void BeginCatch(ISehHandlerBlock block, AbcCode code, AbcExceptionHandler e, ref int var, bool dupException, bool catchAnyException)
{
var beginIndex = code.Count;
var catchInfo = new CatchInfo
{
CatchAnyException = catchAnyException
};
bool coerceAny = catchAnyException;
if (var < 0 || catchAnyException)
{
coerceAny = true;
var = SharedExceptionVar;
catchInfo.IsTempVar = true;
}
catchInfo.ExceptionVar = var;
e.LocalVariable = var;
var handlerInfo = block.Tag as SehHandlerInfo;
if (handlerInfo == null)
{
handlerInfo = new SehHandlerInfo {
CatchInfo = catchInfo
};
block.Tag = handlerInfo;
}
else
{
handlerInfo.CatchInfo = catchInfo;
}
//NOTE: we store exception in temp variable to use for rethrow operation
if (dupException && !catchAnyException)
{
code.Dup();
}
if (coerceAny)
{
code.CoerceAnyType();
}
//store exception in variable to use for rethrow operation
code.SetLocal(var);
_resolver.Add(code[beginIndex], new ExceptionTarget(e));
}
void RouteException(AbcCode code, ISehHandlerBlock block, int var)
{
var exceptionType = block.ExceptionType;
if (block.PrevHandler == null)
{
//if err is AVM error then we translate it to System.Exception.
//code.GetLocal(var);
//code.As(AvmTypeCode.Error);
//code.PushNull();
//var ifNotError = code.IfEquals();
code.GetLocal(var);
code.As(SystemTypes.Exception, true);
code.PushNull();
var ifExc = code.IfNotEquals();
code.GetLocal(var);
code.As(AvmTypeCode.Error);
code.PushNull();
var ifNotError = code.IfEquals();
CallToException(code, var);
code.CoerceAnyType();
code.SetLocal(var);
//check my exception
var labelNotError = code.Label();
ifExc.BranchTarget = labelNotError;
ifNotError.BranchTarget = labelNotError;
}
code.GetLocal(var);
var handlerInfo = (SehHandlerInfo)block.Tag;
handlerInfo.CheckExceptionLabel = code.Label();
//NOTE: Exception on stack can be routed from previous handlers
code.SetLocal(var);
code.GetLocal(var);
code.As(exceptionType, true);
code.PushNull();
var ifMyException = code.IfNotEquals();
//Routing to another exception handler or rethrow
//Instruction routing = Label();
if (block.NextHandler == null)
{
code.GetLocal(var);
code.Throw();
}
else
{
code.GetLocal(var);
handlerInfo.JumpToNextHandler = code.Goto();
}
//Normal Execution: Prepare stack for handler
var normal = code.Label();
ifMyException.BranchTarget = normal;
code.GetLocal(var);
code.Coerce(exceptionType, true);
//21 instructions for first handler
//11 instructions for other handlers
}