[LLVMdev] standalone llvm

[Simon Burton]

On Wed, 12 Apr 2006 23:02:12 -0500 (CDT)
Chris Lattner <sabre at nondot.org> wrote:

> 
> > I'd like to directly create executable code that i can
> > stick in memory somewhere and jump into (call).
> 
> Take a look at the llvm/examples directory.  There are several small 
> programs that create LLVM IR on the fly and JIT compile it.

I'm trying to take assembly and create machine code I can execute.
How close am I ?

Simon.


int main() {
  Module *M = NULL;

  char *AsmString = "; ModuleID = 'test'\n\
\n\
implementation   ; Functions:\n\
\n\
int %add1(int %AnArg) {\n\
EntryBlock:\n\
        %addresult = add int 1, %AnArg          ; <int> [#uses=1]\n\
        ret int %addresult\n\
}\n\
";

  M = ParseAssemblyString(AsmString, NULL);

  ExistingModuleProvider* MP = new ExistingModuleProvider(M);
  ExecutionEngine* EE = ExecutionEngine::create(MP, false);

  std::cout << "We just constructed this LLVM module:\n\n" << *M;

  Function *F = M->getNamedFunction("add1");

  assert(F!=NULL);

  int (*add1)(int);

  add1 = (int (*)(int))EE->getPointerToFunction(F);

  std::cout << "Got:" << add1(55) << "\n"; // <----------- Bombs here <---------------

  return 0;
}



-- 
Simon Burton, B.Sc.
Licensed PO Box 8066
ANU Canberra 2601
Australia
Ph. 61 02 6249 6940
http://arrowtheory.com