[LLVMdev] A way to pass const char* arg without creating a GlobalVariable

[Dmitry N. Mikushin]

Hi Gordon,

Yes, logically this is impossible. I'd reformulate the question in the following way: how could we change the argument type to be able to pass arrays of the various lengths without global variables? There is a variable length array type - maybe it can help somehow? Or could we create and initialize an AllocInst instead? So, any replacement for global vars would perfectly suite for our case.

- D. 

----- Original message -----
> What memory would the pointer argument point to?
> 
> ― Gordon
> 
> On Nov 20, 2011, at 16:58, "Dmitry N. Mikushin" <maemarcus at gmail.com>
> wrote:
> 
> > Hi,
> > 
> > Is it possible to make up a ConstantArray containing a "const char*"
> > string and pass it directly to the function "char*" argument *without*
> > creating a GlobalVaribable?
> > I looked around and found the usual implementation is
> > array->globalVar->gep. If we omit globalVar & gep, then the argument
> > type would be [ i8 x N ], where N is set to the exact string length,
> > and the expected type is i8* => assertion.
> > In other words, in C we can submit constant value directly to
> > parameter list, e.g. foo("hello"). Is there an equivalent capability
> > in LLVM IR?
> > Our primary targets have limited support for global variables, and it
> > is better to omit them, where possible.
> > 
> > Thanks,
> > - Dima.

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