001    /* Copyright 2000, 2001, Compaq Computer Corporation */
002    
003    /* IF THIS IS A JAVA FILE, DO NOT EDIT IT!  
004    
005       Most Java files in this directory which are part of the Javafe AST
006       are automatically generated using the astgen comment (see
007       ESCTools/Javafe/astgen) from the input file 'hierarchy.h'.  If you
008       wish to modify AST classes or introduce new ones, modify
009       'hierarchy.j.'
010     */
011    
012    package escjava.ast;
013    
014    import java.util.Hashtable;
015    import java.util.Set;
016    import java.util.ArrayList;
017    
018    import javafe.ast.*;
019    import javafe.util.Assert;
020    import javafe.util.Location;
021    import escjava.ParsedRoutineSpecs;
022    
023    // Convention: unless otherwise noted, integer fields named "loc" refer
024    // to the location of the first character of the syntactic unit
025    
026    //# TagBase javafe.tc.TagConstants.LAST_TAG + 1
027    //# VisitorRoot javafe.ast.Visitor
028    
029    
030    public class LabelExpr extends GCExpr
031    {
032      public boolean positive;
033    
034      public /*@ non_null @*/ Identifier label;
035    
036      public /*@ non_null @*/ Expr expr;
037    
038    
039    
040    // Generated boilerplate constructors:
041    
042      /**
043       * Construct a raw LabelExpr whose class invariant(s) have not
044       * yet been established.  It is the caller's job to
045       * initialize the returned node's fields so that any
046       * class invariants hold.
047       */
048      //@ requires I_will_establish_invariants_afterwards;
049      protected LabelExpr() {}    //@ nowarn Invariant,NonNullInit;
050    
051    
052    // Generated boilerplate methods:
053    
054      public final int childCount() {
055         return 2;
056      }
057    
058      public final Object childAt(int index) {
059              /*throws IndexOutOfBoundsException*/
060         if (index < 0)
061            throw new IndexOutOfBoundsException("AST child index " + index);
062         int indexPre = index;
063    
064         int sz;
065    
066         if (index == 0) return this.label;
067         else index--;
068    
069         if (index == 0) return this.expr;
070         else index--;
071    
072         throw new IndexOutOfBoundsException("AST child index " + indexPre);
073      }   //@ nowarn Exception;
074    
075      public final String toString() {
076         return "[LabelExpr"
077            + " sloc = " + this.sloc
078            + " eloc = " + this.eloc
079            + " positive = " + this.positive
080            + " label = " + this.label
081            + " expr = " + this.expr
082            + "]";
083      }
084    
085      public final int getTag() {
086         return TagConstants.LABELEXPR;
087      }
088    
089      public final void accept(javafe.ast.Visitor v) { 
090        if (v instanceof Visitor) ((Visitor)v).visitLabelExpr(this);
091      }
092    
093      public final Object accept(javafe.ast.VisitorArgResult v, Object o) { 
094        if (v instanceof VisitorArgResult) return ((VisitorArgResult)v).visitLabelExpr(this, o); else return null;
095      }
096    
097      public void check() {
098         super.check();
099         this.label.check();
100         this.expr.check();
101      }
102    
103      //@ ensures \result != null;
104      public static LabelExpr make(int sloc, int eloc, boolean positive, /*@ non_null @*/ Identifier label, /*@ non_null @*/ Expr expr) {
105         //@ set I_will_establish_invariants_afterwards = true;
106         LabelExpr result = new LabelExpr();
107         result.sloc = sloc;
108         result.eloc = eloc;
109         result.positive = positive;
110         result.label = label;
111         result.expr = expr;
112         return result;
113      }
114    }