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

[Jean-Daniel Dupas]

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.



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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