override protected void ParseExceptionHandlerEntry(bool smallSection) {
int dataSize = this.reader.tables.GetByte();
int n = (int)(ushort)this.reader.tables.GetInt16();
if (smallSection)
n = dataSize / 12;
else
n = (dataSize + (n << 8)) / 24;
for (int i = 0; i < n; i++) {
int flags, tryOffset, tryLength, handlerOffset, handlerLength, tokenOrOffset;
if (smallSection) {
flags = this.reader.tables.GetInt16();
tryOffset = this.reader.tables.GetUInt16();
tryLength = this.reader.tables.GetByte();
handlerOffset = this.reader.tables.GetUInt16();
handlerLength = this.reader.tables.GetByte();
}
else {
flags = this.reader.tables.GetInt32();
tryOffset = this.reader.tables.GetInt32();
tryLength = this.reader.tables.GetInt32();
handlerOffset = this.reader.tables.GetInt32();
handlerLength = this.reader.tables.GetInt32();
}
tokenOrOffset = this.reader.tables.GetInt32();
Block tryStartBlock = Reader.GetOrCreateBlock(this.blockMap, tryOffset);
Block blockAfterTryEnd = Reader.GetOrCreateBlock(this.blockMap, tryOffset + tryLength);
Block handlerStartBlock = Reader.GetOrCreateBlock(this.blockMap, handlerOffset);
Block blockAfterHandlerEnd = Reader.GetOrCreateBlock(this.blockMap, handlerOffset + handlerLength);
List<TryNode> tryList = null;
if (!this.tryMap.TryGetValue(tryStartBlock, out tryList)) {
this.tryMap[tryStartBlock] = tryList = new List<TryNode>();
}
TryNode currentTry = null;
int tryEnd = tryOffset + tryLength;
foreach (TryNode t in tryList) {
if (t.tryEnd == tryEnd) {
currentTry = t;
break;
}
}
if (currentTry == null) {
currentTry = new TryNode();
currentTry.tryEnd = tryEnd;
tryList.Add(currentTry);
}
int handlerEnd = handlerOffset + handlerLength;
if (currentTry.handlersEnd < handlerEnd)
currentTry.handlersEnd = handlerEnd;
Debug.Assert((int)flags != 3);
Debug.Assert((int)flags < 5);
switch (flags) {
case 0x00:
// for a catch handler, tokenOrOffset represents
// the metadata token of the handler type. handlerOffset
// is the literal offset for the catch block
int pos = this.reader.tables.GetCurrentPosition();
TypeNode filterType = (TypeNode)this.reader.GetMemberFromToken(tokenOrOffset);
this.reader.tables.SetCurrentPosition(pos);
string variableName = "$exception" + this.handlerMap.Count.ToString(CultureInfo.InvariantCulture);
StackVariable exception = new StackVariable(filterType, variableName);
CatchNode c = new CatchNode(handlerStartBlock, exception, filterType);
c.handlerEnd = handlerEnd;
currentTry.Catchers.Add(c);
this.handlerMap[handlerOffset] = exception;
break;
case 0x01:
// for a filter, tokenOrOffset represents the IL offset
// of the filter block. handlerOffset represents
// the IL offset of the associated catch handler
Block filterExpression = Reader.GetOrCreateBlock(blockMap, tokenOrOffset);
variableName = "$exception" + this.handlerMap.Count.ToString(CultureInfo.InvariantCulture);
exception = new StackVariable(CoreSystemTypes.Object, variableName);
Filter filter = new Filter(filterExpression, exception);
filter.handlerEnd = handlerOffset;
c = new CatchNode(handlerStartBlock, exception, null, filter);
c.handlerEnd = handlerEnd;
currentTry.Catchers.Add(c);
// note that handlerOffset would not be correct here!
this.handlerMap[tokenOrOffset] = exception;
break;
case 0x02:
FinallyNode f = new FinallyNode(handlerStartBlock);
f.handlerEnd = handlerEnd;
currentTry.Finally = f;
break;
case 0x04:
FaultHandler fh = new FaultHandler(handlerStartBlock);
fh.handlerEnd = handlerEnd;
currentTry.FaultHandler = fh;
break;
}
}
}
public virtual Statement VisitFaultHandler(FaultHandler faultHandler)
{
if (faultHandler == null) return null;
faultHandler.Block = this.VisitBlock(faultHandler.Block);
return faultHandler;
}
public override Statement VisitFaultHandler(FaultHandler faultHandler)
{
throw new NotImplementedException("Node type not yet supported");
}
public override Statement VisitFaultHandler(FaultHandler faultHandler)
{
if (faultHandler == null) return null;
return base.VisitFaultHandler((FaultHandler)faultHandler.Clone());
}
public EventingVisitor(Action<FaultHandler> visitFaultHandler) { VisitedFaultHandler += visitFaultHandler; } public event Action<FaultHandler> VisitedFaultHandler; public override Statement VisitFaultHandler(FaultHandler faultHandler) { if (VisitedFaultHandler != null) VisitedFaultHandler(faultHandler); return base.VisitFaultHandler(faultHandler); }
