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/* *******************************************************************
* Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* PARC initial implementation
* ******************************************************************/
package org.aspectj.weaver.bcel;
import org.aspectj.apache.bcel.generic.InstructionHandle;
import org.aspectj.apache.bcel.generic.InstructionList;
import org.aspectj.weaver.UnresolvedType;
/**
* exceptionRanges are set initially to be low priority. The various setPriority methods should be used accordingly. The priority is
* used when we pack the exception table into a method... the exception table should be sorted from high to low priority. Exceptions
* we generate for advice is either high priority (higher than anything coming from the original method... most kinds of
* non-execution advice) or low priority (lower than anything coming from the original method, for execution advice).
*
*
* ??? This does not account for handler, or any other "statement-level" advice. When such statement level advice happens, we may
* want to go to a float level, so we can set the priority of advice to be lower than anything it encloses, and higher than anything
* enclosing it.
*/
/*
* we're actually using the fact that we're an instruction targeter, for the handler
*/
public final class ExceptionRange extends Range {
private InstructionHandle handler;
private final UnresolvedType exceptionType;
private final int priority;
// ---- initialization
/**
* After this constructor is called, this range is not well situated unless {@link #associateWithTargets} is called
*
* XXX priority should be fixed
*/
public ExceptionRange(InstructionList body, UnresolvedType exceptionType, int priority) {
super(body);
this.exceptionType = exceptionType;
this.priority = priority;
}
/**
* @param insideExisting
*/
public ExceptionRange(InstructionList body, UnresolvedType exceptionType, boolean insideExisting) {
this(body, exceptionType, insideExisting ? Integer.MAX_VALUE : -1);
}
public void associateWithTargets(InstructionHandle start, InstructionHandle end, InstructionHandle handler) {
// assert body.contains(start) && body.contains(end) && body.contains(handler)
this.start = start;
this.end = end;
this.handler = handler;
start.addTargeter(this);
end.addTargeter(this);
handler.addTargeter(this);
}
// ----
public InstructionHandle getHandler() {
return handler;
}
public UnresolvedType getCatchType() {
return exceptionType;
}
public int getPriority() {
return priority;
}
// ---- from object
public String toString() {
String str;
if (exceptionType == null) {
str = "finally";
} else {
str = "catch " + exceptionType;
}
// if (priority >= 0 && priority < Integer.MAX_VALUE) {
// str += " (priority " + priority + ")";
// }
return str;
}
public boolean equals(Object other) {
if (!(other instanceof ExceptionRange))
return false;
ExceptionRange o = (ExceptionRange) other;
return o.getStart() == getStart() && o.getEnd() == getEnd() && o.handler == handler
&& ((o.exceptionType == null) ? (exceptionType == null) : o.exceptionType.equals(exceptionType))
&& o.priority == priority;
}
private volatile int hashCode = 0;
public int hashCode() {
if (hashCode == 0) {
int ret = 17;
ret = 37 * ret + getStart().hashCode();
ret = 37 * ret + getEnd().hashCode();
ret = 37 * ret + handler.hashCode();
ret = 37 * ret + ((exceptionType == null) ? 0 : exceptionType.hashCode());
ret = 37 * ret + priority;
hashCode = ret;
}
return hashCode;
}
public void updateTarget(InstructionHandle oldIh, InstructionHandle newIh, InstructionList newBody) {
super.updateTarget(oldIh, newIh, newBody);
// we're guaranteed that start, end, and handler are distinct instruction handles.
if (oldIh == handler) {
handler = newIh;
}
}
public static boolean isExceptionStart(InstructionHandle ih) {
if (!isRangeHandle(ih))
return false;
Range r = getRange(ih);
if (!(r instanceof ExceptionRange))
return false;
ExceptionRange er = (ExceptionRange) r;
return er.getStart() == ih;
}
public static boolean isExceptionEnd(InstructionHandle ih) {
if (!isRangeHandle(ih))
return false;
Range r = getRange(ih);
if (!(r instanceof ExceptionRange))
return false;
ExceptionRange er = (ExceptionRange) r;
return er.getEnd() == ih;
}
}