4 static public final int EXPR=0;
5 static public final int POSITION=1;
6 static public final int ACCESSPATH=2;
7 static public final int ABSTRACT=3;
15 ArrayAnalysis.AccessPath ap;
18 public Updates(Expr lexpr, int fieldnum, ArrayAnalysis.AccessPath ap, int slot) {
20 this.fieldnum=fieldnum;
22 this.rightposition=slot;
24 this.type=Updates.ACCESSPATH;
25 this.opcode=Opcode.EQ;
28 public Updates(Expr lexpr, Expr rexpr, Opcode op, boolean negate) {
30 System.out.println("Building invalid update");
34 op=Opcode.translateOpcode(negate,op);
40 public Updates(Expr lexpr, Expr rexpr) {
42 System.out.println("Building invalid update");
49 public Updates(Expr lexpr, int rpos) {
51 System.out.println("Building invalid update");
54 type=Updates.POSITION;
58 public Updates(Expr lexpr,boolean negates) {
60 type=Updates.ABSTRACT;
65 VarDescriptor getVar() {
67 return ((VarExpr)leftexpr).getVar();
68 } else if (isField()) {
71 for(;e instanceof DotExpr;e=((DotExpr)e).getExpr()) ;
72 if (e instanceof VarExpr)
74 if (e instanceof CastExpr)
75 e=((CastExpr)e).getExpr();
76 else throw new Error("Unrecognized Expr:"+e.name());
78 return ((VarExpr)e).getVar();
80 System.out.println(toString());
81 throw new Error("Unrecognized Update");
85 Descriptor getDescriptor() {
87 return ((VarExpr)leftexpr).getVar();
88 } else if (isField()) {
89 return ((DotExpr)leftexpr).getField();
91 System.out.println(toString());
92 throw new Error("Unrecognized Update");
97 if (leftexpr instanceof VarExpr)
103 if (leftexpr instanceof DotExpr) {
104 assert ((DotExpr)leftexpr).getIndex()==null;
111 return type==Updates.EXPR;
119 boolean isAbstract() {
120 return type==Updates.ABSTRACT;
123 public int getType() {
127 public Expr getLeftExpr() {
131 public int getRightPos() {
132 assert type==Updates.POSITION||type==Updates.ACCESSPATH;
133 return rightposition;
136 public Expr getRightExpr() {
137 assert type==Updates.EXPR;
141 public int getFieldNum() {
142 assert type==Updates.ACCESSPATH;
146 public ArrayAnalysis.AccessPath getAccessPath() {
147 assert type==Updates.ACCESSPATH;
151 public String toString() {
153 return leftexpr.name()+opcode.toString()+rightexpr.name();
154 else if (type==POSITION)
155 return leftexpr.name()+opcode.toString()+"Position("+String.valueOf(rightposition)+")";
156 else if (type==ACCESSPATH) {
157 return leftexpr.name()+opcode.toString()+"Field("+fieldnum+","+ap+") of Position("+String.valueOf(rightposition)+")";
158 } else if (type==ABSTRACT) {
159 if (negate) return "!"+leftexpr.name();
160 else return leftexpr.name();
161 } else throw new Error("Unrecognized type");