[cfe-dev] Modifying Structs

[mats petersson via cfe-dev]

On 16 January 2017 at 08:07, Anil Altinay <aaltinay at uci.edu> wrote:

> So there is no way to look up typedef-name in HandleTagDeclDefinition. In
> this case maybe I can use the the name and type of fields of structs to
> identify the relevant structs but I am not sure about this.
>


Yes, that would certainly be one possible scenario.

Obviously, assuming those are reasonably unique and can be used to identify
structs of interest.

--
Mats

>
> On Sun, Jan 15, 2017 at 1:09 AM, mats petersson <mats at planetcatfish.com>
> wrote:
>
>>
>>
>> On 15 January 2017 at 01:49, Anil Altinay <aaltinay at uci.edu> wrote:
>>
>>> Hello Mats,
>>>
>>> I have a list of struct names and I need to change the order of fields
>>> of these structs. I think I can only do this in HandleTagDeclDefinition
>>> because once a struct definition is completed, it is called and the changes
>>> I do here will be applied to rest of the codegen.
>>>
>>
>> Those structs have no name. There is a typedef-name, but the struct has
>> no name.
>>
>> Maybe the trick is to not use a list of struct names, but identify the
>> relevant structures in some other way?
>>
>>>
>>> I can access the name of the struct which is defined using typedef
>>> keyword in HandleTranslationUnit (ASTContext &Ctx) but it is going to be
>>> too late to make changes here. Please let me know if I think wrong.
>>>
>>
>> It _may_ be too late. That depends on what you are actually trying to
>> achieve and how. If you are re-ordering fields, then yes, it'll involve
>> looking up all references to that field and changing it to the new index.
>> Compilers do more difficult things throughout compilation.
>>
>>
>>> Maybe there is a way to get the struct name in HandleTagDeclDefinition
>>> even if it is defined with typedef but I couldn't find it.
>>>
>>
>> There is obviously a typedef name in the compiler, but it's not part of
>> the ASTConsumer interface to "give" that name (as far as I can see). I
>> don't know the answer to how you solve this.
>>
>> --
>> Mats
>>
>>>
>>> thanks,
>>> Anil
>>>
>>> On Sat, Jan 14, 2017 at 2:33 PM, mats petersson <mats at planetcatfish.com>
>>> wrote:
>>>
>>>> Why do you need to know its name? If you edit the actual object, it
>>>> should reflect everywhere it is referred to.
>>>>
>>>> --
>>>> Mats
>>>>
>>>> On 13 January 2017 at 21:47, Anil Altinay via cfe-dev <
>>>> cfe-dev at lists.llvm.org> wrote:
>>>>
>>>>> Actually, HandleTagDeclDefinition is called for Integer struct but I
>>>>> couldn't get the name of the struct which is "Integer" from TagDecl. Is
>>>>> there any way to do this in HandleTagDeclDefinition function.
>>>>>
>>>>> On Fri, Jan 13, 2017 at 12:22 AM, Anil Altinay <aaltinay at uci.edu>
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I am writing an AST consumer to modify fields of the structs in a C
>>>>>> program and let clang to generate code accordingly. I was modifying
>>>>>> structs in HandleTagDeclDefinition(TagDecl *D) but I realized that
>>>>>> if a struct defined using typedef like below, HandleTagDeclDefinition is
>>>>>> not called after it's definition is completed. Is there any way to solve
>>>>>> this problem? Thank you.
>>>>>>
>>>>>> typedef struct
>>>>>> {
>>>>>>     int a;
>>>>>> } Integer;
>>>>>>
>>>>>> best,
>>>>>> Anil
>>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> cfe-dev mailing list
>>>>> cfe-dev at lists.llvm.org
>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>>>>
>>>>>
>>>>
>>>
>>
>
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