public virtual Statement VisitFilter(Filter filter)
{
if (filter == null) return null;
filter.Expression = this.VisitExpression(filter.Expression);
filter.Block = this.VisitBlock(filter.Block);
return filter;
}
public override Statement VisitFilter(Filter filter)
{
if (filter == null) return null;
return base.VisitFilter((Filter)filter.Clone());
}
public override Statement VisitFilter(Filter filter)
{
throw new NotImplementedException("Node type not yet supported");
}
/// <summary>
/// Add explicit Catch statements at beginning of each catch handler.
/// If a Catch handler has a next handler that differs from the ExceptionHandler enclosing the handler block, then we split
/// the Catch statement into a separate block.
///
/// Special case for Finally handlers that have been turned into catch handlers by the finally-elimination:
/// - Move the special instruction FINALLYVARPREFIX<n> = pop() to the header.
/// </summary>
private void AddCatchStatements (IEnumerable/*<ExceptionHandler>*/ all_ehs, IList new_blocks) {
if (all_ehs == null) return;
foreach(ExceptionHandler eh in all_ehs) {
switch (eh.HandlerType) {
case NodeType.Catch: {
Block handlerblock = eh.HandlerStartBlock;
Block nexthandler = (Block)e2_next[handlerblock];
Block exnhandler = ExceptionHandler(handlerblock);
Debug.Assert(nexthandler != null);
// put Catch into separate block.
Statement catchStatement = new Catch(null, null, eh.FilterType);
catchStatement.SourceContext = handlerblock.SourceContext;
link_handler_header_statement_to_block(new_blocks, catchStatement,
handlerblock, nexthandler, exnhandler);
break;
}
case NodeType.Filter: {
// insert a Filter instruction at the beginning of filter block
Block handlerblock = eh.HandlerStartBlock;
Block nexthandler = (Block)e2_next[handlerblock];
Block exnhandler = ExceptionHandler(handlerblock);
Debug.Assert(nexthandler != null);
// put Filter into separate block.
Statement filterStatement = new Filter();
filterStatement.SourceContext = handlerblock.SourceContext;
link_handler_header_statement_to_block(new_blocks, filterStatement,
handlerblock, nexthandler, exnhandler);
// Commented out, since we treat filter's differently now.
// insert a Catch all instruction at the beginning of the handler block
// prepend_statement_to_block(
// new Catch(null, null, System.Compiler.SystemTypes.Exception),
// eh.HandlerStartBlock);
break;
}
default:
continue;
}
}
}
public EventingVisitor(Action<Filter> visitFilter) { VisitedFilter += visitFilter; } public event Action<Filter> VisitedFilter; public override Statement VisitFilter(Filter filter) { if (VisitedFilter != null) VisitedFilter(filter); return base.VisitFilter(filter); }
