Unsafe field access

src/com/esotericsoftware/reflectasm/FieldAccess.java

@@ -7,7 +7,7 @@
  *  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  *  2. 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.
  *  3. Neither the name of Esoteric Software nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
- *
+ * 
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
@@ -26,8 +26,10 @@
 import org.objectweb.asm.Type;
 
 public abstract class FieldAccess {
-	private String[] fieldNames;
-	private Class[] fieldTypes;
+	private static final Object theUnsafe;
+
+	protected String[] fieldNames;
+	protected Class[] fieldTypes;
 
 	public int getIndex (String fieldName) {
 		for (int i = 0, n = fieldNames.length; i < n; i++)
@@ -572,5 +574,25 @@ static private MethodVisitor insertThrowExceptionForFieldType (MethodVisitor mv,
 		mv.visitInsn(ATHROW);
 		return mv;
 	}
-
+
+	static public  FieldAccess getAccessUnsafe(Class<?> type)
+	{
+		if(theUnsafe == null)
+			throw new UnsupportedOperationException();
+
+		return new FieldAccessUnsafe(type, (sun.misc.Unsafe)theUnsafe);
+	}
+
+	static {
+		Object unsafe = null;
+		try {
+			Class<?> clazz = Class.forName("sun.misc.Unsafe");
+			Field field = clazz.getDeclaredField("theUnsafe");
+			field.setAccessible(true);
+			unsafe = field.get(null);
+		} catch (Exception e) {
+		} finally {
+			theUnsafe = unsafe;
+		}
+	}
 }

src/com/esotericsoftware/reflectasm/FieldAccessUnsafe.java

@@ -0,0 +1,144 @@
+package com.esotericsoftware.reflectasm;
+
+import sun.misc.Unsafe;
+
+import java.lang.reflect.*;
+
+@SuppressWarnings("restriction")
+class FieldAccessUnsafe extends FieldAccess {
+	FieldAccessUnsafe(Class<?> clazz, Unsafe unsafe)
+	{
+		this.unsafe = unsafe;
+
+		Field[] fields = clazz.getFields();
+
+		super.fieldNames = new String[fields.length];
+		super.fieldTypes = new Class<?>[fields.length];
+		this.addresses = new long[fields.length];
+
+		for(int i = 0; i < fields.length; i++)
+		{
+			super.fieldNames[i] = fields[i].getName();
+			super.fieldTypes[i] = fields[i].getType();
+			this.addresses[i] = unsafe.objectFieldOffset(fields[i]);
+		}
+	}
+
+	@Override
+	public void set(Object instance, int fieldIndex, Object value) 
+	{
+		unsafe.putObject(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setBoolean(Object instance, int fieldIndex, boolean value) 
+	{
+		unsafe.putBoolean(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setByte(Object instance, int fieldIndex, byte value) 
+	{
+		unsafe.putByte(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setShort(Object instance, int fieldIndex, short value) 
+	{
+		unsafe.putShort(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setInt(Object instance, int fieldIndex, int value) 
+	{
+		unsafe.putInt(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setLong(Object instance, int fieldIndex, long value) 
+	{
+		unsafe.putLong(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setDouble(Object instance, int fieldIndex, double value) 
+	{
+		unsafe.putDouble(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setFloat(Object instance, int fieldIndex, float value) 
+	{
+		unsafe.putFloat(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public void setChar(Object instance, int fieldIndex, char value) 
+	{
+		unsafe.putChar(instance, addresses[fieldIndex], value);
+	}
+
+	@Override
+	public Object get(Object instance, int fieldIndex) 
+	{
+		return unsafe.getObject(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public String getString(Object instance, int fieldIndex) 
+	{
+		return (String)unsafe.getObject(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public char getChar(Object instance, int fieldIndex) 
+	{
+		return unsafe.getChar(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public boolean getBoolean(Object instance, int fieldIndex) 
+	{
+		return unsafe.getBoolean(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public byte getByte(Object instance, int fieldIndex) 
+	{
+		return unsafe.getByte(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public short getShort(Object instance, int fieldIndex) 
+	{
+		return unsafe.getShort(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public int getInt(Object instance, int fieldIndex) 
+	{
+		return unsafe.getInt(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public long getLong(Object instance, int fieldIndex) 
+	{
+		return unsafe.getLong(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public double getDouble(Object instance, int fieldIndex) 
+	{
+		return unsafe.getDouble(instance, addresses[fieldIndex]);
+	}
+
+	@Override
+	public float getFloat(Object instance, int fieldIndex) 
+	{
+		return unsafe.getFloat(instance, addresses[fieldIndex]);
+	}
+
+	long[] addresses;
+
+	private final Unsafe unsafe;
+}