[cfe-dev] Bug (and patch) in objc method lookup

[steve naroff]

Thanks for the test/fix!

http://llvm.org/viewvc/llvm-project?rev=65526&view=rev

snaroff

On Feb 26, 2009, at 5:22 AM, Jean-Daniel Dupas wrote:

>
> A path to solve a method lookup issue with protocol chain.
> Uses lookupClassMethod()  and lookupInstanceMethod() instead of  
> getClassMethod() and getInstanceMethod() on each declared protocol,  
> so clang will also search in inherited protocol and not just in the  
> leaf protocol.
>
> <protocol-lookup.patch>
>
> A simple example to explain the problem:
>
> -------------------------------- protocol-chain.m  
> --------------------------------
> @protocol ProtocolA
>
> + (id)classMethod;
> - (id)instanceMethod;
>
> @end
>
> @protocol ProtocolB <ProtocolA>
>
> @end
>
> @interface Foo : NSObject <ProtocolB> { }
>
> @end
>
> @interface SubFoo : Foo { }
>
> @end
>
> @implementation SubFoo
>
> + (id)method {
>   return [super classMethod];
> }
>
> - (id)method {
>   return [super instanceMethod];
> }
>
> @end
> ------------------------------------------------------------------------------------------------
> protocol-chain.m:30:10: warning: method '+classMethod' not found  
> (return type defaults to 'id')
>   return [super classMethod];
>          ^~~~~~~~~~~~~~~~~~~
> protocol-chain.m:34:10: warning: method '-instanceMethod' not found  
> (return type defaults to 'id')
>   return [super instanceMethod];
>          ^~~~~~~~~~~~~~~~~~~~~~
> 2 diagnostics generated.
>
>
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