/* Copyright (c) 2002-2011 by XMLVM.org
*
* Project Info: http://www.xmlvm.org
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package org.xmlvm.refcount;
import java.util.ArrayList;
import java.util.List;
/**
* This class helps determine how instructions are making use of objects, as
* well as what sort of actions the processor should take.
*
* This represents all aggregated object usage across all code paths.
*/
public class InstructionActions
{
/**
* The registers that hold objects when the CPU executes this instruction.
*/
public RegisterSet getObjectRegs()
{
RegisterSet allEnteredHolding= RegisterSet.none();
for (RegisterSet enteredHold : enteredHoldingObj)
{
allEnteredHolding.orEq(enteredHold);
}
return allEnteredHolding;
}
/**
* The registers that do not hold objects (hold primitives) when the CPUI
* executes this instruction.
*/
public RegisterSet getNonObjectRegs()
{
RegisterSet allEnteredNotHolding= RegisterSet.none();
for (RegisterSet enteredNotHold : enteredNot)
{
allEnteredNotHolding.orEq(enteredNotHold);
}
return allEnteredNotHolding;
}
/**
* If along some code paths, we arrived with an object in a register and on
* another path a primitive in the register, this will tell us so.
*/
public RegisterSet getConflict()
{
return getObjectRegs().and(getNonObjectRegs());
}
/**
* Each time we hit this instruction through a code path, it adds info about
* the object/non object usage to these lists.
*/
public List<RegisterSet> enteredHoldingObj= new ArrayList<RegisterSet>();
public List<RegisterSet> enteredNot= new ArrayList<RegisterSet>();
/**
* The information produced by the InstructionProcessor.
*/
public InstructionUseInfo useInfo;
}