4 static public final int EXPR=0;
5 static public final int POSITION=1;
6 static public final int ABSTRACT=2;
14 public String toString() {
16 return leftexpr.name()+opcode.toString()+rightexpr.name();
17 else if (type==POSITION)
18 return leftexpr.name()+opcode.toString()+"Position("+String.valueOf(rightposition)+")";
19 else if (type==ABSTRACT) {
20 if (negate) return "!"+leftexpr.name();
21 else return leftexpr.name();
22 } else throw new Error("Unrecognized type");
25 public Updates(Expr lexpr, Expr rexpr, Opcode op, boolean negate) {
27 System.out.println("Building invalid update");
31 /* remove negation through opcode translation */
34 else if (op==Opcode.GE)
36 else if (op==Opcode.EQ)
38 else if (op==Opcode.NE)
40 else if (op==Opcode.LT)
42 else if (op==Opcode.LE)
50 if (leftexpr instanceof VarExpr)
55 VarDescriptor getVar() {
57 return ((VarExpr)leftexpr).getVar();
58 } else if (isField()) {
60 for(;e instanceof DotExpr;e=((DotExpr)e).getExpr()) ;
61 return ((VarExpr)e).getVar();
63 System.out.println(toString());
64 throw new Error("Unrecognized Update");
68 Descriptor getDescriptor() {
70 return ((VarExpr)leftexpr).getVar();
71 } else if (isField()) {
72 return ((DotExpr)leftexpr).getField();
74 System.out.println(toString());
75 throw new Error("Unrecognized Update");
80 if (leftexpr instanceof DotExpr) {
81 assert ((DotExpr)leftexpr).getIndex()==null;
88 return type==Updates.EXPR;
96 public Updates(Expr lexpr, Expr rexpr) {
98 System.out.println("Building invalid update");
105 public Updates(Expr lexpr, int rpos) {
106 if (!lexpr.isValue())
107 System.out.println("Building invalid update");
110 type=Updates.POSITION;
114 boolean isAbstract() {
115 return type==Updates.ABSTRACT;
118 public Updates(Expr lexpr,boolean negates) {
120 type=Updates.ABSTRACT;
125 public int getType() {
128 public Expr getLeftExpr() {
131 public int getRightPos() {
132 assert type==Updates.POSITION;
133 return rightposition;
135 public Expr getRightExpr() {
136 assert type==Updates.EXPR;