARED(art::Locks::mutator_lock_) 66 REQUIRES(!allow_disallow_lock_); 67 bool SetLocked(art::ObjPtr<art::mirror::Object> obj, jlong tag) override 68 REQUIRES_SHARED(art::Locks::mutator_lock_) 69 REQUIRES(allow_disallow_lock_); 70 GetTagOrZero(art::ObjPtr<art::mirror::Object> obj)71 jlong GetTagOrZero(art::ObjPtr<art::mirror::Object> obj) 72 REQUIRES_SHARED(art::Locks::mutator_lock_) 73 REQUIRES(!allow_disallow_lock_) { 74 jlong tmp = 0; 75 GetTag(obj, &tmp); 76 return tmp; 77 } GetTagOrZeroLocked(art::ObjPtr<art::mirror::Object> obj)78 jlong GetTagOrZeroLocked(art::ObjPtr<art::mirror::Object> obj) 79 REQUIRES_SHARED(art::Locks::mutator_lock_) 80 REQUIRES(allow_disallow_lock_) { 81 jlong tmp = 0; 82 GetTagLocked(obj, &tmp); 83 return tmp; 84 } 85 86 protected: 87 bool DoesHandleNullOnSweep() override; 88 void HandleNullSweep(jlong tag) override; 89 90 private: 91 void SendDelayedFreeEvents() 92 REQUIRES_SHARED(art::Locks::mutator_lock_) 93 REQUIRES(!allow_disallow_lock_); 94 95 void SendSingleFreeEvent(jlong tag) 96 REQUIRES_SHARED(art::Locks::mutator_lock_) 97 REQUIRES(!allow_disallow_lock_, !lock_); 98 99 art::Mutex lock_ BOTTOM_MUTEX_ACQUIRED_AFTER; 100 std::vector<jlong> null_tags_ GUARDED_BY(lock_); 101 EventHandler* event_handler_; 102 ArtJvmTiEnv* jvmti_env_; 103 }; 104 105 } // namespace openjdkjvmti 106 107 #endif // ART_OPENJDKJVMTI_OBJECT_TAGGING_H_ 108