org.objectweb.asm.tree.TryCatchBlockNode.java Source code

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Here is the source code for org.objectweb.asm.tree.TryCatchBlockNode.java

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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// 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. Neither the name of the copyright holders nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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package org.objectweb.asm.tree;

import java.util.List;
import org.objectweb.asm.MethodVisitor;

/**
 * A node that represents a try catch block.
 *
 * @author Eric Bruneton
 */
public class TryCatchBlockNode {

    /** The beginning of the exception handler's scope (inclusive). */
    public LabelNode start;

    /** The end of the exception handler's scope (exclusive). */
    public LabelNode end;

    /** The beginning of the exception handler's code. */
    public LabelNode handler;

    /**
     * The internal name of the type of exceptions handled by the handler. May be {@literal null} to
     * catch any exceptions (for "finally" blocks).
     */
    public String type;

    /** The runtime visible type annotations on the exception handler type. May be {@literal null}. */
    public List<TypeAnnotationNode> visibleTypeAnnotations;

    /**
     * The runtime invisible type annotations on the exception handler type. May be {@literal null}.
     */
    public List<TypeAnnotationNode> invisibleTypeAnnotations;

    /**
     * Constructs a new {@link TryCatchBlockNode}.
     *
     * @param start the beginning of the exception handler's scope (inclusive).
     * @param end the end of the exception handler's scope (exclusive).
     * @param handler the beginning of the exception handler's code.
     * @param type the internal name of the type of exceptions handled by the handler, or {@literal
     *     null} to catch any exceptions (for "finally" blocks).
     */
    public TryCatchBlockNode(final LabelNode start, final LabelNode end, final LabelNode handler,
            final String type) {
        this.start = start;
        this.end = end;
        this.handler = handler;
        this.type = type;
    }

    /**
     * Updates the index of this try catch block in the method's list of try catch block nodes. This
     * index maybe stored in the 'target' field of the type annotations of this block.
     *
     * @param index the new index of this try catch block in the method's list of try catch block
     *     nodes.
     */
    public void updateIndex(final int index) {
        int newTypeRef = 0x42000000 | (index << 8);
        if (visibleTypeAnnotations != null) {
            for (int i = 0, n = visibleTypeAnnotations.size(); i < n; ++i) {
                visibleTypeAnnotations.get(i).typeRef = newTypeRef;
            }
        }
        if (invisibleTypeAnnotations != null) {
            for (int i = 0, n = invisibleTypeAnnotations.size(); i < n; ++i) {
                invisibleTypeAnnotations.get(i).typeRef = newTypeRef;
            }
        }
    }

    /**
     * Makes the given visitor visit this try catch block.
     *
     * @param methodVisitor a method visitor.
     */
    public void accept(final MethodVisitor methodVisitor) {
        methodVisitor.visitTryCatchBlock(start.getLabel(), end.getLabel(),
                handler == null ? null : handler.getLabel(), type);
        if (visibleTypeAnnotations != null) {
            for (int i = 0, n = visibleTypeAnnotations.size(); i < n; ++i) {
                TypeAnnotationNode typeAnnotation = visibleTypeAnnotations.get(i);
                typeAnnotation.accept(methodVisitor.visitTryCatchAnnotation(typeAnnotation.typeRef,
                        typeAnnotation.typePath, typeAnnotation.desc, true));
            }
        }
        if (invisibleTypeAnnotations != null) {
            for (int i = 0, n = invisibleTypeAnnotations.size(); i < n; ++i) {
                TypeAnnotationNode typeAnnotation = invisibleTypeAnnotations.get(i);
                typeAnnotation.accept(methodVisitor.visitTryCatchAnnotation(typeAnnotation.typeRef,
                        typeAnnotation.typePath, typeAnnotation.desc, false));
            }
        }
    }
}