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_jni.h" 33 34 #include "jni.h" 35 36 #include "art_jvmti.h" 37 #include "base/mutex.h" 38 #include "java_vm_ext.h" 39 #include "jni_env_ext.h" 40 #include "runtime.h" 41 #include "thread-current-inl.h" 42 43 namespace openjdkjvmti { 44 45 jvmtiError JNIUtil::SetJNIFunctionTable(jvmtiEnv* env ATTRIBUTE_UNUSED, 46 const jniNativeInterface* function_table) { 47 // While we supporting setting null (which will reset the table), the spec says no. 48 if (function_table == nullptr) { 49 return ERR(NULL_POINTER); 50 } 51 52 art::JNIEnvExt::SetTableOverride(function_table); 53 return ERR(NONE); 54 } 55 56 jvmtiError JNIUtil::GetJNIFunctionTable(jvmtiEnv* env, jniNativeInterface** function_table) { 57 if (function_table == nullptr) { 58 return ERR(NULL_POINTER); 59 } 60 61 // We use the generic JNIEnvExt::GetFunctionTable instead of querying a specific JNIEnv, as 62 // this has to work in the start phase. 63 64 // Figure out which table is current. Conservatively assume check-jni is off. 65 bool check_jni = false; 66 art::Runtime* runtime = art::Runtime::Current(); 67 if (runtime != nullptr && runtime->GetJavaVM() != nullptr) { 68 check_jni = runtime->GetJavaVM()->IsCheckJniEnabled(); 69 } 70 71 // Get that table. 72 const JNINativeInterface* current_table; 73 { 74 art::MutexLock mu(art::Thread::Current(), *art::Locks::jni_function_table_lock_); 75 current_table = art::JNIEnvExt::GetFunctionTable(check_jni); 76 } 77 78 // Allocate memory and copy the table. 79 unsigned char* data; 80 jvmtiError data_result = env->Allocate(sizeof(JNINativeInterface), &data); 81 if (data_result != ERR(NONE)) { 82 return data_result; 83 } 84 memcpy(data, current_table, sizeof(JNINativeInterface)); 85 86 *function_table = reinterpret_cast<JNINativeInterface*>(data); 87 88 return ERR(NONE); 89 } 90 91 } // namespace openjdkjvmti 92
