vmkit/mmtk/java/src/org/mmtk/plan/semispace/usePrimitiveWriteBarriers/UsePrimitiveWriteBarriersMutator.java

/*
 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
 *
 *  This file is licensed to You under the Eclipse Public License (EPL);
 *  You may not use this file except in compliance with the License. You
 *  may obtain a copy of the License at
 *
 *      http://www.opensource.org/licenses/eclipse-1.0.php
 *
 *  See the COPYRIGHT.txt file distributed with this work for information
 *  regarding copyright ownership.
 */
package org.mmtk.plan.semispace.usePrimitiveWriteBarriers;

import org.mmtk.plan.semispace.SSMutator;
import org.mmtk.vm.VM;

import org.vmmagic.unboxed.*;
import org.vmmagic.pragma.*;

/**
 * This class extends the {@link SSMutator} class as part of the
 * {@link UsePrimitiveWriteBarriers} collector. It overrides various methods in
 * {@link Mutator} to implement primitive write barriers.
 */
@Uninterruptible
public class UsePrimitiveWriteBarriersMutator extends SSMutator {

  /**
   * Write an Address. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the Word will be stored
   * @param slot The address into which the Word will be
   * stored.
   * @param value The value of the new Address
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void addressWrite(ObjectReference src, Address slot, Address value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.addressWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * Attempt to atomically exchange the value in the given slot
   * with the passed replacement value.
   *
   * @param src The object into which the Address will be stored
   * @param slot The address into which the Address will be
   * stored.
   * @param old The old Address to be swapped out
   * @param value The new Address
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   * @return True if the swap was successful.
   */
  public boolean addressTryCompareAndSwap(ObjectReference src, Address slot, Address old, Address value, Word metaDataA, Word metaDataB, int mode) {
    return VM.barriers.addressTryCompareAndSwap(src, old, value, metaDataA, metaDataB, mode);
  }

  /**
   * Write a boolean. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new boolean
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void booleanWrite(ObjectReference src, Address slot, boolean value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.booleanWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of booleans are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean booleanBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Write a byte. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new byte
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void byteWrite(ObjectReference src, Address slot, byte value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.byteWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of bytes are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean byteBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Write a char. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new char
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void charWrite(ObjectReference src, Address slot, char value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.charWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of chars are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean charBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Write a double. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new double
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void doubleWrite(ObjectReference src, Address slot, double value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.doubleWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of doubles are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean doubleBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Write an Extent. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new Extent
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void extentWrite(ObjectReference src, Address slot, Extent value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.extentWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * Write a float. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new float
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void floatWrite(ObjectReference src, Address slot, float value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.floatWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of floats are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean floatBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Write a int. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new int
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void intWrite(ObjectReference src, Address slot, int value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.intWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of ints are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean intBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Attempt to atomically exchange the value in the given slot
   * with the passed replacement value.
   *
   * @param src The object into which the value will be stored
   * @param slot The address into which the value will be
   * stored.
   * @param old The old int to be swapped out
   * @param value The new int
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   * @return True if the swap was successful.
   */
  public boolean intTryCompareAndSwap(ObjectReference src, Address slot, int old, int value, Word metaDataA, Word metaDataB, int mode) {
    return VM.barriers.intTryCompareAndSwap(src, old, value, metaDataA, metaDataB, mode);
  }

  /**
   * Write a long. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new long
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void longWrite(ObjectReference src, Address slot, long value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.longWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of longs are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean longBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Attempt to atomically exchange the value in the given slot
   * with the passed replacement value.
   *
   * @param src The object into which the value will be stored
   * @param slot The address into which the value will be
   * stored.
   * @param old The old long to be swapped out
   * @param value The new long
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   * @return True if the swap was successful.
   */
  public boolean longTryCompareAndSwap(ObjectReference src, Address slot, long old, long value, Word metaDataA, Word metaDataB, int mode) {
    return VM.barriers.longTryCompareAndSwap(src, old, value, metaDataA, metaDataB, mode);
  }

  /**
   * Write an Offset. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new Offset
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void offsetWrite(ObjectReference src, Address slot, Offset value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.offsetWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * Write a short. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new short
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void shortWrite(ObjectReference src, Address slot, short value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.shortWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * A number of shorts are about to be copied from object
   * <code>src</code> to object <code>dst</code> (as in an array
   * copy).  Thus, <code>dst</code> is the mutated object.  Take
   * appropriate write barrier actions.<p>
   *
   * @param src The source array
   * @param srcOffset The starting source offset
   * @param dst The destination array
   * @param dstOffset The starting destination offset
   * @param bytes The number of bytes to be copied
   * @return True if the update was performed by the barrier, false if
   * left to the caller
   */
  public boolean shortBulkCopy(ObjectReference src, Offset srcOffset, ObjectReference dst, Offset dstOffset, int bytes) {
    return false;
  }

  /**
   * Write a Word. Take appropriate write barrier actions.<p>
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param value The value of the new Word
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   */
  public void wordWrite(ObjectReference src, Address slot, Word value, Word metaDataA, Word metaDataB, int mode) {
    VM.barriers.wordWrite(src, value, metaDataA, metaDataB, mode);
  }

  /**
   * Attempt to atomically exchange the value in the given slot
   * with the passed replacement value.
   *
   * @param src The object into which the new reference will be stored
   * @param slot The address into which the new reference will be
   * stored.
   * @param old The old Word to be swapped out
   * @param value The new Word
   * @param metaDataA A value that assists the host VM in creating a store
   * @param metaDataB A value that assists the host VM in creating a store
   * @param mode The context in which the store occurred
   * @return True if the swap was successful.
   */
  public boolean wordTryCompareAndSwap(ObjectReference src, Address slot, Word old, Word value, Word metaDataA, Word metaDataB, int mode) {
    return VM.barriers.wordTryCompareAndSwap(src, old, value, metaDataA, metaDataB, mode);
  }
}