[cfe-dev] Bug in 'super' parsing (Re: Objective-C tidy up)

David Chisnall theraven at sucs.org
Thu Jun 5 09:09:24 PDT 2008

On 5 Jun 2008, at 16:26, David Chisnall wrote:

> On 4 Jun 2008, at 18:11, Chris Lattner wrote:
>>> Any function in Objective-C can use self and _cmd as identifier
>>> names.  Any occurrence of the 'this' token in a C++ program refers
>>> to an instance of an object with a type defined by the context.
>> Does 'super' in ObjC work the same way?
> Yes.  Objective-C is a pure superset of C, so anything that is valid C
> is valid Objective-C.  Which means my current handling of super is
> wrong...

In fact, handling of super is wrong, but only slightly.  I am testing  
if the identifier is "super" in only if CurMethodDecl is set, so the  
predefined expr is only create inside an objective-c method.  There is  
a bug, however.  I am testing for the identifier using strncmp, which  
means that super_class and other identifiers of this form will be  
treated as being 'super,' which is clearly wrong.

Can someone please change:

     if (SD == 0 && !strncmp(II.getName(), "super", 5)) {


     if (SD == 0 && !strcmp(II.getName(), "super")) {

On lib/Sema/SemaExpr.cpp:102.


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