/*
 * Bytecode Analysis Framework
 * Copyright (C) 2003,2004 University of Maryland
 * 
 * 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
 */

package edu.umd.cs.findbugs.ba.vna;

import edu.umd.cs.findbugs.SystemProperties;

/**
 * Global flags controlling ValueNumberAnalysis.
 */
public interface ValueNumberAnalysisFeatures {
	/**
	 * When set, perform redundant load elimination and forward substitution.
	 * Note that we do <em>not</em> do this in a correctness-preserving way!
	 * For example, we don't kill loads when methods are called, even though
	 * those methods could change heap values.  The intent here is simply
	 * to try to handle situations where a field is read multiple times,
	 * where the intent of the programmer is clearly that the loaded values
	 * will be the same in each case.
	 * <p/>
	 * <p> Eventually, we might do interprocedural analysis that would allow
	 * accurate modeling of which fields a called method could modify,
	 * which would allow a more correct implementation.
	 */
	public static final boolean REDUNDANT_LOAD_ELIMINATION = !SystemProperties.getBoolean("vna.noRLE");

	/**
	 * Debug redundant load elimination.
	 */
	public static final boolean RLE_DEBUG = SystemProperties.getBoolean("vna.rle.debug");
}

// vim:ts=4
