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FastJNI_java_lang_System.cpp
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/*******************************************************************************
* Copyright (c) 2001, 2014 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "fastJNI.h"
#include "j9protos.h"
#include "j9consts.h"
#include "BytecodeAction.hpp"
#include "VMHelpers.hpp"
#include "ArrayCopyHelpers.hpp"
#undef FAST_JNI_ARRAYCOPY
extern "C" {
/* java.lang.System: public static native long currentTimeMillis(); */
jlong JNICALL
Fast_java_lang_System_currentTimeMillis(J9VMThread *currentThread)
{
PORT_ACCESS_FROM_VMC(currentThread);
return j9time_current_time_millis();
}
/* java.lang.System: public static native long nanoTime(); */
jlong JNICALL
Fast_java_lang_System_nanoTime(J9VMThread *currentThread)
{
PORT_ACCESS_FROM_VMC(currentThread);
return j9time_nano_time();
}
#if defined(FAST_JNI_ARRAYCOPY)
static VMINLINE VM_BytecodeAction
doReferenceArrayCopy(J9VMThread *currentThread, j9object_t srcObject, I_32 srcStart, j9object_t destObject, I_32 destStart, I_32 elementCount, I_32 *aiobIndex)
{
VM_BytecodeAction rc = EXECUTE_BYTECODE;
if (elementCount < 0) {
*aiobIndex = elementCount;
rc = THROW_AIOB;
} else {
I_32 value = VM_ArrayCopyHelpers::rangeCheck(currentThread, srcObject, srcStart, elementCount);
if (0 != value) {
*aiobIndex = value;
rc = THROW_AIOB;
} else {
value = VM_ArrayCopyHelpers::rangeCheck(currentThread, destObject, destStart, elementCount);
if (0 != value) {
*aiobIndex = value;
rc = THROW_AIOB;
} else {
value = VM_ArrayCopyHelpers::referenceArrayCopy(currentThread, srcObject, srcStart, destObject, destStart, elementCount);
if (-1 != value) {
rc = THROW_ARRAY_STORE;
}
}
}
}
return rc;
}
static VMINLINE VM_BytecodeAction
doPrimitiveArrayCopy(J9VMThread *currentThread, j9object_t srcObject, I_32 srcStart, j9object_t destObject, I_32 destStart, U_32 arrayShape, I_32 elementCount, I_32 *aiobIndex)
{
VM_BytecodeAction rc = EXECUTE_BYTECODE;
/* Primitive array */
if (elementCount < 0) {
*aiobIndex = elementCount;
rc = THROW_AIOB;
} else {
I_32 value = VM_ArrayCopyHelpers::rangeCheck(currentThread, srcObject, srcStart, elementCount);
if (0 != value) {
*aiobIndex = value;
rc = THROW_AIOB;
} else {
value = VM_ArrayCopyHelpers::rangeCheck(currentThread, destObject, destStart, elementCount);
if (0 != value) {
*aiobIndex = value;
rc = THROW_AIOB;
} else {
if (elementCount > 0) {
VM_ArrayCopyHelpers::primitiveArrayCopy(currentThread, srcObject, srcStart, destObject, destStart, elementCount, arrayShape);
}
}
}
}
return rc;
}
/* java.lang.System: public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length); */
void JNICALL
Fast_java_lang_System_arraycopy(J9VMThread *currentThread, j9object_t src, jint srcPos, j9object_t dest, jint destPos, jint length)
{
if ((NULL == src) || (NULL == dest)) {
setCurrentException(currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else {
J9Class *srcClass = J9OBJECT_CLAZZ(currentThread, src);
J9ROMClass *srcRom = srcClass->romClass;
if (J9ROMCLASS_IS_ARRAY(srcRom)) {
J9Class *destClass = J9OBJECT_CLAZZ(currentThread, dest);
J9ROMClass *destRom = destClass->romClass;
if (!J9ROMCLASS_IS_ARRAY(destRom)) {
goto throwArrayStore;
} else {
I_32 aiobIndex = 0;
if (OBJECT_HEADER_SHAPE_POINTERS == J9CLASS_SHAPE(srcClass)) {
/* Reference array */
if (OBJECT_HEADER_SHAPE_POINTERS != J9CLASS_SHAPE(destClass)) {
goto throwArrayStore;
} else {
VM_BytecodeAction rc = doReferenceArrayCopy(currentThread, src, srcPos, dest, destPos, length, &aiobIndex);
switch(rc) {
case THROW_AIOB:
goto throwAIOB;
case THROW_ARRAY_STORE:
goto throwArrayStore;
}
}
} else {
if (srcClass != destClass) {
goto throwArrayStore;
} else {
VM_BytecodeAction rc = doPrimitiveArrayCopy(currentThread, src, srcPos, dest, destPos, ((J9ROMArrayClass*)srcClass->romClass)->arrayShape & 0x0000FFFF, length, &aiobIndex);
if (rc == THROW_AIOB) {
throwAIOB:
setArrayIndexOutOfBoundsException(currentThread, aiobIndex);
}
}
}
}
} else {
throwArrayStore:
setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGARRAYSTOREEXCEPTION, NULL);
}
}
}
#endif /* FAST_JNI_ARRAYCOPY */
J9_FAST_JNI_METHOD_TABLE(java_lang_System)
J9_FAST_JNI_METHOD("currentTimeMillis", "()J", Fast_java_lang_System_currentTimeMillis,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_NOT_GC_POINT | J9_FAST_JNI_NO_NATIVE_METHOD_FRAME | J9_FAST_JNI_NO_EXCEPTION_THROW |
J9_FAST_JNI_NO_SPECIAL_TEAR_DOWN | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
J9_FAST_JNI_METHOD("nanoTime", "()J", Fast_java_lang_System_nanoTime,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_NOT_GC_POINT | J9_FAST_JNI_NO_NATIVE_METHOD_FRAME | J9_FAST_JNI_NO_EXCEPTION_THROW |
J9_FAST_JNI_NO_SPECIAL_TEAR_DOWN | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
#if defined(FAST_JNI_ARRAYCOPY)
J9_FAST_JNI_METHOD("arraycopy", "(Ljava/lang/Object;ILjava/lang/Object;II)V", Fast_java_lang_System_arraycopy,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
#endif /* FAST_JNI_ARRAYCOPY */
J9_FAST_JNI_METHOD_TABLE_END
}