Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: src/share/classes/com/sun/tools/classfile/Code_attribute.java

src/share/classes/com/sun/tools/classfile/Code_attribute.java

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1 /*
2 * Copyright 2007 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package com.sun.tools.classfile;
27
28 import java.io.IOException;
29
30 /**
31 * See JVMS3, section 4.8.3.
32 *
33 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
34 * you write code that depends on this, you do so at your own risk.
35 * This code and its internal interfaces are subject to change or
36 * deletion without notice.</b>
37 */
38 public class Code_attribute extends Attribute {
39 public class InvalidIndex extends AttributeException {
40 InvalidIndex(int index) {
41 this.index = index;
42 }
43
44 @Override
45 public String getMessage() {
46 // i18n
47 return "invalid index " + index + " in Code attribute";
48 }
49
50 public final int index;
51 }
52
53 Code_attribute(ClassReader cr, int name_index, int length)
54 throws IOException, ConstantPoolException {
55 super(name_index, length);
56 max_stack = cr.readUnsignedShort();
57 max_locals = cr.readUnsignedShort();
58 code_length = cr.readInt();
59 code = new byte[code_length];
60 cr.readFully(code);
61 exception_table_langth = cr.readUnsignedShort();
62 exception_table = new Exception_data[exception_table_langth];
63 for (int i = 0; i < exception_table_langth; i++)
64 exception_table[i] = new Exception_data(cr);
65 attributes = new Attributes(cr);
66 }
67
68 public int getByte(int offset) throws InvalidIndex {
69 if (offset < 0 || offset >= code.length)
70 throw new InvalidIndex(offset);
71 return code[offset];
72 }
73
74 public int getUnsignedByte(int offset) throws InvalidIndex {
75 if (offset < 0 || offset >= code.length)
76 throw new InvalidIndex(offset);
77 return code[offset] & 0xff;
78 }
79
80 public int getShort(int offset) throws InvalidIndex {
81 if (offset < 0 || offset + 1 >= code.length)
82 throw new InvalidIndex(offset);
83 return (code[offset] << 8) | (code[offset + 1] & 0xFF);
84 }
85
86 public int getUnsignedShort(int offset) throws InvalidIndex {
87 if (offset < 0 || offset + 1 >= code.length)
88 throw new InvalidIndex(offset);
89 return ((code[offset] << 8) | (code[offset + 1] & 0xFF)) & 0xFFFF;
90 }
91
92 public int getInt(int offset) throws InvalidIndex {
93 if (offset < 0 || offset + 3 >= code.length)
94 throw new InvalidIndex(offset);
95 return (getShort(offset) << 16) | (getShort(offset + 2) & 0xFFFF);
96 }
97
98 public <R, D> R accept(Visitor<R, D> visitor, D data) {
99 return visitor.visitCode(this, data);
100 }
101
102 public final int max_stack;
103 public final int max_locals;
104 public final int code_length;
105 public final byte[] code;
106 public final int exception_table_langth;
107 public final Exception_data[] exception_table;
108 public final Attributes attributes;
109
110 public class Exception_data {
111 Exception_data(ClassReader cr) throws IOException {
112 start_pc = cr.readUnsignedShort();
113 end_pc = cr.readUnsignedShort();
114 handler_pc = cr.readUnsignedShort();
115 catch_type = cr.readUnsignedShort();
116 }
117
118 public final int start_pc;
119 public final int end_pc;
120 public final int handler_pc;
121 public final int catch_type;
122 }
123 }

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