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/*
Description: Support for recursive C++ exception handling
compatible with Qt qApp->processEvents()
See exception_manager.txt for details.
Author: Marco Costalba (C) 2005-2007
Copyright: See COPYING file that comes with this distribution
*/
#include <QList>
#include "exceptionmanager.h"
ExceptionManager::ExceptionManager() {
excpId = regionId = currentRegionId = 1;
descriptions.append("we start from 1");
}
void ExceptionManager::init(int* excp, const QString& desc) {
*excp = excpId++;
descriptions.append(desc);
}
const QString ExceptionManager::desc(int excpId) {
return descriptions[excpId];
}
bool ExceptionManager::isMatch(int value, int excp, const QString& context) {
bool match = (value == excp);
if (match) {
QString info("Caught exception \'" + descriptions[excp] +
"\' while in " + context);
qDebug("%s", info.toLatin1().constData());
}
return match;
}
void ExceptionManager::add(int excpId, bool verbose) {
// add a new exception in currentThrowableSet
// are prepended so to use a for loop starting
// from begin to find the latest. Exceptions are
// always added/removed from both totalThrowableSet
// and regionThrowableSet
totalThrowableSet.prepend(Exception(excpId, verbose));
regionThrowableSet.prepend(Exception(excpId, verbose));
}
void ExceptionManager::remove(int excpId) {
// removes ONE exception in totalThrowableSet and ONE in regionThrowableSet.
// if add and remove calls are correctly nested the removed
// excp should be the first in both throwable sets
if (totalThrowableSet.isEmpty() || regionThrowableSet.isEmpty()) {
qDebug("ASSERT in remove: removing %i from an empty set", excpId);
return;
}
// remove from region.
SetIt itReg(regionThrowableSet.begin());
if ((*itReg).excpId != excpId) {
qDebug("ASSERT in remove: %i is not the first in list", excpId);
return;
}
regionThrowableSet.erase(itReg);
// remove from total.
SetIt itTot(totalThrowableSet.begin());
if ((*itTot).excpId != excpId) {
qDebug("ASSERT in remove: %i is not the first in list", excpId);
return;
}
totalThrowableSet.erase(itTot);
}
ExceptionManager::SetIt ExceptionManager::findExcp(ThrowableSet& ts,
const SetIt& startIt, int excpId) {
SetIt it(startIt);
for ( ; it != ts.end(); ++it)
if ((*it).excpId == excpId)
break;
return it;
}
void ExceptionManager::setRaisedFlag(ThrowableSet& ts, int excpId) {
SetIt it(findExcp(ts, ts.begin(), excpId));
while (it != ts.end()) {
(*it).isRaised = true;
it = findExcp(ts, ++it, excpId);
}
}
void ExceptionManager::raise(int excpId) {
if (totalThrowableSet.isEmpty())
return;
// check totalThrowableSet to find if excpId is throwable
SetIt it = findExcp(totalThrowableSet, totalThrowableSet.begin(), excpId);
if (it == totalThrowableSet.end())
return;
// we have found an exception. Set raised flag in regionThrowableSet
setRaisedFlag(regionThrowableSet, excpId);
// then set the flag in all regions throwableSetList
QMap<int, ThrowableSet>::iterator itList(throwableSetMap.begin());
while (itList != throwableSetMap.end()) {
setRaisedFlag(*itList, excpId);
++itList;
}
}
int ExceptionManager::saveThrowableSet() {
// here we save regionThrowableSet _and_ update the region.
// regionThrowableSet is saved with the current region index.
// then current region is changed to a new and never used index
int oldCurrentRegionId = currentRegionId;
throwableSetMap.insert(currentRegionId, regionThrowableSet);
currentRegionId = ++regionId;
// we use this call to trigger a region boundary crossing
// so we have to clear the new region throwables. We still
// have totalThrowableSet to catch any request.
regionThrowableSet.clear();
return oldCurrentRegionId;
}
void ExceptionManager::restoreThrowableSet(int regionId) {
if (!throwableSetMap.contains(regionId)) {
qDebug("ASSERT in restoreThrowableSet: region %i not found", regionId);
return;
}
regionThrowableSet = throwableSetMap[regionId];
throwableSetMap.remove(regionId);
}
bool ExceptionManager::isPending(int excpId) {
// check in ALL regions if an exception request is pending
QMap<int, ThrowableSet>::const_iterator itList(throwableSetMap.constBegin());
while (itList != throwableSetMap.constEnd()) {
ThrowableSet::const_iterator it((*itList).constBegin());
for ( ; it != (*itList).constEnd(); ++it)
if ((*it).isRaised && (*it).excpId == excpId)
return true;
++itList;
}
return false;
}
void ExceptionManager::throwPending() {
if (regionThrowableSet.isEmpty())
return;
ThrowableSet::const_iterator it(regionThrowableSet.constBegin());
for ( ; it != regionThrowableSet.constEnd(); ++it)
if ((*it).isRaised)
break;
if (it == regionThrowableSet.constEnd())
return;
int excpToThrow = (*it).excpId;
if ((*it).verbose)
qDebug("Thrown exception \'%s\'", desc(excpToThrow).toLatin1().constData());
throw excpToThrow;
}
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