1 /*
2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.classfile;
27
28 import java.io.IOException;
29
30 /**
31 * See JVMS 4.7.21
32 * http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.7.21
33 *
34 * <p><b>This is NOT part of any supported API.
35 * If you write code that depends on this, you do so at your own risk.
36 * This code and its internal interfaces are subject to change or
37 * deletion without notice.</b>
38 */
39 public class BootstrapMethods_attribute extends Attribute {
40 public final BootstrapMethodSpecifier[] bootstrap_method_specifiers;
41
42 BootstrapMethods_attribute(ClassReader cr, int name_index, int length)
43 throws IOException, AttributeException {
44 super(name_index, length);
45 int bootstrap_method_count = cr.readUnsignedShort();
46 bootstrap_method_specifiers = new BootstrapMethodSpecifier[bootstrap_method_count];
47 for (int i = 0; i < bootstrap_method_specifiers.length; i++)
48 bootstrap_method_specifiers[i] = new BootstrapMethodSpecifier(cr);
49 }
50
51 public BootstrapMethods_attribute(int name_index, BootstrapMethodSpecifier[] bootstrap_method_specifiers) {
52 super(name_index, length(bootstrap_method_specifiers));
53 this.bootstrap_method_specifiers = bootstrap_method_specifiers;
54 }
55
56 public static int length(BootstrapMethodSpecifier[] bootstrap_method_specifiers) {
57 int n = 2;
58 for (BootstrapMethodSpecifier b : bootstrap_method_specifiers)
59 n += b.length();
60 return n;
61 }
62
63 @Override
64 public <R, P> R accept(Visitor<R, P> visitor, P p) {
65 return visitor.visitBootstrapMethods(this, p);
66 }
67
68 public static class BootstrapMethodSpecifier {
69 public int bootstrap_method_ref;
70 public int[] bootstrap_arguments;
71
72 public BootstrapMethodSpecifier(int bootstrap_method_ref, int[] bootstrap_arguments) {
73 this.bootstrap_method_ref = bootstrap_method_ref;
74 this.bootstrap_arguments = bootstrap_arguments;
75 }
76 BootstrapMethodSpecifier(ClassReader cr) throws IOException {
77 bootstrap_method_ref = cr.readUnsignedShort();
78 int method_count = cr.readUnsignedShort();
79 bootstrap_arguments = new int[method_count];
80 for (int i = 0; i < bootstrap_arguments.length; i++) {
81 bootstrap_arguments[i] = cr.readUnsignedShort();
82 }
83 }
84
85 int length() {
86 // u2 (method_ref) + u2 (argc) + u2 * argc
87 return 2 + 2 + (bootstrap_arguments.length * 2);
88 }
89 }
90 }