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 NothingExpr extends Expr 031 { 032 public int loc; 033 034 035 public int getStartLoc() { return loc; } 036 037 038 // Generated boilerplate constructors: 039 040 /** 041 * Construct a raw NothingExpr whose class invariant(s) have not 042 * yet been established. It is the caller's job to 043 * initialize the returned node's fields so that any 044 * class invariants hold. 045 */ 046 //@ requires I_will_establish_invariants_afterwards; 047 protected NothingExpr() {} //@ nowarn Invariant,NonNullInit; 048 049 050 // Generated boilerplate methods: 051 052 public final int childCount() { 053 return 0; 054 } 055 056 public final Object childAt(int index) { 057 /*throws IndexOutOfBoundsException*/ 058 if (index < 0) 059 throw new IndexOutOfBoundsException("AST child index " + index); 060 int indexPre = index; 061 062 int sz; 063 064 throw new IndexOutOfBoundsException("AST child index " + indexPre); 065 } //@ nowarn Exception; 066 067 public final String toString() { 068 return "[NothingExpr" 069 + " loc = " + this.loc 070 + "]"; 071 } 072 073 public final int getTag() { 074 return TagConstants.NOTHINGEXPR; 075 } 076 077 public final void accept(javafe.ast.Visitor v) { 078 if (v instanceof Visitor) ((Visitor)v).visitNothingExpr(this); 079 } 080 081 public final Object accept(javafe.ast.VisitorArgResult v, Object o) { 082 if (v instanceof VisitorArgResult) return ((VisitorArgResult)v).visitNothingExpr(this, o); else return null; 083 } 084 085 public void check() { 086 } 087 088 //@ ensures \result != null; 089 public static NothingExpr make(int loc) { 090 //@ set I_will_establish_invariants_afterwards = true; 091 NothingExpr result = new NothingExpr(); 092 result.loc = loc; 093 return result; 094 } 095 }