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package org.aspectj.apache.bcel.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.aspectj.apache.bcel.Constants;
/**
* This class represents a chunk of Java byte code contained in a method. It is instantiated by the
* Attribute.readAttribute() method. A Code attribute contains informations about operand stack, local variables,
* byte code and the exceptions handled within this method.
*
* This attribute has attributes itself, namely LineNumberTable which is used for debugging purposes and
* LocalVariableTable which contains information about the local variables.
*
* @version $Id: Code.java,v 1.9 2009/10/05 17:35:36 aclement Exp $
* @author M. Dahm
* @see Attribute
* @see CodeException
* @see LineNumberTable
* @see LocalVariableTable
*/
public final class Code extends Attribute {
private int maxStack; // Maximum size of stack used by this method
private int maxLocals; // Number of local variables
private byte[] code; // Actual byte code
private CodeException[] exceptionTable;
private Attribute[] attributes;
private static final CodeException[] NO_EXCEPTIONS = new CodeException[] {};
/**
* Initialize from another object. Note that both objects use the same references (shallow copy). Use copy() for a physical
* copy.
*/
public Code(Code c) {
this(c.getNameIndex(), c.getLength(), c.getMaxStack(), c.getMaxLocals(), c.getCode(), c.getExceptionTable(), c
.getAttributes(), c.getConstantPool());
}
Code(int name_index, int length, DataInputStream file, ConstantPool constant_pool) throws IOException {
// Initialize with some default values which will be overwritten later
this(name_index, length, file.readUnsignedShort(), file.readUnsignedShort(), (byte[]) null, (CodeException[]) null,
(Attribute[]) null, constant_pool);
int len = file.readInt();
code = new byte[len]; // Read byte code
file.readFully(code);
/*
* Read exception table that contains all regions where an exception handler is active, i.e., a try { ... } catch() block.
*/
len = file.readUnsignedShort();
if (len == 0) {
exceptionTable = NO_EXCEPTIONS;
} else {
exceptionTable = new CodeException[len];
for (int i = 0; i < len; i++) {
exceptionTable[i] = new CodeException(file);
}
}
// Read all attributes, eg: LineNumberTable, LocalVariableTable
attributes = AttributeUtils.readAttributes(file, constant_pool);
/*
* Adjust length, because of setAttributes in this(), s.b. length is incorrect, because it didn't take the internal
* attributes into account yet! Very subtle bug, fixed in 3.1.1.
*/
this.length = length;
}
/**
* @param name_index Index pointing to the name Code
* @param length Content length in bytes
* @param max_stack Maximum size of stack
* @param max_locals Number of local variables
* @param code Actual byte code
* @param exception_table Table of handled exceptions
* @param attributes Attributes of code: LineNumber or LocalVariable
* @param constant_pool Array of constants
*/
public Code(int name_index, int length, int max_stack, int max_locals, byte[] code, CodeException[] exception_table,
Attribute[] attributes, ConstantPool constant_pool) {
super(Constants.ATTR_CODE, name_index, length, constant_pool);
this.maxStack = max_stack;
this.maxLocals = max_locals;
setCode(code);
setExceptionTable(exception_table);
setAttributes(attributes); // Overwrites length!
}
/**
* Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the
* hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
@Override
public void accept(ClassVisitor v) {
v.visitCode(this);
}
/**
* Dump code attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
@Override
public final void dump(DataOutputStream file) throws IOException {
super.dump(file);
file.writeShort(maxStack);
file.writeShort(maxLocals);
file.writeInt(code.length);
file.write(code, 0, code.length);
file.writeShort(exceptionTable.length);
for (int i = 0; i < exceptionTable.length; i++) {
exceptionTable[i].dump(file);
}
file.writeShort(attributes.length);
for (int i = 0; i < attributes.length; i++) {
attributes[i].dump(file);
}
}
/**
* @return Collection of code attributes.
* @see Attribute
*/
public final Attribute[] getAttributes() {
return attributes;
}
/**
* @return LineNumberTable of Code, if it has one
*/
public LineNumberTable getLineNumberTable() {
for (int i = 0; i < attributes.length; i++) {
if (attributes[i].tag == Constants.ATTR_LINE_NUMBER_TABLE) {
return (LineNumberTable) attributes[i];
}
}
return null;
}
/**
* @return LocalVariableTable of Code, if it has one
*/
public LocalVariableTable getLocalVariableTable() {
for (int i = 0; i < attributes.length; i++) {
if (attributes[i].tag == Constants.ATTR_LOCAL_VARIABLE_TABLE) {
return (LocalVariableTable) attributes[i];
}
}
return null;
}
/**
* @return Actual byte code of the method.
*/
public final byte[] getCode() {
return code;
}
/**
* @return Table of handled exceptions.
* @see CodeException
*/
public final CodeException[] getExceptionTable() {
return exceptionTable;
}
/**
* @return Number of local variables.
*/
public final int getMaxLocals() {
return maxLocals;
}
/**
* @return Maximum size of stack used by this method.
*/
public final int getMaxStack() {
return maxStack;
}
/**
* @return the internal length of this code attribute (minus the first 6 bytes) and excluding all its attributes
*/
private final int getInternalLength() {
return 2 /* max_stack */+ 2 /* max_locals */+ 4 /* code length */
+ (code == null ? 0 : code.length) /* byte-code */
+ 2 /* exception-table length */
+ 8 * (exceptionTable == null ? 0 : exceptionTable.length) /* exception table */
+ 2 /* attributes count */;
}
/**
* @return the full size of this code attribute, minus its first 6 bytes, including the size of all its contained attributes
*/
private final int calculateLength() {
int len = 0;
if (attributes != null) {
for (int i = 0; i < attributes.length; i++) {
len += attributes[i].length + 6 /* attribute header size */;
}
}
return len + getInternalLength();
}
/**
* @param attributes.
*/
public final void setAttributes(Attribute[] attributes) {
this.attributes = attributes;
length = calculateLength(); // Adjust length
}
/**
* @param code byte code
*/
public final void setCode(byte[] code) {
this.code = code;
}
/**
* @param exception_table exception table
*/
public final void setExceptionTable(CodeException[] exception_table) {
this.exceptionTable = exception_table;
}
/**
* @param max_locals maximum number of local variables
*/
public final void setMaxLocals(int max_locals) {
this.maxLocals = max_locals;
}
/**
* @param max_stack maximum stack size
*/
public final void setMaxStack(int max_stack) {
this.maxStack = max_stack;
}
/**
* @return String representation of code chunk.
*/
public final String toString(boolean verbose) {
StringBuffer buf;
buf = new StringBuffer("Code(max_stack = " + maxStack + ", max_locals = " + maxLocals + ", code_length = " + code.length
+ ")\n" + Utility.codeToString(code, cpool, 0, -1, verbose));
if (exceptionTable.length > 0) {
buf.append("\nException handler(s) = \n" + "From\tTo\tHandler\tType\n");
for (int i = 0; i < exceptionTable.length; i++) {
buf.append(exceptionTable[i].toString(cpool, verbose) + "\n");
}
}
if (attributes.length > 0) {
buf.append("\nAttribute(s) = \n");
for (int i = 0; i < attributes.length; i++) {
buf.append(attributes[i].toString() + "\n");
}
}
return buf.toString();
}
/**
* @return String representation of code chunk.
*/
@Override
public final String toString() {
return toString(true);
}
// /**
// * @return deep copy of this attribute
// */
// public Attribute copy(ConstantPool constant_pool) {
// Code c = (Code)clone();
// c.code = (byte[])code.clone();
// c.cpool = constant_pool;
//
// c.exceptionTable = new CodeException[exceptionTable.length];
// for(int i=0; i < exceptionTable.length; i++)
// c.exceptionTable[i] = exceptionTable[i].copy();
//
// c.attributes = new Attribute[attributes.length];
// for(int i=0; i < attributes.length; i++)
// c.attributes[i] = attributes[i].copy(constant_pool);
//
// return c;
// }
/**
* Returns the same as toString(true) except that the attribute information isn't included (line numbers). Can be used to check
* whether two pieces of code are equivalent.
*/
public String getCodeString() {
StringBuffer codeString = new StringBuffer();
codeString.append("Code(max_stack = ").append(maxStack);
codeString.append(", max_locals = ").append(maxLocals);
codeString.append(", code_length = ").append(code.length).append(")\n");
codeString.append(Utility.codeToString(code, cpool, 0, -1, true));
if (exceptionTable.length > 0) {
codeString.append("\n").append("Exception entries = ").append(exceptionTable.length).append("\n");
for (int i = 0; i < exceptionTable.length; i++) {
CodeException exc = exceptionTable[i];
int type = exc.getCatchType();
String name = "finally";
if (type != 0) {
name = this.cpool.getConstantString(type, Constants.CONSTANT_Class);
}
codeString.append(name).append("[");
codeString.append(exc.getStartPC()).append(">").append(exc.getEndPC()).append("]\n");
}
}
return codeString.toString();
}
}
