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 ExprStmtPragma extends StmtPragma
031    {
032      public int tag;
033    
034      public /*@ non_null @*/ Expr expr;
035    
036      public Expr label;
037    
038      public int loc;
039    
040    
041      public final int getTag() { return tag; }
042    
043      private void postCheck() {
044        boolean goodtag = (tag == TagConstants.ASSERT || 
045                           tag == TagConstants.ASSUME || 
046                           tag == TagConstants.DECREASES ||
047                           tag == TagConstants.DECREASING ||
048                           tag == TagConstants.MAINTAINING || 
049                           tag == TagConstants.LOOP_INVARIANT || 
050                           tag == TagConstants.LOOP_PREDICATE);
051        Assert.notFalse(goodtag);
052      }
053    
054      public int getStartLoc() { return loc; }
055      public int getEndLoc() { return expr.getEndLoc(); }
056    
057    
058    // Generated boilerplate constructors:
059    
060      /**
061       * Construct a raw ExprStmtPragma whose class invariant(s) have not
062       * yet been established.  It is the caller's job to
063       * initialize the returned node's fields so that any
064       * class invariants hold.
065       */
066      //@ requires I_will_establish_invariants_afterwards;
067      protected ExprStmtPragma() {}    //@ nowarn Invariant,NonNullInit;
068    
069    
070    // Generated boilerplate methods:
071    
072      public final int childCount() {
073         return 2;
074      }
075    
076      public final Object childAt(int index) {
077              /*throws IndexOutOfBoundsException*/
078         if (index < 0)
079            throw new IndexOutOfBoundsException("AST child index " + index);
080         int indexPre = index;
081    
082         int sz;
083    
084         if (index == 0) return this.expr;
085         else index--;
086    
087         if (index == 0) return this.label;
088         else index--;
089    
090         throw new IndexOutOfBoundsException("AST child index " + indexPre);
091      }   //@ nowarn Exception;
092    
093      public final String toString() {
094         return "[ExprStmtPragma"
095            + " tag = " + this.tag
096            + " expr = " + this.expr
097            + " label = " + this.label
098            + " loc = " + this.loc
099            + "]";
100      }
101    
102      public final void accept(javafe.ast.Visitor v) { 
103        if (v instanceof Visitor) ((Visitor)v).visitExprStmtPragma(this);
104      }
105    
106      public final Object accept(javafe.ast.VisitorArgResult v, Object o) { 
107        if (v instanceof VisitorArgResult) return ((VisitorArgResult)v).visitExprStmtPragma(this, o); else return null;
108      }
109    
110      public void check() {
111         this.expr.check();
112         if (this.label != null)
113            this.label.check();
114         postCheck();
115      }
116    
117      //@ ensures \result != null;
118      public static ExprStmtPragma make(int tag, /*@ non_null @*/ Expr expr, Expr label, int loc) {
119         //@ set I_will_establish_invariants_afterwards = true;
120         ExprStmtPragma result = new ExprStmtPragma();
121         result.tag = tag;
122         result.expr = expr;
123         result.label = label;
124         result.loc = loc;
125         return result;
126      }
127    }