public override void VisitTryStatement(TryStatementSyntax node)
{
if (debug)
{
Console.WriteLine(node.ToFullString());
}
var nl = OurLine.NewLine(LineKind.Decl, "TryStatement");
if (node.Finally != null)
{
OurLine.AddEssentialInfo(ref nl, "finally:" + node.Finally.ToString());
}
if (node.Catches != null)
{
OurLine.AddEssentialInfo(ref nl, "catches:" + node.Catches.ToString());
}
// we get the details later on.
nl.Source = node.ToFullString();
nl.ParentKind = node.Parent.RawKind;
nl.RawKind = node.RawKind;
LogCommand(nl);
StartBlock("TryStatement");
base.VisitTryStatement(node);
EndBlock("TryStatement");
}
private void TryStatement(TryStatementSyntax statement)
{
if (statement.Finally != null)
{
throw new NotSupportedException("Finally blocks not supported: " + statement.ToFullString());
}
if (statement.Catches == null || statement.Catches.Count == 0)
{
throw new NotSupportedException("No catach block after try: " + statement.ToFullString());
}
// add special locals
StartTryBlock(out string jmpBuffLast, out string jmpBuff, out string isJmp);
++tryCatchNestingLevel;
// write try
writer.WriteLinePrefix("/* try */");
writer.WriteLinePrefix($"memcpy({jmpBuffLast}, CS2X_ThreadExceptionJmpBuff, sizeof(jmp_buf));");
writer.WriteLinePrefix($"{isJmp} = setjmp({jmpBuff});");
writer.WriteLinePrefix($"if ({isJmp} == 0)");
void WriteTryStart()
{
writer.WriteLinePrefix($"memcpy(CS2X_ThreadExceptionJmpBuff, {jmpBuff}, sizeof(jmp_buf));");
}
BlockStartCallback = WriteTryStart;
WriteStatement(statement.Block);
// write catches
writer.WriteLinePrefix("else /* end try */");
writer.WriteLinePrefix('{');
writer.AddTab();
writer.WriteLinePrefix($"memcpy(CS2X_ThreadExceptionJmpBuff, {jmpBuffLast}, sizeof(jmp_buf));");
var first = statement.Catches.FirstOrDefault();
foreach (var c in statement.Catches)
{
if (c.Filter != null)
{
throw new NotSupportedException("Catch blocks do not support filters: " + c.ToFullString());
}
if (c.Declaration != null)
{
var type = ResolveType(c.Declaration.Type);
writer.WritePrefix();
if (c != first)
{
writer.Write("else ");
}
writer.WriteLine($"if (CS2X_IsType((({GetTypeFullName(specialTypes.objectType)}*)CS2X_ThreadExceptionObject)->CS2X_RuntimeType, &{GetRuntimeTypeObjFullName(type)})) /* catch */");
}
else
{
writer.WriteLinePrefix("/* empty catch */");
}
void WriteCatchStart()
{
if (c.Declaration != null)
{
var type = ResolveType(c.Declaration.Type);
var local = TryAddLocal(c.Declaration.Identifier.ValueText, type);
writer.WriteLinePrefix($"{local.name} = CS2X_ThreadExceptionObject;");
}
writer.WriteLinePrefix("CS2X_ThreadExceptionObject = 0;");
}
BlockStartCallback = WriteCatchStart;
WriteStatement(c.Block);
}
writer.WriteLinePrefix("if (CS2X_ThreadExceptionObject != 0) longjmp(CS2X_ThreadExceptionJmpBuff, 1); /* throw unhandled exception */");
writer.RemoveTab();
writer.WriteLinePrefix('}');
writer.WriteLinePrefix($"memcpy(CS2X_ThreadExceptionJmpBuff, {jmpBuffLast}, sizeof(jmp_buf));");
writer.WriteLinePrefix("/* end catch */");
--tryCatchNestingLevel;
}