// YieldStatement
private Statement Rewrite(YieldStatement node)
{
Expression expression = RewriteExpressionFreeTemps(node.Expression);
// Yield needs empty stack too, so rewrite it always
return(Ast.Yield(node.Span, expression));
}
// YieldStatement
private void DefaultWalk(YieldStatement node)
{
if (Walk(node))
{
WalkNode(node.Expression);
}
PostWalk(node);
}
protected internal override void PostWalk(YieldStatement node)
{
// Assign the yield statement index for codegen
int index = _topTargets.Count;
TargetLabel label = new TargetLabel();
node.Target = new YieldTarget(index, label);
foreach (ExceptionBlock eb in _tryBlocks) {
// The exception statement must determine
// the label for the enclosing code to jump to
// to return to the given yield target
label = eb.AddYieldTarget(label, index);
}
// Insert the top target to the top yields
Debug.Assert(_topTargets.Count == index);
_topTargets.Add(new YieldTarget(index, label));
}
protected internal override void PostWalk(YieldStatement node)
{
// Assign the yield statement index for codegen
int index = _topTargets.Count;
TargetLabel label = new TargetLabel();
node.Target = new YieldTarget(index, label);
foreach (ExceptionBlock eb in _tryBlocks)
{
// The exception statement must determine
// the label for the enclosing code to jump to
// to return to the given yield target
label = eb.AddYieldTarget(label, index);
}
// Insert the top target to the top yields
Debug.Assert(_topTargets.Count == index);
_topTargets.Add(new YieldTarget(index, label));
}
protected internal override bool Walk(YieldStatement node)
{
_result.Yield = true;
return(true);
}
// YieldStatement
private void DefaultWalk(YieldStatement node)
{
if (Walk(node)) {
WalkNode(node.Expression);
}
PostWalk(node);
}
protected internal override bool Walk(YieldStatement node)
{
_result.Yield = true;
return true;
}
// YieldStatement
private void Dump(YieldStatement node)
{
Out(".yield ");
WalkNode(node.Expression);
Out(";", Flow.NewLine);
}
// Yield statement triggers rewrite
protected internal override void PostWalk(YieldStatement node)
{
_rewrite = true;
}
// Yield statement triggers rewrite
protected internal override void PostWalk(YieldStatement node) {
_rewrite = true;
}