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213 lines
7.6 KiB
213 lines
7.6 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.classfile;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import java.io.*;
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/**
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* This class represents a stack map entry recording the types of
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* local variables and the the of stack items at a given byte code offset.
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* See CLDC specification 5.3.1.2
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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* @see StackMap
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* @see StackMapType
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*/
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public final class StackMapEntry implements Cloneable {
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private int byte_code_offset;
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private int number_of_locals;
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private StackMapType[] types_of_locals;
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private int number_of_stack_items;
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private StackMapType[] types_of_stack_items;
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private ConstantPool constant_pool;
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/**
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* Construct object from file stream.
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* @param file Input stream
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* @throws IOException
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*/
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StackMapEntry(DataInputStream file, ConstantPool constant_pool) throws IOException
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{
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this(file.readShort(), file.readShort(), null, -1, null, constant_pool);
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types_of_locals = new StackMapType[number_of_locals];
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for(int i=0; i < number_of_locals; i++)
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types_of_locals[i] = new StackMapType(file, constant_pool);
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number_of_stack_items = file.readShort();
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types_of_stack_items = new StackMapType[number_of_stack_items];
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for(int i=0; i < number_of_stack_items; i++)
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types_of_stack_items[i] = new StackMapType(file, constant_pool);
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}
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public StackMapEntry(int byte_code_offset, int number_of_locals,
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StackMapType[] types_of_locals,
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int number_of_stack_items,
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StackMapType[] types_of_stack_items,
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ConstantPool constant_pool) {
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this.byte_code_offset = byte_code_offset;
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this.number_of_locals = number_of_locals;
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this.types_of_locals = types_of_locals;
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this.number_of_stack_items = number_of_stack_items;
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this.types_of_stack_items = types_of_stack_items;
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this.constant_pool = constant_pool;
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}
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/**
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* Dump stack map entry
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*
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* @param file Output file stream
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* @throws IOException
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*/
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public final void dump(DataOutputStream file) throws IOException
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{
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file.writeShort(byte_code_offset);
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file.writeShort(number_of_locals);
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for(int i=0; i < number_of_locals; i++)
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types_of_locals[i].dump(file);
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file.writeShort(number_of_stack_items);
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for(int i=0; i < number_of_stack_items; i++)
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types_of_stack_items[i].dump(file);
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}
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/**
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* @return String representation.
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*/
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public final String toString() {
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StringBuffer buf = new StringBuffer("(offset=" + byte_code_offset);
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if(number_of_locals > 0) {
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buf.append(", locals={");
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for(int i=0; i < number_of_locals; i++) {
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buf.append(types_of_locals[i]);
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if(i < number_of_locals - 1)
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buf.append(", ");
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}
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buf.append("}");
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}
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if(number_of_stack_items > 0) {
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buf.append(", stack items={");
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for(int i=0; i < number_of_stack_items; i++) {
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buf.append(types_of_stack_items[i]);
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if(i < number_of_stack_items - 1)
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buf.append(", ");
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}
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buf.append("}");
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}
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buf.append(")");
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return buf.toString();
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}
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public void setByteCodeOffset(int b) { byte_code_offset = b; }
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public int getByteCodeOffset() { return byte_code_offset; }
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public void setNumberOfLocals(int n) { number_of_locals = n; }
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public int getNumberOfLocals() { return number_of_locals; }
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public void setTypesOfLocals(StackMapType[] t) { types_of_locals = t; }
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public StackMapType[] getTypesOfLocals() { return types_of_locals; }
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public void setNumberOfStackItems(int n) { number_of_stack_items = n; }
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public int getNumberOfStackItems() { return number_of_stack_items; }
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public void setTypesOfStackItems(StackMapType[] t) { types_of_stack_items = t; }
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public StackMapType[] getTypesOfStackItems() { return types_of_stack_items; }
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/**
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* @return deep copy of this object
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*/
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public StackMapEntry copy() {
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try {
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return (StackMapEntry)clone();
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} catch(CloneNotSupportedException e) {}
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return null;
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitStackMapEntry(this);
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}
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/**
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* @return Constant pool used by this object.
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*/
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public final ConstantPool getConstantPool() { return constant_pool; }
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/**
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* @param constant_pool Constant pool to be used for this object.
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*/
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public final void setConstantPool(ConstantPool constant_pool) {
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this.constant_pool = constant_pool;
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}
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}
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