[lldb-dev] ObjC decl string checks in Expr Eval?

[Greg Clayton]

We would be happy to accept a patch that disables these ObjC specific checks if ObjC it isn't enabled for a platform or process.

On Mar 7, 2014, at 2:00 AM, Colin Riley <colin at codeplay.com> wrote:

> Yeah, I saw there are also checks in SymbolFileDWARF.cpp for "id", "Class" and "SEL" but at least those are behind ObjC language checks.
> 
> The platform we're running on doesn't support ObjC. From what I can see these checks in ClangASTSource do no language checking so are applied to everything regardless.
> 
> Colin
> 
> On 06/03/2014 23:07, Greg Clayton wrote:
>> What Jim said was true, but I believe it goes a bit further. If we are asked to lookup "id" or "Class", we will find something in the DWARF which will cause a type to be created which isn't compatible with the internally defined "id" and "Class" that the compiler knows about for Objective C. Then this causes problems evaluating expressions...
>> 
>> What platform are you running your expressions on? We might be able to disable objective C for platforms that don't support it (ObjC should be enabled for anything that is "*-apple-macosx" or "*-apple-ios").
>> 
>> Greg
>> 
>> On Mar 6, 2014, at 8:41 AM, Colin Riley <colin at codeplay.com> wrote:
>> 
>>> Hey folks,
>>> 
>>> I'm interested in the following code in ClangASTSource.cpp - ClangASTSource::FindExternalVisibleDecls(), around line 605.
>>> 
>>> ...
>>>    static ConstString id_name("id");
>>>    static ConstString Class_name("Class");
>>> 
>>>    if (name == id_name || name == Class_name)
>>>        return;
>>> ...
>>> 
>>> Is this a legacy bit of ObjC early exit magic? I've been wondering why expression evaluation was failing only ever on variables called 'id' ;) I don't have the ability to validate implications of removal of the code on ObjC. Any opinions on whether this is actually still needed?
>>> 
>>> Colin
>>> 
>>> -- 
>>> Colin Riley
>>> 
>>> Codeplay Software Ltd
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>>> 
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> 
> 
> -- 
> Colin Riley
> 
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