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 * Represents various kinds of field access expressions. 024 * The FieldDecl is filled in by the name resolution code. 025 */ 026 027 public class FieldAccess extends Expr 028 { 029 public /*@ non_null @*/ ObjectDesignator od; 030 031 public /*@ non_null @*/ Identifier id; 032 033 //@ invariant locId != javafe.util.Location.NULL; 034 public int locId; 035 036 037 //@ invariant decl == null || decl.id==id; 038 public FieldDecl decl; 039 040 private void postCheck() { 041 if (decl != null) { 042 Assert.notFalse(id == decl.id); 043 // Any other invariants here...??? 044 } 045 } 046 public int getStartLoc() { 047 int locOd = od.getStartLoc(); 048 if (locOd == Location.NULL) 049 return locId; 050 else 051 return locOd; 052 } 053 public int getEndLoc() { return locId; } 054 055 //@ requires locId != javafe.util.Location.NULL; 056 //@ ensures \result != null; 057 public static FieldAccess make(/*@ non_null @*/ ObjectDesignator od, 058 /*@ non_null @*/ Identifier id, 059 int locId) { 060 //@ set I_will_establish_invariants_afterwards = true; 061 FieldAccess result = new FieldAccess(); 062 result.od = od; 063 result.id = id; 064 result.locId = locId; 065 result.decl = null; // Easier than puting an ensures on constructor 066 return result; 067 } 068 069 070 // Generated boilerplate constructors: 071 072 /** 073 * Construct a raw FieldAccess whose class invariant(s) have not 074 * yet been established. It is the caller's job to 075 * initialize the returned node's fields so that any 076 * class invariants hold. 077 */ 078 //@ requires I_will_establish_invariants_afterwards; 079 protected FieldAccess() {} //@ nowarn Invariant,NonNullInit; 080 081 082 // Generated boilerplate methods: 083 084 public final int childCount() { 085 return 2; 086 } 087 088 public final Object childAt(int index) { 089 /*throws IndexOutOfBoundsException*/ 090 if (index < 0) 091 throw new IndexOutOfBoundsException("AST child index " + index); 092 int indexPre = index; 093 094 int sz; 095 096 if (index == 0) return this.od; 097 else index--; 098 099 if (index == 0) return this.id; 100 else index--; 101 102 throw new IndexOutOfBoundsException("AST child index " + indexPre); 103 } //@ nowarn Exception; 104 105 public final String toString() { 106 return "[FieldAccess" 107 + " od = " + this.od 108 + " id = " + this.id 109 + " locId = " + this.locId 110 + "]"; 111 } 112 113 public final int getTag() { 114 return TagConstants.FIELDACCESS; 115 } 116 117 public final void accept(Visitor v) { v.visitFieldAccess(this); } 118 119 public final Object accept(VisitorArgResult v, Object o) {return v.visitFieldAccess(this, o); } 120 121 public void check() { 122 super.check(); 123 this.od.check(); 124 if (this.id == null) throw new RuntimeException(); 125 postCheck(); 126 } 127 128 }