1 cananian 1.1.2.1 // PFOFFSET.java, created Wed Jan 20 21:47:52 1999 by cananian
 2 cananian 1.1.2.1 // Copyright (C) 1999 C. Scott Ananian <cananian@alumni.princeton.edu>
 3 cananian 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
 4 cananian 1.1.2.1 package harpoon.IR.LowQuad;
 5 cananian 1.1.2.1 
 6 cananian 1.1.2.1 import harpoon.ClassFile.HCodeElement;
 7 cananian 1.1.2.1 import harpoon.ClassFile.HField;
 8 cananian 1.1.2.1 import harpoon.Temp.Temp;
 9 cananian 1.1.2.1 import harpoon.Temp.TempMap;
10 cananian 1.1.2.1 import harpoon.Util.Util;
11 cananian 1.1.2.1 
12 cananian 1.1.2.1 /**
13 cananian 1.1.2.1  * <code>PFOFFSET</code> computes the <code>POINTER</code> offset 
14 cananian 1.1.2.1  * needed to access a given <b>non-static</b> field. <code>PFCONST</code>
15 cananian 1.1.2.1  * is used to access a static field.
16 cananian 1.1.2.1  * 
17 cananian 1.1.2.1  * @author  C. Scott Ananian <cananian@alumni.princeton.edu>
18 cananian 1.5      * @version $Id: PFOFFSET.java,v 1.5 2002/04/11 04:00:21 cananian Exp $
19 cananian 1.1.2.1  */
20 cananian 1.1.2.1 public class PFOFFSET extends PCONST {
21 cananian 1.1.2.1     /** The <code>HField</code> to address. */
22 cananian 1.1.2.1     protected final HField field;
23 cananian 1.1.2.1     
24 cananian 1.1.2.1     /** Creates a <code>PFOFFSET</code> representing the <code>POINTER</code>
25 cananian 1.1.2.1      *  offset needed to access a given <b>non-static</b> field.
26 cananian 1.1.2.1      * @param dst
27 cananian 1.1.2.1      *        the <code>Temp</code> in which to store the computed offset.
28 cananian 1.1.2.1      * @param field
29 cananian 1.1.2.1      *        the <code>HField</code> whose offset to compute.
30 cananian 1.1.2.1      */
31 cananian 1.1.2.1     public PFOFFSET(LowQuadFactory qf, HCodeElement source,
32 cananian 1.1.2.1                     final Temp dst, final HField field) {
33 cananian 1.1.2.1         super(qf, source, dst);
34 cananian 1.1.2.1         this.field = field;
35 cananian 1.3.2.1         assert field!=null && !field.isStatic();
36 cananian 1.1.2.1     }
37 cananian 1.1.2.1     // ACCESSOR METHODS:
38 cananian 1.1.2.1     /** Returns the field whose offset is computed. */
39 cananian 1.1.2.1     public HField field() { return field; }
40 cananian 1.1.2.1 
41 cananian 1.1.2.1     public int kind() { return LowQuadKind.PFOFFSET; }
42 cananian 1.1.2.1 
43 cananian 1.1.2.1     public harpoon.IR.Quads.Quad rename(harpoon.IR.Quads.QuadFactory qf,
44 cananian 1.1.2.1                                         TempMap defMap, TempMap useMap) {
45 cananian 1.1.2.1         return new PFOFFSET((LowQuadFactory)qf, this,
46 cananian 1.1.2.1                             map(defMap, dst), field);
47 cananian 1.1.2.1     }
48 cananian 1.1.2.1 
49 cananian 1.1.2.2     void accept(LowQuadVisitor v) { v.visit(this); }
50 cananian 1.5         <T> T accept(LowQuadValueVisitor<T> v) { return v.visit(this); }
51 cananian 1.1.2.1 
52 cananian 1.1.2.1     public String toString() {
53 cananian 1.1.2.1         return dst.toString() + " = PFOFFSET " +
54 cananian 1.1.2.1             field.getDeclaringClass().getName() + "." + field.getName();
55 cananian 1.1.2.1     }
56 cananian 1.2     }