public object Convert(DbgSymbol symbol) // TODO: plumb a CancellationToken through here.
{
if (null == m_currentlyProcessingAddresses)
{
m_currentlyProcessingAddresses = new HashSet <ulong>();
}
if (!m_currentlyProcessingAddresses.Add(symbol.Address)) // TODO: Do we need to worry about enregistered things?
{
LogManager.Trace("Detected re-entrant conversion of type {0}; bailing out.", TypeName);
return(null);
}
PowerShell shell;
var lease = DbgProvider.LeaseShell(out shell);
try
{
Util.Assert(null != Context);
Context.Vars["_"] = new PSVariable("_", symbol);
Context.Vars["PSItem"] = new PSVariable("PSItem", symbol);
// Note that StrictMode will be enforced for value converters, because
// they execute in the scope of Debugger.psm1, which sets StrictMode.
//
// The problem with just calling Script.InvokeWithContext directly is that
// non-terminating errors are hidden from us.
shell.AddScript(@"$args[ 0 ].InvokeWithContext( $args[ 1 ].Funcs, $args[ 1 ].VarList )",
true)
.AddArgument(Script)
.AddArgument(Context);
Collection <PSObject> results = shell.Invoke();
// // For some reason, sometimes shell.HadErrors returns true when
// // shell.Streams.Error.Count is 0, when the pipeline is stopping.
// if( Stopping )
// return;
// INT2d518c4b: shell.HadErrors is clueless.
//if( shell.HadErrors )
if (shell.Streams.Error.Count > 0)
{
// TODO TODO: handle more than one
// if( 1 == shell.Streams.Error.Count )
// {
var e = shell.Streams.Error[0];
// TODO: tailored exception
throw new DbgProviderException(Util.Sprintf("Symbol value conversion for type name {0} failed: {1}",
TypeName,
Util.GetExceptionMessages(e.Exception)),
e);
// }
// else
// {
// }
}
if (0 == results.Count)
{
return(null); // I guess it didn't work.
}
if (1 == results.Count)
{
return(results[0]);
}
else
{
// TODO: Hmm... not sure what's the best thing to do here. Return just the
// last thing? For now I'll return the collection.
LogManager.Trace("Warning: Symbol value conversion for type name {0} yielded multiple results (symbol {1}).", TypeName, symbol);
return(results);
}
}
finally
{
m_currentlyProcessingAddresses.Remove(symbol.Address);
if (null != lease)
{
lease.Dispose();
}
// Let's not keep the input object rooted.
Context.Vars.Remove("_");
Context.Vars.Remove("PSItem");
}
} // end Convert()