1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdio.h> 18 19 #include <mutex> 20 #include <string> 21 #include <vector> 22 23 #include "android-base/logging.h" 24 #include "android-base/stringprintf.h" 25 #include "jni.h" 26 #include "jvmti.h" 27 #include "scoped_local_ref.h" 28 29 // Test infrastructure 30 #include "jni_helper.h" 31 #include "jvmti_helper.h" 32 #include "test_env.h" 33 #include "ti_macros.h" 34 35 namespace art { 36 namespace Test924Threads { 37 38 // private static native Thread getCurrentThread(); 39 // private static native Object[] getThreadInfo(Thread t); 40 41 extern "C" JNIEXPORT jthread JNICALL Java_art_Test924_getCurrentThread( 42 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED) { 43 jthread thread = nullptr; 44 jvmtiError result = jvmti_env->GetCurrentThread(&thread); 45 if (JvmtiErrorToException(env, jvmti_env, result)) { 46 return nullptr; 47 } 48 return thread; 49 } 50 51 extern "C" JNIEXPORT jobjectArray JNICALL Java_art_Test924_getThreadInfo( 52 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jthread thread) { 53 jvmtiThreadInfo info; 54 memset(&info, 0, sizeof(jvmtiThreadInfo)); 55 56 jvmtiError result = jvmti_env->GetThreadInfo(thread, &info); 57 if (JvmtiErrorToException(env, jvmti_env, result)) { 58 return nullptr; 59 } 60 61 auto callback = [&](jint component_index) -> jobject { 62 switch (component_index) { 63 // The name. 64 case 0: 65 return (info.name == nullptr) ? nullptr : env->NewStringUTF(info.name); 66 67 // The priority. Use a string for simplicity of construction. 68 case 1: 69 return env->NewStringUTF(android::base::StringPrintf("%d", info.priority).c_str()); 70 71 // Whether it's a daemon. Use a string for simplicity of construction. 72 case 2: 73 return env->NewStringUTF(info.is_daemon == JNI_TRUE ? "true" : "false"); 74 75 // The thread group; 76 case 3: 77 return env->NewLocalRef(info.thread_group); 78 79 // The context classloader. 80 case 4: 81 return env->NewLocalRef(info.context_class_loader); 82 } 83 LOG(FATAL) << "Should not reach here"; 84 UNREACHABLE(); 85 }; 86 jobjectArray ret = CreateObjectArray(env, 5, "java/lang/Object", callback); 87 88 jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(info.name)); 89 if (info.thread_group != nullptr) { 90 env->DeleteLocalRef(info.thread_group); 91 } 92 if (info.context_class_loader != nullptr) { 93 env->DeleteLocalRef(info.context_class_loader); 94 } 95 96 return ret; 97 } 98 99 extern "C" JNIEXPORT jint JNICALL Java_art_Test924_getThreadState( 100 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jthread thread) { 101 jint state; 102 jvmtiError result = jvmti_env->GetThreadState(thread, &state); 103 if (JvmtiErrorToException(env, jvmti_env, result)) { 104 return 0; 105 } 106 return state; 107 } 108 109 extern "C" JNIEXPORT jobjectArray JNICALL Java_art_Test924_getAllThreads( 110 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED) { 111 jint thread_count; 112 jthread* threads; 113 114 jvmtiError result = jvmti_env->GetAllThreads(&thread_count, &threads); 115 if (JvmtiErrorToException(env, jvmti_env, result)) { 116 return nullptr; 117 } 118 119 auto callback = [&](jint index) { 120 return threads[index]; 121 }; 122 jobjectArray ret = CreateObjectArray(env, thread_count, "java/lang/Thread", callback); 123 124 jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(threads)); 125 126 return ret; 127 } 128 129 extern "C" JNIEXPORT jlong JNICALL Java_art_Test924_getTLS( 130 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jthread thread) { 131 void* tls; 132 jvmtiError result = jvmti_env->GetThreadLocalStorage(thread, &tls); 133 if (JvmtiErrorToException(env, jvmti_env, result)) { 134 return 0; 135 } 136 return static_cast<jlong>(reinterpret_cast<uintptr_t>(tls)); 137 } 138 139 extern "C" JNIEXPORT void JNICALL Java_art_Test924_setTLS( 140 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jthread thread, jlong val) { 141 const void* tls = reinterpret_cast<void*>(static_cast<uintptr_t>(val)); 142 jvmtiError result = jvmti_env->SetThreadLocalStorage(thread, tls); 143 JvmtiErrorToException(env, jvmti_env, result); 144 } 145 146 static std::mutex gEventsMutex; 147 static std::vector<std::string> gEvents; 148 149 static void JNICALL ThreadEvent(jvmtiEnv* jvmti_env, 150 JNIEnv* jni_env, 151 jthread thread, 152 bool is_start) { 153 jvmtiThreadInfo info; 154 { 155 std::lock_guard<std::mutex> guard(gEventsMutex); 156 157 jvmtiError result = jvmti_env->GetThreadInfo(thread, &info); 158 if (result != JVMTI_ERROR_NONE) { 159 gEvents.push_back("Error getting thread info"); 160 return; 161 } 162 163 gEvents.push_back(android::base::StringPrintf("Thread(%s): %s", 164 info.name, 165 is_start ? "start" : "end")); 166 } 167 168 jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(info.name)); 169 jni_env->DeleteLocalRef(info.thread_group); 170 jni_env->DeleteLocalRef(info.context_class_loader); 171 } 172 173 static void JNICALL ThreadStart(jvmtiEnv* jvmti_env, 174 JNIEnv* jni_env, 175 jthread thread) { 176 ThreadEvent(jvmti_env, jni_env, thread, true); 177 } 178 179 static void JNICALL ThreadEnd(jvmtiEnv* jvmti_env, 180 JNIEnv* jni_env, 181 jthread thread) { 182 ThreadEvent(jvmti_env, jni_env, thread, false); 183 } 184 185 extern "C" JNIEXPORT void JNICALL Java_art_Test924_enableThreadEvents( 186 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jboolean b) { 187 if (b == JNI_FALSE) { 188 jvmtiError ret = jvmti_env->SetEventNotificationMode(JVMTI_DISABLE, 189 JVMTI_EVENT_THREAD_START, 190 nullptr); 191 if (JvmtiErrorToException(env, jvmti_env, ret)) { 192 return; 193 } 194 ret = jvmti_env->SetEventNotificationMode(JVMTI_DISABLE, 195 JVMTI_EVENT_THREAD_END, 196 nullptr); 197 JvmtiErrorToException(env, jvmti_env, ret); 198 return; 199 } 200 201 jvmtiEventCallbacks callbacks; 202 memset(&callbacks, 0, sizeof(jvmtiEventCallbacks)); 203 callbacks.ThreadStart = ThreadStart; 204 callbacks.ThreadEnd = ThreadEnd; 205 jvmtiError ret = jvmti_env->SetEventCallbacks(&callbacks, sizeof(callbacks)); 206 if (JvmtiErrorToException(env, jvmti_env, ret)) { 207 return; 208 } 209 210 ret = jvmti_env->SetEventNotificationMode(JVMTI_ENABLE, 211 JVMTI_EVENT_THREAD_START, 212 nullptr); 213 if (JvmtiErrorToException(env, jvmti_env, ret)) { 214 return; 215 } 216 ret = jvmti_env->SetEventNotificationMode(JVMTI_ENABLE, 217 JVMTI_EVENT_THREAD_END, 218 nullptr); 219 JvmtiErrorToException(env, jvmti_env, ret); 220 } 221 222 extern "C" JNIEXPORT jobjectArray JNICALL Java_art_Test924_getThreadEventMessages( 223 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED) { 224 std::lock_guard<std::mutex> guard(gEventsMutex); 225 jobjectArray ret = CreateObjectArray(env, 226 static_cast<jint>(gEvents.size()), 227 "java/lang/String", 228 [&](jint i) { 229 return env->NewStringUTF(gEvents[i].c_str()); 230 }); 231 gEvents.clear(); 232 return ret; 233 } 234 235 } // namespace Test924Threads 236 } // namespace art 237
