| /* |
| * Copyright (c) 2007, 2013, 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. |
| * |
| * <p><b>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.</b> |
| */ |
| public class Code_attribute extends Attribute { |
| public static 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_length = cr.readUnsignedShort(); |
| exception_table = new Exception_data[exception_table_length]; |
| for (int i = 0; i < exception_table_length; 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 <R, D> R accept(Visitor<R, D> visitor, D data) { |
| return visitor.visitCode(this, data); |
| } |
| |
| public Iterable<Instruction> getInstructions() { |
| return () -> new Iterator<Instruction>() { |
| |
| public boolean hasNext() { |
| return (next != null); |
| } |
| |
| public Instruction next() { |
| if (next == null) |
| throw new NoSuchElementException(); |
| |
| current = next; |
| pc += current.length(); |
| next = (pc < code.length ? new Instruction(code, pc) : null); |
| return current; |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException("Not supported."); |
| } |
| |
| Instruction current = null; |
| int pc = 0; |
| Instruction next = new Instruction(code, pc); |
| |
| }; |
| } |
| |
| public final int max_stack; |
| public final int max_locals; |
| public final int code_length; |
| public final byte[] code; |
| public final int exception_table_length; |
| public final Exception_data[] exception_table; |
| public final Attributes attributes; |
| |
| public static class Exception_data { |
| Exception_data(ClassReader cr) throws IOException { |
| start_pc = cr.readUnsignedShort(); |
| end_pc = cr.readUnsignedShort(); |
| handler_pc = cr.readUnsignedShort(); |
| catch_type = cr.readUnsignedShort(); |
| } |
| |
| public final int start_pc; |
| public final int end_pc; |
| public final int handler_pc; |
| public final int catch_type; |
| } |
| } |