/*
* Copyright (c) 2011, EPFL
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the EPFL 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 OWNER 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.
*/
package net.sf.orcc.backends.transform;
import java.util.HashMap;
import java.util.Map;
import net.sf.orcc.df.Actor;
import net.sf.orcc.df.util.DfVisitor;
import net.sf.orcc.ir.InstLoad;
import net.sf.orcc.ir.IrFactory;
import net.sf.orcc.ir.Type;
import net.sf.orcc.ir.Var;
import net.sf.orcc.ir.util.AbstractIrVisitor;
/**
* This class defines a transformation that replaces actor parameters by a
* global variables. actor.
*
* @author Thavot Richard
* @version 1.1
*/
public class ParameterImporter extends DfVisitor<Void> {
private Map<Var, Var> paramToGlobalVarMap;
public ParameterImporter() {
this.irVisitor = new InnerIrVisitor();
this.paramToGlobalVarMap = new HashMap<Var, Var>();
}
private class InnerIrVisitor extends AbstractIrVisitor<Void> {
/**
* Overwrite each load source that calls an actor parameter
*/
@Override
public Void caseInstLoad(InstLoad load) {
Var loadedVar = load.getSource().getVariable();
if (paramToGlobalVarMap.containsKey(loadedVar)) {
load.getSource()
.setVariable(paramToGlobalVarMap.get(loadedVar));
}
return null;
}
}
/**
* Visit an actor for replacing actor parameters by a global variables.
*/
@Override
public Void caseActor(Actor actor) {
this.actor = actor;
paramToGlobalVarMap.clear();
for (Var parameter : actor.getParameters()) {
Var paramVar = newGlobalVariable(parameter.getType(), "param_"
+ parameter.getName());
paramVar.setInitialValue(IrFactory.eINSTANCE
.createExprVar(parameter));
paramToGlobalVarMap.put(parameter, paramVar);
}
return super.caseActor(actor);
}
/**
* Create a new unassignable global variable.
*
* @param type
* @param hint
* @return
*/
private Var newGlobalVariable(Type type, String hint) {
String name = hint;
Var variable = actor.getStateVar(name);
int i = 0;
while (variable != null) {
name = hint + i;
variable = actor.getStateVar(name);
i++;
}
variable = IrFactory.eINSTANCE.createVar(0, type, name, false, 0);
actor.getStateVars().add(variable);
return variable;
}
}