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 IfStmt extends Stmt 023 { 024 public /*@ non_null @*/ Expr expr; 025 026 public /*@ non_null @*/ Stmt thn; 027 028 public /*@ non_null @*/ Stmt els; 029 030 //@ invariant loc != javafe.util.Location.NULL; 031 public int loc; 032 033 034 private void postCheck() { 035 int t = thn.getTag(); 036 Assert.notFalse(t != TagConstants.SWITCHLABEL //@ nowarn Pre; 037 && t != TagConstants.CONSTRUCTORINVOCATION 038 && t != TagConstants.VARDECLSTMT); 039 t = els.getTag(); 040 Assert.notFalse(t != TagConstants.SWITCHLABEL //@ nowarn Pre; 041 && t != TagConstants.CONSTRUCTORINVOCATION 042 && t != TagConstants.VARDECLSTMT); 043 } 044 public int getStartLoc() { return loc; } 045 public int getEndLoc() { 046 int thenL = thn.getEndLoc(); 047 int elseL = els.getEndLoc(); 048 return Math.max(thenL, elseL); 049 } 050 051 052 // Generated boilerplate constructors: 053 054 /** 055 * Construct a raw IfStmt whose class invariant(s) have not 056 * yet been established. It is the caller's job to 057 * initialize the returned node's fields so that any 058 * class invariants hold. 059 */ 060 //@ requires I_will_establish_invariants_afterwards; 061 protected IfStmt() {} //@ nowarn Invariant,NonNullInit; 062 063 064 // Generated boilerplate methods: 065 066 public final int childCount() { 067 return 3; 068 } 069 070 public final Object childAt(int index) { 071 /*throws IndexOutOfBoundsException*/ 072 if (index < 0) 073 throw new IndexOutOfBoundsException("AST child index " + index); 074 int indexPre = index; 075 076 int sz; 077 078 if (index == 0) return this.expr; 079 else index--; 080 081 if (index == 0) return this.thn; 082 else index--; 083 084 if (index == 0) return this.els; 085 else index--; 086 087 throw new IndexOutOfBoundsException("AST child index " + indexPre); 088 } //@ nowarn Exception; 089 090 public final String toString() { 091 return "[IfStmt" 092 + " expr = " + this.expr 093 + " thn = " + this.thn 094 + " els = " + this.els 095 + " loc = " + this.loc 096 + "]"; 097 } 098 099 public final int getTag() { 100 return TagConstants.IFSTMT; 101 } 102 103 public final void accept(Visitor v) { v.visitIfStmt(this); } 104 105 public final Object accept(VisitorArgResult v, Object o) {return v.visitIfStmt(this, o); } 106 107 public void check() { 108 super.check(); 109 this.expr.check(); 110 this.thn.check(); 111 this.els.check(); 112 postCheck(); 113 } 114 115 //@ requires loc != javafe.util.Location.NULL; 116 //@ ensures \result != null; 117 public static IfStmt make(/*@ non_null @*/ Expr expr, /*@ non_null @*/ Stmt thn, /*@ non_null @*/ Stmt els, int loc) { 118 //@ set I_will_establish_invariants_afterwards = true; 119 IfStmt result = new IfStmt(); 120 result.expr = expr; 121 result.thn = thn; 122 result.els = els; 123 result.loc = loc; 124 return result; 125 } 126 }