private static Expression CreateRewrittenTry(TryExpression node, HandlerRewriter rewriter, Expression call)
{
var assignLeaveResult = Expression.Assign(rewriter.LeaveResult, call);
var leaveResultValue = Expression.PropertyOrField(rewriter.LeaveResult, "Value");
//
// 1. Create jump table.
//
var dispatch = rewriter.GetDispatchTable();
//
// 2. Count number of expressions needed in resulting block.
//
var n = (node.Type == typeof(void) ? 0 : 1) + (dispatch != null ? 1 : 0) + 1;
var statements = new Expression[n];
//
// 3. Store result of call in temporary.
//
var i = 0;
statements[i++] = assignLeaveResult;
//
// 4. For non-emptyu dispatch tables, emit the dispatch.
//
if (dispatch != null)
{
statements[i++] = dispatch;
}
//
// 5. For non-null nodes, extract the result.
//
if (node.Type != typeof(void))
{
statements[i++] = Expression.Convert(leaveResultValue, node.Type);
}
//
// 6. Put everything together in a block.
//
var res = Expression.Block(node.Type, new[] { rewriter.LeaveResult }, statements);
return(res);
}
private static Expression CreateRewrittenTry(TryExpression node, HandlerRewriter rewriter, Expression call)
{
var assignLeaveResult = Expression.Assign(rewriter.LeaveResult, call);
var leaveResultValue = Expression.PropertyOrField(rewriter.LeaveResult, "Value");
//
// 1. Create jump table.
//
var dispatch = rewriter.GetDispatchTable();
//
// 2. Count number of expressions needed in resulting block.
//
var n = (node.Type == typeof(void) ? 0 : 1) + (dispatch != null ? 1 : 0) + 1;
var statements = new Expression[n];
//
// 3. Store result of call in temporary.
//
var i = 0;
statements[i++] = assignLeaveResult;
//
// 4. For non-emptyu dispatch tables, emit the dispatch.
//
if (dispatch != null)
{
statements[i++] = dispatch;
}
//
// 5. For non-null nodes, extract the result.
//
if (node.Type != typeof(void))
{
statements[i++] = Expression.Convert(leaveResultValue, node.Type);
}
//
// 6. Put everything together in a block.
//
var res = Expression.Block(node.Type, new[] { rewriter.LeaveResult }, statements);
return res;
}
