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 SubstExpr extends GCExpr
031    {
032      public /*@ non_null @*/ GenericVarDecl var;
033    
034      public /*@ non_null @*/ Expr val;
035    
036      public /*@ non_null @*/ Expr target;
037    
038    
039    
040    // Generated boilerplate constructors:
041    
042      /**
043       * Construct a raw SubstExpr 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 SubstExpr() {}    //@ nowarn Invariant,NonNullInit;
050    
051    
052    // Generated boilerplate methods:
053    
054      public final int childCount() {
055         return 3;
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.var;
067         else index--;
068    
069         if (index == 0) return this.val;
070         else index--;
071    
072         if (index == 0) return this.target;
073         else index--;
074    
075         throw new IndexOutOfBoundsException("AST child index " + indexPre);
076      }   //@ nowarn Exception;
077    
078      public final String toString() {
079         return "[SubstExpr"
080            + " sloc = " + this.sloc
081            + " eloc = " + this.eloc
082            + " var = " + this.var
083            + " val = " + this.val
084            + " target = " + this.target
085            + "]";
086      }
087    
088      public final int getTag() {
089         return TagConstants.SUBSTEXPR;
090      }
091    
092      public final void accept(javafe.ast.Visitor v) { 
093        if (v instanceof Visitor) ((Visitor)v).visitSubstExpr(this);
094      }
095    
096      public final Object accept(javafe.ast.VisitorArgResult v, Object o) { 
097        if (v instanceof VisitorArgResult) return ((VisitorArgResult)v).visitSubstExpr(this, o); else return null;
098      }
099    
100      public void check() {
101         super.check();
102         this.var.check();
103         this.val.check();
104         this.target.check();
105      }
106    
107      //@ ensures \result != null;
108      public static SubstExpr make(int sloc, int eloc, /*@ non_null @*/ GenericVarDecl var, /*@ non_null @*/ Expr val, /*@ non_null @*/ Expr target) {
109         //@ set I_will_establish_invariants_afterwards = true;
110         SubstExpr result = new SubstExpr();
111         result.sloc = sloc;
112         result.eloc = eloc;
113         result.var = var;
114         result.val = val;
115         result.target = target;
116         return result;
117      }
118    }