/* Copyright (C) 2017 The Android Open Source Project
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This file implements interfaces from the file jvmti.h. This implementation
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* is licensed under the same terms as the file jvmti.h. The
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* copyright and license information for the file jvmti.h follows.
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*
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "ti_jni.h"
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#include "jni.h"
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#include "art_jvmti.h"
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#include "base/mutex.h"
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#include "jni/java_vm_ext.h"
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#include "jni/jni_env_ext.h"
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#include "runtime.h"
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#include "thread-current-inl.h"
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namespace openjdkjvmti {
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jvmtiError JNIUtil::SetJNIFunctionTable(jvmtiEnv* env ATTRIBUTE_UNUSED,
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const jniNativeInterface* function_table) {
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// While we supporting setting null (which will reset the table), the spec says no.
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if (function_table == nullptr) {
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return ERR(NULL_POINTER);
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}
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art::JNIEnvExt::SetTableOverride(function_table);
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return ERR(NONE);
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}
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jvmtiError JNIUtil::GetJNIFunctionTable(jvmtiEnv* env, jniNativeInterface** function_table) {
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if (function_table == nullptr) {
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return ERR(NULL_POINTER);
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}
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// We use the generic JNIEnvExt::GetFunctionTable instead of querying a specific JNIEnv, as
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// this has to work in the start phase.
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// Figure out which table is current. Conservatively assume check-jni is off.
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bool check_jni = false;
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art::Runtime* runtime = art::Runtime::Current();
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if (runtime != nullptr && runtime->GetJavaVM() != nullptr) {
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check_jni = runtime->GetJavaVM()->IsCheckJniEnabled();
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}
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// Get that table.
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const JNINativeInterface* current_table;
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{
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art::MutexLock mu(art::Thread::Current(), *art::Locks::jni_function_table_lock_);
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current_table = art::JNIEnvExt::GetFunctionTable(check_jni);
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}
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// Allocate memory and copy the table.
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unsigned char* data;
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jvmtiError data_result = env->Allocate(sizeof(JNINativeInterface), &data);
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if (data_result != ERR(NONE)) {
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return data_result;
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}
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memcpy(data, current_table, sizeof(JNINativeInterface));
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*function_table = reinterpret_cast<JNINativeInterface*>(data);
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return ERR(NONE);
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}
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} // namespace openjdkjvmti
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