/* * Copyright (c) 2007, 2009, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.tools.classfile; import java.io.IOException; import java.util.Iterator; import java.util.NoSuchElementException; /** * See JVMS, section 4.8.3. * *
This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public class Code_attribute extends Attribute {
public class InvalidIndex extends AttributeException {
private static final long serialVersionUID = -8904527774589382802L;
InvalidIndex(int index) {
this.index = index;
}
@Override
public String getMessage() {
// i18n
return "invalid index " + index + " in Code attribute";
}
public final int index;
}
Code_attribute(ClassReader cr, int name_index, int length)
throws IOException, ConstantPoolException {
super(name_index, length);
max_stack = cr.readUnsignedShort();
max_locals = cr.readUnsignedShort();
code_length = cr.readInt();
code = new byte[code_length];
cr.readFully(code);
exception_table_langth = cr.readUnsignedShort();
exception_table = new Exception_data[exception_table_langth];
for (int i = 0; i < exception_table_langth; i++)
exception_table[i] = new Exception_data(cr);
attributes = new Attributes(cr);
}
public int getByte(int offset) throws InvalidIndex {
if (offset < 0 || offset >= code.length)
throw new InvalidIndex(offset);
return code[offset];
}
public int getUnsignedByte(int offset) throws InvalidIndex {
if (offset < 0 || offset >= code.length)
throw new InvalidIndex(offset);
return code[offset] & 0xff;
}
public int getShort(int offset) throws InvalidIndex {
if (offset < 0 || offset + 1 >= code.length)
throw new InvalidIndex(offset);
return (code[offset] << 8) | (code[offset + 1] & 0xFF);
}
public int getUnsignedShort(int offset) throws InvalidIndex {
if (offset < 0 || offset + 1 >= code.length)
throw new InvalidIndex(offset);
return ((code[offset] << 8) | (code[offset + 1] & 0xFF)) & 0xFFFF;
}
public int getInt(int offset) throws InvalidIndex {
if (offset < 0 || offset + 3 >= code.length)
throw new InvalidIndex(offset);
return (getShort(offset) << 16) | (getShort(offset + 2) & 0xFFFF);
}
public