001    // -*- mode: java -*-
002    /* Copyright 2000, 2001, Compaq Computer Corporation */
003    
004    /* IF THIS IS A JAVA FILE, DO NOT EDIT IT!  
005    
006       Most Java files in this directory which are part of the Javafe AST
007       are automatically generated using the astgen comment (see
008       ESCTools/Javafe/astgen) from the input file 'hierarchy.h'.  If you
009       wish to modify AST classes or introduce new ones, modify
010       'hierarchy.j.'
011     */
012    
013    package escjava.ast;
014    
015    import java.util.Hashtable;
016    import java.util.Set;
017    import java.util.ArrayList;
018    
019    import javafe.ast.*;
020    import javafe.util.Assert;
021    import javafe.util.Location;
022    import escjava.ParsedRoutineSpecs;
023    
024    // Convention: unless otherwise noted, integer fields named "loc" refer
025    // to the location of the first character of the syntactic unit
026    
027    //# TagBase javafe.tc.TagConstants.LAST_TAG + 1
028    //# VisitorRoot javafe.ast.Visitor
029    
030    
031    public class RestoreFromCmd extends AssignCmd
032    {
033      // denotes RESTORE v FROM rhs
034      // which has the same effect as v := rhs
035      // but does not count "v" as a target
036    
037    
038    // Generated boilerplate constructors:
039    
040       //@ ensures this.v == v;
041       //@ ensures this.rhs == rhs;
042       protected RestoreFromCmd(/*@ non_null @*/ VariableAccess v, /*@ non_null @*/ Expr rhs) {
043          super(v, rhs);
044       }
045    
046    // Generated boilerplate methods:
047    
048       public final int childCount() {
049          return 2;
050       }
051    
052       public final Object childAt(int index) {
053               /*throws IndexOutOfBoundsException*/
054          if (index < 0)
055             throw new IndexOutOfBoundsException("AST child index " + index);
056          int indexPre = index;
057    
058          int sz;
059    
060          if (index == 0) return this.v;
061          else index--;
062    
063          if (index == 0) return this.rhs;
064          else index--;
065    
066          throw new IndexOutOfBoundsException("AST child index " + indexPre);
067       }   //@ nowarn Exception;
068    
069       public final /*@non_null*/String toString() {
070          return "[RestoreFromCmd"
071             + " v = " + this.v
072             + " rhs = " + this.rhs
073             + "]";
074       }
075    
076       public final int getTag() {
077          return TagConstants.RESTOREFROMCMD;
078       }
079    
080       public final void accept(javafe.ast.Visitor v) { 
081          if (v instanceof Visitor) ((Visitor)v).visitRestoreFromCmd(this);
082       }
083    
084       public final Object accept(javafe.ast.VisitorArgResult v, Object o) { 
085          if (v instanceof VisitorArgResult) return ((VisitorArgResult)v).visitRestoreFromCmd(this, o); else return null;
086       }
087    
088       public void check() {
089          super.check();
090          this.v.check();
091          this.rhs.check();
092       }
093    
094       //@ ensures \result != null;
095       public static RestoreFromCmd make(/*@ non_null @*/ VariableAccess v, /*@ non_null @*/ Expr rhs) {
096          RestoreFromCmd result = new RestoreFromCmd(v, rhs);
097          return result;
098       }
099    }