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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
* 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 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
* null 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;
}
}
