1 cananian 1.1.2.1 // Data.java, created Wed Sep 8 16:13:24 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.Backend.Runtime1;
5 cananian 1.1.2.1
6 cananian 1.1.2.1 import harpoon.Backend.Generic.Frame;
7 cananian 1.1.2.1 import harpoon.ClassFile.HClass;
8 cananian 1.1.2.1 import harpoon.ClassFile.HDataElement;
9 cananian 1.1.2.7 import harpoon.ClassFile.Linker;
10 cananian 1.1.2.1 import harpoon.IR.Tree.Exp;
11 cananian 1.1.2.5 import harpoon.IR.Tree.Stm;
12 cananian 1.1.2.5 import harpoon.IR.Tree.CONST;
13 cananian 1.1.2.6 import harpoon.IR.Tree.DATUM;
14 cananian 1.1.2.1 import harpoon.IR.Tree.NAME;
15 cananian 1.1.2.1 import harpoon.IR.Tree.Tree;
16 cananian 1.1.2.3 import harpoon.IR.Tree.Type;
17 cananian 1.1.2.1 import harpoon.Temp.Label;
18 cananian 1.1.2.1
19 cananian 1.1.2.1 import java.util.ArrayList;
20 cananian 1.1.2.5 import java.util.List;
21 cananian 1.1.2.1 /**
22 cananian 1.1.2.4 * <code>Data</code> is an abstract superclass with handy useful methods
23 cananian 1.1.2.4 * for the <code>harpoon.IR.Tree.Data</code> subclasses in
24 cananian 1.1.2.4 * <code>Runtime1</code>.
25 cananian 1.1.2.1 *
26 cananian 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
27 cananian 1.3 * @version $Id: Data.java,v 1.3 2002/04/10 03:03:20 cananian Exp $
28 cananian 1.1.2.1 */
29 cananian 1.1.2.1 public class Data extends harpoon.IR.Tree.Data {
30 cananian 1.1.2.7 final Linker linker;
31 cananian 1.1.2.1 final HClass hc;
32 wbeebee 1.1.2.8 // All subclasses should be able to set this.
33 wbeebee 1.1.2.8 protected HDataElement root = null;
34 cananian 1.1.2.1
35 cananian 1.1.2.1 /** Creates a <code>Data</code>. */
36 wbeebee 1.1.2.8 protected Data(String desc, HClass hc, Frame f) {
37 cananian 1.1.2.1 super(desc, f);
38 cananian 1.1.2.7 this.linker = f.getLinker();
39 cananian 1.1.2.1 this.hc = hc;
40 cananian 1.1.2.1 }
41 cananian 1.1.2.1 public HClass getHClass() { return hc; }
42 cananian 1.1.2.1 public HDataElement getRootElement() { return root; }
43 cananian 1.1.2.2
44 cananian 1.1.2.2 public int hashCode() { return hc.hashCode() ^ desc.hashCode(); }
45 cananian 1.1.2.1
46 cananian 1.1.2.1 /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*
47 cananian 1.1.2.1 * *
48 cananian 1.1.2.1 * Utility methods *
49 cananian 1.1.2.1 * *
50 cananian 1.1.2.1 *++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
51 cananian 1.1.2.1
52 cananian 1.2.2.1 protected DATUM _DATUM(Exp e) {
53 cananian 1.1.2.6 return new DATUM(tf, null, e);
54 cananian 1.1.2.1 }
55 cananian 1.1.2.1
56 cananian 1.2.2.1 protected DATUM _DATUM(Label l) {
57 cananian 1.1.2.6 return new DATUM(tf,null,new NAME(tf,null,l));
58 cananian 1.1.2.5 }
59 cananian 1.1.2.5
60 cananian 1.1.2.5 // UTF-8 handling methods -----------------------------------
61 cananian 1.1.2.5
62 cananian 1.1.2.5 /** Make a java-style UTF-8 encoded byte array for a string. */
63 cananian 1.1.2.5 public static byte[] toUTF8(String str) {
64 cananian 1.1.2.5 // first count how many bytes we'll need.
65 cananian 1.1.2.5 int len=0;
66 cananian 1.1.2.5 for (int i=0; i<str.length(); i++) {
67 cananian 1.1.2.5 int c = (int) str.charAt(i);
68 cananian 1.1.2.5 if (c >= 0x0001 && c <= 0x007f) len+=1; // one byte format
69 cananian 1.1.2.5 else if (c == 0 || (c >= 0x0080 && c <= 0x07FF)) len+=2; //two byte
70 cananian 1.1.2.5 else len += 3; // three byte format.
71 cananian 1.1.2.5 }
72 cananian 1.1.2.5 // allocate byte array for result.
73 cananian 1.1.2.5 byte[] r = new byte[len];
74 cananian 1.1.2.5 // now make the UTF-8 encoding.
75 cananian 1.1.2.5 len=0;
76 cananian 1.1.2.5 for (int i=0; i<str.length(); i++) {
77 cananian 1.1.2.5 int c = (int) str.charAt(i);
78 cananian 1.1.2.5 if (c >= 0x0001 && c <= 0x007f) { // one byte format
79 cananian 1.1.2.5 r[len++] = (byte) c;
80 cananian 1.1.2.5 } else if (c == 0 || (c >= 0x0080 && c <= 0x07FF)) { // two byte
81 cananian 1.1.2.5 r[len++] = (byte) (0xC0 | (c>>>6));
82 cananian 1.1.2.5 r[len++] = (byte) (0x80 | (c & 0x3F));
83 cananian 1.1.2.5 } else { // three byte format
84 cananian 1.1.2.5 r[len++] = (byte) (0xE0 | (c>>>12));
85 cananian 1.1.2.5 r[len++] = (byte) (0x80 | ((c>>>6) & 0x3F));
86 cananian 1.1.2.5 r[len++] = (byte) (0x80 | (c & 0x3F));
87 cananian 1.1.2.5 }
88 cananian 1.1.2.5 }
89 cananian 1.1.2.5 // okay, done.
90 cananian 1.1.2.5 return r;
91 cananian 1.1.2.5 }
92 cananian 1.1.2.5
93 cananian 1.1.2.5 /* Return a <code>Stm</code> representing a string constant in UTF-8
94 cananian 1.1.2.5 * encoded form. */
95 cananian 1.1.2.5 protected Stm emitUtf8String(String str) {
96 cananian 1.1.2.5 byte[] bytes = toUTF8(str);
97 cananian 1.1.2.5 List stmlist = new ArrayList(bytes.length+1);
98 cananian 1.1.2.5 for (int i=0; i<bytes.length; i++)
99 cananian 1.1.2.6 stmlist.add(_DATUM(new CONST(tf, null, 8, false,
100 cananian 1.1.2.5 ((int)bytes[i])&0xFF)));
101 cananian 1.1.2.5 // null-terminate the string.
102 cananian 1.1.2.6 stmlist.add(_DATUM(new CONST(tf, null, 8, false, 0)));
103 cananian 1.1.2.5 return Stm.toStm(stmlist);
104 cananian 1.1.2.1 }
105 cananian 1.2 }