KickJava   Java API By Example, From Geeks To Geeks.

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


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 import soot.dava.internal.javaRep.*;
36
37 abstract public class AbstractGrimpIntBinopExpr
38     extends AbstractIntBinopExpr implements Precedence
39 {
40     public AbstractGrimpIntBinopExpr(Value op1, Value op2)
41     {
42         this(Grimp.v().newArgBox(op1),
43              Grimp.v().newArgBox(op2));
44     }
45
46     protected AbstractGrimpIntBinopExpr(ValueBox op1Box, ValueBox op2Box)
47     {
48         this.op1Box = op1Box;
49         this.op2Box = op2Box;
50     }
51
52     abstract public int getPrecedence();
53
54     private String JavaDoc toString(Value op1, Value op2,
55                             String JavaDoc leftOp, String JavaDoc rightOp)
56     {
57         if (op1 instanceof Precedence &&
58             ((Precedence)op1).getPrecedence() < getPrecedence())
59             leftOp = "(" + leftOp + ")";
60
61     if (op2 instanceof Precedence) {
62         int opPrec = ((Precedence) op2).getPrecedence(),
63         myPrec = getPrecedence();
64         
65         if ((opPrec < myPrec) ||
66         ((opPrec == myPrec) && ((this instanceof SubExpr) || (this instanceof DivExpr) ||
67                     (this instanceof DCmpExpr) || (this instanceof DCmpgExpr) || (this instanceof DCmplExpr))))
68
69         rightOp = "(" + rightOp + ")";
70     }
71
72         return leftOp + getSymbol() + rightOp;
73     }
74
75     public String JavaDoc toString()
76     {
77         Value op1 = op1Box.getValue(), op2 = op2Box.getValue();
78         String JavaDoc leftOp = op1.toString(), rightOp = op2.toString();
79
80         return toString(op1, op2, leftOp, rightOp);
81     }
82 }
83
Popular Tags