internal void LazyEmitUnboxSpecial(Type type)
{
BoxExpr box = PeekStack() as BoxExpr;
if (box != null)
{
PopStack();
// the unbox and lazy box cancel each other out
PushStackMayBeNull(box.Expr);
}
else
{
// NOTE if the reference is null, we treat it as a default instance of the value type.
Emit(OpCodes.Dup);
CodeEmitterLabel label1 = DefineLabel();
Emit(OpCodes.Brtrue_S, label1);
Emit(OpCodes.Pop);
Emit(OpCodes.Ldloc, DeclareLocal(type));
CodeEmitterLabel label2 = DefineLabel();
Emit(OpCodes.Br_S, label2);
MarkLabel(label1);
Emit(OpCodes.Unbox, type);
Emit(OpCodes.Ldobj, type);
MarkLabel(label2);
}
}
internal void LazyEmitUnbox(Type type)
{
BoxExpr box = PeekStack() as BoxExpr;
if (box != null)
{
PopStack();
PushStack(new BoxUnboxExpr(box.Expr, type));
}
else
{
PushStack(new UnboxExpr(PopStack(), type));
}
}
