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