jjg@46: /* ohair@554: * Copyright (c) 2007, 2009, Oracle and/or its affiliates. All rights reserved. jjg@46: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. jjg@46: * jjg@46: * This code is free software; you can redistribute it and/or modify it jjg@46: * under the terms of the GNU General Public License version 2 only, as ohair@554: * published by the Free Software Foundation. Oracle designates this jjg@46: * particular file as subject to the "Classpath" exception as provided ohair@554: * by Oracle in the LICENSE file that accompanied this code. jjg@46: * jjg@46: * This code is distributed in the hope that it will be useful, but WITHOUT jjg@46: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or jjg@46: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License jjg@46: * version 2 for more details (a copy is included in the LICENSE file that jjg@46: * accompanied this code). jjg@46: * jjg@46: * You should have received a copy of the GNU General Public License version jjg@46: * 2 along with this work; if not, write to the Free Software Foundation, jjg@46: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. jjg@46: * ohair@554: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA ohair@554: * or visit www.oracle.com if you need additional information or have any ohair@554: * questions. jjg@46: */ jjg@46: jjg@46: package com.sun.tools.classfile; jjg@46: jjg@46: import java.io.IOException; jjg@255: import java.util.Iterator; jjg@255: import java.util.NoSuchElementException; jjg@46: jjg@46: /** jjh@972: * See JVMS, section 4.8.3. jjg@46: * jjg@581: *
This is NOT part of any supported API.
jjg@581: * If you write code that depends on this, you do so at your own risk.
jjg@46: * This code and its internal interfaces are subject to change or
jjg@46: * deletion without notice.
jjg@46: */
jjg@46: public class Code_attribute extends Attribute {
jjg@46: public class InvalidIndex extends AttributeException {
jjg@198: private static final long serialVersionUID = -8904527774589382802L;
jjg@46: InvalidIndex(int index) {
jjg@46: this.index = index;
jjg@46: }
jjg@46:
jjg@46: @Override
jjg@46: public String getMessage() {
jjg@46: // i18n
jjg@46: return "invalid index " + index + " in Code attribute";
jjg@46: }
jjg@46:
jjg@46: public final int index;
jjg@46: }
jjg@46:
jjg@46: Code_attribute(ClassReader cr, int name_index, int length)
jjg@46: throws IOException, ConstantPoolException {
jjg@46: super(name_index, length);
jjg@46: max_stack = cr.readUnsignedShort();
jjg@46: max_locals = cr.readUnsignedShort();
jjg@46: code_length = cr.readInt();
jjg@46: code = new byte[code_length];
jjg@46: cr.readFully(code);
jjg@46: exception_table_langth = cr.readUnsignedShort();
jjg@46: exception_table = new Exception_data[exception_table_langth];
jjg@46: for (int i = 0; i < exception_table_langth; i++)
jjg@46: exception_table[i] = new Exception_data(cr);
jjg@46: attributes = new Attributes(cr);
jjg@46: }
jjg@46:
jjg@46: public int getByte(int offset) throws InvalidIndex {
jjg@46: if (offset < 0 || offset >= code.length)
jjg@46: throw new InvalidIndex(offset);
jjg@46: return code[offset];
jjg@46: }
jjg@46:
jjg@46: public int getUnsignedByte(int offset) throws InvalidIndex {
jjg@46: if (offset < 0 || offset >= code.length)
jjg@46: throw new InvalidIndex(offset);
jjg@46: return code[offset] & 0xff;
jjg@46: }
jjg@46:
jjg@46: public int getShort(int offset) throws InvalidIndex {
jjg@46: if (offset < 0 || offset + 1 >= code.length)
jjg@46: throw new InvalidIndex(offset);
jjg@46: return (code[offset] << 8) | (code[offset + 1] & 0xFF);
jjg@46: }
jjg@46:
jjg@46: public int getUnsignedShort(int offset) throws InvalidIndex {
jjg@46: if (offset < 0 || offset + 1 >= code.length)
jjg@46: throw new InvalidIndex(offset);
jjg@46: return ((code[offset] << 8) | (code[offset + 1] & 0xFF)) & 0xFFFF;
jjg@46: }
jjg@46:
jjg@46: public int getInt(int offset) throws InvalidIndex {
jjg@46: if (offset < 0 || offset + 3 >= code.length)
jjg@46: throw new InvalidIndex(offset);
jjg@46: return (getShort(offset) << 16) | (getShort(offset + 2) & 0xFFFF);
jjg@46: }
jjg@46:
jjg@46: public