1 /* Copyright (C) 2017 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 "ti_object.h"
33
34 #include "art_jvmti.h"
35 #include "mirror/object-inl.h"
36 #include "scoped_thread_state_change-inl.h"
37 #include "thread-current-inl.h"
38 #include "thread_list.h"
39 #include "ti_thread.h"
40
41 namespace openjdkjvmti {
42
GetObjectSize(jvmtiEnv * env ATTRIBUTE_UNUSED,jobject jobject,jlong * size_ptr)43 jvmtiError ObjectUtil::GetObjectSize(jvmtiEnv* env ATTRIBUTE_UNUSED,
44 jobject jobject,
45 jlong* size_ptr) {
46 if (jobject == nullptr) {
47 return ERR(INVALID_OBJECT);
48 }
49 if (size_ptr == nullptr) {
50 return ERR(NULL_POINTER);
51 }
52
53 art::ScopedObjectAccess soa(art::Thread::Current());
54 art::ObjPtr<art::mirror::Object> object = soa.Decode<art::mirror::Object>(jobject);
55
56 *size_ptr = object->SizeOf();
57 return ERR(NONE);
58 }
59
GetObjectHashCode(jvmtiEnv * env ATTRIBUTE_UNUSED,jobject jobject,jint * hash_code_ptr)60 jvmtiError ObjectUtil::GetObjectHashCode(jvmtiEnv* env ATTRIBUTE_UNUSED,
61 jobject jobject,
62 jint* hash_code_ptr) {
63 if (jobject == nullptr) {
64 return ERR(INVALID_OBJECT);
65 }
66 if (hash_code_ptr == nullptr) {
67 return ERR(NULL_POINTER);
68 }
69
70 art::ScopedObjectAccess soa(art::Thread::Current());
71 art::ObjPtr<art::mirror::Object> object = soa.Decode<art::mirror::Object>(jobject);
72
73 *hash_code_ptr = object->IdentityHashCode();
74
75 return ERR(NONE);
76 }
77
GetObjectMonitorUsage(jvmtiEnv * baseenv,jobject obj,jvmtiMonitorUsage * usage)78 jvmtiError ObjectUtil::GetObjectMonitorUsage(
79 jvmtiEnv* baseenv, jobject obj, jvmtiMonitorUsage* usage) {
80 ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(baseenv);
81 if (obj == nullptr) {
82 return ERR(INVALID_OBJECT);
83 }
84 if (usage == nullptr) {
85 return ERR(NULL_POINTER);
86 }
87 art::Thread* self = art::Thread::Current();
88 ThreadUtil::SuspendCheck(self);
89 art::JNIEnvExt* jni = self->GetJniEnv();
90 std::vector<jthread> wait;
91 std::vector<jthread> notify_wait;
92 {
93 art::ScopedObjectAccess soa(self); // Now we know we have the shared lock.
94 art::ScopedThreadSuspension sts(self, art::ThreadState::kNative);
95 art::ScopedSuspendAll ssa("GetObjectMonitorUsage", /*long_suspend=*/false);
96 art::ObjPtr<art::mirror::Object> target(self->DecodeJObject(obj));
97 // This gets the list of threads trying to lock or wait on the monitor.
98 art::MonitorInfo info(target.Ptr());
99 usage->owner = info.owner_ != nullptr ?
100 jni->AddLocalReference<jthread>(info.owner_->GetPeerFromOtherThread()) : nullptr;
101 usage->entry_count = info.entry_count_;
102 for (art::Thread* thd : info.waiters_) {
103 // RI seems to consider waiting for notify to be included in those waiting to acquire the
104 // monitor. We will match this behavior.
105 notify_wait.push_back(jni->AddLocalReference<jthread>(thd->GetPeerFromOtherThread()));
106 wait.push_back(jni->AddLocalReference<jthread>(thd->GetPeerFromOtherThread()));
107 }
108 {
109 // Scan all threads to see which are waiting on this particular monitor.
110 art::MutexLock tll(self, *art::Locks::thread_list_lock_);
111 for (art::Thread* thd : art::Runtime::Current()->GetThreadList()->GetList()) {
112 if (thd != info.owner_ && target.Ptr() == thd->GetMonitorEnterObject()) {
113 wait.push_back(jni->AddLocalReference<jthread>(thd->GetPeerFromOtherThread()));
114 }
115 }
116 }
117 }
118 usage->waiter_count = wait.size();
119 usage->notify_waiter_count = notify_wait.size();
120 jvmtiError ret = CopyDataIntoJvmtiBuffer(env,
121 reinterpret_cast<const unsigned char*>(wait.data()),
122 wait.size() * sizeof(jthread),
123 reinterpret_cast<unsigned char**>(&usage->waiters));
124 if (ret != OK) {
125 return ret;
126 }
127 return CopyDataIntoJvmtiBuffer(env,
128 reinterpret_cast<const unsigned char*>(notify_wait.data()),
129 notify_wait.size() * sizeof(jthread),
130 reinterpret_cast<unsigned char**>(&usage->notify_waiters));
131 }
132
133 } // namespace openjdkjvmti
134