1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/classfile/Code_attribute.java Tue Jun 03 13:26:47 2008 -0700
1.3 @@ -0,0 +1,123 @@
1.4 +/*
1.5 + * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Sun designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Sun in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.25 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.26 + * have any questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.classfile;
1.30 +
1.31 +import java.io.IOException;
1.32 +
1.33 +/**
1.34 + * See JVMS3, section 4.8.3.
1.35 + *
1.36 + * <p><b>This is NOT part of any API supported by Sun Microsystems. If
1.37 + * you write code that depends on this, you do so at your own risk.
1.38 + * This code and its internal interfaces are subject to change or
1.39 + * deletion without notice.</b>
1.40 + */
1.41 +public class Code_attribute extends Attribute {
1.42 + public class InvalidIndex extends AttributeException {
1.43 + InvalidIndex(int index) {
1.44 + this.index = index;
1.45 + }
1.46 +
1.47 + @Override
1.48 + public String getMessage() {
1.49 + // i18n
1.50 + return "invalid index " + index + " in Code attribute";
1.51 + }
1.52 +
1.53 + public final int index;
1.54 + }
1.55 +
1.56 + Code_attribute(ClassReader cr, int name_index, int length)
1.57 + throws IOException, ConstantPoolException {
1.58 + super(name_index, length);
1.59 + max_stack = cr.readUnsignedShort();
1.60 + max_locals = cr.readUnsignedShort();
1.61 + code_length = cr.readInt();
1.62 + code = new byte[code_length];
1.63 + cr.readFully(code);
1.64 + exception_table_langth = cr.readUnsignedShort();
1.65 + exception_table = new Exception_data[exception_table_langth];
1.66 + for (int i = 0; i < exception_table_langth; i++)
1.67 + exception_table[i] = new Exception_data(cr);
1.68 + attributes = new Attributes(cr);
1.69 + }
1.70 +
1.71 + public int getByte(int offset) throws InvalidIndex {
1.72 + if (offset < 0 || offset >= code.length)
1.73 + throw new InvalidIndex(offset);
1.74 + return code[offset];
1.75 + }
1.76 +
1.77 + public int getUnsignedByte(int offset) throws InvalidIndex {
1.78 + if (offset < 0 || offset >= code.length)
1.79 + throw new InvalidIndex(offset);
1.80 + return code[offset] & 0xff;
1.81 + }
1.82 +
1.83 + public int getShort(int offset) throws InvalidIndex {
1.84 + if (offset < 0 || offset + 1 >= code.length)
1.85 + throw new InvalidIndex(offset);
1.86 + return (code[offset] << 8) | (code[offset + 1] & 0xFF);
1.87 + }
1.88 +
1.89 + public int getUnsignedShort(int offset) throws InvalidIndex {
1.90 + if (offset < 0 || offset + 1 >= code.length)
1.91 + throw new InvalidIndex(offset);
1.92 + return ((code[offset] << 8) | (code[offset + 1] & 0xFF)) & 0xFFFF;
1.93 + }
1.94 +
1.95 + public int getInt(int offset) throws InvalidIndex {
1.96 + if (offset < 0 || offset + 3 >= code.length)
1.97 + throw new InvalidIndex(offset);
1.98 + return (getShort(offset) << 16) | (getShort(offset + 2) & 0xFFFF);
1.99 + }
1.100 +
1.101 + public <R, D> R accept(Visitor<R, D> visitor, D data) {
1.102 + return visitor.visitCode(this, data);
1.103 + }
1.104 +
1.105 + public final int max_stack;
1.106 + public final int max_locals;
1.107 + public final int code_length;
1.108 + public final byte[] code;
1.109 + public final int exception_table_langth;
1.110 + public final Exception_data[] exception_table;
1.111 + public final Attributes attributes;
1.112 +
1.113 + public class Exception_data {
1.114 + Exception_data(ClassReader cr) throws IOException {
1.115 + start_pc = cr.readUnsignedShort();
1.116 + end_pc = cr.readUnsignedShort();
1.117 + handler_pc = cr.readUnsignedShort();
1.118 + catch_type = cr.readUnsignedShort();
1.119 + }
1.120 +
1.121 + public final int start_pc;
1.122 + public final int end_pc;
1.123 + public final int handler_pc;
1.124 + public final int catch_type;
1.125 + }
1.126 +}
