[cfe-dev] Message send to super
clattner at apple.com
Sun May 4 14:30:26 PDT 2008
On May 2, 2008, at 5:15 PM, David Chisnall wrote:
> It appears that, in generating the AST, the following expression:
> [super msg];
> is being translated to:
> [(superclass*)self msg];
This is bad. 'super' 'self' '_cmd' as well as 'this' in C++ etc
should all be handled with PreDefinedExpr, just like __func__ is.
> Running clang -ast-print confirms this. These two expressions have
> completely different semantics in Objective-C, and since there appears
> to be no way of determining whether the user actually performed a cast
> on self (which is uncommon, but does happen in real code) or sent a
> message to super (which happens a lot more frequently).
Right. Use of PreDefinedExpr would be be much more explicit and
better in general for clients.
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