runtime/native/java_lang_System.cc - LeafOS-Project/android_art - Gitiles

 /*
  * 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
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "java_lang_System.h"

 #include "nativehelper/jni_macros.h"

 #include "common_throws.h"
 #include "gc/accounting/card_table-inl.h"
 #include "jni/jni_internal.h"
 #include "mirror/array.h"
 #include "mirror/class-inl.h"
 #include "mirror/class.h"
 #include "mirror/object-inl.h"
 #include "mirror/object_array-inl.h"
 #include "native_util.h"
 #include "scoped_fast_native_object_access-inl.h"

 namespace art {

 /*
  * We make guarantees about the atomicity of accesses to primitive variables.  These guarantees
  * also apply to elements of arrays. In particular, 8-bit, 16-bit, and 32-bit accesses must not
  * cause "word tearing".  Accesses to 64-bit array elements may be two 32-bit operations.
  * References are never torn regardless of the number of bits used to represent them.
  */

 static void ThrowArrayStoreException_NotAnArray(const char* identifier,
                                                 ObjPtr<mirror::Object> array)
     REQUIRES_SHARED(Locks::mutator_lock_) {
   std::string actualType(mirror::Object::PrettyTypeOf(array));
   Thread* self = Thread::Current();
   self->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
                            "%s of type %s is not an array", identifier, actualType.c_str());
 }

 static void System_arraycopy(JNIEnv* env, jclass, jobject javaSrc, jint srcPos, jobject javaDst,
                              jint dstPos, jint length) {
   // The API is defined in terms of length, but length is somewhat overloaded so we use count.
   const jint count = length;
   ScopedFastNativeObjectAccess soa(env);

   // Null pointer checks.
   if (UNLIKELY(javaSrc == nullptr)) {
     ThrowNullPointerException("src == null");
     return;
   }
   if (UNLIKELY(javaDst == nullptr)) {
     ThrowNullPointerException("dst == null");
     return;
   }

   // Make sure source and destination are both arrays.
   ObjPtr<mirror::Object> srcObject = soa.Decode<mirror::Object>(javaSrc);
   if (UNLIKELY(!srcObject->IsArrayInstance())) {
     ThrowArrayStoreException_NotAnArray("source", srcObject);
     return;
   }
   ObjPtr<mirror::Object> dstObject = soa.Decode<mirror::Object>(javaDst);
   if (UNLIKELY(!dstObject->IsArrayInstance())) {
     ThrowArrayStoreException_NotAnArray("destination", dstObject);
     return;
   }
   ObjPtr<mirror::Array> srcArray = srcObject->AsArray();
   ObjPtr<mirror::Array> dstArray = dstObject->AsArray();

   // Bounds checking.
   if (UNLIKELY(srcPos < 0) || UNLIKELY(dstPos < 0) || UNLIKELY(count < 0) ||
       UNLIKELY(srcPos > srcArray->GetLength() - count) ||
       UNLIKELY(dstPos > dstArray->GetLength() - count)) {
     soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayIndexOutOfBoundsException;",
                                    "src.length=%d srcPos=%d dst.length=%d dstPos=%d length=%d",
                                    srcArray->GetLength(), srcPos, dstArray->GetLength(), dstPos,
                                    count);
     return;
   }

   ObjPtr<mirror::Class> dstComponentType = dstArray->GetClass()->GetComponentType();
   ObjPtr<mirror::Class> srcComponentType = srcArray->GetClass()->GetComponentType();
   Primitive::Type dstComponentPrimitiveType = dstComponentType->GetPrimitiveType();

   if (LIKELY(srcComponentType == dstComponentType)) {
     // Trivial assignability.
     switch (dstComponentPrimitiveType) {
       case Primitive::kPrimVoid:
         LOG(FATAL) << "Unreachable, cannot have arrays of type void";
         UNREACHABLE();
       case Primitive::kPrimBoolean:
       case Primitive::kPrimByte:
         DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 1U);
         // Note: Treating BooleanArray as ByteArray.
         ObjPtr<mirror::ByteArray>::DownCast(dstArray)->Memmove(
             dstPos, ObjPtr<mirror::ByteArray>::DownCast(srcArray), srcPos, count);
         return;
       case Primitive::kPrimChar:
       case Primitive::kPrimShort:
         DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 2U);
         // Note: Treating CharArray as ShortArray.
         ObjPtr<mirror::ShortArray>::DownCast(dstArray)->Memmove(
             dstPos, ObjPtr<mirror::ShortArray>::DownCast(srcArray), srcPos, count);
         return;
       case Primitive::kPrimInt:
       case Primitive::kPrimFloat:
         DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 4U);
         // Note: Treating FloatArray as IntArray.
         ObjPtr<mirror::IntArray>::DownCast(dstArray)->Memmove(
             dstPos, ObjPtr<mirror::IntArray>::DownCast(srcArray), srcPos, count);
         return;
       case Primitive::kPrimLong:
       case Primitive::kPrimDouble:
         DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 8U);
         // Note: Treating DoubleArray as LongArray.
         ObjPtr<mirror::LongArray>::DownCast(dstArray)->Memmove(
             dstPos, ObjPtr<mirror::LongArray>::DownCast(srcArray), srcPos, count);
         return;
       case Primitive::kPrimNot: {
         mirror::ObjectArray<mirror::Object>* dstObjArray =
             dstArray->AsObjectArray<mirror::Object>();
         mirror::ObjectArray<mirror::Object>* srcObjArray =
             srcArray->AsObjectArray<mirror::Object>();
         dstObjArray->AssignableMemmove(dstPos, srcObjArray, srcPos, count);
         return;
       }
       default:
         LOG(FATAL) << "Unknown array type: " << srcArray->PrettyTypeOf();
         UNREACHABLE();
     }
   }
   // If one of the arrays holds a primitive type the other array must hold the exact same type.
   if (UNLIKELY((dstComponentPrimitiveType != Primitive::kPrimNot) ||
                srcComponentType->IsPrimitive())) {
     std::string srcType(srcArray->PrettyTypeOf());
     std::string dstType(dstArray->PrettyTypeOf());
     soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
                                    "Incompatible types: src=%s, dst=%s",
                                    srcType.c_str(), dstType.c_str());
     return;
   }
   // Arrays hold distinct types and so therefore can't alias - use memcpy instead of memmove.
   ObjPtr<mirror::ObjectArray<mirror::Object>> dstObjArray =
       dstArray->AsObjectArray<mirror::Object>();
   ObjPtr<mirror::ObjectArray<mirror::Object>> srcObjArray =
       srcArray->AsObjectArray<mirror::Object>();
   // If we're assigning into say Object[] then we don't need per element checks.
   if (dstComponentType->IsAssignableFrom(srcComponentType)) {
     dstObjArray->AssignableMemcpy(dstPos, srcObjArray, srcPos, count);
     return;
   }
   // This code is never run under a transaction.
   DCHECK(!Runtime::Current()->IsActiveTransaction());
   dstObjArray->AssignableCheckingMemcpy<false>(dstPos, srcObjArray, srcPos, count, true);
 }

 // Template to convert general array to that of its specific primitive type.
 template <typename T>
 inline ObjPtr<T> AsPrimitiveArray(ObjPtr<mirror::Array> array)
     REQUIRES_SHARED(Locks::mutator_lock_) {
   return ObjPtr<T>::DownCast(array);
 }

 template <typename T, Primitive::Type kPrimType>
 inline void System_arraycopyTUnchecked(JNIEnv* env, jobject javaSrc, jint srcPos,
                                        jobject javaDst, jint dstPos, jint count) {
   ScopedFastNativeObjectAccess soa(env);
   ObjPtr<mirror::Object> srcObject = soa.Decode<mirror::Object>(javaSrc);
   ObjPtr<mirror::Object> dstObject = soa.Decode<mirror::Object>(javaDst);
   DCHECK(dstObject != nullptr);
   ObjPtr<mirror::Array> srcArray = srcObject->AsArray();
   ObjPtr<mirror::Array> dstArray = dstObject->AsArray();
   DCHECK_GE(count, 0);
   DCHECK_EQ(srcArray->GetClass(), dstArray->GetClass());
   DCHECK_EQ(srcArray->GetClass()->GetComponentType()->GetPrimitiveType(), kPrimType);
   AsPrimitiveArray<T>(dstArray)->Memmove(dstPos, AsPrimitiveArray<T>(srcArray), srcPos, count);
 }

 static void System_arraycopyCharUnchecked(JNIEnv* env, jclass, jcharArray javaSrc, jint srcPos,
                                           jcharArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::CharArray, Primitive::kPrimChar>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyByteUnchecked(JNIEnv* env, jclass, jbyteArray javaSrc, jint srcPos,
                                           jbyteArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::ByteArray, Primitive::kPrimByte>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyShortUnchecked(JNIEnv* env, jclass, jshortArray javaSrc, jint srcPos,
                                            jshortArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::ShortArray, Primitive::kPrimShort>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyIntUnchecked(JNIEnv* env, jclass, jintArray javaSrc, jint srcPos,
                                          jintArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::IntArray, Primitive::kPrimInt>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyLongUnchecked(JNIEnv* env, jclass, jlongArray javaSrc, jint srcPos,
                                           jlongArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::LongArray, Primitive::kPrimLong>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyFloatUnchecked(JNIEnv* env, jclass, jfloatArray javaSrc, jint srcPos,
                                            jfloatArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::FloatArray, Primitive::kPrimFloat>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyDoubleUnchecked(JNIEnv* env, jclass, jdoubleArray javaSrc, jint srcPos,
                                             jdoubleArray javaDst, jint dstPos, jint count) {
   System_arraycopyTUnchecked<mirror::DoubleArray, Primitive::kPrimDouble>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static void System_arraycopyBooleanUnchecked(JNIEnv* env,
                                              jclass,
                                              jbooleanArray javaSrc,
                                              jint srcPos,
                                              jbooleanArray javaDst,
                                              jint dstPos,
                                              jint count) {
   System_arraycopyTUnchecked<mirror::BooleanArray, Primitive::kPrimBoolean>(env, javaSrc, srcPos,
       javaDst, dstPos, count);
 }

 static JNINativeMethod gMethods[] = {
   FAST_NATIVE_METHOD(System, arraycopy, "(Ljava/lang/Object;ILjava/lang/Object;II)V"),
   FAST_NATIVE_METHOD(System, arraycopyCharUnchecked, "([CI[CII)V"),
   FAST_NATIVE_METHOD(System, arraycopyByteUnchecked, "([BI[BII)V"),
   FAST_NATIVE_METHOD(System, arraycopyShortUnchecked, "([SI[SII)V"),
   FAST_NATIVE_METHOD(System, arraycopyIntUnchecked, "([II[III)V"),
   FAST_NATIVE_METHOD(System, arraycopyLongUnchecked, "([JI[JII)V"),
   FAST_NATIVE_METHOD(System, arraycopyFloatUnchecked, "([FI[FII)V"),
   FAST_NATIVE_METHOD(System, arraycopyDoubleUnchecked, "([DI[DII)V"),
   FAST_NATIVE_METHOD(System, arraycopyBooleanUnchecked, "([ZI[ZII)V"),
 };

 void register_java_lang_System(JNIEnv* env) {
   REGISTER_NATIVE_METHODS("java/lang/System");
 }

 }  // namespace art
	/*
	* 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
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "java_lang_System.h"

	#include "nativehelper/jni_macros.h"

	#include "common_throws.h"
	#include "gc/accounting/card_table-inl.h"
	#include "jni/jni_internal.h"
	#include "mirror/array.h"
	#include "mirror/class-inl.h"
	#include "mirror/class.h"
	#include "mirror/object-inl.h"
	#include "mirror/object_array-inl.h"
	#include "native_util.h"
	#include "scoped_fast_native_object_access-inl.h"

	namespace art {

	/*
	* We make guarantees about the atomicity of accesses to primitive variables. These guarantees
	* also apply to elements of arrays. In particular, 8-bit, 16-bit, and 32-bit accesses must not
	* cause "word tearing". Accesses to 64-bit array elements may be two 32-bit operations.
	* References are never torn regardless of the number of bits used to represent them.
	*/

	static void ThrowArrayStoreException_NotAnArray(const char* identifier,
	ObjPtr<mirror::Object> array)
	REQUIRES_SHARED(Locks::mutator_lock_) {
	std::string actualType(mirror::Object::PrettyTypeOf(array));
	Thread* self = Thread::Current();
	self->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
	"%s of type %s is not an array", identifier, actualType.c_str());
	}

	static void System_arraycopy(JNIEnv* env, jclass, jobject javaSrc, jint srcPos, jobject javaDst,
	jint dstPos, jint length) {
	// The API is defined in terms of length, but length is somewhat overloaded so we use count.
	const jint count = length;
	ScopedFastNativeObjectAccess soa(env);

	// Null pointer checks.
	if (UNLIKELY(javaSrc == nullptr)) {
	ThrowNullPointerException("src == null");
	return;
	}
	if (UNLIKELY(javaDst == nullptr)) {
	ThrowNullPointerException("dst == null");
	return;
	}

	// Make sure source and destination are both arrays.
	ObjPtr<mirror::Object> srcObject = soa.Decode<mirror::Object>(javaSrc);
	if (UNLIKELY(!srcObject->IsArrayInstance())) {
	ThrowArrayStoreException_NotAnArray("source", srcObject);
	return;
	}
	ObjPtr<mirror::Object> dstObject = soa.Decode<mirror::Object>(javaDst);
	if (UNLIKELY(!dstObject->IsArrayInstance())) {
	ThrowArrayStoreException_NotAnArray("destination", dstObject);
	return;
	}
	ObjPtr<mirror::Array> srcArray = srcObject->AsArray();
	ObjPtr<mirror::Array> dstArray = dstObject->AsArray();

	// Bounds checking.
	if (UNLIKELY(srcPos < 0) \|\| UNLIKELY(dstPos < 0) \|\| UNLIKELY(count < 0) \|\|
	UNLIKELY(srcPos > srcArray->GetLength() - count) \|\|
	UNLIKELY(dstPos > dstArray->GetLength() - count)) {
	soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayIndexOutOfBoundsException;",
	"src.length=%d srcPos=%d dst.length=%d dstPos=%d length=%d",
	srcArray->GetLength(), srcPos, dstArray->GetLength(), dstPos,
	count);
	return;
	}

	ObjPtr<mirror::Class> dstComponentType = dstArray->GetClass()->GetComponentType();
	ObjPtr<mirror::Class> srcComponentType = srcArray->GetClass()->GetComponentType();
	Primitive::Type dstComponentPrimitiveType = dstComponentType->GetPrimitiveType();

	if (LIKELY(srcComponentType == dstComponentType)) {
	// Trivial assignability.
	switch (dstComponentPrimitiveType) {
	case Primitive::kPrimVoid:
	LOG(FATAL) << "Unreachable, cannot have arrays of type void";
	UNREACHABLE();
	case Primitive::kPrimBoolean:
	case Primitive::kPrimByte:
	DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 1U);
	// Note: Treating BooleanArray as ByteArray.
	ObjPtr<mirror::ByteArray>::DownCast(dstArray)->Memmove(
	dstPos, ObjPtr<mirror::ByteArray>::DownCast(srcArray), srcPos, count);
	return;
	case Primitive::kPrimChar:
	case Primitive::kPrimShort:
	DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 2U);
	// Note: Treating CharArray as ShortArray.
	ObjPtr<mirror::ShortArray>::DownCast(dstArray)->Memmove(
	dstPos, ObjPtr<mirror::ShortArray>::DownCast(srcArray), srcPos, count);
	return;
	case Primitive::kPrimInt:
	case Primitive::kPrimFloat:
	DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 4U);
	// Note: Treating FloatArray as IntArray.
	ObjPtr<mirror::IntArray>::DownCast(dstArray)->Memmove(
	dstPos, ObjPtr<mirror::IntArray>::DownCast(srcArray), srcPos, count);
	return;
	case Primitive::kPrimLong:
	case Primitive::kPrimDouble:
	DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 8U);
	// Note: Treating DoubleArray as LongArray.
	ObjPtr<mirror::LongArray>::DownCast(dstArray)->Memmove(
	dstPos, ObjPtr<mirror::LongArray>::DownCast(srcArray), srcPos, count);
	return;
	case Primitive::kPrimNot: {
	mirror::ObjectArray<mirror::Object>* dstObjArray =
	dstArray->AsObjectArray<mirror::Object>();
	mirror::ObjectArray<mirror::Object>* srcObjArray =
	srcArray->AsObjectArray<mirror::Object>();
	dstObjArray->AssignableMemmove(dstPos, srcObjArray, srcPos, count);
	return;
	}
	default:
	LOG(FATAL) << "Unknown array type: " << srcArray->PrettyTypeOf();
	UNREACHABLE();
	}
	}
	// If one of the arrays holds a primitive type the other array must hold the exact same type.
	if (UNLIKELY((dstComponentPrimitiveType != Primitive::kPrimNot) \|\|
	srcComponentType->IsPrimitive())) {
	std::string srcType(srcArray->PrettyTypeOf());
	std::string dstType(dstArray->PrettyTypeOf());
	soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
	"Incompatible types: src=%s, dst=%s",
	srcType.c_str(), dstType.c_str());
	return;
	}
	// Arrays hold distinct types and so therefore can't alias - use memcpy instead of memmove.
	ObjPtr<mirror::ObjectArray<mirror::Object>> dstObjArray =
	dstArray->AsObjectArray<mirror::Object>();
	ObjPtr<mirror::ObjectArray<mirror::Object>> srcObjArray =
	srcArray->AsObjectArray<mirror::Object>();
	// If we're assigning into say Object[] then we don't need per element checks.
	if (dstComponentType->IsAssignableFrom(srcComponentType)) {
	dstObjArray->AssignableMemcpy(dstPos, srcObjArray, srcPos, count);
	return;
	}
	// This code is never run under a transaction.
	DCHECK(!Runtime::Current()->IsActiveTransaction());
	dstObjArray->AssignableCheckingMemcpy<false>(dstPos, srcObjArray, srcPos, count, true);
	}

	// Template to convert general array to that of its specific primitive type.
	template <typename T>
	inline ObjPtr<T> AsPrimitiveArray(ObjPtr<mirror::Array> array)
	REQUIRES_SHARED(Locks::mutator_lock_) {
	return ObjPtr<T>::DownCast(array);
	}

	template <typename T, Primitive::Type kPrimType>
	inline void System_arraycopyTUnchecked(JNIEnv* env, jobject javaSrc, jint srcPos,
	jobject javaDst, jint dstPos, jint count) {
	ScopedFastNativeObjectAccess soa(env);
	ObjPtr<mirror::Object> srcObject = soa.Decode<mirror::Object>(javaSrc);
	ObjPtr<mirror::Object> dstObject = soa.Decode<mirror::Object>(javaDst);
	DCHECK(dstObject != nullptr);
	ObjPtr<mirror::Array> srcArray = srcObject->AsArray();
	ObjPtr<mirror::Array> dstArray = dstObject->AsArray();
	DCHECK_GE(count, 0);
	DCHECK_EQ(srcArray->GetClass(), dstArray->GetClass());
	DCHECK_EQ(srcArray->GetClass()->GetComponentType()->GetPrimitiveType(), kPrimType);
	AsPrimitiveArray<T>(dstArray)->Memmove(dstPos, AsPrimitiveArray<T>(srcArray), srcPos, count);
	}

	static void System_arraycopyCharUnchecked(JNIEnv* env, jclass, jcharArray javaSrc, jint srcPos,
	jcharArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::CharArray, Primitive::kPrimChar>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyByteUnchecked(JNIEnv* env, jclass, jbyteArray javaSrc, jint srcPos,
	jbyteArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::ByteArray, Primitive::kPrimByte>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyShortUnchecked(JNIEnv* env, jclass, jshortArray javaSrc, jint srcPos,
	jshortArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::ShortArray, Primitive::kPrimShort>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyIntUnchecked(JNIEnv* env, jclass, jintArray javaSrc, jint srcPos,
	jintArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::IntArray, Primitive::kPrimInt>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyLongUnchecked(JNIEnv* env, jclass, jlongArray javaSrc, jint srcPos,
	jlongArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::LongArray, Primitive::kPrimLong>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyFloatUnchecked(JNIEnv* env, jclass, jfloatArray javaSrc, jint srcPos,
	jfloatArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::FloatArray, Primitive::kPrimFloat>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyDoubleUnchecked(JNIEnv* env, jclass, jdoubleArray javaSrc, jint srcPos,
	jdoubleArray javaDst, jint dstPos, jint count) {
	System_arraycopyTUnchecked<mirror::DoubleArray, Primitive::kPrimDouble>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static void System_arraycopyBooleanUnchecked(JNIEnv* env,
	jclass,
	jbooleanArray javaSrc,
	jint srcPos,
	jbooleanArray javaDst,
	jint dstPos,
	jint count) {
	System_arraycopyTUnchecked<mirror::BooleanArray, Primitive::kPrimBoolean>(env, javaSrc, srcPos,
	javaDst, dstPos, count);
	}

	static JNINativeMethod gMethods[] = {
	FAST_NATIVE_METHOD(System, arraycopy, "(Ljava/lang/Object;ILjava/lang/Object;II)V"),
	FAST_NATIVE_METHOD(System, arraycopyCharUnchecked, "([CI[CII)V"),
	FAST_NATIVE_METHOD(System, arraycopyByteUnchecked, "([BI[BII)V"),
	FAST_NATIVE_METHOD(System, arraycopyShortUnchecked, "([SI[SII)V"),
	FAST_NATIVE_METHOD(System, arraycopyIntUnchecked, "([II[III)V"),
	FAST_NATIVE_METHOD(System, arraycopyLongUnchecked, "([JI[JII)V"),
	FAST_NATIVE_METHOD(System, arraycopyFloatUnchecked, "([FI[FII)V"),
	FAST_NATIVE_METHOD(System, arraycopyDoubleUnchecked, "([DI[DII)V"),
	FAST_NATIVE_METHOD(System, arraycopyBooleanUnchecked, "([ZI[ZII)V"),
	};

	void register_java_lang_System(JNIEnv* env) {
	REGISTER_NATIVE_METHODS("java/lang/System");
	}

	} // namespace art