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_phase.h"
33
34 #include "art_jvmti.h"
35 #include "base/macros.h"
36 #include "events-inl.h"
37 #include "nativehelper/scoped_local_ref.h"
38 #include "runtime.h"
39 #include "runtime_callbacks.h"
40 #include "scoped_thread_state_change-inl.h"
41 #include "thread-current-inl.h"
42 #include "thread_list.h"
43 #include "ti_thread.h"
44
45 namespace openjdkjvmti {
46
47 jvmtiPhase PhaseUtil::current_phase_ = static_cast<jvmtiPhase>(0);
48
49 struct PhaseUtil::PhaseCallback : public art::RuntimePhaseCallback {
GetJniEnvopenjdkjvmti::PhaseUtil::PhaseCallback50 inline static JNIEnv* GetJniEnv() {
51 return reinterpret_cast<JNIEnv*>(art::Thread::Current()->GetJniEnv());
52 }
53
GetCurrentJThreadopenjdkjvmti::PhaseUtil::PhaseCallback54 inline static jthread GetCurrentJThread() {
55 art::ScopedObjectAccess soa(art::Thread::Current());
56 return soa.AddLocalReference<jthread>(soa.Self()->GetPeer());
57 }
58
NextRuntimePhaseopenjdkjvmti::PhaseUtil::PhaseCallback59 void NextRuntimePhase(RuntimePhase phase) REQUIRES_SHARED(art::Locks::mutator_lock_) override {
60 art::Thread* self = art::Thread::Current();
61 switch (phase) {
62 case RuntimePhase::kInitialAgents:
63 PhaseUtil::current_phase_ = JVMTI_PHASE_PRIMORDIAL;
64 break;
65 case RuntimePhase::kStart:
66 {
67 PhaseUtil::current_phase_ = JVMTI_PHASE_START;
68 event_handler->DispatchEvent<ArtJvmtiEvent::kVmStart>(self, GetJniEnv());
69 }
70 break;
71 case RuntimePhase::kInit:
72 {
73 ThreadUtil::CacheData();
74 PhaseUtil::current_phase_ = JVMTI_PHASE_LIVE;
75 {
76 ScopedLocalRef<jthread> thread(GetJniEnv(), GetCurrentJThread());
77 event_handler->DispatchEvent<ArtJvmtiEvent::kVmInit>(self, GetJniEnv(), thread.get());
78 }
79 // We need to have these events be ordered to match behavior expected by some real-world
80 // agents. The spec does not really require this but compatibility is a useful property to
81 // maintain.
82 ThreadUtil::VMInitEventSent();
83 }
84 break;
85 case RuntimePhase::kDeath:
86 {
87 event_handler->DispatchEvent<ArtJvmtiEvent::kVmDeath>(self, GetJniEnv());
88 PhaseUtil::current_phase_ = JVMTI_PHASE_DEAD;
89 }
90 // TODO: Block events now.
91 break;
92 }
93 }
94
95 EventHandler* event_handler = nullptr;
96 };
97
98 PhaseUtil::PhaseCallback gPhaseCallback;
99
GetPhase(jvmtiEnv * env ATTRIBUTE_UNUSED,jvmtiPhase * phase_ptr)100 jvmtiError PhaseUtil::GetPhase(jvmtiEnv* env ATTRIBUTE_UNUSED, jvmtiPhase* phase_ptr) {
101 if (phase_ptr == nullptr) {
102 return ERR(NULL_POINTER);
103 }
104 jvmtiPhase now = PhaseUtil::current_phase_;
105 DCHECK(now == JVMTI_PHASE_ONLOAD ||
106 now == JVMTI_PHASE_PRIMORDIAL ||
107 now == JVMTI_PHASE_START ||
108 now == JVMTI_PHASE_LIVE ||
109 now == JVMTI_PHASE_DEAD);
110 *phase_ptr = now;
111 return ERR(NONE);
112 }
113
IsLivePhase()114 bool PhaseUtil::IsLivePhase() {
115 jvmtiPhase now = PhaseUtil::current_phase_;
116 DCHECK(now == JVMTI_PHASE_ONLOAD ||
117 now == JVMTI_PHASE_PRIMORDIAL ||
118 now == JVMTI_PHASE_START ||
119 now == JVMTI_PHASE_LIVE ||
120 now == JVMTI_PHASE_DEAD);
121 return now == JVMTI_PHASE_LIVE;
122 }
123
SetToOnLoad()124 void PhaseUtil::SetToOnLoad() {
125 DCHECK_EQ(0u, static_cast<size_t>(PhaseUtil::current_phase_));
126 PhaseUtil::current_phase_ = JVMTI_PHASE_ONLOAD;
127 }
128
SetToPrimordial()129 void PhaseUtil::SetToPrimordial() {
130 DCHECK_EQ(static_cast<size_t>(JVMTI_PHASE_ONLOAD), static_cast<size_t>(PhaseUtil::current_phase_));
131 PhaseUtil::current_phase_ = JVMTI_PHASE_ONLOAD;
132 }
133
SetToLive()134 void PhaseUtil::SetToLive() {
135 DCHECK_EQ(static_cast<size_t>(0), static_cast<size_t>(PhaseUtil::current_phase_));
136 ThreadUtil::CacheData();
137 PhaseUtil::current_phase_ = JVMTI_PHASE_LIVE;
138 }
139
Register(EventHandler * handler)140 void PhaseUtil::Register(EventHandler* handler) {
141 gPhaseCallback.event_handler = handler;
142 art::ScopedThreadStateChange stsc(art::Thread::Current(),
143 art::ThreadState::kWaitingForDebuggerToAttach);
144 art::ScopedSuspendAll ssa("Add phase callback");
145 art::Runtime::Current()->GetRuntimeCallbacks()->AddRuntimePhaseCallback(&gPhaseCallback);
146 }
147
Unregister()148 void PhaseUtil::Unregister() {
149 art::ScopedThreadStateChange stsc(art::Thread::Current(),
150 art::ThreadState::kWaitingForDebuggerToAttach);
151 art::ScopedSuspendAll ssa("Remove phase callback");
152 art::Runtime::Current()->GetRuntimeCallbacks()->RemoveRuntimePhaseCallback(&gPhaseCallback);
153 }
154
GetPhaseUnchecked()155 jvmtiPhase PhaseUtil::GetPhaseUnchecked() {
156 return PhaseUtil::current_phase_;
157 }
158
159 } // namespace openjdkjvmti
160