blinky-core/ObjectAddress.java at main · spideruci/blinky-core · GitHub

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packageorg.spideruci.analysis.dynamic;

importjava.lang.reflect.Field;

importsun.misc.Unsafe;

@SuppressWarnings("restriction")
publicclassObjectAddress {

/**
 * Code copied from
 * <a href="http://jtechbits.blogspot.com/2012/03/getting-address-of-object.html">
 * http://jtechbits.blogspot.com
 * </a>.
 * @param object
 * @return
 */
publicstaticlonggetObjectAddress(Objectobject) {
Unsafeunsafe = getUnsafe();
longaddress = -1;

if(null != unsafe) {
try {


address = getAddressFromObjectSetter(object, unsafe);

 } catch(Exceptione) {
e.printStackTrace();
 }
 } else
System.out.println("Getting unsafe failed!");

System.out.println("---------");

returnaddress;
 }

privatestaticlonggetAddressFromObjectSetter(Objectobject, Unsafeunsafe) throwsNoSuchFieldException {
intfieldOffset = unsafe.fieldOffset(Dummy.class.getDeclaredField("value"));
System.out.println("\nField (value) offset: " + fieldOffset);
intfield2Offset = unsafe.fieldOffset(Dummy.class.getDeclaredField("xyz"));
System.out.println("\nField (value) offset: " + field2Offset);

longaddress;
ObjectSetterobjStr = newObjectSetter();
objStr.setObject(object);

intobjOffset = unsafe.fieldOffset(ObjectSetter.class.getDeclaredField("obj"));
System.out.println("Field (obj) offset: " + objOffset);

address = unsafe.getInt(objStr, (long) objOffset);
System.out.println("ObjectSetter's hashcode: " + objStr.hashCode());
System.out.println("Dummy's hashcode: " + object.hashCode());
System.out.println("Dummy's object address: " + address);
returnaddress;
 }

publicstaticvoidmain(String[] args) {
getObjectAddress(newDummy());
getObjectAddress(newDummy());
getObjectAddress(newDummy());
getObjectAddress(newObject());

 }

privatestaticUnsafegetUnsafe() {
Unsafeunsafe = null;

try {
Fieldfield = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
field.setAccessible(true);
unsafe = (Unsafe) field.get(null);
 } catch(Exceptionexception) {
exception.printStackTrace();
 }

returnunsafe;
 }
}

classObjectSetter {
privateObjectobj;

publicvoidsetObject(Objectobj) {
this.obj = obj;
 }
}

classDummy {
privateintvalue = 123;
privateStringxyz = "123";

publicintgetValue() {
returnvalue;
 }
}