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StateVar.java

package edu.ksu.cis.bandera.bir;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Bandera, a Java(TM) analysis and transformation toolkit           *
 * Copyright (C) 1998, 1999   James Corbett (corbett@hawaii.edu)     *
 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project in the SAnToS Laboratory,         *
 * Department of Computing and Information Sciences, Kansas State    *
 * University, USA (http://www.cis.ksu.edu/santos).                  *
 * It is understood that any modification not identified as such is  *
 * not covered by the preceding statement.                           *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this toolkit; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other SAnToS projects, please visit the web-site *
 *                http://www.cis.ksu.edu/santos                      *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import ca.mcgill.sable.util.*;

import java.io.*;
import java.util.*;

/**
 * State variable.
 */

public class StateVar implements Expr, BirConstants {

    int id;                     // Unique id
    String name;                // Name of variable
    BirThread thread;           // Thread is local to (null if global)
    boolean constant;           // Is a constant (set exactly once)
    Type type;                  // Type of variable
    Expr initVal;               // Initial value
    TransSystem system;         // TransSystem belonging to
    int offset;                 // Offset in BirState 
    int actualSize;             // Actual size (of collection) in BirTrace 
    int actualBaseTypeSize;     // Actual size (of array collect) in trace
    int actualBaseTypeExtent;   // Actual extent in trace

    static int varCount = 0;    // Number of variables allocated


    /**
     * Create a state variable.
     * @param name name of variable 
     * @param thread enclosing thread (if null, then var is global)
     * @param type type of variable
     * @param initVal the initial value (if null, default for type is used) 
     */
    public StateVar(String name, BirThread thread, Type type, 
            Expr initVal, TransSystem system) {
    this.name = name;
    this.id = ++varCount;
    this.thread = thread;
    this.type = type;
    this.system = system;
    if (initVal != null)
        this.initVal = initVal;
    else
        this.initVal = type.defaultVal();
    }
    public void apply(Switch sw)
    {
        ((ExprSwitch) sw).caseStateVar(this);
    }
    public int getActualBaseTypeExtent() { return actualBaseTypeExtent; }
    public int getActualBaseTypeSize() { return actualBaseTypeSize; }
    public int getActualSize() { return actualSize; }
    public Expr getInitVal() { return initVal; }
    public String getName() { return name; }
    public int getOffset() { return offset; }
    public TransSystem getSystem() { return system; }
    public BirThread getThread() { return thread; }
    public Type getType() { return type; }
    public boolean isConstant() { return constant; }
    public boolean isLocal() { return (thread != null); }
    public void print() {
    System.out.print(getName());
    }
    public void setActualBaseTypeExtent(int actualBaseTypeExtent) { 
    this.actualBaseTypeExtent = actualBaseTypeExtent; 
    }
    public void setActualBaseTypeSize(int actualBaseTypeSize) { 
    this.actualBaseTypeSize = actualBaseTypeSize; 
    }
    public void setActualSize(int actualSize) { this.actualSize = actualSize; }
    public void setConstant(boolean constant) { this.constant = constant; }
    public void setInitVal(Expr val) { this.initVal = val; }
    public void setOffset(int offset) { this.offset = offset; }
    public void setThread(BirThread thread) { this.thread = thread; }
    public String toString() {
    String isLocal = isLocal() ? "" : "* ";
    return "<StateVar " + id + " " + name + " " 
        + isLocal + type.toString() +  ">";
    }
}

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