[LLVMdev] generating instructions with embedded ConstantExprs from within LLVM

[Patrick Meredith]

How is this done?  Everything logical I have tried has failed, here was one attempt:

 Constant *C = (Constant*) ConstantArray::get(inst2string(I));  //fucnction defined elsewhere

//generates a correct Global string
   GlobalVariable *str = new GlobalVariable(C->getType(), true, 
     GlobalValue::InternalLinkage, 
      C,  mkStrName( strNumber++ ), &M);
 

   std::vector<Value*> params;  //params to a CallInst
   std::vector<Value*> indices;  //indices to gep
   indices.push_back((Value*) (ConstantInt::get(Type::IntTy, 0)));
   indices.push_back((Value*) (ConstantInt::get(Type::IntTy, 0)));
   Constant *gep = ConstantExpr::getGetElementPtr( (Constant*) str, indices);
   params.push_back((Value*) gep );

    CallInst *CI = new CallInst(printf, params, std::string(""), I);


  This resulted in a "no such type plane" assertion.  Currently I am doing this as two seperate instructions, which works, but slows down the rest of my pass.

~Patrick
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