[cfe-users] using Clang for runtime compilation of a class

Georg Bartels via cfe-users cfe-users at lists.llvm.org
Sat Oct 3 00:30:39 PDT 2015


Dear Clang Users,

I have a particular programming problem, and several discussion forums 
suggested Clang as a possible solution. Being totally new to Clang and 
its community, is this the right place to ask questions about how to use 
Clang for a particular programming task? If not, where should I turn to?

In case this is the right forum for such questions, I continue 
describing my problem. Basically, I want to compile a class which 
inherits from a virtual interface class at runtime of my program. The 
program should then create an instance of this new class and use it 
through its interface.

Let me quickly sketch an example. The static version of my program would 
look like this:

class Base
{
   public:
     virtual int calc() const;
};

class Derived: public Base
{
   public:
     virtual int calc() const
     {
       return 42;
     }
};

int main()
{
     std::cout << Derived().calc() << std::endl;
     return 0;
}


The dynamic version (with two fuzzy lines of code) shall look like this:

class Base
{
   public:
     virtual void calc() const;
};

int main()
{
   std::string code = read_derived_code();

   // two fuzzy lines for which I am looking for a solution
   SomeCompiledObjectClass o = compile(code);
   Base* d = SomeFactoryClass(o).createInstance();

   std::cout << d->calc() << std::endl;
   return 0;
}

Is Clang the right tool for solving my two fuzzy lines of code? If yes, 
which class should have a look at? If not, do you maybe know about 
another library/compile which can achieve this task?

Thanks a lot for your help!

Cheers,
Georg.



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