[cfe-dev] Relationship between ObjCPropertyRefExpr and ObjCIvarDecl

[Fariborz Jahanian]

It only sets it for synthesized ivars. Look at Sema::ActOnPropertyImplDecl for details. You can follow
the same logic for looking up the ivar;  starting at if (Synthesize) {...}

- Fariborz

On Mar 16, 2011, at 8:49 AM, Hendrik vP wrote:

> I'm experimenting with clang to do some analyzes and inspections on
> Objective-C-code, or, to be more precise, iPhone-Code.
> Currently, I'm trying to 'guess' the inner-types of enumeratable types, especially for
> NSArrays. For this, I set up a RecursiveASTVisitor and collect all of the variables
> that I am interested in (ObjCIVar, VarDecl, ParmVarDecl). Also, I'm looking into
> statements and declarations where those variables get used. I already got it to
> guess some inner-types by inspecting ObjCForCollection-statments, which is 
> fine.
> Now, I'm doing some specializations for NSMutableArray inside my visitor to get
> some hints from statements like
> [<NSMutableArray> addObject:<variable X>]
> so i can build a relationship between the type of variable X and the inner-type of
> the array. This already works for local declared arrays, but not for ObjCIvars.
> For the moment, I'm stuck with an expression that looks like
> [self.items addObject:item]
> where items is declared as
> 
> 
> @interface Foo : NSObject {
> @private
>   NSMutableArray *items;
> }
> @property(retain) NSMutableArray *items;
> @end 
> 
> @implementation Foo  
> @synthesize items;
> @end
> 
> 
> So, I'm diving into the ObjCMessageExpression and try to get the ObjCIvarDecl.
> For this, I'm catching the instance-receiver, which is a ImplicitCastExpr, get it's
> subExpr and cast it to the ObjCPropertyRefExpr that it is. On this, I'm calling
> getExplicitProperty() and receiving the ObjCPropertyDecl.
> 
> And here's the point that confuses me: when I try to get the ObjCIvarDecl by
> calling getPropertyIvarDecl on the ObjCPropertyDecl, I'm receiving a nullpointer.
> 
> The header of Foo is included and also my compilerinstance reports no errors,
> so i think the configuration of the project itself should be correct. Am I 
> misunderstanding the concept/functionality of the methods I'm using - or is it
> maybe a bug inside clang, that it doesn't set the ObjCIvarDecl properly for
> every ObjCProperetyDecl?
> svn log says that I am using r127573.
> 
> Thanks,
> Hendrik
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