/* Soot - a J*va Optimization Framework
* Copyright (C) 1997-1999 Raja Vallee-Rai
*
* This library 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot.jimple.toolkits.scalar;
import soot.options.*;
import soot.*;
import soot.jimple.*;
import soot.util.*;
import java.util.*;
public class NopEliminator extends BodyTransformer
{
public NopEliminator( Singletons.Global g ) {}
public static NopEliminator v() { return G.v().soot_jimple_toolkits_scalar_NopEliminator(); }
/** Removes {@link NopStmt}s from the passed body (which must be
a {@link JimpleBody}). Complexity is linear
with respect to the statements.
*/
protected void internalTransform(Body b, String phaseName, Map options)
{
JimpleBody body = (JimpleBody)b;
if(Options.v().verbose())
G.v().out.println("[" + body.getMethod().getName() +
"] Removing nops...");
Chain units = body.getUnits();
// Just do one trivial pass.
{
Iterator stmtIt = units.snapshotIterator();
while(stmtIt.hasNext())
{
Stmt s = (Stmt) stmtIt.next();
if(s instanceof NopStmt)
units.remove(s);
}
}
}
}