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* Copyright (C) 2008 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "class_linker.h"
#include "debugger.h"
#include "jni_internal.h"
#include "object.h"
#include "thread.h"
#include "JniConstants.h" // Last to avoid problems with LOG redefinition.
#include "toStringArray.h"
#include <limits.h>
namespace art {
namespace {
jfloat VMRuntime_getTargetHeapUtilization(JNIEnv*, jobject) {
return Heap::GetTargetHeapUtilization();
void VMRuntime_nativeSetTargetHeapUtilization(JNIEnv*, jobject, jfloat target) {
void VMRuntime_startJitCompilation(JNIEnv*, jobject) {
void VMRuntime_disableJitCompilation(JNIEnv*, jobject) {
jobject VMRuntime_newNonMovableArray(JNIEnv* env, jobject, jclass javaElementClass, jint length) {
ScopedThreadStateChange tsc(Thread::Current(), Thread::kRunnable);
// TODO: right now, we don't have a copying collector, so there's no need
// to do anything special here, but we ought to pass the non-movability
// through to the allocator.
Class* element_class = Decode<Class*>(env, javaElementClass);
if (element_class == NULL) {
Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;", "element class == null");
return NULL;
if (length < 0) {
Thread::Current()->ThrowNewExceptionF("Ljava/lang/NegativeArraySizeException;", "%d", length);
return NULL;
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
std::string descriptor;
descriptor += "[";
descriptor += element_class->GetDescriptor()->ToModifiedUtf8();
Class* array_class = class_linker->FindClass(descriptor, NULL);
Array* result = Array::Alloc(array_class, length);
if (result == NULL) {
return NULL;
return AddLocalReference<jobject>(env, result);
jlong VMRuntime_addressOf(JNIEnv* env, jobject, jobject javaArray) {
ScopedThreadStateChange tsc(Thread::Current(), Thread::kRunnable);
Array* array = Decode<Array*>(env, javaArray);
if (!array->IsArrayInstance()) {
Thread::Current()->ThrowNewException("Ljava/lang/IllegalArgumentException;", "not an array");
return 0;
// TODO: we should also check that this is a non-movable array.
return reinterpret_cast<uintptr_t>(array->GetRawData());
void VMRuntime_clearGrowthLimit(JNIEnv*, jobject) {
jboolean VMRuntime_isDebuggerActive(JNIEnv*, jobject) {
return Dbg::IsDebuggerConnected();
jobjectArray VMRuntime_properties(JNIEnv* env, jobject) {
return toStringArray(env, Runtime::Current()->GetProperties());
jstring VMRuntime_bootClassPath(JNIEnv* env, jobject) {
return env->NewStringUTF(Runtime::Current()->GetBootClassPath().c_str());
jstring VMRuntime_classPath(JNIEnv* env, jobject) {
return env->NewStringUTF(Runtime::Current()->GetClassPath().c_str());
jstring VMRuntime_vmVersion(JNIEnv* env, jobject) {
return env->NewStringUTF(Runtime::Current()->GetVersion());
void VMRuntime_setTargetSdkVersion(JNIEnv* env, jobject, jint targetSdkVersion) {
// This is the target SDK version of the app we're about to run.
// Note that this value may be CUR_DEVELOPMENT (10000).
// Note that this value may be 0, meaning "current".
if (targetSdkVersion > 0 && targetSdkVersion <= 13 /* honeycomb-mr2 */) {
// TODO: running with CheckJNI should override this and force you to obey the strictest rules.
LOG(INFO) << "Turning on JNI app bug workarounds for target SDK version " << targetSdkVersion << "...";
UNIMPLEMENTED(WARNING) << "can we get this as a command-line argument?";
//gDvmJni.work_around_app_jni_bugs = true;
JNINativeMethod gMethods[] = {
NATIVE_METHOD(VMRuntime, addressOf, "(Ljava/lang/Object;)J"),
NATIVE_METHOD(VMRuntime, bootClassPath, "()Ljava/lang/String;"),
NATIVE_METHOD(VMRuntime, classPath, "()Ljava/lang/String;"),
NATIVE_METHOD(VMRuntime, clearGrowthLimit, "()V"),
NATIVE_METHOD(VMRuntime, disableJitCompilation, "()V"),
NATIVE_METHOD(VMRuntime, getTargetHeapUtilization, "()F"),
NATIVE_METHOD(VMRuntime, isDebuggerActive, "()Z"),
NATIVE_METHOD(VMRuntime, nativeSetTargetHeapUtilization, "(F)V"),
NATIVE_METHOD(VMRuntime, newNonMovableArray, "(Ljava/lang/Class;I)Ljava/lang/Object;"),
NATIVE_METHOD(VMRuntime, properties, "()[Ljava/lang/String;"),
NATIVE_METHOD(VMRuntime, setTargetSdkVersion, "(I)V"),
NATIVE_METHOD(VMRuntime, startJitCompilation, "()V"),
NATIVE_METHOD(VMRuntime, vmVersion, "()Ljava/lang/String;"),
} // namespace
void register_dalvik_system_VMRuntime(JNIEnv* env) {
jniRegisterNativeMethods(env, "dalvik/system/VMRuntime", gMethods, NELEM(gMethods));
} // namespace art