Andreas Gampe | cc13b22 | 2016-10-10 19:09:09 -0700 | [diff] [blame^] | 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 | #include "object_tagging.h" |
| 33 | |
| 34 | #include "art_jvmti.h" |
| 35 | #include "base/logging.h" |
| 36 | #include "events-inl.h" |
| 37 | #include "gc/allocation_listener.h" |
| 38 | #include "instrumentation.h" |
| 39 | #include "jni_env_ext-inl.h" |
| 40 | #include "mirror/class.h" |
| 41 | #include "mirror/object.h" |
| 42 | #include "runtime.h" |
| 43 | #include "ScopedLocalRef.h" |
| 44 | |
| 45 | namespace openjdkjvmti { |
| 46 | |
| 47 | void ObjectTagTable::Add(art::mirror::Object* obj, jlong tag) { |
| 48 | art::Thread* self = art::Thread::Current(); |
| 49 | art::MutexLock mu(self, allow_disallow_lock_); |
| 50 | Wait(self); |
| 51 | |
| 52 | if (first_free_ == tagged_objects_.size()) { |
| 53 | tagged_objects_.push_back(Entry(art::GcRoot<art::mirror::Object>(obj), tag)); |
| 54 | first_free_++; |
| 55 | } else { |
| 56 | DCHECK_LT(first_free_, tagged_objects_.size()); |
| 57 | DCHECK(tagged_objects_[first_free_].first.IsNull()); |
| 58 | tagged_objects_[first_free_] = Entry(art::GcRoot<art::mirror::Object>(obj), tag); |
| 59 | // TODO: scan for free elements. |
| 60 | first_free_ = tagged_objects_.size(); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | bool ObjectTagTable::Remove(art::mirror::Object* obj, jlong* tag) { |
| 65 | art::Thread* self = art::Thread::Current(); |
| 66 | art::MutexLock mu(self, allow_disallow_lock_); |
| 67 | Wait(self); |
| 68 | |
| 69 | for (auto it = tagged_objects_.begin(); it != tagged_objects_.end(); ++it) { |
| 70 | if (it->first.Read(nullptr) == obj) { |
| 71 | if (tag != nullptr) { |
| 72 | *tag = it->second; |
| 73 | } |
| 74 | it->first = art::GcRoot<art::mirror::Object>(nullptr); |
| 75 | |
| 76 | size_t index = it - tagged_objects_.begin(); |
| 77 | if (index < first_free_) { |
| 78 | first_free_ = index; |
| 79 | } |
| 80 | |
| 81 | // TODO: compaction. |
| 82 | |
| 83 | return true; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | return false; |
| 88 | } |
| 89 | |
| 90 | void ObjectTagTable::Sweep(art::IsMarkedVisitor* visitor) { |
| 91 | if (event_handler_->IsEventEnabledAnywhere(JVMTI_EVENT_OBJECT_FREE)) { |
| 92 | SweepImpl<true>(visitor); |
| 93 | } else { |
| 94 | SweepImpl<false>(visitor); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | template <bool kHandleNull> |
| 99 | void ObjectTagTable::SweepImpl(art::IsMarkedVisitor* visitor) { |
| 100 | art::Thread* self = art::Thread::Current(); |
| 101 | art::MutexLock mu(self, allow_disallow_lock_); |
| 102 | |
| 103 | for (auto it = tagged_objects_.begin(); it != tagged_objects_.end(); ++it) { |
| 104 | if (!it->first.IsNull()) { |
| 105 | art::mirror::Object* original_obj = it->first.Read<art::kWithoutReadBarrier>(); |
| 106 | art::mirror::Object* target_obj = visitor->IsMarked(original_obj); |
| 107 | if (original_obj != target_obj) { |
| 108 | it->first = art::GcRoot<art::mirror::Object>(target_obj); |
| 109 | |
| 110 | if (kHandleNull && target_obj == nullptr) { |
| 111 | HandleNullSweep(it->second); |
| 112 | } |
| 113 | } |
| 114 | } else { |
| 115 | size_t index = it - tagged_objects_.begin(); |
| 116 | if (index < first_free_) { |
| 117 | first_free_ = index; |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | void ObjectTagTable::HandleNullSweep(jlong tag) { |
| 124 | event_handler_->DispatchEvent(nullptr, JVMTI_EVENT_OBJECT_FREE, tag); |
| 125 | } |
| 126 | |
| 127 | } // namespace openjdkjvmti |