llvm dev - Jan 2019 - How to pass arbitrary arguments to runFunctionAsMain?

Hi,
I'm trying to call the function main passing arbitrary parameters. My code
is something like:

Please note that MyInterpreter extends Interpreter

    StringRef filename = argv[1];
    std::unique_ptr<Module> m(parseIRFile(filename, error, context));
    MyInterpreter * v = new MyInterpreter(std::move(m));
    v->finalizeObject();
    errs() << "Done\n";
    Function *main = v->FindFunctionNamed("main");

    errs() << " Function " << main->getName().str()
<< "\n";

    std::vector<std::string> parameters;

    parameters.insert(parameters.begin(), "argv");

    const char* const* envp;
    for (int i=1; i<argc;i++)
        parameters.push_back(argv[i]);

    v->runFunctionAsMain(main, parameters, envp);

Is it correct or should I construct parameters in another way?

Thanks a lot
Alberto
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On Sat, 26 Jan 2019 at 07:44, Alberto Barbaro via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>     const char* const* envp;
>     [...]
>     v->runFunctionAsMain(main, parameters, envp);
envp remains uninitialized here, and runFunctionAsMain appears to
iterate through it until it reaches a nullptr, so that'll probably
crash. I think you want

  const char* const* envp = {nullptr};

Other than that, it looked sensible to me.

Cheers.

Tim.

Hi Tim,
Thanks for your answer. I'll fix the problem with envp now.

I don't know if you have seen my other question but i was doubting of that
code because I cannot get the proper value of argv at runtime using my
Interpreter. I hope this is the problem. Do you think the same?

Thanks again

On Sat, Jan 26, 2019, 08:22 Tim Northover <t.p.northover at gmail.com wrote:
> On Sat, 26 Jan 2019 at 07:44, Alberto Barbaro via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> >     const char* const* envp;
> >     [...]
> >     v->runFunctionAsMain(main, parameters, envp);
>
> envp remains uninitialized here, and runFunctionAsMain appears to
> iterate through it until it reaches a nullptr, so that'll probably
> crash. I think you want
>
>   const char* const* envp = {nullptr};
>
> Other than that, it looked sensible to me.
>
> Cheers.
>
> Tim.
>
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