[LLVMdev] Text or Data symbol

[Damien Vincent]

In fact, my initial idea was to use "dyn_cast<GlobalAlias>(GV)", but I
didn't use the resulting pointer (except for testing if the pointer is
null). That's why I used classof... but I forgot about the existence of
isa<>.

Thank you for this clarification,

Damien



On Mon, Mar 21, 2011 at 12:08 PM, John Criswell <criswell at illinois.edu>wrote:

>  On 3/21/11 2:00 PM, Damien Vincent wrote:
>
> I reply to myself... I didn't go in the right direction in my previous
> email.
>
> There is an easy way to tell if a GlobalValue corresponds to data or code:
> const GlobalValue *GV;
> if(Function::classof(GV))
>    ... // process the global value as a function
> else
>   ... // process the global value as data
>
>   Damien
>
>
> You should be able to use isa<Function>(GV) to determine if GV is a
> function.  You may have to put in an additional check to see if GV is a
> GlobalAlias and to determine if the GlobalAlias is an alias for a function:
>
> if (GlobalAlias * GA = dyn_cast<GlobalAlias>(GV)) {
>     ... Check to see if GA is an alias for a function
> }
>
> I recommend looking at the doxygen documentation on llvm.org to learn the
> class hierarchy relationships between GlobalValue, GlobalVariable,
> GlobalAlias, and Function.  You should also read the Programmer's Guide to
> get familiar with the isa<>() and dyn_cast<>() functions if you are not
> familiar with them already.
>
> -- John T.
>
>
>
>
>
>
> On Fri, Mar 18, 2011 at 3:16 PM, Damien Vincent <damien.llvm at gmail.com>wrote:
>
>>
>> I am again calling for help from LLVM developers ;)
>>
>> For my DSP backend, at the lowering stage and also at the AsmPrinter
>> stage, I need to know if a GlobalAddress is a code or a data address.
>>
>> So I tried at the lowering stage to use:
>> GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
>> const GlobalValue *GV = GSDN->getGlobal();
>> GV->hasSection()  and  GV->getSection()
>> But the section is not set at this stage (hasSection = false)
>>
>> And at the AsmPrinter stage:
>> const GlobalValue *GV = MO.getGlobal();
>> SectionKind sectionKind = Mang->getSymbol(GV)->getSection().getKind();
>> But again the section does not seem to be set (sectionKind.isInSection() =
>> false)
>>
>> Do you know a way to tell if a global address corresponds to data or code
>> ? I have to process differently text and data address...
>>
>>   Thank you !
>>
>>   Damien
>>
>>
>
>
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