/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * 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

 * 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.

 */

package jdk.internal.org.objectweb.asm;

/**

 * Information about an exception handler block.

 *

 * @author Eric Bruneton

 */

class Handler {

    /**

     * Beginning of the exception handler's scope (inclusive).

     */

    Label start;

    /**

     * End of the exception handler's scope (exclusive).

     */

    Label end;

    /**

     * Beginning of the exception handler's code.

     */

    Label handler;

    /**

     * Internal name of the type of exceptions handled by this handler, or

     * <tt>null</tt> to catch any exceptions.

     */

    String desc;

    /**

     * Constant pool index of the internal name of the type of exceptions

     * handled by this handler, or 0 to catch any exceptions.

     */

    int type;

    /**

     * Next exception handler block info.

     */

    Handler next;

    /**

     * Removes the range between start and end from the given exception

     * handlers.

     *

     * @param h

     *            an exception handler list.

     * @param start

     *            the start of the range to be removed.

     * @param end

     *            the end of the range to be removed. Maybe null.

     * @return the exception handler list with the start-end range removed.

     */

    static Handler remove(Handler h, Label start, Label end) {

        if (h == null) {

            return null;

        } else {

            h.next = remove(h.next, start, end);

        }

        int hstart = h.start.position;

        int hend = h.end.position;

        int s = start.position;

        int e = end == null ? Integer.MAX_VALUE : end.position;

        // if [hstart,hend[ and [s,e[ intervals intersect...

        if (s < hend && e > hstart) {

            if (s <= hstart) {

                if (e >= hend) {

                    // [hstart,hend[ fully included in [s,e[, h removed

                    h = h.next;

                } else {

                    // [hstart,hend[ minus [s,e[ = [e,hend[

                    h.start = end;

                }

            } else if (e >= hend) {

                // [hstart,hend[ minus [s,e[ = [hstart,s[

                h.end = start;

            } else {

                // [hstart,hend[ minus [s,e[ = [hstart,s[ + [e,hend[

                Handler g = new Handler();

                g.start = end;

                g.end = h.end;

                g.handler = h.handler;

                g.desc = h.desc;

                g.type = h.type;

                g.next = h.next;

                h.end = start;

                h.next = g;

            }

        }

        return h;

    }

}