/*
Copyright (c) 2010-2011, Advanced Micro Devices, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following
disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided with the distribution.
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derived from this software without specific prior written permission.
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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you hereby certify that, except pursuant to a license granted by the United States Department of Commerce Bureau of
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*/
package com.amd.aparapi.internal.util;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* A wrapper around sun.misc.Unsafe for handling atomic operations, copies from fields to arrays and vice versa.
*
* We avoid using <code>sun.misc.Unsafe</code> directly using reflection, mostly just to avoid getting 'unsafe' compiler errors.
*
* This might need to be changed if we start to see performance issues.
*
* @author gfrost
*
*/
public class UnsafeWrapper{
private static Object unsafe;
private static Method getIntVolatileMethod;
private static Method arrayBaseOffsetMethod;
private static Method arrayIndexScaleMethod;
private static Method getObjectMethod;
private static Method getIntMethod;
private static Method getFloatMethod;
private static Method getByteMethod;
private static Method getBooleanMethod;
private static Method getLongMethod;
private static Method objectFieldOffsetMethod;
private static Method putBooleanMethod;
private static Method putIntMethod;
private static Method putFloatMethod;
private static Method putDoubleMethod;
private static Method putByteMethod;
private static Method putLongMethod;
private static Method compareAndSwapIntMethod;
static {
try {
final Class<?> uc = Class.forName("sun.misc.Unsafe");
final Field field = uc.getDeclaredField("theUnsafe");
field.setAccessible(true);
unsafe = field.get(uc);
getIntVolatileMethod = uc.getDeclaredMethod("getIntVolatile", Object.class, long.class);
arrayBaseOffsetMethod = uc.getDeclaredMethod("arrayBaseOffset", Class.class);
arrayIndexScaleMethod = uc.getDeclaredMethod("arrayIndexScale", Class.class);
getObjectMethod = uc.getDeclaredMethod("getObject", Object.class, long.class);
getIntMethod = uc.getDeclaredMethod("getInt", Object.class, long.class);
getFloatMethod = uc.getDeclaredMethod("getFloat", Object.class, long.class);
getByteMethod = uc.getDeclaredMethod("getByte", Object.class, long.class);
getBooleanMethod = uc.getDeclaredMethod("getBoolean", Object.class, long.class);
getLongMethod = uc.getDeclaredMethod("getLong", Object.class, long.class);
objectFieldOffsetMethod = uc.getDeclaredMethod("objectFieldOffset", Field.class);
putBooleanMethod = uc.getDeclaredMethod("putBoolean", Object.class, long.class, boolean.class);
putIntMethod = uc.getDeclaredMethod("putInt", Object.class, long.class, int.class);
putFloatMethod = uc.getDeclaredMethod("putFloat", Object.class, long.class, float.class);
putDoubleMethod = uc.getDeclaredMethod("putDouble", Object.class, long.class, double.class);
putLongMethod = uc.getDeclaredMethod("putLong", Object.class, long.class, long.class);
putByteMethod = uc.getDeclaredMethod("putByte", Object.class, long.class, byte.class);
compareAndSwapIntMethod = uc.getDeclaredMethod("compareAndSwapInt", Object.class, long.class, int.class, int.class);
} catch (final SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final NoSuchFieldException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static int atomicAdd(int[] _arr, int _index, int _delta) {
if ((_index < 0) || (_index >= _arr.length)) {
throw new IndexOutOfBoundsException("index " + _index);
}
final long rawIndex = intArrayBase + ((long) _index * intArrayScale);
while (true) {
int current;
try {
current = (Integer) getIntVolatileMethod.invoke(unsafe, _arr, rawIndex);
final int next = current + _delta;
if ((Boolean) compareAndSwapIntMethod.invoke(unsafe, _arr, rawIndex, current, next)) {
return current;
}
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static int arrayBaseOffset(Class<?> _arrayClass) {
int offset = 0;
try {
offset = (Integer) (arrayBaseOffsetMethod.invoke(unsafe, _arrayClass));
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return (offset);
}
public static int arrayIndexScale(Class<?> _arrayClass) {
int scale = 0;
try {
scale = (Integer) (arrayIndexScaleMethod.invoke(unsafe, _arrayClass));
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return scale;
}
private static int intArrayBase = arrayBaseOffset(int[].class);
private static int intArrayScale = arrayIndexScale(int[].class);
public static Object getObject(Object _object, long _offset) {
Object object = null;
try {
object = getObjectMethod.invoke(unsafe, _object, _offset);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return (object);
}
public static int getInt(Object _object, long _offset) {
int value = 0;
try {
value = (Integer) getIntMethod.invoke(unsafe, _object, _offset);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return value;
}
public static float getFloat(Object _object, long _offset) {
float value = 0;
try {
value = (Float) getFloatMethod.invoke(unsafe, _object, _offset);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return value;
}
public static byte getByte(Object _object, long _offset) {
byte value = 0;
try {
value = (Byte) getByteMethod.invoke(unsafe, _object, _offset);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return value;
}
public static boolean getBoolean(Object _object, long _offset) {
boolean value = false;
try {
value = (Boolean) getBooleanMethod.invoke(unsafe, _object, _offset);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return value;
}
public static long getLong(Object _object, long _offset) {
long value = 0;
try {
value = (Long) getLongMethod.invoke(unsafe, _object, _offset);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return value;
}
public static void putBoolean(Object _object, long _offset, boolean _boolean) {
try {
putBooleanMethod.invoke(unsafe, _object, _offset, _boolean);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void putFloat(Object _object, long _offset, float _float) {
try {
putFloatMethod.invoke(unsafe, _object, _offset, _float);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void putInt(Object _object, long _offset, int _int) {
try {
putIntMethod.invoke(unsafe, _object, _offset, _int);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void putDouble(Object _object, long _offset, double _double) {
try {
putDoubleMethod.invoke(unsafe, _object, _offset, _double);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void putByte(Object _object, long _offset, byte _byte) {
try {
putByteMethod.invoke(unsafe, _object, _offset, _byte);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void putLong(Object _object, long _offset, long _long) {
try {
putLongMethod.invoke(unsafe, _object, _offset, _long);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static long objectFieldOffset(Field _field) {
long offset = 0l;
try {
offset = (Long) objectFieldOffsetMethod.invoke(unsafe, _field);
} catch (final IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (final InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return offset;
}
}