| /* |
| * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved. |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.sun.org.apache.bcel.internal.classfile; |
| |
| import java.io.DataInput; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import com.sun.org.apache.bcel.internal.Const; |
| |
| /** |
| * This class represents an entry in the exception table of the <em>Code</em> |
| * attribute and is used only there. It contains a range in which a |
| * particular exception handler is active. |
| * |
| * @see Code |
| * @LastModified: Jan 2020 |
| */ |
| public final class CodeException implements Cloneable, Node { |
| |
| private int start_pc; // Range in the code the exception handler is |
| private int end_pc; // active. start_pc is inclusive, end_pc exclusive |
| private int handler_pc; /* Starting address of exception handler, i.e., |
| * an offset from start of code. |
| */ |
| private int catch_type; /* If this is zero the handler catches any |
| * exception, otherwise it points to the |
| * exception class which is to be caught. |
| */ |
| |
| |
| /** |
| * Initialize from another object. |
| */ |
| public CodeException(final CodeException c) { |
| this(c.getStartPC(), c.getEndPC(), c.getHandlerPC(), c.getCatchType()); |
| } |
| |
| |
| /** |
| * Construct object from file stream. |
| * @param file Input stream |
| * @throws IOException |
| */ |
| CodeException(final DataInput file) throws IOException { |
| this(file.readUnsignedShort(), file.readUnsignedShort(), file.readUnsignedShort(), file |
| .readUnsignedShort()); |
| } |
| |
| |
| /** |
| * @param start_pc Range in the code the exception handler is active, |
| * start_pc is inclusive while |
| * @param end_pc is exclusive |
| * @param handler_pc Starting address of exception handler, i.e., |
| * an offset from start of code. |
| * @param catch_type If zero the handler catches any |
| * exception, otherwise it points to the exception class which is |
| * to be caught. |
| */ |
| public CodeException(final int start_pc, final int end_pc, final int handler_pc, final int catch_type) { |
| this.start_pc = start_pc; |
| this.end_pc = end_pc; |
| this.handler_pc = handler_pc; |
| this.catch_type = catch_type; |
| } |
| |
| |
| /** |
| * 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( final Visitor v ) { |
| v.visitCodeException(this); |
| } |
| |
| |
| /** |
| * Dump code exception to file stream in binary format. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| public void dump( final DataOutputStream file ) throws IOException { |
| file.writeShort(start_pc); |
| file.writeShort(end_pc); |
| file.writeShort(handler_pc); |
| file.writeShort(catch_type); |
| } |
| |
| |
| /** |
| * @return 0, if the handler catches any exception, otherwise it points to |
| * the exception class which is to be caught. |
| */ |
| public int getCatchType() { |
| return catch_type; |
| } |
| |
| |
| /** |
| * @return Exclusive end index of the region where the handler is active. |
| */ |
| public int getEndPC() { |
| return end_pc; |
| } |
| |
| |
| /** |
| * @return Starting address of exception handler, relative to the code. |
| */ |
| public int getHandlerPC() { |
| return handler_pc; |
| } |
| |
| |
| /** |
| * @return Inclusive start index of the region where the handler is active. |
| */ |
| public int getStartPC() { |
| return start_pc; |
| } |
| |
| |
| /** |
| * @param catch_type the type of exception that is caught |
| */ |
| public void setCatchType( final int catch_type ) { |
| this.catch_type = catch_type; |
| } |
| |
| |
| /** |
| * @param end_pc end of handled block |
| */ |
| public void setEndPC( final int end_pc ) { |
| this.end_pc = end_pc; |
| } |
| |
| |
| /** |
| * @param handler_pc where the actual code is |
| */ |
| public void setHandlerPC( final int handler_pc ) { // TODO unused |
| this.handler_pc = handler_pc; |
| } |
| |
| |
| /** |
| * @param start_pc start of handled block |
| */ |
| public void setStartPC( final int start_pc ) { // TODO unused |
| this.start_pc = start_pc; |
| } |
| |
| |
| /** |
| * @return String representation. |
| */ |
| @Override |
| public String toString() { |
| return "CodeException(start_pc = " + start_pc + ", end_pc = " + end_pc + ", handler_pc = " |
| + handler_pc + ", catch_type = " + catch_type + ")"; |
| } |
| |
| |
| /** |
| * @return String representation. |
| */ |
| public String toString( final ConstantPool cp, final boolean verbose ) { |
| String str; |
| if (catch_type == 0) { |
| str = "<Any exception>(0)"; |
| } else { |
| str = Utility.compactClassName(cp.getConstantString(catch_type, Const.CONSTANT_Class), false) |
| + (verbose ? "(" + catch_type + ")" : ""); |
| } |
| return start_pc + "\t" + end_pc + "\t" + handler_pc + "\t" + str; |
| } |
| |
| |
| public String toString( final ConstantPool cp ) { |
| return toString(cp, true); |
| } |
| |
| |
| /** |
| * @return deep copy of this object |
| */ |
| public CodeException copy() { |
| try { |
| return (CodeException) clone(); |
| } catch (final CloneNotSupportedException e) { |
| // TODO should this throw? |
| } |
| return null; |
| } |
| } |