1 /* 2 * Copyright (C) 2016 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 <dlfcn.h> 18 #include <iostream> 19 20 #include "base/casts.h" 21 #include "base/macros.h" 22 #include "java_vm_ext.h" 23 #include "jni_env_ext.h" 24 #include "thread-inl.h" 25 26 namespace art { 27 namespace { 28 29 static volatile std::atomic<bool> vm_was_shutdown(false); 30 Java_Main_waitAndCallIntoJniEnv(JNIEnv * env,jclass)31extern "C" JNIEXPORT void JNICALL Java_Main_waitAndCallIntoJniEnv(JNIEnv* env, jclass) { 32 // Wait until the runtime is shutdown. 33 while (!vm_was_shutdown.load()) { 34 usleep(1000); 35 } 36 std::cout << "About to call exception check\n"; 37 env->ExceptionCheck(); 38 LOG(ERROR) << "Should not be reached!"; 39 } 40 41 // NO_RETURN does not work with extern "C" for target builds. Java_Main_destroyJavaVMAndExit(JNIEnv * env,jclass)42extern "C" JNIEXPORT void JNICALL Java_Main_destroyJavaVMAndExit(JNIEnv* env, jclass) { 43 // Fake up the managed stack so we can detach. 44 Thread* const self = Thread::Current(); 45 self->SetTopOfStack(nullptr); 46 self->SetTopOfShadowStack(nullptr); 47 JavaVM* vm = down_cast<JNIEnvExt*>(env)->vm; 48 vm->DetachCurrentThread(); 49 // Open ourself again to make sure the native library does not get unloaded from 50 // underneath us due to DestroyJavaVM. b/28406866 51 void* handle = dlopen(kIsDebugBuild ? "libarttestd.so" : "libarttest.so", RTLD_NOW); 52 CHECK(handle != nullptr); 53 vm->DestroyJavaVM(); 54 vm_was_shutdown.store(true); 55 // Give threads some time to get stuck in ExceptionCheck. 56 usleep(1000000); 57 if (env != nullptr) { 58 // Use env != nullptr to trick noreturn. 59 exit(0); 60 } 61 } 62 63 } // namespace 64 } // namespace art 65