package com.sun.org.apache.bcel.internal.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 apache@apache.org.
*
* 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
* <http://www.apache.org/>.
*/
import com.sun.org.apache.bcel.internal.Constants;
import java.io.*;
/**
* This class represents a stack map entry recording the types of
* local variables and the the of stack items at a given byte code offset.
* See CLDC specification ÷5.3.1.2
*
* @version $Id: StackMapEntry.java,v 1.1.1.1 2001/10/29 20:00:03 jvanzyl Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
* @see StackMap
* @see StackMapType
*/
public final class StackMapEntry implements Cloneable {
private int byte_code_offset;
private int number_of_locals;
private StackMapType[] types_of_locals;
private int number_of_stack_items;
private StackMapType[] types_of_stack_items;
private ConstantPool constant_pool;
/**
* Construct object from file stream.
* @param file Input stream
* @throw IOException
*/
StackMapEntry(DataInputStream file, ConstantPool constant_pool) throws IOException
{
this(file.readShort(), file.readShort(), null, -1, null, constant_pool);
types_of_locals = new StackMapType[number_of_locals];
for(int i=0; i < number_of_locals; i++)
types_of_locals[i] = new StackMapType(file, constant_pool);
number_of_stack_items = file.readShort();
types_of_stack_items = new StackMapType[number_of_stack_items];
for(int i=0; i < number_of_stack_items; i++)
types_of_stack_items[i] = new StackMapType(file, constant_pool);
}
public StackMapEntry(int byte_code_offset, int number_of_locals,
StackMapType[] types_of_locals,
int number_of_stack_items,
StackMapType[] types_of_stack_items,
ConstantPool constant_pool) {
this.byte_code_offset = byte_code_offset;
this.number_of_locals = number_of_locals;
this.types_of_locals = types_of_locals;
this.number_of_stack_items = number_of_stack_items;
this.types_of_stack_items = types_of_stack_items;
this.constant_pool = constant_pool;
}
/**
* Dump stack map entry
*
* @param file Output file stream
* @throw IOException
*/
public final void dump(DataOutputStream file) throws IOException
{
file.writeShort(byte_code_offset);
file.writeShort(number_of_locals);
for(int i=0; i < number_of_locals; i++)
types_of_locals[i].dump(file);
file.writeShort(number_of_stack_items);
for(int i=0; i < number_of_stack_items; i++)
types_of_stack_items[i].dump(file);
}
/**
* @return String representation.
*/
public final String toString() {
StringBuffer buf = new StringBuffer("(offset=" + byte_code_offset);
if(number_of_locals > 0) {
buf.append(", locals={");
for(int i=0; i < number_of_locals; i++) {
buf.append(types_of_locals[i]);
if(i < number_of_locals - 1)
buf.append(", ");
}
buf.append("}");
}
if(number_of_stack_items > 0) {
buf.append(", stack items={");
for(int i=0; i < number_of_stack_items; i++) {
buf.append(types_of_stack_items[i]);
if(i < number_of_stack_items - 1)
buf.append(", ");
}
buf.append("}");
}
buf.append(")");
return buf.toString();
}
public void setByteCodeOffset(int b) { byte_code_offset = b; }
public int getByteCodeOffset() { return byte_code_offset; }
public void setNumberOfLocals(int n) { number_of_locals = n; }
public int getNumberOfLocals() { return number_of_locals; }
public void setTypesOfLocals(StackMapType[] t) { types_of_locals = t; }
public StackMapType[] getTypesOfLocals() { return types_of_locals; }
public void setNumberOfStackItems(int n) { number_of_stack_items = n; }
public int getNumberOfStackItems() { return number_of_stack_items; }
public void setTypesOfStackItems(StackMapType[] t) { types_of_stack_items = t; }
public StackMapType[] getTypesOfStackItems() { return types_of_stack_items; }
/**
* @return deep copy of this object
*/
public StackMapEntry copy() {
try {
return (StackMapEntry)clone();
} catch(CloneNotSupportedException e) {}
return null;
}
/**
* 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
*/
public void accept(Visitor v) {
v.visitStackMapEntry(this);
}
/**
* @return Constant pool used by this object.
*/
public final ConstantPool getConstantPool() { return constant_pool; }
/**
* @param constant_pool Constant pool to be used for this object.
*/
public final void setConstantPool(ConstantPool constant_pool) {
this.constant_pool = constant_pool;
}
}
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