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    public class LabelStmt extends Stmt
023    {
024      public /*@ non_null @*/ Identifier label;
025    
026      public /*@ non_null @*/ Stmt stmt;
027    
028      //@ invariant locId != javafe.util.Location.NULL;
029      public int locId;
030    
031    
032      private void postCheck() {
033        int t = stmt.getTag();
034        Assert.notFalse(t != TagConstants.SWITCHLABEL       //@ nowarn Pre;
035                        && t != TagConstants.CONSTRUCTORINVOCATION
036                        && t != TagConstants.VARDECLSTMT);
037      }
038      public int getStartLoc() { return locId; }
039      public int getEndLoc() { return stmt.getEndLoc(); }
040    
041    
042    // Generated boilerplate constructors:
043    
044      /**
045       * Construct a raw LabelStmt whose class invariant(s) have not
046       * yet been established.  It is the caller's job to
047       * initialize the returned node's fields so that any
048       * class invariants hold.
049       */
050      //@ requires I_will_establish_invariants_afterwards;
051      protected LabelStmt() {}    //@ nowarn Invariant,NonNullInit;
052    
053    
054    // Generated boilerplate methods:
055    
056      public final int childCount() {
057         return 2;
058      }
059    
060      public final Object childAt(int index) {
061              /*throws IndexOutOfBoundsException*/
062         if (index < 0)
063            throw new IndexOutOfBoundsException("AST child index " + index);
064         int indexPre = index;
065    
066         int sz;
067    
068         if (index == 0) return this.label;
069         else index--;
070    
071         if (index == 0) return this.stmt;
072         else index--;
073    
074         throw new IndexOutOfBoundsException("AST child index " + indexPre);
075      }   //@ nowarn Exception;
076    
077      public final String toString() {
078         return "[LabelStmt"
079            + " label = " + this.label
080            + " stmt = " + this.stmt
081            + " locId = " + this.locId
082            + "]";
083      }
084    
085      public final int getTag() {
086         return TagConstants.LABELSTMT;
087      }
088    
089      public final void accept(Visitor v) { v.visitLabelStmt(this); }
090    
091      public final Object accept(VisitorArgResult v, Object o) {return v.visitLabelStmt(this, o); }
092    
093      public void check() {
094         super.check();
095         if (this.label == null) throw new RuntimeException();
096         this.stmt.check();
097         postCheck();
098      }
099    
100      //@ requires locId != javafe.util.Location.NULL;
101      //@ ensures \result != null;
102      public static LabelStmt make(/*@ non_null @*/ Identifier label, /*@ non_null @*/ Stmt stmt, int locId) {
103         //@ set I_will_establish_invariants_afterwards = true;
104         LabelStmt result = new LabelStmt();
105         result.label = label;
106         result.stmt = stmt;
107         result.locId = locId;
108         return result;
109      }
110    }