01: /*
02: *
03: *
04: * Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package components;
28:
29: import java.io.DataOutput;
30: import java.io.DataInput;
31: import java.io.IOException;
32: import util.DataFormatException;
33: import jcc.Const;
34:
35: /*
36: * A class to represent the StackMap attribute of a method's code.
37: */
38:
39: public class StackMapAttribute extends Attribute {
40: public StackMapFrame data[];
41:
42: public StackMapAttribute(UnicodeConstant name, int l,
43: StackMapFrame d[]) {
44: super (name, l);
45: this .data = d;
46: }
47:
48: public void externalize(ConstantPool p) {
49: super .externalize(p);
50: for (int i = 0; i < data.length; i++) {
51: data[i].externalize(p);
52: }
53: }
54:
55: protected int writeData(DataOutput o) throws IOException {
56: int length = 2;
57: o.writeShort(data.length);
58: for (int i = 0; i < data.length; i++) {
59: length += data[i].writeData(o);
60: }
61: return length;
62: }
63:
64: public void countConstantReferences(boolean isRelocatable) {
65: super .countConstantReferences(isRelocatable);
66: for (int i = 0; i < data.length; i++) {
67: data[i].countConstantReferences(isRelocatable);
68: }
69: }
70:
71: public static Attribute readAttribute(DataInput i,
72: ConstantObject globals[]) throws IOException {
73: UnicodeConstant name;
74: name = (UnicodeConstant) globals[i.readUnsignedShort()];
75: return finishReadAttribute(i, name, globals);
76: }
77:
78: //
79: // for those cases where we already read the name index
80: // and know that its not something requiring special handling.
81: //
82: public static Attribute finishReadAttribute(DataInput in,
83: UnicodeConstant name, ConstantObject globals[])
84: throws IOException {
85: int length = in.readInt();
86: // Read the number of frames
87: int n = in.readUnsignedShort();
88: StackMapFrame d[] = new StackMapFrame[n];
89: // Read each frame
90: for (int i = 0; i < n; i++) {
91: d[i] = new StackMapFrame(in, globals);
92: }
93: return new StackMapAttribute(name, length, d);
94: }
95:
96: }
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