analysisfeatures.java

A static analysis tool to find bugs in Java programs

/*
 * 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;

/**
 * Boolean analysis properties for use in the AnalysisContext.
 * These can be used to enable or disable various analysis features
 * in the bytecode analysis framework.
 * 
 * @author David Hovemeyer
 */
public interface AnalysisFeatures {
	/**
	 * Determine (1) what exceptions can be thrown on exception edges,
	 * (2) which catch blocks are reachable, and (3) which exception
	 * edges carry only "implicit" runtime exceptions.
	 */
	public static final int ACCURATE_EXCEPTIONS = 0;

	/**
	 * A boolean flag which if set means that analyses should try to
	 * conserve space at the expense of precision.
	 */
	public static final int CONSERVE_SPACE = 1;

	/**
	 * If true, model the effect of instanceof checks in type analysis.
	 */
	public static final int MODEL_INSTANCEOF = 2;

	/**
	 * Skip generating CFG's and methodGen's for huge methods
	 */
	public static final int SKIP_HUGE_METHODS = 3;

	/**
	 * Perform interative opcode stack analysis
	 */
	public static final int INTERATIVE_OPCODE_STACK_ANALYSIS = 4;

	/**
	 * In the null pointer analysis, track null values that are
	 * guaranteed to be dereferenced on some (non-implicit-exception) path.
	 */
	public static final int TRACK_GUARANTEED_VALUE_DEREFS_IN_NULL_POINTER_ANALYSIS = 5;

	/**
	 * In the null pointer analysis, track value numbers that are known to be
	 * null.  This allows us to not lose track of null values that are not
	 * currently in the stack frame but might be in a heap location
	 * where the value is recoverable by redundant load elimination or
	 * forward substitution.
	 */
	public static final int TRACK_VALUE_NUMBERS_IN_NULL_POINTER_ANALYSIS = 6;

	/**
	 * Number of boolean analysis properties reserved for the bytecode analysis framework.
	 * Clients of the framework may use property values >= this value.
	 */
	public static final int NUM_BOOLEAN_ANALYSIS_PROPERTIES = 128; 

}

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