1 cananian 1.1.4.1 // DataStaticFields.java, created Mon Oct 11 23:46:16 1999 by cananian
2 cananian 1.1.4.1 // Copyright (C) 1999 C. Scott Ananian <cananian@alumni.princeton.edu>
3 cananian 1.1.4.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.4.1 package harpoon.Backend.Runtime1;
5 cananian 1.1.4.1
6 cananian 1.1.4.1 import harpoon.Backend.Generic.Frame;
7 cananian 1.1.4.3 import harpoon.Backend.Maps.FieldMap;
8 cananian 1.1.4.1 import harpoon.Backend.Maps.NameMap;
9 cananian 1.1.4.1 import harpoon.ClassFile.HClass;
10 cananian 1.1.4.1 import harpoon.ClassFile.HDataElement;
11 cananian 1.1.4.1 import harpoon.ClassFile.HField;
12 cananian 1.1.4.1 import harpoon.IR.Tree.Exp;
13 cananian 1.1.4.1 import harpoon.IR.Tree.Stm;
14 cananian 1.1.4.3 import harpoon.IR.Tree.ALIGN;
15 cananian 1.1.4.1 import harpoon.IR.Tree.CONST;
16 cananian 1.1.4.4 import harpoon.IR.Tree.DATUM;
17 cananian 1.1.4.1 import harpoon.IR.Tree.LABEL;
18 cananian 1.1.4.1 import harpoon.IR.Tree.NAME;
19 cananian 1.1.4.1 import harpoon.IR.Tree.SEGMENT;
20 cananian 1.1.4.1 import harpoon.Util.Util;
21 cananian 1.1.4.1
22 cananian 1.1.4.1 import java.util.ArrayList;
23 cananian 1.1.4.1 import java.util.Arrays;
24 cananian 1.1.4.3 import java.util.Collections;
25 cananian 1.1.4.3 import java.util.Comparator;
26 cananian 1.1.4.1 import java.util.HashSet;
27 cananian 1.1.4.1 import java.util.List;
28 cananian 1.1.4.1 import java.util.Set;
29 cananian 1.1.4.1 /**
30 cananian 1.1.4.1 * <code>DataStaticFields</code> lays out the static fields of a class.
31 cananian 1.1.4.1 *
32 cananian 1.1.4.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
33 cananian 1.5 * @version $Id: DataStaticFields.java,v 1.5 2003/10/21 02:11:02 cananian Exp $
34 cananian 1.1.4.1 */
35 cananian 1.1.4.1 public class DataStaticFields extends Data {
36 cananian 1.1.4.1 final NameMap m_nm;
37 cananian 1.1.4.3 final FieldMap m_fm;
38 cananian 1.1.4.1
39 cananian 1.1.4.1 /** Creates a <code>DataStaticFields</code>. */
40 cananian 1.1.4.1 public DataStaticFields(Frame f, HClass hc) {
41 cananian 1.1.4.1 super("static-fields", hc, f);
42 cananian 1.1.4.5 this.m_nm = f.getRuntime().getNameMap();
43 cananian 1.1.4.3 // note that technically this is a *class* field map, and so
44 cananian 1.1.4.3 // we can't be sure that it will work on static fields. but
45 cananian 1.1.4.3 // in fact, we wrote the code, so we know it will. Slight
46 cananian 1.1.4.3 // violation of abstraction, but it makes everything more
47 cananian 1.1.4.3 // maintainable *not* to duplicate the code here.
48 cananian 1.1.4.5 this.m_fm = ((TreeBuilder)f.getRuntime().getTreeBuilder()).cfm;
49 cananian 1.5 this.root = build(hc, f.pointersAreLong());
50 cananian 1.1.4.1 }
51 cananian 1.5 private HDataElement build(HClass hc, boolean pointersAreLong) {
52 cananian 1.1.4.3 HField[] fields = (HField[]) hc.getDeclaredFields().clone();
53 cananian 1.1.4.3 // first, sort fields by size to pack 'em in as tight as we can.
54 cananian 1.1.4.3 Collections.sort(Arrays.asList(fields), new Comparator() {
55 cananian 1.1.4.3 public int compare(Object o1, Object o2) {
56 cananian 1.1.4.3 return m_fm.fieldSize((HField)o1) - m_fm.fieldSize((HField)o2);
57 cananian 1.1.4.3 }
58 cananian 1.1.4.3 });
59 cananian 1.1.4.3 List stmlist = new ArrayList(2+3*fields.length/*at most*/);
60 cananian 1.1.4.1 // first do static fields with non-primitive type
61 cananian 1.1.4.1 stmlist.add(new SEGMENT(tf, null, SEGMENT.STATIC_OBJECTS));
62 cananian 1.5 stmlist.add(new ALIGN(tf, null, // align pointer fields to pointer size
63 cananian 1.5 pointersAreLong ? 8 : 4));
64 cananian 1.1.4.1 for (int i=0; i<fields.length; i++) {
65 cananian 1.1.4.1 if (!fields[i].isStatic() || fields[i].getType().isPrimitive())
66 cananian 1.1.4.1 continue;
67 cananian 1.1.4.1 stmlist.add(new LABEL(tf, null, m_nm.label(fields[i]), true));
68 cananian 1.1.4.4 stmlist.add(_DATUM(new CONST(tf, null))); // null pointer.
69 cananian 1.1.4.1 }
70 cananian 1.1.4.1 // next do static fields with primitive types
71 cananian 1.1.4.1 stmlist.add(new SEGMENT(tf, null, SEGMENT.STATIC_PRIMITIVES));
72 cananian 1.1.4.1 for (int i=0; i<fields.length; i++) {
73 cananian 1.1.4.1 if (!fields[i].isStatic() || !fields[i].getType().isPrimitive())
74 cananian 1.1.4.1 continue;
75 cananian 1.1.4.3 // align to field size.
76 cananian 1.1.4.3 stmlist.add(new ALIGN(tf, null, m_fm.fieldSize(fields[i])));
77 cananian 1.1.4.1 stmlist.add(new LABEL(tf, null, m_nm.label(fields[i]), true));
78 cananian 1.1.4.4 stmlist.add(_DATUM(fieldInitializer(fields[i])));
79 cananian 1.1.4.1 }
80 cananian 1.1.4.1 return (HDataElement) Stm.toStm(stmlist);
81 cananian 1.1.4.1 }
82 cananian 1.1.4.1 Exp fieldInitializer(HField f) {
83 cananian 1.1.4.1 HClass ty = f.getType();
84 cananian 1.3.2.1 assert ty.isPrimitive();
85 cananian 1.1.4.1 Object cvo = f.getConstant();
86 cananian 1.1.4.1 if (ty==HClass.Int)
87 cananian 1.1.4.1 return new CONST(tf, null, (int)
88 cananian 1.1.4.1 (cvo==null?0:((Integer)cvo).intValue()));
89 cananian 1.1.4.1 if (ty==HClass.Long)
90 cananian 1.1.4.1 return new CONST(tf, null, (long)
91 cananian 1.1.4.1 (cvo==null?0:((Long)cvo).longValue()));
92 cananian 1.1.4.1 if (ty==HClass.Float)
93 cananian 1.1.4.1 return new CONST(tf, null, (float)
94 cananian 1.1.4.1 (cvo==null?0:((Float)cvo).floatValue()));
95 cananian 1.1.4.1 if (ty==HClass.Double)
96 cananian 1.1.4.1 return new CONST(tf, null, (double)
97 cananian 1.1.4.1 (cvo==null?0:((Double)cvo).doubleValue()));
98 cananian 1.1.4.2 // sub-integer types represented by Integer wrapped values.
99 cananian 1.1.4.1 if (ty==HClass.Boolean)
100 cananian 1.1.4.1 return new CONST(tf, null, 8, false,
101 cananian 1.1.4.2 (cvo==null?0:((Number)cvo).intValue()));
102 cananian 1.1.4.1 if (ty==HClass.Byte)
103 cananian 1.1.4.1 return new CONST(tf, null, 8, true,
104 cananian 1.1.4.2 (cvo==null?0:((Number)cvo).intValue()));
105 cananian 1.1.4.1 if (ty==HClass.Char)
106 cananian 1.1.4.1 return new CONST(tf, null, 16, false,
107 cananian 1.1.4.2 (cvo==null?0:((Number)cvo).intValue()));
108 cananian 1.1.4.1 if (ty==HClass.Short)
109 cananian 1.1.4.1 return new CONST(tf, null, 16, true,
110 cananian 1.1.4.2 (cvo==null?0:((Number)cvo).intValue()));
111 cananian 1.1.4.1 throw new Error("Unknown primitive type");
112 cananian 1.1.4.1 }
113 cananian 1.2 }