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Java > Open Source Codes > soot > grimp > internal > AbstractGrimpIntLongBinopExpr


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 1999 Patrick Lam
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */

19
20 /*
21  * Modified by the Sable Research Group and others 1997-1999.
22  * See the 'credits' file distributed with Soot for the complete list of
23  * contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
24  */

25
26
27 package soot.grimp.internal;
28
29 import soot.*;
30 import soot.grimp.*;
31 import soot.util.*;
32 import java.util.*;
33 import soot.jimple.*;
34 import soot.jimple.internal.*;
35
36 abstract public class AbstractGrimpIntLongBinopExpr
37     extends AbstractIntLongBinopExpr implements Precedence
38 {
39     AbstractGrimpIntLongBinopExpr(Value op1, Value op2)
40     {
41         this(Grimp.v().newArgBox(op1),
42              Grimp.v().newArgBox(op2));
43     }
44
45     protected AbstractGrimpIntLongBinopExpr(ValueBox op1Box, ValueBox op2Box)
46     {
47         this.op1Box = op1Box;
48         this.op2Box = op2Box;
49     }
50
51     abstract public int getPrecedence();
52
53     private String JavaDoc toString(Value op1, Value op2,
54                             String JavaDoc leftOp, String JavaDoc rightOp)
55     {
56         if (op1 instanceof Precedence &&
57             ((Precedence)op1).getPrecedence() < getPrecedence())
58             leftOp = "(" + leftOp + ")";
59
60     if (op2 instanceof Precedence) {
61         int opPrec = ((Precedence) op2).getPrecedence(),
62         myPrec = getPrecedence();
63         
64         if ((opPrec < myPrec) ||
65         ((opPrec == myPrec) && ((this instanceof SubExpr) || (this instanceof DivExpr))))
66         rightOp = "(" + rightOp + ")";
67     }
68
69         return leftOp + getSymbol() + rightOp;
70     }
71
72     public String JavaDoc toString()
73     {
74         Value op1 = op1Box.getValue(), op2 = op2Box.getValue();
75         String JavaDoc leftOp = op1.toString(), rightOp = op2.toString();
76
77         return toString(op1, op2, leftOp, rightOp);
78     }
79 }
80
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