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 javafe.ast;
013    
014    import javafe.util.Assert;
015    import javafe.util.Location;
016    import javafe.util.ErrorSet;
017    
018    // Convention: unless otherwise noted, integer fields named "loc" refer
019    // to the location of the first character of the syntactic unit
020    
021    
022    
023    /** 
024     * Used to indicate the type of an illegal operation, so that error messages
025     * do not unnecessarily propagate; should only be used if the error has
026     * already been reported.
027     */
028    public class ErrorType extends Type
029    {
030      public int getStartLoc() { return Location.NULL; }
031    
032      //@ ensures \result != null;
033      //@ ensures !\result.syntax;
034      public static ErrorType make() {
035          //@ set I_will_establish_invariants_afterwards = true;
036          //@ set result.syntax = false;
037          return new ErrorType();
038      }
039    
040    
041    // Generated boilerplate constructors:
042    
043       /**
044        * Construct a raw ErrorType whose class invariant(s) have not
045        * yet been established.  It is the caller's job to
046        * initialize the returned node's fields so that any
047        * class invariants hold.
048        */
049       //@ requires I_will_establish_invariants_afterwards;
050       protected ErrorType() {}    //@ nowarn Invariant,NonNullInit;
051    
052    
053    // Generated boilerplate methods:
054    
055       public final int childCount() {
056          int sz = 0;
057          if (this.tmodifiers != null) sz += this.tmodifiers.size();
058          return sz + 0;
059       }
060    
061       public final Object childAt(int index) {
062               /*throws IndexOutOfBoundsException*/
063          if (index < 0)
064             throw new IndexOutOfBoundsException("AST child index " + index);
065          int indexPre = index;
066    
067          int sz;
068    
069          sz = (this.tmodifiers == null ? 0 : this.tmodifiers.size());
070          if (0 <= index && index < sz)
071             return this.tmodifiers.elementAt(index);
072          else index -= sz;
073    
074          throw new IndexOutOfBoundsException("AST child index " + indexPre);
075       }   //@ nowarn Exception;
076    
077       public final String toString() {
078          return "[ErrorType"
079             + " tmodifiers = " + this.tmodifiers
080             + "]";
081       }
082    
083       public final int getTag() {
084          return TagConstants.ERRORTYPE;
085       }
086    
087       public final void accept(Visitor v) { v.visitErrorType(this); }
088    
089       public final Object accept(VisitorArgResult v, Object o) {return v.visitErrorType(this, o); }
090    
091       public void check() {
092          super.check();
093          if (this.tmodifiers != null)
094             for(int i = 0; i < this.tmodifiers.size(); i++)
095                this.tmodifiers.elementAt(i).check();
096       }
097    
098       //@ ensures \result != null;
099       public static ErrorType make(TypeModifierPragmaVec tmodifiers) {
100          //@ set I_will_establish_invariants_afterwards = true;
101          ErrorType result = new ErrorType();
102          result.tmodifiers = tmodifiers;
103          return result;
104       }
105    }