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UnsafeUtil.java
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UnsafeUtil.java
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package me.nallar.unsafe;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import javassist.Modifier;
import me.nallar.tickthreading.Log;
import sun.misc.Unsafe;
public class UnsafeUtil {
private static final Unsafe $ = UnsafeAccess.$;
private static final long baseOffset = $.arrayBaseOffset(Object[].class);
private static final long headerSize = baseOffset - 8;
public static void swap(Object a, Object b) {
// I'm sorry.
// Really.
// :(
long sizeA = sizeOf(a);
long sizeB = sizeOf(b);
if (sizeA != sizeB) {
throw new UnsupportedOperationException("Objects of different classes or sizes can not be swapped.");
}
long temporaryInstanceLocation = $.allocateMemory(sizeA);
long temporaryInstanceLocation2 = $.allocateMemory(sizeA);
$.copyMemory(a, 0, null, temporaryInstanceLocation, sizeA);
$.copyMemory(b, 0, null, temporaryInstanceLocation2, sizeA);
copyMemory(temporaryInstanceLocation, b, sizeA);
copyMemory(temporaryInstanceLocation2, a, sizeA);
$.freeMemory(temporaryInstanceLocation);
$.freeMemory(temporaryInstanceLocation2);
}
private static void copyMemory(long src, Object dest, long size) {
long sSize = size;
while (size > 0) {
if (size >= 8) {
$.putLong(dest, sSize - size, $.getLong(null, src));
size -= 8;
src += 8;
} else if (size >= 4) {
$.putInt(dest, sSize - size, $.getInt(null, src));
size -= 4;
src += 4;
} else if (size >= 2) {
$.putShort(dest, sSize - size, $.getShort(null, src));
size -= 2;
src += 2;
} else {
$.putByte(dest, sSize - size, $.getByte(null, src));
size--;
src++;
}
}
}
public static long sizeOf(Class<?> clazz) {
if (clazz.equals(byte.class) || clazz.equals(char.class)) {
return 1L;
} else if (clazz.equals(short.class)) {
return 2L;
} else if (clazz.equals(int.class) || clazz.equals(float.class)) {
return 4L;
} else if (clazz.equals(long.class) || clazz.equals(double.class)) {
return 8L;
} else {
Field[] fields = clazz.getDeclaredFields();
long sz = 0;
for (Field f : fields) {
if (f.getType().isPrimitive()) {
sz += sizeOf(f.getType());
} else {
sz += 4; //ptr
}
}
sz += headerSize;
return sz;
}
}
public static long sizeOf(Object o) {
return sizeOf(o.getClass());
}
public static boolean arrayEquals(Object a, Object b) {
if (a == b) {
return true;
}
int numLongs = Array.getLength(a);
if (numLongs != Array.getLength(b) || !a.getClass().equals(b.getClass())) {
return false;
}
int baseOffset = $.arrayBaseOffset(a.getClass());
int scaleOffset = $.arrayIndexScale(a.getClass());
for (long currentOffset = baseOffset, i = 0; i < numLongs; ++i, currentOffset += scaleOffset) {
long l1 = $.getLong(a, currentOffset);
long l2 = $.getLong(b, currentOffset);
if (l1 != l2) {
return false;
}
}
return true;
}
public static Object fromAddress(long address) {
Pointer p = new Pointer();
p.setAddress(address);
return p.o;
}
public static long addressOf(Object o) {
Pointer p = new Pointer();
p.o = o;
return p.getAddress();
}
public static <T> T createUninitialisedObject(Class<T> c) {
try {
return (T) $.allocateInstance(c);
} catch (Exception e) {
throw new Error(e);
}
}
public static String info(Object o) {
return "size: " + sizeOf(o) + ", address: " + addressOf(o) + ", class: " + o.getClass().getSimpleName();
}
public static String debugOut(Object a) {
Class<?> c = a.getClass();
StringBuilder out = new StringBuilder();
boolean secondOrLater = false;
for (Field f : c.getDeclaredFields()) {
if ((f.getModifiers() & Modifier.STATIC) == Modifier.STATIC) {
continue;
}
f.setAccessible(true);
try {
if (secondOrLater) {
out.append('\n');
}
out
.append(f.getName())
.append(": ")
.append(f.getType().getName())
.append("; ");
Object value = f.get(a);
Class vC = value.getClass();
if (vC.isArray()) {
if (char[].class.equals(vC)) {
int s = Array.getLength(value);
for (int i = 0; i < s; i++) {
out.append(Array.getChar(value, i));
}
} else {
int s = Array.getLength(value);
for (int i = 0; i < s; i++) {
out.append(Array.get(value, i)).append(',');
}
}
} else {
out.append(value);
}
} catch (IllegalAccessException e) {
Log.severe("", e);
}
secondOrLater = true;
}
return out.toString();
}
public static String compare(Object a, Object b) {
StringBuilder sb = new StringBuilder();
sb.append("a=b: ").append(a.equals(b)).append('\n');
sb.append("a: ").append(debugOut(a)).append('\n');
sb.append("b: ").append(debugOut(b)).append('\n');
sb.append('a').append(UnsafeUtil.info(a)).append('\n');
sb.append('b').append(UnsafeUtil.info(b)).append('\n');
return sb.toString();
}
public static void main(String[] args) {
for (int i = 0; i < 16; i++) {
Log.info(String.valueOf($.getInt(new Long[1], (long) i)));
}
Log.info(String.valueOf($.getInt(new Long[1], 12L)));
//Log.info(String.valueOf(baseOffset));
String a = "String 1";
String b = "String 2";
Log.info(compare(a, b));
UnsafeUtil.swap(a, b);
Log.info(compare(a, b));
}
public static void clean(Object o) {
//Log.info("Clearing " + o.getClass() + '@' + System.identityHashCode(o));
Class c = o.getClass();
while (c != null) {
for (Field field : c.getDeclaredFields()) {
if (field.getType().isPrimitive() || (field.getModifiers() & Modifier.STATIC) == Modifier.STATIC) {
continue;
}
try {
field.setAccessible(true);
field.set(o, null);
//Log.info("Cleaned field " + MappingUtil.debobfuscate(field.getType().getName()) + ':' + field.getName());
} catch (IllegalAccessException e) {
Log.warning("Exception cleaning " + o.getClass() + '@' + System.identityHashCode(o), e);
}
}
c = c.getSuperclass();
}
}
public static RuntimeException throwIgnoreChecked(Throwable t) {
throw UnsafeUtil.<RuntimeException>throwIgnoreCheckedErasure(t);
}
private static <T extends Throwable> T throwIgnoreCheckedErasure(Throwable toThrow) throws T {
throw (T) toThrow;
}
}